1/* 2 * Copyright (C) 2006 Friedemann Kleint <fkleint@trolltech.com> 3 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies) 4 * 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 24 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "config.h" 30#include "ImageDecoderQt.h" 31 32#include <QtCore/QByteArray> 33#include <QtCore/QBuffer> 34 35#include <QtGui/QImageReader> 36#include <qdebug.h> 37 38namespace WebCore { 39 40ImageDecoder* ImageDecoder::create(const SharedBuffer& data, ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption) 41{ 42 // We need at least 4 bytes to figure out what kind of image we're dealing with. 43 if (data.size() < 4) 44 return 0; 45 46 return new ImageDecoderQt(alphaOption, gammaAndColorProfileOption); 47} 48 49ImageDecoderQt::ImageDecoderQt(ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption) 50 : ImageDecoder(alphaOption, gammaAndColorProfileOption) 51 , m_repetitionCount(cAnimationNone) 52{ 53} 54 55ImageDecoderQt::~ImageDecoderQt() 56{ 57} 58 59void ImageDecoderQt::setData(SharedBuffer* data, bool allDataReceived) 60{ 61 if (failed()) 62 return; 63 64 // No progressive loading possible 65 if (!allDataReceived) 66 return; 67 68 // Cache our own new data. 69 ImageDecoder::setData(data, allDataReceived); 70 71 // We expect to be only called once with allDataReceived 72 ASSERT(!m_buffer); 73 ASSERT(!m_reader); 74 75 // Attempt to load the data 76 QByteArray imageData = QByteArray::fromRawData(m_data->data(), m_data->size()); 77 m_buffer.set(new QBuffer); 78 m_buffer->setData(imageData); 79 m_buffer->open(QIODevice::ReadOnly | QIODevice::Unbuffered); 80 m_reader.set(new QImageReader(m_buffer.get(), m_format)); 81 82 // This will force the JPEG decoder to use JDCT_IFAST 83 m_reader->setQuality(49); 84 85 // QImageReader only allows retrieving the format before reading the image 86 m_format = m_reader->format(); 87} 88 89bool ImageDecoderQt::isSizeAvailable() 90{ 91 if (!ImageDecoder::isSizeAvailable() && m_reader) 92 internalDecodeSize(); 93 94 return ImageDecoder::isSizeAvailable(); 95} 96 97size_t ImageDecoderQt::frameCount() 98{ 99 if (m_frameBufferCache.isEmpty() && m_reader) { 100 if (m_reader->supportsAnimation()) { 101 int imageCount = m_reader->imageCount(); 102 103 // Fixup for Qt decoders... imageCount() is wrong 104 // and jumpToNextImage does not work either... so 105 // we will have to parse everything... 106 if (!imageCount) 107 forceLoadEverything(); 108 else { 109 m_frameBufferCache.resize(imageCount); 110 for (size_t i = 0; i < m_frameBufferCache.size(); ++i) 111 m_frameBufferCache[i].setPremultiplyAlpha(m_premultiplyAlpha); 112 } 113 } else { 114 m_frameBufferCache.resize(1); 115 m_frameBufferCache[0].setPremultiplyAlpha(m_premultiplyAlpha); 116 } 117 } 118 119 return m_frameBufferCache.size(); 120} 121 122int ImageDecoderQt::repetitionCount() const 123{ 124 if (m_reader && m_reader->supportsAnimation()) 125 m_repetitionCount = m_reader->loopCount(); 126 return m_repetitionCount; 127} 128 129String ImageDecoderQt::filenameExtension() const 130{ 131 return String(m_format.constData(), m_format.length()); 132}; 133 134ImageFrame* ImageDecoderQt::frameBufferAtIndex(size_t index) 135{ 136 // In case the ImageDecoderQt got recreated we don't know 137 // yet how many images we are going to have and need to 138 // find that out now. 139 size_t count = m_frameBufferCache.size(); 140 if (!failed() && !count) { 141 internalDecodeSize(); 142 count = frameCount(); 143 } 144 145 if (index >= count) 146 return 0; 147 148 ImageFrame& frame = m_frameBufferCache[index]; 149 if (frame.status() != ImageFrame::FrameComplete && m_reader) 150 internalReadImage(index); 151 return &frame; 152} 153 154void ImageDecoderQt::clearFrameBufferCache(size_t /*index*/) 155{ 156} 157 158void ImageDecoderQt::internalDecodeSize() 159{ 160 ASSERT(m_reader); 161 162 // If we have a QSize() something failed 163 QSize size = m_reader->size(); 164 if (size.isEmpty()) { 165 setFailed(); 166 return clearPointers(); 167 } 168 169 setSize(size.width(), size.height()); 170} 171 172void ImageDecoderQt::internalReadImage(size_t frameIndex) 173{ 174 ASSERT(m_reader); 175 176 if (m_reader->supportsAnimation()) 177 m_reader->jumpToImage(frameIndex); 178 else if (frameIndex) { 179 setFailed(); 180 return clearPointers(); 181 } 182 183 if (!internalHandleCurrentImage(frameIndex)) 184 setFailed(); 185 186 // Attempt to return some memory 187 for (int i = 0; i < m_frameBufferCache.size(); ++i) { 188 if (m_frameBufferCache[i].status() != ImageFrame::FrameComplete) 189 return; 190 } 191 192 clearPointers(); 193} 194 195bool ImageDecoderQt::internalHandleCurrentImage(size_t frameIndex) 196{ 197 QPixmap pixmap = QPixmap::fromImageReader(m_reader.get()); 198 199 if (pixmap.isNull()) { 200 frameCount(); 201 repetitionCount(); 202 clearPointers(); 203 return false; 204 } 205 206 // now into the ImageFrame - even if the image is not 207 ImageFrame* const buffer = &m_frameBufferCache[frameIndex]; 208 buffer->setOriginalFrameRect(m_reader->currentImageRect()); 209 buffer->setStatus(ImageFrame::FrameComplete); 210 buffer->setDuration(m_reader->nextImageDelay()); 211 buffer->setPixmap(pixmap); 212 return true; 213} 214 215// The QImageIOHandler is not able to tell us how many frames 216// we have and we need to parse every image. We do this by 217// increasing the m_frameBufferCache by one and try to parse 218// the image. We stop when QImage::read fails and then need 219// to resize the m_frameBufferCache to the final size and update 220// the failed bit. If we failed to decode the first image 221// then we truly failed to decode, otherwise we're OK. 222 223// TODO: Do not increment the m_frameBufferCache.size() by one but more than one 224void ImageDecoderQt::forceLoadEverything() 225{ 226 int imageCount = 0; 227 228 do { 229 m_frameBufferCache.resize(++imageCount); 230 } while (internalHandleCurrentImage(imageCount - 1)); 231 232 // If we failed decoding the first image we actually 233 // have no images and need to set the failed bit. 234 // Otherwise, we want to forget about 235 // the last attempt to decode a image. 236 m_frameBufferCache.resize(imageCount - 1); 237 for (size_t i = 0; i < m_frameBufferCache.size(); ++i) 238 m_frameBufferCache[i].setPremultiplyAlpha(m_premultiplyAlpha); 239 if (imageCount == 1) 240 setFailed(); 241} 242 243void ImageDecoderQt::clearPointers() 244{ 245 m_reader.clear(); 246 m_buffer.clear(); 247} 248} 249 250// vim: ts=4 sw=4 et 251