Re: [PATCH] add NULL short circuit to fb_dealloc_cmap()

On Sun, 17 Jul 2005, Jon Smirl wrote:

On 7/17/05, Geert Uytterhoeven [off-list ref] wrote:

quoted

quoted

struct fb_super_cmap {
   struct fb_cmap cmap;
   __u16 red[255];
   __u16 blue[255];
   __u16 green[255];
   __u16 transp[255];

                  ^^^
I assume you meant 256?

quoted

}

Then adjust the code as need. Have the embedded cmap struct point to
the fields in the super_cmap and the drivers don't have to be changed.

What if your colormap has more than 256 entries?

I meant 256. Does any hardware exist that takes more that 256 entries? 

1024 was quite common on high-end graphics hardware.

They are __u16 values but I have never seen hardware that take more
that __u8 either.

10 bit was quite common on high-end graphics hardware.

IIRC, DEC TGA can do at least one of them.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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