1 .TH "SDL_Overlay" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 

     2 .SH "NAME"

     3 SDL_Overlay \- YUV video overlay

     4 .SH "STRUCTURE DEFINITION"

     5 .PP

     6 .nf

     7 \f(CWtypedef struct{

     8   Uint32 format;

     9   int w, h;

    10   int planes;

    11   Uint16 *pitches;

    12   Uint8 **pixels;

    13   Uint32 hw_overlay:1;

    14 } SDL_Overlay;\fR

    15 .fi

    16 .PP

    17 .SH "STRUCTURE DATA"

    18 .TP 20

    19 \fBformat\fR

    20 Overlay format (see below)

    21 .TP 20

    22 \fBw, h\fR

    23 Width and height of overlay

    24 .TP 20

    25 \fBplanes\fR

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

    27 .TP 20

    28 \fBpitches\fR

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

    30 .TP 20

    31 \fBpixels\fR

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

    33 .TP 20

    34 \fBhw_overlay\fR

    35 This will be set to 1 if the overlay is hardware accelerated\&.

    36 .SH "DESCRIPTION"

    37 .PP

    38 A \fBSDL_Overlay\fR is similar to a \fI\fBSDL_Surface\fR\fR except it stores a YUV overlay\&. All the fields are read only, except for \fBpixels\fR which should be \fIlocked\fR before use\&. The \fBformat\fR field stores the format of the overlay which is one of the following: 

    39 .PP

    40 .nf

    41 \f(CW#define SDL_YV12_OVERLAY  0x32315659  /* Planar mode: Y + V + U */

    42 #define SDL_IYUV_OVERLAY  0x56555949  /* Planar mode: Y + U + V */

    43 #define SDL_YUY2_OVERLAY  0x32595559  /* Packed mode: Y0+U0+Y1+V0 */

    44 #define SDL_UYVY_OVERLAY  0x59565955  /* Packed mode: U0+Y0+V0+Y1 */

    45 #define SDL_YVYU_OVERLAY  0x55595659  /* Packed mode: Y0+V0+Y1+U0 */\fR

    46 .fi

    47 .PP

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

    49 .SH "SEE ALSO"

    50 .PP

    51 \fI\fBSDL_CreateYUVOverlay\fP\fR, \fI\fBSDL_LockYUVOverlay\fP\fR, \fI\fBSDL_UnlockYUVOverlay\fP\fR, \fI\fBSDL_FreeYUVOverlay\fP\fR

    52 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01