each character are reverse (fbcon_cfb4)

each character are reverse (fbcon_cfb4)

[irene7]

 Hi all ~

   I am porting gray-scale 4 bpp LCD driver .
   i used fbcon_cfb4 in my driver, but i found each character are reversed.
   it is right& lift reverse, not up and down reverse .
   which part of source should i modified to reverse each character.

 Thank you !




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Re: each character are reverse (fbcon_cfb4)

[Antonino Daplas]

On Mon, 2003-03-10 at 23:04, irene7 wrote:
> 
>  Hi all ~
> 
>    I am porting gray-scale 4 bpp LCD driver .
>    i used fbcon_cfb4 in my driver, but i found each character are reversed.
>    it is right& lift reverse, not up and down reverse .
>    which part of source should i modified to reverse each character.
> 

Is the reversal per character, or is the whole display totally
reversed?

Case 1 is easy to fix, it's just an endian problem.  All character
bitmaps are big-endian, so you need to convert them to little-endian
before writing to the framebuffer. Look at the code of rivafb,
especially the byte_rev part.  You can employ something similar.

For the second case, this will be similar to the one I mentioned to you
before.  You have to modify fbcon-cfb4 so it rasters right->left instead
of left->right.

Tony



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