root/Source/platform/image-decoders/ImageDecoderTest.cpp

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DEFINITIONS

This source file includes following definitions.
  1. filenameExtension
  2. frameBufferAtIndex
  3. frameBufferCache
  4. resetRequiredPreviousFrames
  5. initFrames
  6. TEST
  7. TEST
  8. TEST
  9. TEST
  10. TEST
  11. TEST
  12. TEST
  13. TEST
  14. TEST

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#include "platform/image-decoders/ImageDecoder.h"

#include "platform/image-decoders/ImageFrame.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/Vector.h"
#include <gtest/gtest.h>

using namespace WebCore;

class TestImageDecoder : public ImageDecoder {
public:
    TestImageDecoder()
        : ImageDecoder(ImageSource::AlphaNotPremultiplied, ImageSource::GammaAndColorProfileApplied, noDecodedImageByteLimit)
    {
    }

    virtual String filenameExtension() const OVERRIDE { return ""; }
    virtual ImageFrame* frameBufferAtIndex(size_t) OVERRIDE { return 0; }

    Vector<ImageFrame, 1>& frameBufferCache()
    {
        return m_frameBufferCache;
    }

    void resetRequiredPreviousFrames(bool knownOpaque = false)
    {
        for (size_t i = 0; i < m_frameBufferCache.size(); ++i)
            m_frameBufferCache[i].setRequiredPreviousFrameIndex(findRequiredPreviousFrame(i, knownOpaque));
    }

    void initFrames(size_t numFrames, unsigned width = 100, unsigned height = 100)
    {
        setSize(width, height);
        m_frameBufferCache.resize(numFrames);
        for (size_t i = 0; i < numFrames; ++i)
            m_frameBufferCache[i].setOriginalFrameRect(IntRect(0, 0, width, height));
    }
};

TEST(ImageDecoderTest, sizeCalculationMayOverflow)
{
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    EXPECT_FALSE(decoder->setSize(1 << 29, 1));
    EXPECT_FALSE(decoder->setSize(1, 1 << 29));
    EXPECT_FALSE(decoder->setSize(1 << 15, 1 << 15));
    EXPECT_TRUE(decoder->setSize(1 << 28, 1));
    EXPECT_TRUE(decoder->setSize(1, 1 << 28));
    EXPECT_TRUE(decoder->setSize(1 << 14, 1 << 14));
}

TEST(ImageDecoderTest, requiredPreviousFrameIndex)
{
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    decoder->initFrames(6);
    Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

    frameBuffers[1].setDisposalMethod(ImageFrame::DisposeKeep);
    frameBuffers[2].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
    frameBuffers[3].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
    frameBuffers[4].setDisposalMethod(ImageFrame::DisposeKeep);

    decoder->resetRequiredPreviousFrames();

    // The first frame doesn't require any previous frame.
    EXPECT_EQ(kNotFound, frameBuffers[0].requiredPreviousFrameIndex());
    // The previous DisposeNotSpecified frame is required.
    EXPECT_EQ(0u, frameBuffers[1].requiredPreviousFrameIndex());
    // DisposeKeep is treated as DisposeNotSpecified.
    EXPECT_EQ(1u, frameBuffers[2].requiredPreviousFrameIndex());
    // Previous DisposeOverwritePrevious frames are skipped.
    EXPECT_EQ(1u, frameBuffers[3].requiredPreviousFrameIndex());
    EXPECT_EQ(1u, frameBuffers[4].requiredPreviousFrameIndex());
    EXPECT_EQ(4u, frameBuffers[5].requiredPreviousFrameIndex());
}

TEST(ImageDecoderTest, requiredPreviousFrameIndexDisposeOverwriteBgcolor)
{
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    decoder->initFrames(3);
    Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

    // Fully covering DisposeOverwriteBgcolor previous frame resets the starting state.
    frameBuffers[1].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
    decoder->resetRequiredPreviousFrames();
    EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());

    // Partially covering DisposeOverwriteBgcolor previous frame is required by this frame.
    frameBuffers[1].setOriginalFrameRect(IntRect(50, 50, 50, 50));
    decoder->resetRequiredPreviousFrames();
    EXPECT_EQ(1u, frameBuffers[2].requiredPreviousFrameIndex());
}

TEST(ImageDecoderTest, requiredPreviousFrameIndexForFrame1)
{
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    decoder->initFrames(2);
    Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

    decoder->resetRequiredPreviousFrames();
    EXPECT_EQ(0u, frameBuffers[1].requiredPreviousFrameIndex());

