mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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93826fc6b0
find . -type f | grep -v '\./obj' | grep -v '\.hg' | xargs sed -i 's/\(^\|[^A-Za-z0-9_]\)GFX_CONTENT_\(COLOR\|ALPHA\|COLOR_ALPHA\|SENTINEL\)\($\|[^A-Za-z0-9_]\)/\1gfxContentType::\2\3/g'
596 lines
19 KiB
C++
596 lines
19 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Main header first:
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#include "nsSVGFilterInstance.h"
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// Keep others in (case-insensitive) order:
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#include "gfxPlatform.h"
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#include "gfxUtils.h"
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#include "nsISVGChildFrame.h"
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#include "nsRenderingContext.h"
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#include "mozilla/dom/SVGFilterElement.h"
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#include "nsSVGFilterPaintCallback.h"
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#include "nsSVGUtils.h"
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#include "SVGContentUtils.h"
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#include "FilterSupport.h"
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#include "gfx2DGlue.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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float
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nsSVGFilterInstance::GetPrimitiveNumber(uint8_t aCtxType, float aValue) const
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{
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nsSVGLength2 val;
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val.Init(aCtxType, 0xff, aValue,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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float value;
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if (mPrimitiveUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
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value = nsSVGUtils::ObjectSpace(mTargetBBox, &val);
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} else {
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value = nsSVGUtils::UserSpace(mTargetFrame, &val);
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}
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switch (aCtxType) {
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case SVGContentUtils::X:
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return value * mFilterSpaceBounds.width / mFilterRegion.Width();
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case SVGContentUtils::Y:
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return value * mFilterSpaceBounds.height / mFilterRegion.Height();
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case SVGContentUtils::XY:
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default:
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return value * SVGContentUtils::ComputeNormalizedHypotenuse(
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mFilterSpaceBounds.width / mFilterRegion.Width(),
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mFilterSpaceBounds.height / mFilterRegion.Height());
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}
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}
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Point3D
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nsSVGFilterInstance::ConvertLocation(const Point3D& aPoint) const
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{
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nsSVGLength2 val[4];
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val[0].Init(SVGContentUtils::X, 0xff, aPoint.x,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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val[1].Init(SVGContentUtils::Y, 0xff, aPoint.y,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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// Dummy width/height values
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val[2].Init(SVGContentUtils::X, 0xff, 0,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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val[3].Init(SVGContentUtils::Y, 0xff, 0,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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gfxRect feArea = nsSVGUtils::GetRelativeRect(mPrimitiveUnits,
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val, mTargetBBox, mTargetFrame);
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gfxRect r = UserSpaceToFilterSpace(feArea);
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return Point3D(r.x, r.y, GetPrimitiveNumber(SVGContentUtils::XY, aPoint.z));
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}
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gfxRect
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nsSVGFilterInstance::UserSpaceToFilterSpace(const gfxRect& aRect) const
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{
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gfxRect r = aRect - mFilterRegion.TopLeft();
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r.Scale(mFilterSpaceBounds.width / mFilterRegion.Width(),
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mFilterSpaceBounds.height / mFilterRegion.Height());
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return r;
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}
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gfxPoint
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nsSVGFilterInstance::FilterSpaceToUserSpace(const gfxPoint& aPt) const
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{
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return gfxPoint(aPt.x * mFilterRegion.Width() / mFilterSpaceBounds.width + mFilterRegion.X(),
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aPt.y * mFilterRegion.Height() / mFilterSpaceBounds.height + mFilterRegion.Y());
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}
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gfxMatrix
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nsSVGFilterInstance::GetUserSpaceToFilterSpaceTransform() const
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{
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gfxFloat widthScale = mFilterSpaceBounds.width / mFilterRegion.Width();
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gfxFloat heightScale = mFilterSpaceBounds.height / mFilterRegion.Height();
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return gfxMatrix(widthScale, 0.0f,
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0.0f, heightScale,
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-mFilterRegion.X() * widthScale, -mFilterRegion.Y() * heightScale);
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}
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IntRect
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nsSVGFilterInstance::ComputeFilterPrimitiveSubregion(nsSVGFE* aFilterElement,
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const nsTArray<int32_t>& aInputIndices)
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{
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nsSVGFE* fE = aFilterElement;
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IntRect defaultFilterSubregion(0,0,0,0);
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if (fE->SubregionIsUnionOfRegions()) {
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for (uint32_t i = 0; i < aInputIndices.Length(); ++i) {
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int32_t inputIndex = aInputIndices[i];
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IntRect inputSubregion = inputIndex >= 0 ?
