There's a bug here somplace
I don't know what to make of this other than there appears to be a bug in the Roku 2 firmware. It's pretty hard to explain, so I'm just going to give the code to reproduce it. Function BuildTex...
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I noticed the same recently. I've found that the Roku 2 really favors the roRegion for drawing objects and text. Wrap the bitmap in a full size region, and see if you get better results.
In addition to this issue, I've also found that on the Roku 2, drawing a bitmap onto another (bitmap or region) with AlphaEnable set to true will cause the alpha to get pushed all the way through, so overlays cause the bitmap you're overlaying to become transparent as well. The only way I've found around that so far is to composite everything on a separate bitmap, then draw that bitmap onto the final canvas with AlphaEnable turned off, which is incredibly frustrating, as the double draw reduces the framerate from 60 down to 30 fps.
In addition to this issue, I've also found that on the Roku 2, drawing a bitmap onto another (bitmap or region) with AlphaEnable set to true will cause the alpha to get pushed all the way through, so overlays cause the bitmap you're overlaying to become transparent as well. The only way I've found around that so far is to composite everything on a separate bitmap, then draw that bitmap onto the final canvas with AlphaEnable turned off, which is incredibly frustrating, as the double draw reduces the framerate from 60 down to 30 fps.
