tools/debugger/SkOverdrawMode.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkColorPriv.h"
 #include "SkOverdrawMode.h"
 #include "SkString.h"
 #include "SkXfermode.h"

 #if SK_SUPPORT_GPU
 #include "GrFragmentProcessor.h"
 #include "GrInvariantOutput.h"
 #include "GrXferProcessor.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLXferProcessor.h"

  ///////////////////////////////////////////////////////////////////////////////
  // Fragment Processor
  ///////////////////////////////////////////////////////////////////////////////

 class GLOverdrawFP;

 class GrOverdrawFP : public GrFragmentProcessor {
 public:
     static sk_sp<GrFragmentProcessor> Make(sk_sp<GrFragmentProcessor> dst) {
         return sk_sp<GrFragmentProcessor>(new GrOverdrawFP(std::move(dst)));
     }

     ~GrOverdrawFP() override { }

     const char* name() const override { return "Overdraw"; }

     SkString dumpInfo() const override {
         SkString str;
         return str;
     }

 private:
     GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;

     void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder* b) const override;

     bool onIsEqual(const GrFragmentProcessor&) const override { return true; }

     void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
         inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
     }

     GrOverdrawFP(sk_sp<GrFragmentProcessor> dst) {
         this->initClassID<GrOverdrawFP>();

         SkASSERT(dst);
         SkDEBUGCODE(int dstIndex = )this->registerChildProcessor(std::move(dst));
         SkASSERT(0 == dstIndex);
     }

     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
     typedef GrFragmentProcessor INHERITED;
 };

 ///////////////////////////////////////////////////////////////////////////////

 static void add_overdraw_code(GrGLSLFragmentBuilder* fragBuilder,
                               const char* dstColor,
                               const char* outputColor) {

     static const GrGLSLShaderVar gColorTableArgs[] = {
         // TODO: once kInt_GrSLType lands - switch this over
         GrGLSLShaderVar("index", kFloat_GrSLType),
     };
     SkString colorTableFuncName;

     // The 'colorTable' function exists to work around older GLSL's prohibition
     // of initialized arrays. It takes an integer index and just returns the
     // corresponding color.
    fragBuilder->emitFunction(kVec4f_GrSLType,
                              "colorTable",
                              SK_ARRAY_COUNT(gColorTableArgs),
                              gColorTableArgs,
                              "if (index < 1.5) { return vec4(0.5,   0.617, 1.0,   1.0); }"
                              "if (index < 2.5) { return vec4(0.664, 0.723, 0.83,  1.0); }"
                              "if (index < 3.5) { return vec4(0.832, 0.762, 0.664, 1.0); }"
                              "if (index < 4.5) { return vec4(1,     0.75,  0.496, 1.0); }"
                              "if (index < 5.5) { return vec4(1,     0.723, 0.332, 1.0); }"
                              "if (index < 6.5) { return vec4(1,     0.645, 0.164, 1.0); }"
                              "if (index < 7.5) { return vec4(1,     0.527, 0,     1.0); }"
                              "if (index < 8.5) { return vec4(1,     0.371, 0,     1.0); }"
                              "if (index < 9.5) { return vec4(1,     0.195, 0,     1.0); }"
                              "return vec4(1,     0,     0,     1.0);",
                              &colorTableFuncName);

     fragBuilder->codeAppend("int nextIdx;");
     fragBuilder->codeAppendf("vec4 dst = %s;", dstColor);
     fragBuilder->codeAppend("if (dst.r < 0.25) { nextIdx = 1; }");
     // cap 'idx' at 10
     fragBuilder->codeAppend("else if (dst.g < 0.0977) { nextIdx = 10; }");
     fragBuilder->codeAppend("else if (dst.b > 0.08) { nextIdx = 8 - int(6.0 * dst.b + 0.5); }");
     fragBuilder->codeAppend("else { nextIdx = 11 - int(5.7 * dst.g + 0.5); }");
     fragBuilder->codeAppendf("%s = %s(float(nextIdx));", outputColor, colorTableFuncName.c_str());
 }

 class GLOverdrawFP : public GrGLSLFragmentProcessor {
 public:
     void emitCode(EmitArgs& args) override {
         GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
         SkString dstColor("dstColor");
         this->emitChild(0, nullptr, &dstColor, args);

         add_overdraw_code(fragBuilder, dstColor.c_str(), args.fOutputColor);
     }

     static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) { }

 private:
     typedef GrGLSLFragmentProcessor INHERITED;
 };

