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2bf6dfd88c
gecko/layout/base/nsLayoutUtils.cpp
Ryan VanderMeulen 2bf6dfd88c Backed out 6 changesets (bug 982141) for Windows and OSX bustage. CLOSED TREE 
Backed out changeset 16540ab2d2cb (bug 982141)
Backed out changeset 2ad9ce9d904e (bug 982141)
Backed out changeset af219bb49c06 (bug 982141)
Backed out changeset ffe51d96e86e (bug 982141)
Backed out changeset 6642718ad3bb (bug 982141)
Backed out changeset 95b341d26f7b (bug 982141)
2014-04-10 15:27:42 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsLayoutUtils.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/MemoryReporting.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsFrameList.h"
#include "nsGkAtoms.h"
#include "nsIAtom.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSColorUtils.h"
#include "nsView.h"
#include "nsPlaceholderFrame.h"
#include "nsIScrollableFrame.h"
#include "nsIDOMEvent.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsFrameManager.h"
#include "nsBlockFrame.h"
#include "nsBidiPresUtils.h"
#include "imgIContainer.h"
#include "ImageOps.h"
#include "gfxRect.h"
#include "gfxContext.h"
#include "nsRenderingContext.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsCSSRendering.h"
#include "nsThemeConstants.h"
#include "nsPIDOMWindow.h"
#include "nsIDocShell.h"
#include "nsIWidget.h"
#include "gfxMatrix.h"
#include "gfxPoint3D.h"
#include "gfxTypes.h"
#include "nsTArray.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "nsICanvasRenderingContextInternal.h"
#include "gfxPlatform.h"
#include <algorithm>
#include "mozilla/dom/HTMLVideoElement.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/DOMRect.h"
#include "imgIRequest.h"
#include "nsIImageLoadingContent.h"
#include "nsCOMPtr.h"
#include "nsCSSProps.h"
#include "nsListControlFrame.h"
#include "mozilla/dom/Element.h"
#include "nsCanvasFrame.h"
#include "gfxDrawable.h"
#include "gfxUtils.h"
#include "nsDataHashtable.h"
#include "nsTextFrame.h"
#include "nsFontFaceList.h"
#include "nsFontInflationData.h"
#include "nsSVGUtils.h"
#include "SVGTextFrame.h"
#include "nsStyleStructInlines.h"
#include "nsStyleTransformMatrix.h"
#include "nsIFrameInlines.h"
#include "ImageContainer.h"
#include "nsComputedDOMStyle.h"
#include "ActiveLayerTracker.h"
#include "mozilla/gfx/2D.h"
#include "gfx2DGlue.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Preferences.h"
#ifdef MOZ_XUL
#include "nsXULPopupManager.h"
#endif
#include "GeckoProfiler.h"
#include "nsAnimationManager.h"
#include "nsTransitionManager.h"
#include "RestyleManager.h"
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::layers;
using namespace mozilla::layout;
using namespace mozilla::gfx;
using mozilla::image::Angle;
using mozilla::image::Flip;
using mozilla::image::ImageOps;
using mozilla::image::Orientation;
#define GRID_ENABLED_PREF_NAME "layout.css.grid.enabled"
#define STICKY_ENABLED_PREF_NAME "layout.css.sticky.enabled"
#define TEXT_ALIGN_TRUE_ENABLED_PREF_NAME "layout.css.text-align-true-value.enabled"
#ifdef DEBUG
// TODO: remove, see bug 598468.
bool nsLayoutUtils::gPreventAssertInCompareTreePosition = false;
#endif // DEBUG
typedef FrameMetrics::ViewID ViewID;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationEmPerLine;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationMinTwips;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationLineThreshold;
/* static */ int32_t nsLayoutUtils::sFontSizeInflationMappingIntercept;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationMaxRatio;
/* static */ bool nsLayoutUtils::sFontSizeInflationForceEnabled;
/* static */ bool nsLayoutUtils::sFontSizeInflationDisabledInMasterProcess;
/* static */ bool nsLayoutUtils::sInvalidationDebuggingIsEnabled;
/* static */ bool nsLayoutUtils::sCSSVariablesEnabled;
/* static */ bool nsLayoutUtils::sInterruptibleReflowEnabled;
static ViewID sScrollIdCounter = FrameMetrics::START_SCROLL_ID;
typedef nsDataHashtable<nsUint64HashKey, nsIContent*> ContentMap;
static ContentMap* sContentMap = nullptr;
static ContentMap& GetContentMap() {
if (!sContentMap) {
sContentMap = new ContentMap();
}
return *sContentMap;
}
// When the pref "layout.css.grid.enabled" changes, this function is invoked
// to let us update kDisplayKTable, to selectively disable or restore the
// entries for "grid" and "inline-grid" in that table.
static void
GridEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
{
MOZ_ASSERT(strncmp(aPrefName, GRID_ENABLED_PREF_NAME,
ArrayLength(GRID_ENABLED_PREF_NAME)) == 0,
"We only registered this callback for a single pref, so it "
"should only be called for that pref");
static int32_t sIndexOfGridInDisplayTable;
static int32_t sIndexOfInlineGridInDisplayTable;
static bool sAreGridKeywordIndicesInitialized; // initialized to false
bool isGridEnabled =
Preferences::GetBool(GRID_ENABLED_PREF_NAME, false);
if (!sAreGridKeywordIndicesInitialized) {
// First run: find the position of "grid" and "inline-grid" in
// kDisplayKTable.
sIndexOfGridInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_grid,
nsCSSProps::kDisplayKTable);
MOZ_ASSERT(sIndexOfGridInDisplayTable >= 0,
"Couldn't find grid in kDisplayKTable");
sIndexOfInlineGridInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_inline_grid,
nsCSSProps::kDisplayKTable);
MOZ_ASSERT(sIndexOfInlineGridInDisplayTable >= 0,
"Couldn't find inline-grid in kDisplayKTable");
sAreGridKeywordIndicesInitialized = true;
}
// OK -- now, stomp on or restore the "grid" entries in kDisplayKTable,
// depending on whether the grid pref is enabled vs. disabled.
if (sIndexOfGridInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfGridInDisplayTable] =
isGridEnabled ? eCSSKeyword_grid : eCSSKeyword_UNKNOWN;
}
if (sIndexOfInlineGridInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfInlineGridInDisplayTable] =
isGridEnabled ? eCSSKeyword_inline_grid : eCSSKeyword_UNKNOWN;
}
}
// When the pref "layout.css.sticky.enabled" changes, this function is invoked
// to let us update kPositionKTable, to selectively disable or restore the
// entry for "sticky" in that table.
static void
StickyEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
{
MOZ_ASSERT(strncmp(aPrefName, STICKY_ENABLED_PREF_NAME,
ArrayLength(STICKY_ENABLED_PREF_NAME)) == 0,
"We only registered this callback for a single pref, so it "
"should only be called for that pref");
static int32_t sIndexOfStickyInPositionTable;
static bool sIsStickyKeywordIndexInitialized; // initialized to false
bool isStickyEnabled =
Preferences::GetBool(STICKY_ENABLED_PREF_NAME, false);
if (!sIsStickyKeywordIndexInitialized) {
// First run: find the position of "sticky" in kPositionKTable.
sIndexOfStickyInPositionTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_sticky,
nsCSSProps::kPositionKTable);
MOZ_ASSERT(sIndexOfStickyInPositionTable >= 0,
"Couldn't find sticky in kPositionKTable");
sIsStickyKeywordIndexInitialized = true;
}
// OK -- now, stomp on or restore the "sticky" entry in kPositionKTable,
// depending on whether the sticky pref is enabled vs. disabled.
nsCSSProps::kPositionKTable[sIndexOfStickyInPositionTable] =
isStickyEnabled ? eCSSKeyword_sticky : eCSSKeyword_UNKNOWN;
}
// When the pref "layout.css.text-align-true-value.enabled" changes, this
// function is called to let us update kTextAlignKTable & kTextAlignLastKTable,
// to selectively disable or restore the entries for "true" in those tables.
static void
TextAlignTrueEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
{
NS_ASSERTION(strcmp(aPrefName, TEXT_ALIGN_TRUE_ENABLED_PREF_NAME) == 0,
"Did you misspell " TEXT_ALIGN_TRUE_ENABLED_PREF_NAME " ?");
static bool sIsInitialized;
static int32_t sIndexOfTrueInTextAlignTable;
static int32_t sIndexOfTrueInTextAlignLastTable;
bool isTextAlignTrueEnabled =
Preferences::GetBool(TEXT_ALIGN_TRUE_ENABLED_PREF_NAME, false);
if (!sIsInitialized) {
// First run: find the position of "true" in kTextAlignKTable.
sIndexOfTrueInTextAlignTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_true,
nsCSSProps::kTextAlignKTable);
// First run: find the position of "true" in kTextAlignLastKTable.
sIndexOfTrueInTextAlignLastTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_true,
nsCSSProps::kTextAlignLastKTable);
sIsInitialized = true;
}
// OK -- now, stomp on or restore the "true" entry in the keyword tables,
// depending on whether the pref is enabled vs. disabled.
MOZ_ASSERT(sIndexOfTrueInTextAlignTable >= 0);
nsCSSProps::kTextAlignKTable[sIndexOfTrueInTextAlignTable] =
isTextAlignTrueEnabled ? eCSSKeyword_true : eCSSKeyword_UNKNOWN;
MOZ_ASSERT(sIndexOfTrueInTextAlignLastTable >= 0);
nsCSSProps::kTextAlignLastKTable[sIndexOfTrueInTextAlignLastTable] =
isTextAlignTrueEnabled ? eCSSKeyword_true : eCSSKeyword_UNKNOWN;
}
template <class AnimationsOrTransitions>
static AnimationsOrTransitions*
HasAnimationOrTransitionForCompositor(nsIContent* aContent,
nsIAtom* aAnimationProperty,
nsCSSProperty aProperty)
{
AnimationsOrTransitions* animations =
static_cast<AnimationsOrTransitions*>(aContent->GetProperty(aAnimationProperty));
if (animations) {
bool propertyMatches = animations->HasAnimationOfProperty(aProperty);
if (propertyMatches &&
animations->CanPerformOnCompositorThread(
CommonElementAnimationData::CanAnimate_AllowPartial)) {
return animations;
}
}
return nullptr;
}
bool
nsLayoutUtils::HasAnimationsForCompositor(nsIContent* aContent,
nsCSSProperty aProperty)
{
if (!aContent->MayHaveAnimations())
return false;
return HasAnimationOrTransitionForCompositor<ElementAnimations>
(aContent, nsGkAtoms::animationsProperty, aProperty) ||
HasAnimationOrTransitionForCompositor<ElementTransitions>
(aContent, nsGkAtoms::transitionsProperty, aProperty);
}
template <class AnimationsOrTransitions>
AnimationsOrTransitions*
mozilla::HasAnimationOrTransition(nsIContent* aContent,
nsIAtom* aAnimationProperty,
nsCSSProperty aProperty)
{
AnimationsOrTransitions* animations =
static_cast<AnimationsOrTransitions*>(aContent->GetProperty(aAnimationProperty));
if (animations) {
bool propertyMatches = animations->HasAnimationOfProperty(aProperty);
if (propertyMatches) {
return animations;
}
}
return nullptr;
}
template ElementAnimations*
mozilla::HasAnimationOrTransition<ElementAnimations>(nsIContent* aContent,
nsIAtom* aAnimationProperty,
nsCSSProperty aProperty);
template ElementTransitions*
mozilla::HasAnimationOrTransition<ElementTransitions>(nsIContent* aContent,
nsIAtom* aAnimationProperty,
nsCSSProperty aProperty);
bool
nsLayoutUtils::HasAnimations(nsIContent* aContent,
nsCSSProperty aProperty)
{
if (!aContent->MayHaveAnimations())
return false;
return HasAnimationOrTransition<ElementAnimations>
(aContent, nsGkAtoms::animationsProperty, aProperty) ||
HasAnimationOrTransition<ElementTransitions>
(aContent, nsGkAtoms::transitionsProperty, aProperty);
}
static gfxSize
GetScaleForValue(const nsStyleAnimation::Value& aValue,
nsIFrame* aFrame)
{
if (!aFrame) {
NS_WARNING("No frame.");
return gfxSize();
}
if (aValue.GetUnit() != nsStyleAnimation::eUnit_Transform) {
NS_WARNING("Expected a transform.");
return gfxSize();
}
nsCSSValueSharedList* list = aValue.GetCSSValueSharedListValue();
MOZ_ASSERT(list->mHead);
if (list->mHead->mValue.GetUnit() == eCSSUnit_None) {
// There is an animation, but no actual transform yet.
return gfxSize();
}
nsRect frameBounds = aFrame->GetRect();
bool dontCare;
gfx3DMatrix transform = nsStyleTransformMatrix::ReadTransforms(
list->mHead,
aFrame->StyleContext(),
aFrame->PresContext(), dontCare, frameBounds,
aFrame->PresContext()->AppUnitsPerDevPixel());
gfxMatrix transform2d;
bool canDraw2D = transform.CanDraw2D(&transform2d);
if (!canDraw2D) {
return gfxSize();
}
return transform2d.ScaleFactors(true);
}
float
GetSuitableScale(float aMaxScale, float aMinScale)
{
// If the minimum scale >= 1.0f, use it; if the maximum <= 1.0f, use it;
// otherwise use 1.0f.
if (aMinScale >= 1.0f) {
return aMinScale;
}
else if (aMaxScale <= 1.0f) {
return aMaxScale;
}
return 1.0f;
}
gfxSize
nsLayoutUtils::ComputeSuitableScaleForAnimation(nsIContent* aContent)
{
gfxSize maxScale(1.0f, 1.0f);
gfxSize minScale(1.0f, 1.0f);
ElementAnimations* animations = HasAnimationOrTransitionForCompositor<ElementAnimations>
(aContent, nsGkAtoms::animationsProperty, eCSSProperty_transform);
if (animations) {
for (uint32_t animIdx = animations->mAnimations.Length(); animIdx-- != 0; ) {
mozilla::StyleAnimation& anim = animations->mAnimations[animIdx];
for (uint32_t propIdx = anim.mProperties.Length(); propIdx-- != 0; ) {
AnimationProperty& prop = anim.mProperties[propIdx];
if (prop.mProperty == eCSSProperty_transform) {
for (uint32_t segIdx = prop.mSegments.Length(); segIdx-- != 0; ) {
AnimationPropertySegment& segment = prop.mSegments[segIdx];
gfxSize from = GetScaleForValue(segment.mFromValue,
aContent->GetPrimaryFrame());
maxScale.width = std::max<float>(maxScale.width, from.width);
maxScale.height = std::max<float>(maxScale.height, from.height);
minScale.width = std::min<float>(minScale.width, from.width);
minScale.height = std::min<float>(minScale.height, from.height);
gfxSize to = GetScaleForValue(segment.mToValue,
aContent->GetPrimaryFrame());
maxScale.width = std::max<float>(maxScale.width, to.width);
maxScale.height = std::max<float>(maxScale.height, to.height);
minScale.width = std::min<float>(minScale.width, to.width);
minScale.height = std::min<float>(minScale.height, to.height);
}
}
}
}
}
ElementTransitions* transitions = HasAnimationOrTransitionForCompositor<ElementTransitions>
(aContent, nsGkAtoms::transitionsProperty, eCSSProperty_transform);
if (transitions) {
for (uint32_t i = 0, i_end = transitions->mPropertyTransitions.Length();
i < i_end; ++i){
ElementPropertyTransition &pt = transitions->mPropertyTransitions[i];
if (pt.IsRemovedSentinel()) {
continue;
}
MOZ_ASSERT(pt.mProperties.Length() == 1,
"Should have one animation property for a transition");
MOZ_ASSERT(pt.mProperties[0].mSegments.Length() == 1,
"Animation property should have one segment for a transition");
const AnimationPropertySegment& segment = pt.mProperties[0].mSegments[0];
if (pt.mProperties[0].mProperty == eCSSProperty_transform) {
gfxSize start = GetScaleForValue(segment.mFromValue,
aContent->GetPrimaryFrame());
maxScale.width = std::max<float>(maxScale.width, start.width);
maxScale.height = std::max<float>(maxScale.height, start.height);
minScale.width = std::min<float>(minScale.width, start.width);
minScale.height = std::min<float>(minScale.height, start.height);
gfxSize end = GetScaleForValue(segment.mToValue,
aContent->GetPrimaryFrame());
maxScale.width = std::max<float>(maxScale.width, end.width);
maxScale.height = std::max<float>(maxScale.height, end.height);
minScale.width = std::min<float>(minScale.width, end.width);
minScale.height = std::min<float>(minScale.height, end.height);
}
}
}
return gfxSize(GetSuitableScale(maxScale.width, minScale.width),
GetSuitableScale(maxScale.height, minScale.height));
}
bool
nsLayoutUtils::AreAsyncAnimationsEnabled()
{
static bool sAreAsyncAnimationsEnabled;
static bool sAsyncPrefCached = false;
if (!sAsyncPrefCached) {
sAsyncPrefCached = true;
Preferences::AddBoolVarCache(&sAreAsyncAnimationsEnabled,
"layers.offmainthreadcomposition.async-animations");
}
return sAreAsyncAnimationsEnabled &&
gfxPlatform::OffMainThreadCompositingEnabled();
}
bool
nsLayoutUtils::IsAnimationLoggingEnabled()
{
static bool sShouldLog;
static bool sShouldLogPrefCached;
if (!sShouldLogPrefCached) {
sShouldLogPrefCached = true;
Preferences::AddBoolVarCache(&sShouldLog,
"layers.offmainthreadcomposition.log-animations");
}
return sShouldLog;
}
bool
nsLayoutUtils::UseBackgroundNearestFiltering()
{
static bool sUseBackgroundNearestFilteringEnabled;
static bool sUseBackgroundNearestFilteringPrefInitialised = false;
if (!sUseBackgroundNearestFilteringPrefInitialised) {
sUseBackgroundNearestFilteringPrefInitialised = true;
sUseBackgroundNearestFilteringEnabled =
Preferences::GetBool("gfx.filter.nearest.force-enabled", false);
}
return sUseBackgroundNearestFilteringEnabled;
}
bool
nsLayoutUtils::GPUImageScalingEnabled()
{
static bool sGPUImageScalingEnabled;
static bool sGPUImageScalingPrefInitialised = false;
if (!sGPUImageScalingPrefInitialised) {
sGPUImageScalingPrefInitialised = true;
sGPUImageScalingEnabled =
Preferences::GetBool("layout.gpu-image-scaling.enabled", false);
}
return sGPUImageScalingEnabled;
}
bool
nsLayoutUtils::AnimatedImageLayersEnabled()
{
static bool sAnimatedImageLayersEnabled;
static bool sAnimatedImageLayersPrefCached = false;
if (!sAnimatedImageLayersPrefCached) {
sAnimatedImageLayersPrefCached = true;
Preferences::AddBoolVarCache(&sAnimatedImageLayersEnabled,
"layout.animated-image-layers.enabled",
false);
}
return sAnimatedImageLayersEnabled;
}
bool
nsLayoutUtils::CSSFiltersEnabled()
{
static bool sCSSFiltersEnabled;
static bool sCSSFiltersPrefCached = false;
if (!sCSSFiltersPrefCached) {
sCSSFiltersPrefCached = true;
Preferences::AddBoolVarCache(&sCSSFiltersEnabled,
"layout.css.filters.enabled",
false);
}
return sCSSFiltersEnabled;
}
bool
nsLayoutUtils::UnsetValueEnabled()
{
static bool sUnsetValueEnabled;
static bool sUnsetValuePrefCached = false;
if (!sUnsetValuePrefCached) {
sUnsetValuePrefCached = true;
Preferences::AddBoolVarCache(&sUnsetValueEnabled,
"layout.css.unset-value.enabled",
false);
}
return sUnsetValueEnabled;
}
bool
nsLayoutUtils::IsTextAlignTrueValueEnabled()
{
static bool sTextAlignTrueValueEnabled;
static bool sTextAlignTrueValueEnabledPrefCached = false;
if (!sTextAlignTrueValueEnabledPrefCached) {
sTextAlignTrueValueEnabledPrefCached = true;
Preferences::AddBoolVarCache(&sTextAlignTrueValueEnabled,
TEXT_ALIGN_TRUE_ENABLED_PREF_NAME,
false);
}
return sTextAlignTrueValueEnabled;
}
void
nsLayoutUtils::UnionChildOverflow(nsIFrame* aFrame,
nsOverflowAreas& aOverflowAreas)
{
// Iterate over all children except pop-ups.
const nsIFrame::ChildListIDs skip(nsIFrame::kPopupList |
nsIFrame::kSelectPopupList);
for (nsIFrame::ChildListIterator childLists(aFrame);
!childLists.IsDone(); childLists.Next()) {
if (skip.Contains(childLists.CurrentID())) {
continue;
}
nsFrameList children = childLists.CurrentList();
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
nsOverflowAreas childOverflow =
child->GetOverflowAreas() + child->GetPosition();
aOverflowAreas.UnionWith(childOverflow);
}
}
}
static void DestroyViewID(void* aObject, nsIAtom* aPropertyName,
void* aPropertyValue, void* aData)
{
ViewID* id = static_cast<ViewID*>(aPropertyValue);
GetContentMap().Remove(*id);
delete id;
}
/**
* A namespace class for static layout utilities.
*/
bool
nsLayoutUtils::FindIDFor(const nsIContent* aContent, ViewID* aOutViewId)
{
void* scrollIdProperty = aContent->GetProperty(nsGkAtoms::RemoteId);
if (scrollIdProperty) {
*aOutViewId = *static_cast<ViewID*>(scrollIdProperty);
return true;
}
return false;
}
ViewID
nsLayoutUtils::FindOrCreateIDFor(nsIContent* aContent)
{
ViewID scrollId;
if (!FindIDFor(aContent, &scrollId)) {
scrollId = sScrollIdCounter++;
aContent->SetProperty(nsGkAtoms::RemoteId, new ViewID(scrollId),
DestroyViewID);
GetContentMap().Put(scrollId, aContent);
}
return scrollId;
}
nsIContent*
nsLayoutUtils::FindContentFor(ViewID aId)
{
NS_ABORT_IF_FALSE(aId != FrameMetrics::NULL_SCROLL_ID,
"Cannot find a content element in map for null IDs.");
nsIContent* content;
bool exists = GetContentMap().Get(aId, &content);
if (exists) {
return content;
} else {
return nullptr;
}
}
nsIScrollableFrame*
nsLayoutUtils::FindScrollableFrameFor(ViewID aId)
{
nsIContent* content = FindContentFor(aId);
if (!content) {
return nullptr;
}
nsIFrame* scrolledFrame = content->GetPrimaryFrame();
if (scrolledFrame && content->OwnerDoc()->GetRootElement() == content) {
// The content is the root element of a subdocument, so return the root scrollable
// for the subdocument.
scrolledFrame = scrolledFrame->PresContext()->PresShell()->GetRootScrollFrame();
}
return scrolledFrame ? scrolledFrame->GetScrollTargetFrame() : nullptr;
}
bool
nsLayoutUtils::GetDisplayPort(nsIContent* aContent, nsRect *aResult)
{
DisplayPortPropertyData* rectData =
static_cast<DisplayPortPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPort));
DisplayPortMarginsPropertyData* marginsData =
static_cast<DisplayPortMarginsPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPortMargins));
if (!rectData && !marginsData) {
return false;
}
if (aResult) {
if (rectData && marginsData) {
// choose margins if equal priority
if (rectData->mPriority > marginsData->mPriority) {
marginsData = nullptr;
} else {
rectData = nullptr;
}
}
if (rectData) {
*aResult = rectData->mRect;
} else {
nsRect* baseData =
static_cast<nsRect*>(aContent->GetProperty(nsGkAtoms::DisplayPortBase));
nsRect base;
if (baseData) {
base = *baseData;
}
nsIFrame* frame = aContent->GetPrimaryFrame();
if (frame) {
bool isRoot = false;
if (aContent->OwnerDoc()->GetRootElement() == aContent) {
// We want the scroll frame, the root scroll frame differs from all
// others in that the primary frame is not the scroll frame.
frame = frame->PresContext()->PresShell()->GetRootScrollFrame();
isRoot = true;
}
// first convert the base rect to layer pixels
nsPresContext* presContext = frame->PresContext();
int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel();
gfxSize res = presContext->PresShell()->GetCumulativeResolution();
gfxSize parentRes = res;
if (isRoot) {
// the base rect for root scroll frames is specified in the parent document
// coordinate space, so it doesn't include the local resolution.
gfxSize localRes = presContext->PresShell()->GetResolution();
parentRes.width /= localRes.width;
parentRes.height /= localRes.height;
}
LayerRect rect;
rect.x = parentRes.width * NSAppUnitsToFloatPixels(base.x, auPerDevPixel);
rect.y = parentRes.height * NSAppUnitsToFloatPixels(base.y, auPerDevPixel);
rect.width =
parentRes.width * NSAppUnitsToFloatPixels(base.width, auPerDevPixel);
rect.height =
parentRes.height * NSAppUnitsToFloatPixels(base.height, auPerDevPixel);
rect.Inflate(marginsData->mMargins);
nsIScrollableFrame* scrollableFrame = frame->GetScrollTargetFrame();
nsPoint scrollPos(
scrollableFrame ? scrollableFrame->GetScrollPosition() : nsPoint(0,0));
if (marginsData->mAlignmentX > 0 || marginsData->mAlignmentY > 0) {
LayerPoint scrollPosLayer(
res.width * NSAppUnitsToFloatPixels(scrollPos.x, auPerDevPixel),
res.height * NSAppUnitsToFloatPixels(scrollPos.y, auPerDevPixel));
rect += scrollPosLayer;
// Inflate the rectangle by 1 so that we always push to the next tile
// boundary. This is desirable to stop from having a rectangle with a
// moving origin occasionally being smaller when it coincidentally lines
// up to tile boundaries.
rect.Inflate(1);
float left =
marginsData->mAlignmentX * floor(rect.x / marginsData->mAlignmentX);
float top =
marginsData->mAlignmentY * floor(rect.y / marginsData->mAlignmentY);
float right =
marginsData->mAlignmentX * ceil(rect.XMost() / marginsData->mAlignmentX);
float bottom =
marginsData->mAlignmentY * ceil(rect.YMost() / marginsData->mAlignmentY);
rect = LayerRect(left, top, right - left, bottom - top);
rect -= scrollPosLayer;
}
nsRect result;
result.x = NSFloatPixelsToAppUnits(rect.x / res.width, auPerDevPixel);
result.y = NSFloatPixelsToAppUnits(rect.y / res.height, auPerDevPixel);
result.width =
NSFloatPixelsToAppUnits(rect.width / res.width, auPerDevPixel);
result.height =
NSFloatPixelsToAppUnits(rect.height / res.height, auPerDevPixel);
// Finally, clamp the display port to the expanded scrollable rect.
nsRect expandedScrollableRect = CalculateExpandedScrollableRect(frame);
result = expandedScrollableRect.Intersect(result + scrollPos) - scrollPos;
*aResult = result;
}
}
}
return true;
}
void
nsLayoutUtils::SetDisplayPortBase(nsIContent* aContent, const nsRect& aBase)
{
aContent->SetProperty(nsGkAtoms::DisplayPortBase, new nsRect(aBase),
nsINode::DeleteProperty<nsRect>);
}
bool
nsLayoutUtils::GetCriticalDisplayPort(nsIContent* aContent, nsRect* aResult)
{
void* property = aContent->GetProperty(nsGkAtoms::CriticalDisplayPort);
if (!property) {
return false;
}
if (aResult) {
*aResult = *static_cast<nsRect*>(property);
}
return true;
}
nsIFrame*
nsLayoutUtils::LastContinuationWithChild(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
aFrame = aFrame->LastContinuation();
while (!aFrame->GetFirstPrincipalChild() &&
aFrame->GetPrevContinuation()) {
aFrame = aFrame->GetPrevContinuation();
}
return aFrame;
}
/**
* GetFirstChildFrame returns the first "real" child frame of a
* given frame. It will descend down into pseudo-frames (unless the
* pseudo-frame is the :before generated frame).
