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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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
// Main header first:
#include "SVGFilterInstance.h"
// Keep others in (case-insensitive) order:
#include "gfxPlatform.h"
#include "gfxUtils.h"
#include "mozilla/ISVGDisplayableFrame.h"
#include "mozilla/SVGContentUtils.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "mozilla/dom/SVGLengthBinding.h"
#include "mozilla/dom/SVGUnitTypesBinding.h"
#include "mozilla/dom/SVGFilterElement.h"
#include "SVGFilterFrame.h"
#include "FilterSupport.h"
#include "gfx2DGlue.h"
using namespace mozilla::dom;
using namespace mozilla::dom::SVGUnitTypes_Binding;
using namespace mozilla::gfx;
namespace mozilla {
SVGFilterInstance::SVGFilterInstance(
const StyleFilter& aFilter, SVGFilterFrame* aFilterFrame,
nsIContent* aTargetContent, const UserSpaceMetrics& aMetrics,
const gfxRect& aTargetBBox,
const MatrixScalesDouble& aUserSpaceToFilterSpaceScale)
: mFilter(aFilter),
mTargetContent(aTargetContent),
mMetrics(aMetrics),
mFilterFrame(aFilterFrame),
mTargetBBox(aTargetBBox),
mUserSpaceToFilterSpaceScale(aUserSpaceToFilterSpaceScale),
mSourceAlphaAvailable(false),
mInitialized(false) {
// Get the filter element.
mFilterElement = mFilterFrame->GetFilterContent();
if (!mFilterElement) {
MOZ_ASSERT_UNREACHABLE("filter frame should have a related element");
return;
}
mPrimitiveUnits =
mFilterFrame->GetEnumValue(SVGFilterElement::PRIMITIVEUNITS);
if (!ComputeBounds()) {
return;
}
mInitialized = true;
}
bool SVGFilterInstance::ComputeBounds() {
// 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 the filter region
// 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.
// Set the user space bounds (i.e. the filter region in user space).
SVGAnimatedLength XYWH[4];
static_assert(sizeof(mFilterElement->mLengthAttributes) == sizeof(XYWH),
"XYWH size incorrect");
memcpy(XYWH, mFilterElement->mLengthAttributes,
sizeof(mFilterElement->mLengthAttributes));
XYWH[0] = *mFilterFrame->GetLengthValue(SVGFilterElement::ATTR_X);
XYWH[1] = *mFilterFrame->GetLengthValue(SVGFilterElement::ATTR_Y);
XYWH[2] = *mFilterFrame->GetLengthValue(SVGFilterElement::ATTR_WIDTH);
XYWH[3] = *mFilterFrame->GetLengthValue(SVGFilterElement::ATTR_HEIGHT);
uint16_t filterUnits =
mFilterFrame->GetEnumValue(SVGFilterElement::FILTERUNITS);
gfxRect userSpaceBounds =
SVGUtils::GetRelativeRect(filterUnits, XYWH, mTargetBBox, mMetrics);
// Transform the user space bounds to filter space, so we
// can align them with the pixel boundaries of the offscreen surface.
// The offscreen surface has the same scale as filter space.
gfxRect filterSpaceBounds = UserSpaceToFilterSpace(userSpaceBounds);
filterSpaceBounds.RoundOut();
if (filterSpaceBounds.width <= 0 || filterSpaceBounds.height <= 0) {
// 0 disables rendering, < 0 is error. dispatch error console warning
// or error as appropriate.
return false;
}
// Set the filter space bounds.
if (!gfxUtils::GfxRectToIntRect(filterSpaceBounds, &mFilterSpaceBounds)) {
// The filter region is way too big if there is float -> int overflow.
