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gecko/layout/svg/nsSVGFilterInstance.cpp

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/* -*- 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 "nsSVGFilterInstance.h"
// Keep others in (case-insensitive) order:
#include "gfxPlatform.h"
#include "gfxUtils.h"
#include "nsISVGChildFrame.h"
#include "nsRenderingContext.h"
#include "mozilla/dom/SVGFilterElement.h"
#include "nsSVGFilterFrame.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;
nsSVGFilterInstance::nsSVGFilterInstance(nsIFrame *aTargetFrame,
nsSVGFilterFrame *aFilterFrame,
nsSVGFilterPaintCallback *aPaintCallback,
const nsRect *aPostFilterDirtyRect,
const nsRect *aPreFilterDirtyRect,
const nsRect *aPreFilterVisualOverflowRectOverride,
const gfxRect *aOverrideBBox,
nsIFrame* aTransformRoot) :
mTargetFrame(aTargetFrame),
mPaintCallback(aPaintCallback),
mTransformRoot(aTransformRoot),
mInitialized(false) {
mFilterElement = aFilterFrame->GetFilterContent();
mPrimitiveUnits =
aFilterFrame->GetEnumValue(SVGFilterElement::PRIMITIVEUNITS);
mTargetBBox = aOverrideBBox ?
*aOverrideBBox : nsSVGUtils::GetBBox(mTargetFrame);
// Get the filter region (in the filtered element's user space):
// XXX if filterUnits is set (or has defaulted) to objectBoundingBox, we
// should send a warning to the error console if the author has used lengths
// with units. This is a common mistake and can result in filterRes being
// *massive* below (because we ignore the units and interpret the number as
// a factor of the bbox width/height). We should also send a warning if the
// user uses a number without units (a future SVG spec should really
// deprecate that, since it's too confusing for a bare number to be sometimes
// interpreted as a fraction of the bounding box and sometimes as user-space
// units). So really only percentage values should be used in this case.
nsSVGLength2 XYWH[4];
NS_ABORT_IF_FALSE(sizeof(mFilterElement->mLengthAttributes) == sizeof(XYWH),
"XYWH size incorrect");
memcpy(XYWH, mFilterElement->mLengthAttributes,
sizeof(mFilterElement->mLengthAttributes));
XYWH[0] = *aFilterFrame->GetLengthValue(SVGFilterElement::ATTR_X);
XYWH[1] = *aFilterFrame->GetLengthValue(SVGFilterElement::ATTR_Y);
XYWH[2] = *aFilterFrame->GetLengthValue(SVGFilterElement::ATTR_WIDTH);
XYWH[3] = *aFilterFrame->GetLengthValue(SVGFilterElement::ATTR_HEIGHT);
uint16_t filterUnits =
aFilterFrame->GetEnumValue(SVGFilterElement::FILTERUNITS);
// The filter region in user space, in user units:
mFilterRegion = nsSVGUtils::GetRelativeRect(filterUnits,
XYWH, mTargetBBox, mTargetFrame);
if (mFilterRegion.Width() <= 0 || mFilterRegion.Height() <= 0) {
// 0 disables rendering, < 0 is error. dispatch error console warning
// or error as appropriate.
return;
}
// Calculate filterRes (the width and height of the pixel buffer of the
// temporary offscreen surface that we would/will create to paint into when
// painting the entire filtered element) and, if necessary, adjust
// mFilterRegion out slightly so that it aligns with pixel boundaries of this
// buffer:
gfxIntSize filterRes;
const nsSVGIntegerPair* filterResAttrs =
aFilterFrame->GetIntegerPairValue(SVGFilterElement::FILTERRES);
if (filterResAttrs->IsExplicitlySet()) {
int32_t filterResX = filterResAttrs->GetAnimValue(nsSVGIntegerPair::eFirst);
int32_t filterResY = filterResAttrs->GetAnimValue(nsSVGIntegerPair::eSecond);
if (filterResX <= 0 || filterResY <= 0) {
// 0 disables rendering, < 0 is error. dispatch error console warning?
return;
}
mFilterRegion.Scale(filterResX, filterResY);
mFilterRegion.RoundOut();
mFilterRegion.Scale(1.0 / filterResX, 1.0 / filterResY);
// We don't care if this overflows, because we can handle upscaling/
// downscaling to filterRes
bool overflow;
filterRes =
nsSVGUtils::ConvertToSurfaceSize(gfxSize(filterResX, filterResY),
&overflow);
// XXX we could send a warning to the error console if the author specified
// filterRes doesn't align well with our outer 'svg' device space.