* @param aFrame the frame
* @param aFrame the frame's content node
*/
static nsIFrame*
GetFirstChildFrame(nsIFrame* aFrame,
nsIContent* aContent)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
// Get the first child frame
nsIFrame* childFrame = aFrame->GetFirstPrincipalChild();
// If the child frame is a pseudo-frame, then return its first child.
// Note that the frame we create for the generated content is also a
// pseudo-frame and so don't drill down in that case
if (childFrame &&
childFrame->IsPseudoFrame(aContent) &&
!childFrame->IsGeneratedContentFrame()) {
return GetFirstChildFrame(childFrame, aContent);
}
return childFrame;
}
/**
* GetLastChildFrame returns the last "real" child frame of a
* given frame. It will descend down into pseudo-frames (unless the
* pseudo-frame is the :after generated frame).
* @param aFrame the frame
* @param aFrame the frame's content node
*/
static nsIFrame*
GetLastChildFrame(nsIFrame* aFrame,
nsIContent* aContent)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
// Get the last continuation frame that's a parent
nsIFrame* lastParentContinuation =
nsLayoutUtils::LastContinuationWithChild(aFrame);
nsIFrame* lastChildFrame =
lastParentContinuation->GetLastChild(nsIFrame::kPrincipalList);
if (lastChildFrame) {
// Get the frame's first continuation. This matters in case the frame has
// been continued across multiple lines or split by BiDi resolution.
lastChildFrame = lastChildFrame->FirstContinuation();
// If the last child frame is a pseudo-frame, then return its last child.
// Note that the frame we create for the generated content is also a
// pseudo-frame and so don't drill down in that case
if (lastChildFrame &&
lastChildFrame->IsPseudoFrame(aContent) &&
!lastChildFrame->IsGeneratedContentFrame()) {
return GetLastChildFrame(lastChildFrame, aContent);
}
return lastChildFrame;
}
return nullptr;
}
//static
FrameChildListID
nsLayoutUtils::GetChildListNameFor(nsIFrame* aChildFrame)
{
nsIFrame::ChildListID id = nsIFrame::kPrincipalList;
if (aChildFrame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
nsIFrame* pif = aChildFrame->GetPrevInFlow();
if (pif->GetParent() == aChildFrame->GetParent()) {
id = nsIFrame::kExcessOverflowContainersList;
}
else {
id = nsIFrame::kOverflowContainersList;
}
}
// See if the frame is moved out of the flow
else if (aChildFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
// Look at the style information to tell
const nsStyleDisplay* disp = aChildFrame->StyleDisplay();
if (NS_STYLE_POSITION_ABSOLUTE == disp->mPosition) {
id = nsIFrame::kAbsoluteList;
} else if (NS_STYLE_POSITION_FIXED == disp->mPosition) {
if (nsLayoutUtils::IsReallyFixedPos(aChildFrame)) {
id = nsIFrame::kFixedList;
} else {
id = nsIFrame::kAbsoluteList;
}
#ifdef MOZ_XUL
} else if (NS_STYLE_DISPLAY_POPUP == disp->mDisplay) {
// Out-of-flows that are DISPLAY_POPUP must be kids of the root popup set
#ifdef DEBUG
nsIFrame* parent = aChildFrame->GetParent();
NS_ASSERTION(parent && parent->GetType() == nsGkAtoms::popupSetFrame,
"Unexpected parent");
#endif // DEBUG
id = nsIFrame::kPopupList;
#endif // MOZ_XUL
} else {
NS_ASSERTION(aChildFrame->IsFloating(), "not a floated frame");
id = nsIFrame::kFloatList;
}
} else {
nsIAtom* childType = aChildFrame->GetType();
if (nsGkAtoms::menuPopupFrame == childType) {
nsIFrame* parent = aChildFrame->GetParent();
MOZ_ASSERT(parent, "nsMenuPopupFrame can't be the root frame");
if (parent) {
if (parent->GetType() == nsGkAtoms::popupSetFrame) {
id = nsIFrame::kPopupList;
} else {
nsIFrame* firstPopup = parent->GetFirstChild(nsIFrame::kPopupList);
MOZ_ASSERT(!firstPopup || !firstPopup->GetNextSibling(),
"We assume popupList only has one child, but it has more.");
id = firstPopup == aChildFrame
? nsIFrame::kPopupList
: nsIFrame::kPrincipalList;
}
} else {
id = nsIFrame::kPrincipalList;
}
} else if (nsGkAtoms::tableColGroupFrame == childType) {
id = nsIFrame::kColGroupList;
} else if (nsGkAtoms::tableCaptionFrame == childType) {
id = nsIFrame::kCaptionList;
} else {
id = nsIFrame::kPrincipalList;
}
}
#ifdef DEBUG
// Verify that the frame is actually in that child list or in the
// corresponding overflow list.
nsIFrame* parent = aChildFrame->GetParent();
bool found = parent->GetChildList(id).ContainsFrame(aChildFrame);
if (!found) {
if (!(aChildFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
found = parent->GetChildList(nsIFrame::kOverflowList)
.ContainsFrame(aChildFrame);
}
else if (aChildFrame->IsFloating()) {
found = parent->GetChildList(nsIFrame::kOverflowOutOfFlowList)
.ContainsFrame(aChildFrame);
if (!found) {
found = parent->GetChildList(nsIFrame::kPushedFloatsList)
.ContainsFrame(aChildFrame);
}
}
// else it's positioned and should have been on the 'id' child list.
NS_POSTCONDITION(found, "not in child list");
}
#endif
return id;
}
// static
nsIFrame*
nsLayoutUtils::GetBeforeFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
NS_ASSERTION(!aFrame->GetPrevContinuation(),
"aFrame must be first continuation");
nsIFrame* firstFrame = GetFirstChildFrame(aFrame, aFrame->GetContent());
if (firstFrame && IsGeneratedContentFor(nullptr, firstFrame,
nsCSSPseudoElements::before)) {
return firstFrame;
}
return nullptr;
}
// static
nsIFrame*
nsLayoutUtils::GetAfterFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
nsIFrame* lastFrame = GetLastChildFrame(aFrame, aFrame->GetContent());
if (lastFrame && IsGeneratedContentFor(nullptr, lastFrame,
nsCSSPseudoElements::after)) {
return lastFrame;
}
return nullptr;
}
// static
nsIFrame*
nsLayoutUtils::GetClosestFrameOfType(nsIFrame* aFrame, nsIAtom* aFrameType)
{
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
if (frame->GetType() == aFrameType) {
return frame;
}
}
return nullptr;
}
// static
nsIFrame*
nsLayoutUtils::GetStyleFrame(nsIFrame* aFrame)
{
if (aFrame->GetType() == nsGkAtoms::tableOuterFrame) {
nsIFrame* inner = aFrame->GetFirstPrincipalChild();
NS_ASSERTION(inner, "Outer table must have an inner");
return inner;
}
return aFrame;
}
nsIFrame*
nsLayoutUtils::GetStyleFrame(const nsIContent* aContent)
{
nsIFrame *frame = aContent->GetPrimaryFrame();
if (!frame) {
return nullptr;
}
return nsLayoutUtils::GetStyleFrame(frame);
}
nsIFrame*
nsLayoutUtils::GetFloatFromPlaceholder(nsIFrame* aFrame) {
NS_ASSERTION(nsGkAtoms::placeholderFrame == aFrame->GetType(),
"Must have a placeholder here");
if (aFrame->GetStateBits() & PLACEHOLDER_FOR_FLOAT) {
nsIFrame *outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame);
NS_ASSERTION(outOfFlowFrame->IsFloating(),
"How did that happen?");
return outOfFlowFrame;
}
return nullptr;
}
// static
bool
nsLayoutUtils::IsGeneratedContentFor(nsIContent* aContent,
nsIFrame* aFrame,
nsIAtom* aPseudoElement)
{
NS_PRECONDITION(aFrame, "Must have a frame");
NS_PRECONDITION(aPseudoElement, "Must have a pseudo name");
if (!aFrame->IsGeneratedContentFrame()) {
return false;
}
nsIFrame* parent = aFrame->GetParent();
NS_ASSERTION(parent, "Generated content can't be root frame");
if (parent->IsGeneratedContentFrame()) {
// Not the root of the generated content
return false;
}
if (aContent && parent->GetContent() != aContent) {
return false;
}
return (aFrame->GetContent()->Tag() == nsGkAtoms::mozgeneratedcontentbefore) ==
(aPseudoElement == nsCSSPseudoElements::before);
}
// static
nsIFrame*
nsLayoutUtils::GetCrossDocParentFrame(const nsIFrame* aFrame,
nsPoint* aExtraOffset)
{
nsIFrame* p = aFrame->GetParent();
if (p)
return p;
nsView* v = aFrame->GetView();
if (!v)
return nullptr;
v = v->GetParent(); // anonymous inner view
if (!v)
return nullptr;
if (aExtraOffset) {
*aExtraOffset += v->GetPosition();
}
v = v->GetParent(); // subdocumentframe's view
return v ? v->GetFrame() : nullptr;
}
// static
bool
nsLayoutUtils::IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aAncestorFrame)
return false;
return IsAncestorFrameCrossDoc(aAncestorFrame, aFrame, aCommonAncestor);
}
// static
bool
nsLayoutUtils::IsAncestorFrameCrossDoc(const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
const nsIFrame* aCommonAncestor)
{
for (const nsIFrame* f = aFrame; f != aCommonAncestor;
f = GetCrossDocParentFrame(f)) {
if (f == aAncestorFrame)
return true;
}
return aCommonAncestor == aAncestorFrame;
}
// static
bool
nsLayoutUtils::IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aAncestorFrame)
return false;
for (nsIFrame* f = aFrame; f != aCommonAncestor; f = f->GetParent()) {
if (f == aAncestorFrame)
return true;
}
return aCommonAncestor == aAncestorFrame;
}
// static
int32_t
nsLayoutUtils::DoCompareTreePosition(nsIContent* aContent1,
nsIContent* aContent2,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
const nsIContent* aCommonAncestor)
{
NS_PRECONDITION(aContent1, "aContent1 must not be null");
NS_PRECONDITION(aContent2, "aContent2 must not be null");
nsAutoTArray<nsINode*, 32> content1Ancestors;
nsINode* c1;
for (c1 = aContent1; c1 && c1 != aCommonAncestor; c1 = c1->GetParentNode()) {
content1Ancestors.AppendElement(c1);
}
if (!c1 && aCommonAncestor) {
// So, it turns out aCommonAncestor was not an ancestor of c1. Oops.
// Never mind. We can continue as if aCommonAncestor was null.
aCommonAncestor = nullptr;
}
nsAutoTArray<nsINode*, 32> content2Ancestors;
nsINode* c2;
for (c2 = aContent2; c2 && c2 != aCommonAncestor; c2 = c2->GetParentNode()) {
content2Ancestors.AppendElement(c2);
}
if (!c2 && aCommonAncestor) {
// So, it turns out aCommonAncestor was not an ancestor of c2.
// We need to retry with no common ancestor hint.
return DoCompareTreePosition(aContent1, aContent2,
aIf1Ancestor, aIf2Ancestor, nullptr);
}
int last1 = content1Ancestors.Length() - 1;
int last2 = content2Ancestors.Length() - 1;
nsINode* content1Ancestor = nullptr;
nsINode* content2Ancestor = nullptr;
while (last1 >= 0 && last2 >= 0
&& ((content1Ancestor = content1Ancestors.ElementAt(last1)) ==
(content2Ancestor = content2Ancestors.ElementAt(last2)))) {
last1--;
last2--;
}
if (last1 < 0) {
if (last2 < 0) {
NS_ASSERTION(aContent1 == aContent2, "internal error?");
return 0;
}
// aContent1 is an ancestor of aContent2
return aIf1Ancestor;
}
if (last2 < 0) {
// aContent2 is an ancestor of aContent1
return aIf2Ancestor;
}
// content1Ancestor != content2Ancestor, so they must be siblings with the same parent
nsINode* parent = content1Ancestor->GetParentNode();
#ifdef DEBUG
// TODO: remove the uglyness, see bug 598468.
NS_ASSERTION(gPreventAssertInCompareTreePosition || parent,
"no common ancestor at all???");
#endif // DEBUG
if (!parent) { // different documents??
return 0;
}
int32_t index1 = parent->IndexOf(content1Ancestor);
int32_t index2 = parent->IndexOf(content2Ancestor);
if (index1 < 0 || index2 < 0) {
// one of them must be anonymous; we can't determine the order
return 0;
}
return index1 - index2;
}
// static
nsIFrame*
nsLayoutUtils::FillAncestors(nsIFrame* aFrame,
nsIFrame* aStopAtAncestor,
nsTArray<nsIFrame*>* aAncestors)
{
while (aFrame && aFrame != aStopAtAncestor) {
aAncestors->AppendElement(aFrame);
aFrame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
}
return aFrame;
}
// Return true if aFrame1 is after aFrame2
static bool IsFrameAfter(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
nsIFrame* f = aFrame2;
do {
f = f->GetNextSibling();
if (f == aFrame1)
return true;
} while (f);
return false;
}
// static
int32_t
nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
nsIFrame* aCommonAncestor)
{
NS_PRECONDITION(aFrame1, "aFrame1 must not be null");
NS_PRECONDITION(aFrame2, "aFrame2 must not be null");
nsAutoTArray<nsIFrame*,20> frame2Ancestors;
nsIFrame* nonCommonAncestor =
FillAncestors(aFrame2, aCommonAncestor, &frame2Ancestors);
return DoCompareTreePosition(aFrame1, aFrame2, frame2Ancestors,
aIf1Ancestor, aIf2Ancestor,
nonCommonAncestor ? aCommonAncestor : nullptr);
}
// static
int32_t
nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
nsTArray<nsIFrame*>& aFrame2Ancestors,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
nsIFrame* aCommonAncestor)
{
NS_PRECONDITION(aFrame1, "aFrame1 must not be null");
NS_PRECONDITION(aFrame2, "aFrame2 must not be null");
nsPresContext* presContext = aFrame1->PresContext();
if (presContext != aFrame2->PresContext()) {
NS_ERROR("no common ancestor at all, different documents");
return 0;
}
nsAutoTArray<nsIFrame*,20> frame1Ancestors;
if (aCommonAncestor &&
!FillAncestors(aFrame1, aCommonAncestor, &frame1Ancestors)) {
// We reached the root of the frame tree ... if aCommonAncestor was set,
// it is wrong
return DoCompareTreePosition(aFrame1, aFrame2,
aIf1Ancestor, aIf2Ancestor, nullptr);
}
int32_t last1 = int32_t(frame1Ancestors.Length()) - 1;
int32_t last2 = int32_t(aFrame2Ancestors.Length()) - 1;
while (last1 >= 0 && last2 >= 0 &&
frame1Ancestors[last1] == aFrame2Ancestors[last2]) {
last1--;
last2--;
}
if (last1 < 0) {
if (last2 < 0) {
NS_ASSERTION(aFrame1 == aFrame2, "internal error?");
return 0;
}
// aFrame1 is an ancestor of aFrame2
return aIf1Ancestor;
}
if (last2 < 0) {
// aFrame2 is an ancestor of aFrame1
return aIf2Ancestor;
}
nsIFrame* ancestor1 = frame1Ancestors[last1];
nsIFrame* ancestor2 = aFrame2Ancestors[last2];
// Now we should be able to walk sibling chains to find which one is first
if (IsFrameAfter(ancestor2, ancestor1))
return -1;
if (IsFrameAfter(ancestor1, ancestor2))
return 1;
NS_WARNING("Frames were in different child lists???");
return 0;
}
// static
nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) {
if (!aFrame) {
return nullptr;
}
nsIFrame* next;
while ((next = aFrame->GetNextSibling()) != nullptr) {
aFrame = next;
}
return aFrame;
}
// static
nsView*
nsLayoutUtils::FindSiblingViewFor(nsView* aParentView, nsIFrame* aFrame) {
nsIFrame* parentViewFrame = aParentView->GetFrame();
nsIContent* parentViewContent = parentViewFrame ? parentViewFrame->GetContent() : nullptr;
for (nsView* insertBefore = aParentView->GetFirstChild(); insertBefore;
insertBefore = insertBefore->GetNextSibling()) {
nsIFrame* f = insertBefore->GetFrame();
if (!f) {
// this view could be some anonymous view attached to a meaningful parent
for (nsView* searchView = insertBefore->GetParent(); searchView;
searchView = searchView->GetParent()) {
f = searchView->GetFrame();
if (f) {
break;
}
}
NS_ASSERTION(f, "Can't find a frame anywhere!");
}
if (!f || !aFrame->GetContent() || !f->GetContent() ||
CompareTreePosition(aFrame->GetContent(), f->GetContent(), parentViewContent) > 0) {
// aFrame's content is after f's content (or we just don't know),
// so put our view before f's view
return insertBefore;
}
}
return nullptr;
}
//static
nsIScrollableFrame*
nsLayoutUtils::GetScrollableFrameFor(const nsIFrame *aScrolledFrame)
{
nsIFrame *frame = aScrolledFrame->GetParent();
nsIScrollableFrame *sf = do_QueryFrame(frame);
return sf;
}
/* static */ void
nsLayoutUtils::SetFixedPositionLayerData(Layer* aLayer,
const nsIFrame* aViewportFrame,
const nsRect& aAnchorRect,
const nsIFrame* aFixedPosFrame,
nsPresContext* aPresContext,
const ContainerLayerParameters& aContainerParameters) {
// Find out the rect of the viewport frame relative to the reference frame.
// This, in conjunction with the container scale, will correspond to the
// coordinate-space of the built layer.
float factor = aPresContext->AppUnitsPerDevPixel();
Rect anchorRect(NSAppUnitsToFloatPixels(aAnchorRect.x, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(aAnchorRect.y, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(aAnchorRect.width, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(aAnchorRect.height, factor) *
aContainerParameters.mYScale);
// Need to transform anchorRect from the container layer's coordinate system
// into aLayer's coordinate system.
Matrix transform2d;
if (aLayer->GetTransform().Is2D(&transform2d)) {
transform2d.Invert();
anchorRect = transform2d.TransformBounds(anchorRect);
} else {
NS_ERROR("3D transform found between fixedpos content and its viewport (should never happen)");
anchorRect = Rect(0,0,0,0);
}
// Work out the anchor point for this fixed position layer. We assume that
// any positioning set (left/top/right/bottom) indicates that the
// corresponding side of its container should be the anchor point,
// defaulting to top-left.
LayerPoint anchor(anchorRect.x, anchorRect.y);
// Make sure the layer is aware of any fixed position margins that have
// been set.
nsMargin fixedMargins = aPresContext->PresShell()->GetContentDocumentFixedPositionMargins();
LayerMargin fixedLayerMargins(NSAppUnitsToFloatPixels(fixedMargins.top, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(fixedMargins.right, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(fixedMargins.bottom, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(fixedMargins.left, factor) *
aContainerParameters.mXScale);
if (aFixedPosFrame != aViewportFrame) {
const nsStylePosition* position = aFixedPosFrame->StylePosition();
if (position->mOffset.GetRightUnit() != eStyleUnit_Auto) {
if (position->mOffset.GetLeftUnit() != eStyleUnit_Auto) {
anchor.x = anchorRect.x + anchorRect.width / 2.f;
} else {
anchor.x = anchorRect.XMost();
}
}
if (position->mOffset.GetBottomUnit() != eStyleUnit_Auto) {
if (position->mOffset.GetTopUnit() != eStyleUnit_Auto) {
anchor.y = anchorRect.y + anchorRect.height / 2.f;
} else {
anchor.y = anchorRect.YMost();
}
}
// If the frame is auto-positioned on either axis, set the top/left layer
// margins to -1, to indicate to the compositor that this layer is
// unaffected by fixed margins.
if (position->mOffset.GetLeftUnit() == eStyleUnit_Auto &&
position->mOffset.GetRightUnit() == eStyleUnit_Auto) {
fixedLayerMargins.left = -1;
}
if (position->mOffset.GetTopUnit() == eStyleUnit_Auto &&
position->mOffset.GetBottomUnit() == eStyleUnit_Auto) {
fixedLayerMargins.top = -1;
}
}
aLayer->SetFixedPositionAnchor(anchor);
aLayer->SetFixedPositionMargins(fixedLayerMargins);
}
bool
nsLayoutUtils::ViewportHasDisplayPort(nsPresContext* aPresContext, nsRect* aDisplayPort)
{
nsIFrame* rootScrollFrame =
aPresContext->PresShell()->GetRootScrollFrame();
return rootScrollFrame &&
nsLayoutUtils::GetDisplayPort(rootScrollFrame->GetContent(), aDisplayPort);
}
bool
nsLayoutUtils::IsFixedPosFrameInDisplayPort(const nsIFrame* aFrame, nsRect* aDisplayPort)
{
// Fixed-pos frames are parented by the viewport frame or the page content frame.
// We'll assume that printing/print preview don't have displayports for their
// pages!
nsIFrame* parent = aFrame->GetParent();
if (!parent || parent->GetParent() ||
aFrame->StyleDisplay()->mPosition != NS_STYLE_POSITION_FIXED) {
return false;
}
return ViewportHasDisplayPort(aFrame->PresContext(), aDisplayPort);
}
nsIFrame*
nsLayoutUtils::GetAnimatedGeometryRootFor(nsIFrame* aFrame,
const nsIFrame* aStopAtAncestor)
{
nsIFrame* f = aFrame;
nsIFrame* stickyFrame = nullptr;
while (f != aStopAtAncestor) {
if (IsPopup(f))
break;
if (ActiveLayerTracker::IsOffsetOrMarginStyleAnimated(f))
break;
if (!f->GetParent() && ViewportHasDisplayPort(f->PresContext())) {
// Viewport frames in a display port need to be animated geometry roots
// for background-attachment:fixed elements.
break;
}
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent)
break;
nsIAtom* parentType = parent->GetType();
#ifdef ANDROID
// Treat the slider thumb as being as an active scrolled root
// on mobile so that it can move without repainting.
if (parentType == nsGkAtoms::sliderFrame)
break;
#endif
// Sticky frames are active if their nearest scrollable frame
// is also active, just keep a record of sticky frames that we
// encounter for now.
if (f->StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY &&
!stickyFrame) {
stickyFrame = f;
}
if (parentType == nsGkAtoms::scrollFrame) {
nsIScrollableFrame* sf = do_QueryFrame(parent);
if (sf->IsScrollingActive() && sf->GetScrolledFrame() == f) {
// If we found a sticky frame inside this active scroll frame,
// then use that. Otherwise use the scroll frame.
if (stickyFrame) {
return stickyFrame;
}
return f;
} else {
stickyFrame = nullptr;
}
}
// Fixed-pos frames are parented by the viewport frame, which has no parent
if (IsFixedPosFrameInDisplayPort(f)) {
return f;
}
f = parent;
}
return f;
}
nsIFrame*
nsLayoutUtils::GetAnimatedGeometryRootFor(nsDisplayItem* aItem,
nsDisplayListBuilder* aBuilder)
{
nsIFrame* f = aItem->Frame();
if (aItem->GetType() == nsDisplayItem::TYPE_SCROLL_LAYER) {
nsDisplayScrollLayer* scrollLayerItem =
static_cast<nsDisplayScrollLayer*>(aItem);
nsIFrame* scrolledFrame = scrollLayerItem->GetScrolledFrame();
return nsLayoutUtils::GetAnimatedGeometryRootFor(scrolledFrame,
aBuilder->FindReferenceFrameFor(scrolledFrame));
}
if (aItem->ShouldFixToViewport(aBuilder)) {
// Make its active scrolled root be the active scrolled root of
// the enclosing viewport, since it shouldn't be scrolled by scrolled
// frames in its document. InvalidateFixedBackgroundFramesFromList in
// nsGfxScrollFrame will not repaint this item when scrolling occurs.
nsIFrame* viewportFrame =
nsLayoutUtils::GetClosestFrameOfType(f, nsGkAtoms::viewportFrame);
NS_ASSERTION(viewportFrame, "no viewport???");
return nsLayoutUtils::GetAnimatedGeometryRootFor(viewportFrame,
aBuilder->FindReferenceFrameFor(viewportFrame));
}
return nsLayoutUtils::GetAnimatedGeometryRootFor(f, aItem->ReferenceFrame());
}
// static
nsIScrollableFrame*
nsLayoutUtils::GetNearestScrollableFrameForDirection(nsIFrame* aFrame,
Direction aDirection)
{
NS_ASSERTION(aFrame, "GetNearestScrollableFrameForDirection expects a non-null frame");
for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
if (scrollableFrame) {
ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
uint32_t directions = scrollableFrame->GetPerceivedScrollingDirections();
if (aDirection == eVertical ?
(ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN &&
(directions & nsIScrollableFrame::VERTICAL)) :
(ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
(directions & nsIScrollableFrame::HORIZONTAL)))
return scrollableFrame;
}
}
return nullptr;
}
// static
nsIScrollableFrame*
nsLayoutUtils::GetNearestScrollableFrame(nsIFrame* aFrame, uint32_t aFlags)
{
NS_ASSERTION(aFrame, "GetNearestScrollableFrame expects a non-null frame");
for (nsIFrame* f = aFrame; f; f = (aFlags & SCROLLABLE_SAME_DOC) ?
f->GetParent() : nsLayoutUtils::GetCrossDocParentFrame(f)) {
nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
if (scrollableFrame) {
ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
if ((aFlags & SCROLLABLE_INCLUDE_HIDDEN) ||
ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN ||
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN)
return scrollableFrame;
}
}
return nullptr;
}
// static
nsRect
nsLayoutUtils::GetScrolledRect(nsIFrame* aScrolledFrame,
const nsRect& aScrolledFrameOverflowArea,
const nsSize& aScrollPortSize,
uint8_t aDirection)
{
nscoord x1 = aScrolledFrameOverflowArea.x,
x2 = aScrolledFrameOverflowArea.XMost(),
y1 = aScrolledFrameOverflowArea.y,
y2 = aScrolledFrameOverflowArea.YMost();
if (y1 < 0) {
y1 = 0;
}
if (aDirection != NS_STYLE_DIRECTION_RTL) {
if (x1 < 0) {
x1 = 0;
}
} else {
if (x2 > aScrollPortSize.width) {
x2 = aScrollPortSize.width;
}
// When the scrolled frame chooses a size larger than its available width (because
// its padding alone is larger than the available width), we need to keep the
// start-edge of the scroll frame anchored to the start-edge of the scrollport.
