tests/ReadWriteAlphaTest.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 "Test.h"

 // This test is specific to the GPU backend.
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrContextPriv.h"
 #include "GrProxyProvider.h"
 #include "GrResourceProvider.h"
 #include "GrSurfaceContext.h"
 #include "GrSurfaceProxy.h"
 #include "GrTextureProxy.h"
 #include "ProxyUtils.h"
 #include "SkCanvas.h"
 #include "SkSurface.h"

 // This was made indivisible by 4 to ensure we test setting GL_PACK_ALIGNMENT properly.
 static const int X_SIZE = 13;
 static const int Y_SIZE = 13;

 static void validate_alpha_data(skiatest::Reporter* reporter, int w, int h, const uint8_t* actual,
                                 size_t actualRowBytes, const uint8_t* expected, SkString extraMsg,
                                 GrColorType colorType) {
     for (int y = 0; y < h; ++y) {
         for (int x = 0; x < w; ++x) {
             uint8_t a = actual[y * actualRowBytes + x];
             uint8_t e = expected[y * w + x];
             if (GrColorType::kRGBA_1010102 == colorType) {
                 // This config only preserves two bits of alpha
                 a >>= 6;
                 e >>= 6;
             }
             if (e != a) {
                 ERRORF(reporter,
                        "Failed alpha readback. Expected: 0x%02x, Got: 0x%02x at (%d,%d), %s",
                        e, a, x, y, extraMsg.c_str());
                 return;
             }
         }
     }
 }

 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadWriteAlpha, reporter, ctxInfo) {
     GrContext* context = ctxInfo.grContext();
     GrProxyProvider* proxyProvider = context->contextPriv().proxyProvider();

     unsigned char alphaData[X_SIZE * Y_SIZE];

     static const int kClearValue = 0x2;

     bool match;
     static const size_t kRowBytes[] = {0, X_SIZE, X_SIZE + 1, 2 * X_SIZE - 1};
     {
         GrSurfaceDesc desc;
         desc.fFlags     = kNone_GrSurfaceFlags;
         desc.fConfig    = kAlpha_8_GrPixelConfig;    // it is a single channel texture
         desc.fWidth     = X_SIZE;
         desc.fHeight    = Y_SIZE;

         // We are initializing the texture with zeros here
         memset(alphaData, 0, X_SIZE * Y_SIZE);

         sk_sp<GrTextureProxy> proxy =
                 proxyProvider->createTextureProxy(desc, SkBudgeted::kNo, alphaData, 0);
         if (!proxy) {
             ERRORF(reporter, "Could not create alpha texture.");
             return;
         }
         sk_sp<GrSurfaceContext> sContext(context->contextPriv().makeWrappedSurfaceContext(
                                                                   std::move(proxy)));

         const SkImageInfo ii = SkImageInfo::MakeA8(X_SIZE, Y_SIZE);
         sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii));

         // create a distinctive texture
         for (int y = 0; y < Y_SIZE; ++y) {
             for (int x = 0; x < X_SIZE; ++x) {
                 alphaData[y * X_SIZE + x] = y*X_SIZE+x;
             }
         }

         for (auto rowBytes : kRowBytes) {

             // upload the texture (do per-rowbytes iteration because we may overwrite below).
             bool result = sContext->writePixels(ii, alphaData, 0, 0, 0);
             REPORTER_ASSERT(reporter, result, "Initial A8 writePixels failed");

             size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE;
             size_t bufLen = nonZeroRowBytes * Y_SIZE;
             std::unique_ptr<uint8_t[]> readback(new uint8_t[bufLen]);
             // clear readback to something non-zero so we can detect readback failures
             memset(readback.get(), kClearValue, bufLen);

             // read the texture back
             result = sContext->readPixels(ii, readback.get(), rowBytes, 0, 0);
             // We don't require reading from kAlpha_8 to be supported. TODO: At least make this work
             // when kAlpha_8 is renderable.
             if (!result) {
                 continue;
             }
             REPORTER_ASSERT(reporter, result, "Initial A8 readPixels failed");

             // make sure the original & read back versions match
             SkString msg;
             msg.printf("rb:%d A8", SkToU32(rowBytes));
             validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
                                 alphaData, msg, GrColorType::kAlpha_8);