 ///////////////////////////////////////////////////////////////////////////////

 GrGLSLFragmentProcessor* GrOverdrawFP::onCreateGLSLInstance() const {
     return new GLOverdrawFP;
 }

 void GrOverdrawFP::onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
     GLOverdrawFP::GenKey(*this, caps, b);
 }

 sk_sp<GrFragmentProcessor> GrOverdrawFP::TestCreate(GrProcessorTestData* d) {
     return GrOverdrawFP::Make(GrProcessorUnitTest::MakeChildFP(d));
 }

 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrOverdrawFP);

 ///////////////////////////////////////////////////////////////////////////////
 // Xfer Processor
 ///////////////////////////////////////////////////////////////////////////////

 class OverdrawXP : public GrXferProcessor {
 public:
     OverdrawXP(const DstTexture* dstTexture, bool hasMixedSamples)
         : INHERITED(dstTexture, true, hasMixedSamples) {
         this->initClassID<OverdrawXP>();
     }

     const char* name() const override { return "Overdraw"; }

     GrGLSLXferProcessor* createGLSLInstance() const override;

 private:
     GrXferProcessor::OptFlags onGetOptimizations(const GrPipelineOptimizations& optimizations,
                                                  bool doesStencilWrite,
                                                  GrColor* overrideColor,
                                                  const GrCaps& caps) const override {
         // We never look at the color input
         return GrXferProcessor::kIgnoreColor_OptFlag;
     }

     void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;

     bool onIsEqual(const GrXferProcessor&) const override { return true; }

     typedef GrXferProcessor INHERITED;
 };

 ///////////////////////////////////////////////////////////////////////////////

 class GLOverdrawXP : public GrGLSLXferProcessor {
 public:
     GLOverdrawXP(const OverdrawXP&) { }

     ~GLOverdrawXP() override {}

     static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) { }

 private:
     void emitBlendCodeForDstRead(GrGLSLXPFragmentBuilder* fragBuilder,
                                  GrGLSLUniformHandler* uniformHandler,
                                  const char* srcColor,
                                  const char* srcCoverage,
                                  const char* dstColor,
                                  const char* outColor,
                                  const char* outColorSecondary,
                                  const GrXferProcessor& proc) override {
         add_overdraw_code(fragBuilder, dstColor, outColor);

         // Apply coverage.
         INHERITED::DefaultCoverageModulation(fragBuilder, srcCoverage, dstColor, outColor,
                                              outColorSecondary, proc);
     }

     void onSetData(const GrGLSLProgramDataManager&, const GrXferProcessor&) override { };

     typedef GrGLSLXferProcessor INHERITED;
 };

 ///////////////////////////////////////////////////////////////////////////////

 void OverdrawXP::onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
     GLOverdrawXP::GenKey(*this, caps, b);
 }

 GrGLSLXferProcessor* OverdrawXP::createGLSLInstance() const { return new GLOverdrawXP(*this); }

 ///////////////////////////////////////////////////////////////////////////////
 class GrOverdrawXPFactory : public GrXPFactory {
 public:
     static sk_sp<GrXPFactory> Make() { return sk_sp<GrXPFactory>(new GrOverdrawXPFactory()); }

     void getInvariantBlendedColor(const GrProcOptInfo& colorPOI,
                                   GrXPFactory::InvariantBlendedColor* blendedColor) const override {
         blendedColor->fWillBlendWithDst = true;
         blendedColor->fKnownColorFlags = kNone_GrColorComponentFlags;
     }

 private:
     GrOverdrawXPFactory() {
         this->initClassID<GrOverdrawXPFactory>();
     }

