d79277f678
Previously we only supported it for the framework. Making this change allows us to test subset decoding in skimage, to make sure we don't break it. Will require rebaselining android skimage results. R=djsollen@google.com Review URL: https://codereview.chromium.org/21612003 git-svn-id: http://skia.googlecode.com/svn/trunk@10625 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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