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gecko/layout/base/nsLayoutUtils.cpp

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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: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
* Mats Palmgren <mats.palmgren@bredband.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsLayoutUtils.h"
#include "nsIFormControlFrame.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsIDOMDocument.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsFrameList.h"
#include "nsGkAtoms.h"
#include "nsIAtom.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSAnonBoxes.h"
#include "nsIView.h"
#include "nsPlaceholderFrame.h"
#include "nsIScrollableFrame.h"
#include "nsCSSFrameConstructor.h"
#include "nsIPrivateDOMEvent.h"
#include "nsIDOMEvent.h"
#include "nsGUIEvent.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsFrameManager.h"
#include "nsBlockFrame.h"
#include "nsBidiPresUtils.h"
#include "imgIContainer.h"
#include "gfxRect.h"
#include "gfxContext.h"
#include "gfxFont.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsCSSRendering.h"
#include "nsContentUtils.h"
#include "nsThemeConstants.h"
#include "nsPIDOMWindow.h"
#include "nsIBaseWindow.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsIWidget.h"
#include "gfxMatrix.h"
#include "gfxTypes.h"
#include "gfxUserFontSet.h"
#include "nsTArray.h"
#include "nsHTMLCanvasElement.h"
#include "nsICanvasRenderingContextInternal.h"
#include "gfxPlatform.h"
#include "nsClientRect.h"
#ifdef MOZ_MEDIA
#include "nsHTMLVideoElement.h"
#endif
#include "imgIRequest.h"
#include "imgIContainer.h"
#include "nsIImageLoadingContent.h"
#include "nsCOMPtr.h"
#include "nsListControlFrame.h"
#include "ImageLayers.h"
#include "mozilla/arm.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 "nsSVGUtils.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGForeignObjectFrame.h"
#include "nsSVGOuterSVGFrame.h"
#ifdef MOZ_XUL
#include "nsXULPopupManager.h"
#endif
using namespace mozilla::layers;
using namespace mozilla::dom;
namespace css = mozilla::css;
#ifdef DEBUG
// TODO: remove, see bug 598468.
bool nsLayoutUtils::gPreventAssertInCompareTreePosition = false;
#endif // DEBUG
typedef gfxPattern::GraphicsFilter GraphicsFilter;
typedef FrameMetrics::ViewID ViewID;
static ViewID sScrollIdCounter = FrameMetrics::START_SCROLL_ID;
typedef nsDataHashtable<nsUint64HashKey, nsIContent*> ContentMap;
static ContentMap* sContentMap = NULL;
static ContentMap& GetContentMap() {
if (!sContentMap) {
sContentMap = new ContentMap();
#ifdef DEBUG
nsresult rv =
#endif
sContentMap->Init();
NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv), "Could not initialize map.");
}
return *sContentMap;
}
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.
*/
ViewID
nsLayoutUtils::FindIDFor(nsIContent* aContent)
{
ViewID scrollId;
void* scrollIdProperty = aContent->GetProperty(nsGkAtoms::RemoteId);
if (scrollIdProperty) {
scrollId = *static_cast<ViewID*>(scrollIdProperty);
} else {
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 &&
aId != FrameMetrics::ROOT_SCROLL_ID,
"Cannot find a content element in map for null or root IDs.");
nsIContent* content;
bool exists = GetContentMap().Get(aId, &content);
if (exists) {
return content;
} else {
return nsnull;
}
}
bool
nsLayoutUtils::GetDisplayPort(nsIContent* aContent, nsRect *aResult)
{
void* property = aContent->GetProperty(nsGkAtoms::DisplayPort);
if (!property) {
return false;
}
if (aResult) {
*aResult = *static_cast<nsRect*>(property);
}
return true;
}
nsIFrame*
nsLayoutUtils::GetLastContinuationWithChild(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
aFrame = aFrame->GetLastContinuation();
while (!aFrame->GetFirstChild(nsnull) &&
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->GetFirstChild(nsnull);
// 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::GetLastContinuationWithChild(aFrame);
nsIFrame* lastChildFrame = lastParentContinuation->GetLastChild(nsnull);
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->GetFirstContinuation();
// 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 nsnull;
}
//static
nsIAtom*
nsLayoutUtils::GetChildListNameFor(nsIFrame* aChildFrame)
{
nsIAtom* listName;
if (aChildFrame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
nsIFrame* pif = aChildFrame->GetPrevInFlow();
if (pif->GetParent() == aChildFrame->GetParent()) {
listName = nsGkAtoms::excessOverflowContainersList;
}
else {
listName = nsGkAtoms::overflowContainersList;
}
}
// 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->GetStyleDisplay();
if (NS_STYLE_POSITION_ABSOLUTE == disp->mPosition) {
listName = nsGkAtoms::absoluteList;
} else if (NS_STYLE_POSITION_FIXED == disp->mPosition) {
if (nsLayoutUtils::IsReallyFixedPos(aChildFrame)) {
listName = nsGkAtoms::fixedList;
} else {
listName = nsGkAtoms::absoluteList;
}
#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
// XXX FIXME: Bug 350740
// Return here, because the postcondition for this function actually
// fails for this case, since the popups are not in a "real" frame list
// in the popup set.
return nsGkAtoms::popupList;
#endif // MOZ_XUL
} else {
NS_ASSERTION(aChildFrame->GetStyleDisplay()->IsFloating(),
"not a floated frame");
listName = nsGkAtoms::floatList;
}
} else {
nsIAtom* childType = aChildFrame->GetType();
if (nsGkAtoms::menuPopupFrame == childType) {
nsIFrame* parent = aChildFrame->GetParent();
nsIFrame* firstPopup = (parent)
? parent->GetFirstChild(nsGkAtoms::popupList)
: nsnull;
NS_ASSERTION(!firstPopup || !firstPopup->GetNextSibling(),
"We assume popupList only has one child, but it has more.");
listName = firstPopup == aChildFrame ? nsGkAtoms::popupList : nsnull;
} else if (nsGkAtoms::tableColGroupFrame == childType) {
listName = nsGkAtoms::colGroupList;
} else if (nsGkAtoms::tableCaptionFrame == aChildFrame->GetType()) {
listName = nsGkAtoms::captionList;
} else {
listName = nsnull;
}
}
#ifdef NS_DEBUG
// Verify that the frame is actually in that child list or in the
// corresponding overflow list.
nsIFrame* parent = aChildFrame->GetParent();
PRBool found = parent->GetChildList(listName).ContainsFrame(aChildFrame);
if (!found) {
if (!(aChildFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
found = parent->GetChildList(nsGkAtoms::overflowList)
.ContainsFrame(aChildFrame);
}
else if (aChildFrame->GetStyleDisplay()->IsFloating()) {
found = parent->GetChildList(nsGkAtoms::overflowOutOfFlowList)
.ContainsFrame(aChildFrame);
}
// else it's positioned and should have been on the 'listName' child list.
NS_POSTCONDITION(found, "not in child list");
}
#endif
return listName;
}
// 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(nsnull, firstFrame,
nsCSSPseudoElements::before)) {
return firstFrame;
}
return nsnull;
}
// static
nsIFrame*
nsLayoutUtils::GetAfterFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
nsIFrame* lastFrame = GetLastChildFrame(aFrame, aFrame->GetContent());
if (lastFrame && IsGeneratedContentFor(nsnull, lastFrame,
nsCSSPseudoElements::after)) {
return lastFrame;
}
return nsnull;
}
// static
nsIFrame*
nsLayoutUtils::GetClosestFrameOfType(nsIFrame* aFrame, nsIAtom* aFrameType)
{
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
if (frame->GetType() == aFrameType) {
return frame;
}
}
return nsnull;
}
// static
nsIFrame*
nsLayoutUtils::GetStyleFrame(nsIFrame* aFrame)
{
if (aFrame->GetType() == nsGkAtoms::tableOuterFrame) {
nsIFrame* inner = aFrame->GetFirstChild(nsnull);
NS_ASSERTION(inner, "Outer table must have an inner");
return inner;
}
return aFrame;
}
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->GetStyleDisplay()->IsFloating(),
"How did that happen?");
return outOfFlowFrame;
}
return nsnull;
}
// static
PRBool
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 PR_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 PR_FALSE;
}
if (aContent && parent->GetContent() != aContent) {
return PR_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;
nsIView* v = aFrame->GetView();
if (!v)
return nsnull;
v = v->GetParent(); // anonymous inner view
if (!v)
return nsnull;
if (aExtraOffset) {
*aExtraOffset += v->GetPosition();
}
v = v->GetParent(); // subdocumentframe's view
if (!v)
return nsnull;
return static_cast<nsIFrame*>(v->GetClientData());
}
// static
PRBool
nsLayoutUtils::IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aCommonAncestor)
return PR_FALSE;
nsIFrame* parentFrame = GetCrossDocParentFrame(aFrame);
while (parentFrame != aCommonAncestor) {
if (parentFrame == aAncestorFrame)
return PR_TRUE;
parentFrame = GetCrossDocParentFrame(parentFrame);
}
return PR_FALSE;
}
// static
PRBool
nsLayoutUtils::IsAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aAncestorFrame)
return PR_TRUE;
return IsProperAncestorFrameCrossDoc(aAncestorFrame, aFrame, aCommonAncestor);
}
// static
PRBool
nsLayoutUtils::IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aCommonAncestor) {
return PR_FALSE;
}
nsIFrame* parentFrame = aFrame->GetParent();
while (parentFrame != aCommonAncestor) {
if (parentFrame == aAncestorFrame) {
return PR_TRUE;
}
parentFrame = parentFrame->GetParent();
}
return PR_FALSE;
}
// static
PRInt32
nsLayoutUtils::DoCompareTreePosition(nsIContent* aContent1,
nsIContent* aContent2,
PRInt32 aIf1Ancestor,
PRInt32 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->GetNodeParent()) {
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 = nsnull;
}
nsAutoTArray<nsINode*, 32> content2Ancestors;
nsINode* c2;
for (c2 = aContent2; c2 && c2 != aCommonAncestor; c2 = c2->GetNodeParent()) {
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, nsnull);
}
int last1 = content1Ancestors.Length() - 1;
int last2 = content2Ancestors.Length() - 1;
nsINode* content1Ancestor = nsnull;
nsINode* content2Ancestor = nsnull;
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->GetNodeParent();
#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;
}
PRInt32 index1 = parent->IndexOf(content1Ancestor);
PRInt32 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* FillAncestors(nsIFrame* aFrame,
nsIFrame* aStopAtAncestor, nsFrameManager* aFrameManager,
nsTArray<nsIFrame*>* aAncestors)
{
while (aFrame && aFrame != aStopAtAncestor) {
aAncestors->AppendElement(aFrame);
aFrame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrameManager, aFrame);
}
return aFrame;
}
// Return true if aFrame1 is after aFrame2
static PRBool IsFrameAfter(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
nsIFrame* f = aFrame2;
do {
f = f->GetNextSibling();
if (f == aFrame1)
return PR_TRUE;
} while (f);
return PR_FALSE;
}
// static
PRInt32
nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
PRInt32 aIf1Ancestor,
PRInt32 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;
}
nsFrameManager* frameManager = presContext->PresShell()->FrameManager();
nsAutoTArray<nsIFrame*,20> frame1Ancestors;
if (!FillAncestors(aFrame1, aCommonAncestor, frameManager, &frame1Ancestors)) {
// We reached the root of the frame tree ... if aCommonAncestor was set,
// it is wrong
aCommonAncestor = nsnull;
}
nsAutoTArray<nsIFrame*,20> frame2Ancestors;
if (!FillAncestors(aFrame2, aCommonAncestor, frameManager, &frame2Ancestors) &&
aCommonAncestor) {
// We reached the root of the frame tree ... aCommonAncestor was wrong.