     GrXferProcessor* onCreateXferProcessor(const GrCaps& caps,
                                            const GrPipelineOptimizations& optimizations,
                                            bool hasMixedSamples,
                                            const DstTexture* dstTexture) const override {
         return new OverdrawXP(dstTexture, hasMixedSamples);
     }

     bool onWillReadDstColor(const GrCaps&, const GrPipelineOptimizations&) const override {
         return true;
     }

     bool onIsEqual(const GrXPFactory& xpfBase) const override { return true; }

     GR_DECLARE_XP_FACTORY_TEST;

     typedef GrXPFactory INHERITED;
 };

 GR_DEFINE_XP_FACTORY_TEST(GrOverdrawXPFactory);

 sk_sp<GrXPFactory> GrOverdrawXPFactory::TestCreate(GrProcessorTestData* d) {
     return GrOverdrawXPFactory::Make();
 }
 #endif

 ///////////////////////////////////////////////////////////////////////////////
 class SkOverdrawXfermode : public SkXfermode {
 public:
     static SkXfermode* Create() {
         return new SkOverdrawXfermode;
     }

     SkPMColor xferColor(SkPMColor src, SkPMColor dst) const override {
         // This table encodes the color progression of the overdraw visualization
         static const SkPMColor gTable[] = {
             SkPackARGB32(0x00, 0x00, 0x00, 0x00),
             SkPackARGB32(0xFF, 128, 158, 255),
             SkPackARGB32(0xFF, 170, 185, 212),
             SkPackARGB32(0xFF, 213, 195, 170),
             SkPackARGB32(0xFF, 255, 192, 127),
             SkPackARGB32(0xFF, 255, 185, 85),
             SkPackARGB32(0xFF, 255, 165, 42),
             SkPackARGB32(0xFF, 255, 135, 0),
             SkPackARGB32(0xFF, 255,  95, 0),
             SkPackARGB32(0xFF, 255,  50, 0),
             SkPackARGB32(0xFF, 255,  0, 0)
         };


         int nextIdx;
         if (SkColorGetR(dst) < 64) { // dst color is the 0th color so the next color is 1
             nextIdx = 1;
         } else if (SkColorGetG(dst) < 25) { // dst color is the 10th color so cap there
             nextIdx = 10;
         } else if ((SkColorGetB(dst)+21)/42 > 0) { // dst color is one of 1-6
             nextIdx = 8 - (SkColorGetB(dst)+21)/42;
         } else { // dst color is between 7 and 9
             nextIdx = 11 - (SkColorGetG(dst)+22)/45;
         }
         SkASSERT(nextIdx < (int)SK_ARRAY_COUNT(gTable));

         return gTable[nextIdx];
     }

     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkOverdrawXfermode)

 #if SK_SUPPORT_GPU
     sk_sp<GrFragmentProcessor> makeFragmentProcessorForImageFilter(
                                                 sk_sp<GrFragmentProcessor> dst) const override {
         return GrOverdrawFP::Make(dst);
     }

     sk_sp<GrXPFactory> asXPFactory() const override {
         return GrOverdrawXPFactory::Make();
     }
 #endif

 #ifndef SK_IGNORE_TO_STRING
     void toString(SkString* str) const override { str->set("SkOverdrawXfermode"); }
 #endif

 private:
     friend class SkOverdrawMode;

     void flatten(SkWriteBuffer& buffer) const override { }

     typedef SkXfermode INHERITED;
 };

 sk_sp<SkFlattenable> SkOverdrawXfermode::CreateProc(SkReadBuffer& buffer) {
     return sk_sp<SkFlattenable>(Create());
 }

 sk_sp<SkXfermode> SkOverdrawMode::Make() { return sk_make_sp<SkOverdrawXfermode>(); }

