On my system (KDE 4.5.4, Qt 4.7.1, Oxygen theme, subpixel rendering enabled, infinality subpixel patchset) I also observed that all ARGB related texts (i.e. those from plasma desktop in taskbar/desktop widgets) only had grayscale AA, but no subpixel AA.
After the assumption regarding an ARGB related bug, played a bit with ARGB test code. It looked as if the raster backend has difficulties with subpixel rendered texts. After changing Qt to the old native backend, all fonts were rendered correctly on my KDE desktop!
- Do you have the new Qt raster backend enabled?
- Can you please revert to the old native backend, for testing?
On my system (KDE 4.5.4, Qt 4.7.1, Oxygen theme, subpixel rendering enabled, infinality subpixel patchset) I also observed that all ARGB related texts (i.e. those from plasma desktop in taskbar/desktop widgets) only had grayscale AA, but no subpixel AA.
After the assumption regarding an ARGB related bug, played a bit with ARGB test code. It looked as if the raster backend has difficulties with subpixel rendered texts. After changing Qt to the old native backend, all fonts were rendered correctly on my KDE desktop!
- Do you have the new Qt raster backend enabled?
- Can you please revert to the old native backend, for testing?
My guess is all of this is related to the raster backend. This ticket might have to do with it: bugreports. qt.nokia. com/browse/ QTBUG-11268
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