return false;
}
return true;
}
float SVGFilterInstance::GetPrimitiveNumber(uint8_t aCtxType,
float aValue) const {
SVGAnimatedLength val;
val.Init(aCtxType, 0xff, aValue, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER);
float value;
if (mPrimitiveUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
value = SVGUtils::ObjectSpace(mTargetBBox, &val);
} else {
value = SVGUtils::UserSpace(mMetrics, &val);
}
switch (aCtxType) {
case SVGContentUtils::X:
return value * static_cast<float>(mUserSpaceToFilterSpaceScale.xScale);
case SVGContentUtils::Y:
return value * static_cast<float>(mUserSpaceToFilterSpaceScale.yScale);
case SVGContentUtils::XY:
default:
return value * SVGContentUtils::ComputeNormalizedHypotenuse(
mUserSpaceToFilterSpaceScale.xScale,
mUserSpaceToFilterSpaceScale.yScale);
}
}
Point3D SVGFilterInstance::ConvertLocation(const Point3D& aPoint) const {
SVGAnimatedLength val[4];
val[0].Init(SVGContentUtils::X, 0xff, aPoint.x,
SVGLength_Binding::SVG_LENGTHTYPE_NUMBER);
val[1].Init(SVGContentUtils::Y, 0xff, aPoint.y,
SVGLength_Binding::SVG_LENGTHTYPE_NUMBER);
// Dummy width/height values
val[2].Init(SVGContentUtils::X, 0xff, 0,
SVGLength_Binding::SVG_LENGTHTYPE_NUMBER);
val[3].Init(SVGContentUtils::Y, 0xff, 0,
SVGLength_Binding::SVG_LENGTHTYPE_NUMBER);
gfxRect feArea =
SVGUtils::GetRelativeRect(mPrimitiveUnits, val, mTargetBBox, mMetrics);
gfxRect r = UserSpaceToFilterSpace(feArea);
return Point3D(r.x, r.y, GetPrimitiveNumber(SVGContentUtils::XY, aPoint.z));
}
gfxRect SVGFilterInstance::UserSpaceToFilterSpace(
const gfxRect& aUserSpaceRect) const {
gfxRect filterSpaceRect = aUserSpaceRect;
filterSpaceRect.Scale(mUserSpaceToFilterSpaceScale);
return filterSpaceRect;
}
IntRect SVGFilterInstance::ComputeFilterPrimitiveSubregion(
SVGFilterPrimitiveElement* aFilterElement,
const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
const nsTArray<int32_t>& aInputIndices) {
SVGFilterPrimitiveElement* fE = aFilterElement;
IntRect defaultFilterSubregion(0, 0, 0, 0);
if (fE->SubregionIsUnionOfRegions()) {
for (const auto& inputIndex : aInputIndices) {
bool isStandardInput =
inputIndex < 0 || inputIndex == mSourceGraphicIndex;
IntRect inputSubregion =
isStandardInput ? mFilterSpaceBounds
: aPrimitiveDescrs[inputIndex].PrimitiveSubregion();
defaultFilterSubregion = defaultFilterSubregion.Union(inputSubregion);
}
} else {
defaultFilterSubregion = mFilterSpaceBounds;
}
gfxRect feArea = SVGUtils::GetRelativeRect(
mPrimitiveUnits,
&fE->mLengthAttributes[SVGFilterPrimitiveElement::ATTR_X], mTargetBBox,
mMetrics);
Rect region = ToRect(UserSpaceToFilterSpace(feArea));
if (!fE->mLengthAttributes[SVGFilterPrimitiveElement::ATTR_X]
.IsExplicitlySet())
region.x = defaultFilterSubregion.X();
if (!fE->mLengthAttributes[SVGFilterPrimitiveElement::ATTR_Y]
.IsExplicitlySet())
region.y = defaultFilterSubregion.Y();
if (!fE->mLengthAttributes[SVGFilterPrimitiveElement::ATTR_WIDTH]
.IsExplicitlySet())
region.width = defaultFilterSubregion.Width();
if (!fE->mLengthAttributes[SVGFilterPrimitiveElement::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 SVGFilterInstance::GetInputsAreTainted(
const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
const nsTArray<int32_t>& aInputIndices, bool aFilterInputIsTainted,
nsTArray<bool>& aOutInputsAreTainted) {
for (const auto& inputIndex : aInputIndices) {
if (inputIndex < 0) {
aOutInputsAreTainted.AppendElement(aFilterInputIsTainted);
} else {
aOutInputsAreTainted.AppendElement(
aPrimitiveDescrs[inputIndex].IsTainted());
}
}
}
static int32_t GetLastResultIndex(
const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs) {
uint32_t numPrimitiveDescrs = aPrimitiveDescrs.Length();
return !numPrimitiveDescrs
? FilterPrimitiveDescription::kPrimitiveIndexSourceGraphic
: numPrimitiveDescrs - 1;
}
int32_t SVGFilterInstance::GetOrCreateSourceAlphaIndex(
nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs) {
// If the SourceAlpha index has already been determined or created for this
// SVG filter, just return it.
if (mSourceAlphaAvailable) {
return mSourceAlphaIndex;
}
// If this is the first filter in the chain, we can just use the
// kPrimitiveIndexSourceAlpha keyword to refer to the SourceAlpha of the
// original image.
if (mSourceGraphicIndex < 0) {
mSourceAlphaIndex = FilterPrimitiveDescription::kPrimitiveIndexSourceAlpha;
mSourceAlphaAvailable = true;
return mSourceAlphaIndex;
}
// Otherwise, create a primitive description to turn the previous filter's
// output into a SourceAlpha input.
