omapzoom VRFB rotation contexts

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Hi,

There are two VRFB contexts handled under STREAMON (omap24xxvout.c)
interface, Could someone explain why?

Is one for preview and the other for capture?

Why the buffer size(iw*ih*2) is again multiplied by  2 for YUV?

vrfb_buf_size = image_width * image_height * 2 * 2; // allocate for
YUV format (worst case)

Thanks
Iqbal
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