             // Now try writing to a single channel surface (if we could create one).
             if (surf) {
                 SkCanvas* canvas = surf->getCanvas();

                 SkPaint paint;

                 const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10);

                 paint.setColor(SK_ColorWHITE);

                 canvas->drawRect(rect, paint);

                 // Workaround for a bug in old GCC/glibc used in our Chromecast toolchain:
                 // error: call to '__warn_memset_zero_len' declared with attribute warning:
                 //        memset used with constant zero length parameter; this could be due
                 //        to transposed parameters
                 // See also: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61294
                 if (bufLen > 0) {
                     memset(readback.get(), kClearValue, bufLen);
                 }
                 result = surf->readPixels(ii, readback.get(), nonZeroRowBytes, 0, 0);
                 REPORTER_ASSERT(reporter, result, "A8 readPixels after clear failed");

                 match = true;
                 for (int y = 0; y < Y_SIZE && match; ++y) {
                     for (int x = 0; x < X_SIZE && match; ++x) {
                         uint8_t rbValue = readback.get()[y * nonZeroRowBytes + x];
                         if (0xFF != rbValue) {
                             ERRORF(reporter,
                                    "Failed alpha readback after clear. Expected: 0xFF, Got: 0x%02x"
                                    " at (%d,%d), rb:%d", rbValue, x, y, SkToU32(rowBytes));
                             match = false;
                         }
                     }
                 }
             }
         }
     }

     static constexpr struct {
         GrColorType fColorType;
         GrSRGBEncoded fSRGBEncoded;
     } kInfos[] = {
             {GrColorType::kRGBA_8888, GrSRGBEncoded::kNo},
             {GrColorType::kBGRA_8888, GrSRGBEncoded::kNo},
             {GrColorType::kRGBA_8888, GrSRGBEncoded::kYes},
             {GrColorType::kRGBA_1010102, GrSRGBEncoded::kNo},
     };

     for (int y = 0; y < Y_SIZE; ++y) {
         for (int x = 0; x < X_SIZE; ++x) {
             alphaData[y * X_SIZE + x] = y*X_SIZE+x;
         }
     }

     const SkImageInfo dstInfo = SkImageInfo::Make(X_SIZE, Y_SIZE,
                                                   kAlpha_8_SkColorType,
                                                   kPremul_SkAlphaType);

     // Attempt to read back just alpha from a RGBA/BGRA texture. Once with a texture-only src and
     // once with a render target.
     for (auto info : kInfos) {
         for (int rt = 0; rt < 2; ++rt) {
             uint32_t rgbaData[X_SIZE * Y_SIZE];
             // Make the alpha channel of the rgba texture come from alphaData.
             for (int y = 0; y < Y_SIZE; ++y) {
                 for (int x = 0; x < X_SIZE; ++x) {
                     rgbaData[y * X_SIZE + x] = GrColorPackRGBA(6, 7, 8, alphaData[y * X_SIZE + x]);
                 }
             }

             auto origin = rt ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;
             auto proxy = sk_gpu_test::MakeTextureProxyFromData(context, rt, X_SIZE, Y_SIZE,
                                                                info.fColorType, info.fSRGBEncoded,
                                                                origin, rgbaData, 0);
             if (!proxy) {
                 continue;
             }

             sk_sp<SkColorSpace> colorSpace;
             if (GrPixelConfigIsSRGB(proxy->config())) {
                 colorSpace = SkColorSpace::MakeSRGB();
             }
             sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeWrappedSurfaceContext(
                     std::move(proxy), std::move(colorSpace));

             for (auto rowBytes : kRowBytes) {
                 size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE;

                 std::unique_ptr<uint8_t[]> readback(new uint8_t[nonZeroRowBytes * Y_SIZE]);
                 // Clear so we don't accidentally see values from previous iteration.
                 memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE);

                 // read the texture back
                 bool result = sContext->readPixels(dstInfo, readback.get(), rowBytes, 0, 0);
                 REPORTER_ASSERT(reporter, result, "8888 readPixels failed");

                 // make sure the original & read back versions match
                 SkString msg;
                 msg.printf("rt:%d, rb:%d 8888", rt, SkToU32(rowBytes));
                 validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
                                     alphaData, msg, info.fColorType);
             }
         }
     }
 }

