flutter_flutter/engine/platform/image-decoders/gif/GIFImageDecoderTest.cpp

/*
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 * modification, are permitted provided that the following conditions are
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#include "platform/image-decoders/gif/GIFImageDecoder.h"

#include <gtest/gtest.h>
#include "sky/engine/platform/SharedBuffer.h"
#include "sky/engine/public/platform/Platform.h"
#include "sky/engine/public/platform/WebData.h"
#include "sky/engine/public/platform/WebSize.h"
#include "sky/engine/public/platform/WebUnitTestSupport.h"
#include "sky/engine/wtf/OwnPtr.h"
#include "sky/engine/wtf/PassOwnPtr.h"
#include "sky/engine/wtf/StringHasher.h"
#include "sky/engine/wtf/Vector.h"

using namespace blink;

namespace {

PassRefPtr<SharedBuffer> readFile(const char* fileName)
{
    String filePath = Platform::current()->unitTestSupport()->webKitRootDir();
    filePath.append(fileName);

    return Platform::current()->unitTestSupport()->readFromFile(filePath);
}

PassOwnPtr<GIFImageDecoder> createDecoder()
{
    return adoptPtr(new GIFImageDecoder(ImageSource::AlphaNotPremultiplied, ImageSource::GammaAndColorProfileApplied, ImageDecoder::noDecodedImageByteLimit));
}

unsigned hashSkBitmap(const SkBitmap& bitmap)
{
    return StringHasher::hashMemory(bitmap.getPixels(), bitmap.getSize());
}

void createDecodingBaseline(SharedBuffer* data, Vector<unsigned>* baselineHashes)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();
    decoder->setData(data, true);
    size_t frameCount = decoder->frameCount();
    for (size_t i = 0; i < frameCount; ++i) {
        ImageFrame* frame = decoder->frameBufferAtIndex(i);
        baselineHashes->append(hashSkBitmap(frame->getSkBitmap()));
    }
}

void testRandomFrameDecode(const char* gifFile)
{
    SCOPED_TRACE(gifFile);

    RefPtr<SharedBuffer> fullData = readFile(gifFile);
    ASSERT_TRUE(fullData.get());
    Vector<unsigned> baselineHashes;
    createDecodingBaseline(fullData.get(), &baselineHashes);
    size_t frameCount = baselineHashes.size();

    // Random decoding should get the same results as sequential decoding.
    OwnPtr<GIFImageDecoder> decoder = createDecoder();
    decoder->setData(fullData.get(), true);
    const size_t skippingStep = 5;
    for (size_t i = 0; i < skippingStep; ++i) {
        for (size_t j = i; j < frameCount; j += skippingStep) {
            SCOPED_TRACE(testing::Message() << "Random i:" << i << " j:" << j);
            ImageFrame* frame = decoder->frameBufferAtIndex(j);
            EXPECT_EQ(baselineHashes[j], hashSkBitmap(frame->getSkBitmap()));
        }
    }

    // Decoding in reverse order.
    decoder = createDecoder();
    decoder->setData(fullData.get(), true);
    for (size_t i = frameCount; i; --i) {
        SCOPED_TRACE(testing::Message() << "Reverse i:" << i);
        ImageFrame* frame = decoder->frameBufferAtIndex(i - 1);
        EXPECT_EQ(baselineHashes[i - 1], hashSkBitmap(frame->getSkBitmap()));
    }
}

void testRandomDecodeAfterClearFrameBufferCache(const char* gifFile)
{
    SCOPED_TRACE(gifFile);

    RefPtr<SharedBuffer> data = readFile(gifFile);
    ASSERT_TRUE(data.get());
    Vector<unsigned> baselineHashes;
    createDecodingBaseline(data.get(), &baselineHashes);
    size_t frameCount = baselineHashes.size();

