/*

 * 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)