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Diffstat (limited to 'Source/WebCore/platform/graphics/qt/ImageDecoderQt.cpp')
| -rw-r--r-- | Source/WebCore/platform/graphics/qt/ImageDecoderQt.cpp | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/Source/WebCore/platform/graphics/qt/ImageDecoderQt.cpp b/Source/WebCore/platform/graphics/qt/ImageDecoderQt.cpp new file mode 100644 index 0000000..2bbb9ce --- /dev/null +++ b/Source/WebCore/platform/graphics/qt/ImageDecoderQt.cpp @@ -0,0 +1,258 @@ +/* + * Copyright (C) 2006 Friedemann Kleint <fkleint@trolltech.com> + * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies) + * + * 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. + * + * 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 "ImageDecoderQt.h" + +#include <QtCore/QByteArray> +#include <QtCore/QBuffer> + +#include <QtGui/QImageReader> +#include <qdebug.h> + +namespace WebCore { + +ImageDecoder* ImageDecoder::create(const SharedBuffer& data, ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption) +{ + // We need at least 4 bytes to figure out what kind of image we're dealing with. + if (data.size() < 4) + return 0; + + return new ImageDecoderQt(alphaOption, gammaAndColorProfileOption); +} + +ImageDecoderQt::ImageDecoderQt(ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption) + : ImageDecoder(alphaOption, gammaAndColorProfileOption) + , m_repetitionCount(cAnimationNone) +{ +} + +ImageDecoderQt::~ImageDecoderQt() +{ +} + +void ImageDecoderQt::setData(SharedBuffer* data, bool allDataReceived) +{ + if (failed()) + return; + + // No progressive loading possible + if (!allDataReceived) + return; + + // Cache our own new data. + ImageDecoder::setData(data, allDataReceived); + + // We expect to be only called once with allDataReceived + ASSERT(!m_buffer); + ASSERT(!m_reader); + + // Attempt to load the data + QByteArray imageData = QByteArray::fromRawData(m_data->data(), m_data->size()); + m_buffer.set(new QBuffer); + m_buffer->setData(imageData); + m_buffer->open(QIODevice::ReadOnly | QIODevice::Unbuffered); + m_reader.set(new QImageReader(m_buffer.get(), m_format)); + + // This will force the JPEG decoder to use JDCT_IFAST + m_reader->setQuality(49); + + // QImageReader only allows retrieving the format before reading the image + m_format = m_reader->format(); +} + +bool ImageDecoderQt::isSizeAvailable() +{ + if (!ImageDecoder::isSizeAvailable() && m_reader) + internalDecodeSize(); + + return ImageDecoder::isSizeAvailable(); +} + +size_t ImageDecoderQt::frameCount() +{ + if (m_frameBufferCache.isEmpty() && m_reader) { + if (m_reader->supportsAnimation()) { + int imageCount = m_reader->imageCount(); + + // Fixup for Qt decoders... imageCount() is wrong + // and jumpToNextImage does not work either... so + // we will have to parse everything... + if (!imageCount) + forceLoadEverything(); + else { + m_frameBufferCache.resize(imageCount); + for (size_t i = 0; i < m_frameBufferCache.size(); ++i) + m_frameBufferCache[i].setPremultiplyAlpha(m_premultiplyAlpha); + } + } else { + m_frameBufferCache.resize(1); + m_frameBufferCache[0].setPremultiplyAlpha(m_premultiplyAlpha); + } + } + + return m_frameBufferCache.size(); +} + +int ImageDecoderQt::repetitionCount() const +{ + if (m_reader && m_reader->supportsAnimation()) + m_repetitionCount = m_reader->loopCount(); + return m_repetitionCount; +} + +String ImageDecoderQt::filenameExtension() const +{ + return String(m_format.constData(), m_format.length()); +}; + +RGBA32Buffer* ImageDecoderQt::frameBufferAtIndex(size_t index) +{ + // In case the ImageDecoderQt got recreated we don't know + // yet how many images we are going to have and need to + // find that out now. + size_t count = m_frameBufferCache.size(); + if (!failed() && !count) { + internalDecodeSize(); + count = frameCount(); + } + + if (index >= count) + return 0; + + RGBA32Buffer& frame = m_frameBufferCache[index]; + if (frame.status() != RGBA32Buffer::FrameComplete && m_reader) + internalReadImage(index); + return &frame; +} + +void ImageDecoderQt::clearFrameBufferCache(size_t /*index*/) +{ +} + +void ImageDecoderQt::internalDecodeSize() +{ + ASSERT(m_reader); + + // If we have a QSize() something failed + QSize size = m_reader->size(); + if (size.isEmpty()) { + setFailed(); + return clearPointers(); + } + + setSize(size.width(), size.height()); +} + +void ImageDecoderQt::internalReadImage(size_t frameIndex) +{ + ASSERT(m_reader); + + if (m_reader->supportsAnimation()) + m_reader->jumpToImage(frameIndex); + else if (frameIndex) { + setFailed(); + return clearPointers(); + } + + if (!internalHandleCurrentImage(frameIndex)) + setFailed(); + + // Attempt to return some memory + for (int i = 0; i < m_frameBufferCache.size(); ++i) { + if (m_frameBufferCache[i].status() != RGBA32Buffer::FrameComplete) + return; + } + + clearPointers(); +} + +bool ImageDecoderQt::internalHandleCurrentImage(size_t frameIndex) +{ + QPixmap pixmap; + +#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0) + pixmap = QPixmap::fromImageReader(m_reader.get()); +#else + QImage img; + if (m_reader->read(&img)) + pixmap = QPixmap::fromImage(img); +#endif + + if (pixmap.isNull()) { + frameCount(); + repetitionCount(); + clearPointers(); + return false; + } + + // now into the RGBA32Buffer - even if the image is not + RGBA32Buffer* const buffer = &m_frameBufferCache[frameIndex]; + buffer->setRect(m_reader->currentImageRect()); + buffer->setStatus(RGBA32Buffer::FrameComplete); + buffer->setDuration(m_reader->nextImageDelay()); + buffer->setPixmap(pixmap); + return true; +} + +// The QImageIOHandler is not able to tell us how many frames +// we have and we need to parse every image. We do this by +// increasing the m_frameBufferCache by one and try to parse +// the image. We stop when QImage::read fails and then need +// to resize the m_frameBufferCache to the final size and update +// the failed bit. If we failed to decode the first image +// then we truly failed to decode, otherwise we're OK. + +// TODO: Do not increment the m_frameBufferCache.size() by one but more than one +void ImageDecoderQt::forceLoadEverything() +{ + int imageCount = 0; + + do { + m_frameBufferCache.resize(++imageCount); + } while (internalHandleCurrentImage(imageCount - 1)); + + // If we failed decoding the first image we actually + // have no images and need to set the failed bit. + // Otherwise, we want to forget about + // the last attempt to decode a image. + m_frameBufferCache.resize(imageCount - 1); + for (size_t i = 0; i < m_frameBufferCache.size(); ++i) + m_frameBufferCache[i].setPremultiplyAlpha(m_premultiplyAlpha); + if (imageCount == 1) + setFailed(); +} + +void ImageDecoderQt::clearPointers() +{ + m_reader.clear(); + m_buffer.clear(); +} +} + +// vim: ts=4 sw=4 et |