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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 GrCoverageSetOpXP_DEFINED
#define GrCoverageSetOpXP_DEFINED
#include "GrTypes.h"
#include "GrXferProcessor.h"
#include "SkRegion.h"
class GrProcOptInfo;
/**
* This xfer processor directly blends the the src coverage with the dst using a set operator. It is
* useful for rendering coverage masks using CSG. It can optionally invert the src coverage before
* applying the set operator.
* */
class GrCoverageSetOpXP : public GrXferProcessor {
public:
static GrXferProcessor* Create(SkRegion::Op regionOp, bool invertCoverage) {
return SkNEW_ARGS(GrCoverageSetOpXP, (regionOp, invertCoverage));
}
~GrCoverageSetOpXP() SK_OVERRIDE;
const char* name() const SK_OVERRIDE { return "Coverage Set Op"; }
GrGLXferProcessor* createGLInstance() const SK_OVERRIDE;
bool hasSecondaryOutput() const SK_OVERRIDE { return false; }
GrXferProcessor::OptFlags getOptimizations(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool doesStencilWrite,
GrColor* color,
const GrDrawTargetCaps& caps) SK_OVERRIDE;
void getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const SK_OVERRIDE;
bool invertCoverage() const { return fInvertCoverage; }
private:
GrCoverageSetOpXP(SkRegion::Op regionOp, bool fInvertCoverage);
void onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const SK_OVERRIDE;
bool onIsEqual(const GrXferProcessor& xpBase) const SK_OVERRIDE {
const GrCoverageSetOpXP& xp = xpBase.cast<GrCoverageSetOpXP>();
return (fRegionOp == xp.fRegionOp &&
fInvertCoverage == xp.fInvertCoverage);
}
SkRegion::Op fRegionOp;
bool fInvertCoverage;
typedef GrXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class GrCoverageSetOpXPFactory : public GrXPFactory {
public:
static GrXPFactory* Create(SkRegion::Op regionOp, bool invertCoverage = false);
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:
GrCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage);
GrXferProcessor* onCreateXferProcessor(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
const GrDeviceCoordTexture* dstCopy) const SK_OVERRIDE;
bool willReadDstColor() const SK_OVERRIDE { return false; }
bool onIsEqual(const GrXPFactory& xpfBase) const SK_OVERRIDE {
const GrCoverageSetOpXPFactory& xpf = xpfBase.cast<GrCoverageSetOpXPFactory>();
return fRegionOp == xpf.fRegionOp;
}
GR_DECLARE_XP_FACTORY_TEST;
SkRegion::Op fRegionOp;
bool fInvertCoverage;
typedef GrXPFactory INHERITED;
};
#endif
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