[Xfce-bugs] [Bug 922] Weird "banding" problem rendering smooth gradients in desktop backdrop and gqview

bugzilla-daemon at xfce.org bugzilla-daemon at xfce.org
Tue Apr 26 02:30:34 CEST 2005

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------- Additional Comments From bjt23 at cornell.edu  2005-04-26 00:30 UTC -------
Yep, as I expected.  The 16-bit display is the problem.  AFAIK, there are a
couple possibilities here:

gdk_pixbuf_scale() sucks at lower bit depths.

gdk_pixbuf_composite() sucks at lower bit depths.

gdk_pixbuf_render_pixmap_and_mask() sucks at lower bit depths.

Now...  The GdkPixbuf that's initially created for the backdrop uses 8 bits per
pixel, and _scale() and _composite() shouldn't be able to change that, and
shouldn't care about the X visual being used (as they're all client-side).

So that leaves gdk_pixmap_render_pixmap_and_mask().  Perhaps it's not dithering

OR, maybe I'm going about this the wrong way.  Maybe it's dithering like it's
supposed to, but that's just a bad thing to make it do.  Perhaps the initial
GdkPixbuf should be created with the bit depth of the X visual used for the
desktop window.  Of course, this would totally break the current gradient code,
and make writing a replacement a PITA.

Anyone else on xfce-bugs with a clue, feel free to chime in ^_~.

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