9dfac2366d
This output is for debugging purposes, and does not report an error. BUG=skia:1616 Review URL: https://codereview.chromium.org/24110003 git-svn-id: http://skia.googlecode.com/svn/trunk@11292 2bbb7eff-a529-9590-31e7-b0007b416f81
271 lines
9.1 KiB
C++
271 lines
9.1 KiB
C++
/*
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* Copyright 2013 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 "SkBitmap.h"
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#include "SkCanvas.h"
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#include "SkColor.h"
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#include "SkColorPriv.h"
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#include "SkData.h"
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#include "SkForceLinking.h"
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#include "SkGradientShader.h"
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#include "SkImageDecoder.h"
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#include "SkImageEncoder.h"
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#include "SkOSFile.h"
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#include "SkPoint.h"
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#include "SkShader.h"
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#include "SkStream.h"
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#include "SkString.h"
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#include "Test.h"
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__SK_FORCE_IMAGE_DECODER_LINKING;
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/**
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* Interprets c as an unpremultiplied color, and returns the
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* premultiplied equivalent.
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*/
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static SkPMColor premultiply_unpmcolor(SkPMColor c) {
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U8CPU a = SkGetPackedA32(c);
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U8CPU r = SkGetPackedR32(c);
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U8CPU g = SkGetPackedG32(c);
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U8CPU b = SkGetPackedB32(c);
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return SkPreMultiplyARGB(a, r, g, b);
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}
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/**
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* Return true if this stream format should be skipped, due
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* to do being an opaque format or not a valid format.
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*/
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static bool skip_image_format(SkImageDecoder::Format format) {
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switch (format) {
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case SkImageDecoder::kPNG_Format:
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case SkImageDecoder::kWEBP_Format:
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return false;
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// Skip unknown since it will not be decoded anyway.
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case SkImageDecoder::kUnknown_Format:
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// Technically ICO and BMP supports alpha channels, but our image
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// decoders do not, so skip them as well.
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case SkImageDecoder::kICO_Format:
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case SkImageDecoder::kBMP_Format:
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// The rest of these are opaque.
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case SkImageDecoder::kWBMP_Format:
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case SkImageDecoder::kGIF_Format:
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case SkImageDecoder::kJPEG_Format:
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return true;
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}
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SkASSERT(false);
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return true;
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}
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/**
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* Test decoding an image in premultiplied mode and unpremultiplied mode and compare
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* them.
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*/
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static void compare_unpremul(skiatest::Reporter* reporter, const SkString& filename) {
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// Decode a resource:
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SkBitmap bm8888;
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SkBitmap bm8888Unpremul;
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SkFILEStream stream(filename.c_str());
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SkImageDecoder::Format format = SkImageDecoder::GetStreamFormat(&stream);
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if (skip_image_format(format)) {
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return;
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}
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SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(&stream));
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if (NULL == decoder.get()) {
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SkDebugf("couldn't decode %s\n", filename.c_str());
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return;
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}
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bool success = decoder->decode(&stream, &bm8888, SkBitmap::kARGB_8888_Config,
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SkImageDecoder::kDecodePixels_Mode);
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if (!success) {
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return;
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}
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success = stream.rewind();
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REPORTER_ASSERT(reporter, success);
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if (!success) {
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return;
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}
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decoder->setRequireUnpremultipliedColors(true);
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success = decoder->decode(&stream, &bm8888Unpremul, SkBitmap::kARGB_8888_Config,
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SkImageDecoder::kDecodePixels_Mode);
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if (!success) {
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return;
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}
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bool dimensionsMatch = bm8888.width() == bm8888Unpremul.width()
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&& bm8888.height() == bm8888Unpremul.height();
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REPORTER_ASSERT(reporter, dimensionsMatch);
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if (!dimensionsMatch) {
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return;
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}
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// Only do the comparison if the two bitmaps are both 8888.
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if (bm8888.config() != SkBitmap::kARGB_8888_Config
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|| bm8888Unpremul.config() != SkBitmap::kARGB_8888_Config) {
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return;
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}
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// Now compare the two bitmaps.
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for (int i = 0; i < bm8888.width(); ++i) {
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for (int j = 0; j < bm8888.height(); ++j) {
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// "c0" is the color of the premultiplied bitmap at (i, j).
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const SkPMColor c0 = *bm8888.getAddr32(i, j);
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// "c1" is the result of premultiplying the color of the unpremultiplied
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// bitmap at (i, j).
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const SkPMColor c1 = premultiply_unpmcolor(*bm8888Unpremul.getAddr32(i, j));
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// Compute the difference for each component.
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int da = SkAbs32(SkGetPackedA32(c0) - SkGetPackedA32(c1));
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int dr = SkAbs32(SkGetPackedR32(c0) - SkGetPackedR32(c1));
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int dg = SkAbs32(SkGetPackedG32(c0) - SkGetPackedG32(c1));
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int db = SkAbs32(SkGetPackedB32(c0) - SkGetPackedB32(c1));
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// Alpha component must be exactly the same.
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REPORTER_ASSERT(reporter, 0 == da);
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// Color components may not match exactly due to rounding error.
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REPORTER_ASSERT(reporter, dr <= 1);
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REPORTER_ASSERT(reporter, dg <= 1);
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REPORTER_ASSERT(reporter, db <= 1);
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}
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}
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}
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// Create a fake ImageDecoder to test setPrefConfigTable for
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// backwards compatibility.
