src/gpu/GrDefaultGeoProcFactory.cpp - skia - Git at Google

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "GrDefaultGeoProcFactory.h"

 #include "GrInvariantOutput.h"
 #include "SkRefCnt.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLGeometryProcessor.h"
 #include "glsl/GrGLSLVertexShaderBuilder.h"
 #include "glsl/GrGLSLVarying.h"
 #include "glsl/GrGLSLUniformHandler.h"
 #include "glsl/GrGLSLUtil.h"

 /*
  * The default Geometry Processor simply takes position and multiplies it by the uniform view
  * matrix. It also leaves coverage untouched.  Behind the scenes, we may add per vertex color or
  * local coords.
  */

 enum GPFlag {
     kColor_GPFlag =                 0x1,
     kLocalCoord_GPFlag =            0x2,
     kCoverage_GPFlag=               0x4,
 };

 class DefaultGeoProc : public GrGeometryProcessor {
 public:
     static sk_sp<GrGeometryProcessor> Make(uint32_t gpTypeFlags,
                                              GrColor color,
                                              const SkMatrix& viewMatrix,
                                              const SkMatrix& localMatrix,
                                              bool localCoordsWillBeRead,
                                              uint8_t coverage) {
         return sk_sp<GrGeometryProcessor>(new DefaultGeoProc(
                 gpTypeFlags, color, viewMatrix, localMatrix, coverage, localCoordsWillBeRead));
     }

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

     const Attribute* inPosition() const { return fInPosition; }
     const Attribute* inColor() const { return fInColor; }
     const Attribute* inLocalCoords() const { return fInLocalCoords; }
     const Attribute* inCoverage() const { return fInCoverage; }
     GrColor color() const { return fColor; }
     bool hasVertexColor() const { return SkToBool(fInColor); }
     const SkMatrix& viewMatrix() const { return fViewMatrix; }
     const SkMatrix& localMatrix() const { return fLocalMatrix; }
     bool localCoordsWillBeRead() const { return fLocalCoordsWillBeRead; }
     uint8_t coverage() const { return fCoverage; }
     bool hasVertexCoverage() const { return SkToBool(fInCoverage); }

     class GLSLProcessor : public GrGLSLGeometryProcessor {
     public:
         GLSLProcessor()
             : fViewMatrix(SkMatrix::InvalidMatrix()), fColor(GrColor_ILLEGAL), fCoverage(0xff) {}

         void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
             const DefaultGeoProc& gp = args.fGP.cast<DefaultGeoProc>();
             GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
             GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
             GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
             GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;

             // emit attributes
             varyingHandler->emitAttributes(gp);

             // Setup pass through color
             if (gp.hasVertexColor()) {
                 varyingHandler->addPassThroughAttribute(gp.inColor(), args.fOutputColor);
             } else {
                 this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor,
                                         &fColorUniform);
             }

             // Setup position
             this->setupPosition(vertBuilder,
                                 uniformHandler,
                                 gpArgs,
                                 gp.inPosition()->fName,
                                 gp.viewMatrix(),
                                 &fViewMatrixUniform);

             if (gp.hasExplicitLocalCoords()) {
                 // emit transforms with explicit local coords
                 this->emitTransforms(vertBuilder,
                                      varyingHandler,
                                      uniformHandler,
                                      gpArgs->fPositionVar,
                                      gp.inLocalCoords()->fName,
                                      gp.localMatrix(),
                                      args.fFPCoordTransformHandler);
             } else {
                 // emit transforms with position
                 this->emitTransforms(vertBuilder,
                                      varyingHandler,
                                      uniformHandler,
                                      gpArgs->fPositionVar,
                                      gp.inPosition()->fName,
                                      gp.localMatrix(),
                                      args.fFPCoordTransformHandler);
             }

             // Setup coverage as pass through
             if (gp.hasVertexCoverage()) {
                 fragBuilder->codeAppendf("float alpha = 1.0;");
                 varyingHandler->addPassThroughAttribute(gp.inCoverage(), "alpha");
                 fragBuilder->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage);
             } else if (gp.coverage() == 0xff) {
                 fragBuilder->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
             } else {
                 const char* fragCoverage;
                 fCoverageUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                               kFloat_GrSLType,
                                                               kDefault_GrSLPrecision,
                                                               "Coverage",
                                                               &fragCoverage);
                 fragBuilder->codeAppendf("%s = vec4(%s);", args.fOutputCoverage, fragCoverage);
             }
         }

