src/gpu/effects/GrGaussianConvolutionFragmentProcessor.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "GrGaussianConvolutionFragmentProcessor.h"

 #include "GrTexture.h"
 #include "GrTextureProxy.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
 #include "glsl/GrGLSLUniformHandler.h"

 // For brevity
 using UniformHandle = GrGLSLProgramDataManager::UniformHandle;
 using Direction = GrGaussianConvolutionFragmentProcessor::Direction;

 class GrGLConvolutionEffect : public GrGLSLFragmentProcessor {
 public:
     void emitCode(EmitArgs&) override;

     static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*);

 protected:
     void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override;

 private:
     UniformHandle fKernelUni;
     UniformHandle fImageIncrementUni;
     UniformHandle fBoundsUni;

     typedef GrGLSLFragmentProcessor INHERITED;
 };

 void GrGLConvolutionEffect::emitCode(EmitArgs& args) {
     const GrGaussianConvolutionFragmentProcessor& ce =
             args.fFp.cast<GrGaussianConvolutionFragmentProcessor>();

     GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
     fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
                                                     "ImageIncrement");
     if (ce.useBounds()) {
         fBoundsUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
                                                 "Bounds");
     }

     int width = ce.width();

     int arrayCount = (width + 3) / 4;
     SkASSERT(4 * arrayCount >= width);

     fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag, kHalf4_GrSLType,
                                                  "Kernel", arrayCount);

     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);

     fragBuilder->codeAppendf("%s = half4(0, 0, 0, 0);", args.fOutputColor);

     const GrShaderVar& kernel = uniformHandler->getUniformVariable(fKernelUni);
     const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);

     fragBuilder->codeAppendf("float2 coord = %s - %d.0 * %s;", coords2D.c_str(), ce.radius(), imgInc);
     fragBuilder->codeAppend("float2 coordSampled = half2(0, 0);");

     // Manually unroll loop because some drivers don't; yields 20-30% speedup.
     const char* kVecSuffix[4] = {".x", ".y", ".z", ".w"};
     for (int i = 0; i < width; i++) {
         SkString index;
         SkString kernelIndex;
         index.appendS32(i / 4);
         kernel.appendArrayAccess(index.c_str(), &kernelIndex);
         kernelIndex.append(kVecSuffix[i & 0x3]);

         fragBuilder->codeAppend("coordSampled = coord;");
         if (ce.useBounds()) {
             // We used to compute a bool indicating whether we're in bounds or not, cast it to a
             // float, and then mul weight*texture_sample by the float. However, the Adreno 430 seems
             // to have a bug that caused corruption.
             const char* bounds = uniformHandler->getUniformCStr(fBoundsUni);
             const char* component = ce.direction() == Direction::kY ? "y" : "x";

             switch (ce.mode()) {
                 case GrTextureDomain::kClamp_Mode: {
                     fragBuilder->codeAppendf("coordSampled.%s = clamp(coord.%s, %s.x, %s.y);\n",
                                              component, component, bounds, bounds);
                     break;
                 }
                 case GrTextureDomain::kRepeat_Mode: {
                     fragBuilder->codeAppendf("coordSampled.%s = "
                                              "mod(coord.%s - %s.x, %s.y - %s.x) + %s.x;\n",
                                              component, component, bounds, bounds, bounds, bounds);
                     break;
                 }
                 case GrTextureDomain::kDecal_Mode: {
                     fragBuilder->codeAppendf("if (coord.%s >= %s.x && coord.%s <= %s.y) {",
                                              component, bounds, component, bounds);
                     break;
                 }
                 default: {
                     SK_ABORT("Unsupported operation.");
                 }
             }
         }
         fragBuilder->codeAppendf("%s += ", args.fOutputColor);
         fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coordSampled");
         fragBuilder->codeAppendf(" * %s;\n", kernelIndex.c_str());
         if (GrTextureDomain::kDecal_Mode == ce.mode()) {
             fragBuilder->codeAppend("}");
         }
         fragBuilder->codeAppendf("coord += %s;\n", imgInc);
     }
     fragBuilder->codeAppendf("%s *= %s;\n", args.fOutputColor, args.fInputColor);
 }