    OwnPtr<GIFImageDecoder> decoder = createDecoder();
    decoder->setData(data.get(), true);
    for (size_t clearExceptFrame = 0; clearExceptFrame < frameCount; ++clearExceptFrame) {
        decoder->clearCacheExceptFrame(clearExceptFrame);
        const size_t skippingStep = 5;
        for (size_t i = 0; i < skippingStep; ++i) {
            for (size_t j = 0; j < frameCount; j += skippingStep) {
                SCOPED_TRACE(testing::Message() << "Random i:" << i << " j:" << j);
                ImageFrame* frame = decoder->frameBufferAtIndex(j);
                EXPECT_EQ(baselineHashes[j], hashSkBitmap(frame->getSkBitmap()));
            }
        }
    }
}

} // namespace

TEST(GIFImageDecoderTest, decodeTwoFrames)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> data = readFile("/tests/fast/images/resources/animated.gif");
    ASSERT_TRUE(data.get());
    decoder->setData(data.get(), true);
    EXPECT_EQ(cAnimationLoopOnce, decoder->repetitionCount());

    ImageFrame* frame = decoder->frameBufferAtIndex(0);
    uint32_t generationID0 = frame->getSkBitmap().getGenerationID();
    EXPECT_EQ(ImageFrame::FrameComplete, frame->status());
    EXPECT_EQ(16, frame->getSkBitmap().width());
    EXPECT_EQ(16, frame->getSkBitmap().height());

    frame = decoder->frameBufferAtIndex(1);
    uint32_t generationID1 = frame->getSkBitmap().getGenerationID();
    EXPECT_EQ(ImageFrame::FrameComplete, frame->status());
    EXPECT_EQ(16, frame->getSkBitmap().width());
    EXPECT_EQ(16, frame->getSkBitmap().height());
    EXPECT_TRUE(generationID0 != generationID1);

    EXPECT_EQ(2u, decoder->frameCount());
    EXPECT_EQ(cAnimationLoopInfinite, decoder->repetitionCount());
}

TEST(GIFImageDecoderTest, parseAndDecode)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> data = readFile("/tests/fast/images/resources/animated.gif");
    ASSERT_TRUE(data.get());
    decoder->setData(data.get(), true);
    EXPECT_EQ(cAnimationLoopOnce, decoder->repetitionCount());

    // This call will parse the entire file.
    EXPECT_EQ(2u, decoder->frameCount());

    ImageFrame* frame = decoder->frameBufferAtIndex(0);
    EXPECT_EQ(ImageFrame::FrameComplete, frame->status());
    EXPECT_EQ(16, frame->getSkBitmap().width());
    EXPECT_EQ(16, frame->getSkBitmap().height());

    frame = decoder->frameBufferAtIndex(1);
    EXPECT_EQ(ImageFrame::FrameComplete, frame->status());
    EXPECT_EQ(16, frame->getSkBitmap().width());
    EXPECT_EQ(16, frame->getSkBitmap().height());
    EXPECT_EQ(cAnimationLoopInfinite, decoder->repetitionCount());
}

TEST(GIFImageDecoderTest, parseByteByByte)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> data = readFile("/tests/fast/images/resources/animated.gif");
    ASSERT_TRUE(data.get());

    size_t frameCount = 0;

    // Pass data to decoder byte by byte.
    for (size_t length = 1; length <= data->size(); ++length) {
        RefPtr<SharedBuffer> tempData = SharedBuffer::create(data->data(), length);
        decoder->setData(tempData.get(), length == data->size());

        EXPECT_LE(frameCount, decoder->frameCount());
        frameCount = decoder->frameCount();
    }

    EXPECT_EQ(2u, decoder->frameCount());

    decoder->frameBufferAtIndex(0);
    decoder->frameBufferAtIndex(1);
    EXPECT_EQ(cAnimationLoopInfinite, decoder->repetitionCount());
}

TEST(GIFImageDecoderTest, parseAndDecodeByteByByte)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> data = readFile("/tests/fast/images/resources/animated-gif-with-offsets.gif");
    ASSERT_TRUE(data.get());

    size_t frameCount = 0;
    size_t framesDecoded = 0;

    // Pass data to decoder byte by byte.
    for (size_t length = 1; length <= data->size(); ++length) {
        RefPtr<SharedBuffer> tempData = SharedBuffer::create(data->data(), length);
        decoder->setData(tempData.get(), length == data->size());

