third_party/skia/tests/TestUtils.cpp - cobalt - Git at Google

 /*
  * Copyright 2017 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "tests/TestUtils.h"

 #include "include/encode/SkPngEncoder.h"
 #include "include/utils/SkBase64.h"
 #include "src/core/SkUtils.h"
 #include "src/gpu/GrContextPriv.h"
 #include "src/gpu/GrDrawingManager.h"
 #include "src/gpu/GrGpu.h"
 #include "src/gpu/GrImageInfo.h"
 #include "src/gpu/GrSurfaceContext.h"
 #include "src/gpu/GrSurfaceProxy.h"
 #include "src/gpu/GrTextureContext.h"
 #include "src/gpu/GrTextureProxy.h"
 #include "src/gpu/SkGr.h"

 void TestReadPixels(skiatest::Reporter* reporter,
                     GrSurfaceContext* srcContext,
                     uint32_t expectedPixelValues[],
                     const char* testName) {
     int pixelCnt = srcContext->width() * srcContext->height();
     SkAutoTMalloc<uint32_t> pixels(pixelCnt);
     memset(pixels.get(), 0, sizeof(uint32_t)*pixelCnt);

     SkImageInfo ii = SkImageInfo::Make(srcContext->width(), srcContext->height(),
                                        kRGBA_8888_SkColorType, kPremul_SkAlphaType);
     bool read = srcContext->readPixels(ii, pixels.get(), 0, {0, 0});
     if (!read) {
         ERRORF(reporter, "%s: Error reading from texture.", testName);
     }

     for (int i = 0; i < pixelCnt; ++i) {
         if (pixels.get()[i] != expectedPixelValues[i]) {
             ERRORF(reporter, "%s: Error, pixel value %d should be 0x%08x, got 0x%08x.",
                    testName, i, expectedPixelValues[i], pixels.get()[i]);
             break;
         }
     }
 }

 void TestWritePixels(skiatest::Reporter* reporter,
                      GrSurfaceContext* dstContext,
                      bool expectedToWork,
                      const char* testName) {
     int pixelCnt = dstContext->width() * dstContext->height();
     SkAutoTMalloc<uint32_t> pixels(pixelCnt);
     for (int y = 0; y < dstContext->width(); ++y) {
         for (int x = 0; x < dstContext->height(); ++x) {
             pixels.get()[y * dstContext->width() + x] =
                 SkColorToPremulGrColor(SkColorSetARGB(2*y, x, y, x + y));
         }
     }

     SkImageInfo ii = SkImageInfo::Make(dstContext->width(), dstContext->height(),
                                        kRGBA_8888_SkColorType, kPremul_SkAlphaType);
     bool write = dstContext->writePixels(ii, pixels.get(), 0, {0, 0});
     if (!write) {
         if (expectedToWork) {
             ERRORF(reporter, "%s: Error writing to texture.", testName);
         }
         return;
     }

     if (write && !expectedToWork) {
         ERRORF(reporter, "%s: writePixels succeeded when it wasn't supposed to.", testName);
         return;
     }

     TestReadPixels(reporter, dstContext, pixels.get(), testName);
 }

 void TestCopyFromSurface(skiatest::Reporter* reporter,
                          GrContext* context,
                          GrSurfaceProxy* proxy,
                          GrColorType colorType,
                          uint32_t expectedPixelValues[],
                          const char* testName) {
     sk_sp<GrTextureProxy> dstProxy = GrSurfaceProxy::Copy(context, proxy, GrMipMapped::kNo,
                                                           SkBackingFit::kExact, SkBudgeted::kYes);
     SkASSERT(dstProxy);

     auto dstContext = context->priv().makeWrappedSurfaceContext(std::move(dstProxy), colorType,
                                                                 kPremul_SkAlphaType);
     SkASSERT(dstContext);

