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/QBuffer>
33#include <QtCore/QByteArray>
34#include <QtGui/QImageReader>
35
36namespace WebCore {
37
38ImageDecoderQt::ImageDecoderQt(ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption)
39    : ImageDecoder(alphaOption, gammaAndColorProfileOption)
40    , m_repetitionCount(cAnimationNone)
41{
42}
43
44ImageDecoderQt::~ImageDecoderQt()
45{
46}
47
48void ImageDecoderQt::setData(SharedBuffer* data, bool allDataReceived)
49{
50    if (failed())
51        return;
52
53    // No progressive loading possible
54    if (!allDataReceived)
55        return;
56
57    // Cache our own new data.
58    ImageDecoder::setData(data, allDataReceived);
59
60    // We expect to be only called once with allDataReceived
61    ASSERT(!m_buffer);
62    ASSERT(!m_reader);
63
64    // Attempt to load the data
65    QByteArray imageData = QByteArray::fromRawData(m_data->data(), m_data->size());
66    m_buffer = adoptPtr(new QBuffer);
67    m_buffer->setData(imageData);
68    m_buffer->open(QIODevice::ReadOnly | QIODevice::Unbuffered);
69    m_reader = adoptPtr(new QImageReader(m_buffer.get(), m_format));
70
71    // This will force the JPEG decoder to use JDCT_IFAST
72    m_reader->setQuality(49);
73
74    // QImageReader only allows retrieving the format before reading the image
75    m_format = m_reader->format();
76}
77
78bool ImageDecoderQt::isSizeAvailable()
79{
80    if (!ImageDecoder::isSizeAvailable() && m_reader)
81        internalDecodeSize();
82
83    return ImageDecoder::isSizeAvailable();
84}
85
86size_t ImageDecoderQt::frameCount()
87{
88    if (m_frameBufferCache.isEmpty() && m_reader) {
89        if (m_reader->supportsAnimation()) {
90            int imageCount = m_reader->imageCount();
91
92            // Fixup for Qt decoders... imageCount() is wrong
93            // and jumpToNextImage does not work either... so
94            // we will have to parse everything...
95            if (!imageCount)
96                forceLoadEverything();
97            else {
98                m_frameBufferCache.resize(imageCount);
99                for (size_t i = 0; i < m_frameBufferCache.size(); ++i)
100                    m_frameBufferCache[i].setPremultiplyAlpha(m_premultiplyAlpha);
101            }
102        } else {
103            m_frameBufferCache.resize(1);
104            m_frameBufferCache[0].setPremultiplyAlpha(m_premultiplyAlpha);
105        }
106    }
107
108    return m_frameBufferCache.size();
109}
110
111int ImageDecoderQt::repetitionCount() const
112{
113    if (m_reader && m_reader->supportsAnimation())
114        m_repetitionCount = m_reader->loopCount();
115    return m_repetitionCount;
116}
117
118String ImageDecoderQt::filenameExtension() const
119{
120    return String(m_format.constData(), m_format.length());
121}
122
123ImageFrame* ImageDecoderQt::frameBufferAtIndex(size_t index)
124{
125    // In case the ImageDecoderQt got recreated we don't know
126    // yet how many images we are going to have and need to
127    // find that out now.
128    size_t count = m_frameBufferCache.size();
129    if (!failed() && !count) {
130        internalDecodeSize();
131        count = frameCount();
132    }
133
134    if (index >= count)
135        return 0;
136
137    ImageFrame& frame = m_frameBufferCache[index];
138    if (frame.status() != ImageFrame::FrameComplete && m_reader)
139        internalReadImage(index);
140    return &frame;
141}
142
143void ImageDecoderQt::clearFrameBufferCache(size_t /*index*/)
144{
145}
146
147void ImageDecoderQt::internalDecodeSize()
148{
149    ASSERT(m_reader);
150
151    // If we have a QSize() something failed
152    QSize size = m_reader->size();
153    if (size.isEmpty()) {
154        setFailed();
155        return clearPointers();
156    }
157
158    setSize(size.width(), size.height());
159
160    // We don't need the tables set by prepareScaleDataIfNecessary,
161    // but their dimensions are used by ImageDecoder::scaledSize().
