bool ICOImageDecoder::decodeAtIndex(size_t index)
{
ASSERT(index < m_dirEntries.size());
const IconDirectoryEntry& dirEntry = m_dirEntries[index];
const ImageType imageType = imageTypeAtIndex(index);
if (imageType == Unknown)
return false; // Not enough data to determine image type yet.
if (imageType == BMP) {
if (!m_bmpReaders[index]) {
// We need to have already sized m_frameBufferCache before this, and
// we must not resize it again later (see caution in frameCount()).
ASSERT(m_frameBufferCache.size() == m_dirEntries.size());
m_bmpReaders[index].set(new BMPImageReader(this, dirEntry.m_imageOffset, 0, true));
m_bmpReaders[index]->setData(m_data.get());
m_bmpReaders[index]->setBuffer(&m_frameBufferCache[index]);
}
m_frameSize = dirEntry.m_size;
bool result = m_bmpReaders[index]->decodeBMP(false);
m_frameSize = IntSize();
return result;
}
if (!m_pngDecoders[index]) {
m_pngDecoders[index].set(new PNGImageDecoder(m_premultiplyAlpha, m_ignoreGammaAndColorProfile));
setDataForPNGDecoderAtIndex(index);
}
// Fail if the size the PNGImageDecoder calculated does not match the size
// in the directory.
if (m_pngDecoders[index]->isSizeAvailable() && (m_pngDecoders[index]->size() != dirEntry.m_size))
return setFailed();
m_frameBufferCache[index] = *m_pngDecoders[index]->frameBufferAtIndex(0);
return !m_pngDecoders[index]->failed() || setFailed();
}
bool ICOImageDecoder::decodeAtIndex(size_t index) {
SECURITY_DCHECK(index < m_dirEntries.size());
const IconDirectoryEntry& dirEntry = m_dirEntries[index];
const ImageType imageType = imageTypeAtIndex(index);
if (imageType == Unknown)
return false; // Not enough data to determine image type yet.
if (imageType == BMP) {
if (!m_bmpReaders[index]) {
m_bmpReaders[index] =
wrapUnique(new BMPImageReader(this, dirEntry.m_imageOffset, 0, true));
m_bmpReaders[index]->setData(m_data.get());
}
// Update the pointer to the buffer as it could change after
// m_frameBufferCache.resize().
m_bmpReaders[index]->setBuffer(&m_frameBufferCache[index]);
m_frameSize = dirEntry.m_size;
bool result = m_bmpReaders[index]->decodeBMP(false);
m_frameSize = IntSize();
return result;
}
if (!m_pngDecoders[index]) {
AlphaOption alphaOption =
m_premultiplyAlpha ? AlphaPremultiplied : AlphaNotPremultiplied;
m_pngDecoders[index] = wrapUnique(
new PNGImageDecoder(alphaOption, m_colorSpaceOption, m_maxDecodedBytes,
dirEntry.m_imageOffset));
setDataForPNGDecoderAtIndex(index);
}
// Fail if the size the PNGImageDecoder calculated does not match the size
// in the directory.
if (m_pngDecoders[index]->isSizeAvailable() &&
(m_pngDecoders[index]->size() != dirEntry.m_size))
return setFailed();
m_frameBufferCache[index] = *m_pngDecoders[index]->frameBufferAtIndex(0);
m_frameBufferCache[index].setPremultiplyAlpha(m_premultiplyAlpha);
return !m_pngDecoders[index]->failed() || setFailed();
}