 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkOverdrawMode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkOverdrawXfermode)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
	/*
	* Copyright 2016 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkColorPriv.h"
	#include "SkOverdrawMode.h"
	#include "SkString.h"
	#include "SkXfermode.h"

	#if SK_SUPPORT_GPU
	#include "GrFragmentProcessor.h"
	#include "GrInvariantOutput.h"
	#include "GrXferProcessor.h"
	#include "glsl/GrGLSLFragmentProcessor.h"
	#include "glsl/GrGLSLFragmentShaderBuilder.h"
	#include "glsl/GrGLSLXferProcessor.h"

	///////////////////////////////////////////////////////////////////////////////
	// Fragment Processor
	///////////////////////////////////////////////////////////////////////////////

	class GLOverdrawFP;

	class GrOverdrawFP : public GrFragmentProcessor {
	public:
	static sk_sp<GrFragmentProcessor> Make(sk_sp<GrFragmentProcessor> dst) {
	return sk_sp<GrFragmentProcessor>(new GrOverdrawFP(std::move(dst)));
	}

	~GrOverdrawFP() override { }

	const char* name() const override { return "Overdraw"; }

	SkString dumpInfo() const override {
	SkString str;
	return str;
	}

	private:
	GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;

	void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder* b) const override;

	bool onIsEqual(const GrFragmentProcessor&) const override { return true; }

	void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
	inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
	}

	GrOverdrawFP(sk_sp<GrFragmentProcessor> dst) {
	this->initClassID<GrOverdrawFP>();

	SkASSERT(dst);
	SkDEBUGCODE(int dstIndex = )this->registerChildProcessor(std::move(dst));
	SkASSERT(0 == dstIndex);
	}

	GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
	typedef GrFragmentProcessor INHERITED;
	};

	///////////////////////////////////////////////////////////////////////////////

	static void add_overdraw_code(GrGLSLFragmentBuilder* fragBuilder,
	const char* dstColor,
	const char* outputColor) {

	static const GrGLSLShaderVar gColorTableArgs[] = {
	// TODO: once kInt_GrSLType lands - switch this over
	GrGLSLShaderVar("index", kFloat_GrSLType),
	};
	SkString colorTableFuncName;

	// The 'colorTable' function exists to work around older GLSL's prohibition
	// of initialized arrays. It takes an integer index and just returns the
	// corresponding color.
	fragBuilder->emitFunction(kVec4f_GrSLType,
	"colorTable",
	SK_ARRAY_COUNT(gColorTableArgs),
	gColorTableArgs,
	"if (index < 1.5) { return vec4(0.5, 0.617, 1.0, 1.0); }"
	"if (index < 2.5) { return vec4(0.664, 0.723, 0.83, 1.0); }"
	"if (index < 3.5) { return vec4(0.832, 0.762, 0.664, 1.0); }"
	"if (index < 4.5) { return vec4(1, 0.75, 0.496, 1.0); }"
	"if (index < 5.5) { return vec4(1, 0.723, 0.332, 1.0); }"
	"if (index < 6.5) { return vec4(1, 0.645, 0.164, 1.0); }"
	"if (index < 7.5) { return vec4(1, 0.527, 0, 1.0); }"
	"if (index < 8.5) { return vec4(1, 0.371, 0, 1.0); }"
	"if (index < 9.5) { return vec4(1, 0.195, 0, 1.0); }"
	"return vec4(1, 0, 0, 1.0);",
	&colorTableFuncName);

	fragBuilder->codeAppend("int nextIdx;");
	fragBuilder->codeAppendf("vec4 dst = %s;", dstColor);
	fragBuilder->codeAppend("if (dst.r < 0.25) { nextIdx = 1; }");
	// cap 'idx' at 10
	fragBuilder->codeAppend("else if (dst.g < 0.0977) { nextIdx = 10; }");
	fragBuilder->codeAppend("else if (dst.b > 0.08) { nextIdx = 8 - int(6.0 * dst.b + 0.5); }");
	fragBuilder->codeAppend("else { nextIdx = 11 - int(5.7 * dst.g + 0.5); }");
	fragBuilder->codeAppendf("%s = %s(float(nextIdx));", outputColor, colorTableFuncName.c_str());
	}