         static inline void GenKey(const GrGeometryProcessor& gp,
                                   const GrShaderCaps&,
                                   GrProcessorKeyBuilder* b) {
             const DefaultGeoProc& def = gp.cast<DefaultGeoProc>();
             uint32_t key = def.fFlags;
             key |= def.hasVertexColor() << 8;
             key |= def.hasVertexCoverage() << 9;
             key |= (def.coverage() == 0xff) ? (0x1 << 10) : 0;
             key |= (def.localCoordsWillBeRead() && def.localMatrix().hasPerspective()) ? (0x1 << 24)
                                                                                        : 0x0;
             key |= ComputePosKey(def.viewMatrix()) << 25;
             b->add32(key);
         }

         void setData(const GrGLSLProgramDataManager& pdman,
                      const GrPrimitiveProcessor& gp,
                      FPCoordTransformIter&& transformIter) override {
             const DefaultGeoProc& dgp = gp.cast<DefaultGeoProc>();

             if (!dgp.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(dgp.viewMatrix())) {
                 fViewMatrix = dgp.viewMatrix();
                 float viewMatrix[3 * 3];
                 GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix);
                 pdman.setMatrix3f(fViewMatrixUniform, viewMatrix);
             }

             if (dgp.color() != fColor && !dgp.hasVertexColor()) {
                 float c[4];
                 GrColorToRGBAFloat(dgp.color(), c);
                 pdman.set4fv(fColorUniform, 1, c);
                 fColor = dgp.color();
             }

             if (dgp.coverage() != fCoverage && !dgp.hasVertexCoverage()) {
                 pdman.set1f(fCoverageUniform, GrNormalizeByteToFloat(dgp.coverage()));
                 fCoverage = dgp.coverage();
             }
             this->setTransformDataHelper(dgp.fLocalMatrix, pdman, &transformIter);
         }

     private:
         SkMatrix fViewMatrix;
         GrColor fColor;
         uint8_t fCoverage;
         UniformHandle fViewMatrixUniform;
         UniformHandle fColorUniform;
         UniformHandle fCoverageUniform;

         typedef GrGLSLGeometryProcessor INHERITED;
     };

     void getGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override {
         GLSLProcessor::GenKey(*this, caps, b);
     }

     GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override {
         return new GLSLProcessor();
     }

 private:
     DefaultGeoProc(uint32_t gpTypeFlags,
                    GrColor color,
                    const SkMatrix& viewMatrix,
                    const SkMatrix& localMatrix,
                    uint8_t coverage,
                    bool localCoordsWillBeRead)
             : fInPosition(nullptr)
             , fInColor(nullptr)
             , fInLocalCoords(nullptr)
             , fInCoverage(nullptr)
             , fColor(color)
             , fViewMatrix(viewMatrix)
             , fLocalMatrix(localMatrix)
             , fCoverage(coverage)
             , fFlags(gpTypeFlags)
             , fLocalCoordsWillBeRead(localCoordsWillBeRead) {
         this->initClassID<DefaultGeoProc>();
         bool hasColor = SkToBool(gpTypeFlags & kColor_GPFlag);
         bool hasExplicitLocalCoords = SkToBool(gpTypeFlags & kLocalCoord_GPFlag);
         bool hasCoverage = SkToBool(gpTypeFlags & kCoverage_GPFlag);
         fInPosition = &this->addVertexAttrib("inPosition", kVec2f_GrVertexAttribType,
                                              kHigh_GrSLPrecision);
         if (hasColor) {
             fInColor = &this->addVertexAttrib("inColor", kVec4ub_GrVertexAttribType);
         }
         if (hasExplicitLocalCoords) {
             fInLocalCoords = &this->addVertexAttrib("inLocalCoord", kVec2f_GrVertexAttribType,
                                                     kHigh_GrSLPrecision);
             this->setHasExplicitLocalCoords();
         }
         if (hasCoverage) {
             fInCoverage = &this->addVertexAttrib("inCoverage", kFloat_GrVertexAttribType);
         }
     }

     const Attribute* fInPosition;
     const Attribute* fInColor;
     const Attribute* fInLocalCoords;
     const Attribute* fInCoverage;
     GrColor fColor;
     SkMatrix fViewMatrix;
     SkMatrix fLocalMatrix;
     uint8_t fCoverage;
     uint32_t fFlags;
     bool fLocalCoordsWillBeRead;

     GR_DECLARE_GEOMETRY_PROCESSOR_TEST;

     typedef GrGeometryProcessor INHERITED;
 };