    // The first frame with DisposeOverwritePrevious or DisposeOverwriteBgcolor
    // resets the starting state.
    frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
    decoder->resetRequiredPreviousFrames();
    EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
    frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
    decoder->resetRequiredPreviousFrames();
    EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());

    // ... even if it partially covers.
    frameBuffers[0].setOriginalFrameRect(IntRect(50, 50, 50, 50));

    frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
    decoder->resetRequiredPreviousFrames();
    EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
    frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
    decoder->resetRequiredPreviousFrames();
    EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
}

TEST(ImageDecoderTest, requiredPreviousFrameIndexBlendAtopBgcolor)
{
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    decoder->initFrames(3);
    Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

    frameBuffers[1].setOriginalFrameRect(IntRect(25, 25, 50, 50));
    frameBuffers[2].setAlphaBlendSource(ImageFrame::BlendAtopBgcolor);

    // A full frame with 'blending method == BlendAtopBgcolor' doesn't depend on any prior frames.
    for (int disposeMethod = ImageFrame::DisposeNotSpecified; disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
        frameBuffers[1].setDisposalMethod(static_cast<ImageFrame::DisposalMethod>(disposeMethod));
        decoder->resetRequiredPreviousFrames();
        EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
    }

    // A non-full frame with 'blending method == BlendAtopBgcolor' does depend on a prior frame.
    frameBuffers[2].setOriginalFrameRect(IntRect(50, 50, 50, 50));
    for (int disposeMethod = ImageFrame::DisposeNotSpecified; disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
        frameBuffers[1].setDisposalMethod(static_cast<ImageFrame::DisposalMethod>(disposeMethod));
        decoder->resetRequiredPreviousFrames();
        EXPECT_NE(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
    }
}

TEST(ImageDecoderTest, requiredPreviousFrameIndexKnownOpaque)
{
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    decoder->initFrames(3);
    Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

    frameBuffers[1].setOriginalFrameRect(IntRect(25, 25, 50, 50));

    // A full frame that is known to be opaque doesn't depend on any prior frames.
    for (int disposeMethod = ImageFrame::DisposeNotSpecified; disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
        frameBuffers[1].setDisposalMethod(static_cast<ImageFrame::DisposalMethod>(disposeMethod));
        decoder->resetRequiredPreviousFrames(true);
        EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
    }

    // A non-full frame that is known to be opaque does depend on a prior frame.
    frameBuffers[2].setOriginalFrameRect(IntRect(50, 50, 50, 50));
    for (int disposeMethod = ImageFrame::DisposeNotSpecified; disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
        frameBuffers[1].setDisposalMethod(static_cast<ImageFrame::DisposalMethod>(disposeMethod));
        decoder->resetRequiredPreviousFrames(true);
        EXPECT_NE(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
    }
}

TEST(ImageDecoderTest, clearCacheExceptFrameDoNothing)
{
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    decoder->clearCacheExceptFrame(0);

    // This should not crash.
    decoder->initFrames(20);
    decoder->clearCacheExceptFrame(kNotFound);
}

TEST(ImageDecoderTest, clearCacheExceptFrameAll)
{
    const size_t numFrames = 10;
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    decoder->initFrames(numFrames);
    Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();
    for (size_t i = 0; i < numFrames; ++i)
        frameBuffers[i].setStatus(i % 2 ? ImageFrame::FramePartial : ImageFrame::FrameComplete);

    decoder->clearCacheExceptFrame(kNotFound);

    for (size_t i = 0; i < numFrames; ++i) {
        SCOPED_TRACE(testing::Message() << i);
        EXPECT_EQ(ImageFrame::FrameEmpty, frameBuffers[i].status());
    }
}

TEST(ImageDecoderTest, clearCacheExceptFramePreverveClearExceptFrame)
{
    const size_t numFrames = 10;
    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
    decoder->initFrames(numFrames);
    Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();
    for (size_t i = 0; i < numFrames; ++i)
        frameBuffers[i].setStatus(ImageFrame::FrameComplete);

    decoder->resetRequiredPreviousFrames();
    decoder->clearCacheExceptFrame(5);
    for (size_t i = 0; i < numFrames; ++i) {
        SCOPED_TRACE(testing::Message() << i);
        if (i == 5)
            EXPECT_EQ(ImageFrame::FrameComplete, frameBuffers[i].status());
        else
            EXPECT_EQ(ImageFrame::FrameEmpty, frameBuffers[i].status());
    }
}

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