/*
* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp.toker@collabora.co.uk>
*
* 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"
#include "SharedBuffer.h"
#if PLATFORM(CAIRO)
#include "GIFImageDecoder.h"
#include "JPEGImageDecoder.h"
#include "PNGImageDecoder.h"
#include "BMPImageDecoder.h"
#include "ICOImageDecoder.h"
#include "XBMImageDecoder.h"
#include <cairo.h>
namespace WebCore {
ImageDecoder* createDecoder(const Vector<char>& data)
{
// We need at least 4 bytes to figure out what kind of image we're dealing with.
int length = data.size();
if (length < 4)
return 0;
const unsigned char* uContents = (const unsigned char*)data.data();
const char* contents = data.data();
// GIFs begin with GIF8(7 or 9).
if (strncmp(contents, "GIF8", 4) == 0)
return new GIFImageDecoder();
// Test for PNG.
if (uContents[0]==0x89 &&
uContents[1]==0x50 &&
uContents[2]==0x4E &&
uContents[3]==0x47)
return new PNGImageDecoder();
// JPEG
if (uContents[0]==0xFF &&
uContents[1]==0xD8 &&
uContents[2]==0xFF)
return new JPEGImageDecoder();
// BMP
if (strncmp(contents, "BM", 2) == 0)
return new BMPImageDecoder();
// ICOs always begin with a 2-byte 0 followed by a 2-byte 1.
// CURs begin with 2-byte 0 followed by 2-byte 2.
if (!memcmp(contents, "\000\000\001\000", 4) ||
!memcmp(contents, "\000\000\002\000", 4))
return new ICOImageDecoder();
// XBMs require 8 bytes of info.
if (length >= 8 && strncmp(contents, "#define ", 8) == 0)
return new XBMImageDecoder();
// Give up. We don't know what the heck this is.
return 0;
}
ImageSource::ImageSource()
: m_decoder(0)
{}
ImageSource::~ImageSource()
{
clear();
}
void ImageSource::clear()
{
delete m_decoder;
m_decoder = 0;
}
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.
delete m_decoder;
m_decoder = createDecoder(data->buffer());
if (!m_decoder)
return;
m_decoder->setData(data, allDataReceived);
}
bool ImageSource::isSizeAvailable()
{
if (!m_decoder)
return false;
return m_decoder->isSizeAvailable();
}
IntSize ImageSource::size() const
{
if (!m_decoder)
return IntSize();
return m_decoder->size();
}
int ImageSource::repetitionCount()
{
if (!m_decoder)
return cAnimationNone;
return m_decoder->repetitionCount();
}
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;
return cairo_image_surface_create_for_data((unsigned char*)buffer->bytes().data(),
CAIRO_FORMAT_ARGB32,
size().width(),
buffer->height(),
size().width()*4);
}
bool ImageSource::frameIsCompleteAtIndex(size_t index)
{
if (!m_decoder)
return false;
RGBA32Buffer* buffer = m_decoder->frameBufferAtIndex(index);
return buffer && buffer->status() == RGBA32Buffer::FrameComplete;
}
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)
{
if (!m_decoder || !m_decoder->supportsAlpha())
return false;
RGBA32Buffer* buffer = m_decoder->frameBufferAtIndex(index);
if (!buffer || buffer->status() == RGBA32Buffer::FrameEmpty)
return false;
return buffer->hasAlpha();
}
}
#endif // PLATFORM(CAIRO)