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: 129851
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029da30c
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