gecko/layout/svg/nsFilterInstance.cpp
2015-12-13 14:02:34 -08:00

608 lines
20 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Main header first:
#include "nsFilterInstance.h"
// MFBT headers next:
#include "mozilla/UniquePtr.h"
// Keep others in (case-insensitive) order:
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "gfxUtils.h"
#include "mozilla/gfx/Helpers.h"
#include "mozilla/gfx/PatternHelpers.h"
#include "nsISVGChildFrame.h"
#include "nsCSSFilterInstance.h"
#include "nsSVGFilterInstance.h"
#include "nsSVGFilterPaintCallback.h"
#include "nsSVGUtils.h"
#include "SVGContentUtils.h"
#include "FilterSupport.h"
#include "gfx2DGlue.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
FilterDescription
nsFilterInstance::GetFilterDescription(nsIContent* aFilteredElement,
const nsTArray<nsStyleFilter>& aFilterChain,
const UserSpaceMetrics& aMetrics,
const gfxRect& aBBox,
nsTArray<RefPtr<SourceSurface>>& aOutAdditionalImages)
{
gfxMatrix unused; // aPaintTransform arg not used since we're not painting
nsFilterInstance instance(nullptr, aFilteredElement, aMetrics,
aFilterChain, nullptr, unused,
nullptr, nullptr, nullptr, &aBBox);
if (!instance.IsInitialized()) {
return FilterDescription();
}
return instance.ExtractDescriptionAndAdditionalImages(aOutAdditionalImages);
}
static UniquePtr<UserSpaceMetrics>
UserSpaceMetricsForFrame(nsIFrame* aFrame)
{
if (aFrame->GetContent()->IsSVGElement()) {
nsSVGElement* element = static_cast<nsSVGElement*>(aFrame->GetContent());
return MakeUnique<SVGElementMetrics>(element);
}
return MakeUnique<NonSVGFrameUserSpaceMetrics>(aFrame);
}
nsresult
nsFilterInstance::PaintFilteredFrame(nsIFrame *aFilteredFrame,
DrawTarget* aDrawTarget,
const gfxMatrix& aTransform,
nsSVGFilterPaintCallback *aPaintCallback,
const nsRegion *aDirtyArea)
{
auto& filterChain = aFilteredFrame->StyleSVGReset()->mFilters;
UniquePtr<UserSpaceMetrics> metrics = UserSpaceMetricsForFrame(aFilteredFrame);
nsFilterInstance instance(aFilteredFrame, aFilteredFrame->GetContent(), *metrics,
filterChain, aPaintCallback, aTransform,
aDirtyArea, nullptr, nullptr, nullptr);
if (!instance.IsInitialized()) {
return NS_OK;
}
return instance.Render(aDrawTarget);
}
nsRegion
nsFilterInstance::GetPostFilterDirtyArea(nsIFrame *aFilteredFrame,
const nsRegion& aPreFilterDirtyRegion)
{
if (aPreFilterDirtyRegion.IsEmpty()) {
return nsRegion();
}
gfxMatrix unused; // aPaintTransform arg not used since we're not painting
auto& filterChain = aFilteredFrame->StyleSVGReset()->mFilters;
UniquePtr<UserSpaceMetrics> metrics = UserSpaceMetricsForFrame(aFilteredFrame);
nsFilterInstance instance(aFilteredFrame, aFilteredFrame->GetContent(), *metrics,
filterChain, nullptr, unused, nullptr,
&aPreFilterDirtyRegion);
if (!instance.IsInitialized()) {
return nsRegion();
}
// We've passed in the source's dirty area so the instance knows about it.
// Now we can ask the instance to compute the area of the filter output
// that's dirty.
return instance.ComputePostFilterDirtyRegion();
}
nsRegion
nsFilterInstance::GetPreFilterNeededArea(nsIFrame *aFilteredFrame,
const nsRegion& aPostFilterDirtyRegion)
{
gfxMatrix unused; // aPaintTransform arg not used since we're not painting
auto& filterChain = aFilteredFrame->StyleSVGReset()->mFilters;
UniquePtr<UserSpaceMetrics> metrics = UserSpaceMetricsForFrame(aFilteredFrame);
nsFilterInstance instance(aFilteredFrame, aFilteredFrame->GetContent(), *metrics,
filterChain, nullptr, unused,
&aPostFilterDirtyRegion);
if (!instance.IsInitialized()) {
return nsRect();
}
// Now we can ask the instance to compute the area of the source
// that's needed.
