115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "Test.h"
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// This test is specific to the GPU backend.
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#if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID)
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#include "GrContextFactory.h"
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#include "SkGpuDevice.h"
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static const int X_SIZE = 12;
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static const int Y_SIZE = 12;
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DEF_GPUTEST(ReadWriteAlpha, reporter, factory) {
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for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
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GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type);
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if (!GrContextFactory::IsRenderingGLContext(glType)) {
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continue;
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}
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GrContext* context = factory->get(glType);
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if (NULL == context) {
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continue;
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}
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unsigned char textureData[X_SIZE][Y_SIZE];
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memset(textureData, 0, X_SIZE * Y_SIZE);
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GrSurfaceDesc desc;
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// let Skia know we will be using this texture as a render target
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desc.fFlags = kRenderTarget_GrSurfaceFlag;
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// it is a single channel texture
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desc.fConfig = kAlpha_8_GrPixelConfig;
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desc.fWidth = X_SIZE;
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desc.fHeight = Y_SIZE;
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// We are initializing the texture with zeros here
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GrTexture* texture = context->createTexture(desc, false, textureData, 0);
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if (!texture) {
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return;
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}
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SkAutoTUnref<GrTexture> au(texture);
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// create a distinctive texture
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for (int y = 0; y < Y_SIZE; ++y) {
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for (int x = 0; x < X_SIZE; ++x) {
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textureData[x][y] = x*Y_SIZE+y;
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}
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}
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// upload the texture
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texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
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textureData, 0);
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unsigned char readback[X_SIZE][Y_SIZE];
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// clear readback to something non-zero so we can detect readback failures
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memset(readback, 0x1, X_SIZE * Y_SIZE);
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// read the texture back
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texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
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readback, 0);
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// make sure the original & read back versions match
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bool match = true;
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for (int y = 0; y < Y_SIZE; ++y) {
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for (int x = 0; x < X_SIZE; ++x) {
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if (textureData[x][y] != readback[x][y]) {
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match = false;
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}
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}
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}
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REPORTER_ASSERT(reporter, match);
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// Now try writing on the single channel texture
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SkSurfaceProps props(SkSurfaceProps::kLegacyFontHost_InitType);
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SkAutoTUnref<SkBaseDevice> device(SkGpuDevice::Create(texture->asRenderTarget(), &props));
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SkCanvas canvas(device);
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SkPaint paint;
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const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10);
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paint.setColor(SK_ColorWHITE);
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canvas.drawRect(rect, paint);
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texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
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readback, 0);
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match = true;
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for (int y = 0; y < Y_SIZE; ++y) {
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for (int x = 0; x < X_SIZE; ++x) {
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if (0xFF != readback[x][y]) {
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match = false;
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}
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}
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}
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REPORTER_ASSERT(reporter, match);
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}
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}
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#endif
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