// When the scrolled frame is RTL, this means moving it in our left-based
// coordinate system, so we need to compensate for its extra width here by
// effectively repositioning the frame.
nscoord extraWidth = std::max(0, aScrolledFrame->GetSize().width - aScrollPortSize.width);
x2 += extraWidth;
}
return nsRect(x1, y1, x2 - x1, y2 - y1);
}
//static
bool
nsLayoutUtils::HasPseudoStyle(nsIContent* aContent,
nsStyleContext* aStyleContext,
nsCSSPseudoElements::Type aPseudoElement,
nsPresContext* aPresContext)
{
NS_PRECONDITION(aPresContext, "Must have a prescontext");
nsRefPtr<nsStyleContext> pseudoContext;
if (aContent) {
pseudoContext = aPresContext->StyleSet()->
ProbePseudoElementStyle(aContent->AsElement(), aPseudoElement,
aStyleContext);
}
return pseudoContext != nullptr;
}
nsPoint
nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent, nsIFrame* aFrame)
{
if (!aDOMEvent)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
WidgetEvent* event = aDOMEvent->GetInternalNSEvent();
if (!event)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
return GetEventCoordinatesRelativeTo(event, aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(const WidgetEvent* aEvent,
nsIFrame* aFrame)
{
if (!aEvent || (aEvent->eventStructType != NS_MOUSE_EVENT &&
aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT &&
aEvent->eventStructType != NS_WHEEL_EVENT &&
aEvent->eventStructType != NS_DRAG_EVENT &&
aEvent->eventStructType != NS_SIMPLE_GESTURE_EVENT &&
aEvent->eventStructType != NS_POINTER_EVENT &&
aEvent->eventStructType != NS_GESTURENOTIFY_EVENT &&
aEvent->eventStructType != NS_TOUCH_EVENT &&
aEvent->eventStructType != NS_QUERY_CONTENT_EVENT))
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
return GetEventCoordinatesRelativeTo(aEvent,
LayoutDeviceIntPoint::ToUntyped(aEvent->AsGUIEvent()->refPoint),
aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(const WidgetEvent* aEvent,
const nsIntPoint aPoint,
nsIFrame* aFrame)
{
if (!aFrame) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsIWidget* widget = aEvent->AsGUIEvent()->widget;
if (!widget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
return GetEventCoordinatesRelativeTo(widget, aPoint, aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(nsIWidget* aWidget,
const nsIntPoint aPoint,
nsIFrame* aFrame)
{
if (!aFrame || !aWidget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsView* view = aFrame->GetView();
if (view) {
nsIWidget* frameWidget = view->GetWidget();
if (frameWidget && frameWidget == aWidget) {
// Special case this cause it happens a lot.
// This also fixes bug 664707, events in the extra-special case of select
// dropdown popups that are transformed.
nsPresContext* presContext = aFrame->PresContext();
nsPoint pt(presContext->DevPixelsToAppUnits(aPoint.x),
presContext->DevPixelsToAppUnits(aPoint.y));
return pt - view->ViewToWidgetOffset();
}
}
/* If we walk up the frame tree and discover that any of the frames are
* transformed, we need to do extra work to convert from the global
* space to the local space.
*/
nsIFrame* rootFrame = aFrame;
bool transformFound = false;
for (nsIFrame* f = aFrame; f; f = GetCrossDocParentFrame(f)) {
if (f->IsTransformed()) {
transformFound = true;
}
rootFrame = f;
}
nsView* rootView = rootFrame->GetView();
if (!rootView) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsPoint widgetToView = TranslateWidgetToView(rootFrame->PresContext(),
aWidget, aPoint, rootView);
if (widgetToView == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
// Convert from root document app units to app units of the document aFrame
// is in.
int32_t rootAPD = rootFrame->PresContext()->AppUnitsPerDevPixel();
int32_t localAPD = aFrame->PresContext()->AppUnitsPerDevPixel();
widgetToView = widgetToView.ConvertAppUnits(rootAPD, localAPD);
/* If we encountered a transform, we can't do simple arithmetic to figure
* out how to convert back to aFrame's coordinates and must use the CTM.
*/
if (transformFound || aFrame->IsSVGText()) {
return TransformRootPointToFrame(aFrame, widgetToView);
}
/* Otherwise, all coordinate systems are translations of one another,
* so we can just subtract out the difference.
*/
return widgetToView - aFrame->GetOffsetToCrossDoc(rootFrame);
}
nsIFrame*
nsLayoutUtils::GetPopupFrameForEventCoordinates(nsPresContext* aPresContext,
const WidgetEvent* aEvent)
{
#ifdef MOZ_XUL
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (!pm) {
return nullptr;
}
nsTArray<nsIFrame*> popups;
pm->GetVisiblePopups(popups);
uint32_t i;
// Search from top to bottom
for (i = 0; i < popups.Length(); i++) {
nsIFrame* popup = popups[i];
if (popup->PresContext()->GetRootPresContext() == aPresContext &&
popup->GetScrollableOverflowRect().Contains(
GetEventCoordinatesRelativeTo(aEvent, popup))) {
return popup;
}
}
#endif
return nullptr;
}
gfx3DMatrix
nsLayoutUtils::ChangeMatrixBasis(const gfxPoint3D &aOrigin,
const gfx3DMatrix &aMatrix)
{
gfx3DMatrix result = aMatrix;
/* Translate to the origin before aMatrix */
result.Translate(-aOrigin);
/* Translate back into position after aMatrix */
result.TranslatePost(aOrigin);
return result;
}
static void ConstrainToCoordValues(float& aStart, float& aSize)
{
MOZ_ASSERT(aSize > 0);
// Here we try to make sure that the resulting nsRect will continue to cover
// as much of the area that was covered by the original gfx Rect as possible.
// We clamp the bounds of the rect to {nscoord_MIN,nscoord_MAX} since
// nsRect::X/Y() and nsRect::XMost/YMost() can't return values outwith this
// range:
float end = aStart + aSize;
aStart = clamped(aStart, float(nscoord_MIN), float(nscoord_MAX));
end = clamped(end, float(nscoord_MIN), float(nscoord_MAX));
aSize = end - aStart;
// We must also clamp aSize to {0,nscoord_MAX} since nsRect::Width/Height()
// can't return a value greater than nscoord_MAX. If aSize is greater than
// nscoord_MAX then we reduce it to nscoord_MAX while keeping the rect
// centered:
if (aSize > nscoord_MAX) {
float excess = aSize - nscoord_MAX;
excess /= 2;
aStart += excess;
aSize = nscoord_MAX;
}
}
/**
* Given a gfxFloat, constrains its value to be between nscoord_MIN and nscoord_MAX.
*
* @param aVal The value to constrain (in/out)
*/
static void ConstrainToCoordValues(gfxFloat& aVal)
{
if (aVal <= nscoord_MIN)
aVal = nscoord_MIN;
else if (aVal >= nscoord_MAX)
aVal = nscoord_MAX;
}
static void ConstrainToCoordValues(gfxFloat& aStart, gfxFloat& aSize)
{
gfxFloat max = aStart + aSize;
// Clamp the end points to within nscoord range
ConstrainToCoordValues(aStart);
ConstrainToCoordValues(max);
aSize = max - aStart;
// If the width if still greater than the max nscoord, then bring both
// endpoints in by the same amount until it fits.
if (aSize > nscoord_MAX) {
gfxFloat excess = aSize - nscoord_MAX;
excess /= 2;
aStart += excess;
aSize = nscoord_MAX;
} else if (aSize < nscoord_MIN) {
gfxFloat excess = aSize - nscoord_MIN;
excess /= 2;
aStart -= excess;
aSize = nscoord_MIN;
}
}
nsRect
nsLayoutUtils::RoundGfxRectToAppRect(const Rect &aRect, float aFactor)
{
/* Get a new Rect whose units are app units by scaling by the specified factor. */
Rect scaledRect = aRect;
scaledRect.ScaleRoundOut(aFactor);
/* We now need to constrain our results to the max and min values for coords. */
ConstrainToCoordValues(scaledRect.x, scaledRect.width);
ConstrainToCoordValues(scaledRect.y, scaledRect.height);
/* Now typecast everything back. This is guaranteed to be safe. */
return nsRect(nscoord(scaledRect.X()), nscoord(scaledRect.Y()),
nscoord(scaledRect.Width()), nscoord(scaledRect.Height()));
}
nsRect
nsLayoutUtils::RoundGfxRectToAppRect(const gfxRect &aRect, float aFactor)
{
/* Get a new gfxRect whose units are app units by scaling by the specified factor. */
gfxRect scaledRect = aRect;
scaledRect.ScaleRoundOut(aFactor);
/* We now need to constrain our results to the max and min values for coords. */
ConstrainToCoordValues(scaledRect.x, scaledRect.width);
ConstrainToCoordValues(scaledRect.y, scaledRect.height);
/* Now typecast everything back. This is guaranteed to be safe. */
return nsRect(nscoord(scaledRect.X()), nscoord(scaledRect.Y()),
nscoord(scaledRect.Width()), nscoord(scaledRect.Height()));
}
nsRegion
nsLayoutUtils::RoundedRectIntersectRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect)
{
// rectFullHeight and rectFullWidth together will approximately contain
// the total area of the frame minus the rounded corners.
nsRect rectFullHeight = aRoundedRect;
nscoord xDiff = std::max(aRadii[NS_CORNER_TOP_LEFT_X], aRadii[NS_CORNER_BOTTOM_LEFT_X]);
rectFullHeight.x += xDiff;
rectFullHeight.width -= std::max(aRadii[NS_CORNER_TOP_RIGHT_X],
aRadii[NS_CORNER_BOTTOM_RIGHT_X]) + xDiff;
nsRect r1;
r1.IntersectRect(rectFullHeight, aContainedRect);
nsRect rectFullWidth = aRoundedRect;
nscoord yDiff = std::max(aRadii[NS_CORNER_TOP_LEFT_Y], aRadii[NS_CORNER_TOP_RIGHT_Y]);
rectFullWidth.y += yDiff;
rectFullWidth.height -= std::max(aRadii[NS_CORNER_BOTTOM_LEFT_Y],
aRadii[NS_CORNER_BOTTOM_RIGHT_Y]) + yDiff;
nsRect r2;
r2.IntersectRect(rectFullWidth, aContainedRect);
nsRegion result;
result.Or(r1, r2);
return result;
}
// Helper for RoundedRectIntersectsRect.
static bool
CheckCorner(nscoord aXOffset, nscoord aYOffset,
nscoord aXRadius, nscoord aYRadius)
{
NS_ABORT_IF_FALSE(aXOffset > 0 && aYOffset > 0,
"must not pass nonpositives to CheckCorner");
NS_ABORT_IF_FALSE(aXRadius >= 0 && aYRadius >= 0,
"must not pass negatives to CheckCorner");
// Avoid floating point math unless we're either (1) within the
// quarter-ellipse area at the rounded corner or (2) outside the
// rounding.
if (aXOffset >= aXRadius || aYOffset >= aYRadius)
return true;
// Convert coordinates to a unit circle with (0,0) as the center of
// curvature, and see if we're inside the circle or outside.
float scaledX = float(aXRadius - aXOffset) / float(aXRadius);
float scaledY = float(aYRadius - aYOffset) / float(aYRadius);
return scaledX * scaledX + scaledY * scaledY < 1.0f;
}
bool
nsLayoutUtils::RoundedRectIntersectsRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aTestRect)
{
if (!aTestRect.Intersects(aRoundedRect))
return false;
// distances from this edge of aRoundedRect to opposite edge of aTestRect,
// which we know are positive due to the Intersects check above.
nsMargin insets;
insets.top = aTestRect.YMost() - aRoundedRect.y;
insets.right = aRoundedRect.XMost() - aTestRect.x;
insets.bottom = aRoundedRect.YMost() - aTestRect.y;
insets.left = aTestRect.XMost() - aRoundedRect.x;
// Check whether the bottom-right corner of aTestRect is inside the
// top left corner of aBounds when rounded by aRadii, etc. If any
// corner is not, then fail; otherwise succeed.
return CheckCorner(insets.left, insets.top,
aRadii[NS_CORNER_TOP_LEFT_X],
aRadii[NS_CORNER_TOP_LEFT_Y]) &&
CheckCorner(insets.right, insets.top,
aRadii[NS_CORNER_TOP_RIGHT_X],
aRadii[NS_CORNER_TOP_RIGHT_Y]) &&
CheckCorner(insets.right, insets.bottom,
aRadii[NS_CORNER_BOTTOM_RIGHT_X],
aRadii[NS_CORNER_BOTTOM_RIGHT_Y]) &&
CheckCorner(insets.left, insets.bottom,
aRadii[NS_CORNER_BOTTOM_LEFT_X],
aRadii[NS_CORNER_BOTTOM_LEFT_Y]);
}
nsRect
nsLayoutUtils::MatrixTransformRectOut(const nsRect &aBounds,
const gfx3DMatrix &aMatrix, float aFactor)
{
nsRect outside = aBounds;
outside.ScaleRoundOut(1/aFactor);
gfxRect image = aMatrix.TransformBounds(gfxRect(outside.x,
outside.y,
outside.width,
outside.height));
return RoundGfxRectToAppRect(image, aFactor);
}
nsRect
nsLayoutUtils::MatrixTransformRect(const nsRect &aBounds,
const gfx3DMatrix &aMatrix, float aFactor)
{
gfxRect image = aMatrix.TransformBounds(gfxRect(NSAppUnitsToDoublePixels(aBounds.x, aFactor),
NSAppUnitsToDoublePixels(aBounds.y, aFactor),
NSAppUnitsToDoublePixels(aBounds.width, aFactor),
NSAppUnitsToDoublePixels(aBounds.height, aFactor)));
return RoundGfxRectToAppRect(image, aFactor);
}
nsPoint
nsLayoutUtils::MatrixTransformPoint(const nsPoint &aPoint,
const gfx3DMatrix &aMatrix, float aFactor)
{
gfxPoint image = aMatrix.Transform(gfxPoint(NSAppUnitsToFloatPixels(aPoint.x, aFactor),
NSAppUnitsToFloatPixels(aPoint.y, aFactor)));
return nsPoint(NSFloatPixelsToAppUnits(float(image.x), aFactor),
NSFloatPixelsToAppUnits(float(image.y), aFactor));
}
gfx3DMatrix
nsLayoutUtils::GetTransformToAncestor(nsIFrame *aFrame, const nsIFrame *aAncestor)
{
nsIFrame* parent;
gfx3DMatrix ctm;
if (aFrame == aAncestor) {
return ctm;
}
ctm = aFrame->GetTransformMatrix(aAncestor, &parent);
while (parent && parent != aAncestor) {
if (!parent->Preserves3DChildren()) {
ctm.ProjectTo2D();
}
ctm = ctm * parent->GetTransformMatrix(aAncestor, &parent);
}
return ctm;
}
static nsIFrame*
FindNearestCommonAncestorFrame(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
nsAutoTArray<nsIFrame*,100> ancestors1;
nsAutoTArray<nsIFrame*,100> ancestors2;
nsIFrame* commonAncestor = nullptr;
if (aFrame1->PresContext() == aFrame2->PresContext()) {
commonAncestor = aFrame1->PresContext()->PresShell()->GetRootFrame();
}
for (nsIFrame* f = aFrame1; f != commonAncestor;
f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
ancestors1.AppendElement(f);
}
for (nsIFrame* f = aFrame2; f != commonAncestor;
f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
ancestors2.AppendElement(f);
}
uint32_t minLengths = std::min(ancestors1.Length(), ancestors2.Length());
for (uint32_t i = 1; i <= minLengths; ++i) {
if (ancestors1[ancestors1.Length() - i] == ancestors2[ancestors2.Length() - i]) {
commonAncestor = ancestors1[ancestors1.Length() - i];
} else {
break;
}
}
return commonAncestor;
}
nsLayoutUtils::TransformResult
nsLayoutUtils::TransformPoints(nsIFrame* aFromFrame, nsIFrame* aToFrame,
uint32_t aPointCount, CSSPoint* aPoints)
{
nsIFrame* nearestCommonAncestor = FindNearestCommonAncestorFrame(aFromFrame, aToFrame);
if (!nearestCommonAncestor) {
return NO_COMMON_ANCESTOR;
}
gfx3DMatrix downToDest = GetTransformToAncestor(aToFrame, nearestCommonAncestor);
if (downToDest.IsSingular()) {
return NONINVERTIBLE_TRANSFORM;
}
downToDest.Invert();
gfx3DMatrix upToAncestor = GetTransformToAncestor(aFromFrame, nearestCommonAncestor);
CSSToLayoutDeviceScale devPixelsPerCSSPixelFromFrame(
double(nsPresContext::AppUnitsPerCSSPixel())/
aFromFrame->PresContext()->AppUnitsPerDevPixel());
CSSToLayoutDeviceScale devPixelsPerCSSPixelToFrame(
double(nsPresContext::AppUnitsPerCSSPixel())/
aToFrame->PresContext()->AppUnitsPerDevPixel());
for (uint32_t i = 0; i < aPointCount; ++i) {
LayoutDevicePoint devPixels = aPoints[i] * devPixelsPerCSSPixelFromFrame;
gfxPoint toDevPixels = downToDest.ProjectPoint(
upToAncestor.ProjectPoint(gfxPoint(devPixels.x, devPixels.y)));
// Divide here so that when the devPixelsPerCSSPixels are the same, we get the correct
// answer instead of some inaccuracy multiplying a number by its reciprocal.
aPoints[i] = LayoutDevicePoint(toDevPixels.x, toDevPixels.y) /
devPixelsPerCSSPixelToFrame;
}
return TRANSFORM_SUCCEEDED;
}
bool
nsLayoutUtils::GetLayerTransformForFrame(nsIFrame* aFrame,
gfx3DMatrix* aTransform)
{
// FIXME/bug 796690: we can sometimes compute a transform in these
// cases, it just increases complexity considerably. Punt for now.
if (aFrame->Preserves3DChildren() || aFrame->HasTransformGetter()) {
return false;
}
nsIFrame* root = nsLayoutUtils::GetDisplayRootFrame(aFrame);
if (root->HasAnyStateBits(NS_FRAME_UPDATE_LAYER_TREE)) {
// Content may have been invalidated, so we can't reliably compute
// the "layer transform" in general.
return false;
}
// If the caller doesn't care about the value, early-return to skip
// overhead below.
if (!aTransform) {
return true;
}
nsDisplayListBuilder builder(root, nsDisplayListBuilder::OTHER,
false/*don't build caret*/);
nsDisplayList list;
nsDisplayTransform* item =
new (&builder) nsDisplayTransform(&builder, aFrame, &list);
*aTransform =
item->GetTransform();
item->~nsDisplayTransform();
return true;
}
static bool
TransformGfxPointFromAncestor(nsIFrame *aFrame,
const gfxPoint &aPoint,
nsIFrame *aAncestor,
gfxPoint* aOut)
{
gfx3DMatrix ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor);
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
nsRect childBounds = aFrame->GetVisualOverflowRectRelativeToSelf();
gfxRect childGfxBounds(NSAppUnitsToFloatPixels(childBounds.x, factor),
NSAppUnitsToFloatPixels(childBounds.y, factor),
NSAppUnitsToFloatPixels(childBounds.width, factor),
NSAppUnitsToFloatPixels(childBounds.height, factor));
return ctm.UntransformPoint(aPoint, childGfxBounds, aOut);
}
static gfxRect
TransformGfxRectToAncestor(nsIFrame *aFrame,
const gfxRect &aRect,
const nsIFrame *aAncestor,
bool* aPreservesAxisAlignedRectangles = nullptr)
{
gfx3DMatrix ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor);
if (aPreservesAxisAlignedRectangles) {
gfxMatrix matrix2d;
*aPreservesAxisAlignedRectangles =
ctm.Is2D(&matrix2d) && matrix2d.PreservesAxisAlignedRectangles();
}
return ctm.TransformBounds(aRect);
}
static SVGTextFrame*
GetContainingSVGTextFrame(nsIFrame* aFrame)
{
if (!aFrame->IsSVGText()) {
return nullptr;
}
return static_cast<SVGTextFrame*>
(nsLayoutUtils::GetClosestFrameOfType(aFrame->GetParent(),
nsGkAtoms::svgTextFrame));
}
nsPoint
nsLayoutUtils::TransformAncestorPointToFrame(nsIFrame* aFrame,
const nsPoint& aPoint,
nsIFrame* aAncestor)
{
SVGTextFrame* text = GetContainingSVGTextFrame(aFrame);
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxPoint result(NSAppUnitsToFloatPixels(aPoint.x, factor),
NSAppUnitsToFloatPixels(aPoint.y, factor));
if (text) {
if (!TransformGfxPointFromAncestor(text, result, aAncestor, &result)) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
result = text->TransformFramePointToTextChild(result, aFrame);
} else {
if (!TransformGfxPointFromAncestor(aFrame, result, nullptr, &result)) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
}
return nsPoint(NSFloatPixelsToAppUnits(float(result.x), factor),
NSFloatPixelsToAppUnits(float(result.y), factor));
}
nsRect
nsLayoutUtils::TransformFrameRectToAncestor(nsIFrame* aFrame,
const nsRect& aRect,
const nsIFrame* aAncestor,
bool* aPreservesAxisAlignedRectangles /* = nullptr */)
{
SVGTextFrame* text = GetContainingSVGTextFrame(aFrame);
float srcAppUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxRect result;
if (text) {
result = text->TransformFrameRectFromTextChild(aRect, aFrame);
result = TransformGfxRectToAncestor(text, result, aAncestor);
// TransformFrameRectFromTextChild could involve any kind of transform, we
// could drill down into it to get an answer out of it but we don't yet.
if (aPreservesAxisAlignedRectangles)
*aPreservesAxisAlignedRectangles = false;
} else {
result = gfxRect(NSAppUnitsToFloatPixels(aRect.x, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.y, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.width, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.height, srcAppUnitsPerDevPixel));
result = TransformGfxRectToAncestor(aFrame, result, aAncestor, aPreservesAxisAlignedRectangles);
}
float destAppUnitsPerDevPixel = aAncestor->PresContext()->AppUnitsPerDevPixel();
return nsRect(NSFloatPixelsToAppUnits(float(result.x), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.y), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.width), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.height), destAppUnitsPerDevPixel));
}
static nsIntPoint GetWidgetOffset(nsIWidget* aWidget, nsIWidget*& aRootWidget) {
nsIntPoint offset(0, 0);
nsIWidget* parent = aWidget->GetParent();
while (parent) {
nsIntRect bounds;
aWidget->GetBounds(bounds);
offset += bounds.TopLeft();
aWidget = parent;
parent = aWidget->GetParent();
}
aRootWidget = aWidget;
return offset;
}
nsPoint
nsLayoutUtils::TranslateWidgetToView(nsPresContext* aPresContext,
nsIWidget* aWidget, nsIntPoint aPt,
nsView* aView)
{
nsPoint viewOffset;
nsIWidget* viewWidget = aView->GetNearestWidget(&viewOffset);
if (!viewWidget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsIWidget* fromRoot;
nsIntPoint fromOffset = GetWidgetOffset(aWidget, fromRoot);
nsIWidget* toRoot;
nsIntPoint toOffset = GetWidgetOffset(viewWidget, toRoot);
nsIntPoint widgetPoint;
if (fromRoot == toRoot) {
widgetPoint = aPt + fromOffset - toOffset;
} else {
nsIntPoint screenPoint = aWidget->WidgetToScreenOffset();
widgetPoint = aPt + screenPoint - viewWidget->WidgetToScreenOffset();
}
nsPoint widgetAppUnits(aPresContext->DevPixelsToAppUnits(widgetPoint.x),
aPresContext->DevPixelsToAppUnits(widgetPoint.y));
return widgetAppUnits - viewOffset;
}
// Combine aNewBreakType with aOrigBreakType, but limit the break types
// to NS_STYLE_CLEAR_LEFT, RIGHT, BOTH.
uint8_t
nsLayoutUtils::CombineBreakType(uint8_t aOrigBreakType,
uint8_t aNewBreakType)
{
uint8_t breakType = aOrigBreakType;
switch(breakType) {
case NS_STYLE_CLEAR_LEFT:
if (NS_STYLE_CLEAR_RIGHT == aNewBreakType ||
NS_STYLE_CLEAR_BOTH == aNewBreakType) {
breakType = NS_STYLE_CLEAR_BOTH;
}
break;
case NS_STYLE_CLEAR_RIGHT:
if (NS_STYLE_CLEAR_LEFT == aNewBreakType ||
NS_STYLE_CLEAR_BOTH == aNewBreakType) {
breakType = NS_STYLE_CLEAR_BOTH;
}
break;
case NS_STYLE_CLEAR_NONE:
if (NS_STYLE_CLEAR_LEFT == aNewBreakType ||
NS_STYLE_CLEAR_RIGHT == aNewBreakType ||
NS_STYLE_CLEAR_BOTH == aNewBreakType) {
breakType = aNewBreakType;
}
}
return breakType;
}
#ifdef MOZ_DUMP_PAINTING
#include <stdio.h>
static bool gDumpEventList = false;
int gPaintCount = 0;
#endif
nsresult
nsLayoutUtils::GetRemoteContentIds(nsIFrame* aFrame,
const nsRect& aTarget,
nsTArray<ViewID> &aOutIDs,
bool aIgnoreRootScrollFrame)
{
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::EVENT_DELIVERY,
false);
nsDisplayList list;
if (aIgnoreRootScrollFrame) {
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (rootScrollFrame) {
builder.SetIgnoreScrollFrame(rootScrollFrame);
}
}
builder.EnterPresShell(aFrame, aTarget);
aFrame->BuildDisplayListForStackingContext(&builder, aTarget, &list);
builder.LeavePresShell(aFrame, aTarget);
nsAutoTArray<nsIFrame*,8> outFrames;
nsDisplayItem::HitTestState hitTestState(&aOutIDs);
list.HitTest(&builder, aTarget, &hitTestState, &outFrames);
list.DeleteAll();
return NS_OK;
}
nsIFrame*
nsLayoutUtils::GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt, uint32_t aFlags)
{
PROFILER_LABEL("nsLayoutUtils", "GetFrameForPoint");
nsresult rv;
nsAutoTArray<nsIFrame*,8> outFrames;
rv = GetFramesForArea(aFrame, nsRect(aPt, nsSize(1, 1)), outFrames, aFlags);
NS_ENSURE_SUCCESS(rv, nullptr);
return outFrames.Length() ? outFrames.ElementAt(0) : nullptr;
}
nsresult
nsLayoutUtils::GetFramesForArea(nsIFrame* aFrame, const nsRect& aRect,
nsTArray<nsIFrame*> &aOutFrames,
uint32_t aFlags)
{
PROFILER_LABEL("nsLayoutUtils","GetFramesForArea");
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::EVENT_DELIVERY,
false);
nsDisplayList list;
nsRect target(aRect);
if (aFlags & IGNORE_PAINT_SUPPRESSION) {
builder.IgnorePaintSuppression();
}
if (aFlags & IGNORE_ROOT_SCROLL_FRAME) {
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (rootScrollFrame) {
builder.SetIgnoreScrollFrame(rootScrollFrame);
}
}
if (aFlags & IGNORE_CROSS_DOC) {
builder.SetDescendIntoSubdocuments(false);
}
builder.EnterPresShell(aFrame, target);
aFrame->BuildDisplayListForStackingContext(&builder, target, &list);
builder.LeavePresShell(aFrame, target);
#ifdef MOZ_DUMP_PAINTING
if (gDumpEventList) {
fprintf_stderr(stderr, "Event handling --- (%d,%d):\n", aRect.x, aRect.y);
nsFrame::PrintDisplayList(&builder, list);
}
#endif
nsDisplayItem::HitTestState hitTestState;
list.HitTest(&builder, target, &hitTestState, &aOutFrames);
list.DeleteAll();
return NS_OK;
}
nsresult
nsLayoutUtils::PaintFrame(nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const nsRegion& aDirtyRegion, nscolor aBackstop,
uint32_t aFlags)
{
PROFILER_LABEL("nsLayoutUtils","PaintFrame");
if (aFlags & PAINT_WIDGET_LAYERS) {
nsView* view = aFrame->GetView();
if (!(view && view->GetWidget() && GetDisplayRootFrame(aFrame) == aFrame)) {
aFlags &= ~PAINT_WIDGET_LAYERS;
NS_ASSERTION(aRenderingContext, "need a rendering context");
}
}
nsPresContext* presContext = aFrame->PresContext();
nsIPresShell* presShell = presContext->PresShell();
nsRootPresContext* rootPresContext = presContext->GetRootPresContext();
if (!rootPresContext) {
return NS_OK;
}
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
bool usingDisplayPort = false;
nsRect displayport;
if (rootScrollFrame && !aFrame->GetParent()) {
nsIContent* content = rootScrollFrame->GetContent();
if (content) {
usingDisplayPort = nsLayoutUtils::GetDisplayPort(content);
if (usingDisplayPort) {
nsLayoutUtils::SetDisplayPortBase(content,
nsRect(nsPoint(0,0), nsLayoutUtils::CalculateCompositionSizeForFrame(rootScrollFrame)));
nsLayoutUtils::GetDisplayPort(content, &displayport);
}
}
}
nsRegion visibleRegion;
if (aFlags & PAINT_WIDGET_LAYERS) {
// This layer tree will be reused, so we'll need to calculate it
// for the whole "visible" area of the window
//
// |ignoreViewportScrolling| and |usingDisplayPort| are persistent
// document-rendering state. We rely on PresShell to flush
// retained layers as needed when that persistent state changes.