return instance.ComputeSourceNeededRect();
}
nsRect
nsFilterInstance::GetPostFilterBounds(nsIFrame *aFilteredFrame,
const gfxRect *aOverrideBBox,
const nsRect *aPreFilterBounds)
{
MOZ_ASSERT(!(aFilteredFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) ||
!(aFilteredFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY),
"Non-display SVG do not maintain visual overflow rects");
nsRegion preFilterRegion;
nsRegion* preFilterRegionPtr = nullptr;
if (aPreFilterBounds) {
preFilterRegion = *aPreFilterBounds;
preFilterRegionPtr = &preFilterRegion;
}
gfxMatrix unused; // aPaintTransform arg not used since we're not painting
auto& filterChain = aFilteredFrame->StyleSVGReset()->mFilters;
UniquePtr<UserSpaceMetrics> metrics = UserSpaceMetricsForFrame(aFilteredFrame);
nsFilterInstance instance(aFilteredFrame, aFilteredFrame->GetContent(), *metrics,
filterChain, nullptr, unused, nullptr,
preFilterRegionPtr, aPreFilterBounds,
aOverrideBBox);
if (!instance.IsInitialized()) {
return nsRect();
}
return instance.ComputePostFilterExtents();
}
nsFilterInstance::nsFilterInstance(nsIFrame *aTargetFrame,
nsIContent* aTargetContent,
const UserSpaceMetrics& aMetrics,
const nsTArray<nsStyleFilter>& aFilterChain,
nsSVGFilterPaintCallback *aPaintCallback,
const gfxMatrix& aPaintTransform,
const nsRegion *aPostFilterDirtyRegion,
const nsRegion *aPreFilterDirtyRegion,
const nsRect *aPreFilterVisualOverflowRectOverride,
const gfxRect *aOverrideBBox)
: mTargetFrame(aTargetFrame)
, mTargetContent(aTargetContent)
, mMetrics(aMetrics)
, mPaintCallback(aPaintCallback)
, mPaintTransform(aPaintTransform)
, mInitialized(false)
{
if (aOverrideBBox) {
mTargetBBox = *aOverrideBBox;
} else {
MOZ_ASSERT(mTargetFrame, "Need to supply a frame when there's no aOverrideBBox");
mTargetBBox = nsSVGUtils::GetBBox(mTargetFrame);
}
// Compute user space to filter space transforms.
nsresult rv = ComputeUserSpaceToFilterSpaceScale();
if (NS_FAILED(rv)) {
return;
}
gfxRect targetBBoxInFilterSpace = UserSpaceToFilterSpace(mTargetBBox);
targetBBoxInFilterSpace.RoundOut();
if (!gfxUtils::GfxRectToIntRect(targetBBoxInFilterSpace, &mTargetBBoxInFilterSpace)) {
// The target's bbox is way too big if there is float->int overflow.
return;
}
// Get various transforms:
gfxMatrix filterToUserSpace(mFilterSpaceToUserSpaceScale.width, 0.0f,
0.0f, mFilterSpaceToUserSpaceScale.height,
0.0f, 0.0f);
// Only used (so only set) when we paint:
if (mPaintCallback) {
mFilterSpaceToDeviceSpaceTransform = filterToUserSpace * mPaintTransform;
}
mFilterSpaceToFrameSpaceInCSSPxTransform =
filterToUserSpace * GetUserSpaceToFrameSpaceInCSSPxTransform();
// mFilterSpaceToFrameSpaceInCSSPxTransform is always invertible
mFrameSpaceInCSSPxToFilterSpaceTransform =
mFilterSpaceToFrameSpaceInCSSPxTransform;
mFrameSpaceInCSSPxToFilterSpaceTransform.Invert();
nsIntRect targetBounds;
if (aPreFilterVisualOverflowRectOverride) {
targetBounds =
FrameSpaceToFilterSpace(aPreFilterVisualOverflowRectOverride);
} else if (mTargetFrame) {
nsRect preFilterVOR = mTargetFrame->GetPreEffectsVisualOverflowRect();
targetBounds = FrameSpaceToFilterSpace(&preFilterVOR);
}
mTargetBounds.UnionRect(mTargetBBoxInFilterSpace, targetBounds);
// Build the filter graph.
rv = BuildPrimitives(aFilterChain);
if (NS_FAILED(rv)) {
return;
}
if (mPrimitiveDescriptions.IsEmpty()) {
// Nothing should be rendered.