// Try again with no hint.
return DoCompareTreePosition(aFrame1, aFrame2,
aIf1Ancestor, aIf2Ancestor, nsnull);
}
PRInt32 last1 = PRInt32(frame1Ancestors.Length()) - 1;
PRInt32 last2 = PRInt32(frame2Ancestors.Length()) - 1;
while (last1 >= 0 && last2 >= 0 &&
frame1Ancestors[last1] == frame2Ancestors[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 = frame2Ancestors[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 nsnull;
}
nsIFrame* next;
while ((next = aFrame->GetNextSibling()) != nsnull) {
aFrame = next;
}
return aFrame;
}
// static
nsIView*
nsLayoutUtils::FindSiblingViewFor(nsIView* aParentView, nsIFrame* aFrame) {
nsIFrame* parentViewFrame = static_cast<nsIFrame*>(aParentView->GetClientData());
nsIContent* parentViewContent = parentViewFrame ? parentViewFrame->GetContent() : nsnull;
for (nsIView* insertBefore = aParentView->GetFirstChild(); insertBefore;
insertBefore = insertBefore->GetNextSibling()) {
nsIFrame* f = static_cast<nsIFrame*>(insertBefore->GetClientData());
if (!f) {
// this view could be some anonymous view attached to a meaningful parent
for (nsIView* searchView = insertBefore->GetParent(); searchView;
searchView = searchView->GetParent()) {
f = static_cast<nsIFrame*>(searchView->GetClientData());
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 nsnull;
}
//static
nsIScrollableFrame*
nsLayoutUtils::GetScrollableFrameFor(nsIFrame *aScrolledFrame)
{
nsIFrame *frame = aScrolledFrame->GetParent();
if (!frame) {
return nsnull;
}
nsIScrollableFrame *sf = do_QueryFrame(frame);
return sf;
}
nsIFrame*
nsLayoutUtils::GetActiveScrolledRootFor(nsIFrame* aFrame,
nsIFrame* aStopAtAncestor)
{
nsIFrame* f = aFrame;
while (f != aStopAtAncestor) {
if (IsPopup(f))
break;
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent)
break;
nsIScrollableFrame* sf = do_QueryFrame(parent);
if (sf && sf->IsScrollingActive() && sf->GetScrolledFrame() == f)
break;
f = parent;
}
return f;
}
nsIFrame*
nsLayoutUtils::GetActiveScrolledRootFor(nsDisplayItem* aItem,
nsDisplayListBuilder* aBuilder,
PRBool* aShouldFixToViewport)
{
nsIFrame* f = aItem->GetUnderlyingFrame();
if (aShouldFixToViewport) {
*aShouldFixToViewport = PR_FALSE;
}
if (!f) {
return nsnull;
}
if (aItem->ShouldFixToViewport(aBuilder)) {
if (aShouldFixToViewport) {
*aShouldFixToViewport = PR_TRUE;
}
// 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::GetActiveScrolledRootFor(viewportFrame, aBuilder->ReferenceFrame());
} else {
return nsLayoutUtils::GetActiveScrolledRootFor(f, aBuilder->ReferenceFrame());
}
}
PRBool
nsLayoutUtils::ScrolledByViewportScrolling(nsIFrame* aActiveScrolledRoot,
nsDisplayListBuilder* aBuilder)
{
nsIFrame* rootScrollFrame =
aBuilder->ReferenceFrame()->PresContext()->GetPresShell()->GetRootScrollFrame();
return nsLayoutUtils::IsAncestorFrameCrossDoc(rootScrollFrame, aActiveScrolledRoot);
}
// 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) {
nsPresContext::ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
PRUint32 scrollbarVisibility = scrollableFrame->GetScrollbarVisibility();
nsRect scrollRange = scrollableFrame->GetScrollRange();
// Require visible scrollbars or something to scroll to in
// the given direction.
if (aDirection == eVertical ?
(ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN &&
((scrollbarVisibility & nsIScrollableFrame::VERTICAL) ||
scrollRange.height > 0)) :
(ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
((scrollbarVisibility & nsIScrollableFrame::HORIZONTAL) ||
scrollRange.width > 0)))
return scrollableFrame;
}
}
return nsnull;
}
// static
nsIScrollableFrame*
nsLayoutUtils::GetNearestScrollableFrame(nsIFrame* aFrame)
{
NS_ASSERTION(aFrame, "GetNearestScrollableFrame expects a non-null frame");
for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
if (scrollableFrame) {
nsPresContext::ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
if (ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN ||
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN)
return scrollableFrame;
}
}
return nsnull;
}
//static
PRBool
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 != nsnull;
}
nsPoint
nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent, nsIFrame* aFrame)
{
nsCOMPtr<nsIPrivateDOMEvent> privateEvent(do_QueryInterface(aDOMEvent));
NS_ASSERTION(privateEvent, "bad implementation");
if (!privateEvent)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsEvent *event = privateEvent->GetInternalNSEvent();
if (!event)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
return GetEventCoordinatesRelativeTo(event, aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(const nsEvent* aEvent, nsIFrame* aFrame)
{
if (!aEvent || (aEvent->eventStructType != NS_MOUSE_EVENT &&
aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT &&
aEvent->eventStructType != NS_DRAG_EVENT &&
aEvent->eventStructType != NS_SIMPLE_GESTURE_EVENT &&
aEvent->eventStructType != NS_GESTURENOTIFY_EVENT &&
aEvent->eventStructType != NS_MOZTOUCH_EVENT &&
aEvent->eventStructType != NS_QUERY_CONTENT_EVENT))
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
const nsGUIEvent* GUIEvent = static_cast<const nsGUIEvent*>(aEvent);
if (!GUIEvent->widget)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
/* 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;
PRBool transformFound = PR_FALSE;
for (nsIFrame* f = aFrame; f; f = GetCrossDocParentFrame(f)) {
if (f->IsTransformed())
transformFound = PR_TRUE;
rootFrame = f;
}
nsIView* rootView = rootFrame->GetView();
if (!rootView)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsPoint widgetToView = TranslateWidgetToView(rootFrame->PresContext(),
GUIEvent->widget, GUIEvent->refPoint,
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.
PRInt32 rootAPD = rootFrame->PresContext()->AppUnitsPerDevPixel();
PRInt32 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)
return InvertTransformsToRoot(aFrame, widgetToView);
/* Otherwise, all coordinate systems are translations of one another,
* so we can just subtract out the different.
*/
return widgetToView - aFrame->GetOffsetToCrossDoc(rootFrame);
}
nsIFrame*
nsLayoutUtils::GetPopupFrameForEventCoordinates(nsPresContext* aPresContext,
const nsEvent* aEvent)
{
#ifdef MOZ_XUL
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (!pm) {
return nsnull;
}
nsTArray<nsIFrame*> popups = pm->GetVisiblePopups();
PRUint32 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 nsnull;
}
gfxMatrix
nsLayoutUtils::ChangeMatrixBasis(const gfxPoint &aOrigin,
const gfxMatrix &aMatrix)
{
/* These are translation matrices from world-to-origin of relative frame and
* vice-versa. Although I could use the gfxMatrix::Translate function to
* accomplish this, I'm hoping to reduce the overall number of matrix
* operations by hardcoding as many of the matrices as possible.