 void GrGLConvolutionEffect::onSetData(const GrGLSLProgramDataManager& pdman,
                                       const GrFragmentProcessor& processor) {
     const GrGaussianConvolutionFragmentProcessor& conv =
             processor.cast<GrGaussianConvolutionFragmentProcessor>();
     GrSurfaceProxy* proxy = conv.textureSampler(0).proxy();
     GrTexture& texture = *proxy->peekTexture();

     float imageIncrement[2] = {0};
     float ySign = proxy->origin() != kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
     switch (conv.direction()) {
         case Direction::kX:
             imageIncrement[0] = 1.0f / texture.width();
             break;
         case Direction::kY:
             imageIncrement[1] = ySign / texture.height();
             break;
         default:
             SK_ABORT("Unknown filter direction.");
     }
     pdman.set2fv(fImageIncrementUni, 1, imageIncrement);
     if (conv.useBounds()) {
         float bounds[2] = {0};
         bounds[0] = conv.bounds()[0];
         bounds[1] = conv.bounds()[1];
         if (GrTextureDomain::kClamp_Mode == conv.mode()) {
             bounds[0] += SK_ScalarHalf;
             bounds[1] -= SK_ScalarHalf;
         }
         if (Direction::kX == conv.direction()) {
             SkScalar inv = SkScalarInvert(SkIntToScalar(texture.width()));
             bounds[0] *= inv;
             bounds[1] *= inv;
         } else {
             SkScalar inv = SkScalarInvert(SkIntToScalar(texture.height()));
             if (proxy->origin() != kTopLeft_GrSurfaceOrigin) {
                 float tmp = bounds[0];
                 bounds[0] = 1.0f - (inv * bounds[1]);
                 bounds[1] = 1.0f - (inv * tmp);
             } else {
                 bounds[0] *= inv;
                 bounds[1] *= inv;
             }
         }

         SkASSERT(bounds[0] <= bounds[1]);
         pdman.set2f(fBoundsUni, bounds[0], bounds[1]);
     }
     int width = conv.width();

     int arrayCount = (width + 3) / 4;
     SkASSERT(4 * arrayCount >= width);
     pdman.set4fv(fKernelUni, arrayCount, conv.kernel());
 }

 void GrGLConvolutionEffect::GenKey(const GrProcessor& processor, const GrShaderCaps&,
                                    GrProcessorKeyBuilder* b) {
     const GrGaussianConvolutionFragmentProcessor& conv =
             processor.cast<GrGaussianConvolutionFragmentProcessor>();
     uint32_t key = conv.radius();
     key <<= 3;
     key |= Direction::kY == conv.direction() ? 0x4 : 0x0;
     key |= static_cast<uint32_t>(conv.mode());
     b->add32(key);
 }

 ///////////////////////////////////////////////////////////////////////////////
 static void fill_in_1D_gaussian_kernel(float* kernel, int width, float gaussianSigma, int radius) {
     const float twoSigmaSqrd = 2.0f * gaussianSigma * gaussianSigma;
     if (SkScalarNearlyZero(twoSigmaSqrd, SK_ScalarNearlyZero)) {
         for (int i = 0; i < width; ++i) {
             kernel[i] = 0.0f;
         }
         return;
     }

     const float denom = 1.0f / twoSigmaSqrd;

     float sum = 0.0f;
     for (int i = 0; i < width; ++i) {
         float x = static_cast<float>(i - radius);
         // Note that the constant term (1/(sqrt(2*pi*sigma^2)) of the Gaussian
         // is dropped here, since we renormalize the kernel below.
         kernel[i] = sk_float_exp(-x * x * denom);
         sum += kernel[i];
     }
     // Normalize the kernel
     float scale = 1.0f / sum;
     for (int i = 0; i < width; ++i) {
         kernel[i] *= scale;
     }
 }