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mPrimitiveDescriptions[inputIndex].PrimitiveSubregion() :
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ToIntRect(mFilterSpaceBounds);
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defaultFilterSubregion = defaultFilterSubregion.Union(inputSubregion);
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}
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} else {
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defaultFilterSubregion = ToIntRect(mFilterSpaceBounds);
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}
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gfxRect feArea = nsSVGUtils::GetRelativeRect(mPrimitiveUnits,
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&fE->mLengthAttributes[nsSVGFE::ATTR_X], mTargetBBox, mTargetFrame);
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Rect region = ToRect(UserSpaceToFilterSpace(feArea));
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if (!fE->mLengthAttributes[nsSVGFE::ATTR_X].IsExplicitlySet())
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region.x = defaultFilterSubregion.X();
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if (!fE->mLengthAttributes[nsSVGFE::ATTR_Y].IsExplicitlySet())
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region.y = defaultFilterSubregion.Y();
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if (!fE->mLengthAttributes[nsSVGFE::ATTR_WIDTH].IsExplicitlySet())
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region.width = defaultFilterSubregion.Width();
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if (!fE->mLengthAttributes[nsSVGFE::ATTR_HEIGHT].IsExplicitlySet())
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region.height = defaultFilterSubregion.Height();
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// We currently require filter primitive subregions to be pixel-aligned.
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// Following the spec, any pixel partially in the region is included
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// in the region.
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region.RoundOut();
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return RoundedToInt(region);
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}
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void
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nsSVGFilterInstance::GetInputsAreTainted(const nsTArray<int32_t>& aInputIndices,
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nsTArray<bool>& aOutInputsAreTainted)
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{
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for (uint32_t i = 0; i < aInputIndices.Length(); i++) {
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int32_t inputIndex = aInputIndices[i];
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if (inputIndex < 0) {
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// SourceGraphic, SourceAlpha, FillPaint and StrokePaint are tainted.
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aOutInputsAreTainted.AppendElement(true);
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} else {
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aOutInputsAreTainted.AppendElement(mPrimitiveDescriptions[inputIndex].IsTainted());
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}
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}
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}
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static nsresult
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GetSourceIndices(nsSVGFE* aFilterElement,
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int32_t aCurrentIndex,
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const nsDataHashtable<nsStringHashKey, int32_t>& aImageTable,
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nsTArray<int32_t>& aSourceIndices)
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{
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nsAutoTArray<nsSVGStringInfo,2> sources;
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aFilterElement->GetSourceImageNames(sources);
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for (uint32_t j = 0; j < sources.Length(); j++) {
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nsAutoString str;
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sources[j].mString->GetAnimValue(str, sources[j].mElement);
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int32_t sourceIndex = 0;
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if (str.EqualsLiteral("SourceGraphic")) {
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sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexSourceGraphic;
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} else if (str.EqualsLiteral("SourceAlpha")) {
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sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexSourceAlpha;
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} else if (str.EqualsLiteral("FillPaint")) {
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sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexFillPaint;
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} else if (str.EqualsLiteral("StrokePaint")) {
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sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexStrokePaint;
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} else if (str.EqualsLiteral("BackgroundImage") ||
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str.EqualsLiteral("BackgroundAlpha")) {
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return NS_ERROR_NOT_IMPLEMENTED;
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} else if (str.EqualsLiteral("")) {
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sourceIndex = aCurrentIndex == 0 ?
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FilterPrimitiveDescription::kPrimitiveIndexSourceGraphic :
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aCurrentIndex - 1;
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} else {
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bool inputExists = aImageTable.Get(str, &sourceIndex);
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if (!inputExists)
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return NS_ERROR_FAILURE;
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}
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MOZ_ASSERT(sourceIndex < aCurrentIndex);
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aSourceIndices.AppendElement(sourceIndex);
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}
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return NS_OK;
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}
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nsresult
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nsSVGFilterInstance::BuildPrimitives()
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{
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nsTArray<nsRefPtr<nsSVGFE> > primitives;
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for (nsIContent* child = mFilterElement->nsINode::GetFirstChild();
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child;
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child = child->GetNextSibling()) {
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nsRefPtr<nsSVGFE> primitive;
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CallQueryInterface(child, (nsSVGFE**)getter_AddRefs(primitive));
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if (primitive) {
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primitives.AppendElement(primitive);
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}
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}
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// Maps source image name to source index.
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nsDataHashtable<nsStringHashKey, int32_t> imageTable(10);
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// The principal that we check principals of any loaded images against.