*/
gfxMatrix worldToOrigin(1.0, 0.0, 0.0, 1.0, -aOrigin.x, -aOrigin.y);
gfxMatrix originToWorld(1.0, 0.0, 0.0, 1.0, aOrigin.x, aOrigin.y);
/* Multiply all three to get the transform! */
gfxMatrix result(worldToOrigin);
result.Multiply(aMatrix);
result.Multiply(originToWorld);
return result;
}
/**
* 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;
}
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);
ConstrainToCoordValues(scaledRect.y);
ConstrainToCoordValues(scaledRect.width);
ConstrainToCoordValues(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 = NS_MAX(aRadii[NS_CORNER_TOP_LEFT_X], aRadii[NS_CORNER_BOTTOM_LEFT_X]);
rectFullHeight.x += xDiff;
rectFullHeight.width -= NS_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 = NS_MAX(aRadii[NS_CORNER_TOP_LEFT_Y], aRadii[NS_CORNER_TOP_RIGHT_Y]);
rectFullWidth.y += yDiff;
rectFullWidth.height -= NS_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;
}
nsRect
nsLayoutUtils::MatrixTransformRectOut(const nsRect &aBounds,
const gfxMatrix &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 gfxMatrix &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 gfxMatrix &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));
}
gfxMatrix nsLayoutUtils::GetTransformToAncestor(nsIFrame *aFrame,
nsIFrame* aStopAtAncestor)
{
gfxMatrix ctm;
/* Starting at the specified frame, we'll use the GetTransformMatrix
* function of the frame, which gives us a matrix from this frame up
* to some other ancestor frame. If aStopAtAncestor frame is not reached,
* we stop at root. We get the CTM by simply accumulating all of these
* matrices together.
*/
while (aFrame && aFrame != aStopAtAncestor) {
ctm *= aFrame->GetTransformMatrix(&aFrame);
}
NS_ASSERTION(aFrame == aStopAtAncestor, "How did we manage to miss the ancestor?");
return ctm;
}
nsPoint
nsLayoutUtils::InvertTransformsToRoot(nsIFrame *aFrame,
const nsPoint &aPoint)
{
NS_PRECONDITION(aFrame, "Why are you inverting transforms when there is no frame?");
/* To invert everything to the root, we'll get the CTM, invert it, and use it to transform
* the point.
*/
gfxMatrix ctm = GetTransformToAncestor(aFrame);
/* If the ctm is singular, hand back (0, 0) as a sentinel. */
if (ctm.IsSingular())
return nsPoint(0, 0);
/* Otherwise, invert the CTM and use it to transform the point. */
return MatrixTransformPoint(aPoint, ctm.Invert(), aFrame->PresContext()->AppUnitsPerDevPixel());
}
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,
nsIView* 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, LEFT_AND_RIGHT.
PRUint8
nsLayoutUtils::CombineBreakType(PRUint8 aOrigBreakType,
PRUint8 aNewBreakType)
{
PRUint8 breakType = aOrigBreakType;
switch(breakType) {
case NS_STYLE_CLEAR_LEFT:
if ((NS_STYLE_CLEAR_RIGHT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = NS_STYLE_CLEAR_LEFT_AND_RIGHT;
}
break;
case NS_STYLE_CLEAR_RIGHT:
if ((NS_STYLE_CLEAR_LEFT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = NS_STYLE_CLEAR_LEFT_AND_RIGHT;
}
break;
case NS_STYLE_CLEAR_NONE:
if ((NS_STYLE_CLEAR_LEFT == aNewBreakType) ||
(NS_STYLE_CLEAR_RIGHT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = aNewBreakType;
}
}
return breakType;
}
#ifdef DEBUG
#include <stdio.h>
static PRBool gDumpPaintList = getenv("MOZ_DUMP_PAINT_LIST") != 0;
static PRBool gDumpEventList = PR_FALSE;
#endif
nsresult
nsLayoutUtils::GetRemoteContentIds(nsIFrame* aFrame,
const nsRect& aTarget,
nsTArray<ViewID> &aOutIDs,
PRBool aIgnoreRootScrollFrame)
{
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::EVENT_DELIVERY,
PR_FALSE);
nsDisplayList list;
if (aIgnoreRootScrollFrame) {
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (rootScrollFrame) {
builder.SetIgnoreScrollFrame(rootScrollFrame);
}
}
builder.EnterPresShell(aFrame, aTarget);
nsresult rv =
aFrame->BuildDisplayListForStackingContext(&builder, aTarget, &list);
builder.LeavePresShell(aFrame, aTarget);
NS_ENSURE_SUCCESS(rv, rv);
nsTArray<nsIFrame*> outFrames;
nsDisplayItem::HitTestState hitTestState(&aOutIDs);
list.HitTest(&builder, aTarget, &hitTestState, &outFrames);
list.DeleteAll();
return NS_OK;
}
nsIFrame*
nsLayoutUtils::GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt,
PRBool aShouldIgnoreSuppression,
PRBool aIgnoreRootScrollFrame)
{
nsresult rv;
nsTArray<nsIFrame*> outFrames;
rv = GetFramesForArea(aFrame, nsRect(aPt, nsSize(1, 1)), outFrames,
aShouldIgnoreSuppression, aIgnoreRootScrollFrame);
NS_ENSURE_SUCCESS(rv, nsnull);
return outFrames.Length() ? outFrames.ElementAt(0) : nsnull;
}
nsresult
nsLayoutUtils::GetFramesForArea(nsIFrame* aFrame, const nsRect& aRect,
nsTArray<nsIFrame*> &aOutFrames,
PRBool aShouldIgnoreSuppression,
PRBool aIgnoreRootScrollFrame)
{
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::EVENT_DELIVERY,
PR_FALSE);
nsDisplayList list;
nsRect target(aRect);
if (aShouldIgnoreSuppression) {
builder.IgnorePaintSuppression();
}
if (aIgnoreRootScrollFrame) {
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (rootScrollFrame) {
builder.SetIgnoreScrollFrame(rootScrollFrame);
}
}
builder.EnterPresShell(aFrame, target);
nsresult rv =
aFrame->BuildDisplayListForStackingContext(&builder, target, &list);
builder.LeavePresShell(aFrame, target);
NS_ENSURE_SUCCESS(rv, rv);
#ifdef DEBUG
if (gDumpEventList) {
fprintf(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;
}
/**
* Remove all leaf display items that are not for descendants of
* aBuilder->GetReferenceFrame() from aList, and move all nsDisplayClip
* wrappers to their correct locations.
* @param aExtraPage the page we constructed aList for
* @param aY the Y-coordinate where aPage would be positioned relative
* to the main page (aBuilder->GetReferenceFrame()), considering only
* the content and ignoring page margins and dead space
* @param aList the list that is modified in-place
*/
static void
PruneDisplayListForExtraPage(nsDisplayListBuilder* aBuilder,
nsIFrame* aExtraPage, nscoord aY, nsDisplayList* aList)
{
nsDisplayList newList;
// The page which we're really constructing a display list for
nsIFrame* mainPage = aBuilder->ReferenceFrame();
while (PR_TRUE) {
nsDisplayItem* i = aList->RemoveBottom();
if (!i)
break;
nsDisplayList* subList = i->GetList();
if (subList) {
PruneDisplayListForExtraPage(aBuilder, aExtraPage, aY, subList);
nsDisplayItem::Type type = i->GetType();
if (type == nsDisplayItem::TYPE_CLIP ||
type == nsDisplayItem::TYPE_CLIP_ROUNDED_RECT) {
// This might clip an element which should appear on the first
// page, and that element might be visible if this uses a 'clip'
// property with a negative top.
// The clip area needs to be moved because the frame geometry doesn't
// put page content frames for adjacent pages vertically adjacent,
// there are page margins and dead space between them in print
// preview, and in printing all pages are at (0,0)...
// XXX we have no way to test this right now that I know of;
// the 'clip' property requires an abs-pos element and we never
// paint abs-pos elements that start after the main page
// (bug 426909).
nsDisplayClip* clip = static_cast<nsDisplayClip*>(i);
clip->SetClipRect(clip->GetClipRect() + nsPoint(0, aY) -
aExtraPage->GetOffsetTo(mainPage));
}
newList.AppendToTop(i);
} else {
nsIFrame* f = i->GetUnderlyingFrame();
if (f && nsLayoutUtils::IsProperAncestorFrameCrossDoc(mainPage, f)) {
// This one is in the page we care about, keep it
newList.AppendToTop(i);
} else {
// We're throwing this away so call its destructor now. The memory
// is owned by aBuilder which destroys all items at once.
i->~nsDisplayItem();
}
}
}
aList->AppendToTop(&newList);
}
static nsresult
BuildDisplayListForExtraPage(nsDisplayListBuilder* aBuilder,
nsIFrame* aPage, nscoord aY, nsDisplayList* aList)
{
nsDisplayList list;
// Pass an empty dirty rect since we're only interested in finding
// placeholders whose out-of-flows are in the page
// aBuilder->GetReferenceFrame(), and the paths to those placeholders
// have already been marked as NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO.
// Note that we should still do a prune step since we don't want to
// rely on dirty-rect checking for correctness.
nsresult rv = aPage->BuildDisplayListForStackingContext(aBuilder, nsRect(), &list);
if (NS_FAILED(rv))
return rv;
PruneDisplayListForExtraPage(aBuilder, aPage, aY, &list);
aList->AppendToTop(&list);
return NS_OK;
}
static nsIFrame*
GetNextPage(nsIFrame* aPageContentFrame)
{
// XXX ugh
nsIFrame* pageFrame = aPageContentFrame->GetParent();
NS_ASSERTION(pageFrame->GetType() == nsGkAtoms::pageFrame,
"pageContentFrame has unexpected parent");
nsIFrame* nextPageFrame = pageFrame->GetNextSibling();
if (!nextPageFrame)
return nsnull;
NS_ASSERTION(nextPageFrame->GetType() == nsGkAtoms::pageFrame,
"pageFrame's sibling is not a page frame...");
nsIFrame* f = nextPageFrame->GetFirstChild(nsnull);
NS_ASSERTION(f, "pageFrame has no page content frame!");
NS_ASSERTION(f->GetType() == nsGkAtoms::pageContentFrame,
"pageFrame's child is not page content!");
return f;
}
nsresult
nsLayoutUtils::PaintFrame(nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const nsRegion& aDirtyRegion, nscolor aBackstop,
PRUint32 aFlags)
{
if (aFlags & PAINT_WIDGET_LAYERS) {
nsIView* 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();
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
bool usingDisplayPort = false;
nsRect displayport;
if (rootScrollFrame) {
nsIContent* content = rootScrollFrame->GetContent();
if (content) {
usingDisplayPort = nsLayoutUtils::GetDisplayPort(content, &displayport);
}
}
PRBool ignoreViewportScrolling = presShell->IgnoringViewportScrolling();
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.