     TestReadPixels(reporter, dstContext.get(), expectedPixelValues, testName);
 }

 void FillPixelData(int width, int height, GrColor* data) {
     for (int j = 0; j < height; ++j) {
         for (int i = 0; i < width; ++i) {
             unsigned int red = (unsigned int)(256.f * (i / (float)width));
             unsigned int green = (unsigned int)(256.f * (j / (float)height));
             data[i + j * width] = GrColorPackRGBA(red - (red >> 8), green - (green >> 8),
                                                   0xff, 0xff);
         }
     }
 }

 bool CreateBackendTexture(GrContext* context,
                           GrBackendTexture* backendTex,
                           const SkImageInfo& ii,
                           const SkColor4f& color,
                           GrMipMapped mipMapped,
                           GrRenderable renderable) {
     *backendTex = context->createBackendTexture(ii.width(), ii.height(), ii.colorType(),
                                                 color, mipMapped, renderable);
     return backendTex->isValid();
 }

 void DeleteBackendTexture(GrContext* context, const GrBackendTexture& backendTex) {
     GrFlushInfo flushInfo;
     flushInfo.fFlags = kSyncCpu_GrFlushFlag;
     context->flush(flushInfo);
     context->deleteBackendTexture(backendTex);
 }

 bool DoesFullBufferContainCorrectColor(const GrColor* srcBuffer,
                                        const GrColor* dstBuffer,
                                        int width, int height) {
     const GrColor* srcPtr = srcBuffer;
     const GrColor* dstPtr = dstBuffer;
     for (int j = 0; j < height; ++j) {
         for (int i = 0; i < width; ++i) {
             if (srcPtr[i] != dstPtr[i]) {
                 return false;
             }
         }
         srcPtr += width;
         dstPtr += width;
     }
     return true;
 }

 bool BipmapToBase64DataURI(const SkBitmap& bitmap, SkString* dst) {
     SkPixmap pm;
     if (!bitmap.peekPixels(&pm)) {
         dst->set("peekPixels failed");
         return false;
     }

     // We're going to embed this PNG in a data URI, so make it as small as possible
     SkPngEncoder::Options options;
     options.fFilterFlags = SkPngEncoder::FilterFlag::kAll;
     options.fZLibLevel = 9;

     SkDynamicMemoryWStream wStream;
     if (!SkPngEncoder::Encode(&wStream, pm, options)) {
         dst->set("SkPngEncoder::Encode failed");
         return false;
     }

     sk_sp<SkData> pngData = wStream.detachAsData();
     size_t len = SkBase64::Encode(pngData->data(), pngData->size(), nullptr);

     // The PNG can be almost arbitrarily large. We don't want to fill our logs with enormous URLs.
     // Infra says these can be pretty big, as long as we're only outputting them on failure.
     static const size_t kMaxBase64Length = 1024 * 1024;
     if (len > kMaxBase64Length) {
         dst->printf("Encoded image too large (%u bytes)", static_cast<uint32_t>(len));
         return false;
     }

     dst->resize(len);
     SkBase64::Encode(pngData->data(), pngData->size(), dst->writable_str());
     dst->prepend("data:image/png;base64,");
     return true;
 }

 using AccessPixelFn = const float*(const char* floatBuffer, int x, int y);

 bool compare_pixels(int width, int height,
                     const char* floatA, std::function<AccessPixelFn>& atA,
                     const char* floatB, std::function<AccessPixelFn>& atB,
                     const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {

     for (int y = 0; y < height; ++y) {
         for (int x = 0; x < width; ++x) {
             const float* rgbaA = atA(floatA, x, y);
             const float* rgbaB = atB(floatB, x, y);
             float diffs[4];
             bool bad = false;
             for (int i = 0; i < 4; ++i) {
                 diffs[i] = rgbaB[i] - rgbaA[i];
                 if (std::abs(diffs[i]) > std::abs(tolRGBA[i])) {
                     bad = true;
                 }
             }
             if (bad) {
                 error(x, y, diffs);
                 return false;
             }
         }
     }
     return true;
 }

 bool ComparePixels(const GrImageInfo& infoA, const char* a, size_t rowBytesA,
                    const GrImageInfo& infoB, const char* b, size_t rowBytesB,
                    const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {
     if (infoA.width() != infoB.width() || infoA.height() != infoB.height()) {
         static constexpr float kDummyDiffs[4] = {};
         error(-1, -1, kDummyDiffs);
         return false;
     }