 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DefaultGeoProc);

 sk_sp<GrGeometryProcessor> DefaultGeoProc::TestCreate(GrProcessorTestData* d) {
     uint32_t flags = 0;
     if (d->fRandom->nextBool()) {
         flags |= kColor_GPFlag;
     }
     if (d->fRandom->nextBool()) {
         flags |= kCoverage_GPFlag;
     }
     if (d->fRandom->nextBool()) {
         flags |= kLocalCoord_GPFlag;
     }

     return DefaultGeoProc::Make(flags,
                                 GrRandomColor(d->fRandom),
                                 GrTest::TestMatrix(d->fRandom),
                                 GrTest::TestMatrix(d->fRandom),
                                 d->fRandom->nextBool(),
                                 GrRandomCoverage(d->fRandom));
 }

 sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::Make(const Color& color,
                                                          const Coverage& coverage,
                                                          const LocalCoords& localCoords,
                                                          const SkMatrix& viewMatrix) {
     uint32_t flags = 0;
     flags |= color.fType == Color::kAttribute_Type ? kColor_GPFlag : 0;
     flags |= coverage.fType == Coverage::kAttribute_Type ? kCoverage_GPFlag : 0;
     flags |= localCoords.fType == LocalCoords::kHasExplicit_Type ? kLocalCoord_GPFlag : 0;

     uint8_t inCoverage = coverage.fCoverage;
     bool localCoordsWillBeRead = localCoords.fType != LocalCoords::kUnused_Type;

     GrColor inColor = color.fColor;
     return DefaultGeoProc::Make(flags,
                                 inColor,
                                 viewMatrix,
                                 localCoords.fMatrix ? *localCoords.fMatrix : SkMatrix::I(),
                                 localCoordsWillBeRead,
                                 inCoverage);
 }

 sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::MakeForDeviceSpace(
                                                                      const Color& color,
                                                                      const Coverage& coverage,
                                                                      const LocalCoords& localCoords,
                                                                      const SkMatrix& viewMatrix) {
     SkMatrix invert = SkMatrix::I();
     if (LocalCoords::kUnused_Type != localCoords.fType) {
         SkASSERT(LocalCoords::kUsePosition_Type == localCoords.fType);
         if (!viewMatrix.isIdentity() && !viewMatrix.invert(&invert)) {
             SkDebugf("Could not invert\n");
             return nullptr;
         }

         if (localCoords.hasLocalMatrix()) {
             invert.preConcat(*localCoords.fMatrix);
         }
     }

     LocalCoords inverted(LocalCoords::kUsePosition_Type, &invert);
     return Make(color, coverage, inverted, SkMatrix::I());
 }
	/*
	* Copyright 2014 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "GrDefaultGeoProcFactory.h"

	#include "GrInvariantOutput.h"
	#include "SkRefCnt.h"
	#include "glsl/GrGLSLFragmentShaderBuilder.h"
	#include "glsl/GrGLSLGeometryProcessor.h"
	#include "glsl/GrGLSLVertexShaderBuilder.h"
	#include "glsl/GrGLSLVarying.h"
	#include "glsl/GrGLSLUniformHandler.h"
	#include "glsl/GrGLSLUtil.h"

	/*
	* The default Geometry Processor simply takes position and multiplies it by the uniform view
	* matrix. It also leaves coverage untouched. Behind the scenes, we may add per vertex color or
	* local coords.
	*/

	enum GPFlag {
	kColor_GPFlag = 0x1,
	kLocalCoord_GPFlag = 0x2,
	kCoverage_GPFlag= 0x4,
	};

	class DefaultGeoProc : public GrGeometryProcessor {
	public:
	static sk_sp<GrGeometryProcessor> Make(uint32_t gpTypeFlags,
	GrColor color,
	const SkMatrix& viewMatrix,
	const SkMatrix& localMatrix,
	bool localCoordsWillBeRead,
	uint8_t coverage) {
	return sk_sp<GrGeometryProcessor>(new DefaultGeoProc(
	gpTypeFlags, color, viewMatrix, localMatrix, coverage, localCoordsWillBeRead));
	}

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

	const Attribute* inPosition() const { return fInPosition; }
	const Attribute* inColor() const { return fInColor; }
	const Attribute* inLocalCoords() const { return fInLocalCoords; }
	const Attribute* inCoverage() const { return fInCoverage; }
	GrColor color() const { return fColor; }
	bool hasVertexColor() const { return SkToBool(fInColor); }
	const SkMatrix& viewMatrix() const { return fViewMatrix; }
	const SkMatrix& localMatrix() const { return fLocalMatrix; }
	bool localCoordsWillBeRead() const { return fLocalCoordsWillBeRead; }
	uint8_t coverage() const { return fCoverage; }
	bool hasVertexCoverage() const { return SkToBool(fInCoverage); }

	class GLSLProcessor : public GrGLSLGeometryProcessor {
	public:
	GLSLProcessor()
	: fViewMatrix(SkMatrix::InvalidMatrix()), fColor(GrColor_ILLEGAL), fCoverage(0xff) {}

	void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
	const DefaultGeoProc& gp = args.fGP.cast<DefaultGeoProc>();
	GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
	GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
	GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
	GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;

