| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| // This test is specific to the GPU backend. |
| #if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID) |
| |
| #include "GrContextFactory.h" |
| #include "SkGpuDevice.h" |
| #include "Test.h" |
| |
| static const int X_SIZE = 12; |
| static const int Y_SIZE = 12; |
| |
| DEF_GPUTEST(ReadWriteAlpha, reporter, factory) { |
| for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) { |
| GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type); |
| if (!GrContextFactory::IsRenderingGLContext(glType)) { |
| continue; |
| } |
| GrContext* context = factory->get(glType); |
| if (NULL == context) { |
| continue; |
| } |
| |
| unsigned char textureData[X_SIZE][Y_SIZE]; |
| |
| memset(textureData, 0, X_SIZE * Y_SIZE); |
| |
| GrTextureDesc desc; |
| |
| // let Skia know we will be using this texture as a render target |
| desc.fFlags = kRenderTarget_GrTextureFlagBit; |
| // 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 |
| GrTexture* texture = context->createUncachedTexture(desc, textureData, 0); |
| if (!texture) { |
| return; |
| } |
| |
| SkAutoTUnref<GrTexture> au(texture); |
| |
| // create a distinctive texture |
| for (int y = 0; y < Y_SIZE; ++y) { |
| for (int x = 0; x < X_SIZE; ++x) { |
| textureData[x][y] = x*Y_SIZE+y; |
| } |
| } |
| |
| // upload the texture |
| texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, |
| textureData, 0); |
| |
| unsigned char readback[X_SIZE][Y_SIZE]; |
| |
| // 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 |
| bool match = true; |
| |
| for (int y = 0; y < Y_SIZE; ++y) { |
| for (int x = 0; x < X_SIZE; ++x) { |
| if (textureData[x][y] != readback[x][y]) { |
| match = false; |
| } |
| } |
| } |
| |
| REPORTER_ASSERT(reporter, match); |
| |
| // Now try writing on the single channel texture |
| SkAutoTUnref<SkBaseDevice> device(SkGpuDevice::Create(texture->asRenderTarget())); |
| 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; ++y) { |
| for (int x = 0; x < X_SIZE; ++x) { |
| if (0xFF != readback[x][y]) { |
| match = false; |
| } |
| } |
| } |
| |
| REPORTER_ASSERT(reporter, match); |
| } |
| } |
| |
| #endif |