if (!usingDisplayPort) {
visibleRegion = aFrame->GetVisualOverflowRectRelativeToSelf();
} else {
visibleRegion = displayport;
}
} else {
visibleRegion = aDirtyRegion;
}
// If we're going to display something different from what we'd normally
// paint in a window then we will flush out any retained layer trees before
// *and after* we draw.
bool willFlushRetainedLayers = (aFlags & PAINT_HIDE_CARET) != 0;
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::PAINTING,
!(aFlags & PAINT_HIDE_CARET));
nsDisplayList list;
if (aFlags & PAINT_IN_TRANSFORM) {
builder.SetInTransform(true);
}
if (aFlags & PAINT_SYNC_DECODE_IMAGES) {
builder.SetSyncDecodeImages(true);
}
if (aFlags & (PAINT_WIDGET_LAYERS | PAINT_TO_WINDOW)) {
builder.SetPaintingToWindow(true);
}
if (aFlags & PAINT_IGNORE_SUPPRESSION) {
builder.IgnorePaintSuppression();
}
// Windowed plugins aren't allowed in popups
if ((aFlags & PAINT_WIDGET_LAYERS) &&
!willFlushRetainedLayers &&
!(aFlags & PAINT_DOCUMENT_RELATIVE) &&
rootPresContext->NeedToComputePluginGeometryUpdates()) {
builder.SetWillComputePluginGeometry(true);
}
nsRect canvasArea(nsPoint(0, 0), aFrame->GetSize());
bool ignoreViewportScrolling =
aFrame->GetParent() ? false : presShell->IgnoringViewportScrolling();
if (ignoreViewportScrolling && rootScrollFrame) {
nsIScrollableFrame* rootScrollableFrame =
presShell->GetRootScrollFrameAsScrollable();
if (aFlags & PAINT_DOCUMENT_RELATIVE) {
// Make visibleRegion and aRenderingContext relative to the
// scrolled frame instead of the root frame.
nsPoint pos = rootScrollableFrame->GetScrollPosition();
visibleRegion.MoveBy(-pos);
if (aRenderingContext) {
aRenderingContext->Translate(pos);
}
}
builder.SetIgnoreScrollFrame(rootScrollFrame);
nsCanvasFrame* canvasFrame =
do_QueryFrame(rootScrollableFrame->GetScrolledFrame());
if (canvasFrame) {
// Use UnionRect here to ensure that areas where the scrollbars
// were are still filled with the background color.
canvasArea.UnionRect(canvasArea,
canvasFrame->CanvasArea() + builder.ToReferenceFrame(canvasFrame));
}
}
nsRect dirtyRect = visibleRegion.GetBounds();
builder.EnterPresShell(aFrame, dirtyRect);
{
PROFILER_LABEL("nsLayoutUtils","PaintFrame::BuildDisplayList");
aFrame->BuildDisplayListForStackingContext(&builder, dirtyRect, &list);
}
const bool paintAllContinuations = aFlags & PAINT_ALL_CONTINUATIONS;
NS_ASSERTION(!paintAllContinuations || !aFrame->GetPrevContinuation(),
"If painting all continuations, the frame must be "
"first-continuation");
nsIAtom* frameType = aFrame->GetType();
if (paintAllContinuations) {
nsIFrame* currentFrame = aFrame;
while ((currentFrame = currentFrame->GetNextContinuation()) != nullptr) {
PROFILER_LABEL("nsLayoutUtils","PaintFrame::ContinuationsBuildDisplayList");
nsRect frameDirty = dirtyRect - builder.ToReferenceFrame(currentFrame);
currentFrame->BuildDisplayListForStackingContext(&builder,
frameDirty, &list);
}
}
// For the viewport frame in print preview/page layout we want to paint
// the grey background behind the page, not the canvas color.
if (frameType == nsGkAtoms::viewportFrame &&
nsLayoutUtils::NeedsPrintPreviewBackground(presContext)) {
nsRect bounds = nsRect(builder.ToReferenceFrame(aFrame),
aFrame->GetSize());
presShell->AddPrintPreviewBackgroundItem(builder, list, aFrame, bounds);
} else if (frameType != nsGkAtoms::pageFrame) {
// For printing, this function is first called on an nsPageFrame, which
// creates a display list with a PageContent item. The PageContent item's
// paint function calls this function on the nsPageFrame's child which is
// an nsPageContentFrame. We only want to add the canvas background color
// item once, for the nsPageContentFrame.
// Add the canvas background color to the bottom of the list. This
// happens after we've built the list so that AddCanvasBackgroundColorItem
// can monkey with the contents if necessary.
canvasArea.IntersectRect(canvasArea, visibleRegion.GetBounds());
presShell->AddCanvasBackgroundColorItem(
builder, list, aFrame, canvasArea, aBackstop);
// If the passed in backstop color makes us draw something different from
// normal, we need to flush layers.
if ((aFlags & PAINT_WIDGET_LAYERS) && !willFlushRetainedLayers) {
nsView* view = aFrame->GetView();
if (view) {
nscolor backstop = presShell->ComputeBackstopColor(view);
// The PresShell's canvas background color doesn't get updated until
// EnterPresShell, so this check has to be done after that.
nscolor canvasColor = presShell->GetCanvasBackground();
if (NS_ComposeColors(aBackstop, canvasColor) !=
NS_ComposeColors(backstop, canvasColor)) {
willFlushRetainedLayers = true;
}
}
}
}
builder.LeavePresShell(aFrame, dirtyRect);
if (builder.GetHadToIgnorePaintSuppression()) {
willFlushRetainedLayers = true;
}
#ifdef MOZ_DUMP_PAINTING
FILE* savedDumpFile = gfxUtils::sDumpPaintFile;
if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting) {
if (gfxUtils::sDumpPaintingToFile) {
nsCString string("dump-");
string.AppendInt(gPaintCount);
string.Append(".html");
gfxUtils::sDumpPaintFile = fopen(string.BeginReading(), "w");
} else {
gfxUtils::sDumpPaintFile = stderr;
}
if (gfxUtils::sDumpPaintingToFile) {
fprintf_stderr(gfxUtils::sDumpPaintFile, "<html><head><script>var array = {}; function ViewImage(index) { window.location = array[index]; }</script></head><body>");
}
fprintf_stderr(gfxUtils::sDumpPaintFile, "Painting --- before optimization (dirty %d,%d,%d,%d):\n",
dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height);
nsFrame::PrintDisplayList(&builder, list, gfxUtils::sDumpPaintFile, gfxUtils::sDumpPaintingToFile);
if (gfxUtils::sDumpPaintingToFile) {
fprintf_stderr(gfxUtils::sDumpPaintFile, "<script>");
}
}
#endif
list.ComputeVisibilityForRoot(&builder, &visibleRegion,
usingDisplayPort ? rootScrollFrame : nullptr);
uint32_t flags = nsDisplayList::PAINT_DEFAULT;
if (aFlags & PAINT_WIDGET_LAYERS) {
flags |= nsDisplayList::PAINT_USE_WIDGET_LAYERS;
if (willFlushRetainedLayers) {
// The caller wanted to paint from retained layers, but set up
// the paint in such a way that we can't use them. We're going
// to display something different from what we'd normally paint
// in a window, so make sure we flush out any retained layer
// trees before *and after* we draw. Callers should be fixed to
// not do this.
NS_WARNING("Flushing retained layers!");
flags |= nsDisplayList::PAINT_FLUSH_LAYERS;
} else if (!(aFlags & PAINT_DOCUMENT_RELATIVE)) {
nsIWidget *widget = aFrame->GetNearestWidget();
if (widget) {
builder.SetFinalTransparentRegion(visibleRegion);
// If we're finished building display list items for painting of the outermost
// pres shell, notify the widget about any toolbars we've encountered.
widget->UpdateThemeGeometries(builder.GetThemeGeometries());
}
}
}
if (aFlags & PAINT_EXISTING_TRANSACTION) {
flags |= nsDisplayList::PAINT_EXISTING_TRANSACTION;
}
if (aFlags & PAINT_NO_COMPOSITE) {
flags |= nsDisplayList::PAINT_NO_COMPOSITE;
}
if (aFlags & PAINT_COMPRESSED) {
flags |= nsDisplayList::PAINT_COMPRESSED;
}
list.PaintRoot(&builder, aRenderingContext, flags);
#ifdef MOZ_DUMP_PAINTING
if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting) {
if (gfxUtils::sDumpPaintingToFile) {
fprintf_stderr(gfxUtils::sDumpPaintFile, "</script>");
}
fprintf_stderr(gfxUtils::sDumpPaintFile, "Painting --- after optimization:\n");
nsFrame::PrintDisplayList(&builder, list, gfxUtils::sDumpPaintFile, gfxUtils::sDumpPaintingToFile);
fprintf_stderr(gfxUtils::sDumpPaintFile, "Painting --- retained layer tree:\n");
nsIWidget* widget = aFrame->GetNearestWidget();
if (widget) {
nsRefPtr<LayerManager> layerManager = widget->GetLayerManager();
if (layerManager) {
FrameLayerBuilder::DumpRetainedLayerTree(layerManager, gfxUtils::sDumpPaintFile,
gfxUtils::sDumpPaintingToFile);
}
}
if (gfxUtils::sDumpPaintingToFile) {
fprintf(gfxUtils::sDumpPaintFile, "</body></html>");
fclose(gfxUtils::sDumpPaintFile);
}
gfxUtils::sDumpPaintFile = savedDumpFile;
gPaintCount++;
}
#endif
// Update the widget's opaque region information. This sets
// glass boundaries on Windows. Also set up plugin clip regions and bounds.
if ((aFlags & PAINT_WIDGET_LAYERS) &&
!willFlushRetainedLayers &&
!(aFlags & PAINT_DOCUMENT_RELATIVE)) {
nsIWidget *widget = aFrame->GetNearestWidget();
if (widget) {
nsRegion excludedRegion = builder.GetExcludedGlassRegion();
excludedRegion.Sub(excludedRegion, visibleRegion);
nsIntRegion windowRegion(excludedRegion.ToNearestPixels(presContext->AppUnitsPerDevPixel()));
widget->UpdateOpaqueRegion(windowRegion);
}
}
if (builder.WillComputePluginGeometry()) {
nsRefPtr<LayerManager> layerManager;
nsIWidget* widget = aFrame->GetNearestWidget();
if (widget) {
layerManager = widget->GetLayerManager();
}
rootPresContext->ComputePluginGeometryUpdates(aFrame, &builder, &list);
// We're not going to get a WillPaintWindow event here if we didn't do
// widget invalidation, so just apply the plugin geometry update here instead.
// We could instead have the compositor send back an equivalent to WillPaintWindow,
// but it should be close enough to now not to matter.
if (layerManager && !layerManager->NeedsWidgetInvalidation()) {
rootPresContext->ApplyPluginGeometryUpdates();
}
// We told the compositor thread not to composite when it received the transaction because
// we wanted to update plugins first. Schedule the composite now.
if (layerManager) {
layerManager->Composite();
}
}
// Flush the list so we don't trigger the IsEmpty-on-destruction assertion
list.DeleteAll();
return NS_OK;
}
/**
* Uses a binary search for find where the cursor falls in the line of text
* It also keeps track of the part of the string that has already been measured
* so it doesn't have to keep measuring the same text over and over
*
* @param "aBaseWidth" contains the width in twips of the portion
* of the text that has already been measured, and aBaseInx contains
* the index of the text that has already been measured.
*
* @param aTextWidth returns the (in twips) the length of the text that falls
* before the cursor aIndex contains the index of the text where the cursor falls
*/
bool
nsLayoutUtils::BinarySearchForPosition(nsRenderingContext* aRendContext,
const char16_t* aText,
int32_t aBaseWidth,
int32_t aBaseInx,
int32_t aStartInx,
int32_t aEndInx,
int32_t aCursorPos,
int32_t& aIndex,
int32_t& aTextWidth)
{
int32_t range = aEndInx - aStartInx;
if ((range == 1) || (range == 2 && NS_IS_HIGH_SURROGATE(aText[aStartInx]))) {
aIndex = aStartInx + aBaseInx;
aTextWidth = aRendContext->GetWidth(aText, aIndex);
return true;
}
int32_t inx = aStartInx + (range / 2);
// Make sure we don't leave a dangling low surrogate
if (NS_IS_HIGH_SURROGATE(aText[inx-1]))
inx++;
int32_t textWidth = aRendContext->GetWidth(aText, inx);
int32_t fullWidth = aBaseWidth + textWidth;
if (fullWidth == aCursorPos) {
aTextWidth = textWidth;
aIndex = inx;
return true;
} else if (aCursorPos < fullWidth) {
aTextWidth = aBaseWidth;
if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, aStartInx, inx, aCursorPos, aIndex, aTextWidth)) {
return true;
}
} else {
aTextWidth = fullWidth;
if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, inx, aEndInx, aCursorPos, aIndex, aTextWidth)) {
return true;
}
}
return false;
}
static void
AddBoxesForFrame(nsIFrame* aFrame,
nsLayoutUtils::BoxCallback* aCallback)
{
nsIAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
if (pseudoType == nsCSSAnonBoxes::tableOuter) {
AddBoxesForFrame(aFrame->GetFirstPrincipalChild(), aCallback);
nsIFrame* kid = aFrame->GetFirstChild(nsIFrame::kCaptionList);
if (kid) {
AddBoxesForFrame(kid, aCallback);
}
} else if (pseudoType == nsCSSAnonBoxes::mozAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozAnonymousPositionedBlock ||
pseudoType == nsCSSAnonBoxes::mozMathMLAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
for (nsIFrame* kid = aFrame->GetFirstPrincipalChild(); kid; kid = kid->GetNextSibling()) {
AddBoxesForFrame(kid, aCallback);
}
} else {
aCallback->AddBox(aFrame);
}
}
void
nsLayoutUtils::GetAllInFlowBoxes(nsIFrame* aFrame, BoxCallback* aCallback)
{
while (aFrame) {
AddBoxesForFrame(aFrame, aCallback);
aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
}
}
nsIFrame*
nsLayoutUtils::GetFirstNonAnonymousFrame(nsIFrame* aFrame)
{
while (aFrame) {
nsIAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
if (pseudoType == nsCSSAnonBoxes::tableOuter) {
nsIFrame* f = GetFirstNonAnonymousFrame(aFrame->GetFirstPrincipalChild());
if (f) {
return f;
}
nsIFrame* kid = aFrame->GetFirstChild(nsIFrame::kCaptionList);
if (kid) {
f = GetFirstNonAnonymousFrame(kid);
if (f) {
return f;
}
}
} else if (pseudoType == nsCSSAnonBoxes::mozAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozAnonymousPositionedBlock ||
pseudoType == nsCSSAnonBoxes::mozMathMLAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
for (nsIFrame* kid = aFrame->GetFirstPrincipalChild(); kid; kid = kid->GetNextSibling()) {
nsIFrame* f = GetFirstNonAnonymousFrame(kid);
if (f) {
return f;
}
}
} else {
return aFrame;
}
aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
}
return nullptr;
}
struct BoxToRect : public nsLayoutUtils::BoxCallback {
nsIFrame* mRelativeTo;
nsLayoutUtils::RectCallback* mCallback;
uint32_t mFlags;
BoxToRect(nsIFrame* aRelativeTo, nsLayoutUtils::RectCallback* aCallback,
uint32_t aFlags)
: mRelativeTo(aRelativeTo), mCallback(aCallback), mFlags(aFlags) {}
virtual void AddBox(nsIFrame* aFrame) MOZ_OVERRIDE {
nsRect r;
nsIFrame* outer = nsSVGUtils::GetOuterSVGFrameAndCoveredRegion(aFrame, &r);
if (!outer) {
outer = aFrame;
switch (mFlags & nsLayoutUtils::RECTS_WHICH_BOX_MASK) {
case nsLayoutUtils::RECTS_USE_CONTENT_BOX:
r = aFrame->GetContentRectRelativeToSelf();
break;
case nsLayoutUtils::RECTS_USE_PADDING_BOX:
r = aFrame->GetPaddingRectRelativeToSelf();
break;
case nsLayoutUtils::RECTS_USE_MARGIN_BOX:
r = aFrame->GetMarginRectRelativeToSelf();
break;
default: // Use the border box
r = aFrame->GetRectRelativeToSelf();
}
}
if (mFlags & nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS) {
r = nsLayoutUtils::TransformFrameRectToAncestor(outer, r, mRelativeTo);
} else {
r += outer->GetOffsetTo(mRelativeTo);
}
mCallback->AddRect(r);
}
};
void
nsLayoutUtils::GetAllInFlowRects(nsIFrame* aFrame, nsIFrame* aRelativeTo,
RectCallback* aCallback, uint32_t aFlags)
{
BoxToRect converter(aRelativeTo, aCallback, aFlags);
GetAllInFlowBoxes(aFrame, &converter);
}
nsLayoutUtils::RectAccumulator::RectAccumulator() : mSeenFirstRect(false) {}
void nsLayoutUtils::RectAccumulator::AddRect(const nsRect& aRect) {
mResultRect.UnionRect(mResultRect, aRect);
if (!mSeenFirstRect) {
mSeenFirstRect = true;
mFirstRect = aRect;
}
}
nsLayoutUtils::RectListBuilder::RectListBuilder(DOMRectList* aList)
: mRectList(aList)
{
}
void nsLayoutUtils::RectListBuilder::AddRect(const nsRect& aRect) {
nsRefPtr<DOMRect> rect = new DOMRect(mRectList);
rect->SetLayoutRect(aRect);
mRectList->Append(rect);
}
nsIFrame* nsLayoutUtils::GetContainingBlockForClientRect(nsIFrame* aFrame)
{
return aFrame->PresContext()->PresShell()->GetRootFrame();
}
nsRect
nsLayoutUtils::GetAllInFlowRectsUnion(nsIFrame* aFrame, nsIFrame* aRelativeTo,
uint32_t aFlags) {
RectAccumulator accumulator;
GetAllInFlowRects(aFrame, aRelativeTo, &accumulator, aFlags);
return accumulator.mResultRect.IsEmpty() ? accumulator.mFirstRect
: accumulator.mResultRect;
}
nsRect
nsLayoutUtils::GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
nsIFrame* aFrame,
uint32_t aFlags)
{
const nsStyleText* textStyle = aFrame->StyleText();
if (!textStyle->HasTextShadow())
return aTextAndDecorationsRect;
nsRect resultRect = aTextAndDecorationsRect;
int32_t A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
for (uint32_t i = 0; i < textStyle->mTextShadow->Length(); ++i) {
nsCSSShadowItem* shadow = textStyle->mTextShadow->ShadowAt(i);
nsMargin blur = nsContextBoxBlur::GetBlurRadiusMargin(shadow->mRadius, A2D);
if ((aFlags & EXCLUDE_BLUR_SHADOWS) && blur != nsMargin(0, 0, 0, 0))
continue;
nsRect tmpRect(aTextAndDecorationsRect);
tmpRect.MoveBy(nsPoint(shadow->mXOffset, shadow->mYOffset));
tmpRect.Inflate(blur);
resultRect.UnionRect(resultRect, tmpRect);
}
return resultRect;
}
nsresult
nsLayoutUtils::GetFontMetricsForFrame(const nsIFrame* aFrame,
nsFontMetrics** aFontMetrics,
float aInflation)
{
return nsLayoutUtils::GetFontMetricsForStyleContext(aFrame->StyleContext(),
aFontMetrics,
aInflation);
}
nsresult
nsLayoutUtils::GetFontMetricsForStyleContext(nsStyleContext* aStyleContext,
nsFontMetrics** aFontMetrics,
float aInflation)
{
// pass the user font set object into the device context to pass along to CreateFontGroup
nsPresContext* pc = aStyleContext->PresContext();
gfxUserFontSet* fs = pc->GetUserFontSet();
gfxTextPerfMetrics* tp = pc->GetTextPerfMetrics();
nsFont font = aStyleContext->StyleFont()->mFont;
// We need to not run font.size through floats when it's large since
// doing so would be lossy. Fortunately, in such cases, aInflation is
// guaranteed to be 1.0f.
if (aInflation != 1.0f) {
font.size = NSToCoordRound(font.size * aInflation);
}
return pc->DeviceContext()->GetMetricsFor(
font, aStyleContext->StyleFont()->mLanguage,
fs, tp, *aFontMetrics);
}
nsIFrame*
nsLayoutUtils::FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame)
{
nsIFrame* result = aDescendantFrame;
while (result) {
nsIFrame* parent = result->GetParent();
if (parent == aParent) {
break;
}
// The frame is not an immediate child of aParent so walk up another level
result = parent;
}
return result;
}
nsBlockFrame*
nsLayoutUtils::GetAsBlock(nsIFrame* aFrame)
{
nsBlockFrame* block = do_QueryFrame(aFrame);
return block;
}
nsBlockFrame*
nsLayoutUtils::FindNearestBlockAncestor(nsIFrame* aFrame)
{
nsIFrame* nextAncestor;
for (nextAncestor = aFrame->GetParent(); nextAncestor;
nextAncestor = nextAncestor->GetParent()) {
nsBlockFrame* block = GetAsBlock(nextAncestor);
if (block)
return block;
}
return nullptr;
}
nsIFrame*
nsLayoutUtils::GetNonGeneratedAncestor(nsIFrame* aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT))
return aFrame;
nsIFrame* f = aFrame;
do {
f = GetParentOrPlaceholderFor(f);
} while (f->GetStateBits() & NS_FRAME_GENERATED_CONTENT);
return f;
}
nsIFrame*
nsLayoutUtils::GetParentOrPlaceholderFor(nsIFrame* aFrame)
{
if ((aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
&& !aFrame->GetPrevInFlow()) {
return aFrame->PresContext()->PresShell()->FrameManager()->
GetPlaceholderFrameFor(aFrame);
}
return aFrame->GetParent();
}
nsIFrame*
nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(nsIFrame* aFrame)
{
nsIFrame* f = GetParentOrPlaceholderFor(aFrame);
if (f)
return f;
return GetCrossDocParentFrame(aFrame);
}
nsIFrame*
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(nsIFrame *aFrame)
{
nsIFrame *result = aFrame->GetNextContinuation();
if (result)
return result;
if ((aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) != 0) {
// We only store the ib-split sibling annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
aFrame = aFrame->FirstContinuation();
void* value = aFrame->Properties().Get(nsIFrame::IBSplitSibling());
return static_cast<nsIFrame*>(value);
}
return nullptr;
}
nsIFrame*
nsLayoutUtils::FirstContinuationOrIBSplitSibling(nsIFrame *aFrame)
{
nsIFrame *result = aFrame->FirstContinuation();
if (result->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
while (true) {
nsIFrame *f = static_cast<nsIFrame*>
(result->Properties().Get(nsIFrame::IBSplitPrevSibling()));
if (!f)
break;
result = f;
}
}
return result;
}
bool
nsLayoutUtils::IsFirstContinuationOrIBSplitSibling(nsIFrame *aFrame)
{
if (aFrame->GetPrevContinuation()) {
return false;
}
if ((aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) &&
aFrame->Properties().Get(nsIFrame::IBSplitPrevSibling())) {
return false;
}
return true;
}
bool
nsLayoutUtils::IsViewportScrollbarFrame(nsIFrame* aFrame)
{
if (!aFrame)
return false;
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (!rootScrollFrame)
return false;
nsIScrollableFrame* rootScrollableFrame = do_QueryFrame(rootScrollFrame);
NS_ASSERTION(rootScrollableFrame, "The root scorollable frame is null");
if (!IsProperAncestorFrame(rootScrollFrame, aFrame))
return false;
nsIFrame* rootScrolledFrame = rootScrollableFrame->GetScrolledFrame();
return !(rootScrolledFrame == aFrame ||
IsProperAncestorFrame(rootScrolledFrame, aFrame));
}
static nscoord AddPercents(nsLayoutUtils::IntrinsicWidthType aType,
nscoord aCurrent, float aPercent)
{
nscoord result = aCurrent;
if (aPercent > 0.0f && aType == nsLayoutUtils::PREF_WIDTH) {
// XXX Should we also consider percentages for min widths, up to a
// limit?
if (aPercent >= 1.0f)
result = nscoord_MAX;
else
result = NSToCoordRound(float(result) / (1.0f - aPercent));
}
return result;
}
// Use only for widths/heights (or their min/max), since it clamps
// negative calc() results to 0.
static bool GetAbsoluteCoord(const nsStyleCoord& aStyle, nscoord& aResult)
{
if (aStyle.IsCalcUnit()) {
if (aStyle.CalcHasPercent()) {
return false;
}
// If it has no percents, we can pass 0 for the percentage basis.
aResult = nsRuleNode::ComputeComputedCalc(aStyle, 0);
if (aResult < 0)
aResult = 0;
return true;
}
if (eStyleUnit_Coord != aStyle.GetUnit())
return false;
aResult = aStyle.GetCoordValue();
NS_ASSERTION(aResult >= 0, "negative widths not allowed");
return true;
}
// Only call on style coords for which GetAbsoluteCoord returned false.
static bool
GetPercentHeight(const nsStyleCoord& aStyle,
nsIFrame* aFrame,
nscoord& aResult)
{
if (eStyleUnit_Percent != aStyle.GetUnit() &&
!aStyle.IsCalcUnit())
return false;
MOZ_ASSERT(!aStyle.IsCalcUnit() || aStyle.CalcHasPercent(),
"GetAbsoluteCoord should have handled this");
nsIFrame *f = aFrame->GetContainingBlock();
if (!f) {
NS_NOTREACHED("top of frame tree not a containing block");
return false;
}
// During reflow, nsHTMLScrollFrame::ReflowScrolledFrame uses
// SetComputedHeight on the reflow state for its child to propagate its
// computed height to the scrolled content. So here we skip to the scroll
// frame that contains this scrolled content in order to get the same
// behavior as layout when computing percentage heights.
if (f->StyleContext()->GetPseudo() == nsCSSAnonBoxes::scrolledContent) {
f = f->GetParent();
}
const nsStylePosition *pos = f->StylePosition();
nscoord h;
if (!GetAbsoluteCoord(pos->mHeight, h) &&
!GetPercentHeight(pos->mHeight, f, h)) {
NS_ASSERTION(pos->mHeight.GetUnit() == eStyleUnit_Auto ||
pos->mHeight.HasPercent(),
"unknown height unit");
nsIAtom* fType = f->GetType();
if (fType != nsGkAtoms::viewportFrame && fType != nsGkAtoms::canvasFrame &&
fType != nsGkAtoms::pageContentFrame) {
// There's no basis for the percentage height, so it acts like auto.