return;
}
// Convert the passed in rects from frame space to filter space:
mPostFilterDirtyRegion = FrameSpaceToFilterSpace(aPostFilterDirtyRegion);
mPreFilterDirtyRegion = FrameSpaceToFilterSpace(aPreFilterDirtyRegion);
mInitialized = true;
}
nsresult
nsFilterInstance::ComputeUserSpaceToFilterSpaceScale()
{
gfxMatrix canvasTransform;
if (mTargetFrame) {
canvasTransform = nsSVGUtils::GetCanvasTM(mTargetFrame);
if (canvasTransform.IsSingular()) {
// Nothing should be rendered.
return NS_ERROR_FAILURE;
}
}
mUserSpaceToFilterSpaceScale = canvasTransform.ScaleFactors(true);
if (mUserSpaceToFilterSpaceScale.width <= 0.0f ||
mUserSpaceToFilterSpaceScale.height <= 0.0f) {
// Nothing should be rendered.
return NS_ERROR_FAILURE;
}
mFilterSpaceToUserSpaceScale = gfxSize(1.0f / mUserSpaceToFilterSpaceScale.width,
1.0f / mUserSpaceToFilterSpaceScale.height);
return NS_OK;
}
gfxRect
nsFilterInstance::UserSpaceToFilterSpace(const gfxRect& aUserSpaceRect) const
{
gfxRect filterSpaceRect = aUserSpaceRect;
filterSpaceRect.Scale(mUserSpaceToFilterSpaceScale.width,
mUserSpaceToFilterSpaceScale.height);
return filterSpaceRect;
}
gfxRect
nsFilterInstance::FilterSpaceToUserSpace(const gfxRect& aFilterSpaceRect) const
{
gfxRect userSpaceRect = aFilterSpaceRect;
userSpaceRect.Scale(mFilterSpaceToUserSpaceScale.width,
mFilterSpaceToUserSpaceScale.height);
return userSpaceRect;
}
nsresult
nsFilterInstance::BuildPrimitives(const nsTArray<nsStyleFilter>& aFilterChain)
{
NS_ASSERTION(!mPrimitiveDescriptions.Length(),
"expected to start building primitives from scratch");
for (uint32_t i = 0; i < aFilterChain.Length(); i++) {
nsresult rv = BuildPrimitivesForFilter(aFilterChain[i]);
if (NS_FAILED(rv)) {
return rv;
}
}
mFilterDescription = FilterDescription(mPrimitiveDescriptions);
return NS_OK;
}
nsresult
nsFilterInstance::BuildPrimitivesForFilter(const nsStyleFilter& aFilter)
{
NS_ASSERTION(mUserSpaceToFilterSpaceScale.width > 0.0f &&
mFilterSpaceToUserSpaceScale.height > 0.0f,
"scale factors between spaces should be positive values");
if (aFilter.GetType() == NS_STYLE_FILTER_URL) {
// Build primitives for an SVG filter.
nsSVGFilterInstance svgFilterInstance(aFilter, mTargetContent,
mMetrics, mTargetBBox,
mUserSpaceToFilterSpaceScale,
mFilterSpaceToUserSpaceScale);
if (!svgFilterInstance.IsInitialized()) {
return NS_ERROR_FAILURE;
}
return svgFilterInstance.BuildPrimitives(mPrimitiveDescriptions, mInputImages);
}
// Build primitives for a CSS filter.
// If we don't have a frame, use opaque black for shadows with unspecified
// shadow colors.
nscolor shadowFallbackColor =
mTargetFrame ? mTargetFrame->StyleColor()->mColor : NS_RGB(0,0,0);
nsCSSFilterInstance cssFilterInstance(aFilter, shadowFallbackColor,
mTargetBounds,
mFrameSpaceInCSSPxToFilterSpaceTransform);
return cssFilterInstance.BuildPrimitives(mPrimitiveDescriptions);
}
void
nsFilterInstance::ComputeNeededBoxes()
{
if (mPrimitiveDescriptions.IsEmpty())
return;
nsIntRegion sourceGraphicNeededRegion;
nsIntRegion fillPaintNeededRegion;
nsIntRegion strokePaintNeededRegion;
FilterSupport::ComputeSourceNeededRegions(
mFilterDescription, mPostFilterDirtyRegion,
sourceGraphicNeededRegion, fillPaintNeededRegion, strokePaintNeededRegion);
