2014-12-17 21:37:13 +00:00
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/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrCoverageSetOpXP_DEFINED
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#define GrCoverageSetOpXP_DEFINED
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#include "GrTypes.h"
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#include "GrXferProcessor.h"
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#include "SkRegion.h"
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class GrInvariantOutput;
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class GrProcOptInfo;
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/**
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* This xfer processor directly blends the the src coverage with the dst using a set operator. It is
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* useful for rendering coverage masks using CSG. It can optionally invert the src coverage before
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* applying the set operator.
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* */
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class GrCoverageSetOpXP : public GrXferProcessor {
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public:
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static GrXferProcessor* Create(SkRegion::Op regionOp, bool invertCoverage) {
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return SkNEW_ARGS(GrCoverageSetOpXP, (regionOp, invertCoverage));
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}
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~GrCoverageSetOpXP() SK_OVERRIDE;
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2014-12-18 01:50:21 +00:00
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virtual const char* name() const SK_OVERRIDE { return "Coverage Set Op"; }
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2014-12-17 21:37:13 +00:00
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void getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const SK_OVERRIDE;
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GrGLXferProcessor* createGLInstance() const SK_OVERRIDE;
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bool hasSecondaryOutput() const SK_OVERRIDE { return false; }
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GrXferProcessor::OptFlags getOptimizations(const GrProcOptInfo& colorPOI,
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const GrProcOptInfo& coveragePOI,
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bool colorWriteDisabled,
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bool doesStencilWrite,
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GrColor* color,
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const GrDrawTargetCaps& caps) SK_OVERRIDE;
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void getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const SK_OVERRIDE;
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bool invertCoverage() const { return fInvertCoverage; }
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private:
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GrCoverageSetOpXP(SkRegion::Op regionOp, bool fInvertCoverage);
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bool onIsEqual(const GrXferProcessor& xpBase) const SK_OVERRIDE {
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const GrCoverageSetOpXP& xp = xpBase.cast<GrCoverageSetOpXP>();
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return (fRegionOp == xp.fRegionOp &&
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fInvertCoverage == xp.fInvertCoverage);
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}
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SkRegion::Op fRegionOp;
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bool fInvertCoverage;
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typedef GrXferProcessor INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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class GrCoverageSetOpXPFactory : public GrXPFactory {
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public:
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static GrXPFactory* Create(SkRegion::Op regionOp, bool invertCoverage = false);
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GrXferProcessor* createXferProcessor(const GrProcOptInfo& colorPOI,
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const GrProcOptInfo& coveragePOI) const SK_OVERRIDE;
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bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE {
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return true;
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}
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bool canApplyCoverage(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
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bool colorWriteDisabled) const SK_OVERRIDE {
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return true;
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}
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bool canTweakAlphaForCoverage() const SK_OVERRIDE { return false; }
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2014-12-18 20:44:55 +00:00
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void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
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bool colorWriteDisabled,
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GrXPFactory::InvariantOutput*) const SK_OVERRIDE;
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2014-12-17 21:37:13 +00:00
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private:
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GrCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage);
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bool onIsEqual(const GrXPFactory& xpfBase) const SK_OVERRIDE {
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const GrCoverageSetOpXPFactory& xpf = xpfBase.cast<GrCoverageSetOpXPFactory>();
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return fRegionOp == xpf.fRegionOp;
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}
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GR_DECLARE_XP_FACTORY_TEST;
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SkRegion::Op fRegionOp;
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bool fInvertCoverage;
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typedef GrXPFactory INHERITED;
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};
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#endif
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