} else {
// Match filterRes as closely as possible to the pixel density of the nearest
// outer 'svg' device space:
gfxMatrix canvasTM =
nsSVGUtils::GetCanvasTM(mTargetFrame, nsISVGChildFrame::FOR_OUTERSVG_TM);
if (canvasTM.IsSingular()) {
// nothing to draw
return;
}
gfxSize scale = canvasTM.ScaleFactors(true);
mFilterRegion.Scale(scale.width, scale.height);
mFilterRegion.RoundOut();
// We don't care if this overflows, because we can handle upscaling/
// downscaling to filterRes
bool overflow;
filterRes = nsSVGUtils::ConvertToSurfaceSize(mFilterRegion.Size(),
&overflow);
mFilterRegion.Scale(1.0 / scale.width, 1.0 / scale.height);
}
mFilterSpaceBounds.SetRect(nsIntPoint(0, 0), filterRes);
// Get various transforms:
gfxMatrix filterToUserSpace(mFilterRegion.Width() / filterRes.width, 0.0f,
0.0f, mFilterRegion.Height() / filterRes.height,
mFilterRegion.X(), mFilterRegion.Y());
// Only used (so only set) when we paint:
if (mPaintCallback) {
mFilterSpaceToDeviceSpaceTransform = filterToUserSpace *
nsSVGUtils::GetCanvasTM(mTargetFrame, nsISVGChildFrame::FOR_PAINTING);
}
// Convert the passed in rects from frame to filter space:
mAppUnitsPerCSSPx = mTargetFrame->PresContext()->AppUnitsPerCSSPixel();
mFilterSpaceToFrameSpaceInCSSPxTransform =
filterToUserSpace * GetUserSpaceToFrameSpaceInCSSPxTransform();
// mFilterSpaceToFrameSpaceInCSSPxTransform is always invertible
mFrameSpaceInCSSPxToFilterSpaceTransform =
mFilterSpaceToFrameSpaceInCSSPxTransform;
mFrameSpaceInCSSPxToFilterSpaceTransform.Invert();
mPostFilterDirtyRect = FrameSpaceToFilterSpace(aPostFilterDirtyRect);
mPreFilterDirtyRect = FrameSpaceToFilterSpace(aPreFilterDirtyRect);
if (aPreFilterVisualOverflowRectOverride) {
mTargetBounds =
FrameSpaceToFilterSpace(aPreFilterVisualOverflowRectOverride);
} else {
nsRect preFilterVOR = mTargetFrame->GetPreEffectsVisualOverflowRect();
mTargetBounds = FrameSpaceToFilterSpace(&preFilterVOR);
}
mInitialized = true;
}
float
nsSVGFilterInstance::GetPrimitiveNumber(uint8_t aCtxType, float aValue) const
{
nsSVGLength2 val;
val.Init(aCtxType, 0xff, aValue,
nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
float value;
if (mPrimitiveUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
value = nsSVGUtils::ObjectSpace(mTargetBBox, &val);
} else {
value = nsSVGUtils::UserSpace(mTargetFrame, &val);
}
switch (aCtxType) {
case SVGContentUtils::X:
return value * mFilterSpaceBounds.width / mFilterRegion.Width();
case SVGContentUtils::Y:
return value * mFilterSpaceBounds.height / mFilterRegion.Height();
case SVGContentUtils::XY:
default:
return value * SVGContentUtils::ComputeNormalizedHypotenuse(
mFilterSpaceBounds.width / mFilterRegion.Width(),
mFilterSpaceBounds.height / mFilterRegion.Height());
}
}
Point3D
nsSVGFilterInstance::ConvertLocation(const Point3D& aPoint) const
{
nsSVGLength2 val[4];
val[0].Init(SVGContentUtils::X, 0xff, aPoint.x,
nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
val[1].Init(SVGContentUtils::Y, 0xff, aPoint.y,
nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