sourceGraphicNeededRegion.And(sourceGraphicNeededRegion, mTargetBounds);
mSourceGraphic.mNeededBounds = sourceGraphicNeededRegion.GetBounds();
mFillPaint.mNeededBounds = fillPaintNeededRegion.GetBounds();
mStrokePaint.mNeededBounds = strokePaintNeededRegion.GetBounds();
}
nsresult
nsFilterInstance::BuildSourcePaint(SourceInfo *aSource,
DrawTarget* aTargetDT)
{
MOZ_ASSERT(mTargetFrame);
nsIntRect neededRect = aSource->mNeededBounds;
RefPtr<DrawTarget> offscreenDT =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
neededRect.Size(), SurfaceFormat::B8G8R8A8);
if (!offscreenDT) {
return NS_ERROR_OUT_OF_MEMORY;
}
gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform();
if (!deviceToFilterSpace.Invert()) {
return NS_ERROR_FAILURE;
}
if (!mPaintTransform.IsSingular()) {
RefPtr<gfxContext> gfx = new gfxContext(offscreenDT);
gfx->Save();
gfx->Multiply(mPaintTransform *
deviceToFilterSpace *
gfxMatrix::Translation(-neededRect.TopLeft()));
GeneralPattern pattern;
if (aSource == &mFillPaint) {
nsSVGUtils::MakeFillPatternFor(mTargetFrame, gfx, &pattern);
} else if (aSource == &mStrokePaint) {
nsSVGUtils::MakeStrokePatternFor(mTargetFrame, gfx, &pattern);
}
if (pattern.GetPattern()) {
offscreenDT->FillRect(ToRect(FilterSpaceToUserSpace(ThebesRect(neededRect))),
pattern);
}
gfx->Restore();
}
aSource->mSourceSurface = offscreenDT->Snapshot();
aSource->mSurfaceRect = neededRect;
return NS_OK;
}
nsresult
nsFilterInstance::BuildSourcePaints(DrawTarget* aTargetDT)
{
nsresult rv = NS_OK;
if (!mFillPaint.mNeededBounds.IsEmpty()) {
rv = BuildSourcePaint(&mFillPaint, aTargetDT);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!mStrokePaint.mNeededBounds.IsEmpty()) {
rv = BuildSourcePaint(&mStrokePaint, aTargetDT);
NS_ENSURE_SUCCESS(rv, rv);
}
return rv;
}
nsresult
nsFilterInstance::BuildSourceImage(DrawTarget* aTargetDT)
{
MOZ_ASSERT(mTargetFrame);
nsIntRect neededRect = mSourceGraphic.mNeededBounds;
if (neededRect.IsEmpty()) {
return NS_OK;
}
RefPtr<DrawTarget> offscreenDT =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
neededRect.Size(), SurfaceFormat::B8G8R8A8);
if (!offscreenDT) {
return NS_ERROR_OUT_OF_MEMORY;
}
gfxRect r = FilterSpaceToUserSpace(ThebesRect(neededRect));
r.RoundOut();
nsIntRect dirty;
if (!gfxUtils::GfxRectToIntRect(r, &dirty))
return NS_ERROR_FAILURE;
// SVG graphics paint to device space, so we need to set an initial device
// space to filter space transform on the gfxContext that SourceGraphic
// and SourceAlpha will paint to.
//
// (In theory it would be better to minimize error by having filtered SVG
// graphics temporarily paint to user space when painting the sources and
// only set a user space to filter space transform on the gfxContext
// (since that would eliminate the transform multiplications from user
// space to device space and back again). However, that would make the
// code more complex while being hard to get right without introducing
// subtle bugs, and in practice it probably makes no real difference.)
gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform();
if (!deviceToFilterSpace.Invert()) {
return NS_ERROR_FAILURE;
}
RefPtr<gfxContext> ctx = new gfxContext(offscreenDT);
ctx->SetMatrix(
ctx->CurrentMatrix().Translate(-neededRect.TopLeft()).
