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/*
* Copyright (C) 2010 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:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 "WEBPImageDecoder.h"
#if USE(WEBP)
#include "webp/decode.h"
namespace WebCore {
WEBPImageDecoder::WEBPImageDecoder(bool premultiplyAlpha)
: ImageDecoder(premultiplyAlpha)
{
}
WEBPImageDecoder::~WEBPImageDecoder()
{
}
bool WEBPImageDecoder::isSizeAvailable()
{
if (!ImageDecoder::isSizeAvailable())
decode(true);
return ImageDecoder::isSizeAvailable();
}
RGBA32Buffer* WEBPImageDecoder::frameBufferAtIndex(size_t index)
{
if (index)
return 0;
if (m_frameBufferCache.isEmpty()) {
m_frameBufferCache.resize(1);
m_frameBufferCache[0].setPremultiplyAlpha(m_premultiplyAlpha);
}
RGBA32Buffer& frame = m_frameBufferCache[0];
if (frame.status() != RGBA32Buffer::FrameComplete)
decode(false);
return &frame;
}
bool WEBPImageDecoder::decode(bool onlySize)
{
// Minimum number of bytes needed to ensure one can parse size information.
static const size_t sizeOfHeader = 30;
// Number of bytes per pixel.
static const int bytesPerPixel = 3;
if (failed())
return false;
const size_t dataSize = m_data->buffer().size();
const uint8_t* dataBytes =
reinterpret_cast<const uint8_t*>(m_data->buffer().data());
int width, height;
if (dataSize < sizeOfHeader)
return true;
if (!WebPGetInfo(dataBytes, dataSize, &width, &height))
return setFailed();
if (onlySize)
return setSize(width, height) || setFailed();
// FIXME: Add support for progressive decoding.
if (!isAllDataReceived())
return true;
if (m_frameBufferCache.isEmpty())
return true;
RGBA32Buffer& buffer = m_frameBufferCache[0];
if (buffer.status() == RGBA32Buffer::FrameEmpty) {
ASSERT(width == size().width());
ASSERT(height == size().height());
if (!buffer.setSize(width, height))
return setFailed();
}
const int stride = width * bytesPerPixel;
Vector<uint8_t> rgb;
rgb.reserveCapacity(height * stride);
if (!WebPDecodeBGRInto(dataBytes, dataSize, &rgb[0], height * stride, stride))
return setFailed();
// FIXME: remove this data copy.
for (int y = 0; y < height; ++y) {
const uint8_t* const src = &rgb[y * stride];
for (int x = 0; x < width; ++x)
buffer.setRGBA(x, y, src[bytesPerPixel * x + 2], src[bytesPerPixel * x + 1], src[bytesPerPixel * x + 0], 0xff);
}
buffer.setStatus(RGBA32Buffer::FrameComplete);
buffer.setHasAlpha(false);
buffer.setRect(IntRect(IntPoint(), size()));
return true;
}
}
#endif
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