linux-kernel - Re: [PATCH] fbdev driver for S3 Trio/Virge, updated

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Date:	Thu, 22 Feb 2007 09:08:25 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	James Simmons <jsimmons@...radead.org>
Cc:	Ondrej Zajicek <santiago@...reenet.org>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net,
	Jiri Slaby <jirislaby@...il.com>
Subject: Re: [PATCH] fbdev driver for S3 Trio/Virge, updated

On Thu, 2007-02-22 at 00:53 +0000, James Simmons wrote:
> > > +/* image data is MSB-first, fb structure is MSB-first too */
> > > +static inline u32 expand_color(u32 c)
> > > +{
> > > +	return ((c & 1) | ((c & 2) << 7) | ((c & 4) << 14) | ((c & 8) << 21)) * 0xFF;
> > > +}
> > > +
> > > +/* s3fb_iplan_imageblit silently assumes that almost everything is 8-pixel aligned */
> > 
> > Hmn, same thing with vga16fb... Perhaps we should bring back the
> > fontwidth flag of 2.2 and 2.4 kernels.
> 
> Ug no. It is possible to get 12,6 bit width fonts working with vga 
> interleaved planes. I got it paritally working but never got back to it.
> Its in my queue of this to do. Now that I finished the display class I 
> need to get around to makeing drm/fbdev work together :-)
> 

Of course, not fontwidth exactly, but to allow the driver to specify the
alignment of the blit engine, in this case 8 pixels. I do believe X also
has similar functionality to compensate for the limitation of the
hardware.

Tony

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