skia2/include/gpu/effects/GrCoverageSetOpXP.h
2015-06-08 15:11:04 -07:00

64 lines
2.0 KiB
C++

/*
* 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 GrCoverageSetOpXPFactory : public GrXPFactory {
public:
static GrXPFactory* Create(SkRegion::Op regionOp, bool invertCoverage = false);
bool supportsRGBCoverage(GrColor /*knownColor*/,
uint32_t /*knownColorFlags*/) const override {
return true;
}
void getInvariantBlendedColor(const GrProcOptInfo& colorPOI,
GrXPFactory::InvariantBlendedColor*) const override;
private:
GrCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage);
GrXferProcessor* onCreateXferProcessor(const GrCaps& caps,
const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool hasMixedSamples,
const DstTexture*) const override;
bool willReadDstColor(const GrCaps& /*caps*/,
const GrProcOptInfo& /*colorPOI*/,
const GrProcOptInfo& /*coveragePOI*/,
bool /*hasMixedSamples*/) const override {
return false;
}
bool onIsEqual(const GrXPFactory& xpfBase) const 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