        EXPECT_LE(frameCount, decoder->frameCount());
        frameCount = decoder->frameCount();

        ImageFrame* frame = decoder->frameBufferAtIndex(frameCount - 1);
        if (frame && frame->status() == ImageFrame::FrameComplete && framesDecoded < frameCount)
            ++framesDecoded;
    }

    EXPECT_EQ(5u, decoder->frameCount());
    EXPECT_EQ(5u, framesDecoded);
    EXPECT_EQ(cAnimationLoopInfinite, decoder->repetitionCount());
}

TEST(GIFImageDecoderTest, brokenSecondFrame)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> data = readFile("/engine/web/tests/data/broken.gif");
    ASSERT_TRUE(data.get());
    decoder->setData(data.get(), true);

    // One frame is detected but cannot be decoded.
    EXPECT_EQ(1u, decoder->frameCount());
    ImageFrame* frame = decoder->frameBufferAtIndex(1);
    EXPECT_FALSE(frame);
}

TEST(GIFImageDecoderTest, progressiveDecode)
{
    RefPtr<SharedBuffer> fullData = readFile("/engine/web/tests/data/radient.gif");
    ASSERT_TRUE(fullData.get());
    const size_t fullLength = fullData->size();

    OwnPtr<GIFImageDecoder> decoder;
    ImageFrame* frame;

    Vector<unsigned> truncatedHashes;
    Vector<unsigned> progressiveHashes;

    // Compute hashes when the file is truncated.
    const size_t increment = 1;
    for (size_t i = 1; i <= fullLength; i += increment) {
        decoder = createDecoder();
        RefPtr<SharedBuffer> data = SharedBuffer::create(fullData->data(), i);
        decoder->setData(data.get(), i == fullLength);
        frame = decoder->frameBufferAtIndex(0);
        if (!frame) {
            truncatedHashes.append(0);
            continue;
        }
        truncatedHashes.append(hashSkBitmap(frame->getSkBitmap()));
    }

    // Compute hashes when the file is progressively decoded.
    decoder = createDecoder();
    EXPECT_EQ(cAnimationLoopOnce, decoder->repetitionCount());
    for (size_t i = 1; i <= fullLength; i += increment) {
        RefPtr<SharedBuffer> data = SharedBuffer::create(fullData->data(), i);
        decoder->setData(data.get(), i == fullLength);
        frame = decoder->frameBufferAtIndex(0);
        if (!frame) {
            progressiveHashes.append(0);
            continue;
        }
        progressiveHashes.append(hashSkBitmap(frame->getSkBitmap()));
    }
    EXPECT_EQ(cAnimationNone, decoder->repetitionCount());

    bool match = true;
    for (size_t i = 0; i < truncatedHashes.size(); ++i) {
        if (truncatedHashes[i] != progressiveHashes[i]) {
            match = false;
            break;
        }
    }
    EXPECT_TRUE(match);
}

TEST(GIFImageDecoderTest, allDataReceivedTruncation)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> data = readFile("/tests/fast/images/resources/animated.gif");
    ASSERT_TRUE(data.get());

    ASSERT_GE(data->size(), 10u);
    RefPtr<SharedBuffer> tempData = SharedBuffer::create(data->data(), data->size() - 10);
    decoder->setData(tempData.get(), true);

    EXPECT_EQ(2u, decoder->frameCount());
    EXPECT_FALSE(decoder->failed());

    decoder->frameBufferAtIndex(0);
    EXPECT_FALSE(decoder->failed());
    decoder->frameBufferAtIndex(1);
    EXPECT_TRUE(decoder->failed());
}

TEST(GIFImageDecoderTest, frameIsComplete)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> data = readFile("/tests/fast/images/resources/animated.gif");
    ASSERT_TRUE(data.get());
    decoder->setData(data.get(), true);

    EXPECT_EQ(2u, decoder->frameCount());
    EXPECT_FALSE(decoder->failed());
    EXPECT_TRUE(decoder->frameIsCompleteAtIndex(0));
    EXPECT_TRUE(decoder->frameIsCompleteAtIndex(1));
    EXPECT_EQ(cAnimationLoopInfinite, decoder->repetitionCount());
}

