linux-kernel - Re: [PATCH v2] fbdev: fix fillrect for 24bpp modes

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Date:	Tue, 21 Apr 2009 07:10:03 +0200
From:	Krzysztof Helt <krzysztof.h1@...zta.fm>
To:	spock@...too.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fbdev: fix fillrect for 24bpp modes

On Sat, 18 Apr 2009 20:52:34 +0200
Michal Januszewski <spock@...too.org> wrote:

> The software fillrect routines do not work properly when the number of
> pixels per machine word is not an integer.  To see that, run the following
> command on a fbdev console with a 24bpp video mode, using a non-accelerated
> driver such as (u)vesafb:
> 
>   reset ; echo -e '\e[41mtest\e[K'
> 
> The expected result is 'test' displayed on a line with red background.
> Instead of that, 'test' has a red background, but the rest of the line
> (rendered using fillrect()) contains a distored colorful pattern.
> 
> This patch fixes the problem by correctly computing rotation shifts.
> It has been tested in a 24bpp mode on 32- and 64-bit little-endian
> machines.
> 
> Signed-off-by: Michał Januszewski <spock@...too.org>
> ---

I have tested the patch and it has worked with padded lines.

Acked-by: Krzysztof Helt <krzysztof.h1@...pl>

However, there is  a comment from Andrew Morton.

Regards,
Krzysztof

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