From: "Ville Syrjälä" <syrjala@sci.fi>
To: linux-fbdev-devel@lists.sourceforge.net
Subject: Re: [Question] Colour management
Date: Sat, 31 Jul 2004 16:31:29 +0300 [thread overview]
Message-ID: <20040731133129.GA12797@sci.fi> (raw)
In-Reply-To: <200407311826.27332.adaplas@hotpop.com>
On Sat, Jul 31, 2004 at 06:26:27PM +0800, Antonino A. Daplas wrote:
> In directcolor mode where the channel size != CLUT register size, setting
> the CLUT is a bit tricky.
>
> Take for example, RGB555. Assuming an 8-bit CLUT size, each channel can only
> accept a total of 32 entries (2 power of 5). Since an 8-bit CLUT has 256 entries,
> then the driver needs to step by 8 (256/32). The code is like this then:
>
> red_reg[index * 8] = red
> green_reg[index * 8] = green
> blue_reg[index * 8] = blue
>
> Some hardware require that all 8 entries needs to be filled up.
I noticed you do this in i810fb. What happens if you don't do this?
AFAIK mach64 doesn't need this.
--
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/
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next prev parent reply other threads:[~2004-07-31 13:31 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-22 18:49 [PATCH] atyfb: vblank irq support Ville Syrjälä
2004-07-24 23:12 ` Alexander Kern
2004-07-25 0:03 ` Antonino A. Daplas
2004-07-25 18:36 ` Alexander Kern
2004-07-25 22:47 ` Antonino A. Daplas
2004-07-30 18:12 ` [Question] Colour management Alexander Kern
2004-07-31 10:26 ` Antonino A. Daplas
2004-07-31 13:31 ` Ville Syrjälä [this message]
2004-07-31 21:19 ` Antonino A. Daplas
2004-07-31 22:19 ` Alexander Kern
2004-07-31 23:37 ` Antonino A. Daplas
2004-07-31 22:18 ` Ville Syrjälä
2004-07-31 23:47 ` Antonino A. Daplas
2004-07-31 22:10 ` Ville Syrjälä
2004-08-01 1:03 ` Antonino A. Daplas
2004-07-25 10:16 ` [PATCH] atyfb: vblank irq support Ville Syrjälä
2004-07-25 18:29 ` Alexander Kern
2004-07-25 23:36 ` Ville Syrjälä
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