how to copy data between two vasurfaces?
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Description
I have to two vasurfaces,and both have image data with the same format (exactly RGBA). I want to copy data of one vasurface to the other , i only find the way that vaDeriveImage the vasurface ,then use vaMapBuffer,but isn't what I want. I want to copy data between GPU memory.And someone can tell me how to do it ,thank you.
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