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/*
* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp.toker@collabora.co.uk>
* Copyright (C) 2008, Google Inc. All rights reserved.
* Copyright (C) 2007-2009 Torch Mobile, Inc
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. 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 "ImageSource.h"
#if PLATFORM(QT)
#include "ImageDecoderQt.h"
#else
#include "ImageDecoder.h"
#endif
namespace WebCore {
ImageSource::ImageSource()
: m_decoder(0)
{
}
ImageSource::~ImageSource()
{
clear(true);
}
void ImageSource::clear(bool destroyAll, size_t clearBeforeFrame, SharedBuffer* data, bool allDataReceived)
{
if (!destroyAll) {
if (m_decoder)
m_decoder->clearFrameBufferCache(clearBeforeFrame);
return;
}
delete m_decoder;
m_decoder = 0;
if (data)
setData(data, allDataReceived);
}
bool ImageSource::initialized() const
{
return m_decoder;
}
void ImageSource::setData(SharedBuffer* data, bool allDataReceived)
{
// Make the decoder by sniffing the bytes.
// This method will examine the data and instantiate an instance of the appropriate decoder plugin.
// If insufficient bytes are available to determine the image type, no decoder plugin will be
// made.
if (!m_decoder) {
m_decoder = static_cast<NativeImageSourcePtr>(ImageDecoder::create(*data));
#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING)
#ifndef IMAGE_DECODER_DOWN_SAMPLING_MAX_NUMBER_OF_PIXELS
#define IMAGE_DECODER_DOWN_SAMPLING_MAX_NUMBER_OF_PIXELS (1024 * 1024)
#endif
if (m_decoder)
m_decoder->setMaxNumPixels(IMAGE_DECODER_DOWN_SAMPLING_MAX_NUMBER_OF_PIXELS);
#endif
}
if (m_decoder)
m_decoder->setData(data, allDataReceived);
}
String ImageSource::filenameExtension() const
{
return m_decoder ? m_decoder->filenameExtension() : String();
}
bool ImageSource::isSizeAvailable()
{
return m_decoder && m_decoder->isSizeAvailable();
}
IntSize ImageSource::size() const
{
return m_decoder ? m_decoder->size() : IntSize();
}
IntSize ImageSource::frameSizeAtIndex(size_t index) const
{
return m_decoder ? m_decoder->frameSizeAtIndex(index) : IntSize();
}
int ImageSource::repetitionCount()
{
return m_decoder ? m_decoder->repetitionCount() : cAnimationNone;
}
size_t ImageSource::frameCount() const
{
return m_decoder ? m_decoder->frameCount() : 0;
}
NativeImagePtr ImageSource::createFrameAtIndex(size_t index)
{
if (!m_decoder)
return 0;
RGBA32Buffer* buffer = m_decoder->frameBufferAtIndex(index);
if (!buffer || buffer->status() == RGBA32Buffer::FrameEmpty)
return 0;
// Zero-height images can cause problems for some ports. If we have an
// empty image dimension, just bail.
if (size().isEmpty())
return 0;
// Return the buffer contents as a native image. For some ports, the data
// is already in a native container, and this just increments its refcount.
return buffer->asNewNativeImage();
}
float ImageSource::frameDurationAtIndex(size_t index)
{
if (!m_decoder)
return 0;
RGBA32Buffer* buffer = m_decoder->frameBufferAtIndex(index);
if (!buffer || buffer->status() == RGBA32Buffer::FrameEmpty)
return 0;
// Many annoying ads specify a 0 duration to make an image flash as quickly
// as possible. We follow WinIE's behavior and use a duration of 100 ms
// for any frames that specify a duration of <= 50 ms. See
// <http://bugs.webkit.org/show_bug.cgi?id=14413> or Radar 4051389 for
// more.
const float duration = buffer->duration() / 1000.0f;
return (duration < 0.051f) ? 0.100f : duration;
}
bool ImageSource::frameHasAlphaAtIndex(size_t index)
{
// When a frame has not finished decoding, always mark it as having alpha.
// Ports that check the result of this function to determine their
// compositing op need this in order to not draw the undecoded portion as
// black.
// TODO: Perhaps we should ensure that each individual decoder returns true
// in this case.
return !frameIsCompleteAtIndex(index)
|| m_decoder->frameBufferAtIndex(index)->hasAlpha();
}
bool ImageSource::frameIsCompleteAtIndex(size_t index)
{
if (!m_decoder)
return false;
RGBA32Buffer* buffer = m_decoder->frameBufferAtIndex(index);
return buffer && buffer->status() == RGBA32Buffer::FrameComplete;
}
}
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