Hello all
I am running Xvfb for testing. But I found it set a wrong
default depth.
This is my steps. I run testing with 16bit depth. But I always
get the default depth 15.
Xvfb -screen 0 1024x768x16 :1.0 -ac +bs -kb &
xdpyinfo -display :1.0 | grep "depth of root window"
The result is "15 planes". There are totally 16 visuals. 8 visuals
for the format with depth 15. And the other 8 visuals for the format
with dep 16. When run Xvfb with "1024x768x32", it will report "24 planes".
By te way, the whitepixel is 32767 when I test in 16bit mode.
I debugged the Xvfb. The visuals is allocated in miDoInitVisuals(...).
(xc/programs/Xserver/mi/micmap.c) In that function, it didn't know the
default depth of the screen. It will also create visuals for depth 15
because both formats have the same bitsPerPixel.
miDoInitVisuals(VisualPtr *visualp, DepthPtr *depthp, int *nvisualp,
int *ndepthp, int *rootDepthp, VisualID *defaultVisp,
unsigned long sizes, int bitsPerRGB, int preferredVis)
{
....
/* none specified, we'll guess from pixmap formats */
if (!miVisuals)
{
for (f = 0; f < screenInfo.numPixmapFormats; f++)
{
d = screenInfo.formats[f].depth;
b = screenInfo.formats[f].bitsPerPixel;
if (sizes & (1 << (b - 1)))
vtype = miGetDefaultVisualMask(d);
else
vtype = 0;
if (!miSetVisualTypes (d, vtype, bitsPerRGB, -1))
return FALSE;
}
}
....
}
When the other driver , such as I810, calls into miDoInitVisuals, the
miVisual will not be NULL. It seems vfb didn't create the visuals based
on its default depth.
Best Regards!
Peng Hongbo
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