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nsCOMPtr<nsIPrincipal> principal = mTargetFrame->GetContent()->NodePrincipal();
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for (uint32_t i = 0; i < primitives.Length(); ++i) {
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nsSVGFE* filter = primitives[i];
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nsAutoTArray<int32_t,2> sourceIndices;
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nsresult rv = GetSourceIndices(filter, i, imageTable, sourceIndices);
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if (NS_FAILED(rv)) {
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return rv;
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}
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IntRect primitiveSubregion =
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ComputeFilterPrimitiveSubregion(filter, sourceIndices);
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nsTArray<bool> sourcesAreTainted;
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GetInputsAreTainted(sourceIndices, sourcesAreTainted);
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FilterPrimitiveDescription descr =
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filter->GetPrimitiveDescription(this, primitiveSubregion, sourcesAreTainted, mInputImages);
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descr.SetIsTainted(filter->OutputIsTainted(sourcesAreTainted, principal));
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descr.SetPrimitiveSubregion(primitiveSubregion);
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for (uint32_t j = 0; j < sourceIndices.Length(); j++) {
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int32_t inputIndex = sourceIndices[j];
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descr.SetInputPrimitive(j, inputIndex);
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ColorSpace inputColorSpace =
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inputIndex < 0 ? SRGB : mPrimitiveDescriptions[inputIndex].OutputColorSpace();
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ColorSpace desiredInputColorSpace = filter->GetInputColorSpace(j, inputColorSpace);
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descr.SetInputColorSpace(j, desiredInputColorSpace);
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if (j == 0) {
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// the output color space is whatever in1 is if there is an in1
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descr.SetOutputColorSpace(desiredInputColorSpace);
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}
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}
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if (sourceIndices.Length() == 0) {
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descr.SetOutputColorSpace(filter->GetOutputColorSpace());
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}
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mPrimitiveDescriptions.AppendElement(descr);
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nsAutoString str;
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filter->GetResultImageName().GetAnimValue(str, filter);
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imageTable.Put(str, i);
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}
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return NS_OK;
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}
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void
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nsSVGFilterInstance::ComputeNeededBoxes()
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{
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if (mPrimitiveDescriptions.IsEmpty())
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return;
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nsIntRegion sourceGraphicNeededRegion;
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nsIntRegion fillPaintNeededRegion;
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nsIntRegion strokePaintNeededRegion;
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FilterDescription filter(mPrimitiveDescriptions, ToIntRect(mFilterSpaceBounds));
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FilterSupport::ComputeSourceNeededRegions(
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filter, mPostFilterDirtyRect,
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sourceGraphicNeededRegion, fillPaintNeededRegion, strokePaintNeededRegion);
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nsIntRect sourceBoundsInt;
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gfxRect sourceBounds = UserSpaceToFilterSpace(mTargetBBox);
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sourceBounds.RoundOut();
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// Detect possible float->int overflow
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if (!gfxUtils::GfxRectToIntRect(sourceBounds, &sourceBoundsInt))
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return;
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sourceBoundsInt.UnionRect(sourceBoundsInt, mTargetBounds);
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sourceGraphicNeededRegion.And(sourceGraphicNeededRegion, sourceBoundsInt);
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mSourceGraphic.mNeededBounds = sourceGraphicNeededRegion.GetBounds();
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mFillPaint.mNeededBounds = fillPaintNeededRegion.GetBounds();
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mStrokePaint.mNeededBounds = strokePaintNeededRegion.GetBounds();
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}
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nsresult
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nsSVGFilterInstance::BuildSourcePaint(SourceInfo *aSource,
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gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT)
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{
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nsIntRect neededRect = aSource->mNeededBounds;
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RefPtr<DrawTarget> offscreenDT;
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nsRefPtr<gfxASurface> offscreenSurface;
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nsRefPtr<gfxContext> ctx;
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if (aTargetSurface) {
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offscreenSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
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neededRect.Size(), gfxContentType::COLOR_ALPHA);
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if (!offscreenSurface || offscreenSurface->CairoStatus()) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ctx = new gfxContext(offscreenSurface);
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} else {
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offscreenDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
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ToIntSize(neededRect.Size()), SurfaceFormat::B8G8R8A8);
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if (!offscreenDT) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ctx = new gfxContext(offscreenDT);
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}
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ctx->Translate(-neededRect.TopLeft());
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nsRenderingContext tmpCtx;
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tmpCtx.Init(mTargetFrame->PresContext()->DeviceContext(), ctx);
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gfxMatrix m = GetUserSpaceToFilterSpaceTransform();
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m.Invert();
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gfxRect r = m.TransformBounds(mFilterSpaceBounds);
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gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform().Invert();
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gfxContext *gfx = tmpCtx.ThebesContext();
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gfx->Multiply(deviceToFilterSpace);
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gfx->Save();
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gfxMatrix matrix =
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nsSVGUtils::GetCanvasTM(mTargetFrame, nsISVGChildFrame::FOR_PAINTING,