// Dummy width/height values
val[2].Init(SVGContentUtils::X, 0xff, 0,
nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
val[3].Init(SVGContentUtils::Y, 0xff, 0,
nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
gfxRect feArea = nsSVGUtils::GetRelativeRect(mPrimitiveUnits,
val, mTargetBBox, mTargetFrame);
gfxRect r = UserSpaceToFilterSpace(feArea);
return Point3D(r.x, r.y, GetPrimitiveNumber(SVGContentUtils::XY, aPoint.z));
}
gfxRect
nsSVGFilterInstance::UserSpaceToFilterSpace(const gfxRect& aRect) const
{
gfxRect r = aRect - mFilterRegion.TopLeft();
r.Scale(mFilterSpaceBounds.width / mFilterRegion.Width(),
mFilterSpaceBounds.height / mFilterRegion.Height());
return r;
}
gfxPoint
nsSVGFilterInstance::FilterSpaceToUserSpace(const gfxPoint& aPt) const
{
return gfxPoint(aPt.x * mFilterRegion.Width() / mFilterSpaceBounds.width + mFilterRegion.X(),
aPt.y * mFilterRegion.Height() / mFilterSpaceBounds.height + mFilterRegion.Y());
}
gfxMatrix
nsSVGFilterInstance::GetUserSpaceToFilterSpaceTransform() const
{
gfxFloat widthScale = mFilterSpaceBounds.width / mFilterRegion.Width();
gfxFloat heightScale = mFilterSpaceBounds.height / mFilterRegion.Height();
return gfxMatrix(widthScale, 0.0f,
0.0f, heightScale,
-mFilterRegion.X() * widthScale, -mFilterRegion.Y() * heightScale);
}
IntRect
nsSVGFilterInstance::ComputeFilterPrimitiveSubregion(nsSVGFE* aFilterElement,
const nsTArray<int32_t>& aInputIndices)
{
nsSVGFE* fE = aFilterElement;
IntRect defaultFilterSubregion(0,0,0,0);
if (fE->SubregionIsUnionOfRegions()) {
for (uint32_t i = 0; i < aInputIndices.Length(); ++i) {
int32_t inputIndex = aInputIndices[i];
IntRect inputSubregion = inputIndex >= 0 ?
mPrimitiveDescriptions[inputIndex].PrimitiveSubregion() :
ToIntRect(mFilterSpaceBounds);
defaultFilterSubregion = defaultFilterSubregion.Union(inputSubregion);
}
} else {
defaultFilterSubregion = ToIntRect(mFilterSpaceBounds);
}
gfxRect feArea = nsSVGUtils::GetRelativeRect(mPrimitiveUnits,
&fE->mLengthAttributes[nsSVGFE::ATTR_X], mTargetBBox, mTargetFrame);
Rect region = ToRect(UserSpaceToFilterSpace(feArea));
if (!fE->mLengthAttributes[nsSVGFE::ATTR_X].IsExplicitlySet())
region.x = defaultFilterSubregion.X();
if (!fE->mLengthAttributes[nsSVGFE::ATTR_Y].IsExplicitlySet())
region.y = defaultFilterSubregion.Y();
if (!fE->mLengthAttributes[nsSVGFE::ATTR_WIDTH].IsExplicitlySet())
region.width = defaultFilterSubregion.Width();
if (!fE->mLengthAttributes[nsSVGFE::ATTR_HEIGHT].IsExplicitlySet())
region.height = defaultFilterSubregion.Height();
// We currently require filter primitive subregions to be pixel-aligned.
// Following the spec, any pixel partially in the region is included
// in the region.
region.RoundOut();
return RoundedToInt(region);
}
void
nsSVGFilterInstance::GetInputsAreTainted(const nsTArray<int32_t>& aInputIndices,
nsTArray<bool>& aOutInputsAreTainted)
{
for (uint32_t i = 0; i < aInputIndices.Length(); i++) {
int32_t inputIndex = aInputIndices[i];
if (inputIndex < 0) {
// SourceGraphic, SourceAlpha, FillPaint and StrokePaint are tainted.
