I've implemented a simple configurable mode to control how many colors the
Render extension allocates on dynamic indexed visuals (pseudo/gray).
Here's the comment I wrote in the code:
/*
* For dynamic indexed visuals (GrayScale and PseudoColor), these control the
* selection of colors allocated for drawing to Pictures. The default
* policy depends on the size of the colormap:
*
* Size Default Policy
* ----------------------------
* < 64 PolicyMono
* < 256 PolicyGray
* 256 PolicyColor (only on PseudoColor)
*
* The actual allocation code lives in miindex.c, and so is
* austensibly server dependent, but that code does:
*
* PolicyMono Allocate no additional colors, use black and white
* PolicyGray Allocate 13 gray levels (11 cells used)
* PolicyColor Allocate a 4x4x4 cube and 13 gray levels (71 cells used)
*
* Here's a picture to help understand how many colors are
* actually allocated (this is just the gray ramp):
*
* gray level
* all 0000 1555 2aaa 4000 5555 6aaa 8000 9555 aaaa bfff d555 eaaa ffff
* b/w 0000 ffff
* 4x4x4 5555 aaaa
* extra 1555 2aaa 4000 6aaa 8000 9555 bfff d555 eaaa
*
* The default colormap supplies two gray levels (black/white), the
* 4x4x4 cube allocates another two and nine more are allocated to fill
* in the 13 levels. When the 4x4x4 cube is not allocated, a total of
* 11 cells are allocated.
*/
This policy is controlled by either a command line option (-render) or an
XF86Config parameter that lives in the ServerFlags section:
Section "ServerFlags"
Option "RenderColormapMode" "gray"
EndSection
The set of modes is the same in both cases 'default', 'mono', 'gray' and
'color'.
Keith Packard XFree86 Core Team HP Cambridge Research Lab
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