     SkAlphaType floatAlphaType = infoA.alphaType();
     // If one is premul and the other is unpremul we do the comparison in premul space.
     if ((infoA.alphaType() == kPremul_SkAlphaType ||
          infoB.alphaType() == kPremul_SkAlphaType) &&
         (infoA.alphaType() == kUnpremul_SkAlphaType ||
          infoB.alphaType() == kUnpremul_SkAlphaType)) {
         floatAlphaType = kPremul_SkAlphaType;
     }
     sk_sp<SkColorSpace> floatCS;
     if (SkColorSpace::Equals(infoA.colorSpace(), infoB.colorSpace())) {
         floatCS = infoA.refColorSpace();
     } else {
         floatCS = SkColorSpace::MakeSRGBLinear();
     }
     GrImageInfo floatInfo(GrColorType::kRGBA_F32, floatAlphaType, std::move(floatCS),
                           infoA.width(), infoA.height());

     size_t floatBpp = GrColorTypeBytesPerPixel(GrColorType::kRGBA_F32);
     size_t floatRowBytes = floatBpp * infoA.width();
     std::unique_ptr<char[]> floatA(new char[floatRowBytes * infoA.height()]);
     std::unique_ptr<char[]> floatB(new char[floatRowBytes * infoA.height()]);
     SkAssertResult(GrConvertPixels(floatInfo, floatA.get(), floatRowBytes, infoA, a, rowBytesA));
     SkAssertResult(GrConvertPixels(floatInfo, floatB.get(), floatRowBytes, infoB, b, rowBytesB));

     auto at = std::function<AccessPixelFn>(
         [floatBpp, floatRowBytes](const char* floatBuffer, int x, int y) {
             return reinterpret_cast<const float*>(floatBuffer + y * floatRowBytes + x * floatBpp);
         });

     return compare_pixels(infoA.width(), infoA.height(),
                           floatA.get(), at, floatB.get(), at,
                           tolRGBA, error);
 }

 bool ComparePixels(const SkPixmap& a, const SkPixmap& b, const float tolRGBA[4],
                    std::function<ComparePixmapsErrorReporter>& error) {
     return ComparePixels(a.info(), static_cast<const char*>(a.addr()), a.rowBytes(),
                          b.info(), static_cast<const char*>(b.addr()), b.rowBytes(),
                          tolRGBA, error);
 }

 bool CheckSolidPixels(const SkColor4f& col, const SkPixmap& pixmap,
                       const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {

     size_t floatBpp = GrColorTypeBytesPerPixel(GrColorType::kRGBA_F32);

     std::unique_ptr<char[]> floatA(new char[floatBpp]);
     // First convert 'col' to be compatible with 'pixmap'
     {
         sk_sp<SkColorSpace> srcCS = SkColorSpace::MakeSRGBLinear();
         GrImageInfo srcInfo(GrColorType::kRGBA_F32, kUnpremul_SkAlphaType, std::move(srcCS), 1, 1);
         GrImageInfo dstInfo(GrColorType::kRGBA_F32, pixmap.alphaType(), pixmap.refColorSpace(), 1, 1);

         SkAssertResult(GrConvertPixels(dstInfo, floatA.get(), floatBpp, srcInfo,
                                        col.vec(), floatBpp));
     }

     size_t floatRowBytes = floatBpp * pixmap.width();
     std::unique_ptr<char[]> floatB(new char[floatRowBytes * pixmap.height()]);
     // Then convert 'pixmap' to RGBA_F32
     {
         GrImageInfo dstInfo(GrColorType::kRGBA_F32, pixmap.alphaType(), pixmap.refColorSpace(),
                             pixmap.width(), pixmap.height());

         SkAssertResult(GrConvertPixels(dstInfo, floatB.get(), floatRowBytes, pixmap.info(),
                                        pixmap.addr(), pixmap.rowBytes()));
     }

     auto atA = std::function<AccessPixelFn>(
         [](const char* floatBuffer, int /* x */, int /* y */) {
             return reinterpret_cast<const float*>(floatBuffer);
         });

     auto atB = std::function<AccessPixelFn>(
         [floatBpp, floatRowBytes](const char* floatBuffer, int x, int y) {
             return reinterpret_cast<const float*>(floatBuffer + y * floatRowBytes + x * floatBpp);
         });

     return compare_pixels(pixmap.width(), pixmap.height(), floatA.get(), atA, floatB.get(), atB,
                           tolRGBA, error);
 }

 void CheckSingleThreadedProxyRefs(skiatest::Reporter* reporter,
                                   GrTextureProxy* proxy,
                                   int32_t expectedProxyRefs,
                                   int32_t expectedBackingRefs) {
     int32_t actualBackingRefs = proxy->testingOnly_getBackingRefCnt();

