static void decode_callback(int what) {
if (what == 0 && !kParams.done) {
int duration = 0;
if (kParams.dmux != NULL) {
WebPIterator* const curr = &kParams.curr_frame;
if (!WebPDemuxNextFrame(curr)) {
WebPDemuxReleaseIterator(curr);
if (WebPDemuxGetFrame(kParams.dmux, 1, curr)) {
--kParams.loop_count;
kParams.done = (kParams.loop_count == 0);
} else {
kParams.decoding_error = 1;
kParams.done = 1;
return;
}
}
duration = curr->duration;
}
if (!Decode()) {
kParams.decoding_error = 1;
kParams.done = 1;
} else {
glutPostRedisplay();
glutTimerFunc(duration, decode_callback, what);
}
}
}
static void decode_callback(int what) {
if (what == 0 && !kParams.done) {
int duration = 0;
if (kParams.dmux != NULL) {
WebPIterator* const curr = &kParams.curr_frame;
if (!WebPDemuxNextFrame(curr)) {
WebPDemuxReleaseIterator(curr);
if (WebPDemuxGetFrame(kParams.dmux, 1, curr)) {
--kParams.loop_count;
kParams.done = (kParams.loop_count == 0);
if (kParams.done) return;
ClearPreviousFrame();
} else {
kParams.decoding_error = 1;
kParams.done = 1;
return;
}
}
duration = curr->duration;
// Behavior copied from Chrome, cf:
// https://cs.chromium.org/chromium/src/third_party/WebKit/Source/
// platform/graphics/DeferredImageDecoder.cpp?
// rcl=b4c33049f096cd283f32be9a58b9a9e768227c26&l=246
if (duration <= 10) duration = 100;
}
if (!Decode()) {
kParams.decoding_error = 1;
kParams.done = 1;
} else {
glutPostRedisplay();
glutTimerFunc(duration, decode_callback, what);
}
}
}
bool QWebpHandler::read(QImage *image)
{
if (!ensureScanned() || device()->isSequential())
return false;
if (m_hasFirstFrameRead) {
if (!WebPDemuxNextFrame(&m_iter))
return false;
} else {
m_hasFirstFrameRead = true;
}
WebPBitstreamFeatures features;
VP8StatusCode status = WebPGetFeatures(m_iter.fragment.bytes, m_iter.fragment.size, &features);
if (status != VP8_STATUS_OK)
return false;
QImage result(features.width, features.height, QImage::Format_ARGB32);
uint8_t *output = result.bits();
size_t output_size = result.byteCount();
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
if (!WebPDecodeBGRAInto(
reinterpret_cast<const uint8_t*>(m_iter.fragment.bytes), m_iter.fragment.size,
output, output_size, result.bytesPerLine()))
#else
if (!WebPDecodeARGBInto(
reinterpret_cast<const uint8_t*>(m_iter.fragment.bytes), m_iter.fragment.size,
output, output_size, result.bytesPerLine()))
#endif
return false;
*image = result;
return true;
}
bool QWebpHandler::write(const QImage &image)
{
if (image.isNull()) {
qWarning() << "source image is null.";
return false;
}
QImage srcImage = image;
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
if (srcImage.format() != QImage::Format_ARGB32)
srcImage = srcImage.convertToFormat(QImage::Format_ARGB32);
#else /* Q_BIG_ENDIAN */
if (srcImage.format() != QImage::Format_RGBA8888)
srcImage = srcImage.convertToFormat(QImage::Format_RGBA8888);
#endif
WebPPicture picture;
WebPConfig config;
if (!WebPPictureInit(&picture) || !WebPConfigInit(&config)) {
qWarning() << "failed to init webp picture and config";
return false;
}
picture.width = srcImage.width();
picture.height = srcImage.height();
picture.use_argb = 1;
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
if (!WebPPictureImportBGRA(&picture, srcImage.bits(), srcImage.bytesPerLine())) {
#else /* Q_BIG_ENDIAN */
if (!WebPPictureImportRGBA(&picture, srcImage.bits(), srcImage.bytesPerLine())) {
#endif
qWarning() << "failed to import image data to webp picture.";
WebPPictureFree(&picture);
return false;
}
config.lossless = m_lossless;
config.quality = m_quality;
picture.writer = pictureWriter;
picture.custom_ptr = device();
if (!WebPEncode(&config, &picture)) {
qWarning() << "failed to encode webp picture, error code: " << picture.error_code;
WebPPictureFree(&picture);
return false;
}
WebPPictureFree(&picture);
return true;
}
QVariant QWebpHandler::option(ImageOption option) const
{
if (!supportsOption(option) || !ensureScanned())
return QVariant();
switch (option) {
case Quality:
return m_quality;
case Size:
return QSize(m_width, m_height);
case Animation:
return (m_flags & ANIMATION_FLAG) == ANIMATION_FLAG;
default:
return QVariant();
}
}
void QWebpHandler::setOption(ImageOption option, const QVariant &value)
{
switch (option) {
case Quality:
m_quality = qBound(0, value.toInt(), 100);
m_lossless = (m_quality >= 100);
return;
default:
break;
}
return QImageIOHandler::setOption(option, value);
}
bool QWebpHandler::supportsOption(ImageOption option) const
{
return option == Quality
|| option == Size
|| option == Animation;
}
QByteArray QWebpHandler::name() const
{
return QByteArrayLiteral("webp");
}
int QWebpHandler::imageCount() const
{
if (!ensureScanned())
return 0;
if ((m_flags & ANIMATION_FLAG) == 0)
return 1;
return m_frameCount;
}
int QWebpHandler::currentImageNumber() const
{
if (!ensureScanned())
return 0;
return m_iter.frame_num;
}
QRect QWebpHandler::currentImageRect() const
{
if (!ensureScanned())
return QRect();
return QRect(m_iter.x_offset, m_iter.y_offset, m_iter.width, m_iter.height);
}
bool QWebpHandler::jumpToImage(int imageNumber)
{
if (!ensureScanned())
return false;
WebPDemuxReleaseIterator(&m_iter);
return WebPDemuxGetFrame(m_demuxer, imageNumber, &m_iter);
}
bool QWebpHandler::jumpToNextImage()
{
if (!ensureScanned())
return false;
return WebPDemuxNextFrame(&m_iter);
}
int QWebpHandler::loopCount() const
{
if (!ensureScanned() || (m_flags & ANIMATION_FLAG) == 0)
return 0;
return m_loop;
}
int QWebpHandler::nextImageDelay() const
{
if (!ensureScanned())
return 0;
return m_iter.duration;
}
