Re: [Question] Colour management

["Ville Syrjälä" <syrjala@sci.fi>]

On Sat, Jul 31, 2004 at 06:26:27PM +0800, Antonino A. Daplas wrote:
> On Saturday 31 July 2004 02:12, Alexander Kern wrote:
> > Hallo Tony,
> >
> > can you explain the deep mining of fb_setcolreg. Background, I observe
> > wrong palette using in 15 and 16 bpp modes, but can not understand, what is
> > the right approach. In both cases from penguin logo I can see only contour
> > in honey yellow and blue vertical string jsimmons, pretty scury ;-) The
> > rest is black! The simple text or ncurses applications have always right
> > colours. Additionally and only by 16bpp fbi shows blurry images. In 15bpp
> > fbi works fine. fbtest works fine and his penguins look good in all
> > resolutions ?!
> 
> This will need a long answer. (For mistakes or ommisions, please let me know)
> 
> fb_setcolreg has 2 functions, initialize info->pseudopalette (if needed) and
> initialize the hardware CLUT (if needed).

BTW fb_setcolreg ends up writing half of the registers twice (more if you 
have to fill all slots). It might be better to have two functions. The 
first one would be the current fb_setcolreg except it wouldn't actually 
write anything. It would only fill in the correct register values. And the 
second one would write the clut to hardware. That would avoid the multiple 
writes.

-- 
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/


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