1 /* 2 * Copyright (C) 2006 Friedemann Kleint <fkleint (at) 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 38 namespace WebCore { 39 40 ImageDecoder* ImageDecoder::create(const SharedBuffer& data) 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; 47 } 48 49 ImageDecoderQt::ImageDecoderQt() 50 : m_repetitionCount(cAnimationNone) 51 { 52 } 53 54 ImageDecoderQt::~ImageDecoderQt() 55 { 56 } 57 58 void ImageDecoderQt::setData(SharedBuffer* data, bool allDataReceived) 59 { 60 if (m_failed) 61 return; 62 63 // No progressive loading possible 64 if (!allDataReceived) 65 return; 66 67 // Cache our own new data. 68 ImageDecoder::setData(data, allDataReceived); 69 70 // We expect to be only called once with allDataReceived 71 ASSERT(!m_buffer); 72 ASSERT(!m_reader); 73 74 // Attempt to load the data 75 QByteArray imageData = QByteArray::fromRawData(m_data->data(), m_data->size()); 76 m_buffer.set(new QBuffer); 77 m_buffer->setData(imageData); 78 m_buffer->open(QBuffer::ReadOnly); 79 m_reader.set(new QImageReader(m_buffer.get(), m_format)); 80 81 // This will force the JPEG decoder to use JDCT_IFAST 82 m_reader->setQuality(49); 83 84 // QImageReader only allows retrieving the format before reading the image 85 m_format = m_reader->format(); 86 } 87 88 bool ImageDecoderQt::isSizeAvailable() 89 { 90 if (!ImageDecoder::isSizeAvailable() && m_reader) 91 internalDecodeSize(); 92 93 return ImageDecoder::isSizeAvailable(); 94 } 95 96 size_t ImageDecoderQt::frameCount() 97 { 98 if (m_frameBufferCache.isEmpty() && m_reader) { 99 if (m_reader->supportsAnimation()) { 100 int imageCount = m_reader->imageCount(); 101 102 // Fixup for Qt decoders... imageCount() is wrong 103 // and jumpToNextImage does not work either... so 104 // we will have to parse everything... 105 if (imageCount == 0) 106 forceLoadEverything(); 107 else 108 m_frameBufferCache.resize(imageCount); 109 } else { 110 m_frameBufferCache.resize(1); 111 } 112 } 113 114 return m_frameBufferCache.size(); 115 } 116 117 int ImageDecoderQt::repetitionCount() const 118 { 119 if (m_reader && m_reader->supportsAnimation()) 120 m_repetitionCount = qMax(0, m_reader->loopCount()); 121 122 return m_repetitionCount; 123 } 124 125 String ImageDecoderQt::filenameExtension() const 126 { 127 return String(m_format.constData(), m_format.length()); 128 }; 129 130 RGBA32Buffer* ImageDecoderQt::frameBufferAtIndex(size_t index) 131 { 132 // In case the ImageDecoderQt got recreated we don't know 133 // yet how many images we are going to have and need to 134 // find that out now. 135 int count = m_frameBufferCache.size(); 136 if (!m_failed && count == 0) { 137 internalDecodeSize(); 138 count = frameCount(); 139 } 140 141 if (index >= static_cast<size_t>(count)) 142 return 0; 143 144 RGBA32Buffer& frame = m_frameBufferCache[index]; 145 if (frame.status() != RGBA32Buffer::FrameComplete && m_reader) 146 internalReadImage(index); 147 return &frame; 148 } 149 150 void ImageDecoderQt::clearFrameBufferCache(size_t /*index*/) 151 { 152 } 153 154 void ImageDecoderQt::internalDecodeSize() 155 { 156 ASSERT(m_reader); 157 158 // If we have a QSize() something failed 159 QSize size = m_reader->size(); 160 if (size.isEmpty()) 161 return failRead(); 162 163 setSize(size.width(), size.height()); 164 } 165 166 void ImageDecoderQt::internalReadImage(size_t frameIndex) 167 { 168 ASSERT(m_reader); 169 170 if (m_reader->supportsAnimation()) 171 m_reader->jumpToImage(frameIndex); 172 else if (frameIndex != 0) 173 return failRead(); 174 175 internalHandleCurrentImage(frameIndex); 176 177 // Attempt to return some memory 178 for (int i = 0; i < m_frameBufferCache.size(); ++i) 179 if (m_frameBufferCache[i].status() != RGBA32Buffer::FrameComplete) 180 return; 181 182 m_reader.clear(); 183 m_buffer.clear(); 184 } 185 186 void ImageDecoderQt::internalHandleCurrentImage(size_t frameIndex) 187 { 188 // Now get the QImage from Qt and place it in the RGBA32Buffer 189 QImage img; 190 if (!m_reader->read(&img)) 191 return failRead(); 192 193 // now into the RGBA32Buffer - even if the image is not 194 QSize imageSize = img.size(); 195 RGBA32Buffer* const buffer = &m_frameBufferCache[frameIndex]; 196 buffer->setRect(m_reader->currentImageRect()); 197 buffer->setStatus(RGBA32Buffer::FrameComplete); 198 buffer->setDuration(m_reader->nextImageDelay()); 199 buffer->setDecodedImage(img); 200 } 201 202 // The QImageIOHandler is not able to tell us how many frames 203 // we have and we need to parse every image. We do this by 204 // increasing the m_frameBufferCache by one and try to parse 205 // the image. We stop when QImage::read fails and then need 206 // to resize the m_frameBufferCache to the final size and update 207 // the m_failed. In case we failed to decode the first image 208 // we want to keep m_failed set to true. 209 210 // TODO: Do not increment the m_frameBufferCache.size() by one but more than one 211 void ImageDecoderQt::forceLoadEverything() 212 { 213 int imageCount = 0; 214 215 do { 216 m_frameBufferCache.resize(++imageCount); 217 internalHandleCurrentImage(imageCount - 1); 218 } while(!m_failed); 219 220 // If we failed decoding the first image we actually 221 // have no images and need to keep m_failed set to 222 // true otherwise we want to reset it and forget about 223 // the last attempt to decode a image. 224 m_frameBufferCache.resize(imageCount - 1); 225 m_failed = imageCount == 1; 226 } 227 228 void ImageDecoderQt::failRead() 229 { 230 setFailed(); 231 m_reader.clear(); 232 m_buffer.clear(); 233 } 234 } 235 236 // vim: ts=4 sw=4 et 237
