Some fixes for the triangle video rendering

[Christiaan van Dijk]

Not sure where to post this but wanted to share, so here it is :-)

While trying to get tear free video on my RS690 I found some problems in 
the code for rendering the video as a clipped triangle. The size 
limitations are quite strict and scaling the video output window creates 
all kinds of weird effects. This patch maximizes the use of this 
function and resolves the scaling issues. There could be a problem with 
zero target height/width, not sure if this is handled elsewhere.

Christiaan.
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