JpegCreator: Use Qt's support for fast downscaling and auto-rotation
Review Request #129851 - Created Jan. 18, 2017 and submitted
QImageReader::setScaledSize() allows to use fast downscaling for jpeg images (by setting jpeg_decompress_struct::scale_denom). QImageReader::setQuality(0) sets dct_method to JDCT_IFAST and do_fancy_upsampling to FALSE, although these parameters don't really influence on decoding speed, also as do_block_smoothing which is not used by Qt. QImageReader::setAutoTransform() allows to apply the rotation from EXIF data. It was introduced in Qt 5.5, so bump the required Qt version.
Review request changed
Status: Closed (submitted)
Submitted with commit c249f8547f2d1913e0570d78a0240c5f8865c336 by Alexander Volkov to branch master.