 GrGaussianConvolutionFragmentProcessor::GrGaussianConvolutionFragmentProcessor(
                                                             sk_sp<GrTextureProxy> proxy,
                                                             Direction direction,
                                                             int radius,
                                                             float gaussianSigma,
                                                             GrTextureDomain::Mode mode,
                                                             int bounds[2])
         : INHERITED(kGrGaussianConvolutionFragmentProcessor_ClassID,
                     ModulateByConfigOptimizationFlags(proxy->config()))
         , fCoordTransform(proxy.get())
         , fTextureSampler(std::move(proxy))
         , fRadius(radius)
         , fDirection(direction)
         , fMode(mode) {
     this->addCoordTransform(&fCoordTransform);
     this->setTextureSamplerCnt(1);
     SkASSERT(radius <= kMaxKernelRadius);

     fill_in_1D_gaussian_kernel(fKernel, this->width(), gaussianSigma, this->radius());

     memcpy(fBounds, bounds, sizeof(fBounds));
 }

 GrGaussianConvolutionFragmentProcessor::GrGaussianConvolutionFragmentProcessor(
         const GrGaussianConvolutionFragmentProcessor& that)
         : INHERITED(kGrGaussianConvolutionFragmentProcessor_ClassID, that.optimizationFlags())
         , fCoordTransform(that.fCoordTransform)
         , fTextureSampler(that.fTextureSampler)
         , fRadius(that.fRadius)
         , fDirection(that.fDirection)
         , fMode(that.fMode) {
     this->addCoordTransform(&fCoordTransform);
     this->setTextureSamplerCnt(1);
     memcpy(fKernel, that.fKernel, that.width() * sizeof(float));
     memcpy(fBounds, that.fBounds, sizeof(fBounds));
 }

 void GrGaussianConvolutionFragmentProcessor::onGetGLSLProcessorKey(const GrShaderCaps& caps,
                                                                    GrProcessorKeyBuilder* b) const {
     GrGLConvolutionEffect::GenKey(*this, caps, b);
 }

 GrGLSLFragmentProcessor* GrGaussianConvolutionFragmentProcessor::onCreateGLSLInstance() const {
     return new GrGLConvolutionEffect;
 }

 bool GrGaussianConvolutionFragmentProcessor::onIsEqual(const GrFragmentProcessor& sBase) const {
     const GrGaussianConvolutionFragmentProcessor& s =
             sBase.cast<GrGaussianConvolutionFragmentProcessor>();
     return (this->radius() == s.radius() && this->direction() == s.direction() &&
             this->mode() == s.mode() &&
             0 == memcmp(fBounds, s.fBounds, sizeof(fBounds)) &&
             0 == memcmp(fKernel, s.fKernel, this->width() * sizeof(float)));
 }

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

 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrGaussianConvolutionFragmentProcessor);

 #if GR_TEST_UTILS
 std::unique_ptr<GrFragmentProcessor> GrGaussianConvolutionFragmentProcessor::TestCreate(
         GrProcessorTestData* d) {
     int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx
                                         : GrProcessorUnitTest::kAlphaTextureIdx;
     sk_sp<GrTextureProxy> proxy = d->textureProxy(texIdx);

     int bounds[2];
     int modeIdx = d->fRandom->nextRangeU(0, GrTextureDomain::kModeCount-1);

     Direction dir;
     if (d->fRandom->nextBool()) {
         dir = Direction::kX;
         bounds[0] = d->fRandom->nextRangeU(0, proxy->width()-2);
         bounds[1] = d->fRandom->nextRangeU(bounds[0]+1, proxy->width()-1);
     } else {
         dir = Direction::kY;
         bounds[0] = d->fRandom->nextRangeU(0, proxy->height()-2);
         bounds[1] = d->fRandom->nextRangeU(bounds[0]+1, proxy->height()-1);
     }

     int radius = d->fRandom->nextRangeU(1, kMaxKernelRadius);
     float sigma = radius / 3.f;

     return GrGaussianConvolutionFragmentProcessor::Make(
             d->textureProxy(texIdx),
             dir, radius, sigma, static_cast<GrTextureDomain::Mode>(modeIdx), bounds);
 }
 #endif
	/*
	* Copyright 2012 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "GrGaussianConvolutionFragmentProcessor.h"

