bool virvo::decodeJPEG(CompressedVector& data, JPEGOptions& options)
{
if (data.getCompressionType() != Compress_JPEG)
return false;
if (decodeJPEG(data.vector(), options))
{
data.setCompressionType(Compress_None);
return true;
}
return false;
}
PremultipliedImage decodeImage(const std::string& string) {
const uint8_t* data = reinterpret_cast<const uint8_t*>(string.data());
const size_t size = string.size();
#if !defined(QT_IMAGE_DECODERS)
if (size >= 12) {
uint32_t riff_magic = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
uint32_t webp_magic = (data[8] << 24) | (data[9] << 16) | (data[10] << 8) | data[11];
if (riff_magic == 0x52494646 && webp_magic == 0x57454250) {
return decodeWebP(data, size);
}
}
if (size >= 2) {
uint16_t magic = ((data[0] << 8) | data[1]) & 0xffff;
if (magic == 0xFFD8) {
return decodeJPEG(data, size);
}
}
#endif
QImage image =
QImage::fromData(data, size)
.rgbSwapped()
.convertToFormat(QImage::Format_ARGB32_Premultiplied);
if (image.isNull()) {
throw std::runtime_error("Unsupported image type");
}
auto img = std::make_unique<uint8_t[]>(image.byteCount());
memcpy(img.get(), image.constBits(), image.byteCount());
return { { static_cast<uint32_t>(image.width()), static_cast<uint32_t>(image.height()) },
std::move(img) };
}