PRBool willFlushRetainedLayers = (aFlags & PAINT_HIDE_CARET) != 0;
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::PAINTING,
!(aFlags & PAINT_HIDE_CARET));
if (usingDisplayPort) {
builder.SetDisplayPort(displayport);
}
nsDisplayList list;
if (aFlags & PAINT_IN_TRANSFORM) {
builder.SetInTransform(PR_TRUE);
}
if (aFlags & PAINT_SYNC_DECODE_IMAGES) {
builder.SetSyncDecodeImages(PR_TRUE);
}
if (aFlags & (PAINT_WIDGET_LAYERS | PAINT_TO_WINDOW)) {
builder.SetPaintingToWindow(PR_TRUE);
}
if (aFlags & PAINT_IGNORE_SUPPRESSION) {
builder.IgnorePaintSuppression();
}
if (aRenderingContext &&
aRenderingContext->ThebesContext()->GetFlags() & gfxContext::FLAG_DISABLE_SNAPPING) {
builder.SetSnappingEnabled(PR_FALSE);
}
nsRect canvasArea(nsPoint(0, 0), aFrame->GetSize());
#ifdef DEBUG
if (ignoreViewportScrolling) {
nsIDocument* doc = aFrame->GetContent() ?
aFrame->GetContent()->GetCurrentDoc() : nsnull;
NS_ASSERTION(!aFrame->GetParent() ||
(doc && doc->IsBeingUsedAsImage()),
"Only expecting ignoreViewportScrolling for root frames and "
"for image documents.");
}
#endif
if (ignoreViewportScrolling && !aFrame->GetParent()) {
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
if (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));
}
}
}
nsresult rv;
nsRect dirtyRect = visibleRegion.GetBounds();
builder.EnterPresShell(aFrame, dirtyRect);
rv = aFrame->BuildDisplayListForStackingContext(&builder, dirtyRect, &list);
const PRBool 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 (NS_SUCCEEDED(rv) && !paintAllContinuations &&
frameType == nsGkAtoms::pageContentFrame) {
NS_ASSERTION(!(aFlags & PAINT_WIDGET_LAYERS),
"shouldn't be painting with widget layers for page content frames");
// We may need to paint out-of-flow frames whose placeholders are
// on other pages. Add those pages to our display list. Note that
// out-of-flow frames can't be placed after their placeholders so
// we don't have to process earlier pages. The display lists for
// these extra pages are pruned so that only display items for the
// page we currently care about (which we would have reached by
// following placeholders to their out-of-flows) end up on the list.
nsIFrame* page = aFrame;
nscoord y = aFrame->GetSize().height;
while ((page = GetNextPage(page)) != nsnull) {
rv = BuildDisplayListForExtraPage(&builder, page, y, &list);
if (NS_FAILED(rv))
break;
y += page->GetSize().height;
}
}
if (paintAllContinuations) {
nsIFrame* currentFrame = aFrame;
while (NS_SUCCEEDED(rv) &&
(currentFrame = currentFrame->GetNextContinuation()) != nsnull) {
nsRect frameDirty = dirtyRect - builder.ToReferenceFrame(currentFrame);
rv = 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());
rv = 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.
rv = 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) {
nsIView* 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 = PR_TRUE;
}
}
}
}
builder.LeavePresShell(aFrame, dirtyRect);
NS_ENSURE_SUCCESS(rv, rv);
if (builder.GetHadToIgnorePaintSuppression()) {
willFlushRetainedLayers = PR_TRUE;
}
#ifdef DEBUG
if (gDumpPaintList) {
fprintf(stderr, "Painting --- before optimization (dirty %d,%d,%d,%d):\n",
dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height);
nsFrame::PrintDisplayList(&builder, list);
}
#endif
list.ComputeVisibilityForRoot(&builder, &visibleRegion);
PRUint32 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;
}
list.PaintRoot(&builder, aRenderingContext, flags);
// Update the widget's opaque region information. This sets
// glass boundaries on Windows.
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);
}
}
#ifdef DEBUG
if (gDumpPaintList) {
fprintf(stderr, "Painting --- after optimization:\n");
nsFrame::PrintDisplayList(&builder, list);
fprintf(stderr, "Painting --- retained layer tree:\n");
builder.LayerBuilder()->DumpRetainedLayerTree();
}
#endif
// Flush the list so we don't trigger the IsEmpty-on-destruction assertion
list.DeleteAll();
return NS_OK;
}
PRInt32
nsLayoutUtils::GetZIndex(nsIFrame* aFrame) {
if (!aFrame->GetStyleDisplay()->IsPositioned())
return 0;
const nsStylePosition* position =
aFrame->GetStylePosition();
if (position->mZIndex.GetUnit() == eStyleUnit_Integer)
return position->mZIndex.GetIntValue();
// sort the auto and 0 elements together
return 0;
}
/**
* 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
*/
PRBool
nsLayoutUtils::BinarySearchForPosition(nsRenderingContext* aRendContext,
const PRUnichar* aText,
PRInt32 aBaseWidth,
PRInt32 aBaseInx,
PRInt32 aStartInx,
PRInt32 aEndInx,
PRInt32 aCursorPos,
PRInt32& aIndex,
PRInt32& aTextWidth)
{
PRInt32 range = aEndInx - aStartInx;
if ((range == 1) || (range == 2 && NS_IS_HIGH_SURROGATE(aText[aStartInx]))) {
aIndex = aStartInx + aBaseInx;
aTextWidth = aRendContext->GetWidth(aText, aIndex);
return PR_TRUE;
}
PRInt32 inx = aStartInx + (range / 2);
// Make sure we don't leave a dangling low surrogate
if (NS_IS_HIGH_SURROGATE(aText[inx-1]))
inx++;
PRInt32 textWidth = aRendContext->GetWidth(aText, inx);
PRInt32 fullWidth = aBaseWidth + textWidth;
if (fullWidth == aCursorPos) {
aTextWidth = textWidth;
aIndex = inx;
return PR_TRUE;
} else if (aCursorPos < fullWidth) {
aTextWidth = aBaseWidth;
if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, aStartInx, inx, aCursorPos, aIndex, aTextWidth)) {
return PR_TRUE;
}
} else {
aTextWidth = fullWidth;
if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, inx, aEndInx, aCursorPos, aIndex, aTextWidth)) {
return PR_TRUE;
}
}
return PR_FALSE;
}
static void
AddBoxesForFrame(nsIFrame* aFrame,
nsLayoutUtils::BoxCallback* aCallback)
{
nsIAtom* pseudoType = aFrame->GetStyleContext()->GetPseudo();
if (pseudoType == nsCSSAnonBoxes::tableOuter) {
AddBoxesForFrame(aFrame->GetFirstChild(nsnull), aCallback);
nsIFrame* kid = aFrame->GetFirstChild(nsGkAtoms::captionList);
if (kid) {
AddBoxesForFrame(kid, aCallback);
}
} else if (pseudoType == nsCSSAnonBoxes::mozAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozAnonymousPositionedBlock ||
pseudoType == nsCSSAnonBoxes::mozMathMLAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
for (nsIFrame* kid = aFrame->GetFirstChild(nsnull); 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::GetNextContinuationOrSpecialSibling(aFrame);
}
}
struct BoxToBorderRect : public nsLayoutUtils::BoxCallback {
nsIFrame* mRelativeTo;
nsLayoutUtils::RectCallback* mCallback;
BoxToBorderRect(nsIFrame* aRelativeTo, nsLayoutUtils::RectCallback* aCallback)
: mRelativeTo(aRelativeTo), mCallback(aCallback) {}
virtual void AddBox(nsIFrame* aFrame) {
nsRect r;
nsIFrame* outer = nsSVGUtils::GetOuterSVGFrameAndCoveredRegion(aFrame, &r);
if (outer) {
mCallback->AddRect(r + outer->GetOffsetTo(mRelativeTo));
} else
mCallback->AddRect(nsRect(aFrame->GetOffsetTo(mRelativeTo), aFrame->GetSize()));
}
};
void
nsLayoutUtils::GetAllInFlowRects(nsIFrame* aFrame, nsIFrame* aRelativeTo,
RectCallback* aCallback)
{
BoxToBorderRect converter(aRelativeTo, aCallback);
GetAllInFlowBoxes(aFrame, &converter);
}
nsLayoutUtils::RectAccumulator::RectAccumulator() : mSeenFirstRect(PR_FALSE) {}
void nsLayoutUtils::RectAccumulator::AddRect(const nsRect& aRect) {
mResultRect.UnionRect(mResultRect, aRect);
if (!mSeenFirstRect) {
mSeenFirstRect = PR_TRUE;
mFirstRect = aRect;
}
}
nsLayoutUtils::RectListBuilder::RectListBuilder(nsClientRectList* aList)
: mRectList(aList), mRV(NS_OK) {}
void nsLayoutUtils::RectListBuilder::AddRect(const nsRect& aRect) {
nsRefPtr<nsClientRect> rect = new nsClientRect();
if (!rect) {
mRV = NS_ERROR_OUT_OF_MEMORY;
return;
}
rect->SetLayoutRect(aRect);
mRectList->Append(rect);
}
nsIFrame* nsLayoutUtils::GetContainingBlockForClientRect(nsIFrame* aFrame)
{
// get the nearest enclosing SVG foreign object frame or the root frame
while (aFrame->GetParent() &&
!aFrame->IsFrameOfType(nsIFrame::eSVGForeignObject)) {
aFrame = aFrame->GetParent();
}
return aFrame;
}
nsRect
nsLayoutUtils::GetAllInFlowRectsUnion(nsIFrame* aFrame, nsIFrame* aRelativeTo) {
RectAccumulator accumulator;
