[Libva] [PATCH][G45] Fix rendering of subpictures

[Gwenole Beauchesne]

Hi,

This patch fixes rendering of subpictures. There were two problems:  
(i) coords were scaled up too much, (ii) scale factor was not using  
the real visible surface size. You can check before/after conditions  
as follows:

$ ./vaapi_h264 --genimage rgb-rects --putimage blend --putimage-size  
640x480
   The subpicture shall touch the window bounds

$ mplayer -vo vaapi -va vaapi -fs /path/to/some/1080p/video
   Press 'o' (lower-case oh) to show OSD. The text was oversized.

Regards,
Gwenole.

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