     REPORTER_ASSERT(reporter, proxy->refCntGreaterThan(expectedProxyRefs - 1) &&
                               !proxy->refCntGreaterThan(expectedProxyRefs));
     REPORTER_ASSERT(reporter, actualBackingRefs == expectedBackingRefs);
 }

 #include "src/utils/SkCharToGlyphCache.h"

 static SkGlyphID hash_to_glyph(uint32_t value) {
     return SkToU16(((value >> 16) ^ value) & 0xFFFF);
 }

 namespace {
 class UnicharGen {
     SkUnichar fU;
     const int fStep;
 public:
     UnicharGen(int step) : fU(0), fStep(step) {}

     SkUnichar next() {
         fU += fStep;
         return fU;
     }
 };
 }

 DEF_TEST(chartoglyph_cache, reporter) {
     SkCharToGlyphCache cache;
     const int step = 3;

     UnicharGen gen(step);
     for (int i = 0; i < 500; ++i) {
         SkUnichar c = gen.next();
         SkGlyphID glyph = hash_to_glyph(c);

         int index = cache.findGlyphIndex(c);
         if (index >= 0) {
             index = cache.findGlyphIndex(c);
         }
         REPORTER_ASSERT(reporter, index < 0);
         cache.insertCharAndGlyph(~index, c, glyph);

         UnicharGen gen2(step);
         for (int j = 0; j <= i; ++j) {
             c = gen2.next();
             glyph = hash_to_glyph(c);
             index = cache.findGlyphIndex(c);
             if ((unsigned)index != glyph) {
                 index = cache.findGlyphIndex(c);
             }
             REPORTER_ASSERT(reporter, (unsigned)index == glyph);
         }
     }
 }
	/*
	* Copyright 2017 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "tests/TestUtils.h"

	#include "include/encode/SkPngEncoder.h"
	#include "include/utils/SkBase64.h"
	#include "src/core/SkUtils.h"
	#include "src/gpu/GrContextPriv.h"
	#include "src/gpu/GrDrawingManager.h"
	#include "src/gpu/GrGpu.h"
	#include "src/gpu/GrImageInfo.h"
	#include "src/gpu/GrSurfaceContext.h"
	#include "src/gpu/GrSurfaceProxy.h"
	#include "src/gpu/GrTextureContext.h"
	#include "src/gpu/GrTextureProxy.h"
	#include "src/gpu/SkGr.h"

	void TestReadPixels(skiatest::Reporter* reporter,
	GrSurfaceContext* srcContext,
	uint32_t expectedPixelValues[],
	const char* testName) {
	int pixelCnt = srcContext->width() * srcContext->height();
	SkAutoTMalloc<uint32_t> pixels(pixelCnt);
	memset(pixels.get(), 0, sizeof(uint32_t)*pixelCnt);

	SkImageInfo ii = SkImageInfo::Make(srcContext->width(), srcContext->height(),
	kRGBA_8888_SkColorType, kPremul_SkAlphaType);
	bool read = srcContext->readPixels(ii, pixels.get(), 0, {0, 0});
	if (!read) {
	ERRORF(reporter, "%s: Error reading from texture.", testName);
	}

	for (int i = 0; i < pixelCnt; ++i) {
	if (pixels.get()[i] != expectedPixelValues[i]) {
	ERRORF(reporter, "%s: Error, pixel value %d should be 0x%08x, got 0x%08x.",
	testName, i, expectedPixelValues[i], pixels.get()[i]);
	break;
	}
	}
	}

	void TestWritePixels(skiatest::Reporter* reporter,
	GrSurfaceContext* dstContext,
	bool expectedToWork,
	const char* testName) {
	int pixelCnt = dstContext->width() * dstContext->height();
	SkAutoTMalloc<uint32_t> pixels(pixelCnt);
	for (int y = 0; y < dstContext->width(); ++y) {
	for (int x = 0; x < dstContext->height(); ++x) {
	pixels.get()[y * dstContext->width() + x] =
	SkColorToPremulGrColor(SkColorSetARGB(2*y, x, y, x + y));
	}
	}

