| /* |
| * 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 "SkGpuDevice.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; |
| |
| DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadWriteAlpha, reporter, context) { |
| unsigned char alphaData[X_SIZE][Y_SIZE]; |
| |
| memset(alphaData, 0, X_SIZE * Y_SIZE); |
| |
| bool match; |
| unsigned char readback[X_SIZE][Y_SIZE]; |
| |
| for (int rt = 0; rt < 2; ++rt) { |
| GrSurfaceDesc desc; |
| // let Skia know we will be using this texture as a render target |
| desc.fFlags = rt ? kRenderTarget_GrSurfaceFlag : kNone_GrSurfaceFlags; |
| // it is a single channel texture |
| desc.fConfig = kAlpha_8_GrPixelConfig; |
| desc.fWidth = X_SIZE; |
| desc.fHeight = Y_SIZE; |
| |
| // We are initializing the texture with zeros here |
| SkAutoTUnref<GrTexture> texture( |
| context->textureProvider()->createTexture(desc, false, alphaData, 0)); |
| if (!texture) { |
| if (!rt) { |
| ERRORF(reporter, "Could not create alpha texture."); |
| } |
| continue; |
| } |
| |
| // create a distinctive texture |
| for (int y = 0; y < Y_SIZE; ++y) { |
| for (int x = 0; x < X_SIZE; ++x) { |
| alphaData[x][y] = y*X_SIZE+x; |
| } |
| } |
| |
| // upload the texture |
| texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, |
| alphaData, 0); |
| |
| // clear readback to something non-zero so we can detect readback failures |
| memset(readback, 0x1, X_SIZE * Y_SIZE); |
| |
| // read the texture back |
| texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, |
| readback, 0); |
| |
| // make sure the original & read back versions match |
| match = true; |
| |
| for (int y = 0; y < Y_SIZE && match; ++y) { |
| for (int x = 0; x < X_SIZE && match; ++x) { |
| if (alphaData[x][y] != readback[x][y]) { |
| SkDebugf("Failed alpha readback. Expected: 0x%02x, " |
| "Got: 0x%02x at (%d,%d), rt: %d", alphaData[x][y], readback[x][y], x, |
| y, rt); |
| match = false; |
| } |
| } |
| } |
| |
| // Now try writing on the single channel texture (if we could create as a RT). |
| if (texture->asRenderTarget()) { |
| SkSurfaceProps props(SkSurfaceProps::kLegacyFontHost_InitType); |
| SkAutoTUnref<SkBaseDevice> device(SkGpuDevice::Create( |
| texture->asRenderTarget(), &props, SkGpuDevice::kUninit_InitContents)); |
| SkCanvas canvas(device); |
| |
| SkPaint paint; |
| |
| const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10); |
| |
| paint.setColor(SK_ColorWHITE); |
| |
| canvas.drawRect(rect, paint); |
| |
| texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, readback, 0); |
| |
| match = true; |
| |
| for (int y = 0; y < Y_SIZE && match; ++y) { |
| for (int x = 0; x < X_SIZE && match; ++x) { |
| if (0xFF != readback[x][y]) { |
| ERRORF(reporter, |
| "Failed alpha readback after clear. Expected: 0xFF, Got: 0x%02x at " |
| "(%d,%d)", readback[x][y], x, y); |
| match = false; |
| } |
| } |
| } |
| } |
| } |
| |
| static const GrPixelConfig kRGBAConfigs[] { |
| kRGBA_8888_GrPixelConfig, |
| kBGRA_8888_GrPixelConfig, |
| kSRGBA_8888_GrPixelConfig |
| }; |
| |
| // 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[x][y] = GrColorPackRGBA(6, 7, 8, alphaData[x][y]); |
| } |
| } |
| SkAutoTUnref<GrTexture> texture( |
| context->textureProvider()->createTexture(desc, false, 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; |
| } |
| |
| // clear readback to something non-zero so we can detect readback failures |
| memset(readback, 0x0, X_SIZE * Y_SIZE); |
| |
| // read the texture back |
| texture->readPixels(0, 0, desc.fWidth, desc.fHeight, kAlpha_8_GrPixelConfig, readback, |
| 0); |
| |
| match = true; |
| |
| for (int y = 0; y < Y_SIZE && match; ++y) { |
| for (int x = 0; x < X_SIZE && match; ++x) { |
| if (alphaData[x][y] != readback[x][y]) { |
| texture->readPixels(0, 0, desc.fWidth, desc.fHeight, |
| kAlpha_8_GrPixelConfig, readback, 0); |
| ERRORF(reporter, |
| "Failed alpha readback from cfg %d. Expected: 0x%02x, Got: 0x%02x at" |
| " (%d,%d), rt:%d", desc.fConfig, alphaData[x][y], readback[x][y], x, |
| y, rt); |
| match = false; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| #endif |