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/*
* Copyright 2011 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 "SkCanvas.h"
#include "SkConfig8888.h"
#include "SkDevice.h"
#if SK_SUPPORT_GPU
#include "SkGpuDevice.h"
#endif
namespace {
void fillCanvas(SkCanvas* canvas, SkCanvas::Config8888 unpremulConfig) {
SkBitmap bmp;
bmp.setConfig(SkBitmap::kARGB_8888_Config, 256, 256);
bmp.allocPixels();
SkAutoLockPixels alp(bmp);
uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
for (int a = 0; a < 256; ++a) {
for (int r = 0; r < 256; ++r) {
pixels[a * 256 + r] = SkPackConfig8888(unpremulConfig, a, r, 0, 0);
}
}
canvas->writePixels(bmp, 0, 0, unpremulConfig);
}
static const SkCanvas::Config8888 gUnpremulConfigs[] = {
SkCanvas::kNative_Unpremul_Config8888,
/**
* There is a bug in Ganesh (http://code.google.com/p/skia/issues/detail?id=438)
* that causes the readback of pixels from BGRA canvas to an RGBA bitmap to
* fail. This should be removed as soon as the issue above is resolved.
*/
#if !defined(SK_BUILD_FOR_ANDROID)
SkCanvas::kBGRA_Unpremul_Config8888,
#endif
SkCanvas::kRGBA_Unpremul_Config8888,
};
void PremulAlphaRoundTripTest(skiatest::Reporter* reporter,
GrContext* context) {
SkCanvas canvas;
for (int dtype = 0; dtype < 2; ++dtype) {
if (0 == dtype) {
canvas.setDevice(new SkDevice(SkBitmap::kARGB_8888_Config,
256,
256,
false))->unref();
} else {
#if !SK_SUPPORT_GPU || defined(SK_SCALAR_IS_FIXED)
// GPU device known not to work in the fixed pt build.
continue;
#else
canvas.setDevice(new SkGpuDevice(context,
SkBitmap::kARGB_8888_Config,
256,
256))->unref();
#endif
}
SkBitmap readBmp1;
readBmp1.setConfig(SkBitmap::kARGB_8888_Config, 256, 256);
readBmp1.allocPixels();
SkBitmap readBmp2;
readBmp2.setConfig(SkBitmap::kARGB_8888_Config, 256, 256);
readBmp2.allocPixels();
for (size_t upmaIdx = 0;
upmaIdx < SK_ARRAY_COUNT(gUnpremulConfigs);
++upmaIdx) {
fillCanvas(&canvas, gUnpremulConfigs[upmaIdx]);
{
SkAutoLockPixels alp1(readBmp1);
SkAutoLockPixels alp2(readBmp2);
sk_bzero(readBmp1.getPixels(), readBmp1.getSafeSize());
sk_bzero(readBmp2.getPixels(), readBmp2.getSafeSize());
}
canvas.readPixels(&readBmp1, 0, 0, gUnpremulConfigs[upmaIdx]);
canvas.writePixels(readBmp1, 0, 0, gUnpremulConfigs[upmaIdx]);
canvas.readPixels(&readBmp2, 0, 0, gUnpremulConfigs[upmaIdx]);
SkAutoLockPixels alp1(readBmp1);
SkAutoLockPixels alp2(readBmp2);
uint32_t* pixels1 =
reinterpret_cast<uint32_t*>(readBmp1.getPixels());
uint32_t* pixels2 =
reinterpret_cast<uint32_t*>(readBmp2.getPixels());
bool success = true;
for (int y = 0; y < 256 && success; ++y) {
for (int x = 0; x < 256 && success; ++x) {
int i = y * 256 + x;
REPORTER_ASSERT(reporter, success = pixels1[i] == pixels2[i]);
}
}
}
}
}
}
#include "TestClassDef.h"
DEFINE_GPUTESTCLASS("PremulAlphaRoundTripTest", PremulAlphaRoundTripTestClass, PremulAlphaRoundTripTest)
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