	// emit attributes
	varyingHandler->emitAttributes(gp);

	// Setup pass through color
	if (gp.hasVertexColor()) {
	varyingHandler->addPassThroughAttribute(gp.inColor(), args.fOutputColor);
	} else {
	this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor,
	&fColorUniform);
	}

	// Setup position
	this->setupPosition(vertBuilder,
	uniformHandler,
	gpArgs,
	gp.inPosition()->fName,
	gp.viewMatrix(),
	&fViewMatrixUniform);

	if (gp.hasExplicitLocalCoords()) {
	// emit transforms with explicit local coords
	this->emitTransforms(vertBuilder,
	varyingHandler,
	uniformHandler,
	gpArgs->fPositionVar,
	gp.inLocalCoords()->fName,
	gp.localMatrix(),
	args.fFPCoordTransformHandler);
	} else {
	// emit transforms with position
	this->emitTransforms(vertBuilder,
	varyingHandler,
	uniformHandler,
	gpArgs->fPositionVar,
	gp.inPosition()->fName,
	gp.localMatrix(),
	args.fFPCoordTransformHandler);
	}

	// Setup coverage as pass through
	if (gp.hasVertexCoverage()) {
	fragBuilder->codeAppendf("float alpha = 1.0;");
	varyingHandler->addPassThroughAttribute(gp.inCoverage(), "alpha");
	fragBuilder->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage);
	} else if (gp.coverage() == 0xff) {
	fragBuilder->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
	} else {
	const char* fragCoverage;
	fCoverageUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
	kFloat_GrSLType,
	kDefault_GrSLPrecision,
	"Coverage",
	&fragCoverage);
	fragBuilder->codeAppendf("%s = vec4(%s);", args.fOutputCoverage, fragCoverage);
	}
	}

	static inline void GenKey(const GrGeometryProcessor& gp,
	const GrShaderCaps&,
	GrProcessorKeyBuilder* b) {
	const DefaultGeoProc& def = gp.cast<DefaultGeoProc>();
	uint32_t key = def.fFlags;
	key \|= def.hasVertexColor() << 8;
	key \|= def.hasVertexCoverage() << 9;
	key \|= (def.coverage() == 0xff) ? (0x1 << 10) : 0;
	key \|= (def.localCoordsWillBeRead() && def.localMatrix().hasPerspective()) ? (0x1 << 24)
	: 0x0;
	key \|= ComputePosKey(def.viewMatrix()) << 25;
	b->add32(key);
	}

	void setData(const GrGLSLProgramDataManager& pdman,
	const GrPrimitiveProcessor& gp,
	FPCoordTransformIter&& transformIter) override {
	const DefaultGeoProc& dgp = gp.cast<DefaultGeoProc>();

	if (!dgp.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(dgp.viewMatrix())) {
	fViewMatrix = dgp.viewMatrix();
	float viewMatrix[3 * 3];
	GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix);
	pdman.setMatrix3f(fViewMatrixUniform, viewMatrix);
	}

	if (dgp.color() != fColor && !dgp.hasVertexColor()) {
	float c[4];
	GrColorToRGBAFloat(dgp.color(), c);
	pdman.set4fv(fColorUniform, 1, c);
	fColor = dgp.color();
	}

	if (dgp.coverage() != fCoverage && !dgp.hasVertexCoverage()) {
	pdman.set1f(fCoverageUniform, GrNormalizeByteToFloat(dgp.coverage()));
	fCoverage = dgp.coverage();
	}
	this->setTransformDataHelper(dgp.fLocalMatrix, pdman, &transformIter);
	}

	private:
	SkMatrix fViewMatrix;
	GrColor fColor;
	uint8_t fCoverage;
	UniformHandle fViewMatrixUniform;
	UniformHandle fColorUniform;
	UniformHandle fCoverageUniform;

	typedef GrGLSLGeometryProcessor INHERITED;
	};

	void getGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override {
	GLSLProcessor::GenKey(*this, caps, b);
	}

	GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override {
	return new GLSLProcessor();
	}

	private:
	DefaultGeoProc(uint32_t gpTypeFlags,
	GrColor color,
	const SkMatrix& viewMatrix,
	const SkMatrix& localMatrix,
	uint8_t coverage,
	bool localCoordsWillBeRead)
	: fInPosition(nullptr)
	, fInColor(nullptr)
	, fInLocalCoords(nullptr)
	, fInCoverage(nullptr)
	, fColor(color)
	, fViewMatrix(viewMatrix)
	, fLocalMatrix(localMatrix)
	, fCoverage(coverage)
	, fFlags(gpTypeFlags)
	, fLocalCoordsWillBeRead(localCoordsWillBeRead) {
	this->initClassID<DefaultGeoProc>();
	bool hasColor = SkToBool(gpTypeFlags & kColor_GPFlag);
	bool hasExplicitLocalCoords = SkToBool(gpTypeFlags & kLocalCoord_GPFlag);
	bool hasCoverage = SkToBool(gpTypeFlags & kCoverage_GPFlag);
	fInPosition = &this->addVertexAttrib("inPosition", kVec2f_GrVertexAttribType,
	kHigh_GrSLPrecision);
	if (hasColor) {
	fInColor = &this->addVertexAttrib("inColor", kVec4ub_GrVertexAttribType);
	}
	if (hasExplicitLocalCoords) {
	fInLocalCoords = &this->addVertexAttrib("inLocalCoord", kVec2f_GrVertexAttribType,
	kHigh_GrSLPrecision);
	this->setHasExplicitLocalCoords();
	}
	if (hasCoverage) {
	fInCoverage = &this->addVertexAttrib("inCoverage", kFloat_GrVertexAttribType);
	}
	}

	const Attribute* fInPosition;
	const Attribute* fInColor;
	const Attribute* fInLocalCoords;
	const Attribute* fInCoverage;
	GrColor fColor;
	SkMatrix fViewMatrix;
	SkMatrix fLocalMatrix;
	uint8_t fCoverage;
	uint32_t fFlags;
	bool fLocalCoordsWillBeRead;

	GR_DECLARE_GEOMETRY_PROCESSOR_TEST;

	typedef GrGeometryProcessor INHERITED;
	};

	GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DefaultGeoProc);

	sk_sp<GrGeometryProcessor> DefaultGeoProc::TestCreate(GrProcessorTestData* d) {
	uint32_t flags = 0;
	if (d->fRandom->nextBool()) {
	flags \|= kColor_GPFlag;
	}
	if (d->fRandom->nextBool()) {
	flags \|= kCoverage_GPFlag;
	}
	if (d->fRandom->nextBool()) {
	flags \|= kLocalCoord_GPFlag;
	}

	return DefaultGeoProc::Make(flags,
	GrRandomColor(d->fRandom),
	GrTest::TestMatrix(d->fRandom),
	GrTest::TestMatrix(d->fRandom),
	d->fRandom->nextBool(),
	GrRandomCoverage(d->fRandom));
	}

	sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::Make(const Color& color,
	const Coverage& coverage,
	const LocalCoords& localCoords,
	const SkMatrix& viewMatrix) {
	uint32_t flags = 0;
	flags \|= color.fType == Color::kAttribute_Type ? kColor_GPFlag : 0;
	flags \|= coverage.fType == Coverage::kAttribute_Type ? kCoverage_GPFlag : 0;
	flags \|= localCoords.fType == LocalCoords::kHasExplicit_Type ? kLocalCoord_GPFlag : 0;

	uint8_t inCoverage = coverage.fCoverage;
	bool localCoordsWillBeRead = localCoords.fType != LocalCoords::kUnused_Type;

	GrColor inColor = color.fColor;
	return DefaultGeoProc::Make(flags,
	inColor,
	viewMatrix,
	localCoords.fMatrix ? *localCoords.fMatrix : SkMatrix::I(),
	localCoordsWillBeRead,
	inCoverage);
	}

	sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::MakeForDeviceSpace(
	const Color& color,
	const Coverage& coverage,
	const LocalCoords& localCoords,
	const SkMatrix& viewMatrix) {
	SkMatrix invert = SkMatrix::I();
	if (LocalCoords::kUnused_Type != localCoords.fType) {
	SkASSERT(LocalCoords::kUsePosition_Type == localCoords.fType);
	if (!viewMatrix.isIdentity() && !viewMatrix.invert(&invert)) {
	SkDebugf("Could not invert\n");
	return nullptr;
	}

	if (localCoords.hasLocalMatrix()) {
	invert.preConcat(*localCoords.fMatrix);
	}
	}

	LocalCoords inverted(LocalCoords::kUsePosition_Type, &invert);
	return Make(color, coverage, inverted, SkMatrix::I());
	}