aOutInputsAreTainted.AppendElement(true);
} else {
aOutInputsAreTainted.AppendElement(mPrimitiveDescriptions[inputIndex].IsTainted());
}
}
}
static nsresult
GetSourceIndices(nsSVGFE* aFilterElement,
int32_t aCurrentIndex,
const nsDataHashtable<nsStringHashKey, int32_t>& aImageTable,
nsTArray<int32_t>& aSourceIndices)
{
nsAutoTArray<nsSVGStringInfo,2> sources;
aFilterElement->GetSourceImageNames(sources);
for (uint32_t j = 0; j < sources.Length(); j++) {
nsAutoString str;
sources[j].mString->GetAnimValue(str, sources[j].mElement);
int32_t sourceIndex = 0;
if (str.EqualsLiteral("SourceGraphic")) {
sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexSourceGraphic;
} else if (str.EqualsLiteral("SourceAlpha")) {
sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexSourceAlpha;
} else if (str.EqualsLiteral("FillPaint")) {
sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexFillPaint;
} else if (str.EqualsLiteral("StrokePaint")) {
sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexStrokePaint;
} else if (str.EqualsLiteral("BackgroundImage") ||
str.EqualsLiteral("BackgroundAlpha")) {
return NS_ERROR_NOT_IMPLEMENTED;
} else if (str.EqualsLiteral("")) {
sourceIndex = aCurrentIndex == 0 ?
FilterPrimitiveDescription::kPrimitiveIndexSourceGraphic :
aCurrentIndex - 1;
} else {
bool inputExists = aImageTable.Get(str, &sourceIndex);
if (!inputExists)
return NS_ERROR_FAILURE;
}
MOZ_ASSERT(sourceIndex < aCurrentIndex);
aSourceIndices.AppendElement(sourceIndex);
}
return NS_OK;
}
nsresult
nsSVGFilterInstance::BuildPrimitives()
{
nsTArray<nsRefPtr<nsSVGFE> > primitives;
for (nsIContent* child = mFilterElement->nsINode::GetFirstChild();
child;
child = child->GetNextSibling()) {
nsRefPtr<nsSVGFE> primitive;
CallQueryInterface(child, (nsSVGFE**)getter_AddRefs(primitive));
if (primitive) {
primitives.AppendElement(primitive);
}
}
// Maps source image name to source index.
nsDataHashtable<nsStringHashKey, int32_t> imageTable(10);
// The principal that we check principals of any loaded images against.
nsCOMPtr<nsIPrincipal> principal = mTargetFrame->GetContent()->NodePrincipal();
for (uint32_t i = 0; i < primitives.Length(); ++i) {
nsSVGFE* filter = primitives[i];
nsAutoTArray<int32_t,2> sourceIndices;
nsresult rv = GetSourceIndices(filter, i, imageTable, sourceIndices);
if (NS_FAILED(rv)) {
return rv;
}
IntRect primitiveSubregion =
ComputeFilterPrimitiveSubregion(filter, sourceIndices);
nsTArray<bool> sourcesAreTainted;
GetInputsAreTainted(sourceIndices, sourcesAreTainted);
FilterPrimitiveDescription descr =
filter->GetPrimitiveDescription(this, primitiveSubregion, sourcesAreTainted, mInputImages);
descr.SetIsTainted(filter->OutputIsTainted(sourcesAreTainted, principal));
descr.SetPrimitiveSubregion(primitiveSubregion);
for (uint32_t j = 0; j < sourceIndices.Length(); j++) {
int32_t inputIndex = sourceIndices[j];
descr.SetInputPrimitive(j, inputIndex);
ColorSpace inputColorSpace =
inputIndex < 0 ? SRGB : mPrimitiveDescriptions[inputIndex].OutputColorSpace();
ColorSpace desiredInputColorSpace = filter->GetInputColorSpace(j, inputColorSpace);
descr.SetInputColorSpace(j, desiredInputColorSpace);
if (j == 0) {
// the output color space is whatever in1 is if there is an in1
descr.SetOutputColorSpace(desiredInputColorSpace);
}
}
if (sourceIndices.Length() == 0) {
descr.SetOutputColorSpace(filter->GetOutputColorSpace());
}
mPrimitiveDescriptions.AppendElement(descr);
nsAutoString str;
filter->GetResultImageName().GetAnimValue(str, filter);
imageTable.Put(str, i);
}
return NS_OK;
}
void
nsSVGFilterInstance::ComputeNeededBoxes()
{
if (mPrimitiveDescriptions.IsEmpty())
return;