TEST(GIFImageDecoderTest, frameIsCompleteLoading)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> data = readFile("/tests/fast/images/resources/animated.gif");
    ASSERT_TRUE(data.get());

    ASSERT_GE(data->size(), 10u);
    RefPtr<SharedBuffer> tempData = SharedBuffer::create(data->data(), data->size() - 10);
    decoder->setData(tempData.get(), false);

    EXPECT_EQ(2u, decoder->frameCount());
    EXPECT_FALSE(decoder->failed());
    EXPECT_TRUE(decoder->frameIsCompleteAtIndex(0));
    EXPECT_FALSE(decoder->frameIsCompleteAtIndex(1));

    decoder->setData(data.get(), true);
    EXPECT_EQ(2u, decoder->frameCount());
    EXPECT_TRUE(decoder->frameIsCompleteAtIndex(0));
    EXPECT_TRUE(decoder->frameIsCompleteAtIndex(1));
}

TEST(GIFImageDecoderTest, badTerminator)
{
    RefPtr<SharedBuffer> referenceData = readFile("/engine/web/tests/data/radient.gif");
    RefPtr<SharedBuffer> testData = readFile("/engine/web/tests/data/radient-bad-terminator.gif");
    ASSERT_TRUE(referenceData.get());
    ASSERT_TRUE(testData.get());

    OwnPtr<GIFImageDecoder> referenceDecoder(createDecoder());
    referenceDecoder->setData(referenceData.get(), true);
    EXPECT_EQ(1u, referenceDecoder->frameCount());
    ImageFrame* referenceFrame = referenceDecoder->frameBufferAtIndex(0);
    ASSERT(referenceFrame);

    OwnPtr<GIFImageDecoder> testDecoder(createDecoder());
    testDecoder->setData(testData.get(), true);
    EXPECT_EQ(1u, testDecoder->frameCount());
    ImageFrame* testFrame = testDecoder->frameBufferAtIndex(0);
    ASSERT(testFrame);

    EXPECT_EQ(hashSkBitmap(referenceFrame->getSkBitmap()), hashSkBitmap(testFrame->getSkBitmap()));
}

TEST(GIFImageDecoderTest, updateRequiredPreviousFrameAfterFirstDecode)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    RefPtr<SharedBuffer> fullData = readFile("/tests/fast/images/resources/animated-10color.gif");
    ASSERT_TRUE(fullData.get());

    // Give it data that is enough to parse but not decode in order to check the status
    // of requiredPreviousFrameIndex before decoding.
    size_t partialSize = 1;
    do {
        RefPtr<SharedBuffer> data = SharedBuffer::create(fullData->data(), partialSize);
        decoder->setData(data.get(), false);
        ++partialSize;
    } while (!decoder->frameCount() || decoder->frameBufferAtIndex(0)->status() == ImageFrame::FrameEmpty);

    EXPECT_EQ(kNotFound, decoder->frameBufferAtIndex(0)->requiredPreviousFrameIndex());
    unsigned frameCount = decoder->frameCount();
    for (size_t i = 1; i < frameCount; ++i)
        EXPECT_EQ(i - 1, decoder->frameBufferAtIndex(i)->requiredPreviousFrameIndex());

    decoder->setData(fullData.get(), true);
    for (size_t i = 0; i < frameCount; ++i)
        EXPECT_EQ(kNotFound, decoder->frameBufferAtIndex(i)->requiredPreviousFrameIndex());
}

TEST(GIFImageDecoderTest, randomFrameDecode)
{
    // Single frame image.
    testRandomFrameDecode("/engine/web/tests/data/radient.gif");
    // Multiple frame images.
    testRandomFrameDecode("/tests/fast/images/resources/animated-gif-with-offsets.gif");
    testRandomFrameDecode("/tests/fast/images/resources/animated-10color.gif");
}

