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- /*
- * 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 "tests/Test.h"
- // This test is specific to the GPU backend.
- #include "include/core/SkCanvas.h"
- #include "include/core/SkSurface.h"
- #include "include/gpu/GrContext.h"
- #include "include/private/SkTo.h"
- #include "src/gpu/GrContextPriv.h"
- #include "src/gpu/GrProxyProvider.h"
- #include "src/gpu/GrResourceProvider.h"
- #include "src/gpu/GrSurfaceContext.h"
- #include "src/gpu/GrSurfaceProxy.h"
- #include "src/gpu/GrTextureProxy.h"
- #include "tools/gpu/ProxyUtils.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->priv().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.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);
- const SkImageInfo ii = SkImageInfo::MakeA8(X_SIZE, Y_SIZE);
- SkPixmap pixmap(ii, alphaData, ii.minRowBytes());
- sk_sp<SkImage> alphaImg = SkImage::MakeRasterCopy(pixmap);
- sk_sp<GrTextureProxy> proxy = proxyProvider->createTextureProxy(
- alphaImg, GrRenderable::kNo, 1, SkBudgeted::kNo, SkBackingFit::kExact);
- if (!proxy) {
- ERRORF(reporter, "Could not create alpha texture.");
- return;
- }
- sk_sp<GrSurfaceContext> sContext(context->priv().makeWrappedSurfaceContext(
- std::move(proxy), GrColorType::kAlpha_8, kPremul_SkAlphaType));
- 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;
- SkAlphaType fAlphaType;
- } kInfos[] = {
- {GrColorType::kRGBA_8888, kPremul_SkAlphaType},
- {GrColorType::kBGRA_8888, kPremul_SkAlphaType},
- {GrColorType::kRGBA_8888_SRGB, kPremul_SkAlphaType},
- {GrColorType::kRGBA_1010102, kPremul_SkAlphaType},
- };
- 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 (auto renderable : {GrRenderable::kNo, GrRenderable::kYes}) {
- 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 = GrRenderable::kYes == renderable ? kBottomLeft_GrSurfaceOrigin
- : kTopLeft_GrSurfaceOrigin;
- auto proxy = sk_gpu_test::MakeTextureProxyFromData(
- context, renderable, X_SIZE, Y_SIZE, info.fColorType, info.fAlphaType, origin,
- rgbaData, 0);
- if (!proxy) {
- continue;
- }
- sk_sp<GrSurfaceContext> sContext = context->priv().makeWrappedSurfaceContext(
- std::move(proxy), info.fColorType, kPremul_SkAlphaType);
- 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", GrRenderable::kYes == renderable,
- SkToU32(rowBytes));
- validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
- alphaData, msg, info.fColorType);
- }
- }
- }
- }
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