 #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 "Test.h"

	// This test is specific to the GPU backend.
	#if SK_SUPPORT_GPU
	#include "GrContext.h"
	#include "GrContextPriv.h"
	#include "GrProxyProvider.h"
	#include "GrResourceProvider.h"
	#include "GrSurfaceContext.h"
	#include "GrSurfaceProxy.h"
	#include "GrTextureProxy.h"
	#include "ProxyUtils.h"
	#include "SkCanvas.h"
	#include "SkSurface.h"

	// This was made indivisible by 4 to ensure we test setting GL_PACK_ALIGNMENT properly.
	static const int X_SIZE = 13;
	static const int Y_SIZE = 13;

	static void validate_alpha_data(skiatest::Reporter* reporter, int w, int h, const uint8_t* actual,
	size_t actualRowBytes, const uint8_t* expected, SkString extraMsg,
	GrColorType colorType) {
	for (int y = 0; y < h; ++y) {
	for (int x = 0; x < w; ++x) {
	uint8_t a = actual[y * actualRowBytes + x];
	uint8_t e = expected[y * w + x];
	if (GrColorType::kRGBA_1010102 == colorType) {
	// This config only preserves two bits of alpha
	a >>= 6;
	e >>= 6;
	}
	if (e != a) {
	ERRORF(reporter,
	"Failed alpha readback. Expected: 0x%02x, Got: 0x%02x at (%d,%d), %s",
	e, a, x, y, extraMsg.c_str());
	return;
	}
	}
	}
	}

	DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadWriteAlpha, reporter, ctxInfo) {
	GrContext* context = ctxInfo.grContext();
	GrProxyProvider* proxyProvider = context->contextPriv().proxyProvider();

	unsigned char alphaData[X_SIZE * Y_SIZE];

	static const int kClearValue = 0x2;

	bool match;
	static const size_t kRowBytes[] = {0, X_SIZE, X_SIZE + 1, 2 * X_SIZE - 1};
	{
	GrSurfaceDesc desc;
	desc.fFlags = kNone_GrSurfaceFlags;
	desc.fConfig = kAlpha_8_GrPixelConfig; // it is a single channel texture
	desc.fWidth = X_SIZE;
	desc.fHeight = Y_SIZE;

	// We are initializing the texture with zeros here
	memset(alphaData, 0, X_SIZE * Y_SIZE);

	sk_sp<GrTextureProxy> proxy =
	proxyProvider->createTextureProxy(desc, SkBudgeted::kNo, alphaData, 0);
	if (!proxy) {
	ERRORF(reporter, "Could not create alpha texture.");
	return;
	}
	sk_sp<GrSurfaceContext> sContext(context->contextPriv().makeWrappedSurfaceContext(
	std::move(proxy)));

	const SkImageInfo ii = SkImageInfo::MakeA8(X_SIZE, Y_SIZE);
	sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii));

	// create a distinctive texture
	for (int y = 0; y < Y_SIZE; ++y) {
	for (int x = 0; x < X_SIZE; ++x) {
	alphaData[y * X_SIZE + x] = y*X_SIZE+x;
	}
	}

	for (auto rowBytes : kRowBytes) {

	// upload the texture (do per-rowbytes iteration because we may overwrite below).
	bool result = sContext->writePixels(ii, alphaData, 0, 0, 0);
	REPORTER_ASSERT(reporter, result, "Initial A8 writePixels failed");

	size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE;
	size_t bufLen = nonZeroRowBytes * Y_SIZE;
	std::unique_ptr<uint8_t[]> readback(new uint8_t[bufLen]);
	// clear readback to something non-zero so we can detect readback failures
	memset(readback.get(), kClearValue, bufLen);

	// read the texture back
	result = sContext->readPixels(ii, readback.get(), rowBytes, 0, 0);
	// We don't require reading from kAlpha_8 to be supported. TODO: At least make this work
	// when kAlpha_8 is renderable.
	if (!result) {
	continue;
	}
	REPORTER_ASSERT(reporter, result, "Initial A8 readPixels failed");

	// make sure the original & read back versions match
	SkString msg;
	msg.printf("rb:%d A8", SkToU32(rowBytes));
	validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
	alphaData, msg, GrColorType::kAlpha_8);