	#include "GrTexture.h"
	#include "GrTextureProxy.h"
	#include "glsl/GrGLSLFragmentProcessor.h"
	#include "glsl/GrGLSLFragmentShaderBuilder.h"
	#include "glsl/GrGLSLProgramDataManager.h"
	#include "glsl/GrGLSLUniformHandler.h"

	// For brevity
	using UniformHandle = GrGLSLProgramDataManager::UniformHandle;
	using Direction = GrGaussianConvolutionFragmentProcessor::Direction;

	class GrGLConvolutionEffect : public GrGLSLFragmentProcessor {
	public:
	void emitCode(EmitArgs&) override;

	static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*);

	protected:
	void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override;

	private:
	UniformHandle fKernelUni;
	UniformHandle fImageIncrementUni;
	UniformHandle fBoundsUni;

	typedef GrGLSLFragmentProcessor INHERITED;
	};

	void GrGLConvolutionEffect::emitCode(EmitArgs& args) {
	const GrGaussianConvolutionFragmentProcessor& ce =
	args.fFp.cast<GrGaussianConvolutionFragmentProcessor>();

	GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
	fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
	"ImageIncrement");
	if (ce.useBounds()) {
	fBoundsUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
	"Bounds");
	}

	int width = ce.width();

	int arrayCount = (width + 3) / 4;
	SkASSERT(4 * arrayCount >= width);

	fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag, kHalf4_GrSLType,
	"Kernel", arrayCount);

	GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
	SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);

	fragBuilder->codeAppendf("%s = half4(0, 0, 0, 0);", args.fOutputColor);

	const GrShaderVar& kernel = uniformHandler->getUniformVariable(fKernelUni);
	const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);

	fragBuilder->codeAppendf("float2 coord = %s - %d.0 * %s;", coords2D.c_str(), ce.radius(), imgInc);
	fragBuilder->codeAppend("float2 coordSampled = half2(0, 0);");

	// Manually unroll loop because some drivers don't; yields 20-30% speedup.
	const char* kVecSuffix[4] = {".x", ".y", ".z", ".w"};
	for (int i = 0; i < width; i++) {
	SkString index;
	SkString kernelIndex;
	index.appendS32(i / 4);
	kernel.appendArrayAccess(index.c_str(), &kernelIndex);
	kernelIndex.append(kVecSuffix[i & 0x3]);

	fragBuilder->codeAppend("coordSampled = coord;");
	if (ce.useBounds()) {
	// We used to compute a bool indicating whether we're in bounds or not, cast it to a
	// float, and then mul weight*texture_sample by the float. However, the Adreno 430 seems
	// to have a bug that caused corruption.
	const char* bounds = uniformHandler->getUniformCStr(fBoundsUni);
	const char* component = ce.direction() == Direction::kY ? "y" : "x";

	switch (ce.mode()) {
	case GrTextureDomain::kClamp_Mode: {
	fragBuilder->codeAppendf("coordSampled.%s = clamp(coord.%s, %s.x, %s.y);\n",
	component, component, bounds, bounds);
	break;
	}
	case GrTextureDomain::kRepeat_Mode: {
	fragBuilder->codeAppendf("coordSampled.%s = "
	"mod(coord.%s - %s.x, %s.y - %s.x) + %s.x;\n",
	component, component, bounds, bounds, bounds, bounds);
	break;
	}
	case GrTextureDomain::kDecal_Mode: {
	fragBuilder->codeAppendf("if (coord.%s >= %s.x && coord.%s <= %s.y) {",
	component, bounds, component, bounds);
	break;
	}
	default: {
	SK_ABORT("Unsupported operation.");
	}
	}
	}
	fragBuilder->codeAppendf("%s += ", args.fOutputColor);
	fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coordSampled");
	fragBuilder->codeAppendf(" * %s;\n", kernelIndex.c_str());
	if (GrTextureDomain::kDecal_Mode == ce.mode()) {
	fragBuilder->codeAppend("}");
	}
	fragBuilder->codeAppendf("coord += %s;\n", imgInc);
	}
	fragBuilder->codeAppendf("%s *= %s;\n", args.fOutputColor, args.fInputColor);
	}