FilterPrimitiveDescription descr(AsVariant(ToAlphaAttributes()));
descr.SetInputPrimitive(0, mSourceGraphicIndex);
const FilterPrimitiveDescription& sourcePrimitiveDescr =
aPrimitiveDescrs[mSourceGraphicIndex];
descr.SetPrimitiveSubregion(sourcePrimitiveDescr.PrimitiveSubregion());
descr.SetIsTainted(sourcePrimitiveDescr.IsTainted());
ColorSpace colorSpace = sourcePrimitiveDescr.OutputColorSpace();
descr.SetInputColorSpace(0, colorSpace);
descr.SetOutputColorSpace(colorSpace);
aPrimitiveDescrs.AppendElement(std::move(descr));
mSourceAlphaIndex = aPrimitiveDescrs.Length() - 1;
mSourceAlphaAvailable = true;
return mSourceAlphaIndex;
}
nsresult SVGFilterInstance::GetSourceIndices(
SVGFilterPrimitiveElement* aPrimitiveElement,
nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
const nsTHashMap<nsStringHashKey, int32_t>& aImageTable,
nsTArray<int32_t>& aSourceIndices) {
AutoTArray<SVGStringInfo, 2> sources;
aPrimitiveElement->GetSourceImageNames(sources);
for (const auto& source : sources) {
nsAutoString str;
source.mString->GetAnimValue(str, source.mElement);
int32_t sourceIndex = 0;
if (str.EqualsLiteral("SourceGraphic")) {
sourceIndex = mSourceGraphicIndex;
} else if (str.EqualsLiteral("SourceAlpha")) {
sourceIndex = GetOrCreateSourceAlphaIndex(aPrimitiveDescrs);
} 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 = GetLastResultIndex(aPrimitiveDescrs);
} else {
bool inputExists = aImageTable.Get(str, &sourceIndex);
if (!inputExists) {
sourceIndex = GetLastResultIndex(aPrimitiveDescrs);
}
}
aSourceIndices.AppendElement(sourceIndex);
}
return NS_OK;
}
nsresult SVGFilterInstance::BuildPrimitives(
nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
nsTArray<RefPtr<SourceSurface>>& aInputImages, bool aInputIsTainted) {
mSourceGraphicIndex = GetLastResultIndex(aPrimitiveDescrs);
// Clip previous filter's output to this filter's filter region.
if (mSourceGraphicIndex >= 0) {
FilterPrimitiveDescription& sourceDescr =
aPrimitiveDescrs[mSourceGraphicIndex];
sourceDescr.SetPrimitiveSubregion(
sourceDescr.PrimitiveSubregion().Intersect(mFilterSpaceBounds));
}
// Get the filter primitive elements.
AutoTArray<RefPtr<SVGFilterPrimitiveElement>, 8> primitives;
for (nsIContent* child = mFilterElement->nsINode::GetFirstChild(); child;
child = child->GetNextSibling()) {
if (auto* primitive = SVGFilterPrimitiveElement::FromNode(child)) {
primitives.AppendElement(primitive);
}
}
// Maps source image name to source index.
nsTHashMap<nsStringHashKey, int32_t> imageTable(8);
// The principal that we check principals of any loaded images against.
nsCOMPtr<nsIPrincipal> principal = mTargetContent->NodePrincipal();
for (uint32_t primitiveElementIndex = 0;
primitiveElementIndex < primitives.Length(); ++primitiveElementIndex) {
SVGFilterPrimitiveElement* filter = primitives[primitiveElementIndex];
AutoTArray<int32_t, 2> sourceIndices;
nsresult rv =
GetSourceIndices(filter, aPrimitiveDescrs, imageTable, sourceIndices);
if (NS_FAILED(rv)) {
return rv;
}
IntRect primitiveSubregion = ComputeFilterPrimitiveSubregion(
filter, aPrimitiveDescrs, sourceIndices);
AutoTArray<bool, 8> sourcesAreTainted;
GetInputsAreTainted(aPrimitiveDescrs, sourceIndices, aInputIsTainted,
sourcesAreTainted);
FilterPrimitiveDescription descr = filter->GetPrimitiveDescription(
this, primitiveSubregion, sourcesAreTainted, aInputImages);
descr.SetIsTainted(filter->OutputIsTainted(sourcesAreTainted, principal));
descr.SetFilterSpaceBounds(mFilterSpaceBounds);
descr.SetPrimitiveSubregion(
primitiveSubregion.Intersect(descr.FilterSpaceBounds()));
for (uint32_t i = 0; i < sourceIndices.Length(); i++) {
int32_t inputIndex = sourceIndices[i];
descr.SetInputPrimitive(i, inputIndex);
ColorSpace inputColorSpace =
inputIndex >= 0 ? aPrimitiveDescrs[inputIndex].OutputColorSpace()
: ColorSpace(ColorSpace::SRGB);
ColorSpace desiredInputColorSpace =
filter->GetInputColorSpace(i, inputColorSpace);
descr.SetInputColorSpace(i, desiredInputColorSpace);
if (i == 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());
}
aPrimitiveDescrs.AppendElement(std::move(descr));
uint32_t primitiveDescrIndex = aPrimitiveDescrs.Length() - 1;
nsAutoString str;
filter->GetResultImageName().GetAnimValue(str, filter);
imageTable.InsertOrUpdate(str, primitiveDescrIndex);
}
return NS_OK;
}
} // namespace mozilla