	SkImageInfo ii = SkImageInfo::Make(dstContext->width(), dstContext->height(),
	kRGBA_8888_SkColorType, kPremul_SkAlphaType);
	bool write = dstContext->writePixels(ii, pixels.get(), 0, {0, 0});
	if (!write) {
	if (expectedToWork) {
	ERRORF(reporter, "%s: Error writing to texture.", testName);
	}
	return;
	}

	if (write && !expectedToWork) {
	ERRORF(reporter, "%s: writePixels succeeded when it wasn't supposed to.", testName);
	return;
	}

	TestReadPixels(reporter, dstContext, pixels.get(), testName);
	}

	void TestCopyFromSurface(skiatest::Reporter* reporter,
	GrContext* context,
	GrSurfaceProxy* proxy,
	GrColorType colorType,
	uint32_t expectedPixelValues[],
	const char* testName) {
	sk_sp<GrTextureProxy> dstProxy = GrSurfaceProxy::Copy(context, proxy, GrMipMapped::kNo,
	SkBackingFit::kExact, SkBudgeted::kYes);
	SkASSERT(dstProxy);

	auto dstContext = context->priv().makeWrappedSurfaceContext(std::move(dstProxy), colorType,
	kPremul_SkAlphaType);
	SkASSERT(dstContext);

	TestReadPixels(reporter, dstContext.get(), expectedPixelValues, testName);
	}

	void FillPixelData(int width, int height, GrColor* data) {
	for (int j = 0; j < height; ++j) {
	for (int i = 0; i < width; ++i) {
	unsigned int red = (unsigned int)(256.f * (i / (float)width));
	unsigned int green = (unsigned int)(256.f * (j / (float)height));
	data[i + j * width] = GrColorPackRGBA(red - (red >> 8), green - (green >> 8),
	0xff, 0xff);
	}
	}
	}

	bool CreateBackendTexture(GrContext* context,
	GrBackendTexture* backendTex,
	const SkImageInfo& ii,
	const SkColor4f& color,
	GrMipMapped mipMapped,
	GrRenderable renderable) {
	*backendTex = context->createBackendTexture(ii.width(), ii.height(), ii.colorType(),
	color, mipMapped, renderable);
	return backendTex->isValid();
	}

	void DeleteBackendTexture(GrContext* context, const GrBackendTexture& backendTex) {
	GrFlushInfo flushInfo;
	flushInfo.fFlags = kSyncCpu_GrFlushFlag;
	context->flush(flushInfo);
	context->deleteBackendTexture(backendTex);
	}

	bool DoesFullBufferContainCorrectColor(const GrColor* srcBuffer,
	const GrColor* dstBuffer,
	int width, int height) {
	const GrColor* srcPtr = srcBuffer;
	const GrColor* dstPtr = dstBuffer;
	for (int j = 0; j < height; ++j) {
	for (int i = 0; i < width; ++i) {
	if (srcPtr[i] != dstPtr[i]) {
	return false;
	}
	}
	srcPtr += width;
	dstPtr += width;
	}
	return true;
	}

	bool BipmapToBase64DataURI(const SkBitmap& bitmap, SkString* dst) {
	SkPixmap pm;
	if (!bitmap.peekPixels(&pm)) {
	dst->set("peekPixels failed");
	return false;
	}

	// We're going to embed this PNG in a data URI, so make it as small as possible
	SkPngEncoder::Options options;
	options.fFilterFlags = SkPngEncoder::FilterFlag::kAll;
	options.fZLibLevel = 9;

	SkDynamicMemoryWStream wStream;
	if (!SkPngEncoder::Encode(&wStream, pm, options)) {
	dst->set("SkPngEncoder::Encode failed");
	return false;
	}

	sk_sp<SkData> pngData = wStream.detachAsData();
	size_t len = SkBase64::Encode(pngData->data(), pngData->size(), nullptr);

