https://bugs.kde.org/show_bug.cgi?id=355684
--- Comment #5 from Benedikt Gollatz <bened...@gollatz.net> ---
Using Rakyn's patch, I get visible icons with a black background on both of my
systems, i.e. including the one where icon display worked well previously. This
is because for the icons grabbed those two systems, xcbImage->depth is 24,
whereas xcbImage->bpp is 32. This is in line with the comments in the
xcb-util-image source code:
uint8_t depth; /**< Depth in bits. Valid depths
* are 1, 4, 8, 16, 24 for z format,
* 1 for xy-bitmap-format, anything
* for xy-pixmap-format.
*/
uint8_t bpp; /**< Storage per pixel in bits.
* Must be >= depth. Valid bpp
* are 1, 4, 8, 16, 24, 32 for z
* format, 1 for xy-bitmap format,
* anything for xy-pixmap-format.
*/
Effectively, what Rakyn's code does in this case, is simply use
QImage::Format_RGB32 always and ignore the alpha channel completely (basically,
what I did with my hacky workaround above). Once one changes xcbImage->depth to
xcbImage->bpp in the switch statement, the old behaviour of the unpatched
version returns.
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