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Diffstat (limited to 'WebCore/platform/graphics/ImageSource.cpp')
| -rw-r--r-- | WebCore/platform/graphics/ImageSource.cpp | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/WebCore/platform/graphics/ImageSource.cpp b/WebCore/platform/graphics/ImageSource.cpp new file mode 100644 index 0000000..3bea57f --- /dev/null +++ b/WebCore/platform/graphics/ImageSource.cpp @@ -0,0 +1,240 @@ +/* + * 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" + +#include "BMPImageDecoder.h" +#include "GIFImageDecoder.h" +#include "ICOImageDecoder.h" +#include "JPEGImageDecoder.h" +#include "PNGImageDecoder.h" +#include "SharedBuffer.h" +#include "XBMImageDecoder.h" + +#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 +#endif + +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(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 = createDecoder(data->buffer()); +#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING) + 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() +{ + if (!m_decoder) + return false; + + return m_decoder->isSizeAvailable(); +} + +IntSize ImageSource::size() const +{ + if (!m_decoder) + return IntSize(); + + return m_decoder->size(); +} + +IntSize ImageSource::frameSizeAtIndex(size_t index) const +{ + if (!m_decoder) + return IntSize(); + + return m_decoder->frameSizeAtIndex(index); +} + +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; + + // 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(); +} + +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) +{ + // 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() : true; +} + +} |