	// The PNG can be almost arbitrarily large. We don't want to fill our logs with enormous URLs.
	// Infra says these can be pretty big, as long as we're only outputting them on failure.
	static const size_t kMaxBase64Length = 1024 * 1024;
	if (len > kMaxBase64Length) {
	dst->printf("Encoded image too large (%u bytes)", static_cast<uint32_t>(len));
	return false;
	}

	dst->resize(len);
	SkBase64::Encode(pngData->data(), pngData->size(), dst->writable_str());
	dst->prepend("data:image/png;base64,");
	return true;
	}

	using AccessPixelFn = const float(const char floatBuffer, int x, int y);

	bool compare_pixels(int width, int height,
	const char* floatA, std::function<AccessPixelFn>& atA,
	const char* floatB, std::function<AccessPixelFn>& atB,
	const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {

	for (int y = 0; y < height; ++y) {
	for (int x = 0; x < width; ++x) {
	const float* rgbaA = atA(floatA, x, y);
	const float* rgbaB = atB(floatB, x, y);
	float diffs[4];
	bool bad = false;
	for (int i = 0; i < 4; ++i) {
	diffs[i] = rgbaB[i] - rgbaA[i];
	if (std::abs(diffs[i]) > std::abs(tolRGBA[i])) {
	bad = true;
	}
	}
	if (bad) {
	error(x, y, diffs);
	return false;
	}
	}
	}
	return true;
	}

	bool ComparePixels(const GrImageInfo& infoA, const char* a, size_t rowBytesA,
	const GrImageInfo& infoB, const char* b, size_t rowBytesB,
	const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {
	if (infoA.width() != infoB.width() \|\| infoA.height() != infoB.height()) {
	static constexpr float kDummyDiffs[4] = {};
	error(-1, -1, kDummyDiffs);
	return false;
	}

	SkAlphaType floatAlphaType = infoA.alphaType();
	// If one is premul and the other is unpremul we do the comparison in premul space.
	if ((infoA.alphaType() == kPremul_SkAlphaType \|\|
	infoB.alphaType() == kPremul_SkAlphaType) &&
	(infoA.alphaType() == kUnpremul_SkAlphaType \|\|
	infoB.alphaType() == kUnpremul_SkAlphaType)) {
	floatAlphaType = kPremul_SkAlphaType;
	}
	sk_sp<SkColorSpace> floatCS;
	if (SkColorSpace::Equals(infoA.colorSpace(), infoB.colorSpace())) {
	floatCS = infoA.refColorSpace();
	} else {
	floatCS = SkColorSpace::MakeSRGBLinear();
	}
	GrImageInfo floatInfo(GrColorType::kRGBA_F32, floatAlphaType, std::move(floatCS),
	infoA.width(), infoA.height());

	size_t floatBpp = GrColorTypeBytesPerPixel(GrColorType::kRGBA_F32);
	size_t floatRowBytes = floatBpp * infoA.width();
	std::unique_ptr<char[]> floatA(new char[floatRowBytes * infoA.height()]);
	std::unique_ptr<char[]> floatB(new char[floatRowBytes * infoA.height()]);
	SkAssertResult(GrConvertPixels(floatInfo, floatA.get(), floatRowBytes, infoA, a, rowBytesA));
	SkAssertResult(GrConvertPixels(floatInfo, floatB.get(), floatRowBytes, infoB, b, rowBytesB));

	auto at = std::function<AccessPixelFn>(
	[floatBpp, floatRowBytes](const char* floatBuffer, int x, int y) {
	return reinterpret_cast<const float>(floatBuffer + y floatRowBytes + x * floatBpp);
	});

	return compare_pixels(infoA.width(), infoA.height(),
	floatA.get(), at, floatB.get(), at,
	tolRGBA, error);
	}

	bool ComparePixels(const SkPixmap& a, const SkPixmap& b, const float tolRGBA[4],
	std::function<ComparePixmapsErrorReporter>& error) {
	return ComparePixels(a.info(), static_cast<const char*>(a.addr()), a.rowBytes(),
	b.info(), static_cast<const char*>(b.addr()), b.rowBytes(),
	tolRGBA, error);
	}