PreMultiply(deviceToFilterSpace));
mPaintCallback->Paint(*ctx, mTargetFrame, mPaintTransform, &dirty);
mSourceGraphic.mSourceSurface = offscreenDT->Snapshot();
mSourceGraphic.mSurfaceRect = neededRect;
return NS_OK;
}
nsresult
nsFilterInstance::Render(DrawTarget* aDrawTarget)
{
MOZ_ASSERT(mTargetFrame, "Need a frame for rendering");
nsIntRect filterRect =
mPostFilterDirtyRegion.GetBounds().Intersect(OutputFilterSpaceBounds());
gfxMatrix ctm = GetFilterSpaceToDeviceSpaceTransform();
if (filterRect.IsEmpty() || ctm.IsSingular()) {
return NS_OK;
}
AutoRestoreTransform autoRestoreTransform(aDrawTarget);
Matrix newTM = ToMatrix(ctm).PreTranslate(filterRect.x, filterRect.y) *
aDrawTarget->GetTransform();
aDrawTarget->SetTransform(newTM);
ComputeNeededBoxes();
nsresult rv = BuildSourceImage(aDrawTarget);
if (NS_FAILED(rv))
return rv;
rv = BuildSourcePaints(aDrawTarget);
if (NS_FAILED(rv))
return rv;
FilterSupport::RenderFilterDescription(
aDrawTarget, mFilterDescription, IntRectToRect(filterRect),
mSourceGraphic.mSourceSurface, mSourceGraphic.mSurfaceRect,
mFillPaint.mSourceSurface, mFillPaint.mSurfaceRect,
mStrokePaint.mSourceSurface, mStrokePaint.mSurfaceRect,
mInputImages, Point(0, 0));
return NS_OK;
}
nsRegion
nsFilterInstance::ComputePostFilterDirtyRegion()
{
if (mPreFilterDirtyRegion.IsEmpty()) {
return nsRegion();
}
nsIntRegion resultChangeRegion =
FilterSupport::ComputeResultChangeRegion(mFilterDescription,
mPreFilterDirtyRegion, nsIntRegion(), nsIntRegion());
return FilterSpaceToFrameSpace(resultChangeRegion);
}
nsRect
nsFilterInstance::ComputePostFilterExtents()
{
nsIntRegion postFilterExtents =
FilterSupport::ComputePostFilterExtents(mFilterDescription, mTargetBounds);
return FilterSpaceToFrameSpace(postFilterExtents.GetBounds());
}
nsRect
nsFilterInstance::ComputeSourceNeededRect()
{
ComputeNeededBoxes();
return FilterSpaceToFrameSpace(mSourceGraphic.mNeededBounds);
}
nsIntRect
nsFilterInstance::OutputFilterSpaceBounds() const
{
uint32_t numPrimitives = mPrimitiveDescriptions.Length();
if (numPrimitives <= 0)
return nsIntRect();
nsIntRect bounds =
mPrimitiveDescriptions[numPrimitives - 1].PrimitiveSubregion();
bool overflow;
IntSize surfaceSize =
nsSVGUtils::ConvertToSurfaceSize(bounds.Size(), &overflow);
bounds.SizeTo(surfaceSize);
return bounds;
}
nsIntRect
nsFilterInstance::FrameSpaceToFilterSpace(const nsRect* aRect) const
{
nsIntRect rect = OutputFilterSpaceBounds();
if (aRect) {
if (aRect->IsEmpty()) {
return nsIntRect();
}
gfxRect rectInCSSPx =
nsLayoutUtils::RectToGfxRect(*aRect, nsPresContext::AppUnitsPerCSSPixel());
gfxRect rectInFilterSpace =
mFrameSpaceInCSSPxToFilterSpaceTransform.TransformBounds(rectInCSSPx);
rectInFilterSpace.RoundOut();
nsIntRect intRect;
if (gfxUtils::GfxRectToIntRect(rectInFilterSpace, &intRect)) {
rect = intRect;
}
}
return rect;
}
nsRect
nsFilterInstance::FilterSpaceToFrameSpace(const nsIntRect& aRect) const
{
if (aRect.IsEmpty()) {
return nsRect();
}
gfxRect r(aRect.x, aRect.y, aRect.width, aRect.height);
r = mFilterSpaceToFrameSpaceInCSSPxTransform.TransformBounds(r);
// nsLayoutUtils::RoundGfxRectToAppRect rounds out.
return nsLayoutUtils::RoundGfxRectToAppRect(r, nsPresContext::AppUnitsPerCSSPixel());
}
nsIntRegion
nsFilterInstance::FrameSpaceToFilterSpace(const nsRegion* aRegion) const
{
if (!aRegion) {
return OutputFilterSpaceBounds();
}
nsIntRegion result;
nsRegionRectIterator it(*aRegion);
while (const nsRect* r = it.Next()) {
// FrameSpaceToFilterSpace rounds out, so this works.
result.Or(result, FrameSpaceToFilterSpace(r));
}
return result;
}
nsRegion
nsFilterInstance::FilterSpaceToFrameSpace(const nsIntRegion& aRegion) const
{
nsRegion result;
nsIntRegionRectIterator it(aRegion);
while (const nsIntRect* r = it.Next()) {
// FilterSpaceToFrameSpace rounds out, so this works.
result.Or(result, FilterSpaceToFrameSpace(*r));
}
return result;
}
gfxMatrix
nsFilterInstance::GetUserSpaceToFrameSpaceInCSSPxTransform() const
{
if (!mTargetFrame) {
return gfxMatrix();
}
return gfxMatrix::Translation(-nsSVGUtils::FrameSpaceInCSSPxToUserSpaceOffset(mTargetFrame));
}