From: Antonino Daplas <adaplas@pol.net>
To: irene7@mail2000.com.tw
Cc: Linux Fbdev development list <linux-fbdev-devel@lists.sourceforge.net>
Subject: Re: each character are reverse (fbcon_cfb4)
Date: 12 Mar 2003 06:14:03 +0800 [thread overview]
Message-ID: <1047420837.1128.70.camel@localhost.localdomain> (raw)
In-Reply-To: <1047308678.13618.irene7@mail2000.com.tw>
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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prev parent reply other threads:[~2003-03-11 22:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-10 15:04 each character are reverse (fbcon_cfb4) irene7
2003-03-11 22:14 ` Antonino Daplas [this message]
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