// Should we consider a max-height < min-height pair a basis for
// percentage heights? The spec is somewhat unclear, and not doing
// so is simpler and avoids troubling discontinuities in behavior,
// so I'll choose not to. -LDB
return false;
}
NS_ASSERTION(pos->mHeight.GetUnit() == eStyleUnit_Auto,
"Unexpected height unit for viewport or canvas or page-content");
// For the viewport, canvas, and page-content kids, the percentage
// basis is just the parent height.
h = f->GetSize().height;
if (h == NS_UNCONSTRAINEDSIZE) {
// We don't have a percentage basis after all
return false;
}
}
nscoord maxh;
if (GetAbsoluteCoord(pos->mMaxHeight, maxh) ||
GetPercentHeight(pos->mMaxHeight, f, maxh)) {
if (maxh < h)
h = maxh;
} else {
NS_ASSERTION(pos->mMaxHeight.GetUnit() == eStyleUnit_None ||
pos->mMaxHeight.HasPercent(),
"unknown max-height unit");
}
nscoord minh;
if (GetAbsoluteCoord(pos->mMinHeight, minh) ||
GetPercentHeight(pos->mMinHeight, f, minh)) {
if (minh > h)
h = minh;
} else {
NS_ASSERTION(pos->mMinHeight.HasPercent(),
"unknown min-height unit");
}
if (aStyle.IsCalcUnit()) {
aResult = std::max(nsRuleNode::ComputeComputedCalc(aStyle, h), 0);
return true;
}
aResult = NSToCoordRound(aStyle.GetPercentValue() * h);
return true;
}
// Handles only -moz-max-content and -moz-min-content, and
// -moz-fit-content for min-width and max-width, since the others
// (-moz-fit-content for width, and -moz-available) have no effect on
// intrinsic widths.
enum eWidthProperty { PROP_WIDTH, PROP_MAX_WIDTH, PROP_MIN_WIDTH };
static bool
GetIntrinsicCoord(const nsStyleCoord& aStyle,
nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
eWidthProperty aProperty,
nscoord& aResult)
{
NS_PRECONDITION(aProperty == PROP_WIDTH || aProperty == PROP_MAX_WIDTH ||
aProperty == PROP_MIN_WIDTH, "unexpected property");
if (aStyle.GetUnit() != eStyleUnit_Enumerated)
return false;
int32_t val = aStyle.GetIntValue();
NS_ASSERTION(val == NS_STYLE_WIDTH_MAX_CONTENT ||
val == NS_STYLE_WIDTH_MIN_CONTENT ||
val == NS_STYLE_WIDTH_FIT_CONTENT ||
val == NS_STYLE_WIDTH_AVAILABLE,
"unexpected enumerated value for width property");
if (val == NS_STYLE_WIDTH_AVAILABLE)
return false;
if (val == NS_STYLE_WIDTH_FIT_CONTENT) {
if (aProperty == PROP_WIDTH)
return false; // handle like 'width: auto'
if (aProperty == PROP_MAX_WIDTH)
// constrain large 'width' values down to -moz-max-content
val = NS_STYLE_WIDTH_MAX_CONTENT;
else
// constrain small 'width' or 'max-width' values up to -moz-min-content
val = NS_STYLE_WIDTH_MIN_CONTENT;
}
NS_ASSERTION(val == NS_STYLE_WIDTH_MAX_CONTENT ||
val == NS_STYLE_WIDTH_MIN_CONTENT,
"should have reduced everything remaining to one of these");
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
if (val == NS_STYLE_WIDTH_MAX_CONTENT)
aResult = aFrame->GetPrefWidth(aRenderingContext);
else
aResult = aFrame->GetMinWidth(aRenderingContext);
return true;
}
#undef DEBUG_INTRINSIC_WIDTH
#ifdef DEBUG_INTRINSIC_WIDTH
static int32_t gNoiseIndent = 0;
#endif
/* static */ nscoord
nsLayoutUtils::IntrinsicForContainer(nsRenderingContext *aRenderingContext,
nsIFrame *aFrame,
IntrinsicWidthType aType,
uint32_t aFlags)
{
NS_PRECONDITION(aFrame, "null frame");
NS_PRECONDITION(aType == MIN_WIDTH || aType == PREF_WIDTH, "bad type");
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s intrinsic width for container:\n",
aType == MIN_WIDTH ? "min" : "pref");
#endif
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
nsIFrame::IntrinsicWidthOffsetData offsets =
aFrame->IntrinsicWidthOffsets(aRenderingContext);
const nsStylePosition *stylePos = aFrame->StylePosition();
uint8_t boxSizing = stylePos->mBoxSizing;
const nsStyleCoord &styleWidth = stylePos->mWidth;
const nsStyleCoord &styleMinWidth = stylePos->mMinWidth;
const nsStyleCoord &styleMaxWidth = stylePos->mMaxWidth;
// We build up two values starting with the content box, and then
// adding padding, border and margin. The result is normally
// |result|. Then, when we handle 'width', 'min-width', and
// 'max-width', we use the results we've been building in |min| as a
// minimum, overriding 'min-width'. This ensures two things:
// * that we don't let a value of 'box-sizing' specifying a width
// smaller than the padding/border inside the box-sizing box give
// a content width less than zero
// * that we prevent tables from becoming smaller than their
// intrinsic minimum width
nscoord result = 0, min = 0;
nscoord maxw;
bool haveFixedMaxWidth = GetAbsoluteCoord(styleMaxWidth, maxw);
nscoord minw;
bool haveFixedMinWidth = GetAbsoluteCoord(styleMinWidth, minw);
// If we have a specified width (or a specified 'min-width' greater
// than the specified 'max-width', which works out to the same thing),
// don't even bother getting the frame's intrinsic width, because in
// this case GetAbsoluteCoord(styleWidth, w) will always succeed, so
// we'll never need the intrinsic dimensions.
if (styleWidth.GetUnit() == eStyleUnit_Enumerated &&
(styleWidth.GetIntValue() == NS_STYLE_WIDTH_MAX_CONTENT ||
styleWidth.GetIntValue() == NS_STYLE_WIDTH_MIN_CONTENT)) {
// -moz-fit-content and -moz-available enumerated widths compute intrinsic
// widths just like auto.
// For -moz-max-content and -moz-min-content, we handle them like
// specified widths, but ignore box-sizing.
boxSizing = NS_STYLE_BOX_SIZING_CONTENT;
} else if (!styleWidth.ConvertsToLength() &&
!(haveFixedMinWidth && haveFixedMaxWidth && maxw <= minw)) {
#ifdef DEBUG_INTRINSIC_WIDTH
++gNoiseIndent;
#endif
if (aType == MIN_WIDTH)
result = aFrame->GetMinWidth(aRenderingContext);
else
result = aFrame->GetPrefWidth(aRenderingContext);
#ifdef DEBUG_INTRINSIC_WIDTH
--gNoiseIndent;
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s intrinsic width from frame is %d.\n",
aType == MIN_WIDTH ? "min" : "pref", result);
#endif
// Handle elements with an intrinsic ratio (or size) and a specified
// height, min-height, or max-height.
const nsStyleCoord &styleHeight = stylePos->mHeight;
const nsStyleCoord &styleMinHeight = stylePos->mMinHeight;
const nsStyleCoord &styleMaxHeight = stylePos->mMaxHeight;
if (styleHeight.GetUnit() != eStyleUnit_Auto ||
!(styleMinHeight.GetUnit() == eStyleUnit_Coord &&
styleMinHeight.GetCoordValue() == 0) ||
styleMaxHeight.GetUnit() != eStyleUnit_None) {
nsSize ratio = aFrame->GetIntrinsicRatio();
if (ratio.height != 0) {
nscoord heightTakenByBoxSizing = 0;
switch (boxSizing) {
case NS_STYLE_BOX_SIZING_BORDER: {
const nsStyleBorder* styleBorder = aFrame->StyleBorder();
heightTakenByBoxSizing +=
styleBorder->GetComputedBorder().TopBottom();
// fall through
}
case NS_STYLE_BOX_SIZING_PADDING: {
if (!(aFlags & IGNORE_PADDING)) {
const nsStylePadding* stylePadding = aFrame->StylePadding();
nscoord pad;
if (GetAbsoluteCoord(stylePadding->mPadding.GetTop(), pad) ||
GetPercentHeight(stylePadding->mPadding.GetTop(), aFrame, pad)) {
heightTakenByBoxSizing += pad;
}
if (GetAbsoluteCoord(stylePadding->mPadding.GetBottom(), pad) ||
GetPercentHeight(stylePadding->mPadding.GetBottom(), aFrame, pad)) {
heightTakenByBoxSizing += pad;
}
}
// fall through
}
case NS_STYLE_BOX_SIZING_CONTENT:
default:
break;
}
nscoord h;
if (GetAbsoluteCoord(styleHeight, h) ||
GetPercentHeight(styleHeight, aFrame, h)) {
h = std::max(0, h - heightTakenByBoxSizing);
result =
NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
}
if (GetAbsoluteCoord(styleMaxHeight, h) ||
GetPercentHeight(styleMaxHeight, aFrame, h)) {
h = std::max(0, h - heightTakenByBoxSizing);
nscoord maxWidth =
NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
if (maxWidth < result)
result = maxWidth;
}
if (GetAbsoluteCoord(styleMinHeight, h) ||
GetPercentHeight(styleMinHeight, aFrame, h)) {
h = std::max(0, h - heightTakenByBoxSizing);
nscoord minWidth =
NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
if (minWidth > result)
result = minWidth;
}
}
}
}
if (aFrame->GetType() == nsGkAtoms::tableFrame) {
// Tables can't shrink smaller than their intrinsic minimum width,
// no matter what.
min = aFrame->GetMinWidth(aRenderingContext);
}
// We also need to track what has been added on outside of the box
// (controlled by 'box-sizing') where 'width', 'min-width' and
// 'max-width' are applied. We have to account for these properties
// after getting all the offsets (margin, border, padding) because
// percentages do not operate linearly.
// Doing this is ok because although percentages aren't handled
// linearly, they are handled monotonically.
nscoord coordOutsideWidth = 0;
float pctOutsideWidth = 0;
float pctTotal = 0.0f;
if (!(aFlags & IGNORE_PADDING)) {
coordOutsideWidth += offsets.hPadding;
pctOutsideWidth += offsets.hPctPadding;
if (boxSizing == NS_STYLE_BOX_SIZING_PADDING) {
min += coordOutsideWidth;
result = NSCoordSaturatingAdd(result, coordOutsideWidth);
pctTotal += pctOutsideWidth;
coordOutsideWidth = 0;
pctOutsideWidth = 0.0f;
}
}
coordOutsideWidth += offsets.hBorder;
if (boxSizing == NS_STYLE_BOX_SIZING_BORDER) {
min += coordOutsideWidth;
result = NSCoordSaturatingAdd(result, coordOutsideWidth);
pctTotal += pctOutsideWidth;
coordOutsideWidth = 0;
pctOutsideWidth = 0.0f;
}
coordOutsideWidth += offsets.hMargin;
pctOutsideWidth += offsets.hPctMargin;
min += coordOutsideWidth;
result = NSCoordSaturatingAdd(result, coordOutsideWidth);
pctTotal += pctOutsideWidth;
nscoord w;
if (GetAbsoluteCoord(styleWidth, w) ||
GetIntrinsicCoord(styleWidth, aRenderingContext, aFrame,
PROP_WIDTH, w)) {
result = AddPercents(aType, w + coordOutsideWidth, pctOutsideWidth);
}
else if (aType == MIN_WIDTH &&
// The only cases of coord-percent-calc() units that
// GetAbsoluteCoord didn't handle are percent and calc()s
// containing percent.
styleWidth.IsCoordPercentCalcUnit() &&
aFrame->IsFrameOfType(nsIFrame::eReplaced)) {
// A percentage width on replaced elements means they can shrink to 0.
result = 0; // let |min| handle padding/border/margin
}
else {
// NOTE: We could really do a lot better for percents and for some
// cases of calc() containing percent (certainly including any where
// the coefficient on the percent is positive and there are no max()
// expressions). However, doing better for percents wouldn't be
// backwards compatible.
result = AddPercents(aType, result, pctTotal);
}
if (haveFixedMaxWidth ||
GetIntrinsicCoord(styleMaxWidth, aRenderingContext, aFrame,
PROP_MAX_WIDTH, maxw)) {
maxw = AddPercents(aType, maxw + coordOutsideWidth, pctOutsideWidth);
if (result > maxw)
result = maxw;
}
if (haveFixedMinWidth ||
GetIntrinsicCoord(styleMinWidth, aRenderingContext, aFrame,
PROP_MIN_WIDTH, minw)) {
minw = AddPercents(aType, minw + coordOutsideWidth, pctOutsideWidth);
if (result < minw)
result = minw;
}
min = AddPercents(aType, min, pctTotal);
if (result < min)
result = min;
const nsStyleDisplay *disp = aFrame->StyleDisplay();
if (aFrame->IsThemed(disp)) {
nsIntSize size(0, 0);
bool canOverride = true;
nsPresContext *presContext = aFrame->PresContext();
presContext->GetTheme()->
GetMinimumWidgetSize(aRenderingContext, aFrame, disp->mAppearance,
&size, &canOverride);
nscoord themeWidth = presContext->DevPixelsToAppUnits(size.width);
// GMWS() returns a border-box width
themeWidth += offsets.hMargin;
themeWidth = AddPercents(aType, themeWidth, offsets.hPctMargin);
if (themeWidth > result || !canOverride)
result = themeWidth;
}
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s intrinsic width for container is %d twips.\n",
aType == MIN_WIDTH ? "min" : "pref", result);
#endif
return result;
}
/* static */ nscoord
nsLayoutUtils::ComputeCBDependentValue(nscoord aPercentBasis,
const nsStyleCoord& aCoord)
{
NS_WARN_IF_FALSE(aPercentBasis != NS_UNCONSTRAINEDSIZE,
"have unconstrained width or height; this should only "
"result from very large sizes, not attempts at intrinsic "
"size calculation");
if (aCoord.IsCoordPercentCalcUnit()) {
return nsRuleNode::ComputeCoordPercentCalc(aCoord, aPercentBasis);
}
NS_ASSERTION(aCoord.GetUnit() == eStyleUnit_None ||
aCoord.GetUnit() == eStyleUnit_Auto,
"unexpected width value");
return 0;
}
/* static */ nscoord
nsLayoutUtils::ComputeWidthValue(
nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
nscoord aContainingBlockWidth,
nscoord aContentEdgeToBoxSizing,
nscoord aBoxSizingToMarginEdge,
const nsStyleCoord& aCoord)
{
NS_PRECONDITION(aFrame, "non-null frame expected");
NS_PRECONDITION(aRenderingContext, "non-null rendering context expected");
NS_WARN_IF_FALSE(aContainingBlockWidth != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
NS_PRECONDITION(aContainingBlockWidth >= 0,
"width less than zero");
nscoord result;
if (aCoord.IsCoordPercentCalcUnit()) {
result = nsRuleNode::ComputeCoordPercentCalc(aCoord,
aContainingBlockWidth);
// The result of a calc() expression might be less than 0; we
// should clamp at runtime (below). (Percentages and coords that
// are less than 0 have already been dropped by the parser.)
result -= aContentEdgeToBoxSizing;
} else {
MOZ_ASSERT(eStyleUnit_Enumerated == aCoord.GetUnit());
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
int32_t val = aCoord.GetIntValue();
switch (val) {
case NS_STYLE_WIDTH_MAX_CONTENT:
result = aFrame->GetPrefWidth(aRenderingContext);
NS_ASSERTION(result >= 0, "width less than zero");
break;
case NS_STYLE_WIDTH_MIN_CONTENT:
result = aFrame->GetMinWidth(aRenderingContext);
NS_ASSERTION(result >= 0, "width less than zero");
break;
case NS_STYLE_WIDTH_FIT_CONTENT:
{
nscoord pref = aFrame->GetPrefWidth(aRenderingContext),
min = aFrame->GetMinWidth(aRenderingContext),
fill = aContainingBlockWidth -
(aBoxSizingToMarginEdge + aContentEdgeToBoxSizing);
result = std::max(min, std::min(pref, fill));
NS_ASSERTION(result >= 0, "width less than zero");
}
break;
case NS_STYLE_WIDTH_AVAILABLE:
result = aContainingBlockWidth -
(aBoxSizingToMarginEdge + aContentEdgeToBoxSizing);
}
}
return std::max(0, result);
}
/* static */ nscoord
nsLayoutUtils::ComputeHeightDependentValue(
nscoord aContainingBlockHeight,
const nsStyleCoord& aCoord)
{
// XXXldb Some callers explicitly check aContainingBlockHeight
// against NS_AUTOHEIGHT *and* unit against eStyleUnit_Percent or
// calc()s containing percents before calling this function.
// However, it would be much more likely to catch problems without
// the unit conditions.
// XXXldb Many callers pass a non-'auto' containing block height when
// according to CSS2.1 they should be passing 'auto'.
NS_PRECONDITION(NS_AUTOHEIGHT != aContainingBlockHeight ||
!aCoord.HasPercent(),
"unexpected containing block height");
if (aCoord.IsCoordPercentCalcUnit()) {
return nsRuleNode::ComputeCoordPercentCalc(aCoord, aContainingBlockHeight);
}
NS_ASSERTION(aCoord.GetUnit() == eStyleUnit_None ||
aCoord.GetUnit() == eStyleUnit_Auto,
"unexpected height value");
return 0;
}
/* static */ void
nsLayoutUtils::MarkDescendantsDirty(nsIFrame *aSubtreeRoot)
{
nsAutoTArray<nsIFrame*, 4> subtrees;
subtrees.AppendElement(aSubtreeRoot);
// dirty descendants, iterating over subtrees that may include
// additional subtrees associated with placeholders
do {
nsIFrame *subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
subtrees.RemoveElementAt(subtrees.Length() - 1);
// Mark all descendants dirty (using an nsTArray stack rather than
// recursion).
// Note that nsHTMLReflowState::InitResizeFlags has some similar
// code; see comments there for how and why it differs.
nsAutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(subtreeRoot);
do {
nsIFrame *f = stack.ElementAt(stack.Length() - 1);
stack.RemoveElementAt(stack.Length() - 1);
f->MarkIntrinsicWidthsDirty();
if (f->GetType() == nsGkAtoms::placeholderFrame) {
nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
// We have another distinct subtree we need to mark.
subtrees.AppendElement(oof);
}
}
nsIFrame::ChildListIterator lists(f);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* kid = childFrames.get();
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
} while (subtrees.Length() != 0);
}
#define MULDIV(a,b,c) (nscoord(int64_t(a) * int64_t(b) / int64_t(c)))
/* static */ nsSize
nsLayoutUtils::ComputeSizeWithIntrinsicDimensions(
nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const IntrinsicSize& aIntrinsicSize,
nsSize aIntrinsicRatio, nsSize aCBSize,
nsSize aMargin, nsSize aBorder, nsSize aPadding)
{
const nsStylePosition* stylePos = aFrame->StylePosition();
// If we're a flex item, we'll compute our size a bit differently.
const nsStyleCoord* widthStyleCoord = &(stylePos->mWidth);
const nsStyleCoord* heightStyleCoord = &(stylePos->mHeight);
bool isFlexItem = aFrame->IsFlexItem();
bool isHorizontalFlexItem = false;
if (isFlexItem) {
// Flex items use their "flex-basis" property in place of their main-size
// property (e.g. "width") for sizing purposes, *unless* they have
// "flex-basis:auto", in which case they use their main-size property after
// all.
uint32_t flexDirection =
aFrame->GetParent()->StylePosition()->mFlexDirection;
isHorizontalFlexItem =
flexDirection == NS_STYLE_FLEX_DIRECTION_ROW ||
flexDirection == NS_STYLE_FLEX_DIRECTION_ROW_REVERSE;
// NOTE: The logic here should match the similar chunk for determining
// widthStyleCoord and heightStyleCoord in nsFrame::ComputeSize().
const nsStyleCoord* flexBasis = &(stylePos->mFlexBasis);
if (flexBasis->GetUnit() != eStyleUnit_Auto) {
if (isHorizontalFlexItem) {
widthStyleCoord = flexBasis;
} else {
// One caveat for vertical flex items: We don't support enumerated
// values (e.g. "max-content") for height properties yet. So, if our
// computed flex-basis is an enumerated value, we'll just behave as if
// it were "auto", which means "use the main-size property after all"
// (which is "height", in this case).
// NOTE: Once we support intrinsic sizing keywords for "height",
// we should remove this check.
if (flexBasis->GetUnit() != eStyleUnit_Enumerated) {
heightStyleCoord = flexBasis;
}
}
}
}
// Handle intrinsic sizes and their interaction with
// {min-,max-,}{width,height} according to the rules in
// http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
// Note: throughout the following section of the function, I avoid
// a * (b / c) because of its reduced accuracy relative to a * b / c
// or (a * b) / c (which are equivalent).
const bool isAutoWidth = widthStyleCoord->GetUnit() == eStyleUnit_Auto;
const bool isAutoHeight = IsAutoHeight(*heightStyleCoord, aCBSize.height);
nsSize boxSizingAdjust(0,0);
switch (stylePos->mBoxSizing) {
case NS_STYLE_BOX_SIZING_BORDER:
boxSizingAdjust += aBorder;
// fall through
case NS_STYLE_BOX_SIZING_PADDING:
boxSizingAdjust += aPadding;
}
nscoord boxSizingToMarginEdgeWidth =
aMargin.width + aBorder.width + aPadding.width - boxSizingAdjust.width;
nscoord width, minWidth, maxWidth, height, minHeight, maxHeight;
if (!isAutoWidth) {
width = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
aFrame, aCBSize.width, boxSizingAdjust.width,
boxSizingToMarginEdgeWidth, *widthStyleCoord);
}
if (stylePos->mMaxWidth.GetUnit() != eStyleUnit_None &&
!(isFlexItem && isHorizontalFlexItem)) {
maxWidth = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
aFrame, aCBSize.width, boxSizingAdjust.width,
boxSizingToMarginEdgeWidth, stylePos->mMaxWidth);
} else {
// NOTE: Flex items ignore their min & max sizing properties in their
// flex container's main-axis. (Those properties get applied later in
// the flexbox algorithm.)
maxWidth = nscoord_MAX;
}
if (!(isFlexItem && isHorizontalFlexItem)) {
minWidth = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
aFrame, aCBSize.width, boxSizingAdjust.width,
boxSizingToMarginEdgeWidth, stylePos->mMinWidth);
} else {
// NOTE: Flex items ignore their min & max sizing properties in their
// flex container's main-axis. (Those properties get applied later in
// the flexbox algorithm.)
minWidth = 0;
}
if (!isAutoHeight) {
height = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
boxSizingAdjust.height,
*heightStyleCoord);
}
if (!IsAutoHeight(stylePos->mMaxHeight, aCBSize.height) &&
!(isFlexItem && !isHorizontalFlexItem)) {
maxHeight = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
boxSizingAdjust.height,
stylePos->mMaxHeight);
} else {
maxHeight = nscoord_MAX;
}
if (!IsAutoHeight(stylePos->mMinHeight, aCBSize.height) &&
!(isFlexItem && !isHorizontalFlexItem)) {
minHeight = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
boxSizingAdjust.height,
stylePos->mMinHeight);
} else {
minHeight = 0;
}
// Resolve percentage intrinsic width/height as necessary:
NS_ASSERTION(aCBSize.width != NS_UNCONSTRAINEDSIZE,
"Our containing block must not have unconstrained width!");
bool hasIntrinsicWidth, hasIntrinsicHeight;
nscoord intrinsicWidth, intrinsicHeight;
if (aIntrinsicSize.width.GetUnit() == eStyleUnit_Coord) {
hasIntrinsicWidth = true;
intrinsicWidth = aIntrinsicSize.width.GetCoordValue();
if (intrinsicWidth < 0)
intrinsicWidth = 0;
} else {
NS_ASSERTION(aIntrinsicSize.width.GetUnit() == eStyleUnit_None,
"unexpected unit");
hasIntrinsicWidth = false;
intrinsicWidth = 0;
}
if (aIntrinsicSize.height.GetUnit() == eStyleUnit_Coord) {
hasIntrinsicHeight = true;
intrinsicHeight = aIntrinsicSize.height.GetCoordValue();
if (intrinsicHeight < 0)
intrinsicHeight = 0;
} else {
NS_ASSERTION(aIntrinsicSize.height.GetUnit() == eStyleUnit_None,
"unexpected unit");
hasIntrinsicHeight = false;
intrinsicHeight = 0;
}
NS_ASSERTION(aIntrinsicRatio.width >= 0 && aIntrinsicRatio.height >= 0,
"Intrinsic ratio has a negative component!");
// Now calculate the used values for width and height:
if (isAutoWidth) {
if (isAutoHeight) {
// 'auto' width, 'auto' height
// Get tentative values - CSS 2.1 sections 10.3.2 and 10.6.2:
nscoord tentWidth, tentHeight;
if (hasIntrinsicWidth) {
tentWidth = intrinsicWidth;
} else if (hasIntrinsicHeight && aIntrinsicRatio.height > 0) {
tentWidth = MULDIV(intrinsicHeight, aIntrinsicRatio.width, aIntrinsicRatio.height);
} else if (aIntrinsicRatio.width > 0) {
tentWidth = aCBSize.width - boxSizingToMarginEdgeWidth; // XXX scrollbar?
