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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 "Test.h"
#include "SkGpuDevice.h"
static const int X_SIZE = 12;
static const int Y_SIZE = 12;
static void ReadWriteAlphaTest(skiatest::Reporter* reporter, GrContext* context) {
#if SK_SCALAR_IS_FIXED
// GPU device known not to work in the fixed pt build.
return;
#endif
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;
}
GrAutoUnref 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
SkCanvas canvas;
canvas.setDevice(new SkGpuDevice(context, texture->asRenderTarget()))->unref();
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);
}
#include "TestClassDef.h"
DEFINE_GPUTESTCLASS("ReadWriteAlpha", ReadWriteAlphaTestClass, ReadWriteAlphaTest)
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