But What if I want to set the mode to TRUE_COLOR?
In that case we need not worry about colormaps.
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From: Geert Uytterhoeven [mailto:geert@...]
Sent: Saturday, June 07, 2003 10:01 PM
To: Nitin Mahajan
Subject: RE: FW: Sorry the attachment is here
On Sat, 7 Jun 2003, Nitin Mahajan wrote:
> But I read that if uhave a true color setting ,u don't need a
> colormap, Can u please put more light on this?
For truecolor you indeed don't need a colormap.
But for directcolor you do.
Suppose you have a pixel p = (r, g, b). In truecolor mode, the R, G, B
outputs will be:
R = r
G = g
B = b
In directcolor mode, the R, G, B outputs will be:
R = clut.red[r]
G = clut.green[g]
B = clut.blue[b]
> On Sat, 7 Jun 2003, Nitin Mahajan wrote:
> > The colors are definitely in RGB format.
> > Actually Iam getting the fb_fix_screeeninfo.visul as
> > FB_VISUAL_DIRECTCOLOR. This parameter is affected by the setings of
> > var_screeninfo. Can u please tell what setings I will have to do in
> > var_screen_info to get a visual as FB_VISUAL_TRUECOLOR?
> You're right, I forgot about that.
> If the visual is FB_VISUAL_DIRECTCOLOR and you want
> FB_VISUAL_TRUECOLOR, you have to program a linear colormap yourself.
> I.e. a colormap where
> clut.red[i] = i;
> clut.green[i] = i;
> clut.blue[i] = i;
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