	void GrGLConvolutionEffect::onSetData(const GrGLSLProgramDataManager& pdman,
	const GrFragmentProcessor& processor) {
	const GrGaussianConvolutionFragmentProcessor& conv =
	processor.cast<GrGaussianConvolutionFragmentProcessor>();
	GrSurfaceProxy* proxy = conv.textureSampler(0).proxy();
	GrTexture& texture = *proxy->peekTexture();

	float imageIncrement[2] = {0};
	float ySign = proxy->origin() != kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
	switch (conv.direction()) {
	case Direction::kX:
	imageIncrement[0] = 1.0f / texture.width();
	break;
	case Direction::kY:
	imageIncrement[1] = ySign / texture.height();
	break;
	default:
	SK_ABORT("Unknown filter direction.");
	}
	pdman.set2fv(fImageIncrementUni, 1, imageIncrement);
	if (conv.useBounds()) {
	float bounds[2] = {0};
	bounds[0] = conv.bounds()[0];
	bounds[1] = conv.bounds()[1];
	if (GrTextureDomain::kClamp_Mode == conv.mode()) {
	bounds[0] += SK_ScalarHalf;
	bounds[1] -= SK_ScalarHalf;
	}
	if (Direction::kX == conv.direction()) {
	SkScalar inv = SkScalarInvert(SkIntToScalar(texture.width()));
	bounds[0] *= inv;
	bounds[1] *= inv;
	} else {
	SkScalar inv = SkScalarInvert(SkIntToScalar(texture.height()));
	if (proxy->origin() != kTopLeft_GrSurfaceOrigin) {
	float tmp = bounds[0];
	bounds[0] = 1.0f - (inv * bounds[1]);
	bounds[1] = 1.0f - (inv * tmp);
	} else {
	bounds[0] *= inv;
	bounds[1] *= inv;
	}
	}

	SkASSERT(bounds[0] <= bounds[1]);
	pdman.set2f(fBoundsUni, bounds[0], bounds[1]);
	}
	int width = conv.width();

	int arrayCount = (width + 3) / 4;
	SkASSERT(4 * arrayCount >= width);
	pdman.set4fv(fKernelUni, arrayCount, conv.kernel());
	}

	void GrGLConvolutionEffect::GenKey(const GrProcessor& processor, const GrShaderCaps&,
	GrProcessorKeyBuilder* b) {
	const GrGaussianConvolutionFragmentProcessor& conv =
	processor.cast<GrGaussianConvolutionFragmentProcessor>();
	uint32_t key = conv.radius();
	key <<= 3;
	key \|= Direction::kY == conv.direction() ? 0x4 : 0x0;
	key \|= static_cast<uint32_t>(conv.mode());
	b->add32(key);
	}

	///////////////////////////////////////////////////////////////////////////////
	static void fill_in_1D_gaussian_kernel(float* kernel, int width, float gaussianSigma, int radius) {
	const float twoSigmaSqrd = 2.0f * gaussianSigma * gaussianSigma;
	if (SkScalarNearlyZero(twoSigmaSqrd, SK_ScalarNearlyZero)) {
	for (int i = 0; i < width; ++i) {
	kernel[i] = 0.0f;
	}
	return;
	}

	const float denom = 1.0f / twoSigmaSqrd;

	float sum = 0.0f;
	for (int i = 0; i < width; ++i) {
	float x = static_cast<float>(i - radius);
	// Note that the constant term (1/(sqrt(2pisigma^2)) of the Gaussian
	// is dropped here, since we renormalize the kernel below.
	kernel[i] = sk_float_exp(-x * x * denom);
	sum += kernel[i];
	}
	// Normalize the kernel
	float scale = 1.0f / sum;
	for (int i = 0; i < width; ++i) {
	kernel[i] *= scale;
	}
	}

