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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrCustomXfermodePriv_DEFINED
#define GrCustomXfermodePriv_DEFINED
#include "GrCoordTransform.h"
#include "GrDrawTargetCaps.h"
#include "GrFragmentProcessor.h"
#include "GrTextureAccess.h"
#include "GrXferProcessor.h"
#include "SkXfermode.h"
class GrGLCaps;
class GrGLFragmentProcessor;
class GrInvariantOutput;
class GrProcessorKeyBuilder;
class GrTexture;
///////////////////////////////////////////////////////////////////////////////
// Fragment Processor
///////////////////////////////////////////////////////////////////////////////
class GrCustomXferFP : public GrFragmentProcessor {
public:
GrCustomXferFP(SkXfermode::Mode mode, GrTexture* background);
void getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const SK_OVERRIDE;
GrGLFragmentProcessor* createGLInstance() const SK_OVERRIDE;
const char* name() const SK_OVERRIDE { return "Custom Xfermode"; }
SkXfermode::Mode mode() const { return fMode; }
const GrTextureAccess& backgroundAccess() const { return fBackgroundAccess; }
private:
bool onIsEqual(const GrFragmentProcessor& other) const SK_OVERRIDE;
void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
SkXfermode::Mode fMode;
GrCoordTransform fBackgroundTransform;
GrTextureAccess fBackgroundAccess;
typedef GrFragmentProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
// Xfer Processor
///////////////////////////////////////////////////////////////////////////////
class GrCustomXP : public GrXferProcessor {
public:
static GrXferProcessor* Create(SkXfermode::Mode mode, const GrDeviceCoordTexture* dstCopy,
bool willReadDstColor) {
if (!GrCustomXfermode::IsSupportedMode(mode)) {
return NULL;
} else {
return SkNEW_ARGS(GrCustomXP, (mode, dstCopy, willReadDstColor));
}
}
~GrCustomXP() SK_OVERRIDE {};
const char* name() const SK_OVERRIDE { return "Custom Xfermode"; }
GrGLXferProcessor* createGLInstance() const SK_OVERRIDE;
bool hasSecondaryOutput() const SK_OVERRIDE { return false; }
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 = kOne_GrBlendCoeff;
blendInfo->fDstBlend = kZero_GrBlendCoeff;
blendInfo->fBlendConstant = 0;
}
SkXfermode::Mode mode() const { return fMode; }
private:
GrCustomXP(SkXfermode::Mode mode, const GrDeviceCoordTexture* dstCopy, bool willReadDstColor);
void onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const SK_OVERRIDE;
bool onIsEqual(const GrXferProcessor& xpBase) const SK_OVERRIDE;
SkXfermode::Mode fMode;
typedef GrXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class GrCustomXPFactory : public GrXPFactory {
public:
GrCustomXPFactory(SkXfermode::Mode mode);
bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE {
return true;
}
bool canApplyCoverage(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI) const SK_OVERRIDE {
return true;
}
bool canTweakAlphaForCoverage() const SK_OVERRIDE {
return false;
}
void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
GrXPFactory::InvariantOutput*) const SK_OVERRIDE;
private:
GrXferProcessor* onCreateXferProcessor(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
const GrDeviceCoordTexture* dstCopy) const SK_OVERRIDE {
return GrCustomXP::Create(fMode, dstCopy, this->willReadDstColor());
}
bool willReadDstColor() const SK_OVERRIDE { return true; }
bool onIsEqual(const GrXPFactory& xpfBase) const SK_OVERRIDE {
const GrCustomXPFactory& xpf = xpfBase.cast<GrCustomXPFactory>();
return fMode == xpf.fMode;
}
GR_DECLARE_XP_FACTORY_TEST;
SkXfermode::Mode fMode;
typedef GrXPFactory INHERITED;
};
#endif
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