Re: [Question] Colour management
flat view
From: Ville Syrjälä <syrjala@sci.fi>
Date: 2004-07-31 22:19:00
On Sat, Jul 31, 2004 at 06:26:27PM +0800, Antonino A. Daplas wrote:
On Saturday 31 July 2004 02:12, Alexander Kern wrote:quoted
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/ ------------------------------------------------------- This SF.Net email is sponsored by OSTG. Have you noticed the changes on Linux.com, ITManagersJournal and NewsForge in the past few weeks? Now, one more big change to announce. We are now OSTG- Open Source Technology Group. Come see the changes on the new OSTG site. www.ostg.com