| /* |
| * 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 "GrResourceProvider.h" |
| #include "GrSurfaceContext.h" |
| #include "GrSurfaceProxy.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) { |
| 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 (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(); |
| 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(GrSurfaceProxy::MakeDeferred(*context->caps(), |
| context->resourceProvider(), |
| 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), nullptr)); |
| |
| 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_MESSAGE(reporter, result, "Initial A8 writePixels failed"); |
| |
| size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE; |
| std::unique_ptr<uint8_t[]> readback(new uint8_t[nonZeroRowBytes * Y_SIZE]); |
| // clear readback to something non-zero so we can detect readback failures |
| memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE); |
| |
| // read the texture back |
| result = sContext->readPixels(ii, readback.get(), rowBytes, 0, 0); |
| REPORTER_ASSERT_MESSAGE(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); |
| |
| // 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); |
| |
| memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE); |
| result = surf->readPixels(ii, readback.get(), nonZeroRowBytes, 0, 0); |
| REPORTER_ASSERT_MESSAGE(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 const GrPixelConfig kRGBAConfigs[] { |
| kRGBA_8888_GrPixelConfig, |
| kBGRA_8888_GrPixelConfig, |
| kSRGBA_8888_GrPixelConfig |
| }; |
| |
| 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; |
| } |
| } |
| |
| // 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 cfg : kRGBAConfigs) { |
| for (int rt = 0; rt < 2; ++rt) { |
| GrSurfaceDesc desc; |
| desc.fFlags = rt ? kRenderTarget_GrSurfaceFlag : kNone_GrSurfaceFlags; |
| desc.fConfig = cfg; |
| desc.fWidth = X_SIZE; |
| desc.fHeight = Y_SIZE; |
| |
| 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]); |
| } |
| } |
| sk_sp<GrTexture> texture( |
| context->resourceProvider()->createTexture(desc, SkBudgeted::kNo, rgbaData, 0)); |
| if (!texture) { |
| // We always expect to be able to create a RGBA texture |
| if (!rt && kRGBA_8888_GrPixelConfig == desc.fConfig) { |
| ERRORF(reporter, "Failed to create RGBA texture."); |
| } |
| continue; |
| } |
| |
| 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 = texture->readPixels(0, 0, desc.fWidth, desc.fHeight, |
| kAlpha_8_GrPixelConfig, |
| readback.get(), rowBytes); |
| REPORTER_ASSERT_MESSAGE(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); |
| } |
| } |
| } |
| } |
| |
| #endif |