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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkColor.h"
#include "SkColorPriv.h"
#include "SkData.h"
#include "SkForceLinking.h"
#include "SkGradientShader.h"
#include "SkImageDecoder.h"
#include "SkImageEncoder.h"
#include "SkOSFile.h"
#include "SkPoint.h"
#include "SkShader.h"
#include "SkStream.h"
#include "SkString.h"
#include "Test.h"
__SK_FORCE_IMAGE_DECODER_LINKING;
/**
* Interprets c as an unpremultiplied color, and returns the
* premultiplied equivalent.
*/
static SkPMColor premultiply_unpmcolor(SkPMColor c) {
U8CPU a = SkGetPackedA32(c);
U8CPU r = SkGetPackedR32(c);
U8CPU g = SkGetPackedG32(c);
U8CPU b = SkGetPackedB32(c);
return SkPreMultiplyARGB(a, r, g, b);
}
/**
* Return true if this stream format should be skipped, due
* to do being an opaque format or not a valid format.
*/
static bool skip_image_format(SkImageDecoder::Format format) {
switch (format) {
case SkImageDecoder::kPNG_Format:
case SkImageDecoder::kWEBP_Format:
return false;
// Skip unknown since it will not be decoded anyway.
case SkImageDecoder::kUnknown_Format:
// Technically ICO and BMP supports alpha channels, but our image
// decoders do not, so skip them as well.
case SkImageDecoder::kICO_Format:
case SkImageDecoder::kBMP_Format:
// The rest of these are opaque.
case SkImageDecoder::kWBMP_Format:
case SkImageDecoder::kGIF_Format:
case SkImageDecoder::kJPEG_Format:
return true;
}
SkASSERT(false);
return true;
}
/**
* Test decoding an image in premultiplied mode and unpremultiplied mode and compare
* them.
*/
static void compare_unpremul(skiatest::Reporter* reporter, const SkString& filename) {
// Decode a resource:
SkBitmap bm8888;
SkBitmap bm8888Unpremul;
SkFILEStream stream(filename.c_str());
SkImageDecoder::Format format = SkImageDecoder::GetStreamFormat(&stream);
if (skip_image_format(format)) {
return;
}
SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(&stream));
if (NULL == decoder.get()) {
SkDebugf("couldn't decode %s\n", filename.c_str());
return;
}
bool success = decoder->decode(&stream, &bm8888, SkBitmap::kARGB_8888_Config,
SkImageDecoder::kDecodePixels_Mode);
if (!success) {
return;
}
success = stream.rewind();
REPORTER_ASSERT(reporter, success);
if (!success) {
return;
}
decoder->setRequireUnpremultipliedColors(true);
success = decoder->decode(&stream, &bm8888Unpremul, SkBitmap::kARGB_8888_Config,
SkImageDecoder::kDecodePixels_Mode);
if (!success) {
return;
}
bool dimensionsMatch = bm8888.width() == bm8888Unpremul.width()
&& bm8888.height() == bm8888Unpremul.height();
REPORTER_ASSERT(reporter, dimensionsMatch);
if (!dimensionsMatch) {
return;
}
// Only do the comparison if the two bitmaps are both 8888.
if (bm8888.config() != SkBitmap::kARGB_8888_Config
|| bm8888Unpremul.config() != SkBitmap::kARGB_8888_Config) {
return;
}
// Now compare the two bitmaps.
for (int i = 0; i < bm8888.width(); ++i) {
for (int j = 0; j < bm8888.height(); ++j) {
// "c0" is the color of the premultiplied bitmap at (i, j).
const SkPMColor c0 = *bm8888.getAddr32(i, j);
// "c1" is the result of premultiplying the color of the unpremultiplied
// bitmap at (i, j).
const SkPMColor c1 = premultiply_unpmcolor(*bm8888Unpremul.getAddr32(i, j));
// Compute the difference for each component.
int da = SkAbs32(SkGetPackedA32(c0) - SkGetPackedA32(c1));
int dr = SkAbs32(SkGetPackedR32(c0) - SkGetPackedR32(c1));
int dg = SkAbs32(SkGetPackedG32(c0) - SkGetPackedG32(c1));
int db = SkAbs32(SkGetPackedB32(c0) - SkGetPackedB32(c1));
// Alpha component must be exactly the same.
REPORTER_ASSERT(reporter, 0 == da);
// Color components may not match exactly due to rounding error.