	bool CheckSolidPixels(const SkColor4f& col, const SkPixmap& pixmap,
	const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {

	size_t floatBpp = GrColorTypeBytesPerPixel(GrColorType::kRGBA_F32);

	std::unique_ptr<char[]> floatA(new char[floatBpp]);
	// First convert 'col' to be compatible with 'pixmap'
	{
	sk_sp<SkColorSpace> srcCS = SkColorSpace::MakeSRGBLinear();
	GrImageInfo srcInfo(GrColorType::kRGBA_F32, kUnpremul_SkAlphaType, std::move(srcCS), 1, 1);
	GrImageInfo dstInfo(GrColorType::kRGBA_F32, pixmap.alphaType(), pixmap.refColorSpace(), 1, 1);

	SkAssertResult(GrConvertPixels(dstInfo, floatA.get(), floatBpp, srcInfo,
	col.vec(), floatBpp));
	}

	size_t floatRowBytes = floatBpp * pixmap.width();
	std::unique_ptr<char[]> floatB(new char[floatRowBytes * pixmap.height()]);
	// Then convert 'pixmap' to RGBA_F32
	{
	GrImageInfo dstInfo(GrColorType::kRGBA_F32, pixmap.alphaType(), pixmap.refColorSpace(),
	pixmap.width(), pixmap.height());

	SkAssertResult(GrConvertPixels(dstInfo, floatB.get(), floatRowBytes, pixmap.info(),
	pixmap.addr(), pixmap.rowBytes()));
	}

	auto atA = std::function<AccessPixelFn>(
	[](const char* floatBuffer, int /* x /, int / y */) {
	return reinterpret_cast<const float*>(floatBuffer);
	});

	auto atB = std::function<AccessPixelFn>(
	[floatBpp, floatRowBytes](const char* floatBuffer, int x, int y) {
	return reinterpret_cast<const float>(floatBuffer + y floatRowBytes + x * floatBpp);
	});

	return compare_pixels(pixmap.width(), pixmap.height(), floatA.get(), atA, floatB.get(), atB,
	tolRGBA, error);
	}

	void CheckSingleThreadedProxyRefs(skiatest::Reporter* reporter,
	GrTextureProxy* proxy,
	int32_t expectedProxyRefs,
	int32_t expectedBackingRefs) {
	int32_t actualBackingRefs = proxy->testingOnly_getBackingRefCnt();

	REPORTER_ASSERT(reporter, proxy->refCntGreaterThan(expectedProxyRefs - 1) &&
	!proxy->refCntGreaterThan(expectedProxyRefs));
	REPORTER_ASSERT(reporter, actualBackingRefs == expectedBackingRefs);
	}

	#include "src/utils/SkCharToGlyphCache.h"

	static SkGlyphID hash_to_glyph(uint32_t value) {
	return SkToU16(((value >> 16) ^ value) & 0xFFFF);
	}

	namespace {
	class UnicharGen {
	SkUnichar fU;
	const int fStep;
	public:
	UnicharGen(int step) : fU(0), fStep(step) {}

	SkUnichar next() {
	fU += fStep;
	return fU;
	}
	};
	}

	DEF_TEST(chartoglyph_cache, reporter) {
	SkCharToGlyphCache cache;
	const int step = 3;

	UnicharGen gen(step);
	for (int i = 0; i < 500; ++i) {
	SkUnichar c = gen.next();
	SkGlyphID glyph = hash_to_glyph(c);

	int index = cache.findGlyphIndex(c);
	if (index >= 0) {
	index = cache.findGlyphIndex(c);
	}
	REPORTER_ASSERT(reporter, index < 0);
	cache.insertCharAndGlyph(~index, c, glyph);

	UnicharGen gen2(step);
	for (int j = 0; j <= i; ++j) {
	c = gen2.next();
	glyph = hash_to_glyph(c);
	index = cache.findGlyphIndex(c);
	if ((unsigned)index != glyph) {
	index = cache.findGlyphIndex(c);
	}
	REPORTER_ASSERT(reporter, (unsigned)index == glyph);
	}
	}
	}