On Sun, Jul 13, 2003 at 09:31:37PM +1200, Simon Glass wrote:Short version: - 1024x768 screen mode on Matrox G400/G450 - Need a 352x288 YUV surface scaled to full screen (easy enough) - Alpha-blended 1024x768 RGB surface on top (hard) - How?
You can't make layer 0 (CRTC1) appear on top of layer 1 (BES). It's a hardware limitation.
What you could do is ignore the BES altogether and just use CRTC1. The
hardware can StretchBlit from YUV surfaces to RGB surfaces. This is what I
do in the dfbmga driver because CRTC2 doesn't have a hardware scaler.
So set layer 0 to RGB. Create one YUV surface for the video and one RGB
surface for the overlay. Then just blit the surfaces to layer 0's surface.
Thanks very much for the advice - am trying this first with the colour- keying idea as a backup. On my G400 card this punts me to software (gfx/generic/generic.c) which gives an error. I suspect blitting from YUV to RGB is only supported in the G450, so will try that.
Regards, Simon
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