162    prepareScaleDataIfNecessary();
163    if (m_scaled)
164        m_reader->setScaledSize(scaledSize());
165}
166
167void ImageDecoderQt::internalReadImage(size_t frameIndex)
168{
169    ASSERT(m_reader);
170
171    if (m_reader->supportsAnimation())
172        m_reader->jumpToImage(frameIndex);
173    else if (frameIndex) {
174        setFailed();
175        return clearPointers();
176    }
177
178    if (!internalHandleCurrentImage(frameIndex))
179      setFailed();
180
181    // Attempt to return some memory
182    for (int i = 0; i < m_frameBufferCache.size(); ++i) {
183        if (m_frameBufferCache[i].status() != ImageFrame::FrameComplete)
184            return;
185    }
186
187    clearPointers();
188}
189
190bool ImageDecoderQt::internalHandleCurrentImage(size_t frameIndex)
191{
192    ImageFrame* const buffer = &m_frameBufferCache[frameIndex];
193    QSize imageSize = m_reader->scaledSize();
194    if (imageSize.isEmpty())
195        imageSize = m_reader->size();
196
197    if (!buffer->setSize(imageSize.width(), imageSize.height()))
198        return false;
199
200    QImage image(reinterpret_cast<uchar*>(buffer->getAddr(0, 0)), imageSize.width(), imageSize.height(), sizeof(ImageFrame::PixelData) * imageSize.width(), m_reader->imageFormat());
201
202    buffer->setDuration(m_reader->nextImageDelay());
203    m_reader->read(&image);
204
205    // ImageFrame expects ARGB32.
206    if (buffer->premultiplyAlpha()) {
207        if (image.format() != QImage::Format_ARGB32_Premultiplied)
208            image = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
209    } else {
210        if (image.format() != QImage::Format_ARGB32)
211            image = image.convertToFormat(QImage::Format_ARGB32);
212    }
213
214    if (reinterpret_cast<const uchar*>(image.constBits()) != reinterpret_cast<const uchar*>(buffer->getAddr(0, 0))) {
215        // The in-buffer was replaced during decoding with another, so copy into it manually.
216        memcpy(buffer->getAddr(0, 0), image.constBits(),  image.byteCount());
217    }
218
219    if (image.isNull()) {
220        frameCount();
221        repetitionCount();
222        clearPointers();
223        return false;
224    }
225
226    buffer->setOriginalFrameRect(image.rect());
227    buffer->setHasAlpha(image.hasAlphaChannel());
228    buffer->setStatus(ImageFrame::FrameComplete);
229
230    return true;
231}
232
233// The QImageIOHandler is not able to tell us how many frames
234// we have and we need to parse every image. We do this by
235// increasing the m_frameBufferCache by one and try to parse
236// the image. We stop when QImage::read fails and then need
237// to resize the m_frameBufferCache to the final size and update
238// the failed bit. If we failed to decode the first image
239// then we truly failed to decode, otherwise we're OK.
240
241// TODO: Do not increment the m_frameBufferCache.size() by one but more than one
242void ImageDecoderQt::forceLoadEverything()
243{
244    int imageCount = 0;
245
246    do {
247        m_frameBufferCache.resize(++imageCount);
248    } while (internalHandleCurrentImage(imageCount - 1));
249
250    // If we failed decoding the first image we actually
251    // have no images and need to set the failed bit.
252    // Otherwise, we want to forget about
253    // the last attempt to decode a image.
254    m_frameBufferCache.resize(imageCount - 1);
255    for (size_t i = 0; i < m_frameBufferCache.size(); ++i)
256        m_frameBufferCache[i].setPremultiplyAlpha(m_premultiplyAlpha);
257    if (imageCount == 1)
258      setFailed();
259}
260
261void ImageDecoderQt::clearPointers()
262{
263    m_reader.clear();
264    m_buffer.clear();
265}
266
267PassNativeImagePtr ImageFrame::asNewNativeImage() const
268{
269    QImage::Format format;
270    if (m_hasAlpha)
271        format = m_premultiplyAlpha ?  QImage::Format_ARGB32_Premultiplied : QImage::Format_ARGB32;
272    else
273        format = QImage::Format_RGB32;
274
275    QImage img(reinterpret_cast<uchar*>(m_bytes), m_size.width(), m_size.height(), sizeof(PixelData) * m_size.width(), format);
276
277    return new QPixmap(QPixmap::fromImage(img));
278}
279
280}
281
282// vim: ts=4 sw=4 et
283