if (tentWidth < 0) tentWidth = 0;
} else {
tentWidth = nsPresContext::CSSPixelsToAppUnits(300);
}
if (hasIntrinsicHeight) {
tentHeight = intrinsicHeight;
} else if (aIntrinsicRatio.width > 0) {
tentHeight = MULDIV(tentWidth, aIntrinsicRatio.height, aIntrinsicRatio.width);
} else {
tentHeight = nsPresContext::CSSPixelsToAppUnits(150);
}
return ComputeAutoSizeWithIntrinsicDimensions(minWidth, minHeight,
maxWidth, maxHeight,
tentWidth, tentHeight);
} else {
// 'auto' width, non-'auto' height
height = NS_CSS_MINMAX(height, minHeight, maxHeight);
if (aIntrinsicRatio.height > 0) {
width = MULDIV(height, aIntrinsicRatio.width, aIntrinsicRatio.height);
} else if (hasIntrinsicWidth) {
width = intrinsicWidth;
} else {
width = nsPresContext::CSSPixelsToAppUnits(300);
}
width = NS_CSS_MINMAX(width, minWidth, maxWidth);
}
} else {
if (isAutoHeight) {
// non-'auto' width, 'auto' height
width = NS_CSS_MINMAX(width, minWidth, maxWidth);
if (aIntrinsicRatio.width > 0) {
height = MULDIV(width, aIntrinsicRatio.height, aIntrinsicRatio.width);
} else if (hasIntrinsicHeight) {
height = intrinsicHeight;
} else {
height = nsPresContext::CSSPixelsToAppUnits(150);
}
height = NS_CSS_MINMAX(height, minHeight, maxHeight);
} else {
// non-'auto' width, non-'auto' height
width = NS_CSS_MINMAX(width, minWidth, maxWidth);
height = NS_CSS_MINMAX(height, minHeight, maxHeight);
}
}
return nsSize(width, height);
}
nsSize
nsLayoutUtils::ComputeAutoSizeWithIntrinsicDimensions(nscoord minWidth, nscoord minHeight,
nscoord maxWidth, nscoord maxHeight,
nscoord tentWidth, nscoord tentHeight)
{
// Now apply min/max-width/height - CSS 2.1 sections 10.4 and 10.7:
if (minWidth > maxWidth)
maxWidth = minWidth;
if (minHeight > maxHeight)
maxHeight = minHeight;
nscoord heightAtMaxWidth, heightAtMinWidth,
widthAtMaxHeight, widthAtMinHeight;
if (tentWidth > 0) {
heightAtMaxWidth = MULDIV(maxWidth, tentHeight, tentWidth);
if (heightAtMaxWidth < minHeight)
heightAtMaxWidth = minHeight;
heightAtMinWidth = MULDIV(minWidth, tentHeight, tentWidth);
if (heightAtMinWidth > maxHeight)
heightAtMinWidth = maxHeight;
} else {
heightAtMaxWidth = heightAtMinWidth = NS_CSS_MINMAX(tentHeight, minHeight, maxHeight);
}
if (tentHeight > 0) {
widthAtMaxHeight = MULDIV(maxHeight, tentWidth, tentHeight);
if (widthAtMaxHeight < minWidth)
widthAtMaxHeight = minWidth;
widthAtMinHeight = MULDIV(minHeight, tentWidth, tentHeight);
if (widthAtMinHeight > maxWidth)
widthAtMinHeight = maxWidth;
} else {
widthAtMaxHeight = widthAtMinHeight = NS_CSS_MINMAX(tentWidth, minWidth, maxWidth);
}
// The table at http://www.w3.org/TR/CSS21/visudet.html#min-max-widths :
nscoord width, height;
if (tentWidth > maxWidth) {
if (tentHeight > maxHeight) {
if (int64_t(maxWidth) * int64_t(tentHeight) <=
int64_t(maxHeight) * int64_t(tentWidth)) {
width = maxWidth;
height = heightAtMaxWidth;
} else {
width = widthAtMaxHeight;
height = maxHeight;
}
} else {
// This also covers "(w > max-width) and (h < min-height)" since in
// that case (max-width/w < 1), and with (h < min-height):
// max(max-width * h/w, min-height) == min-height
width = maxWidth;
height = heightAtMaxWidth;
}
} else if (tentWidth < minWidth) {
if (tentHeight < minHeight) {
if (int64_t(minWidth) * int64_t(tentHeight) <=
int64_t(minHeight) * int64_t(tentWidth)) {
width = widthAtMinHeight;
height = minHeight;
} else {
width = minWidth;
height = heightAtMinWidth;
}
} else {
// This also covers "(w < min-width) and (h > max-height)" since in
// that case (min-width/w > 1), and with (h > max-height):
// min(min-width * h/w, max-height) == max-height
width = minWidth;
height = heightAtMinWidth;
}
} else {
if (tentHeight > maxHeight) {
width = widthAtMaxHeight;
height = maxHeight;
} else if (tentHeight < minHeight) {
width = widthAtMinHeight;
height = minHeight;
} else {
width = tentWidth;
height = tentHeight;
}
}
return nsSize(width, height);
}
/* static */ nscoord
nsLayoutUtils::MinWidthFromInline(nsIFrame* aFrame,
nsRenderingContext* aRenderingContext)
{
NS_ASSERTION(!aFrame->IsContainerForFontSizeInflation(),
"should not be container for font size inflation");
nsIFrame::InlineMinWidthData data;
DISPLAY_MIN_WIDTH(aFrame, data.prevLines);
aFrame->AddInlineMinWidth(aRenderingContext, &data);
data.ForceBreak(aRenderingContext);
return data.prevLines;
}
/* static */ nscoord
nsLayoutUtils::PrefWidthFromInline(nsIFrame* aFrame,
nsRenderingContext* aRenderingContext)
{
NS_ASSERTION(!aFrame->IsContainerForFontSizeInflation(),
"should not be container for font size inflation");
nsIFrame::InlinePrefWidthData data;
DISPLAY_PREF_WIDTH(aFrame, data.prevLines);
aFrame->AddInlinePrefWidth(aRenderingContext, &data);
data.ForceBreak(aRenderingContext);
return data.prevLines;
}
static nscolor
DarkenColor(nscolor aColor)
{
uint16_t hue, sat, value;
uint8_t alpha;
// convert the RBG to HSV so we can get the lightness (which is the v)
NS_RGB2HSV(aColor, hue, sat, value, alpha);
// The goal here is to send white to black while letting colored
// stuff stay colored... So we adopt the following approach.
// Something with sat = 0 should end up with value = 0. Something
// with a high sat can end up with a high value and it's ok.... At
// the same time, we don't want to make things lighter. Do
// something simple, since it seems to work.
if (value > sat) {
value = sat;
// convert this color back into the RGB color space.
NS_HSV2RGB(aColor, hue, sat, value, alpha);
}
return aColor;
}
// Check whether we should darken text/decoration colors. We need to do this if
// background images and colors are being suppressed, because that means
// light text will not be visible against the (presumed light-colored) background.
static bool
ShouldDarkenColors(nsPresContext* aPresContext)
{
return !aPresContext->GetBackgroundColorDraw() &&
!aPresContext->GetBackgroundImageDraw();
}
nscolor
nsLayoutUtils::GetColor(nsIFrame* aFrame, nsCSSProperty aProperty)
{
nscolor color = aFrame->GetVisitedDependentColor(aProperty);
if (ShouldDarkenColors(aFrame->PresContext())) {
color = DarkenColor(color);
}
return color;
}
gfxFloat
nsLayoutUtils::GetSnappedBaselineY(nsIFrame* aFrame, gfxContext* aContext,
nscoord aY, nscoord aAscent)
{
gfxFloat appUnitsPerDevUnit = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxFloat baseline = gfxFloat(aY) + aAscent;
gfxRect putativeRect(0, baseline/appUnitsPerDevUnit, 1, 1);
if (!aContext->UserToDevicePixelSnapped(putativeRect, true))
return baseline;
return aContext->DeviceToUser(putativeRect.TopLeft()).y * appUnitsPerDevUnit;
}
void
nsLayoutUtils::DrawString(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const char16_t* aString,
int32_t aLength,
nsPoint aPoint,
nsStyleContext* aStyleContext)
{
#ifdef IBMBIDI
nsresult rv = NS_ERROR_FAILURE;
nsPresContext* presContext = aFrame->PresContext();
if (presContext->BidiEnabled()) {
nsBidiLevel level =
nsBidiPresUtils::BidiLevelFromStyle(aStyleContext ?
aStyleContext : aFrame->StyleContext());
rv = nsBidiPresUtils::RenderText(aString, aLength, level,
presContext, *aContext, *aContext,
aPoint.x, aPoint.y);
}
if (NS_FAILED(rv))
#endif // IBMBIDI
{
aContext->SetTextRunRTL(false);
aContext->DrawString(aString, aLength, aPoint.x, aPoint.y);
}
}
nscoord
nsLayoutUtils::GetStringWidth(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const char16_t* aString,
int32_t aLength)
{
#ifdef IBMBIDI
nsPresContext* presContext = aFrame->PresContext();
if (presContext->BidiEnabled()) {
nsBidiLevel level =
nsBidiPresUtils::BidiLevelFromStyle(aFrame->StyleContext());
return nsBidiPresUtils::MeasureTextWidth(aString, aLength,
level, presContext, *aContext);
}
#endif // IBMBIDI
aContext->SetTextRunRTL(false);
return aContext->GetWidth(aString, aLength);
}
/* static */ void
nsLayoutUtils::PaintTextShadow(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const nsRect& aTextRect,
const nsRect& aDirtyRect,
const nscolor& aForegroundColor,
TextShadowCallback aCallback,
void* aCallbackData)
{
const nsStyleText* textStyle = aFrame->StyleText();
if (!textStyle->HasTextShadow())
return;
// Text shadow happens with the last value being painted at the back,
// ie. it is painted first.
gfxContext* aDestCtx = aContext->ThebesContext();
for (uint32_t i = textStyle->mTextShadow->Length(); i > 0; --i) {
nsCSSShadowItem* shadowDetails = textStyle->mTextShadow->ShadowAt(i - 1);
nsPoint shadowOffset(shadowDetails->mXOffset,
shadowDetails->mYOffset);
nscoord blurRadius = std::max(shadowDetails->mRadius, 0);
nsRect shadowRect(aTextRect);
shadowRect.MoveBy(shadowOffset);
nsPresContext* presCtx = aFrame->PresContext();
nsContextBoxBlur contextBoxBlur;
gfxContext* shadowContext = contextBoxBlur.Init(shadowRect, 0, blurRadius,
presCtx->AppUnitsPerDevPixel(),
aDestCtx, aDirtyRect, nullptr);
if (!shadowContext)
continue;
nscolor shadowColor;
if (shadowDetails->mHasColor)
shadowColor = shadowDetails->mColor;
else
shadowColor = aForegroundColor;
// Conjure an nsRenderingContext from a gfxContext for drawing the text
// to blur.
nsRefPtr<nsRenderingContext> renderingContext = new nsRenderingContext();
renderingContext->Init(presCtx->DeviceContext(), shadowContext);
aDestCtx->Save();
aDestCtx->NewPath();
aDestCtx->SetColor(gfxRGBA(shadowColor));
// The callback will draw whatever we want to blur as a shadow.
aCallback(renderingContext, shadowOffset, shadowColor, aCallbackData);
contextBoxBlur.DoPaint();
aDestCtx->Restore();
}
}
/* static */ nscoord
nsLayoutUtils::GetCenteredFontBaseline(nsFontMetrics* aFontMetrics,
nscoord aLineHeight)
{
nscoord fontAscent = aFontMetrics->MaxAscent();
nscoord fontHeight = aFontMetrics->MaxHeight();
nscoord leading = aLineHeight - fontHeight;
return fontAscent + leading/2;
}
/* static */ bool
nsLayoutUtils::GetFirstLineBaseline(const nsIFrame* aFrame, nscoord* aResult)
{
LinePosition position;
if (!GetFirstLinePosition(aFrame, &position))
return false;
*aResult = position.mBaseline;
return true;
}
/* static */ bool
nsLayoutUtils::GetFirstLinePosition(const nsIFrame* aFrame,
LinePosition* aResult)
{
const nsBlockFrame* block = nsLayoutUtils::GetAsBlock(const_cast<nsIFrame*>(aFrame));
if (!block) {
// For the first-line baseline we also have to check for a table, and if
// so, use the baseline of its first row.
nsIAtom* fType = aFrame->GetType();
if (fType == nsGkAtoms::tableOuterFrame) {
aResult->mTop = 0;
aResult->mBaseline = aFrame->GetBaseline();
// This is what we want for the list bullet caller; not sure if
// other future callers will want the same.
aResult->mBottom = aFrame->GetSize().height;
return true;
}
// For first-line baselines, we have to consider scroll frames.
if (fType == nsGkAtoms::scrollFrame) {
nsIScrollableFrame *sFrame = do_QueryFrame(const_cast<nsIFrame*>(aFrame));
if (!sFrame) {
NS_NOTREACHED("not scroll frame");
}
LinePosition kidPosition;
if (GetFirstLinePosition(sFrame->GetScrolledFrame(), &kidPosition)) {
// Consider only the border and padding that contributes to the
// kid's position, not the scrolling, so we get the initial
// position.
*aResult = kidPosition + aFrame->GetUsedBorderAndPadding().top;
return true;
}
return false;
}
if (fType == nsGkAtoms::fieldSetFrame) {
LinePosition kidPosition;
nsIFrame* kid = aFrame->GetFirstPrincipalChild();
// kid might be a legend frame here, but that's ok.
if (GetFirstLinePosition(kid, &kidPosition)) {
*aResult = kidPosition + kid->GetNormalPosition().y;
return true;
}
return false;
}
// No baseline.
return false;
}
for (nsBlockFrame::const_line_iterator line = block->begin_lines(),
line_end = block->end_lines();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame *kid = line->mFirstChild;
LinePosition kidPosition;
if (GetFirstLinePosition(kid, &kidPosition)) {
*aResult = kidPosition + kid->GetNormalPosition().y;
return true;
}
} else {
// XXX Is this the right test? We have some bogus empty lines
// floating around, but IsEmpty is perhaps too weak.
if (line->GetHeight() != 0 || !line->IsEmpty()) {
nscoord top = line->mBounds.y;
aResult->mTop = top;
aResult->mBaseline = top + line->GetAscent();
aResult->mBottom = top + line->GetHeight();
return true;
}
}
}
return false;
}
/* static */ bool
nsLayoutUtils::GetLastLineBaseline(const nsIFrame* aFrame, nscoord* aResult)
{
const nsBlockFrame* block = nsLayoutUtils::GetAsBlock(const_cast<nsIFrame*>(aFrame));
if (!block)
// No baseline. (We intentionally don't descend into scroll frames.)
return false;
for (nsBlockFrame::const_reverse_line_iterator line = block->rbegin_lines(),
line_end = block->rend_lines();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame *kid = line->mFirstChild;
nscoord kidBaseline;
if (GetLastLineBaseline(kid, &kidBaseline)) {
// Ignore relative positioning for baseline calculations
*aResult = kidBaseline + kid->GetNormalPosition().y;
return true;
} else if (kid->GetType() == nsGkAtoms::scrollFrame) {
// Use the bottom of the scroll frame.
// XXX CSS2.1 really doesn't say what to do here.
*aResult = kid->GetNormalPosition().y + kid->GetRect().height;
return true;
}
} else {
// XXX Is this the right test? We have some bogus empty lines
// floating around, but IsEmpty is perhaps too weak.
if (line->GetHeight() != 0 || !line->IsEmpty()) {
*aResult = line->mBounds.y + line->GetAscent();
return true;
}
}
}
return false;
}
static nscoord
CalculateBlockContentBottom(nsBlockFrame* aFrame)
{
NS_PRECONDITION(aFrame, "null ptr");
nscoord contentBottom = 0;
for (nsBlockFrame::line_iterator line = aFrame->begin_lines(),
line_end = aFrame->end_lines();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame* child = line->mFirstChild;
nscoord offset = child->GetNormalPosition().y;
contentBottom = std::max(contentBottom,
nsLayoutUtils::CalculateContentBottom(child) + offset);
}
else {
contentBottom = std::max(contentBottom, line->mBounds.YMost());
}
}
return contentBottom;
}
/* static */ nscoord
nsLayoutUtils::CalculateContentBottom(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "null ptr");
nscoord contentBottom = aFrame->GetRect().height;
// We want scrollable overflow rather than visual because this
// calculation is intended to affect layout.
if (aFrame->GetScrollableOverflowRect().height > contentBottom) {
nsIFrame::ChildListIDs skip(nsIFrame::kOverflowList |
nsIFrame::kExcessOverflowContainersList |
nsIFrame::kOverflowOutOfFlowList);
nsBlockFrame* blockFrame = GetAsBlock(aFrame);
if (blockFrame) {
contentBottom =
std::max(contentBottom, CalculateBlockContentBottom(blockFrame));
skip |= nsIFrame::kPrincipalList;
}
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
if (!skip.Contains(lists.CurrentID())) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
nscoord offset = child->GetNormalPosition().y;
contentBottom = std::max(contentBottom,
CalculateContentBottom(child) + offset);
}
}
}
}
return contentBottom;
}
/* static */ nsIFrame*
nsLayoutUtils::GetClosestLayer(nsIFrame* aFrame)
{
nsIFrame* layer;
for (layer = aFrame; layer; layer = layer->GetParent()) {
if (layer->IsPositioned() ||
(layer->GetParent() &&
layer->GetParent()->GetType() == nsGkAtoms::scrollFrame))
break;
}
if (layer)
return layer;
return aFrame->PresContext()->PresShell()->FrameManager()->GetRootFrame();
}
GraphicsFilter
nsLayoutUtils::GetGraphicsFilterForFrame(nsIFrame* aForFrame)
{
GraphicsFilter defaultFilter = GraphicsFilter::FILTER_GOOD;
nsStyleContext *sc;
if (nsCSSRendering::IsCanvasFrame(aForFrame)) {
nsCSSRendering::FindBackground(aForFrame, &sc);
} else {
sc = aForFrame->StyleContext();
}
switch (sc->StyleSVG()->mImageRendering) {
case NS_STYLE_IMAGE_RENDERING_OPTIMIZESPEED:
return GraphicsFilter::FILTER_FAST;
case NS_STYLE_IMAGE_RENDERING_OPTIMIZEQUALITY:
return GraphicsFilter::FILTER_BEST;
case NS_STYLE_IMAGE_RENDERING_CRISPEDGES:
return GraphicsFilter::FILTER_NEAREST;
default:
return defaultFilter;
}
}
/**
* Given an image being drawn into an appunit coordinate system, and
* a point in that coordinate system, map the point back into image
* pixel space.
* @param aSize the size of the image, in pixels
* @param aDest the rectangle that the image is being mapped into
* @param aPt a point in the same coordinate system as the rectangle
*/
static gfxPoint
MapToFloatImagePixels(const gfxSize& aSize,
const gfxRect& aDest, const gfxPoint& aPt)
{
return gfxPoint(((aPt.x - aDest.X())*aSize.width)/aDest.Width(),
((aPt.y - aDest.Y())*aSize.height)/aDest.Height());
}
/**
* Given an image being drawn into an pixel-based coordinate system, and
* a point in image space, map the point into the pixel-based coordinate
* system.
* @param aSize the size of the image, in pixels
* @param aDest the rectangle that the image is being mapped into
* @param aPt a point in image space
*/
static gfxPoint
MapToFloatUserPixels(const gfxSize& aSize,
const gfxRect& aDest, const gfxPoint& aPt)
{
return gfxPoint(aPt.x*aDest.Width()/aSize.width + aDest.X(),
aPt.y*aDest.Height()/aSize.height + aDest.Y());
}
/* static */ gfxRect
nsLayoutUtils::RectToGfxRect(const nsRect& aRect, int32_t aAppUnitsPerDevPixel)
{
return gfxRect(gfxFloat(aRect.x) / aAppUnitsPerDevPixel,
gfxFloat(aRect.y) / aAppUnitsPerDevPixel,
gfxFloat(aRect.width) / aAppUnitsPerDevPixel,
gfxFloat(aRect.height) / aAppUnitsPerDevPixel);
}
struct SnappedImageDrawingParameters {
// A transform from either device space or user space (depending on mResetCTM)
// to image space
gfxMatrix mUserSpaceToImageSpace;
// A device-space, pixel-aligned rectangle to fill
gfxRect mFillRect;
// A pixel rectangle in tiled image space outside of which gfx should not
// sample (using EXTEND_PAD as necessary)
nsIntRect mSubimage;
// Whether there's anything to draw at all
bool mShouldDraw;
// true iff the CTM of the rendering context needs to be reset to the
// identity matrix before drawing
bool mResetCTM;
SnappedImageDrawingParameters()
: mShouldDraw(false)
, mResetCTM(false)
{}
SnappedImageDrawingParameters(const gfxMatrix& aUserSpaceToImageSpace,
const gfxRect& aFillRect,
const nsIntRect& aSubimage,
bool aResetCTM)
: mUserSpaceToImageSpace(aUserSpaceToImageSpace)
, mFillRect(aFillRect)
, mSubimage(aSubimage)
, mShouldDraw(true)
, mResetCTM(aResetCTM)
{}
};
/**
* Given a set of input parameters, compute certain output parameters
* for drawing an image with the image snapping algorithm.
* See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
*
* @see nsLayoutUtils::DrawImage() for the descriptions of input parameters
*/
static SnappedImageDrawingParameters
ComputeSnappedImageDrawingParameters(gfxContext* aCtx,
int32_t aAppUnitsPerDevPixel,
const nsRect aDest,
const nsRect aFill,
const nsPoint aAnchor,
const nsRect aDirty,
const nsIntSize aImageSize)
{
if (aDest.IsEmpty() || aFill.IsEmpty() || !aImageSize.width || !aImageSize.height)
return SnappedImageDrawingParameters();
gfxRect devPixelDest =
nsLayoutUtils::RectToGfxRect(aDest, aAppUnitsPerDevPixel);
gfxRect devPixelFill =
nsLayoutUtils::RectToGfxRect(aFill, aAppUnitsPerDevPixel);
gfxRect devPixelDirty =
nsLayoutUtils::RectToGfxRect(aDirty, aAppUnitsPerDevPixel);
gfxMatrix currentMatrix = aCtx->CurrentMatrix();
gfxRect fill = devPixelFill;
bool didSnap;
// Snap even if we have a scale in the context. But don't snap if
// we have something that's not translation+scale, or if the scale flips in
// the X or Y direction, because snapped image drawing can't handle that yet.
if (!currentMatrix.HasNonAxisAlignedTransform() &&
currentMatrix.xx > 0.0 && currentMatrix.yy > 0.0 &&
aCtx->UserToDevicePixelSnapped(fill, true)) {
didSnap = true;
if (fill.IsEmpty()) {
return SnappedImageDrawingParameters();
}
} else {
didSnap = false;
fill = devPixelFill;
}
gfxSize imageSize(aImageSize.width, aImageSize.height);
// Compute the set of pixels that would be sampled by an ideal rendering
gfxPoint subimageTopLeft =
MapToFloatImagePixels(imageSize, devPixelDest, devPixelFill.TopLeft());
gfxPoint subimageBottomRight =
MapToFloatImagePixels(imageSize, devPixelDest, devPixelFill.BottomRight());
nsIntRect intSubimage;
intSubimage.MoveTo(NSToIntFloor(subimageTopLeft.x),
NSToIntFloor(subimageTopLeft.y));
intSubimage.SizeTo(NSToIntCeil(subimageBottomRight.x) - intSubimage.x,
NSToIntCeil(subimageBottomRight.y) - intSubimage.y);
// Compute the anchor point and compute final fill rect.
// This code assumes that pixel-based devices have one pixel per
// device unit!
gfxPoint anchorPoint(gfxFloat(aAnchor.x)/aAppUnitsPerDevPixel,
gfxFloat(aAnchor.y)/aAppUnitsPerDevPixel);
gfxPoint imageSpaceAnchorPoint =
MapToFloatImagePixels(imageSize, devPixelDest, anchorPoint);
if (didSnap) {
imageSpaceAnchorPoint.Round();
anchorPoint = imageSpaceAnchorPoint;
anchorPoint = MapToFloatUserPixels(imageSize, devPixelDest, anchorPoint);
anchorPoint = currentMatrix.Transform(anchorPoint);
anchorPoint.Round();
// This form of Transform is safe to call since non-axis-aligned
// transforms wouldn't be snapped.
devPixelDirty = currentMatrix.Transform(devPixelDirty);
}
gfxFloat scaleX = imageSize.width*aAppUnitsPerDevPixel/aDest.width;
gfxFloat scaleY = imageSize.height*aAppUnitsPerDevPixel/aDest.height;
if (didSnap) {
// We'll reset aCTX to the identity matrix before drawing, so we need to
// adjust our scales to match.
scaleX /= currentMatrix.xx;
scaleY /= currentMatrix.yy;
}
gfxFloat translateX = imageSpaceAnchorPoint.x - anchorPoint.x*scaleX;
gfxFloat translateY = imageSpaceAnchorPoint.y - anchorPoint.y*scaleY;
gfxMatrix transform(scaleX, 0, 0, scaleY, translateX, translateY);
gfxRect finalFillRect = fill;
// If the user-space-to-image-space transform is not a straight
// translation by integers, then filtering will occur, and
// restricting the fill rect to the dirty rect would change the values
// computed for edge pixels, which we can't allow.