GetAllInFlowRects(aFrame, aRelativeTo, &accumulator);
return accumulator.mResultRect.IsEmpty() ? accumulator.mFirstRect
: accumulator.mResultRect;
}
nsRect
nsLayoutUtils::GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
nsIFrame* aFrame,
PRUint32 aFlags)
{
const nsStyleText* textStyle = aFrame->GetStyleText();
if (!textStyle->mTextShadow)
return aTextAndDecorationsRect;
nsRect resultRect = aTextAndDecorationsRect;
PRInt32 A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
for (PRUint32 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)
{
return nsLayoutUtils::GetFontMetricsForStyleContext(aFrame->GetStyleContext(),
aFontMetrics);
}
nsresult
nsLayoutUtils::GetFontMetricsForStyleContext(nsStyleContext* aStyleContext,
nsFontMetrics** aFontMetrics)
{
// pass the user font set object into the device context to pass along to CreateFontGroup
gfxUserFontSet* fs = aStyleContext->PresContext()->GetUserFontSet();
return aStyleContext->PresContext()->DeviceContext()->GetMetricsFor(
aStyleContext->GetStyleFont()->mFont,
aStyleContext->GetStyleVisibility()->mLanguage,
fs, *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 nsnull;
}
nsIFrame*
nsLayoutUtils::GetNonGeneratedAncestor(nsIFrame* aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT))
return aFrame;
nsFrameManager* frameManager = aFrame->PresContext()->FrameManager();
nsIFrame* f = aFrame;
do {
f = GetParentOrPlaceholderFor(frameManager, f);
} while (f->GetStateBits() & NS_FRAME_GENERATED_CONTENT);
return f;
}
nsIFrame*
nsLayoutUtils::GetParentOrPlaceholderFor(nsFrameManager* aFrameManager,
nsIFrame* aFrame)
{
if ((aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
&& !aFrame->GetPrevInFlow()) {
return aFrameManager->GetPlaceholderFrameFor(aFrame);
}
return aFrame->GetParent();
}
nsIFrame*
nsLayoutUtils::GetNextContinuationOrSpecialSibling(nsIFrame *aFrame)
{
nsIFrame *result = aFrame->GetNextContinuation();
if (result)
return result;
if ((aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL) != 0) {
// We only store the "special sibling" annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
aFrame = aFrame->GetFirstContinuation();
void* value = aFrame->Properties().Get(nsIFrame::IBSplitSpecialSibling());
return static_cast<nsIFrame*>(value);
}
return nsnull;
}
nsIFrame*
nsLayoutUtils::GetFirstContinuationOrSpecialSibling(nsIFrame *aFrame)
{
nsIFrame *result = aFrame->GetFirstContinuation();
if (result->GetStateBits() & NS_FRAME_IS_SPECIAL) {
while (PR_TRUE) {
nsIFrame *f = static_cast<nsIFrame*>
(result->Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
if (!f)
break;
result = f;
}
}
return result;
}
PRBool
nsLayoutUtils::IsViewportScrollbarFrame(nsIFrame* aFrame)
{
if (!aFrame)
return PR_FALSE;
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (!rootScrollFrame)
return PR_FALSE;
nsIScrollableFrame* rootScrollableFrame = do_QueryFrame(rootScrollFrame);
NS_ASSERTION(rootScrollableFrame, "The root scorollable frame is null");
if (!IsProperAncestorFrame(rootScrollFrame, aFrame))
return PR_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 PRBool GetAbsoluteCoord(const nsStyleCoord& aStyle, nscoord& aResult)
{
if (aStyle.IsCalcUnit()) {
if (aStyle.CalcHasPercent()) {
return PR_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 PR_TRUE;
}
if (eStyleUnit_Coord != aStyle.GetUnit())
return PR_FALSE;
aResult = aStyle.GetCoordValue();
NS_ASSERTION(aResult >= 0, "negative widths not allowed");
return PR_TRUE;
}
static PRBool
GetPercentHeight(const nsStyleCoord& aStyle,
nsIFrame* aFrame,
nscoord& aResult)
{
if (eStyleUnit_Percent != aStyle.GetUnit())
return PR_FALSE;
nsIFrame *f;
for (f = aFrame->GetParent(); f && !f->IsContainingBlock();
f = f->GetParent())
;
if (!f) {
NS_NOTREACHED("top of frame tree not a containing block");
return PR_FALSE;
}
const nsStylePosition *pos = f->GetStylePosition();
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 PR_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 PR_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");
}
aResult = NSToCoordRound(aStyle.GetPercentValue() * h);
return PR_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 PRBool
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 PR_FALSE;
PRInt32 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 PR_FALSE;
if (val == NS_STYLE_WIDTH_FIT_CONTENT) {
if (aProperty == PROP_WIDTH)
return PR_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 (val == NS_STYLE_WIDTH_MAX_CONTENT)
aResult = aFrame->GetPrefWidth(aRenderingContext);
else
aResult = aFrame->GetMinWidth(aRenderingContext);
return PR_TRUE;
}
#undef DEBUG_INTRINSIC_WIDTH
#ifdef DEBUG_INTRINSIC_WIDTH
static PRInt32 gNoiseIndent = 0;
#endif
/* static */ nscoord
nsLayoutUtils::IntrinsicForContainer(nsRenderingContext *aRenderingContext,
nsIFrame *aFrame,
IntrinsicWidthType aType)
{
NS_PRECONDITION(aFrame, "null frame");
NS_PRECONDITION(aType == MIN_WIDTH || aType == PREF_WIDTH, "bad type");
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stdout, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stdout);
printf(" %s intrinsic width for container:\n",
aType == MIN_WIDTH ? "min" : "pref");
#endif
nsIFrame::IntrinsicWidthOffsetData offsets =
aFrame->IntrinsicWidthOffsets(aRenderingContext);
const nsStylePosition *stylePos = aFrame->GetStylePosition();
PRUint8 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;
PRBool haveFixedMaxWidth = GetAbsoluteCoord(styleMaxWidth, maxw);
nscoord minw;
PRBool 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.
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 -moz-box-sizing.
boxSizing = NS_STYLE_BOX_SIZING_CONTENT;
} else if (styleWidth.GetUnit() != eStyleUnit_Coord &&
!(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(stdout, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stdout);
printf(" %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 h;
if (GetAbsoluteCoord(styleHeight, h) ||
GetPercentHeight(styleHeight, aFrame, h)) {
result =
NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
}
if (GetAbsoluteCoord(styleMaxHeight, h) ||
GetPercentHeight(styleMaxHeight, aFrame, h)) {
h = NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
if (h < result)
result = h;
}
if (GetAbsoluteCoord(styleMinHeight, h) ||
GetPercentHeight(styleMinHeight, aFrame, h)) {
h = NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
if (h > result)
result = h;
}
}
}
}
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 = offsets.hPadding;
float pctOutsideWidth = offsets.hPctPadding;
float pctTotal = 0.0f;
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->GetStyleDisplay();
if (aFrame->IsThemed(disp)) {
nsIntSize size(0, 0);
PRBool canOverride = PR_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(stdout, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stdout);
printf(" %s intrinsic width for container is %d twips.\n",
aType == MIN_WIDTH ? "min" : "pref", result);
#endif
return result;
}
/* static */ nscoord
nsLayoutUtils::ComputeWidthDependentValue(
nscoord aContainingBlockWidth,
const nsStyleCoord& aCoord)
{
NS_WARN_IF_FALSE(aContainingBlockWidth != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
if (aCoord.IsCoordPercentCalcUnit()) {
return nsRuleNode::ComputeCoordPercentCalc(aCoord, aContainingBlockWidth);
}
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 if (eStyleUnit_Enumerated == aCoord.GetUnit()) {
PRInt32 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 = NS_MAX(min, NS_MIN(pref, fill));
NS_ASSERTION(result >= 0, "width less than zero");
}
break;
case NS_STYLE_WIDTH_AVAILABLE:
result = aContainingBlockWidth -
(aBoxSizingToMarginEdge + aContentEdgeToBoxSizing);
}
} else {
NS_NOTREACHED("unexpected width value");
result = 0;
}
if (result < 0)
result = 0;
return 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;
}
#define MULDIV(a,b,c) (nscoord(PRInt64(a) * PRInt64(b) / PRInt64(c)))
/* static */ nsSize
nsLayoutUtils::ComputeSizeWithIntrinsicDimensions(
nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const nsIFrame::IntrinsicSize& aIntrinsicSize,
nsSize aIntrinsicRatio, nsSize aCBSize,
nsSize aMargin, nsSize aBorder, nsSize aPadding)
{
const nsStylePosition *stylePos = aFrame->GetStylePosition();
// 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 PRBool isAutoWidth = stylePos->mWidth.GetUnit() == eStyleUnit_Auto;
const PRBool isAutoHeight = IsAutoHeight(stylePos->mHeight, 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, stylePos->mWidth);
NS_ASSERTION(width >= 0, "negative result from ComputeWidthValue");
}
if (stylePos->mMaxWidth.GetUnit() != eStyleUnit_None) {
maxWidth = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
aFrame, aCBSize.width, boxSizingAdjust.width,
boxSizingToMarginEdgeWidth, stylePos->mMaxWidth);
NS_ASSERTION(maxWidth >= 0, "negative result from ComputeWidthValue");
} else {
maxWidth = nscoord_MAX;
}
minWidth = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
aFrame, aCBSize.width, boxSizingAdjust.width,
boxSizingToMarginEdgeWidth, stylePos->mMinWidth);
NS_ASSERTION(minWidth >= 0, "negative result from ComputeWidthValue");
if (!isAutoHeight) {
height = nsLayoutUtils::
ComputeHeightValue(aCBSize.height, stylePos->mHeight) -
boxSizingAdjust.height;
if (height < 0)
height = 0;
}
if (!IsAutoHeight(stylePos->mMaxHeight, aCBSize.height)) {
maxHeight = nsLayoutUtils::
ComputeHeightValue(aCBSize.height, stylePos->mMaxHeight) -
boxSizingAdjust.height;
if (maxHeight < 0)
maxHeight = 0;
} else {
maxHeight = nscoord_MAX;
}
if (!IsAutoHeight(stylePos->mMinHeight, aCBSize.height)) {
minHeight = nsLayoutUtils::
ComputeHeightValue(aCBSize.height, stylePos->mMinHeight) -
boxSizingAdjust.height;
if (minHeight < 0)
minHeight = 0;
} else {
minHeight = 0;
}
// Resolve percentage intrinsic width/height as necessary:
NS_ASSERTION(aCBSize.width != NS_UNCONSTRAINEDSIZE,
"Our containing block must not have unconstrained width!");
PRBool hasIntrinsicWidth, hasIntrinsicHeight;
nscoord intrinsicWidth, intrinsicHeight;
if (aIntrinsicSize.width.GetUnit() == eStyleUnit_Coord) {
hasIntrinsicWidth = PR_TRUE;
intrinsicWidth = aIntrinsicSize.width.GetCoordValue();
if (intrinsicWidth < 0)
intrinsicWidth = 0;
} else {
NS_ASSERTION(aIntrinsicSize.width.GetUnit() == eStyleUnit_None,
"unexpected unit");
hasIntrinsicWidth = PR_FALSE;
intrinsicWidth = 0;
}
if (aIntrinsicSize.height.GetUnit() == eStyleUnit_Coord) {
hasIntrinsicHeight = PR_TRUE;
intrinsicHeight = aIntrinsicSize.height.GetCoordValue();
if (intrinsicHeight < 0)
intrinsicHeight = 0;
} else {
NS_ASSERTION(aIntrinsicSize.height.GetUnit() == eStyleUnit_None,
"unexpected unit");
hasIntrinsicHeight = PR_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);
}
// 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 = tentHeight;
heightAtMinWidth = tentHeight;
}
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 = tentWidth;
widthAtMinHeight = tentWidth;
}
// The table at http://www.w3.org/TR/CSS21/visudet.html#min-max-widths :
if (tentWidth > maxWidth) {
if (tentHeight > maxHeight) {
if (PRInt64(maxWidth) * PRInt64(tentHeight) <=
PRInt64(maxHeight) * PRInt64(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 (PRInt64(minWidth) * PRInt64(tentHeight) <=
PRInt64(minHeight) * PRInt64(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;
}
}
} 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);
}
/* static */ nscoord
nsLayoutUtils::MinWidthFromInline(nsIFrame* aFrame,
nsRenderingContext* aRenderingContext)
{
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)
{
nsIFrame::InlinePrefWidthData data;
DISPLAY_PREF_WIDTH(aFrame, data.prevLines);
aFrame->AddInlinePrefWidth(aRenderingContext, &data);
data.ForceBreak(aRenderingContext);
return data.prevLines;
}
void
nsLayoutUtils::DrawString(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const PRUnichar* aString,
PRInt32 aLength,
nsPoint aPoint,
PRUint8 aDirection)
{
#ifdef IBMBIDI
nsresult rv = NS_ERROR_FAILURE;
nsPresContext* presContext = aFrame->PresContext();
if (presContext->BidiEnabled()) {
nsBidiPresUtils* bidiUtils = presContext->GetBidiUtils();
if (bidiUtils) {
if (aDirection == NS_STYLE_DIRECTION_INHERIT) {
aDirection = aFrame->GetStyleVisibility()->mDirection;
}
nsBidiDirection direction =
(NS_STYLE_DIRECTION_RTL == aDirection) ?
NSBIDI_RTL : NSBIDI_LTR;
rv = bidiUtils->RenderText(aString, aLength, direction,
presContext, *aContext, *aContext,
aPoint.x, aPoint.y);
}
}
if (NS_FAILED(rv))
#endif // IBMBIDI
{
aContext->SetTextRunRTL(PR_FALSE);
aContext->DrawString(aString, aLength, aPoint.x, aPoint.y);
}
}
nscoord
nsLayoutUtils::GetStringWidth(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const PRUnichar* aString,
PRInt32 aLength)
{
#ifdef IBMBIDI
nsPresContext* presContext = aFrame->PresContext();
if (presContext->BidiEnabled()) {
nsBidiPresUtils* bidiUtils = presContext->GetBidiUtils();
if (bidiUtils) {
const nsStyleVisibility* vis = aFrame->GetStyleVisibility();
nsBidiDirection direction =
(NS_STYLE_DIRECTION_RTL == vis->mDirection) ?
NSBIDI_RTL : NSBIDI_LTR;
return bidiUtils->MeasureTextWidth(aString, aLength,
direction, presContext, *aContext);
}
}
#endif // IBMBIDI
aContext->SetTextRunRTL(PR_FALSE);
return aContext->GetWidth(aString, aLength);
}
/* 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 */ PRBool
nsLayoutUtils::GetFirstLineBaseline(const nsIFrame* aFrame, nscoord* aResult)
{
LinePosition position;
if (!GetFirstLinePosition(aFrame, &position))
return PR_FALSE;
*aResult = position.mBaseline;
return PR_TRUE;
}
/* static */ PRBool
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 PR_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 PR_TRUE;
}
return PR_FALSE;
}
if (fType == nsGkAtoms::fieldSetFrame) {
LinePosition kidPosition;
nsIFrame* kid = aFrame->GetFirstChild(nsnull);
// kid might be a legend frame here, but that's ok.
if (GetFirstLinePosition(kid, &kidPosition)) {
*aResult = kidPosition + kid->GetPosition().y;
return PR_TRUE;
}
return PR_FALSE;
}
// No baseline.
return PR_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->GetPosition().y;
return PR_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 PR_TRUE;
}
}
}
return PR_FALSE;
}
/* static */ PRBool
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 PR_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)) {
*aResult = kidBaseline + kid->GetPosition().y;
return PR_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->GetRect().YMost();
return PR_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 PR_TRUE;
}
}
}
return PR_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->GetRect().y - child->GetRelativeOffset().y;
contentBottom = NS_MAX(contentBottom,
nsLayoutUtils::CalculateContentBottom(child) + offset);
}
else {
contentBottom = NS_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) {
nsBlockFrame* blockFrame = GetAsBlock(aFrame);
nsIAtom* childList = nsnull;
PRIntn nextListID = 0;
do {
if (childList == nsnull && blockFrame) {
contentBottom = NS_MAX(contentBottom, CalculateBlockContentBottom(blockFrame));
}
else if (childList != nsGkAtoms::overflowList &&
childList != nsGkAtoms::excessOverflowContainersList &&
childList != nsGkAtoms::overflowOutOfFlowList)
{
for (nsIFrame* child = aFrame->GetFirstChild(childList);
child; child = child->GetNextSibling())
{
nscoord offset = child->GetRect().y - child->GetRelativeOffset().y;
contentBottom = NS_MAX(contentBottom,
CalculateContentBottom(child) + offset);
}
}
childList = aFrame->GetAdditionalChildListName(nextListID);
nextListID++;
} while (childList);
}
return contentBottom;
}
/* static */ nsIFrame*
nsLayoutUtils::GetClosestLayer(nsIFrame* aFrame)
{
nsIFrame* layer;
for (layer = aFrame; layer; layer = layer->GetParent()) {
if (layer->GetStyleDisplay()->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 = gfxPattern::FILTER_GOOD;
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
if (!mozilla::supports_neon()) {
defaultFilter = gfxPattern::FILTER_NEAREST;
}
#endif
nsIFrame *frame = nsCSSRendering::IsCanvasFrame(aForFrame) ?
