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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 GrBackendFragmentProcessorFactory;
class GrDrawState;
class GrGLPorterDuffXferProcessor;
class GrInvariantOutput;
class GrPorterDuffXferProcessor : public GrXferProcessor {
public:
static GrXferProcessor* Create(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend) {
return SkNEW_ARGS(GrPorterDuffXferProcessor, (srcBlend, dstBlend));
}
virtual ~GrPorterDuffXferProcessor();
virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE;
typedef GrGLPorterDuffXferProcessor GLProcessor;
static const char* Name() { return "Porter Duff"; }
private:
GrPorterDuffXferProcessor(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend);
virtual bool onIsEqual(const GrFragmentProcessor& fpBase) const SK_OVERRIDE {
const GrPorterDuffXferProcessor& xp = fpBase.cast<GrPorterDuffXferProcessor>();
if (fSrcBlend != xp.fSrcBlend || fDstBlend != xp.fDstBlend) {
return false;
}
return true;
}
virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
GrBlendCoeff fSrcBlend;
GrBlendCoeff fDstBlend;
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));
}
const GrXferProcessor* createXferProcessor() const SK_OVERRIDE;
bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE;
private:
GrPorterDuffXPFactory(GrBlendCoeff src, GrBlendCoeff dst)
: fSrc(src), fDst(dst) {}
GrBlendCoeff fSrc;
GrBlendCoeff fDst;
typedef GrXPFactory INHERITED;
};
#endif
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