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mTransformRoot);
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if (!matrix.IsSingular()) {
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gfx->Multiply(matrix);
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gfx->Rectangle(r);
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if ((aSource == &mFillPaint &&
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nsSVGUtils::SetupCairoFillPaint(mTargetFrame, gfx)) ||
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(aSource == &mStrokePaint &&
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nsSVGUtils::SetupCairoStrokePaint(mTargetFrame, gfx))) {
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gfx->Fill();
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}
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}
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gfx->Restore();
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if (offscreenSurface) {
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aSource->mSourceSurface =
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gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTargetDT, offscreenSurface);
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} else {
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aSource->mSourceSurface = offscreenDT->Snapshot();
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}
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aSource->mSurfaceRect = ToIntRect(neededRect);
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return NS_OK;
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}
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nsresult
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nsSVGFilterInstance::BuildSourcePaints(gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT)
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{
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nsresult rv = NS_OK;
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if (!mFillPaint.mNeededBounds.IsEmpty()) {
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rv = BuildSourcePaint(&mFillPaint, aTargetSurface, aTargetDT);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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if (!mStrokePaint.mNeededBounds.IsEmpty()) {
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rv = BuildSourcePaint(&mStrokePaint, aTargetSurface, aTargetDT);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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return rv;
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}
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nsresult
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nsSVGFilterInstance::BuildSourceImage(gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT)
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{
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nsIntRect neededRect = mSourceGraphic.mNeededBounds;
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if (neededRect.IsEmpty()) {
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return NS_OK;
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}
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RefPtr<DrawTarget> offscreenDT;
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nsRefPtr<gfxASurface> offscreenSurface;
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nsRefPtr<gfxContext> ctx;
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if (aTargetSurface) {
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offscreenSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
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neededRect.Size(), gfxContentType::COLOR_ALPHA);
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if (!offscreenSurface || offscreenSurface->CairoStatus()) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ctx = new gfxContext(offscreenSurface);
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} else {
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offscreenDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
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ToIntSize(neededRect.Size()), SurfaceFormat::B8G8R8A8);
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if (!offscreenDT) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ctx = new gfxContext(offscreenDT);
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}
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ctx->Translate(-neededRect.TopLeft());
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nsRenderingContext tmpCtx;
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tmpCtx.Init(mTargetFrame->PresContext()->DeviceContext(), ctx);
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gfxMatrix m = GetUserSpaceToFilterSpaceTransform();
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m.Invert();
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gfxRect r = m.TransformBounds(neededRect);
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r.RoundOut();
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nsIntRect dirty;
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if (!gfxUtils::GfxRectToIntRect(r, &dirty))
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return NS_ERROR_FAILURE;
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// SVG graphics paint to device space, so we need to set an initial device
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// space to filter space transform on the gfxContext that SourceGraphic
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// and SourceAlpha will paint to.
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//
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// (In theory it would be better to minimize error by having filtered SVG
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// graphics temporarily paint to user space when painting the sources and
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// only set a user space to filter space transform on the gfxContext
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// (since that would eliminate the transform multiplications from user
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// space to device space and back again). However, that would make the
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// code more complex while being hard to get right without introducing
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// subtle bugs, and in practice it probably makes no real difference.)
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gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform().Invert();
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tmpCtx.ThebesContext()->Multiply(deviceToFilterSpace);
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mPaintCallback->Paint(&tmpCtx, mTargetFrame, &dirty, mTransformRoot);
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RefPtr<SourceSurface> sourceGraphicSource;
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if (offscreenSurface) {
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sourceGraphicSource =
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gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTargetDT, offscreenSurface);
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} else {
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sourceGraphicSource = offscreenDT->Snapshot();
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}
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mSourceGraphic.mSourceSurface = sourceGraphicSource;
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mSourceGraphic.mSurfaceRect = ToIntRect(neededRect);
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return NS_OK;
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}
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nsresult
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nsSVGFilterInstance::Render(gfxContext* aContext)
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{
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nsresult rv = BuildPrimitives();
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if (NS_FAILED(rv))
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return rv;
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if (mPrimitiveDescriptions.IsEmpty()) {
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// Nothing should be rendered.
