Source/core/platform/image-decoders/jpeg/JPEGImageDecoderTest.cpp

/*
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#include "config.h"

#include "core/platform/image-decoders/jpeg/JPEGImageDecoder.h"

#include "core/platform/SharedBuffer.h"
#include "public/platform/Platform.h"
#include "public/platform/WebData.h"
#include "public/platform/WebSize.h"
#include "public/platform/WebUnitTestSupport.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/StringHasher.h"
#include "wtf/Vector.h"

#include <gtest/gtest.h>

using namespace WebCore;
using namespace WebKit;

namespace {

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

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

PassOwnPtr<JPEGImageDecoder> createDecoder(size_t maxDecodedBytes)
{
    return adoptPtr(new JPEGImageDecoder(ImageSource::AlphaNotPremultiplied, ImageSource::GammaAndColorProfileApplied, maxDecodedBytes));
}

} // namespace

void downsample(size_t maxDecodedBytes, unsigned* outputWidth, unsigned* outputHeight)
{
    RefPtr<SharedBuffer> data = readFile("/LayoutTests/fast/images/resources/lenna.jpg");
    ASSERT_TRUE(data.get());

    OwnPtr<JPEGImageDecoder> decoder = createDecoder(maxDecodedBytes);
    decoder->setData(data.get(), true);

    ImageFrame* frame = decoder->frameBufferAtIndex(0);
    ASSERT_TRUE(frame);
    *outputWidth = frame->getSkBitmap().width();
    *outputHeight = frame->getSkBitmap().height();
    EXPECT_EQ(IntSize(*outputWidth, *outputHeight), decoder->decodedSize());
}

// Tests failure on a too big image.
TEST(JPEGImageDecoderTest, tooBig)
{
    OwnPtr<JPEGImageDecoder> decoder = createDecoder(100);
    EXPECT_FALSE(decoder->setSize(10000, 10000));
    EXPECT_TRUE(decoder->failed());
}

// Tests that JPEG decoder can downsample from 1/8 to 7/8.
TEST(JPEGImageDecoderTest, downsample1Over8To7Over8)
{
    unsigned outputWidth, outputHeight;

    // 1/8 downsample.
    downsample(40 * 40 * 4, &outputWidth, &outputHeight);
    EXPECT_EQ(32u, outputWidth);
    EXPECT_EQ(32u, outputHeight);

    // 2/8 downsample.
    downsample(70 * 70 * 4, &outputWidth, &outputHeight);
    EXPECT_EQ(64u, outputWidth);
    EXPECT_EQ(64u, outputHeight);

    // 3/8 downsample.
    downsample(100 * 100 * 4, &outputWidth, &outputHeight);
    EXPECT_EQ(96u, outputWidth);
    EXPECT_EQ(96u, outputHeight);

    // 4/8 downsample.
    downsample(130 * 130 * 4, &outputWidth, &outputHeight);
    EXPECT_EQ(128u, outputWidth);
    EXPECT_EQ(128u, outputHeight);

    // 5/8 downsample.
    downsample(170 * 170 * 4, &outputWidth, &outputHeight);
    EXPECT_EQ(160u, outputWidth);
    EXPECT_EQ(160u, outputHeight);

    // 6/8 downsample.
    downsample(200 * 200 * 4, &outputWidth, &outputHeight);
    EXPECT_EQ(192u, outputWidth);
    EXPECT_EQ(192u, outputHeight);

    // 7/8 downsample.
    downsample(230 * 230 * 4, &outputWidth, &outputHeight);
    EXPECT_EQ(224u, outputWidth);
    EXPECT_EQ(224u, outputHeight);
}

// Tests that upsampling is not allowed.
TEST(JPEGImageDecoderTest, upsample)
{
    unsigned outputWidth, outputHeight;
    downsample(1000 * 1000, &outputWidth, &outputHeight);
    EXPECT_EQ(256u, outputWidth);
    EXPECT_EQ(256u, outputHeight);
}