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[directfb-users] Re: Portrait mode display.
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[directfb-users] Re: Portrait mode display.

Quoting Rob Kramer:
> I guess I can do more work on the rotation algorithm, such as keeping CPU 
> cache line sizes in mind etc, but I was wondering if rotation can be done in 
> hardware somehow. Software rotation means using a screen buffer in system 
> memory rather than video memory, killing all acceleration. I'm using a 
> mini-ITX board with the CLE266 chipset. If the CLE266 can't do it, is there 
> any other supported chipset that can?


texture mapping could be used to rotate the image.

Have a look at IDirectFBSurface::TextureTriangles().
I haven't tested it for a while on a CLE266, but it's
working great on Matrox now.

The vertices and texture coordinates for such a rotation
are fairly simple.

Best regards,
  Denis Oliver Kropp

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