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return NS_OK;
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}
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nsIntRect filterRect = mPostFilterDirtyRect.Intersect(mFilterSpaceBounds);
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gfxMatrix ctm = GetFilterSpaceToDeviceSpaceTransform();
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if (filterRect.IsEmpty() || ctm.IsSingular()) {
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return NS_OK;
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}
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Matrix oldDTMatrix;
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nsRefPtr<gfxASurface> resultImage;
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RefPtr<DrawTarget> dt;
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if (aContext->IsCairo()) {
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resultImage =
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gfxPlatform::GetPlatform()->CreateOffscreenSurface(filterRect.Size(),
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gfxContentType::COLOR_ALPHA);
|
|
if (!resultImage || resultImage->CairoStatus())
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
// Create a Cairo DrawTarget around resultImage.
|
|
dt = gfxPlatform::GetPlatform()->CreateDrawTargetForSurface(
|
|
resultImage, ToIntSize(filterRect.Size()));
|
|
} else {
|
|
// When we have a DrawTarget-backed context, we can call DrawFilter
|
|
// directly on the target DrawTarget and don't need a temporary DT.
|
|
dt = aContext->GetDrawTarget();
|
|
oldDTMatrix = dt->GetTransform();
|
|
Matrix matrix = ToMatrix(ctm);
|
|
matrix.Translate(filterRect.x, filterRect.y);
|
|
dt->SetTransform(matrix * oldDTMatrix);
|
|
}
|
|
|
|
ComputeNeededBoxes();
|
|
|
|
rv = BuildSourceImage(resultImage, dt);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
rv = BuildSourcePaints(resultImage, dt);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
|
|
FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
|
|
|
|
FilterSupport::RenderFilterDescription(
|
|
dt, filter, ToRect(filterRect),
|
|
mSourceGraphic.mSourceSurface, mSourceGraphic.mSurfaceRect,
|
|
mFillPaint.mSourceSurface, mFillPaint.mSurfaceRect,
|
|
mStrokePaint.mSourceSurface, mStrokePaint.mSurfaceRect,
|
|
mInputImages);
|
|
|
|
if (resultImage) {
|
|
aContext->Save();
|
|
aContext->Multiply(ctm);
|
|
aContext->Translate(filterRect.TopLeft());
|
|
aContext->SetSource(resultImage);
|
|
aContext->Paint();
|
|
aContext->Restore();
|
|
} else {
|
|
dt->SetTransform(oldDTMatrix);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsSVGFilterInstance::ComputePostFilterDirtyRect(nsIntRect* aPostFilterDirtyRect)
|
|
{
|
|
*aPostFilterDirtyRect = nsIntRect();
|
|
if (mPreFilterDirtyRect.IsEmpty()) {
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult rv = BuildPrimitives();
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
if (mPrimitiveDescriptions.IsEmpty()) {
|
|
// Nothing should be rendered, so nothing can be dirty.
|
|
return NS_OK;
|
|
}
|
|
|
|
IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
|
|
FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
|
|
nsIntRegion resultChangeRegion =
|
|
FilterSupport::ComputeResultChangeRegion(filter,
|
|
mPreFilterDirtyRect, nsIntRegion(), nsIntRegion());
|
|
*aPostFilterDirtyRect = resultChangeRegion.GetBounds();
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsSVGFilterInstance::ComputePostFilterExtents(nsIntRect* aPostFilterExtents)
|
|
{
|
|
*aPostFilterExtents = nsIntRect();
|
|
|
|
nsresult rv = BuildPrimitives();
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
if (mPrimitiveDescriptions.IsEmpty()) {
|
|
return NS_OK;
|
|
}
|
|
|
|
nsIntRect sourceBoundsInt;
|
|
gfxRect sourceBounds = UserSpaceToFilterSpace(mTargetBBox);
|
|
sourceBounds.RoundOut();
|
|
// Detect possible float->int overflow
|
|
if (!gfxUtils::GfxRectToIntRect(sourceBounds, &sourceBoundsInt))
|
|
return NS_ERROR_FAILURE;
|
|
sourceBoundsInt.UnionRect(sourceBoundsInt, mTargetBounds);
|
|
|
|
IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
|
|
FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
|
|
nsIntRegion postFilterExtents =
|
|
FilterSupport::ComputePostFilterExtents(filter, sourceBoundsInt);
|
|
*aPostFilterExtents = postFilterExtents.GetBounds();
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsSVGFilterInstance::ComputeSourceNeededRect(nsIntRect* aDirty)
|
|
{
|
|
nsresult rv = BuildPrimitives();
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
if (mPrimitiveDescriptions.IsEmpty()) {
|
|
// Nothing should be rendered, so nothing is needed.
|
|
return NS_OK;
|
|
}
|
|
|
|
ComputeNeededBoxes();
|
|
*aDirty = mSourceGraphic.mNeededBounds;
|
|
|
|
return NS_OK;
|
|
}
|