	class GLOverdrawFP : public GrGLSLFragmentProcessor {
	public:
	void emitCode(EmitArgs& args) override {
	GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
	SkString dstColor("dstColor");
	this->emitChild(0, nullptr, &dstColor, args);

	add_overdraw_code(fragBuilder, dstColor.c_str(), args.fOutputColor);
	}

	static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) { }

	private:
	typedef GrGLSLFragmentProcessor INHERITED;
	};

	///////////////////////////////////////////////////////////////////////////////

	GrGLSLFragmentProcessor* GrOverdrawFP::onCreateGLSLInstance() const {
	return new GLOverdrawFP;
	}

	void GrOverdrawFP::onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
	GLOverdrawFP::GenKey(*this, caps, b);
	}

	sk_sp<GrFragmentProcessor> GrOverdrawFP::TestCreate(GrProcessorTestData* d) {
	return GrOverdrawFP::Make(GrProcessorUnitTest::MakeChildFP(d));
	}

	GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrOverdrawFP);

	///////////////////////////////////////////////////////////////////////////////
	// Xfer Processor
	///////////////////////////////////////////////////////////////////////////////

	class OverdrawXP : public GrXferProcessor {
	public:
	OverdrawXP(const DstTexture* dstTexture, bool hasMixedSamples)
	: INHERITED(dstTexture, true, hasMixedSamples) {
	this->initClassID<OverdrawXP>();
	}

	const char* name() const override { return "Overdraw"; }

	GrGLSLXferProcessor* createGLSLInstance() const override;

	private:
	GrXferProcessor::OptFlags onGetOptimizations(const GrPipelineOptimizations& optimizations,
	bool doesStencilWrite,
	GrColor* overrideColor,
	const GrCaps& caps) const override {
	// We never look at the color input
	return GrXferProcessor::kIgnoreColor_OptFlag;
	}

	void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;

	bool onIsEqual(const GrXferProcessor&) const override { return true; }

	typedef GrXferProcessor INHERITED;
	};

	///////////////////////////////////////////////////////////////////////////////

	class GLOverdrawXP : public GrGLSLXferProcessor {
	public:
	GLOverdrawXP(const OverdrawXP&) { }

	~GLOverdrawXP() override {}

	static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) { }

	private:
	void emitBlendCodeForDstRead(GrGLSLXPFragmentBuilder* fragBuilder,
	GrGLSLUniformHandler* uniformHandler,
	const char* srcColor,
	const char* srcCoverage,
	const char* dstColor,
	const char* outColor,
	const char* outColorSecondary,
	const GrXferProcessor& proc) override {
	add_overdraw_code(fragBuilder, dstColor, outColor);

	// Apply coverage.
	INHERITED::DefaultCoverageModulation(fragBuilder, srcCoverage, dstColor, outColor,
	outColorSecondary, proc);
	}

	void onSetData(const GrGLSLProgramDataManager&, const GrXferProcessor&) override { };

	typedef GrGLSLXferProcessor INHERITED;
	};

	///////////////////////////////////////////////////////////////////////////////

	void OverdrawXP::onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
	GLOverdrawXP::GenKey(*this, caps, b);
	}

	GrGLSLXferProcessor* OverdrawXP::createGLSLInstance() const { return new GLOverdrawXP(*this); }

