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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "effects/GrCoverageSetOpXP.h"
#include "GrColor.h"
#include "GrDrawTargetCaps.h"
#include "GrProcessor.h"
#include "GrProcOptInfo.h"
#include "gl/GrGLXferProcessor.h"
#include "gl/builders/GrGLFragmentShaderBuilder.h"
#include "gl/builders/GrGLProgramBuilder.h"
class CoverageSetOpXP : public GrXferProcessor {
public:
static GrXferProcessor* Create(SkRegion::Op regionOp, bool invertCoverage) {
return SkNEW_ARGS(CoverageSetOpXP, (regionOp, invertCoverage));
}
~CoverageSetOpXP() override;
const char* name() const override { return "Coverage Set Op"; }
GrGLXferProcessor* createGLInstance() const override;
bool hasSecondaryOutput() const override { return false; }
GrXferProcessor::OptFlags getOptimizations(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool doesStencilWrite,
GrColor* color,
const GrDrawTargetCaps& caps) override;
void getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const override;
bool invertCoverage() const { return fInvertCoverage; }
private:
CoverageSetOpXP(SkRegion::Op regionOp, bool fInvertCoverage);
void onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const override;
bool onIsEqual(const GrXferProcessor& xpBase) const override {
const CoverageSetOpXP& xp = xpBase.cast<CoverageSetOpXP>();
return (fRegionOp == xp.fRegionOp &&
fInvertCoverage == xp.fInvertCoverage);
}
SkRegion::Op fRegionOp;
bool fInvertCoverage;
typedef GrXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class GLCoverageSetOpXP : public GrGLXferProcessor {
public:
GLCoverageSetOpXP(const GrProcessor&) {}
~GLCoverageSetOpXP() override {}
static void GenKey(const GrProcessor& processor, const GrGLCaps& caps,
GrProcessorKeyBuilder* b) {
const CoverageSetOpXP& xp = processor.cast<CoverageSetOpXP>();
uint32_t key = xp.invertCoverage() ? 0x0 : 0x1;
b->add32(key);
};
private:
void onEmitCode(const EmitArgs& args) override {
const CoverageSetOpXP& xp = args.fXP.cast<CoverageSetOpXP>();
GrGLFPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
if (xp.invertCoverage()) {
fsBuilder->codeAppendf("%s = 1.0 - %s;", args.fOutputPrimary, args.fInputCoverage);
} else {
fsBuilder->codeAppendf("%s = %s;", args.fOutputPrimary, args.fInputCoverage);
}
}
void onSetData(const GrGLProgramDataManager&, const GrXferProcessor&) override {};
typedef GrGLXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
CoverageSetOpXP::CoverageSetOpXP(SkRegion::Op regionOp, bool invertCoverage)
: fRegionOp(regionOp)
, fInvertCoverage(invertCoverage) {
this->initClassID<CoverageSetOpXP>();
}
CoverageSetOpXP::~CoverageSetOpXP() {
}
void CoverageSetOpXP::onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const {
GLCoverageSetOpXP::GenKey(*this, caps, b);
}
GrGLXferProcessor* CoverageSetOpXP::createGLInstance() const {
return SkNEW_ARGS(GLCoverageSetOpXP, (*this));
}
GrXferProcessor::OptFlags
CoverageSetOpXP::getOptimizations(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool doesStencilWrite,
GrColor* color,
const GrDrawTargetCaps& caps) {
// We never look at the color input
return GrXferProcessor::kIgnoreColor_OptFlag;
}
void CoverageSetOpXP::getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const {
switch (fRegionOp) {
case SkRegion::kReplace_Op:
blendInfo->fSrcBlend = kOne_GrBlendCoeff;
blendInfo->fDstBlend = kZero_GrBlendCoeff;
break;
case SkRegion::kIntersect_Op:
blendInfo->fSrcBlend = kDC_GrBlendCoeff;
blendInfo->fDstBlend = kZero_GrBlendCoeff;
break;
case SkRegion::kUnion_Op:
blendInfo->fSrcBlend = kOne_GrBlendCoeff;
blendInfo->fDstBlend = kISC_GrBlendCoeff;
break;
case SkRegion::kXOR_Op:
blendInfo->fSrcBlend = kIDC_GrBlendCoeff;
blendInfo->fDstBlend = kISC_GrBlendCoeff;
break;
case SkRegion::kDifference_Op:
blendInfo->fSrcBlend = kZero_GrBlendCoeff;
blendInfo->fDstBlend = kISC_GrBlendCoeff;
break;
case SkRegion::kReverseDifference_Op:
blendInfo->fSrcBlend = kIDC_GrBlendCoeff;
blendInfo->fDstBlend = kZero_GrBlendCoeff;
break;
}
blendInfo->fBlendConstant = 0;
}
///////////////////////////////////////////////////////////////////////////////
GrCoverageSetOpXPFactory::GrCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage)
: fRegionOp(regionOp)
, fInvertCoverage(invertCoverage) {
this->initClassID<GrCoverageSetOpXPFactory>();
}
GrXPFactory* GrCoverageSetOpXPFactory::Create(SkRegion::Op regionOp, bool invertCoverage) {
switch (regionOp) {
case SkRegion::kReplace_Op: {
if (invertCoverage) {
static GrCoverageSetOpXPFactory gReplaceCDXPFI(regionOp, invertCoverage);
return SkRef(&gReplaceCDXPFI);
} else {
static GrCoverageSetOpXPFactory gReplaceCDXPF(regionOp, invertCoverage);
return SkRef(&gReplaceCDXPF);
}
break;
}
case SkRegion::kIntersect_Op: {
if (invertCoverage) {
static GrCoverageSetOpXPFactory gIntersectCDXPFI(regionOp, invertCoverage);
return SkRef(&gIntersectCDXPFI);
} else {
static GrCoverageSetOpXPFactory gIntersectCDXPF(regionOp, invertCoverage);
return SkRef(&gIntersectCDXPF);
}
break;
}
case SkRegion::kUnion_Op: {
if (invertCoverage) {
static GrCoverageSetOpXPFactory gUnionCDXPFI(regionOp, invertCoverage);
return SkRef(&gUnionCDXPFI);
} else {
static GrCoverageSetOpXPFactory gUnionCDXPF(regionOp, invertCoverage);
return SkRef(&gUnionCDXPF);
}
break;
}
case SkRegion::kXOR_Op: {
if (invertCoverage) {
static GrCoverageSetOpXPFactory gXORCDXPFI(regionOp, invertCoverage);
return SkRef(&gXORCDXPFI);
} else {
static GrCoverageSetOpXPFactory gXORCDXPF(regionOp, invertCoverage);
return SkRef(&gXORCDXPF);
}
break;
}
case SkRegion::kDifference_Op: {
if (invertCoverage) {
static GrCoverageSetOpXPFactory gDifferenceCDXPFI(regionOp, invertCoverage);
return SkRef(&gDifferenceCDXPFI);
} else {
static GrCoverageSetOpXPFactory gDifferenceCDXPF(regionOp, invertCoverage);
return SkRef(&gDifferenceCDXPF);
}
break;
}
case SkRegion::kReverseDifference_Op: {
if (invertCoverage) {
static GrCoverageSetOpXPFactory gRevDiffCDXPFI(regionOp, invertCoverage);
return SkRef(&gRevDiffCDXPFI);
} else {
static GrCoverageSetOpXPFactory gRevDiffCDXPF(regionOp, invertCoverage);
return SkRef(&gRevDiffCDXPF);
}
break;
}
default:
return NULL;
}
}
GrXferProcessor*
GrCoverageSetOpXPFactory::onCreateXferProcessor(const GrDrawTargetCaps& caps,
const GrProcOptInfo& colorPOI,
const GrProcOptInfo& covPOI,
const GrDeviceCoordTexture* dstCopy) const {
return CoverageSetOpXP::Create(fRegionOp, fInvertCoverage);
}
void GrCoverageSetOpXPFactory::getInvariantOutput(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
GrXPFactory::InvariantOutput* output) const {
if (SkRegion::kReplace_Op == fRegionOp) {
if (coveragePOI.isSolidWhite()) {
output->fBlendedColor = GrColor_WHITE;
output->fBlendedColorFlags = kRGBA_GrColorComponentFlags;
} else {
output->fBlendedColorFlags = 0;
}
output->fWillBlendWithDst = false;
} else {
output->fBlendedColorFlags = 0;
output->fWillBlendWithDst = true;
}
}
GR_DEFINE_XP_FACTORY_TEST(GrCoverageSetOpXPFactory);
GrXPFactory* GrCoverageSetOpXPFactory::TestCreate(SkRandom* random,
GrContext*,
const GrDrawTargetCaps&,
GrTexture*[]) {
SkRegion::Op regionOp = SkRegion::Op(random->nextULessThan(SkRegion::kLastOp + 1));
bool invertCoverage = random->nextBool();
return GrCoverageSetOpXPFactory::Create(regionOp, invertCoverage);
}
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