nsCSSRendering::FindBackgroundStyleFrame(aForFrame) : aForFrame;
switch (frame->GetStyleSVG()->mImageRendering) {
case NS_STYLE_IMAGE_RENDERING_OPTIMIZESPEED:
return gfxPattern::FILTER_FAST;
case NS_STYLE_IMAGE_RENDERING_OPTIMIZEQUALITY:
return gfxPattern::FILTER_BEST;
case NS_STYLE_IMAGE_RENDERING_CRISPEDGES:
return gfxPattern::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, PRInt32 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
PRPackedBool mShouldDraw;
// PR_TRUE iff the CTM of the rendering context needs to be reset to the
// identity matrix before drawing
PRPackedBool mResetCTM;
SnappedImageDrawingParameters()
: mShouldDraw(PR_FALSE)
, mResetCTM(PR_FALSE)
{}
SnappedImageDrawingParameters(const gfxMatrix& aUserSpaceToImageSpace,
const gfxRect& aFillRect,
const nsIntRect& aSubimage,
PRBool aResetCTM)
: mUserSpaceToImageSpace(aUserSpaceToImageSpace)
, mFillRect(aFillRect)
, mSubimage(aSubimage)
, mShouldDraw(PR_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,
PRInt32 aAppUnitsPerDevPixel,
const nsRect aDest,
const nsRect aFill,
const nsPoint aAnchor,
const nsRect aDirty,
const nsIntSize aImageSize)
{
if (aDest.IsEmpty() || aFill.IsEmpty())
return SnappedImageDrawingParameters();
gfxRect devPixelDest =
nsLayoutUtils::RectToGfxRect(aDest, aAppUnitsPerDevPixel);
gfxRect devPixelFill =
nsLayoutUtils::RectToGfxRect(aFill, aAppUnitsPerDevPixel);
gfxRect devPixelDirty =
nsLayoutUtils::RectToGfxRect(aDirty, aAppUnitsPerDevPixel);
PRBool ignoreScale = PR_FALSE;
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
ignoreScale = PR_TRUE;
#endif
gfxRect fill = devPixelFill;
PRBool didSnap = aCtx->UserToDevicePixelSnapped(fill, ignoreScale);
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);
gfxMatrix currentMatrix = aCtx->CurrentMatrix();
if (didSnap) {
NS_ASSERTION(!currentMatrix.HasNonAxisAlignedTransform(),
"How did we snap, then?");
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,
PRUint32 aImageFlags)
{
PRInt32 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,
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)
{
PRInt32 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,
gfxASurface::ImageFormatARGB32, aFilter);
}
/* static */ nsresult
nsLayoutUtils::DrawSingleUnscaledImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsPoint& aDest,
const nsRect* aDirty,
PRUint32 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, aImageFlags);
}
/* static */ nsresult
nsLayoutUtils::DrawSingleImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aDirty,
PRUint32 aImageFlags,
const nsRect* aSourceArea)
{
nsIntSize imageSize;
if (aImage->GetType() == imgIContainer::TYPE_VECTOR) {
imageSize.width = nsPresContext::AppUnitsToIntCSSPixels(aDest.width);
imageSize.height = nsPresContext::AppUnitsToIntCSSPixels(aDest.height);
} else {
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, aImageFlags);
}
/* static */ void
nsLayoutUtils::ComputeSizeForDrawing(imgIContainer *aImage,
nsIntSize& aImageSize, /*outparam*/
PRBool& aGotWidth, /*outparam*/
PRBool& aGotHeight /*outparam*/)
{
aGotWidth = NS_SUCCEEDED(aImage->GetWidth(&aImageSize.width));
aGotHeight = NS_SUCCEEDED(aImage->GetHeight(&aImageSize.height));
if ((aGotWidth && aGotHeight) || // Trivial success!
(!aGotWidth && !aGotHeight)) { // Trivial failure!
return;
}
// If we get here, we succeeded at querying *either* the width *or* the
// height, but not both.
NS_ASSERTION(aImage->GetType() == imgIContainer::TYPE_VECTOR,
"GetWidth and GetHeight should only fail for vector images");
nsIFrame* rootFrame = aImage->GetRootLayoutFrame();
NS_ASSERTION(rootFrame,
"We should have a VectorImage, which should have a rootFrame");
// This falls back on failure, if we somehow end up without a rootFrame.
nsSize ratio = rootFrame ? rootFrame->GetIntrinsicRatio() : nsSize(0,0);
if (!aGotWidth) { // Have height, missing width
if (ratio.height != 0) { // don't divide by zero
aImageSize.width = NSToCoordRound(aImageSize.height *
float(ratio.width) /
float(ratio.height));
aGotWidth = PR_TRUE;
}
} else { // Have width, missing height
if (ratio.width != 0) { // don't divide by zero
aImageSize.height = NSToCoordRound(aImageSize.width *
float(ratio.height) /
float(ratio.width));
aGotHeight = PR_TRUE;
}
}
}
/* static */ nsresult
nsLayoutUtils::DrawImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
PRUint32 aImageFlags)
{
nsIntSize imageSize;
PRBool gotHeight, gotWidth;
ComputeSizeForDrawing(aImage, imageSize, gotWidth, gotHeight);
// fallback size based on aFill.
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, 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));
}
void
nsLayoutUtils::SetFontFromStyle(nsRenderingContext* aRC, nsStyleContext* aSC)
{
const nsStyleFont* font = aSC->GetStyleFont();
const nsStyleVisibility* visibility = aSC->GetStyleVisibility();
aRC->SetFont(font->mFont, visibility->mLanguage,
aSC->PresContext()->GetUserFontSet());
}
static PRBool 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 PR_TRUE;
}
/* static */ PRBool
nsLayoutUtils::HasNonZeroCorner(const nsStyleCorners& aCorners)
{
NS_FOR_CSS_HALF_CORNERS(corner) {
if (NonZeroStyleCoord(aCorners.Get(corner)))
return PR_TRUE;
}
return PR_FALSE;
}
// aCorner is a "full corner" value, i.e. NS_CORNER_TOP_LEFT etc
static PRBool IsCornerAdjacentToSide(PRUint8 aCorner, mozilla::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 */ PRBool
nsLayoutUtils::HasNonZeroCornerOnSide(const nsStyleCorners& aCorners,
mozilla::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 PR_TRUE;
}
return PR_FALSE;
}
/* static */ nsTransparencyMode
nsLayoutUtils::GetFrameTransparency(nsIFrame* aBackgroundFrame,
nsIFrame* aCSSRootFrame) {
if (aCSSRootFrame->GetStyleContext()->GetStyleDisplay()->mOpacity < 1.0f)
return eTransparencyTransparent;
if (HasNonZeroCorner(aCSSRootFrame->GetStyleContext()->GetStyleBorder()->mBorderRadius))
return eTransparencyTransparent;
if (aCSSRootFrame->GetStyleDisplay()->mAppearance == NS_THEME_WIN_GLASS)
return eTransparencyGlass;
if (aCSSRootFrame->GetStyleDisplay()->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->GetFirstChild(nsnull)) {
return eTransparencyOpaque;
}
nsStyleContext* bgSC;
if (!nsCSSRendering::FindBackground(aBackgroundFrame->PresContext(),
aBackgroundFrame, &bgSC)) {
return eTransparencyTransparent;
}
const nsStyleBackground* bg = bgSC->GetStyleBackground();
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 */ PRBool
nsLayoutUtils::IsPopup(nsIFrame* aFrame)
{
nsIAtom* frameType = aFrame->GetType();
// We're a popup if we're the list control frame dropdown for a combobox.
if (frameType == nsGkAtoms::listControlFrame) {
nsListControlFrame* listControlFrame = static_cast<nsListControlFrame*>(aFrame);
if (listControlFrame) {
return listControlFrame->IsInDropDownMode();
}
}
// ... or if we're a XUL menupopup frame.
return (frameType == nsGkAtoms::menuPopupFrame);
}
/* static */ nsIFrame*
nsLayoutUtils::GetDisplayRootFrame(nsIFrame* aFrame)
{
nsIFrame* f = aFrame;
for (;;) {
if (IsPopup(f))
return f;
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent)
return f;
f = parent;
}
}
static PRBool
IsNonzeroCoord(const nsStyleCoord& aCoord)
{
if (eStyleUnit_Coord == aCoord.GetUnit())
return aCoord.GetCoordValue() != 0;
return PR_FALSE;
}
/* static */ PRUint32
nsLayoutUtils::GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
const nsStyleText* aStyleText,
const nsStyleFont* aStyleFont)
{
PRUint32 result = 0;
if (IsNonzeroCoord(aStyleText->mLetterSpacing)) {
result |= gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES;
}
switch (aStyleContext->GetStyleSVG()->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, NS_MAX(aR1.width, aR2.width),
NS_MAX(aR1.height, aR2.height));
nscoord VStripStart = NS_MIN(aR1.width, aR2.width);
nscoord HStripStart = NS_MIN(aR1.height, aR2.height);
*aVStrip = unionRect;
aVStrip->x += VStripStart;
aVStrip->width -= VStripStart;
*aHStrip = unionRect;
aHStrip->y += HStripStart;
aHStrip->height -= HStripStart;
}
nsDeviceContext*
nsLayoutUtils::GetDeviceContextForScreenInfo(nsIDocShell* aDocShell)
{
nsCOMPtr<nsIDocShell> docShell = aDocShell;
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 nsnull;
}
win->EnsureSizeUpToDate();
nsRefPtr<nsPresContext> presContext;
docShell->GetPresContext(getter_AddRefs(presContext));
if (presContext) {
nsDeviceContext* context = presContext->DeviceContext();
if (context) {
return context;
}
}
nsCOMPtr<nsIDocShellTreeItem> curItem = do_QueryInterface(docShell);
nsCOMPtr<nsIDocShellTreeItem> parentItem;
curItem->GetParent(getter_AddRefs(parentItem));
docShell = do_QueryInterface(parentItem);
}
return nsnull;
}
/* static */ PRBool
nsLayoutUtils::IsReallyFixedPos(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame->GetParent(),
"IsReallyFixedPos called on frame not in tree");
NS_PRECONDITION(aFrame->GetStyleDisplay()->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(nsIDOMElement *aElement,
PRUint32 aSurfaceFlags)
{
SurfaceFromElementResult result;
nsresult rv;
nsCOMPtr<nsINode> node = do_QueryInterface(aElement);
PRBool forceCopy = (aSurfaceFlags & SFE_WANT_NEW_SURFACE) != 0;
PRBool wantImageSurface = (aSurfaceFlags & SFE_WANT_IMAGE_SURFACE) != 0;
if (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA) {
forceCopy = PR_TRUE;
wantImageSurface = PR_TRUE;
}
// If it's a <canvas>, we may be able to just grab its internal surface
nsCOMPtr<nsIDOMHTMLCanvasElement> domCanvas = do_QueryInterface(aElement);
if (node && domCanvas) {
nsHTMLCanvasElement *canvas = static_cast<nsHTMLCanvasElement*>(domCanvas.get());
nsIntSize nssize = canvas->GetSize();
gfxIntSize size(nssize.width, nssize.height);
nsRefPtr<gfxASurface> surf;
if (!forceCopy && canvas->CountContexts() == 1) {
nsICanvasRenderingContextInternal *srcCanvas = canvas->GetContextAtIndex(0);
rv = srcCanvas->GetThebesSurface(getter_AddRefs(surf));
if (NS_FAILED(rv))
surf = nsnull;
}
if (surf && wantImageSurface && surf->GetType() != gfxASurface::SurfaceTypeImage)
surf = nsnull;
if (!surf) {
if (wantImageSurface) {
surf = new gfxImageSurface(size, gfxASurface::ImageFormatARGB32);
} else {
surf = gfxPlatform::GetPlatform()->CreateOffscreenSurface(size, gfxASurface::CONTENT_COLOR_ALPHA);
}
nsRefPtr<gfxContext> ctx = new gfxContext(surf);
// XXX shouldn't use the external interface, but maybe we can layerify this
rv = (static_cast<nsICanvasElementExternal*>(canvas))->RenderContextsExternal(ctx, gfxPattern::FILTER_NEAREST);
if (NS_FAILED(rv))
return result;
}
// Ensure that any future changes to the canvas trigger proper invalidation,
// in case this is being used by -moz-element()
canvas->MarkContextClean();
if (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA) {
// we can modify this surface since we force a copy above when
// when NO_PREMULTIPLY_ALPHA is set
gfxUtils::UnpremultiplyImageSurface(static_cast<gfxImageSurface*>(surf.get()));
}
result.mSurface = surf;
result.mSize = size;
result.mPrincipal = node->NodePrincipal();
result.mIsWriteOnly = canvas->IsWriteOnly();
return result;
}
#ifdef MOZ_MEDIA
// Maybe it's <video>?
