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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 GrDrawTargetCaps;
class GrProcOptInfo;
class GrPorterDuffXferProcessor : public GrXferProcessor {
public:
static GrXferProcessor* Create(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend,
GrColor constant, const GrDeviceCoordTexture* dstCopy,
bool willReadDstColor) {
return SkNEW_ARGS(GrPorterDuffXferProcessor, (srcBlend, dstBlend, constant, dstCopy,
willReadDstColor));
}
~GrPorterDuffXferProcessor() SK_OVERRIDE;
const char* name() const SK_OVERRIDE { return "Porter Duff"; }
GrGLXferProcessor* createGLInstance() const SK_OVERRIDE;
bool hasSecondaryOutput() const SK_OVERRIDE;
///////////////////////////////////////////////////////////////////////////
/// @name Stage Output Types
////
enum PrimaryOutputType {
kNone_PrimaryOutputType,
kColor_PrimaryOutputType,
kCoverage_PrimaryOutputType,
// Modulate color and coverage, write result as the color output.
kModulate_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 doesStencilWrite,
GrColor* overrideColor,
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,
const GrDeviceCoordTexture* dstCopy, bool willReadDstColor);
void onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const SK_OVERRIDE;
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;
}
GrXferProcessor::OptFlags internalGetOptimizations(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool doesStencilWrite);
void calcOutputTypes(GrXferProcessor::OptFlags blendOpts, const GrDrawTargetCaps& caps,
bool hasSolidCoverage);
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));
}
bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE;
bool canApplyCoverage(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI) const SK_OVERRIDE;
bool canTweakAlphaForCoverage() const SK_OVERRIDE;
void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
GrXPFactory::InvariantOutput*) const SK_OVERRIDE;
private:
GrPorterDuffXPFactory(GrBlendCoeff src, GrBlendCoeff dst);
GrXferProcessor* onCreateXferProcessor(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
const GrDeviceCoordTexture* dstCopy) const SK_OVERRIDE;
bool willReadDstColor() const SK_OVERRIDE;
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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