nsIntRegion sourceGraphicNeededRegion;
nsIntRegion fillPaintNeededRegion;
nsIntRegion strokePaintNeededRegion;
FilterDescription filter(mPrimitiveDescriptions, ToIntRect(mFilterSpaceBounds));
FilterSupport::ComputeSourceNeededRegions(
filter, mPostFilterDirtyRect,
sourceGraphicNeededRegion, fillPaintNeededRegion, strokePaintNeededRegion);
nsIntRect sourceBoundsInt;
gfxRect sourceBounds = UserSpaceToFilterSpace(mTargetBBox);
sourceBounds.RoundOut();
// Detect possible float->int overflow
if (!gfxUtils::GfxRectToIntRect(sourceBounds, &sourceBoundsInt))
return;
sourceBoundsInt.UnionRect(sourceBoundsInt, mTargetBounds);
sourceGraphicNeededRegion.And(sourceGraphicNeededRegion, sourceBoundsInt);
mSourceGraphic.mNeededBounds = sourceGraphicNeededRegion.GetBounds();
mFillPaint.mNeededBounds = fillPaintNeededRegion.GetBounds();
mStrokePaint.mNeededBounds = strokePaintNeededRegion.GetBounds();
}
nsresult
nsSVGFilterInstance::BuildSourcePaint(SourceInfo *aSource,
gfxASurface* aTargetSurface,
DrawTarget* aTargetDT)
{
nsIntRect neededRect = aSource->mNeededBounds;
RefPtr<DrawTarget> offscreenDT;
nsRefPtr<gfxASurface> offscreenSurface;
nsRefPtr<gfxContext> ctx;
if (aTargetSurface) {
offscreenSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
neededRect.Size(), gfxContentType::COLOR_ALPHA);
if (!offscreenSurface || offscreenSurface->CairoStatus()) {
return NS_ERROR_OUT_OF_MEMORY;
}
ctx = new gfxContext(offscreenSurface);
} else {
offscreenDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
ToIntSize(neededRect.Size()), SurfaceFormat::B8G8R8A8);
if (!offscreenDT) {
return NS_ERROR_OUT_OF_MEMORY;
}
ctx = new gfxContext(offscreenDT);
}
ctx->Translate(-neededRect.TopLeft());
nsRenderingContext tmpCtx;
tmpCtx.Init(mTargetFrame->PresContext()->DeviceContext(), ctx);
gfxMatrix m = GetUserSpaceToFilterSpaceTransform();
m.Invert();
gfxRect r = m.TransformBounds(mFilterSpaceBounds);
gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform().Invert();
gfxContext *gfx = tmpCtx.ThebesContext();
gfx->Multiply(deviceToFilterSpace);
gfx->Save();
gfxMatrix matrix =
nsSVGUtils::GetCanvasTM(mTargetFrame, nsISVGChildFrame::FOR_PAINTING,
mTransformRoot);
if (!matrix.IsSingular()) {
gfx->Multiply(matrix);
gfx->Rectangle(r);
if ((aSource == &mFillPaint &&
nsSVGUtils::SetupCairoFillPaint(mTargetFrame, gfx)) ||
(aSource == &mStrokePaint &&
nsSVGUtils::SetupCairoStrokePaint(mTargetFrame, gfx))) {
gfx->Fill();
}
}
gfx->Restore();
if (offscreenSurface) {
aSource->mSourceSurface =
gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTargetDT, offscreenSurface);
} else {
aSource->mSourceSurface = offscreenDT->Snapshot();
}
aSource->mSurfaceRect = ToIntRect(neededRect);
return NS_OK;
}
nsresult
nsSVGFilterInstance::BuildSourcePaints(gfxASurface* aTargetSurface,
DrawTarget* aTargetDT)
{
nsresult rv = NS_OK;
if (!mFillPaint.mNeededBounds.IsEmpty()) {
rv = BuildSourcePaint(&mFillPaint, aTargetSurface, aTargetDT);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!mStrokePaint.mNeededBounds.IsEmpty()) {
rv = BuildSourcePaint(&mStrokePaint, aTargetSurface, aTargetDT);
NS_ENSURE_SUCCESS(rv, rv);
}
return rv;
}
nsresult
nsSVGFilterInstance::BuildSourceImage(gfxASurface* aTargetSurface,
DrawTarget* aTargetDT)
{
nsIntRect neededRect = mSourceGraphic.mNeededBounds;
if (neededRect.IsEmpty()) {
return NS_OK;
}
RefPtr<DrawTarget> offscreenDT;
nsRefPtr<gfxASurface> offscreenSurface;
nsRefPtr<gfxContext> ctx;
if (aTargetSurface) {
offscreenSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
neededRect.Size(), gfxContentType::COLOR_ALPHA);
if (!offscreenSurface || offscreenSurface->CairoStatus()) {