nsCOMPtr<nsIDOMHTMLVideoElement> ve = do_QueryInterface(aElement);
if (node && ve) {
nsHTMLVideoElement *video = static_cast<nsHTMLVideoElement*>(ve.get());
unsigned short readyState;
if (NS_SUCCEEDED(ve->GetReadyState(&readyState)) &&
(readyState == nsIDOMHTMLMediaElement::HAVE_NOTHING ||
readyState == nsIDOMHTMLMediaElement::HAVE_METADATA)) {
result.mIsStillLoading = PR_TRUE;
return result;
}
// If it doesn't have a principal, just bail
nsCOMPtr<nsIPrincipal> principal = video->GetCurrentPrincipal();
if (!principal)
return result;
ImageContainer *container = video->GetImageContainer();
if (!container)
return result;
gfxIntSize size;
nsRefPtr<gfxASurface> surf = container->GetCurrentAsSurface(&size);
if (!surf)
return result;
if (wantImageSurface && surf->GetType() != gfxASurface::SurfaceTypeImage) {
nsRefPtr<gfxImageSurface> imgSurf =
new gfxImageSurface(size, gfxASurface::ImageFormatARGB32);
if (!imgSurf)
return result;
nsRefPtr<gfxContext> ctx = new gfxContext(imgSurf);
if (!ctx)
return result;
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->DrawSurface(surf, size);
surf = imgSurf;
}
result.mSurface = surf;
result.mSize = size;
result.mPrincipal = principal.forget();
result.mIsWriteOnly = PR_FALSE;
return result;
}
#endif
// Finally, check if it's a normal image
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(aElement);
if (!imageLoader)
return result;
// Push a null JSContext on the stack so that code that runs within
// the below code doesn't think it's being called by JS. See bug
// 604262.
nsCxPusher pusher;
pusher.PushNull();
nsCOMPtr<imgIRequest> imgRequest;
rv = imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
if (NS_FAILED(rv) || !imgRequest)
return result;
PRUint32 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;
}
// In case of data: URIs, we want to ignore principals;
// they should have the originating content's principal,
// but that's broken at the moment in imgLib.
nsCOMPtr<nsIURI> uri;
rv = imgRequest->GetURI(getter_AddRefs(uri));
if (NS_FAILED(rv))
return result;
PRBool isDataURI = PR_FALSE;
rv = uri->SchemeIs("data", &isDataURI);
if (NS_FAILED(rv))
return result;
// Data URIs are always OK; set the principal
// to null to indicate that.
nsCOMPtr<nsIPrincipal> principal;
if (!isDataURI) {
rv = imgRequest->GetImagePrincipal(getter_AddRefs(principal));
if (NS_FAILED(rv) || !principal)
return result;
}
nsCOMPtr<imgIContainer> imgContainer;
rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
if (NS_FAILED(rv) || !imgContainer)
return result;
PRUint32 whichFrame = (aSurfaceFlags & SFE_WANT_FIRST_FRAME)
? (PRUint32) imgIContainer::FRAME_FIRST
: (PRUint32) imgIContainer::FRAME_CURRENT;
PRUint32 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;
nsRefPtr<gfxASurface> framesurf;
rv = imgContainer->GetFrame(whichFrame,
frameFlags,
getter_AddRefs(framesurf));
if (NS_FAILED(rv))
return result;
PRInt32 imgWidth, imgHeight;
rv = imgContainer->GetWidth(&imgWidth);
rv |= imgContainer->GetHeight(&imgHeight);
if (NS_FAILED(rv))
return result;
if (wantImageSurface && framesurf->GetType() != gfxASurface::SurfaceTypeImage) {
forceCopy = PR_TRUE;
}
nsRefPtr<gfxASurface> gfxsurf = framesurf;
if (forceCopy) {
if (wantImageSurface) {
gfxsurf = new gfxImageSurface (gfxIntSize(imgWidth, imgHeight), gfxASurface::ImageFormatARGB32);
} else {
gfxsurf = gfxPlatform::GetPlatform()->CreateOffscreenSurface(gfxIntSize(imgWidth, imgHeight),
gfxASurface::CONTENT_COLOR_ALPHA);
}
nsRefPtr<gfxContext> ctx = new gfxContext(gfxsurf);
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->SetSource(framesurf);
ctx->Paint();
}
result.mSurface = gfxsurf;
result.mSize = gfxIntSize(imgWidth, imgHeight);
result.mPrincipal = principal.forget();
// SVG images could have <foreignObject> and/or <image> elements that load
// content from another domain. For safety, they make the canvas write-only.
// XXXdholbert We could probably be more permissive here if we check that our
// helper SVG document has no elements that could load remote content.
result.mIsWriteOnly = (imgContainer->GetType() == imgIContainer::TYPE_VECTOR);
result.mImageRequest = imgRequest.forget();
return result;
}
/* static */
nsIContent*
nsLayoutUtils::GetEditableRootContentByContentEditable(nsIDocument* aDocument)
{
// If the document is in designMode we should return NULL.
if (!aDocument || aDocument->HasFlag(NODE_IS_EDITABLE)) {
return nsnull;
}
// 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 nsnull;
}
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 nsnull;
}
#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.
PRInt32 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");
PRInt32 listIndex = 0;
nsIAtom* childList = nsnull;
do {
for (nsIFrame* child = aSubtreeRoot->GetFirstChild(childList); child;
child = child->GetNextSibling()) {
nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(child);
}
childList = aSubtreeRoot->GetAdditionalChildListName(listIndex++);
} while (childList);
}
#endif
/* static */
nsresult
nsLayoutUtils::GetFontFacesForFrames(nsIFrame* aFrame,
nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
if (aFrame->GetType() == nsGkAtoms::textFrame) {
return GetFontFacesForText(aFrame, 0, PR_INT32_MAX, PR_FALSE,
aFontFaceList);
}
while (aFrame) {
nsIAtom* childLists[] = { nsnull, nsGkAtoms::popupList };
for (int i = 0; i < NS_ARRAY_LENGTH(childLists); ++i) {
nsFrameList children(aFrame->GetChildList(childLists[i]));
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
if (child->GetPrevContinuation()) {
continue;
}
child = nsPlaceholderFrame::GetRealFrameFor(child);
nsresult rv = GetFontFacesForFrames(child, aFontFaceList);
NS_ENSURE_SUCCESS(rv, rv);
}
}
aFrame = GetNextContinuationOrSpecialSibling(aFrame);
}
return NS_OK;
}
/* static */
nsresult
nsLayoutUtils::GetFontFacesForText(nsIFrame* aFrame,
PRInt32 aStartOffset, PRInt32 aEndOffset,
PRBool aFollowContinuations,
nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
if (aFrame->GetType() != nsGkAtoms::textFrame) {
return NS_OK;
}
nsTextFrame* curr = static_cast<nsTextFrame*>(aFrame);
do {
PRInt32 offset = curr->GetContentOffset();
PRInt32 fstart = NS_MAX(offset, aStartOffset);
PRInt32 fend = NS_MIN(curr->GetContentEnd(), aEndOffset);
if (fstart >= fend) {
continue;
}
// overlapping with the offset we want
curr->EnsureTextRun();
gfxTextRun* textRun = curr->GetTextRun();
NS_ENSURE_TRUE(textRun, NS_ERROR_OUT_OF_MEMORY);
gfxSkipCharsIterator iter(textRun->GetSkipChars());
PRUint32 skipStart = iter.ConvertOriginalToSkipped(fstart - offset);
PRUint32 skipEnd = iter.ConvertOriginalToSkipped(fend - offset);
aFontFaceList->AddFontsFromTextRun(textRun,
skipStart, skipEnd - skipStart,
curr);
} while (aFollowContinuations &&
(curr = static_cast<nsTextFrame*>(curr->GetNextContinuation())));
return NS_OK;
}
/* static */
void
nsLayoutUtils::Shutdown()
{
if (sContentMap) {
delete sContentMap;
sContentMap = NULL;
}
}
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,
PRInt32 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, PR_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, PR_TRUE);
}
nsReflowFrameRunnable::nsReflowFrameRunnable(nsIFrame* aFrame,
nsIPresShell::IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd)
: mWeakFrame(aFrame),
mIntrinsicDirty(aIntrinsicDirty),
mBitToAdd(aBitToAdd)
{
}
NS_IMETHODIMP
nsReflowFrameRunnable::Run()
{
if (mWeakFrame.IsAlive()) {
mWeakFrame->PresContext()->PresShell()->
FrameNeedsReflow(mWeakFrame, mIntrinsicDirty, mBitToAdd);
}
return NS_OK;
}
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