	// Now try writing to a single channel surface (if we could create one).
	if (surf) {
	SkCanvas* canvas = surf->getCanvas();

	SkPaint paint;

	const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10);

	paint.setColor(SK_ColorWHITE);

	canvas->drawRect(rect, paint);

	// Workaround for a bug in old GCC/glibc used in our Chromecast toolchain:
	// error: call to '__warn_memset_zero_len' declared with attribute warning:
	// memset used with constant zero length parameter; this could be due
	// to transposed parameters
	// See also: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61294
	if (bufLen > 0) {
	memset(readback.get(), kClearValue, bufLen);
	}
	result = surf->readPixels(ii, readback.get(), nonZeroRowBytes, 0, 0);
	REPORTER_ASSERT(reporter, result, "A8 readPixels after clear failed");

	match = true;
	for (int y = 0; y < Y_SIZE && match; ++y) {
	for (int x = 0; x < X_SIZE && match; ++x) {
	uint8_t rbValue = readback.get()[y * nonZeroRowBytes + x];
	if (0xFF != rbValue) {
	ERRORF(reporter,
	"Failed alpha readback after clear. Expected: 0xFF, Got: 0x%02x"
	" at (%d,%d), rb:%d", rbValue, x, y, SkToU32(rowBytes));
	match = false;
	}
	}
	}
	}
	}
	}

	static constexpr struct {
	GrColorType fColorType;
	GrSRGBEncoded fSRGBEncoded;
	} kInfos[] = {
	{GrColorType::kRGBA_8888, GrSRGBEncoded::kNo},
	{GrColorType::kBGRA_8888, GrSRGBEncoded::kNo},
	{GrColorType::kRGBA_8888, GrSRGBEncoded::kYes},
	{GrColorType::kRGBA_1010102, GrSRGBEncoded::kNo},
	};

	for (int y = 0; y < Y_SIZE; ++y) {
	for (int x = 0; x < X_SIZE; ++x) {
	alphaData[y * X_SIZE + x] = y*X_SIZE+x;
	}
	}

	const SkImageInfo dstInfo = SkImageInfo::Make(X_SIZE, Y_SIZE,
	kAlpha_8_SkColorType,
	kPremul_SkAlphaType);

	// Attempt to read back just alpha from a RGBA/BGRA texture. Once with a texture-only src and
	// once with a render target.
	for (auto info : kInfos) {
	for (int rt = 0; rt < 2; ++rt) {
	uint32_t rgbaData[X_SIZE * Y_SIZE];
	// Make the alpha channel of the rgba texture come from alphaData.
	for (int y = 0; y < Y_SIZE; ++y) {
	for (int x = 0; x < X_SIZE; ++x) {
	rgbaData[y * X_SIZE + x] = GrColorPackRGBA(6, 7, 8, alphaData[y * X_SIZE + x]);
	}
	}

	auto origin = rt ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;
	auto proxy = sk_gpu_test::MakeTextureProxyFromData(context, rt, X_SIZE, Y_SIZE,
	info.fColorType, info.fSRGBEncoded,
	origin, rgbaData, 0);
	if (!proxy) {
	continue;
	}

	sk_sp<SkColorSpace> colorSpace;
	if (GrPixelConfigIsSRGB(proxy->config())) {
	colorSpace = SkColorSpace::MakeSRGB();
	}
	sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeWrappedSurfaceContext(
	std::move(proxy), std::move(colorSpace));

	for (auto rowBytes : kRowBytes) {
	size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE;

	std::unique_ptr<uint8_t[]> readback(new uint8_t[nonZeroRowBytes * Y_SIZE]);
	// Clear so we don't accidentally see values from previous iteration.
	memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE);

	// read the texture back
	bool result = sContext->readPixels(dstInfo, readback.get(), rowBytes, 0, 0);
	REPORTER_ASSERT(reporter, result, "8888 readPixels failed");

	// make sure the original & read back versions match
	SkString msg;
	msg.printf("rt:%d, rb:%d 8888", rt, SkToU32(rowBytes));
	validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
	alphaData, msg, info.fColorType);
	}
	}
	}
	}

	#endif