return NS_ERROR_OUT_OF_MEMORY;
}
ctx = new gfxContext(offscreenSurface);
} else {
offscreenDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
ToIntSize(neededRect.Size()), SurfaceFormat::B8G8R8A8);
if (!offscreenDT) {
return NS_ERROR_OUT_OF_MEMORY;
}
ctx = new gfxContext(offscreenDT);
}
ctx->Translate(-neededRect.TopLeft());
nsRenderingContext tmpCtx;
tmpCtx.Init(mTargetFrame->PresContext()->DeviceContext(), ctx);
gfxMatrix m = GetUserSpaceToFilterSpaceTransform();
m.Invert();
gfxRect r = m.TransformBounds(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().Invert();
tmpCtx.ThebesContext()->Multiply(deviceToFilterSpace);
mPaintCallback->Paint(&tmpCtx, mTargetFrame, &dirty, mTransformRoot);
RefPtr<SourceSurface> sourceGraphicSource;
if (offscreenSurface) {
sourceGraphicSource =
gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTargetDT, offscreenSurface);
} else {
sourceGraphicSource = offscreenDT->Snapshot();
}
mSourceGraphic.mSourceSurface = sourceGraphicSource;
mSourceGraphic.mSurfaceRect = ToIntRect(neededRect);
return NS_OK;
}
nsresult
nsSVGFilterInstance::Render(gfxContext* aContext)
{
nsresult rv = BuildPrimitives();
if (NS_FAILED(rv))
return rv;
if (mPrimitiveDescriptions.IsEmpty()) {
// Nothing should be rendered.
return NS_OK;
}
nsIntRect filterRect = mPostFilterDirtyRect.Intersect(mFilterSpaceBounds);
gfxMatrix ctm = GetFilterSpaceToDeviceSpaceTransform();
if (filterRect.IsEmpty() || ctm.IsSingular()) {
return NS_OK;
}
Matrix oldDTMatrix;
nsRefPtr<gfxASurface> resultImage;
RefPtr<DrawTarget> dt;
if (aContext->IsCairo()) {
resultImage =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(filterRect.Size(),
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;
}
nsIntRect
nsSVGFilterInstance::FrameSpaceToFilterSpace(const nsRect* aRect) const
{
nsIntRect rect = mFilterSpaceBounds;
if (aRect) {
if (aRect->IsEmpty()) {
return nsIntRect();
}
gfxRect rectInCSSPx =
nsLayoutUtils::RectToGfxRect(*aRect, mAppUnitsPerCSSPx);
gfxRect rectInFilterSpace =
mFrameSpaceInCSSPxToFilterSpaceTransform.TransformBounds(rectInCSSPx);
rectInFilterSpace.RoundOut();
nsIntRect intRect;
if (gfxUtils::GfxRectToIntRect(rectInFilterSpace, &intRect)) {
rect = intRect;
}
}
return rect;
}
gfxMatrix
nsSVGFilterInstance::GetUserSpaceToFrameSpaceInCSSPxTransform() const
{
gfxMatrix userToFrameSpaceInCSSPx;
if ((mTargetFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
// As currently implemented by Mozilla for the purposes of filters, user
// space is the coordinate system established by GetCanvasTM(), since
// that's what we use to set filterToDeviceSpace above. In other words,
// for SVG, user space is actually the coordinate system aTarget
// establishes for _its_ children (i.e. after taking account of any x/y
// and viewBox attributes), not the coordinate system that is established
// for it by its 'transform' attribute (or by its _parent_) as it's
// normally defined. (XXX We should think about fixing this.) The only
// frame type for which these extra transforms are not simply an x/y
// translation is nsSVGInnerSVGFrame, hence we treat it specially here.
if (mTargetFrame->GetType() == nsGkAtoms::svgInnerSVGFrame) {
userToFrameSpaceInCSSPx =
static_cast<nsSVGElement*>(mTargetFrame->GetContent())->
PrependLocalTransformsTo(gfxMatrix());
} else {
gfxPoint targetsUserSpaceOffset =
nsLayoutUtils::RectToGfxRect(mTargetFrame->GetRect(),
mAppUnitsPerCSSPx).TopLeft();
userToFrameSpaceInCSSPx.Translate(-targetsUserSpaceOffset);
}
}
// else, for all other frames, leave as the identity matrix
return userToFrameSpaceInCSSPx;
}
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