Changes between Version 11 and Version 12 of QtBackLog


Ignore:
Timestamp:
Oct 18, 2009 7:50:04 AM (11 years ago)
Author:
zecke@selfish.org
Comment:

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  • QtBackLog

    v11 v12  
    1616 * QBENCHMARK results are hard to analyze and compare. We need a single and simple way to say if something is faster or slower. Be a bit like sunpsider, do the same math as well, mention slowest and fastest run.
    1717
    18  * Make picking a QImageIOHandler in QImageReader faster
     18 * Make picking a QImageIOHandler in QImageReader faster. Currently even the TIFF plugin is asked to handle images.
    1919
    2020 * Bring zero-copy to QIODevice... big one. That is good for networking and image decoding.
    2121
    22  * Cut down on usage of QImage::scanLine inside Qt.
     22 * Cut down on usage of QImage::scanLine inside Qt. This was already done in the GIF and PNG decoder. Patch is to be merged.
    2323
    24  * Make QGifHandler::imageCount scan through the images.
     24 * Make QGifHandler::imageCount scan through the images. This can give a 5% speedup in the image_cycling reduction.
    2525
    2626=== QtWebKit problems ===
     
    3939 * Go through the Palm changes and consider adopting them. Currently candidates are: Use stack/class memory in CSSParser, use JDCT_Fast for Jpeg decoding (to be achieved with QImageReader to set quality to 49), changes to Cached* to throw away encoded data more early. Palm avoids floating point operation on premultiplied alpha in setRGBA.
    4040
    41  * Using QImageReader::setQuality(49) shows a 20msec (from 440msec to 420msec) improvement in the image_cycling test case reduction.
     41 * Using QImageReader::setQuality(49) will use JDCT_IFAST and promises to give a 5% speedup on image_cycling.