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  1. Qt
  2. QTBUG-50930

[Performance REG] Painting gradients much slower due to converting RGBA64->RGBA32

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P3: Somewhat important P3: Somewhat important
    • 5.6.1
    • 5.6.0 Beta
    • GUI: Painting
    • None
    • Linux/X11, CPU: i7 3770k OC 4.1GHz

      Painting gradients (software rasterizer) are much slower due to converting RGBA64->RGBA32. The performance issue is caused by converting color table using "toArgb32()" instead of using 32bit cached table. On FullHD painting can be more than 2x slower than Qt4.

        1. GradientPerformance_qtbug50930.tar.gz
          0.8 kB
        2. gradient-performance.patch
          8 kB
        3. Patch
          1 kB
        For Gerrit Dashboard: QTBUG-50930
        # Subject Branch Project Status CR V
        148892,6 QtGui: Avoid rgba64->rgba32 conversion on every pixel in gradient 5.6 qt/qtbase Status: MERGED +2 0

            allan.jensen Allan Sandfeld Jensen
            zaps166 Błażej Szczygieł
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              Created:
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