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SDL_Overlay(3)				SDL API Reference			   SDL_Overlay(3)

NAME
       SDL_Overlay - YUV video overlay

STRUCTURE DEFINITION
       typedef struct{
	 Uint32 format;
	 int w, h;
	 int planes;
	 Uint16 *pitches;
	 Uint8 **pixels;
	 Uint32 hw_overlay:1;
       } SDL_Overlay;

STRUCTURE DATA
       format		   Overlay format (see below)

       w, h		   Width and height of overlay

       planes		   Number of planes in the overlay. Usually either 1 or 3

       pitches		   An  array of pitches, one for each plane. Pitch is the length of a row
			   in bytes.

       pixels		   An array of pointers to teh data of each plane. The overlay should  be
			   locked before these pointers are used.

       hw_overlay	   This will be set to 1 if the overlay is hardware accelerated.

DESCRIPTION
       A  SDL_Overlay  is similar to a SDL_Surface except it stores a YUV overlay. All the fields
       are read only, except for pixels which should be  locked  before  use.  The  format  field
       stores the format of the overlay which is one of the following:

       #define SDL_YV12_OVERLAY  0x32315659  /* Planar mode: Y + V + U */
       #define SDL_IYUV_OVERLAY  0x56555949  /* Planar mode: Y + U + V */
       #define SDL_YUY2_OVERLAY  0x32595559  /* Packed mode: Y0+U0+Y1+V0 */
       #define SDL_UYVY_OVERLAY  0x59565955  /* Packed mode: U0+Y0+V0+Y1 */
       #define SDL_YVYU_OVERLAY  0x55595659  /* Packed mode: Y0+V0+Y1+U0 */

	More	   information	     on      YUV      formats	   can	    be	    found      at
       http://www.webartz.com/fourcc/indexyuv.htm	     (link	       to	      URL
       http://www.webartz.com/fourcc/indexyuv.htm) .

SEE ALSO
       SDL_CreateYUVOverlay, SDL_LockYUVOverlay, SDL_UnlockYUVOverlay, SDL_FreeYUVOverlay

SDL				      Tue 11 Sep 2001, 23:01			   SDL_Overlay(3)
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