REPORTER_ASSERT(reporter, dr <= 1);
REPORTER_ASSERT(reporter, dg <= 1);
REPORTER_ASSERT(reporter, db <= 1);
}
}
}
// Create a fake ImageDecoder to test setPrefConfigTable for
// backwards compatibility.
class PrefConfigTestingImageDecoder : public SkImageDecoder {
public:
void testPrefConfigTable(skiatest::Reporter* reporter) {
// Arbitrary list of Configs. The important thing about
// the list is that each one is different, so we can test
// to make sure the correct config is chosen.
const SkBitmap::Config configs[] = {
SkBitmap::kA1_Config,
SkBitmap::kA8_Config,
SkBitmap::kIndex8_Config,
SkBitmap::kRGB_565_Config,
SkBitmap::kARGB_4444_Config,
SkBitmap::kARGB_8888_Config,
};
this->setPrefConfigTable(configs);
REPORTER_ASSERT(reporter, configs[0] == this->getPrefConfig(kIndex_SrcDepth, false));
REPORTER_ASSERT(reporter, configs[1] == this->getPrefConfig(kIndex_SrcDepth, true));
REPORTER_ASSERT(reporter, configs[4] == this->getPrefConfig(k32Bit_SrcDepth, false));
REPORTER_ASSERT(reporter, configs[5] == this->getPrefConfig(k32Bit_SrcDepth, true));
}
protected:
virtual bool onDecode(SkStream*, SkBitmap* bitmap, Mode) SK_OVERRIDE {
return false;
}
};
static void test_pref_config_table(skiatest::Reporter* reporter) {
PrefConfigTestingImageDecoder decoder;
decoder.testPrefConfigTable(reporter);
}
static void test_unpremul(skiatest::Reporter* reporter) {
// This test cannot run if there is no resource path.
SkString resourcePath = skiatest::Test::GetResourcePath();
if (resourcePath.isEmpty()) {
return;
}
SkOSFile::Iter iter(resourcePath.c_str());
SkString basename;
if (iter.next(&basename)) {
do {
SkString filename = SkOSPath::SkPathJoin(resourcePath.c_str(), basename.c_str());
//SkDebugf("about to decode \"%s\"\n", filename.c_str());
compare_unpremul(reporter, filename);
} while (iter.next(&basename));
} else {
SkDebugf("Failed to find any files :(\n");
}
}
#ifdef SK_DEBUG
// Create a stream containing a bitmap encoded to Type type.
static SkStream* create_image_stream(SkImageEncoder::Type type) {
SkBitmap bm;
const int size = 50;
bm.setConfig(SkBitmap::kARGB_8888_Config, size, size);
bm.allocPixels();
SkCanvas canvas(bm);
SkPoint points[2] = {
{ SkIntToScalar(0), SkIntToScalar(0) },
{ SkIntToScalar(size), SkIntToScalar(size) }
};
SkColor colors[2] = { SK_ColorWHITE, SK_ColorBLUE };
SkShader* shader = SkGradientShader::CreateLinear(points, colors, NULL,
SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode);
SkPaint paint;
paint.setShader(shader)->unref();
canvas.drawPaint(paint);
// Now encode it to a stream.
SkAutoTUnref<SkData> data(SkImageEncoder::EncodeData(bm, type, 100));
if (NULL == data.get()) {
return NULL;
}
return SkNEW_ARGS(SkMemoryStream, (data.get()));
}
// For every format that supports tile based decoding, ensure that
// calling decodeSubset will not fail if the caller has unreffed the
// stream provided in buildTileIndex.
// Only runs in debug mode since we are testing for a crash.
static void test_stream_life() {
const SkImageEncoder::Type gTypes[] = {
#ifdef SK_BUILD_FOR_ANDROID
SkImageEncoder::kJPEG_Type,
SkImageEncoder::kPNG_Type,
#endif
SkImageEncoder::kWEBP_Type,
};
for (size_t i = 0; i < SK_ARRAY_COUNT(gTypes); ++i) {
//SkDebugf("encoding to %i\n", i);
SkAutoTUnref<SkStream> stream(create_image_stream(gTypes[i]));
if (NULL == stream.get()) {
SkDebugf("no stream\n");
continue;
}
SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(stream));
if (NULL == decoder.get()) {
SkDebugf("no decoder\n");
continue;
}
int width, height;
if (!decoder->buildTileIndex(stream.get(), &width, &height)) {
SkDebugf("could not build a tile index\n");
continue;
}
// Now unref the stream to make sure it survives
stream.reset(NULL);
SkBitmap bm;
decoder->decodeSubset(&bm, SkIRect::MakeWH(width, height),
SkBitmap::kARGB_8888_Config);
}
}
#endif
static void test_imageDecodingTests(skiatest::Reporter* reporter) {
test_unpremul(reporter);
test_pref_config_table(reporter);
#ifdef SK_DEBUG
test_stream_life();
#endif
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("ImageDecoding", ImageDecodingTestClass,
test_imageDecodingTests)
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