x11drv: Add stretching support to AlphaBlend

[Kevin Koltzau]

I added a configure check for XRenderSetPictureTransform, as well as
restructured the code to handle if the build system has the function, but
the runtime system does not

On Sunday 17 October 2004 10:34 pm, Kevin Koltzau wrote:
> Changelog:
>  Add stretching support to AlphaBlend
> 
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