gecko-dev/layout/svg/SVGContextPaint.cpp
cku a55d02afd1 Bug 1345853 - Part 4. Pass sync decode flag down to nsSVGPatternFrame::PaintPattern. r=tnikkel
MozReview-Commit-ID: 1bHMINhs121

--HG--
extra : rebase_source : 8da9c0d77dd9a32be392f43d3be266d365894b3a
2017-03-25 03:19:18 +08:00

359 lines
13 KiB
C++

/* 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/. */
#include "SVGContextPaint.h"
#include "gfxContext.h"
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "nsIDocument.h"
#include "nsSVGPaintServerFrame.h"
#include "nsSVGEffects.h"
#include "nsSVGPaintServerFrame.h"
using namespace mozilla::gfx;
using namespace mozilla::image;
namespace mozilla {
/**
* Stores in |aTargetPaint| information on how to reconstruct the current
* fill or stroke pattern. Will also set the paint opacity to transparent if
* the paint is set to "none".
* @param aOuterContextPaint pattern information from the outer text context
* @param aTargetPaint where to store the current pattern information
* @param aFillOrStroke member pointer to the paint we are setting up
* @param aProperty the frame property descriptor of the fill or stroke paint
* server frame
*/
static DrawResult
SetupInheritablePaint(const DrawTarget* aDrawTarget,
const gfxMatrix& aContextMatrix,
nsIFrame* aFrame,
float& aOpacity,
SVGContextPaint* aOuterContextPaint,
SVGContextPaintImpl::Paint& aTargetPaint,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
nsSVGEffects::PaintingPropertyDescriptor aProperty)
{
const nsStyleSVG *style = aFrame->StyleSVG();
nsSVGPaintServerFrame *ps =
nsSVGEffects::GetPaintServer(aFrame, aFillOrStroke, aProperty);
DrawResult result = DrawResult::SUCCESS;
if (ps) {
RefPtr<gfxPattern> pattern;
Tie(result, pattern) =
ps->GetPaintServerPattern(aFrame, aDrawTarget, aContextMatrix,
aFillOrStroke, aOpacity);
if (pattern) {
aTargetPaint.SetPaintServer(aFrame, aContextMatrix, ps);
return result;
}
}
if (aOuterContextPaint) {
RefPtr<gfxPattern> pattern;
switch ((style->*aFillOrStroke).Type()) {
case eStyleSVGPaintType_ContextFill:
Tie(result, pattern) =
aOuterContextPaint->GetFillPattern(aDrawTarget, aOpacity,
aContextMatrix);
break;
case eStyleSVGPaintType_ContextStroke:
Tie(result, pattern) =
aOuterContextPaint->GetStrokePattern(aDrawTarget, aOpacity,
aContextMatrix);
break;
default:
;
}
if (pattern) {
aTargetPaint.SetContextPaint(aOuterContextPaint, (style->*aFillOrStroke).Type());
return result;
}
}
nscolor color =
nsSVGUtils::GetFallbackOrPaintColor(aFrame->StyleContext(), aFillOrStroke);
aTargetPaint.SetColor(color);
return result;
}
mozilla::Pair<DrawResult, DrawMode>
SVGContextPaintImpl::Init(const DrawTarget* aDrawTarget,
const gfxMatrix& aContextMatrix,
nsIFrame* aFrame,
SVGContextPaint* aOuterContextPaint)
{
DrawMode toDraw = DrawMode(0);
const nsStyleSVG *style = aFrame->StyleSVG();
DrawResult result = DrawResult::SUCCESS;
// fill:
if (style->mFill.Type() == eStyleSVGPaintType_None) {
SetFillOpacity(0.0f);
} else {
float opacity = nsSVGUtils::GetOpacity(style->FillOpacitySource(),
style->mFillOpacity,
aOuterContextPaint);
result &= SetupInheritablePaint(aDrawTarget, aContextMatrix, aFrame,
opacity, aOuterContextPaint,
mFillPaint, &nsStyleSVG::mFill,
nsSVGEffects::FillProperty());
SetFillOpacity(opacity);
toDraw |= DrawMode::GLYPH_FILL;
}
// stroke:
if (style->mStroke.Type() == eStyleSVGPaintType_None) {
SetStrokeOpacity(0.0f);
} else {
float opacity = nsSVGUtils::GetOpacity(style->StrokeOpacitySource(),
style->mStrokeOpacity,
aOuterContextPaint);
result &= SetupInheritablePaint(aDrawTarget, aContextMatrix, aFrame,
opacity, aOuterContextPaint,
mStrokePaint, &nsStyleSVG::mStroke,
nsSVGEffects::StrokeProperty());
SetStrokeOpacity(opacity);
toDraw |= DrawMode::GLYPH_STROKE;
}
return MakePair(result, toDraw);
}
void
SVGContextPaint::InitStrokeGeometry(gfxContext* aContext,
float devUnitsPerSVGUnit)
{
mStrokeWidth = aContext->CurrentLineWidth() / devUnitsPerSVGUnit;
aContext->CurrentDash(mDashes, &mDashOffset);
for (uint32_t i = 0; i < mDashes.Length(); i++) {
mDashes[i] /= devUnitsPerSVGUnit;
}
mDashOffset /= devUnitsPerSVGUnit;
}
/* static */ SVGContextPaint*
SVGContextPaint::GetContextPaint(nsIContent* aContent)
{
nsIDocument* ownerDoc = aContent->OwnerDoc();
if (!ownerDoc->IsBeingUsedAsImage()) {
return nullptr;
}
// XXX The SVGContextPaint that was passed to SetProperty was const. Ideally
// we could and should re-apply that constness to the SVGContextPaint that
// we get here (SVGImageContext is never changed after it is initialized).