	///////////////////////////////////////////////////////////////////////////////
	class GrOverdrawXPFactory : public GrXPFactory {
	public:
	static sk_sp<GrXPFactory> Make() { return sk_sp<GrXPFactory>(new GrOverdrawXPFactory()); }

	void getInvariantBlendedColor(const GrProcOptInfo& colorPOI,
	GrXPFactory::InvariantBlendedColor* blendedColor) const override {
	blendedColor->fWillBlendWithDst = true;
	blendedColor->fKnownColorFlags = kNone_GrColorComponentFlags;
	}

	private:
	GrOverdrawXPFactory() {
	this->initClassID<GrOverdrawXPFactory>();
	}

	GrXferProcessor* onCreateXferProcessor(const GrCaps& caps,
	const GrPipelineOptimizations& optimizations,
	bool hasMixedSamples,
	const DstTexture* dstTexture) const override {
	return new OverdrawXP(dstTexture, hasMixedSamples);
	}

	bool onWillReadDstColor(const GrCaps&, const GrPipelineOptimizations&) const override {
	return true;
	}

	bool onIsEqual(const GrXPFactory& xpfBase) const override { return true; }

	GR_DECLARE_XP_FACTORY_TEST;

	typedef GrXPFactory INHERITED;
	};

	GR_DEFINE_XP_FACTORY_TEST(GrOverdrawXPFactory);

	sk_sp<GrXPFactory> GrOverdrawXPFactory::TestCreate(GrProcessorTestData* d) {
	return GrOverdrawXPFactory::Make();
	}
	#endif

	///////////////////////////////////////////////////////////////////////////////
	class SkOverdrawXfermode : public SkXfermode {
	public:
	static SkXfermode* Create() {
	return new SkOverdrawXfermode;
	}

	SkPMColor xferColor(SkPMColor src, SkPMColor dst) const override {
	// This table encodes the color progression of the overdraw visualization
	static const SkPMColor gTable[] = {
	SkPackARGB32(0x00, 0x00, 0x00, 0x00),
	SkPackARGB32(0xFF, 128, 158, 255),
	SkPackARGB32(0xFF, 170, 185, 212),
	SkPackARGB32(0xFF, 213, 195, 170),
	SkPackARGB32(0xFF, 255, 192, 127),
	SkPackARGB32(0xFF, 255, 185, 85),
	SkPackARGB32(0xFF, 255, 165, 42),
	SkPackARGB32(0xFF, 255, 135, 0),
	SkPackARGB32(0xFF, 255, 95, 0),
	SkPackARGB32(0xFF, 255, 50, 0),
	SkPackARGB32(0xFF, 255, 0, 0)
	};


	int nextIdx;
	if (SkColorGetR(dst) < 64) { // dst color is the 0th color so the next color is 1
	nextIdx = 1;
	} else if (SkColorGetG(dst) < 25) { // dst color is the 10th color so cap there
	nextIdx = 10;
	} else if ((SkColorGetB(dst)+21)/42 > 0) { // dst color is one of 1-6
	nextIdx = 8 - (SkColorGetB(dst)+21)/42;
	} else { // dst color is between 7 and 9
	nextIdx = 11 - (SkColorGetG(dst)+22)/45;
	}
	SkASSERT(nextIdx < (int)SK_ARRAY_COUNT(gTable));

	return gTable[nextIdx];
	}

	SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkOverdrawXfermode)

	#if SK_SUPPORT_GPU
	sk_sp<GrFragmentProcessor> makeFragmentProcessorForImageFilter(
	sk_sp<GrFragmentProcessor> dst) const override {
	return GrOverdrawFP::Make(dst);
	}

	sk_sp<GrXPFactory> asXPFactory() const override {
	return GrOverdrawXPFactory::Make();
	}
	#endif

	#ifndef SK_IGNORE_TO_STRING
	void toString(SkString* str) const override { str->set("SkOverdrawXfermode"); }
	#endif

	private:
	friend class SkOverdrawMode;

	void flatten(SkWriteBuffer& buffer) const override { }

	typedef SkXfermode INHERITED;
	};

	sk_sp<SkFlattenable> SkOverdrawXfermode::CreateProc(SkReadBuffer& buffer) {
	return sk_sp<SkFlattenable>(Create());
	}

	sk_sp<SkXfermode> SkOverdrawMode::Make() { return sk_make_sp<SkOverdrawXfermode>(); }

	SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkOverdrawMode)
	SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkOverdrawXfermode)
	SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END