TEST(GIFImageDecoderTest, randomDecodeAfterClearFrameBufferCache)
{
    // Single frame image.
    testRandomDecodeAfterClearFrameBufferCache("/engine/web/tests/data/radient.gif");
    // Multiple frame images.
    testRandomDecodeAfterClearFrameBufferCache("/tests/fast/images/resources/animated-gif-with-offsets.gif");
    testRandomDecodeAfterClearFrameBufferCache("/tests/fast/images/resources/animated-10color.gif");
}

TEST(GIFImageDecoderTest, resumePartialDecodeAfterClearFrameBufferCache)
{
    RefPtr<SharedBuffer> fullData = readFile("/tests/fast/images/resources/animated-10color.gif");
    ASSERT_TRUE(fullData.get());
    Vector<unsigned> baselineHashes;
    createDecodingBaseline(fullData.get(), &baselineHashes);
    size_t frameCount = baselineHashes.size();

    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    // Let frame 0 be partially decoded.
    size_t partialSize = 1;
    do {
        RefPtr<SharedBuffer> data = SharedBuffer::create(fullData->data(), partialSize);
        decoder->setData(data.get(), false);
        ++partialSize;
    } while (!decoder->frameCount() || decoder->frameBufferAtIndex(0)->status() == ImageFrame::FrameEmpty);

    // Skip to the last frame and clear.
    decoder->setData(fullData.get(), true);
    EXPECT_EQ(frameCount, decoder->frameCount());
    ImageFrame* lastFrame = decoder->frameBufferAtIndex(frameCount - 1);
    EXPECT_EQ(baselineHashes[frameCount - 1], hashSkBitmap(lastFrame->getSkBitmap()));
    decoder->clearCacheExceptFrame(kNotFound);

    // Resume decoding of the first frame.
    ImageFrame* firstFrame = decoder->frameBufferAtIndex(0);
    EXPECT_EQ(ImageFrame::FrameComplete, firstFrame->status());
    EXPECT_EQ(baselineHashes[0], hashSkBitmap(firstFrame->getSkBitmap()));
}

// The first LZW codes in the image are invalid values that try to create a loop
// in the dictionary. Decoding should fail, but not infinitely loop or corrupt memory.
TEST(GIFImageDecoderTest, badInitialCode)
{
    RefPtr<SharedBuffer> testData = readFile("/engine/platform/image-decoders/testing/bad-initial-code.gif");
    ASSERT_TRUE(testData.get());

    OwnPtr<GIFImageDecoder> testDecoder(createDecoder());
    testDecoder->setData(testData.get(), true);
    EXPECT_EQ(1u, testDecoder->frameCount());
    ASSERT_TRUE(testDecoder->frameBufferAtIndex(0));
    EXPECT_TRUE(testDecoder->failed());
}

// The image has an invalid LZW code that exceeds dictionary size. Decoding should fail.
TEST(GIFImageDecoderTest, badCode)
{
    RefPtr<SharedBuffer> testData = readFile("/engine/platform/image-decoders/testing/bad-code.gif");
    ASSERT_TRUE(testData.get());

    OwnPtr<GIFImageDecoder> testDecoder(createDecoder());
    testDecoder->setData(testData.get(), true);
    EXPECT_EQ(1u, testDecoder->frameCount());
    ASSERT_TRUE(testDecoder->frameBufferAtIndex(0));
    EXPECT_TRUE(testDecoder->failed());
}

TEST(GIFImageDecoderTest, invalidDisposalMethod)
{
    OwnPtr<GIFImageDecoder> decoder = createDecoder();

    // The image has 2 frames, with disposal method 4 and 5, respectively.
    RefPtr<SharedBuffer> data = readFile("/engine/web/tests/data/invalid-disposal-method.gif");
    ASSERT_TRUE(data.get());
    decoder->setData(data.get(), true);

    EXPECT_EQ(2u, decoder->frameCount());
    // Disposal method 4 is converted to ImageFrame::DisposeOverwritePrevious.
    EXPECT_EQ(ImageFrame::DisposeOverwritePrevious, decoder->frameBufferAtIndex(0)->disposalMethod());
    // Disposal method 5 is ignored.
    EXPECT_EQ(ImageFrame::DisposeNotSpecified, decoder->frameBufferAtIndex(1)->disposalMethod());
}