// Unfortunately lazy initialization of SVGContextPaint (which is a member of
// SVGImageContext, and also conceptually never changes after construction)
// prevents some of SVGContextPaint's conceptually const methods from being
// const. Trying to fix SVGContextPaint (perhaps by using |mutable|) is a
// bit of a headache so for now we punt on that, don't reapply the constness
// to the SVGContextPaint here, and trust that no one will add code that
// actually modifies the object.
return static_cast<SVGContextPaint*>(
ownerDoc->GetProperty(nsGkAtoms::svgContextPaint));
}
mozilla::Pair<DrawResult, RefPtr<gfxPattern>>
SVGContextPaintImpl::GetFillPattern(const DrawTarget* aDrawTarget,
float aOpacity,
const gfxMatrix& aCTM,
uint32_t aFlags)
{
return mFillPaint.GetPattern(aDrawTarget, aOpacity, &nsStyleSVG::mFill, aCTM,
aFlags);
}
mozilla::Pair<DrawResult, RefPtr<gfxPattern>>
SVGContextPaintImpl::GetStrokePattern(const DrawTarget* aDrawTarget,
float aOpacity,
const gfxMatrix& aCTM,
uint32_t aFlags)
{
return mStrokePaint.GetPattern(aDrawTarget, aOpacity, &nsStyleSVG::mStroke,
aCTM, aFlags);
}
mozilla::Pair<DrawResult, RefPtr<gfxPattern>>
SVGContextPaintImpl::Paint::GetPattern(const DrawTarget* aDrawTarget,
float aOpacity,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
const gfxMatrix& aCTM,
uint32_t aFlags)
{
RefPtr<gfxPattern> pattern;
if (mPatternCache.Get(aOpacity, getter_AddRefs(pattern))) {
// Set the pattern matrix just in case it was messed with by a previous
// caller. We should get the same matrix each time a pattern is constructed
// so this should be fine.
pattern->SetMatrix(aCTM * mPatternMatrix);
return MakePair(DrawResult::SUCCESS, Move(pattern));
}
DrawResult result = DrawResult::SUCCESS;
switch (mPaintType) {
case eStyleSVGPaintType_None:
pattern = new gfxPattern(Color());
mPatternMatrix = gfxMatrix();
break;
case eStyleSVGPaintType_Color: {
Color color = Color::FromABGR(mPaintDefinition.mColor);
color.a *= aOpacity;
pattern = new gfxPattern(color);
mPatternMatrix = gfxMatrix();
break;
}
case eStyleSVGPaintType_Server:
Tie(result, pattern) =
mPaintDefinition.mPaintServerFrame->GetPaintServerPattern(mFrame,
aDrawTarget,
mContextMatrix,
aFillOrStroke,
aOpacity,
nullptr,
aFlags);
{
// m maps original-user-space to pattern space
gfxMatrix m = pattern->GetMatrix();
gfxMatrix deviceToOriginalUserSpace = mContextMatrix;
if (!deviceToOriginalUserSpace.Invert()) {
return MakePair(DrawResult::SUCCESS, RefPtr<gfxPattern>());
}
// mPatternMatrix maps device space to pattern space via original user space
mPatternMatrix = deviceToOriginalUserSpace * m;
}
pattern->SetMatrix(aCTM * mPatternMatrix);
break;
case eStyleSVGPaintType_ContextFill:
Tie(result, pattern) =
mPaintDefinition.mContextPaint->GetFillPattern(aDrawTarget,
aOpacity, aCTM, aFlags);
// Don't cache this. mContextPaint will have cached it anyway. If we
// cache it, we'll have to compute mPatternMatrix, which is annoying.
