Review Request 129851: JpegCreator: Use Qt's support for fast downscaling and auto-rotation

[Alexander Volkov]

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https://git.reviewboard.kde.org/r/129851/
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(Updated Jan. 19, 2017, 1:06 p.m.)


Status
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This change has been marked as submitted.


Review request for Plasma.


Changes
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Submitted with commit c249f8547f2d1913e0570d78a0240c5f8865c336 by Alexander Volkov to branch master.


Repository: kio-extras


Description
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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.


Diffs
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  CMakeLists.txt be305274984321b93e05feeeb6d09490b33a43cc 
  thumbnail/CMakeLists.txt 92eb3c7ae98660eb00e33fbe608de1580ea75912 
  thumbnail/jpegcreator.h 5cab30ff6a0881863ec66d739063f6dbfb4a48f7 
  thumbnail/jpegcreator.cpp 9191fbacd21c65c9fc845fd7c77365005cd8df00 

Diff: https://git.reviewboard.kde.org/r/129851/diff/


Testing
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Thanks,

Alexander Volkov

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