// Also, if didSnap is false then rounding out 'devPixelDirty' might not
// produce pixel-aligned coordinates, which would also break the values
// computed for edge pixels.
if (didSnap && !transform.HasNonIntegerTranslation()) {
devPixelDirty.RoundOut();
finalFillRect = fill.Intersect(devPixelDirty);
}
if (finalFillRect.IsEmpty())
return SnappedImageDrawingParameters();
return SnappedImageDrawingParameters(transform, finalFillRect, intSubimage,
didSnap);
}
static nsresult
DrawImageInternal(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
const nsIntSize& aImageSize,
const SVGImageContext* aSVGContext,
uint32_t aImageFlags)
{
if (aDest.Contains(aFill)) {
aImageFlags |= imgIContainer::FLAG_CLAMP;
}
int32_t appUnitsPerDevPixel = aRenderingContext->AppUnitsPerDevPixel();
gfxContext* ctx = aRenderingContext->ThebesContext();
SnappedImageDrawingParameters drawingParams =
ComputeSnappedImageDrawingParameters(ctx, appUnitsPerDevPixel, aDest, aFill,
aAnchor, aDirty, aImageSize);
if (!drawingParams.mShouldDraw)
return NS_OK;
gfxContextMatrixAutoSaveRestore saveMatrix(ctx);
if (drawingParams.mResetCTM) {
ctx->IdentityMatrix();
}
aImage->Draw(ctx, aGraphicsFilter, drawingParams.mUserSpaceToImageSpace,
drawingParams.mFillRect, drawingParams.mSubimage, aImageSize,
aSVGContext, imgIContainer::FRAME_CURRENT, aImageFlags);
return NS_OK;
}
/* static */ void
nsLayoutUtils::DrawPixelSnapped(nsRenderingContext* aRenderingContext,
gfxDrawable* aDrawable,
GraphicsFilter aFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty)
{
int32_t appUnitsPerDevPixel = aRenderingContext->AppUnitsPerDevPixel();
gfxContext* ctx = aRenderingContext->ThebesContext();
gfxIntSize drawableSize = aDrawable->Size();
nsIntSize imageSize(drawableSize.width, drawableSize.height);
SnappedImageDrawingParameters drawingParams =
ComputeSnappedImageDrawingParameters(ctx, appUnitsPerDevPixel, aDest, aFill,
aAnchor, aDirty, imageSize);
if (!drawingParams.mShouldDraw)
return;
gfxContextMatrixAutoSaveRestore saveMatrix(ctx);
if (drawingParams.mResetCTM) {
ctx->IdentityMatrix();
}
gfxRect sourceRect =
drawingParams.mUserSpaceToImageSpace.Transform(drawingParams.mFillRect);
gfxRect imageRect(0, 0, imageSize.width, imageSize.height);
gfxRect subimage(drawingParams.mSubimage.x, drawingParams.mSubimage.y,
drawingParams.mSubimage.width, drawingParams.mSubimage.height);
NS_ASSERTION(!sourceRect.Intersect(subimage).IsEmpty(),
"We must be allowed to sample *some* source pixels!");
gfxUtils::DrawPixelSnapped(ctx, aDrawable,
drawingParams.mUserSpaceToImageSpace, subimage,
sourceRect, imageRect, drawingParams.mFillRect,
gfxImageFormat::ARGB32, aFilter);
}
/* static */ nsresult
nsLayoutUtils::DrawSingleUnscaledImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsPoint& aDest,
const nsRect* aDirty,
uint32_t aImageFlags,
const nsRect* aSourceArea)
{
nsIntSize imageSize;
aImage->GetWidth(&imageSize.width);
aImage->GetHeight(&imageSize.height);
NS_ENSURE_TRUE(imageSize.width > 0 && imageSize.height > 0, NS_ERROR_FAILURE);
nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
nsSize size(imageSize.width*appUnitsPerCSSPixel,
imageSize.height*appUnitsPerCSSPixel);
nsRect source;
if (aSourceArea) {
source = *aSourceArea;
} else {
source.SizeTo(size);
}
nsRect dest(aDest - source.TopLeft(), size);
nsRect fill(aDest, source.Size());
// Ensure that only a single image tile is drawn. If aSourceArea extends
// outside the image bounds, we want to honor the aSourceArea-to-aDest
// translation but we don't want to actually tile the image.
fill.IntersectRect(fill, dest);
return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
dest, fill, aDest, aDirty ? *aDirty : dest,
imageSize, nullptr, aImageFlags);
}
/* static */ nsresult
nsLayoutUtils::DrawSingleImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aDirty,
const SVGImageContext* aSVGContext,
uint32_t aImageFlags,
const nsRect* aSourceArea)
{
nsIntSize imageSize;
if (aImage->GetType() == imgIContainer::TYPE_VECTOR) {
// We choose a size for vector images that emulates a raster image which
// is perfectly sized for the destination rect: each pixel in the image
// maps exactly to a single pixel on-screen.
nscoord appUnitsPerDevPx = aRenderingContext->AppUnitsPerDevPixel();
imageSize.width = NSAppUnitsToIntPixels(aDest.width, appUnitsPerDevPx);
imageSize.height = NSAppUnitsToIntPixels(aDest.height, appUnitsPerDevPx);
} else {
// Raster images have an intrinsic size, so we just use that.
aImage->GetWidth(&imageSize.width);
aImage->GetHeight(&imageSize.height);
}
NS_ENSURE_TRUE(imageSize.width > 0 && imageSize.height > 0, NS_ERROR_FAILURE);
nsRect source;
if (aSourceArea) {
source = *aSourceArea;
} else {
nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
source.SizeTo(imageSize.width*appUnitsPerCSSPixel,
imageSize.height*appUnitsPerCSSPixel);
}
nsRect dest = nsLayoutUtils::GetWholeImageDestination(imageSize, source,
aDest);
// Ensure that only a single image tile is drawn. If aSourceArea extends
// outside the image bounds, we want to honor the aSourceArea-to-aDest
// transform but we don't want to actually tile the image.
nsRect fill;
fill.IntersectRect(aDest, dest);
return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter, dest, fill,
fill.TopLeft(), aDirty, imageSize, aSVGContext, aImageFlags);
}
/* static */ void
nsLayoutUtils::ComputeSizeForDrawing(imgIContainer *aImage,
nsIntSize& aImageSize, /*outparam*/
nsSize& aIntrinsicRatio, /*outparam*/
bool& aGotWidth, /*outparam*/
bool& aGotHeight /*outparam*/)
{
aGotWidth = NS_SUCCEEDED(aImage->GetWidth(&aImageSize.width));
aGotHeight = NS_SUCCEEDED(aImage->GetHeight(&aImageSize.height));
bool gotRatio = NS_SUCCEEDED(aImage->GetIntrinsicRatio(&aIntrinsicRatio));
if (!(aGotWidth && aGotHeight) && !gotRatio) {
// We hit an error (say, because the image failed to load or couldn't be
// decoded) and should return zero size.
aGotWidth = aGotHeight = true;
aImageSize = nsIntSize(0, 0);
aIntrinsicRatio = nsSize(0, 0);
}
}
/* static */ nsresult
nsLayoutUtils::DrawBackgroundImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
const nsIntSize& aImageSize,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
uint32_t aImageFlags)
{
PROFILER_LABEL("layout", "nsLayoutUtils::DrawBackgroundImage");
if (UseBackgroundNearestFiltering()) {
aGraphicsFilter = GraphicsFilter::FILTER_NEAREST;
}
return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
aDest, aFill, aAnchor, aDirty,
aImageSize, nullptr, aImageFlags);
}
/* static */ nsresult
nsLayoutUtils::DrawImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
uint32_t aImageFlags)
{
nsIntSize imageSize;
nsSize imageRatio;
bool gotHeight, gotWidth;
ComputeSizeForDrawing(aImage, imageSize, imageRatio, gotWidth, gotHeight);
// XXX Dimensionless images shouldn't fall back to filled-area size -- the
// caller should provide the image size, a la DrawBackgroundImage.
if (gotWidth != gotHeight) {
if (!gotWidth) {
if (imageRatio.height != 0) {
imageSize.width =
NSCoordSaturatingNonnegativeMultiply(imageSize.height,
float(imageRatio.width) /
float(imageRatio.height));
gotWidth = true;
}
} else {
if (imageRatio.width != 0) {
imageSize.height =
NSCoordSaturatingNonnegativeMultiply(imageSize.width,
float(imageRatio.height) /
float(imageRatio.width));
gotHeight = true;
}
}
}
if (!gotWidth) {
imageSize.width = nsPresContext::AppUnitsToIntCSSPixels(aFill.width);
}
if (!gotHeight) {
imageSize.height = nsPresContext::AppUnitsToIntCSSPixels(aFill.height);
}
return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
aDest, aFill, aAnchor, aDirty,
imageSize, nullptr, aImageFlags);
}
/* static */ nsRect
nsLayoutUtils::GetWholeImageDestination(const nsIntSize& aWholeImageSize,
const nsRect& aImageSourceArea,
const nsRect& aDestArea)
{
double scaleX = double(aDestArea.width)/aImageSourceArea.width;
double scaleY = double(aDestArea.height)/aImageSourceArea.height;
nscoord destOffsetX = NSToCoordRound(aImageSourceArea.x*scaleX);
nscoord destOffsetY = NSToCoordRound(aImageSourceArea.y*scaleY);
nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
nscoord wholeSizeX = NSToCoordRound(aWholeImageSize.width*appUnitsPerCSSPixel*scaleX);
nscoord wholeSizeY = NSToCoordRound(aWholeImageSize.height*appUnitsPerCSSPixel*scaleY);
return nsRect(aDestArea.TopLeft() - nsPoint(destOffsetX, destOffsetY),
nsSize(wholeSizeX, wholeSizeY));
}
/* static */ already_AddRefed<imgIContainer>
nsLayoutUtils::OrientImage(imgIContainer* aContainer,
const nsStyleImageOrientation& aOrientation)
{
MOZ_ASSERT(aContainer, "Should have an image container");
nsCOMPtr<imgIContainer> img(aContainer);
if (aOrientation.IsFromImage()) {
img = ImageOps::Orient(img, img->GetOrientation());
} else if (!aOrientation.IsDefault()) {
Angle angle = aOrientation.Angle();
Flip flip = aOrientation.IsFlipped() ? Flip::Horizontal
: Flip::Unflipped;
img = ImageOps::Orient(img, Orientation(angle, flip));
}
return img.forget();
}
static bool NonZeroStyleCoord(const nsStyleCoord& aCoord)
{
if (aCoord.IsCoordPercentCalcUnit()) {
// Since negative results are clamped to 0, check > 0.
return nsRuleNode::ComputeCoordPercentCalc(aCoord, nscoord_MAX) > 0 ||
nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) > 0;
}
return true;
}
/* static */ bool
nsLayoutUtils::HasNonZeroCorner(const nsStyleCorners& aCorners)
{
NS_FOR_CSS_HALF_CORNERS(corner) {
if (NonZeroStyleCoord(aCorners.Get(corner)))
return true;
}
return false;
}
// aCorner is a "full corner" value, i.e. NS_CORNER_TOP_LEFT etc
static bool IsCornerAdjacentToSide(uint8_t aCorner, css::Side aSide)
{
PR_STATIC_ASSERT((int)NS_SIDE_TOP == NS_CORNER_TOP_LEFT);
PR_STATIC_ASSERT((int)NS_SIDE_RIGHT == NS_CORNER_TOP_RIGHT);
PR_STATIC_ASSERT((int)NS_SIDE_BOTTOM == NS_CORNER_BOTTOM_RIGHT);
PR_STATIC_ASSERT((int)NS_SIDE_LEFT == NS_CORNER_BOTTOM_LEFT);
PR_STATIC_ASSERT((int)NS_SIDE_TOP == ((NS_CORNER_TOP_RIGHT - 1)&3));
PR_STATIC_ASSERT((int)NS_SIDE_RIGHT == ((NS_CORNER_BOTTOM_RIGHT - 1)&3));
PR_STATIC_ASSERT((int)NS_SIDE_BOTTOM == ((NS_CORNER_BOTTOM_LEFT - 1)&3));
PR_STATIC_ASSERT((int)NS_SIDE_LEFT == ((NS_CORNER_TOP_LEFT - 1)&3));
return aSide == aCorner || aSide == ((aCorner - 1)&3);
}
/* static */ bool
nsLayoutUtils::HasNonZeroCornerOnSide(const nsStyleCorners& aCorners,
css::Side aSide)
{
PR_STATIC_ASSERT(NS_CORNER_TOP_LEFT_X/2 == NS_CORNER_TOP_LEFT);
PR_STATIC_ASSERT(NS_CORNER_TOP_LEFT_Y/2 == NS_CORNER_TOP_LEFT);
PR_STATIC_ASSERT(NS_CORNER_TOP_RIGHT_X/2 == NS_CORNER_TOP_RIGHT);
PR_STATIC_ASSERT(NS_CORNER_TOP_RIGHT_Y/2 == NS_CORNER_TOP_RIGHT);
PR_STATIC_ASSERT(NS_CORNER_BOTTOM_RIGHT_X/2 == NS_CORNER_BOTTOM_RIGHT);
PR_STATIC_ASSERT(NS_CORNER_BOTTOM_RIGHT_Y/2 == NS_CORNER_BOTTOM_RIGHT);
PR_STATIC_ASSERT(NS_CORNER_BOTTOM_LEFT_X/2 == NS_CORNER_BOTTOM_LEFT);
PR_STATIC_ASSERT(NS_CORNER_BOTTOM_LEFT_Y/2 == NS_CORNER_BOTTOM_LEFT);
NS_FOR_CSS_HALF_CORNERS(corner) {
// corner is a "half corner" value, so dividing by two gives us a
// "full corner" value.
if (NonZeroStyleCoord(aCorners.Get(corner)) &&
IsCornerAdjacentToSide(corner/2, aSide))
return true;
}
return false;
}
/* static */ nsTransparencyMode
nsLayoutUtils::GetFrameTransparency(nsIFrame* aBackgroundFrame,
nsIFrame* aCSSRootFrame) {
if (aCSSRootFrame->StyleDisplay()->mOpacity < 1.0f)
return eTransparencyTransparent;
if (HasNonZeroCorner(aCSSRootFrame->StyleBorder()->mBorderRadius))
return eTransparencyTransparent;
if (aCSSRootFrame->StyleDisplay()->mAppearance == NS_THEME_WIN_GLASS)
return eTransparencyGlass;
if (aCSSRootFrame->StyleDisplay()->mAppearance == NS_THEME_WIN_BORDERLESS_GLASS)
return eTransparencyBorderlessGlass;
nsITheme::Transparency transparency;
if (aCSSRootFrame->IsThemed(&transparency))
return transparency == nsITheme::eTransparent
? eTransparencyTransparent
: eTransparencyOpaque;
// We need an uninitialized window to be treated as opaque because
// doing otherwise breaks window display effects on some platforms,
// specifically Vista. (bug 450322)
if (aBackgroundFrame->GetType() == nsGkAtoms::viewportFrame &&
!aBackgroundFrame->GetFirstPrincipalChild()) {
return eTransparencyOpaque;
}
nsStyleContext* bgSC;
if (!nsCSSRendering::FindBackground(aBackgroundFrame, &bgSC)) {
return eTransparencyTransparent;
}
const nsStyleBackground* bg = bgSC->StyleBackground();
if (NS_GET_A(bg->mBackgroundColor) < 255 ||
// bottom layer's clip is used for the color
bg->BottomLayer().mClip != NS_STYLE_BG_CLIP_BORDER)
return eTransparencyTransparent;
return eTransparencyOpaque;
}
static bool IsPopupFrame(nsIFrame* aFrame)
{
// aFrame is a popup it's the list control frame dropdown for a combobox.
nsIAtom* frameType = aFrame->GetType();
if (frameType == nsGkAtoms::listControlFrame) {
nsListControlFrame* lcf = static_cast<nsListControlFrame*>(aFrame);
return lcf->IsInDropDownMode();
}
// ... or if it's a XUL menupopup frame.
return frameType == nsGkAtoms::menuPopupFrame;
}
/* static */ bool
nsLayoutUtils::IsPopup(nsIFrame* aFrame)
{
// Optimization: the frame can't possibly be a popup if it has no view.
if (!aFrame->HasView()) {
NS_ASSERTION(!IsPopupFrame(aFrame), "popup frame must have a view");
return false;
}
return IsPopupFrame(aFrame);
}
/* static */ nsIFrame*
nsLayoutUtils::GetDisplayRootFrame(nsIFrame* aFrame)
{
// We could use GetRootPresContext() here if the
// NS_FRAME_IN_POPUP frame bit is set.
nsIFrame* f = aFrame;
for (;;) {
if (!f->HasAnyStateBits(NS_FRAME_IN_POPUP)) {
f = f->PresContext()->FrameManager()->GetRootFrame();
} else if (IsPopup(f)) {
return f;
}
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent)
return f;
f = parent;
}
}
/* static */ nsIFrame*
nsLayoutUtils::GetReferenceFrame(nsIFrame* aFrame)
{
nsIFrame *f = aFrame;
for (;;) {
if (f->IsTransformed() || IsPopup(f)) {
return f;
}
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent) {
return f;
}
f = parent;
}
}
/* static */ nsIFrame*
nsLayoutUtils::GetTransformRootFrame(nsIFrame* aFrame)
{
nsIFrame *parent = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
while (parent && parent->Preserves3DChildren()) {
parent = nsLayoutUtils::GetCrossDocParentFrame(parent);
}
return parent;
}
/* static */ uint32_t
nsLayoutUtils::GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
const nsStyleFont* aStyleFont,
const nsStyleText* aStyleText,
nscoord aLetterSpacing)
{
uint32_t result = 0;
if (aLetterSpacing != 0) {
result |= gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES;
}
if (aStyleText->mControlCharacterVisibility == NS_STYLE_CONTROL_CHARACTER_VISIBILITY_HIDDEN) {
result |= gfxTextRunFactory::TEXT_HIDE_CONTROL_CHARACTERS;
}
switch (aStyleContext->StyleSVG()->mTextRendering) {
case NS_STYLE_TEXT_RENDERING_OPTIMIZESPEED:
result |= gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
break;
case NS_STYLE_TEXT_RENDERING_AUTO:
if (aStyleFont->mFont.size <
aStyleContext->PresContext()->GetAutoQualityMinFontSize()) {
result |= gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
}
break;
default:
break;
}
return result;
}
/* static */ void
nsLayoutUtils::GetRectDifferenceStrips(const nsRect& aR1, const nsRect& aR2,
nsRect* aHStrip, nsRect* aVStrip) {
NS_ASSERTION(aR1.TopLeft() == aR2.TopLeft(),
"expected rects at the same position");
nsRect unionRect(aR1.x, aR1.y, std::max(aR1.width, aR2.width),
std::max(aR1.height, aR2.height));
nscoord VStripStart = std::min(aR1.width, aR2.width);
nscoord HStripStart = std::min(aR1.height, aR2.height);
*aVStrip = unionRect;
aVStrip->x += VStripStart;
aVStrip->width -= VStripStart;
*aHStrip = unionRect;
aHStrip->y += HStripStart;
aHStrip->height -= HStripStart;
}
nsDeviceContext*
nsLayoutUtils::GetDeviceContextForScreenInfo(nsPIDOMWindow* aWindow)
{
if (!aWindow) {
return nullptr;
}
nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
while (docShell) {
// Now make sure our size is up to date. That will mean that the device
// context does the right thing on multi-monitor systems when we return it to
// the caller. It will also make sure that our prescontext has been created,
// if we're supposed to have one.
nsCOMPtr<nsPIDOMWindow> win = do_GetInterface(docShell);
if (!win) {
// No reason to go on
return nullptr;
}
win->EnsureSizeUpToDate();
nsRefPtr<nsPresContext> presContext;
docShell->GetPresContext(getter_AddRefs(presContext));
if (presContext) {
nsDeviceContext* context = presContext->DeviceContext();
if (context) {
return context;
}
}
nsCOMPtr<nsIDocShellTreeItem> parentItem;
docShell->GetParent(getter_AddRefs(parentItem));
docShell = do_QueryInterface(parentItem);
}
return nullptr;
}
/* static */ bool
nsLayoutUtils::IsReallyFixedPos(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame->GetParent(),
"IsReallyFixedPos called on frame not in tree");
NS_PRECONDITION(aFrame->StyleDisplay()->mPosition ==
NS_STYLE_POSITION_FIXED,
"IsReallyFixedPos called on non-'position:fixed' frame");
nsIAtom *parentType = aFrame->GetParent()->GetType();
return parentType == nsGkAtoms::viewportFrame ||
parentType == nsGkAtoms::pageContentFrame;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(nsIImageLoadingContent* aElement,
uint32_t aSurfaceFlags,
DrawTarget* aTarget)
{
SurfaceFromElementResult result;
nsresult rv;
nsCOMPtr<imgIRequest> imgRequest;
rv = aElement->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
if (NS_FAILED(rv) || !imgRequest)
return result;
uint32_t status;
imgRequest->GetImageStatus(&status);
if ((status & imgIRequest::STATUS_LOAD_COMPLETE) == 0) {
// Spec says to use GetComplete, but that only works on
// nsIDOMHTMLImageElement, and we support all sorts of other stuff
// here. Do this for now pending spec clarification.
result.mIsStillLoading = (status & imgIRequest::STATUS_ERROR) == 0;
return result;
}
nsCOMPtr<nsIPrincipal> principal;
rv = imgRequest->GetImagePrincipal(getter_AddRefs(principal));
if (NS_FAILED(rv))
return result;
nsCOMPtr<imgIContainer> imgContainer;
rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
if (NS_FAILED(rv))
return result;
uint32_t noRasterize = aSurfaceFlags & SFE_NO_RASTERIZING_VECTORS;
uint32_t whichFrame = (aSurfaceFlags & SFE_WANT_FIRST_FRAME)
? (uint32_t) imgIContainer::FRAME_FIRST
: (uint32_t) imgIContainer::FRAME_CURRENT;
uint32_t frameFlags = imgIContainer::FLAG_SYNC_DECODE;
if (aSurfaceFlags & SFE_NO_COLORSPACE_CONVERSION)
frameFlags |= imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION;
if (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA)
frameFlags |= imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA;
int32_t imgWidth, imgHeight;
rv = imgContainer->GetWidth(&imgWidth);
nsresult rv2 = imgContainer->GetHeight(&imgHeight);
if (NS_FAILED(rv) || NS_FAILED(rv2))
return result;
if (!noRasterize || imgContainer->GetType() == imgIContainer::TYPE_RASTER) {
bool wantImageSurface = (aSurfaceFlags & SFE_WANT_IMAGE_SURFACE) != 0;
if (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA) {
wantImageSurface = true;
}
nsRefPtr<gfxASurface> gfxsurf =
imgContainer->GetFrame(whichFrame, frameFlags);
if (!gfxsurf)
return result;
if (wantImageSurface) {
IntSize size(imgWidth, imgHeight);
RefPtr<DataSourceSurface> output = Factory::CreateDataSourceSurface(size, SurfaceFormat::B8G8R8A8);
RefPtr<DrawTarget> dt = Factory::CreateDrawTargetForData(BackendType::CAIRO,
output->GetData(),
size,
output->Stride(),
SurfaceFormat::B8G8R8A8);
RefPtr<SourceSurface> source = gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(dt, gfxsurf);
dt->CopySurface(source, IntRect(0, 0, imgWidth, imgHeight), IntPoint());
dt->Flush();
result.mSourceSurface = output;
} else {
result.mSourceSurface = gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTarget, gfxsurf);
}
} else {
result.mDrawInfo.mImgContainer = imgContainer;
result.mDrawInfo.mWhichFrame = whichFrame;
result.mDrawInfo.mDrawingFlags = frameFlags;
}
int32_t corsmode;
if (NS_SUCCEEDED(imgRequest->GetCORSMode(&corsmode))) {
result.mCORSUsed = (corsmode != imgIRequest::CORS_NONE);
}
result.mSize = gfxIntSize(imgWidth, imgHeight);
result.mPrincipal = principal.forget();
// no images, including SVG images, can load content from another domain.
result.mIsWriteOnly = false;
result.mImageRequest = imgRequest.forget();
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLImageElement *aElement,
uint32_t aSurfaceFlags,
DrawTarget* aTarget)
{
return SurfaceFromElement(static_cast<nsIImageLoadingContent*>(aElement),
aSurfaceFlags, aTarget);
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLCanvasElement* aElement,
uint32_t aSurfaceFlags,
DrawTarget* aTarget)
{
SurfaceFromElementResult result;
nsresult rv;
bool premultAlpha = (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA) == 0;
gfxIntSize size = aElement->GetSize();
if (premultAlpha && aElement->CountContexts() == 1) {
nsICanvasRenderingContextInternal *srcCanvas = aElement->GetContextAtIndex(0);
result.mSourceSurface = srcCanvas->GetSurfaceSnapshot();
}
if (!result.mSourceSurface) {
nsRefPtr<gfxContext> ctx;
RefPtr<DrawTarget> dt;
if (premultAlpha) {
if (aTarget) {
dt = aTarget->CreateSimilarDrawTarget(IntSize(size.width, size.height), SurfaceFormat::B8G8R8A8);
} else {
dt = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(IntSize(size.width, size.height),
SurfaceFormat::B8G8R8A8);
}
if (!dt) {
return result;
}
ctx = new gfxContext(dt);
} else {
// TODO: RenderContextsExternal expects to get a gfxImageFormat
// so that it can un-premultiply.
RefPtr<DataSourceSurface> data = Factory::CreateDataSourceSurface(IntSize(size.width, size.height),
SurfaceFormat::B8G8R8A8);
memset(data->GetData(), 0, data->Stride() * size.height);
result.mSourceSurface = data;
nsRefPtr<gfxImageSurface> image = new gfxImageSurface(data->GetData(),
gfxIntSize(size.width, size.height),
data->Stride(),
gfxImageFormat::ARGB32);
ctx = new gfxContext(image);
}
// XXX shouldn't use the external interface, but maybe we can layerify this
uint32_t flags = premultAlpha ? HTMLCanvasElement::RenderFlagPremultAlpha : 0;
rv = aElement->RenderContextsExternal(ctx, GraphicsFilter::FILTER_NEAREST, flags);
if (NS_FAILED(rv))
return result;
if (premultAlpha) {
result.mSourceSurface = dt->Snapshot();
}
}
// Ensure that any future changes to the canvas trigger proper invalidation,
// in case this is being used by -moz-element()
aElement->MarkContextClean();
result.mSize = size;
result.mPrincipal = aElement->NodePrincipal();
result.mIsWriteOnly = aElement->IsWriteOnly();
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLVideoElement* aElement,
uint32_t aSurfaceFlags,
DrawTarget* aTarget)
{
SurfaceFromElementResult result;
NS_WARN_IF_FALSE((aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA) == 0, "We can't support non-premultiplied alpha for video!");
uint16_t readyState;
if (NS_SUCCEEDED(aElement->GetReadyState(&readyState)) &&
(readyState == nsIDOMHTMLMediaElement::HAVE_NOTHING ||
readyState == nsIDOMHTMLMediaElement::HAVE_METADATA)) {
result.mIsStillLoading = true;
return result;
}
// If it doesn't have a principal, just bail
nsCOMPtr<nsIPrincipal> principal = aElement->GetCurrentPrincipal();
if (!principal)
return result;
ImageContainer *container = aElement->GetImageContainer();
if (!container)
return result;
mozilla::gfx::IntSize size;
result.mSourceSurface = container->GetCurrentAsSourceSurface(&size);
if (!result.mSourceSurface)
return result;
result.mCORSUsed = aElement->GetCORSMode() != CORS_NONE;
result.mSize = ThebesIntSize(size);
result.mPrincipal = principal.forget();
result.mIsWriteOnly = false;
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(dom::Element* aElement,
uint32_t aSurfaceFlags,
DrawTarget* aTarget)
{
// If it's a <canvas>, we may be able to just grab its internal surface
if (HTMLCanvasElement* canvas =
HTMLCanvasElement::FromContentOrNull(aElement)) {
return SurfaceFromElement(canvas, aSurfaceFlags, aTarget);
}
// Maybe it's <video>?
if (HTMLVideoElement* video =
HTMLVideoElement::FromContentOrNull(aElement)) {
return SurfaceFromElement(video, aSurfaceFlags, aTarget);
}
// Finally, check if it's a normal image
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(aElement);
if (!imageLoader) {
return SurfaceFromElementResult();
}
return SurfaceFromElement(imageLoader, aSurfaceFlags, aTarget);
}
/* static */
nsIContent*
nsLayoutUtils::GetEditableRootContentByContentEditable(nsIDocument* aDocument)
{
// If the document is in designMode we should return nullptr.
if (!aDocument || aDocument->HasFlag(NODE_IS_EDITABLE)) {
return nullptr;
}
// contenteditable only works with HTML document.
// Note: Use nsIDOMHTMLDocument rather than nsIHTMLDocument for getting the
// body node because nsIDOMHTMLDocument::GetBody() does something
// additional work for some cases and nsEditor uses them.
nsCOMPtr<nsIDOMHTMLDocument> domHTMLDoc = do_QueryInterface(aDocument);
if (!domHTMLDoc) {
return nullptr;
}
Element* rootElement = aDocument->GetRootElement();
if (rootElement && rootElement->IsEditable()) {
return rootElement;
}
// If there are no editable root element, check its <body> element.