return MakePair(result, Move(pattern));
case eStyleSVGPaintType_ContextStroke:
Tie(result, pattern) =
mPaintDefinition.mContextPaint->GetStrokePattern(aDrawTarget,
aOpacity, aCTM, aFlags);
// Don't cache this. mContextPaint will have cached it anyway. If we
// cache it, we'll have to compute mPatternMatrix, which is annoying.
return MakePair(result, Move(pattern));
default:
MOZ_ASSERT(false, "invalid paint type");
return MakePair(DrawResult::SUCCESS, RefPtr<gfxPattern>());
}
mPatternCache.Put(aOpacity, pattern);
return MakePair(result, Move(pattern));
}
AutoSetRestoreSVGContextPaint::AutoSetRestoreSVGContextPaint(
const SVGContextPaint* aContextPaint,
nsIDocument* aSVGDocument)
: mSVGDocument(aSVGDocument)
, mOuterContextPaint(aSVGDocument->GetProperty(nsGkAtoms::svgContextPaint))
{
// The way that we supply context paint is to temporarily set the context
// paint on the owner document of the SVG that we're painting while it's
// being painted.
MOZ_ASSERT(aContextPaint);
MOZ_ASSERT(aSVGDocument->IsBeingUsedAsImage(),
"SVGContextPaint::GetContextPaint assumes this");
if (mOuterContextPaint) {
mSVGDocument->UnsetProperty(nsGkAtoms::svgContextPaint);
}
DebugOnly<nsresult> res =
mSVGDocument->SetProperty(nsGkAtoms::svgContextPaint,
const_cast<SVGContextPaint*>(aContextPaint));
NS_WARNING_ASSERTION(NS_SUCCEEDED(res), "Failed to set context paint");
}
AutoSetRestoreSVGContextPaint::~AutoSetRestoreSVGContextPaint()
{
mSVGDocument->UnsetProperty(nsGkAtoms::svgContextPaint);
if (mOuterContextPaint) {
DebugOnly<nsresult> res =
mSVGDocument->SetProperty(nsGkAtoms::svgContextPaint, mOuterContextPaint);
NS_WARNING_ASSERTION(NS_SUCCEEDED(res), "Failed to restore context paint");
}
}
// SVGEmbeddingContextPaint
mozilla::Pair<DrawResult, RefPtr<gfxPattern>>
SVGEmbeddingContextPaint::GetFillPattern(const DrawTarget* aDrawTarget,
float aFillOpacity,
const gfxMatrix& aCTM,
uint32_t aFlags)
{
if (!mFill) {
return MakePair(DrawResult::SUCCESS, RefPtr<gfxPattern>());
}
// The gfxPattern that we create below depends on aFillOpacity, and since
// different elements in the SVG image may pass in different values for
// fill opacities we don't try to cache the gfxPattern that we create.
Color fill = *mFill;
fill.a *= aFillOpacity;
RefPtr<gfxPattern> patern = new gfxPattern(fill);
return MakePair(DrawResult::SUCCESS, Move(patern));
}
mozilla::Pair<DrawResult, RefPtr<gfxPattern>>
SVGEmbeddingContextPaint::GetStrokePattern(const DrawTarget* aDrawTarget,
float aStrokeOpacity,
const gfxMatrix& aCTM,
uint32_t aFlags)
{
if (!mStroke) {
return MakePair(DrawResult::SUCCESS, RefPtr<gfxPattern>());
}
Color stroke = *mStroke;
stroke.a *= aStrokeOpacity;
RefPtr<gfxPattern> patern = new gfxPattern(stroke);
return MakePair(DrawResult::SUCCESS, Move(patern));
}
uint32_t
SVGEmbeddingContextPaint::Hash() const
{
uint32_t hash = 0;
if (mFill) {
hash = HashGeneric(hash, mFill->ToABGR());
} else {
// Arbitrary number, just to avoid trivial hash collisions between pairs of
// instances where one embedding context has fill set to the same value as
// another context has stroke set to.
hash = 1;
}
if (mStroke) {
hash = HashGeneric(hash, mStroke->ToABGR());
}
return hash;
}
} // namespace mozilla