	GrGaussianConvolutionFragmentProcessor::GrGaussianConvolutionFragmentProcessor(
	sk_sp<GrTextureProxy> proxy,
	Direction direction,
	int radius,
	float gaussianSigma,
	GrTextureDomain::Mode mode,
	int bounds[2])
	: INHERITED(kGrGaussianConvolutionFragmentProcessor_ClassID,
	ModulateByConfigOptimizationFlags(proxy->config()))
	, fCoordTransform(proxy.get())
	, fTextureSampler(std::move(proxy))
	, fRadius(radius)
	, fDirection(direction)
	, fMode(mode) {
	this->addCoordTransform(&fCoordTransform);
	this->setTextureSamplerCnt(1);
	SkASSERT(radius <= kMaxKernelRadius);

	fill_in_1D_gaussian_kernel(fKernel, this->width(), gaussianSigma, this->radius());

	memcpy(fBounds, bounds, sizeof(fBounds));
	}

	GrGaussianConvolutionFragmentProcessor::GrGaussianConvolutionFragmentProcessor(
	const GrGaussianConvolutionFragmentProcessor& that)
	: INHERITED(kGrGaussianConvolutionFragmentProcessor_ClassID, that.optimizationFlags())
	, fCoordTransform(that.fCoordTransform)
	, fTextureSampler(that.fTextureSampler)
	, fRadius(that.fRadius)
	, fDirection(that.fDirection)
	, fMode(that.fMode) {
	this->addCoordTransform(&fCoordTransform);
	this->setTextureSamplerCnt(1);
	memcpy(fKernel, that.fKernel, that.width() * sizeof(float));
	memcpy(fBounds, that.fBounds, sizeof(fBounds));
	}

	void GrGaussianConvolutionFragmentProcessor::onGetGLSLProcessorKey(const GrShaderCaps& caps,
	GrProcessorKeyBuilder* b) const {
	GrGLConvolutionEffect::GenKey(*this, caps, b);
	}

	GrGLSLFragmentProcessor* GrGaussianConvolutionFragmentProcessor::onCreateGLSLInstance() const {
	return new GrGLConvolutionEffect;
	}

	bool GrGaussianConvolutionFragmentProcessor::onIsEqual(const GrFragmentProcessor& sBase) const {
	const GrGaussianConvolutionFragmentProcessor& s =
	sBase.cast<GrGaussianConvolutionFragmentProcessor>();
	return (this->radius() == s.radius() && this->direction() == s.direction() &&
	this->mode() == s.mode() &&
	0 == memcmp(fBounds, s.fBounds, sizeof(fBounds)) &&
	0 == memcmp(fKernel, s.fKernel, this->width() * sizeof(float)));
	}

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

	GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrGaussianConvolutionFragmentProcessor);

	#if GR_TEST_UTILS
	std::unique_ptr<GrFragmentProcessor> GrGaussianConvolutionFragmentProcessor::TestCreate(
	GrProcessorTestData* d) {
	int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx
	: GrProcessorUnitTest::kAlphaTextureIdx;
	sk_sp<GrTextureProxy> proxy = d->textureProxy(texIdx);

	int bounds[2];
	int modeIdx = d->fRandom->nextRangeU(0, GrTextureDomain::kModeCount-1);

	Direction dir;
	if (d->fRandom->nextBool()) {
	dir = Direction::kX;
	bounds[0] = d->fRandom->nextRangeU(0, proxy->width()-2);
	bounds[1] = d->fRandom->nextRangeU(bounds[0]+1, proxy->width()-1);
	} else {
	dir = Direction::kY;
	bounds[0] = d->fRandom->nextRangeU(0, proxy->height()-2);
	bounds[1] = d->fRandom->nextRangeU(bounds[0]+1, proxy->height()-1);
	}

	int radius = d->fRandom->nextRangeU(1, kMaxKernelRadius);
	float sigma = radius / 3.f;

	return GrGaussianConvolutionFragmentProcessor::Make(
	d->textureProxy(texIdx),
	dir, radius, sigma, static_cast<GrTextureDomain::Mode>(modeIdx), bounds);
	}
	#endif