// Note that the body element could be <frameset> element.
nsCOMPtr<nsIDOMHTMLElement> body;
nsresult rv = domHTMLDoc->GetBody(getter_AddRefs(body));
nsCOMPtr<nsIContent> content = do_QueryInterface(body);
if (NS_SUCCEEDED(rv) && content && content->IsEditable()) {
return content;
}
return nullptr;
}
#ifdef DEBUG
/* static */ void
nsLayoutUtils::AssertNoDuplicateContinuations(nsIFrame* aContainer,
const nsFrameList& aFrameList)
{
for (nsIFrame* f = aFrameList.FirstChild(); f ; f = f->GetNextSibling()) {
// Check only later continuations of f; we deal with checking the
// earlier continuations when we hit those earlier continuations in
// the frame list.
for (nsIFrame *c = f; (c = c->GetNextInFlow());) {
NS_ASSERTION(c->GetParent() != aContainer ||
!aFrameList.ContainsFrame(c),
"Two continuations of the same frame in the same "
"frame list");
}
}
}
// Is one of aFrame's ancestors a letter frame?
static bool
IsInLetterFrame(nsIFrame *aFrame)
{
for (nsIFrame *f = aFrame->GetParent(); f; f = f->GetParent()) {
if (f->GetType() == nsGkAtoms::letterFrame) {
return true;
}
}
return false;
}
/* static */ void
nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(nsIFrame *aSubtreeRoot)
{
NS_ASSERTION(aSubtreeRoot->GetPrevInFlow(),
"frame tree not empty, but caller reported complete status");
// Also assert that text frames map no text.
int32_t start, end;
nsresult rv = aSubtreeRoot->GetOffsets(start, end);
NS_ASSERTION(NS_SUCCEEDED(rv), "GetOffsets failed");
// In some cases involving :first-letter, we'll partially unlink a
// continuation in the middle of a continuation chain from its
// previous and next continuations before destroying it, presumably so
// that we don't also destroy the later continuations. Once we've
// done this, GetOffsets returns incorrect values.
// For examples, see list of tests in
// https://bugzilla.mozilla.org/show_bug.cgi?id=619021#c29
NS_ASSERTION(start == end || IsInLetterFrame(aSubtreeRoot),
"frame tree not empty, but caller reported complete status");
nsIFrame::ChildListIterator lists(aSubtreeRoot);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(childFrames.get());
}
}
}
#endif
static void
GetFontFacesForFramesInner(nsIFrame* aFrame, nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
if (aFrame->GetType() == nsGkAtoms::textFrame) {
if (!aFrame->GetPrevContinuation()) {
nsLayoutUtils::GetFontFacesForText(aFrame, 0, INT32_MAX, true,
aFontFaceList);
}
return;
}
nsIFrame::ChildListID childLists[] = { nsIFrame::kPrincipalList,
nsIFrame::kPopupList };
for (size_t i = 0; i < ArrayLength(childLists); ++i) {
nsFrameList children(aFrame->GetChildList(childLists[i]));
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
child = nsPlaceholderFrame::GetRealFrameFor(child);
GetFontFacesForFramesInner(child, aFontFaceList);
}
}
}
/* static */
nsresult
nsLayoutUtils::GetFontFacesForFrames(nsIFrame* aFrame,
nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
while (aFrame) {
GetFontFacesForFramesInner(aFrame, aFontFaceList);
aFrame = GetNextContinuationOrIBSplitSibling(aFrame);
}
return NS_OK;
}
/* static */
nsresult
nsLayoutUtils::GetFontFacesForText(nsIFrame* aFrame,
int32_t aStartOffset, int32_t aEndOffset,
bool aFollowContinuations,
nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
if (aFrame->GetType() != nsGkAtoms::textFrame) {
return NS_OK;
}
nsTextFrame* curr = static_cast<nsTextFrame*>(aFrame);
do {
int32_t fstart = std::max(curr->GetContentOffset(), aStartOffset);
int32_t fend = std::min(curr->GetContentEnd(), aEndOffset);
if (fstart >= fend) {
curr = static_cast<nsTextFrame*>(curr->GetNextContinuation());
continue;
}
// curr is overlapping with the offset we want
gfxSkipCharsIterator iter = curr->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = curr->GetTextRun(nsTextFrame::eInflated);
NS_ENSURE_TRUE(textRun, NS_ERROR_OUT_OF_MEMORY);
// include continuations in the range that share the same textrun
nsTextFrame* next = nullptr;
if (aFollowContinuations && fend < aEndOffset) {
next = static_cast<nsTextFrame*>(curr->GetNextContinuation());
while (next && next->GetTextRun(nsTextFrame::eInflated) == textRun) {
fend = std::min(next->GetContentEnd(), aEndOffset);
next = fend < aEndOffset ?
static_cast<nsTextFrame*>(next->GetNextContinuation()) : nullptr;
}
}
uint32_t skipStart = iter.ConvertOriginalToSkipped(fstart);
uint32_t skipEnd = iter.ConvertOriginalToSkipped(fend);
aFontFaceList->AddFontsFromTextRun(textRun, skipStart, skipEnd - skipStart);
curr = next;
} while (aFollowContinuations && curr);
return NS_OK;
}
/* static */
size_t
nsLayoutUtils::SizeOfTextRunsForFrames(nsIFrame* aFrame,
MallocSizeOf aMallocSizeOf,
bool clear)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
size_t total = 0;
if (aFrame->GetType() == nsGkAtoms::textFrame) {
nsTextFrame* textFrame = static_cast<nsTextFrame*>(aFrame);
for (uint32_t i = 0; i < 2; ++i) {
gfxTextRun *run = textFrame->GetTextRun(
(i != 0) ? nsTextFrame::eInflated : nsTextFrame::eNotInflated);
if (run) {
if (clear) {
run->ResetSizeOfAccountingFlags();
} else {
total += run->MaybeSizeOfIncludingThis(aMallocSizeOf);
}
}
}
return total;
}
nsAutoTArray<nsIFrame::ChildList,4> childListArray;
aFrame->GetChildLists(&childListArray);
for (nsIFrame::ChildListArrayIterator childLists(childListArray);
!childLists.IsDone(); childLists.Next()) {
for (nsFrameList::Enumerator e(childLists.CurrentList());
!e.AtEnd(); e.Next()) {
total += SizeOfTextRunsForFrames(e.get(), aMallocSizeOf, clear);
}
}
return total;
}
/* static */
void
nsLayoutUtils::Initialize()
{
Preferences::AddUintVarCache(&sFontSizeInflationMaxRatio,
"font.size.inflation.maxRatio");
Preferences::AddUintVarCache(&sFontSizeInflationEmPerLine,
"font.size.inflation.emPerLine");
Preferences::AddUintVarCache(&sFontSizeInflationMinTwips,
"font.size.inflation.minTwips");
Preferences::AddUintVarCache(&sFontSizeInflationLineThreshold,
"font.size.inflation.lineThreshold");
Preferences::AddIntVarCache(&sFontSizeInflationMappingIntercept,
"font.size.inflation.mappingIntercept");
Preferences::AddBoolVarCache(&sFontSizeInflationForceEnabled,
"font.size.inflation.forceEnabled");
Preferences::AddBoolVarCache(&sFontSizeInflationDisabledInMasterProcess,
"font.size.inflation.disabledInMasterProcess");
Preferences::AddBoolVarCache(&sInvalidationDebuggingIsEnabled,
"nglayout.debug.invalidation");
Preferences::AddBoolVarCache(&sCSSVariablesEnabled,
"layout.css.variables.enabled");
Preferences::AddBoolVarCache(&sInterruptibleReflowEnabled,
"layout.interruptible-reflow.enabled");
Preferences::RegisterCallback(GridEnabledPrefChangeCallback,
GRID_ENABLED_PREF_NAME);
GridEnabledPrefChangeCallback(GRID_ENABLED_PREF_NAME, nullptr);
Preferences::RegisterCallback(StickyEnabledPrefChangeCallback,
STICKY_ENABLED_PREF_NAME);
StickyEnabledPrefChangeCallback(STICKY_ENABLED_PREF_NAME, nullptr);
Preferences::RegisterCallback(TextAlignTrueEnabledPrefChangeCallback,
TEXT_ALIGN_TRUE_ENABLED_PREF_NAME);
TextAlignTrueEnabledPrefChangeCallback(TEXT_ALIGN_TRUE_ENABLED_PREF_NAME,
nullptr);
nsComputedDOMStyle::RegisterPrefChangeCallbacks();
}
/* static */
void
nsLayoutUtils::Shutdown()
{
if (sContentMap) {
delete sContentMap;
sContentMap = nullptr;
}
Preferences::UnregisterCallback(GridEnabledPrefChangeCallback,
GRID_ENABLED_PREF_NAME);
Preferences::UnregisterCallback(StickyEnabledPrefChangeCallback,
STICKY_ENABLED_PREF_NAME);
nsComputedDOMStyle::UnregisterPrefChangeCallbacks();
}
/* static */
void
nsLayoutUtils::RegisterImageRequest(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
if (aRequestRegistered && *aRequestRegistered) {
// Our request is already registered with the refresh driver, so
// no need to register it again.
return;
}
if (aRequest) {
if (!aPresContext->RefreshDriver()->AddImageRequest(aRequest)) {
NS_WARNING("Unable to add image request");
return;
}
if (aRequestRegistered) {
*aRequestRegistered = true;
}
}
}
/* static */
void
nsLayoutUtils::RegisterImageRequestIfAnimated(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
if (aRequestRegistered && *aRequestRegistered) {
// Our request is already registered with the refresh driver, so
// no need to register it again.
return;
}
if (aRequest) {
nsCOMPtr<imgIContainer> image;
if (NS_SUCCEEDED(aRequest->GetImage(getter_AddRefs(image)))) {
// Check to verify that the image is animated. If so, then add it to the
// list of images tracked by the refresh driver.
bool isAnimated = false;
nsresult rv = image->GetAnimated(&isAnimated);
if (NS_SUCCEEDED(rv) && isAnimated) {
if (!aPresContext->RefreshDriver()->AddImageRequest(aRequest)) {
NS_WARNING("Unable to add image request");
return;
}
if (aRequestRegistered) {
*aRequestRegistered = true;
}
}
}
}
}
/* static */
void
nsLayoutUtils::DeregisterImageRequest(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
// Deregister our imgIRequest with the refresh driver to
// complete tear-down, but only if it has been registered
if (aRequestRegistered && !*aRequestRegistered) {
return;
}
if (aRequest) {
nsCOMPtr<imgIContainer> image;
if (NS_SUCCEEDED(aRequest->GetImage(getter_AddRefs(image)))) {
aPresContext->RefreshDriver()->RemoveImageRequest(aRequest);
if (aRequestRegistered) {
*aRequestRegistered = false;
}
}
}
}
/* static */
void
nsLayoutUtils::PostRestyleEvent(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint)
{
nsIDocument* doc = aElement->GetCurrentDoc();
if (doc) {
nsCOMPtr<nsIPresShell> presShell = doc->GetShell();
if (presShell) {
presShell->GetPresContext()->RestyleManager()->PostRestyleEvent(
aElement, aRestyleHint, aMinChangeHint);
}
}
}
nsSetAttrRunnable::nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
const nsAString& aValue)
: mContent(aContent),
mAttrName(aAttrName),
mValue(aValue)
{
NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
}
nsSetAttrRunnable::nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
int32_t aValue)
: mContent(aContent),
mAttrName(aAttrName)
{
NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
mValue.AppendInt(aValue);
}
NS_IMETHODIMP
nsSetAttrRunnable::Run()
{
return mContent->SetAttr(kNameSpaceID_None, mAttrName, mValue, true);
}
nsUnsetAttrRunnable::nsUnsetAttrRunnable(nsIContent* aContent,
nsIAtom* aAttrName)
: mContent(aContent),
mAttrName(aAttrName)
{
NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
}
NS_IMETHODIMP
nsUnsetAttrRunnable::Run()
{
return mContent->UnsetAttr(kNameSpaceID_None, mAttrName, true);
}
/**
* Compute the minimum font size inside of a container with the given
* width, such that **when the user zooms the container to fill the full
* width of the device**, the fonts satisfy our minima.
*/
static nscoord
MinimumFontSizeFor(nsPresContext* aPresContext, nscoord aContainerWidth)
{
nsIPresShell* presShell = aPresContext->PresShell();
uint32_t emPerLine = presShell->FontSizeInflationEmPerLine();
uint32_t minTwips = presShell->FontSizeInflationMinTwips();
if (emPerLine == 0 && minTwips == 0) {
return 0;
}
// Clamp the container width to the device dimensions
nscoord iFrameWidth = aPresContext->GetVisibleArea().width;
nscoord effectiveContainerWidth = std::min(iFrameWidth, aContainerWidth);
nscoord byLine = 0, byInch = 0;
if (emPerLine != 0) {
byLine = effectiveContainerWidth / emPerLine;
}
if (minTwips != 0) {
// REVIEW: Is this giving us app units and sizes *not* counting
// viewport scaling?
float deviceWidthInches =
aPresContext->ScreenWidthInchesForFontInflation();
byInch = NSToCoordRound(effectiveContainerWidth /
(deviceWidthInches * 1440 /
minTwips ));
}
return std::max(byLine, byInch);
}
/* static */ float
nsLayoutUtils::FontSizeInflationInner(const nsIFrame *aFrame,
nscoord aMinFontSize)
{
// Note that line heights should be inflated by the same ratio as the
// font size of the same text; thus we operate only on the font size
// even when we're scaling a line height.
nscoord styleFontSize = aFrame->StyleFont()->mFont.size;
if (styleFontSize <= 0) {
// Never scale zero font size.
return 1.0;
}
if (aMinFontSize <= 0) {
// No need to scale.
return 1.0;
}
// If between this current frame and its font inflation container there is a
// non-inline element with fixed width or height, then we should not inflate
// fonts for this frame.
for (const nsIFrame* f = aFrame;
f && !f->IsContainerForFontSizeInflation();
f = f->GetParent()) {
nsIContent* content = f->GetContent();
nsIAtom* fType = f->GetType();
// Also, if there is more than one frame corresponding to a single
// content node, we want the outermost one.
if (!(f->GetParent() && f->GetParent()->GetContent() == content) &&
// ignore width/height on inlines since they don't apply
fType != nsGkAtoms::inlineFrame &&
// ignore width on radios and checkboxes since we enlarge them and
// they have width/height in ua.css
fType != nsGkAtoms::formControlFrame) {
nsStyleCoord stylePosWidth = f->StylePosition()->mWidth;
nsStyleCoord stylePosHeight = f->StylePosition()->mHeight;
if (stylePosWidth.GetUnit() != eStyleUnit_Auto ||
stylePosHeight.GetUnit() != eStyleUnit_Auto) {
return 1.0;
}
}
}
int32_t interceptParam = nsLayoutUtils::FontSizeInflationMappingIntercept();
float maxRatio = (float)nsLayoutUtils::FontSizeInflationMaxRatio() / 100.0f;
float ratio = float(styleFontSize) / float(aMinFontSize);
float inflationRatio;
// Given a minimum inflated font size m, a specified font size s, we want to
// find the inflated font size i and then return the ratio of i to s (i/s).
if (interceptParam >= 0) {
// Since the mapping intercept parameter P is greater than zero, we use it
// to determine the point where our mapping function intersects the i=s
// line. This means that we have an equation of the form:
//
// i = m + s·(P/2)/(1 + P/2), if s <= (1 + P/2)·m
// i = s, if s >= (1 + P/2)·m
float intercept = 1 + float(interceptParam)/2.0f;
if (ratio >= intercept) {
// If we're already at 1+P/2 or more times the minimum, don't scale.
return 1.0;
}
// The point (intercept, intercept) is where the part of the i vs. s graph
// that's not slope 1 meets the i=s line. (This part of the
// graph is a line from (0, m), to that point). We calculate the
// intersection point to be ((1+P/2)m, (1+P/2)m), where P is the
// intercept parameter above. We then need to return i/s.
inflationRatio = (1.0f + (ratio * (intercept - 1) / intercept)) / ratio;
} else {
// This is the case where P is negative. We essentially want to implement
// the case for P=infinity here, so we make i = s + m, which means that
// i/s = s/s + m/s = 1 + 1/ratio
inflationRatio = 1 + 1.0f / ratio;
}
if (maxRatio > 1.0 && inflationRatio > maxRatio) {
return maxRatio;
} else {
return inflationRatio;
}
}
static bool
ShouldInflateFontsForContainer(const nsIFrame *aFrame)
{
// We only want to inflate fonts for text that is in a place
// with room to expand. The question is what the best heuristic for
// that is...
// For now, we're going to use NS_FRAME_IN_CONSTRAINED_HEIGHT, which
// indicates whether the frame is inside something with a constrained
// height (propagating down the tree), but the propagation stops when
// we hit overflow-y: scroll or auto.
const nsStyleText* styleText = aFrame->StyleText();
return styleText->mTextSizeAdjust != NS_STYLE_TEXT_SIZE_ADJUST_NONE &&
!(aFrame->GetStateBits() & NS_FRAME_IN_CONSTRAINED_HEIGHT) &&
// We also want to disable font inflation for containers that have
// preformatted text.
styleText->WhiteSpaceCanWrap(aFrame);
}
nscoord
nsLayoutUtils::InflationMinFontSizeFor(const nsIFrame *aFrame)
{
nsPresContext *presContext = aFrame->PresContext();
if (!FontSizeInflationEnabled(presContext) ||
presContext->mInflationDisabledForShrinkWrap) {
return 0;
}
for (const nsIFrame *f = aFrame; f; f = f->GetParent()) {
if (f->IsContainerForFontSizeInflation()) {
if (!ShouldInflateFontsForContainer(f)) {
return 0;
}
nsFontInflationData *data =
nsFontInflationData::FindFontInflationDataFor(aFrame);
// FIXME: The need to null-check here is sort of a bug, and might
// lead to incorrect results.
if (!data || !data->InflationEnabled()) {
return 0;
}
return MinimumFontSizeFor(aFrame->PresContext(),
data->EffectiveWidth());
}
}
NS_ABORT_IF_FALSE(false, "root should always be container");
return 0;
}
float
nsLayoutUtils::FontSizeInflationFor(const nsIFrame *aFrame)
{
if (aFrame->IsSVGText()) {
const nsIFrame* container = aFrame;
while (container->GetType() != nsGkAtoms::svgTextFrame) {
container = container->GetParent();
}
NS_ASSERTION(container, "expected to find an ancestor SVGTextFrame");
return
static_cast<const SVGTextFrame*>(container)->GetFontSizeScaleFactor();
}
if (!FontSizeInflationEnabled(aFrame->PresContext())) {
return 1.0f;
}
return FontSizeInflationInner(aFrame, InflationMinFontSizeFor(aFrame));
}
/* static */ bool
nsLayoutUtils::FontSizeInflationEnabled(nsPresContext *aPresContext)
{
nsIPresShell* presShell = aPresContext->GetPresShell();
if (!presShell) {
return false;
}
return presShell->FontSizeInflationEnabled();
}
/* static */ nsRect
nsLayoutUtils::GetBoxShadowRectForFrame(nsIFrame* aFrame,
const nsSize& aFrameSize)
{
nsCSSShadowArray* boxShadows = aFrame->StyleBorder()->mBoxShadow;
if (!boxShadows) {
return nsRect();
}
nsRect shadows;
int32_t A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
for (uint32_t i = 0; i < boxShadows->Length(); ++i) {
nsRect tmpRect(nsPoint(0, 0), aFrameSize);
nsCSSShadowItem* shadow = boxShadows->ShadowAt(i);
// inset shadows are never painted outside the frame
if (shadow->mInset)
continue;
tmpRect.MoveBy(nsPoint(shadow->mXOffset, shadow->mYOffset));
tmpRect.Inflate(shadow->mSpread);
tmpRect.Inflate(
nsContextBoxBlur::GetBlurRadiusMargin(shadow->mRadius, A2D));
shadows.UnionRect(shadows, tmpRect);
}
return shadows;
}
/* static */ void
nsLayoutUtils::UpdateImageVisibilityForFrame(nsIFrame* aImageFrame)
{
#ifdef DEBUG
nsIAtom* type = aImageFrame->GetType();
MOZ_ASSERT(type == nsGkAtoms::imageFrame ||
type == nsGkAtoms::imageControlFrame ||
type == nsGkAtoms::svgImageFrame, "wrong type of frame");
#endif
nsCOMPtr<nsIImageLoadingContent> content = do_QueryInterface(aImageFrame->GetContent());
if (!content) {
return;
}
nsIPresShell* presShell = aImageFrame->PresContext()->PresShell();
if (presShell->AssumeAllImagesVisible()) {
presShell->EnsureImageInVisibleList(content);
return;
}
bool visible = true;
nsIFrame* f = aImageFrame->GetParent();
nsRect rect = aImageFrame->GetContentRectRelativeToSelf();
nsIFrame* rectFrame = aImageFrame;
while (f) {
nsIScrollableFrame* sf = do_QueryFrame(f);
if (sf) {
nsRect transformedRect =
nsLayoutUtils::TransformFrameRectToAncestor(rectFrame, rect, f);
if (!sf->IsRectNearlyVisible(transformedRect)) {
visible = false;
break;
}
// Move transformedRect to be contained in the scrollport as best we can
// (it might not fit) to pretend that it was scrolled into view.
nsRect scrollPort = sf->GetScrollPortRect();
if (transformedRect.XMost() > scrollPort.XMost()) {
transformedRect.x -= transformedRect.XMost() - scrollPort.XMost();
}
if (transformedRect.x < scrollPort.x) {
transformedRect.x = scrollPort.x;
}
if (transformedRect.YMost() > scrollPort.YMost()) {
transformedRect.y -= transformedRect.YMost() - scrollPort.YMost();
}
if (transformedRect.y < scrollPort.y) {
transformedRect.y = scrollPort.y;
}
transformedRect.width = std::min(transformedRect.width, scrollPort.width);
transformedRect.height = std::min(transformedRect.height, scrollPort.height);
rect = transformedRect;
rectFrame = f;
}
nsIFrame* parent = f->GetParent();
if (!parent) {
parent = nsLayoutUtils::GetCrossDocParentFrame(f);
if (parent && parent->PresContext()->IsChrome()) {
break;
}
}
f = parent;
}
if (visible) {
presShell->EnsureImageInVisibleList(content);
} else {
presShell->RemoveImageFromVisibleList(content);
}
}
/* static */ nsSize
nsLayoutUtils::CalculateCompositionSizeForFrame(nsIFrame* aFrame)
{
nsSize size(aFrame->GetSize());
nsPresContext* presContext = aFrame->PresContext();
nsIPresShell* presShell = presContext->PresShell();
// See the comments in the code that calculates the root
// composition bounds in RecordFrameMetrics.
// TODO: Reuse that code here.
bool isRootContentDocRootScrollFrame = presContext->IsRootContentDocument()
&& aFrame == presShell->GetRootScrollFrame();
if (isRootContentDocRootScrollFrame) {
if (nsIFrame* rootFrame = presShell->GetRootFrame()) {
if (nsView* view = rootFrame->GetView()) {
nsSize viewSize = view->GetBounds().Size();
nsIWidget* widget =
#ifdef MOZ_WIDGET_ANDROID
rootFrame->GetNearestWidget();
#else
view->GetWidget();
#endif
if (widget) {
nsIntRect widgetBounds;
widget->GetBounds(widgetBounds);
int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel();
size = nsSize(widgetBounds.width * auPerDevPixel,
widgetBounds.height * auPerDevPixel);
#ifdef MOZ_WIDGET_ANDROID
if (viewSize.height < size.height) {
size.height = viewSize.height;
}
#endif
} else {
size = viewSize;
}
}
}
}
// Adjust composition bounds for the size of scroll bars.
nsIScrollableFrame* scrollableFrame = aFrame->GetScrollTargetFrame();
if (scrollableFrame && !LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars)) {
nsMargin margins = scrollableFrame->GetActualScrollbarSizes();
size.width -= margins.LeftRight();
size.height -= margins.TopBottom();
}
return size;
}
/* static */ nsRect
nsLayoutUtils::CalculateScrollableRectForFrame(nsIScrollableFrame* aScrollableFrame, nsIFrame* aRootFrame)
{
nsRect contentBounds;
if (aScrollableFrame) {
contentBounds = aScrollableFrame->GetScrollRange();
// We ifndef the below code for Fennec because it requires special behaviour
// on the APZC side. Because Fennec has it's own PZC implementation which doesn't
// provide the special behaviour, this code will cause it to break. We can remove
// the ifndef once Fennec switches over to APZ or if we add the special handling
// to Fennec
#ifndef MOZ_WIDGET_ANDROID
nsPoint scrollPosition = aScrollableFrame->GetScrollPosition();
if (aScrollableFrame->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
contentBounds.y = scrollPosition.y;
contentBounds.height = 0;
}
if (aScrollableFrame->GetScrollbarStyles().mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
contentBounds.x = scrollPosition.x;
contentBounds.width = 0;
}
#endif
contentBounds.width += aScrollableFrame->GetScrollPortRect().width;
contentBounds.height += aScrollableFrame->GetScrollPortRect().height;
} else {
contentBounds = aRootFrame->GetRect();
}
return contentBounds;
}
/* static */ nsRect
nsLayoutUtils::CalculateExpandedScrollableRect(nsIFrame* aFrame)
{
nsRect scrollableRect =
CalculateScrollableRectForFrame(aFrame->GetScrollTargetFrame(),
aFrame->PresContext()->PresShell()->GetRootFrame());
nsSize compSize = CalculateCompositionSizeForFrame(aFrame);
if (aFrame == aFrame->PresContext()->PresShell()->GetRootScrollFrame()) {
// the composition size for the root scroll frame does not include the
// local resolution, so we adjust.
gfxSize res = aFrame->PresContext()->PresShell()->GetResolution();
compSize.width = NSToCoordRound(compSize.width / ((float) res.width));
compSize.height = NSToCoordRound(compSize.height / ((float) res.height));
}
if (scrollableRect.width < compSize.width) {
scrollableRect.x = std::max(0,
scrollableRect.x - (compSize.width - scrollableRect.width));
scrollableRect.width = compSize.width;
}
if (scrollableRect.height < compSize.height) {
scrollableRect.y = std::max(0,
scrollableRect.y - (compSize.height - scrollableRect.height));
scrollableRect.height = compSize.height;
}
return scrollableRect;
}
nsLayoutUtils::SurfaceFromElementResult::SurfaceFromElementResult()
// Use safe default values here
: mIsWriteOnly(true), mIsStillLoading(false), mCORSUsed(false)
{
}
bool
nsLayoutUtils::IsNonWrapperBlock(nsIFrame* aFrame)
{
return GetAsBlock(aFrame) && !aFrame->IsBlockWrapper();
}
bool
nsLayoutUtils::NeedsPrintPreviewBackground(nsPresContext* aPresContext)
{
return aPresContext->IsRootPaginatedDocument() &&
(aPresContext->Type() == nsPresContext::eContext_PrintPreview ||
aPresContext->Type() == nsPresContext::eContext_PageLayout);
}
AutoMaybeDisableFontInflation::AutoMaybeDisableFontInflation(nsIFrame *aFrame)
{
// FIXME: Now that inflation calculations are based on the flow
// root's NCA's (nearest common ancestor of its inflatable
// descendants) width, we could probably disable inflation in
// fewer cases than we currently do.
if (aFrame->IsContainerForFontSizeInflation()) {
mPresContext = aFrame->PresContext();
mOldValue = mPresContext->mInflationDisabledForShrinkWrap;
mPresContext->mInflationDisabledForShrinkWrap = true;
} else {
// indicate we have nothing to restore
mPresContext = nullptr;
}
}
AutoMaybeDisableFontInflation::~AutoMaybeDisableFontInflation()
{
if (mPresContext) {
mPresContext->mInflationDisabledForShrinkWrap = mOldValue;
}
}
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