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2009-05-26gstspu: Implement PGS rendering and alpha blendingJan Schmidt1-0/+56
Refactor the DVD subpicture compositing, switching it to 8-bit alpha calculations. Reuse some of the resulting code to implement PGS subpicture blending. Implement parsing and collecting of composition objects properly, but assuming a single active window and colour palette for now. I need more PGS samples.