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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.
*/
#ifndef GrPorterDuffXferProcessor_DEFINED
#define GrPorterDuffXferProcessor_DEFINED
#include "GrTypes.h"
#include "GrXferProcessor.h"
#include "SkXfermode.h"
class GrDrawState;
class GrInvariantOutput;
class GrPorterDuffXferProcessor : public GrXferProcessor {
public:
static GrXferProcessor* Create(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend,
GrColor constant = 0) {
return SkNEW_ARGS(GrPorterDuffXferProcessor, (srcBlend, dstBlend, constant));
}
virtual ~GrPorterDuffXferProcessor();
virtual const char* name() const SK_OVERRIDE { return "Porter Duff"; }
void getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const SK_OVERRIDE;
GrGLXferProcessor* createGLInstance() const SK_OVERRIDE;
virtual bool hasSecondaryOutput() const SK_OVERRIDE;
///////////////////////////////////////////////////////////////////////////
/// @name Stage Output Types
////
enum PrimaryOutputType {
// Modulate color and coverage, write result as the color output.
kModulate_PrimaryOutputType,
// Combines the coverage, dst, and color as coverage * color + (1 - coverage) * dst. This
// can only be set if fDstReadKey is non-zero.
kCombineWithDst_PrimaryOutputType,
};
enum SecondaryOutputType {
// There is no secondary output
kNone_SecondaryOutputType,
// Writes coverage as the secondary output. Only set if dual source blending is supported
// and primary output is kModulate.
kCoverage_SecondaryOutputType,
// Writes coverage * (1 - colorA) as the secondary output. Only set if dual source blending
// is supported and primary output is kModulate.
kCoverageISA_SecondaryOutputType,
// Writes coverage * (1 - colorRGBA) as the secondary output. Only set if dual source
// blending is supported and primary output is kModulate.
kCoverageISC_SecondaryOutputType,
kSecondaryOutputTypeCnt,
};
PrimaryOutputType primaryOutputType() const { return fPrimaryOutputType; }
SecondaryOutputType secondaryOutputType() const { return fSecondaryOutputType; }
GrXferProcessor::OptFlags getOptimizations(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool isCoverageDrawing,
bool colorWriteDisabled,
bool doesStencilWrite,
GrColor* color,
uint8_t* coverage,
const GrDrawTargetCaps& caps) SK_OVERRIDE;
void getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const SK_OVERRIDE {
blendInfo->fSrcBlend = fSrcBlend;
blendInfo->fDstBlend = fDstBlend;
blendInfo->fBlendConstant = fBlendConstant;
}
private:
GrPorterDuffXferProcessor(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend, GrColor constant);
bool onIsEqual(const GrXferProcessor& xpBase) const SK_OVERRIDE {
const GrPorterDuffXferProcessor& xp = xpBase.cast<GrPorterDuffXferProcessor>();
if (fSrcBlend != xp.fSrcBlend ||
fDstBlend != xp.fDstBlend ||
fBlendConstant != xp.fBlendConstant ||
fPrimaryOutputType != xp.fPrimaryOutputType ||
fSecondaryOutputType != xp.fSecondaryOutputType) {
return false;
}
return true;
}
void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
GrXferProcessor::OptFlags internalGetOptimizations(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool isCoverageDrawing,
bool colorWriteDisabled,
bool doesStencilWrite,
GrColor* color,
uint8_t* coverage);
void calcOutputTypes(GrXferProcessor::OptFlags blendOpts, const GrDrawTargetCaps& caps,
bool hasSolidCoverage, bool readDst);
GrBlendCoeff fSrcBlend;
GrBlendCoeff fDstBlend;
GrColor fBlendConstant;
PrimaryOutputType fPrimaryOutputType;
SecondaryOutputType fSecondaryOutputType;
typedef GrXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class GrPorterDuffXPFactory : public GrXPFactory {
public:
static GrXPFactory* Create(SkXfermode::Mode mode);
static GrXPFactory* Create(SkXfermode::Coeff src, SkXfermode::Coeff dst) {
return SkNEW_ARGS(GrPorterDuffXPFactory, ((GrBlendCoeff)(src), (GrBlendCoeff)(dst)));
}
static GrXPFactory* Create(GrBlendCoeff src, GrBlendCoeff dst) {
return SkNEW_ARGS(GrPorterDuffXPFactory, (src, dst));
}
GrXferProcessor* createXferProcessor(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI) const SK_OVERRIDE;
bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE;
bool canApplyCoverage(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
bool isCoverageDrawing, bool colorWriteDisabled) const SK_OVERRIDE;
bool willBlendWithDst(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
bool isCoverageDrawing, bool colorWriteDisabled) const SK_OVERRIDE;
bool canTweakAlphaForCoverage(bool isCoverageDrawing) const SK_OVERRIDE;
bool getOpaqueAndKnownColor(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
GrColor* solidColor,
uint32_t* solidColorKnownComponents) const SK_OVERRIDE;
private:
GrPorterDuffXPFactory(GrBlendCoeff src, GrBlendCoeff dst);
bool onIsEqual(const GrXPFactory& xpfBase) const SK_OVERRIDE {
const GrPorterDuffXPFactory& xpf = xpfBase.cast<GrPorterDuffXPFactory>();
return (fSrcCoeff == xpf.fSrcCoeff && fDstCoeff == xpf.fDstCoeff);
}
GR_DECLARE_XP_FACTORY_TEST;
GrBlendCoeff fSrcCoeff;
GrBlendCoeff fDstCoeff;
typedef GrXPFactory INHERITED;
};
#endif
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