nanogui: Images resolution
Subject:
Re: Images resolution
From:
Rosimildo daSilva ####@####.####
Date:
27 Jan 2000 14:31:21 -0000
Message-Id: <200001271420.GAA32307@www1.xoommail.com>
"Greg Haerr" wrote:
>
> As I think about it, you're probably running RTEMS Microwindows,
> which uses the hardware scr_bios.c driver. This driver _doesn't_
> implement the setpalette() driver function, but instead runs in
> the VGA default 16 color mode. So all your colors are ugly.
> The reason this works at all is that your driver returns ncolors=16,
> and the first 16 colors of the 256 color palette basically match
> the std VGA colors, so the Microwindows color-reduction
> algorithm basically maps image colors to the right values.
>
> The fix is somewhat hard: the std VGA runs in max 640x480x16
> colors, without special programming. The extended programming
> depends on the chipset. We may need grab some libraries
> like GRX or SVGA and write special chipset-specific drivers
> to get the 256 color modes. What we really need is the GRX
> package ported to RTEMS or DOS.
>
Greg,
I have looked at:
+ Linux SVGA
+ GRX
graphics library last night.
They're somewhat large, but possible of being ported to RTEMS.
If anybody with more "graphics" experience than me,
could post some pros and cons of each library, I would appreciated.
I've got the impression that the Linux SVGA would be easier to port.
I am looking for the strenghts and weaknesses of each one.
Rosimildo.
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