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class PrefConfigTestingImageDecoder : public SkImageDecoder {
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public:
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void testPrefConfigTable(skiatest::Reporter* reporter) {
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// Arbitrary list of Configs. The important thing about
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// the list is that each one is different, so we can test
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// to make sure the correct config is chosen.
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const SkBitmap::Config configs[] = {
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SkBitmap::kA1_Config,
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SkBitmap::kA8_Config,
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SkBitmap::kIndex8_Config,
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SkBitmap::kRGB_565_Config,
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SkBitmap::kARGB_4444_Config,
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SkBitmap::kARGB_8888_Config,
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};
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this->setPrefConfigTable(configs);
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REPORTER_ASSERT(reporter, configs[0] == this->getPrefConfig(kIndex_SrcDepth, false));
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REPORTER_ASSERT(reporter, configs[1] == this->getPrefConfig(kIndex_SrcDepth, true));
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REPORTER_ASSERT(reporter, configs[4] == this->getPrefConfig(k32Bit_SrcDepth, false));
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REPORTER_ASSERT(reporter, configs[5] == this->getPrefConfig(k32Bit_SrcDepth, true));
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}
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protected:
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virtual bool onDecode(SkStream*, SkBitmap* bitmap, Mode) SK_OVERRIDE {
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return false;
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}
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};
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static void test_pref_config_table(skiatest::Reporter* reporter) {
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PrefConfigTestingImageDecoder decoder;
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decoder.testPrefConfigTable(reporter);
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}
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static void test_unpremul(skiatest::Reporter* reporter) {
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// This test cannot run if there is no resource path.
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SkString resourcePath = skiatest::Test::GetResourcePath();
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if (resourcePath.isEmpty()) {
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return;
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}
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SkOSFile::Iter iter(resourcePath.c_str());
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SkString basename;
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if (iter.next(&basename)) {
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do {
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SkString filename = SkOSPath::SkPathJoin(resourcePath.c_str(), basename.c_str());
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//SkDebugf("about to decode \"%s\"\n", filename.c_str());
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compare_unpremul(reporter, filename);
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} while (iter.next(&basename));
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} else {
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SkDebugf("Failed to find any files :(\n");
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}
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}
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#ifdef SK_DEBUG
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// Create a stream containing a bitmap encoded to Type type.
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static SkStream* create_image_stream(SkImageEncoder::Type type) {
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SkBitmap bm;
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const int size = 50;
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bm.setConfig(SkBitmap::kARGB_8888_Config, size, size);
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bm.allocPixels();
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SkCanvas canvas(bm);
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SkPoint points[2] = {
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{ SkIntToScalar(0), SkIntToScalar(0) },
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{ SkIntToScalar(size), SkIntToScalar(size) }
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};
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SkColor colors[2] = { SK_ColorWHITE, SK_ColorBLUE };
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SkShader* shader = SkGradientShader::CreateLinear(points, colors, NULL,
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SK_ARRAY_COUNT(colors),
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SkShader::kClamp_TileMode);
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SkPaint paint;
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paint.setShader(shader)->unref();
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canvas.drawPaint(paint);
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// Now encode it to a stream.
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SkAutoTUnref<SkData> data(SkImageEncoder::EncodeData(bm, type, 100));
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if (NULL == data.get()) {
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return NULL;
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}
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return SkNEW_ARGS(SkMemoryStream, (data.get()));
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}
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// For every format that supports tile based decoding, ensure that
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// calling decodeSubset will not fail if the caller has unreffed the
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// stream provided in buildTileIndex.
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// Only runs in debug mode since we are testing for a crash.
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static void test_stream_life() {
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const SkImageEncoder::Type gTypes[] = {
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#ifdef SK_BUILD_FOR_ANDROID
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SkImageEncoder::kJPEG_Type,
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SkImageEncoder::kPNG_Type,
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#endif
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SkImageEncoder::kWEBP_Type,
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};
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for (size_t i = 0; i < SK_ARRAY_COUNT(gTypes); ++i) {
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//SkDebugf("encoding to %i\n", i);
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SkAutoTUnref<SkStream> stream(create_image_stream(gTypes[i]));
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if (NULL == stream.get()) {
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SkDebugf("no stream\n");
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continue;
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}
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SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(stream));
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if (NULL == decoder.get()) {
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SkDebugf("no decoder\n");
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continue;
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}
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int width, height;
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if (!decoder->buildTileIndex(stream.get(), &width, &height)) {
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SkDebugf("could not build a tile index\n");
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continue;
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}
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// Now unref the stream to make sure it survives
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stream.reset(NULL);
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SkBitmap bm;
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decoder->decodeSubset(&bm, SkIRect::MakeWH(width, height),
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SkBitmap::kARGB_8888_Config);
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}
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}
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#endif
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static void test_imageDecodingTests(skiatest::Reporter* reporter) {
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test_unpremul(reporter);
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test_pref_config_table(reporter);
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#ifdef SK_DEBUG
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test_stream_life();
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#endif
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}
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#include "TestClassDef.h"
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DEFINE_TESTCLASS("ImageDecoding", ImageDecodingTestClass,
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test_imageDecodingTests)
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