src/video/SDL_yuv.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 14 Dec 2001 12:38:15 +0000
changeset 252 e8157fcb3114
parent 81 1a2723474f12
child 297 f6ffac90895c
permissions -rw-r--r--
Updated the source with the correct e-mail address
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Library General Public
     7     License as published by the Free Software Foundation; either
     8     version 2 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Library General Public License for more details.
    14 
    15     You should have received a copy of the GNU Library General Public
    16     License along with this library; if not, write to the Free
    17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 #ifdef SAVE_RCSID
    24 static char rcsid =
    25  "@(#) $Id$";
    26 #endif
    27 
    28 /* This is the implementation of the YUV video surface support */
    29 
    30 #include <stdlib.h>
    31 #include <string.h>
    32 
    33 #include "SDL_getenv.h"
    34 #include "SDL_video.h"
    35 #include "SDL_sysvideo.h"
    36 #include "SDL_yuvfuncs.h"
    37 #include "SDL_yuv_sw_c.h"
    38 
    39 
    40 SDL_Overlay *SDL_CreateYUVOverlay(int w, int h, Uint32 format,
    41                                   SDL_Surface *display)
    42 {
    43 	SDL_VideoDevice *video = current_video;
    44 	SDL_VideoDevice *this  = current_video;
    45 	const char *yuv_hwaccel;
    46 	SDL_Overlay *overlay;
    47 
    48 	overlay = NULL;
    49 
    50 	/* Display directly on video surface, if possible */
    51 	if ( getenv("SDL_VIDEO_YUV_DIRECT") ) {
    52 		if ( (display == SDL_PublicSurface) &&
    53 		     ((SDL_VideoSurface->format->BytesPerPixel == 2) ||
    54 		      (SDL_VideoSurface->format->BytesPerPixel == 4)) ) {
    55 			display = SDL_VideoSurface;
    56 		}
    57 	}
    58         yuv_hwaccel = getenv("SDL_VIDEO_YUV_HWACCEL");
    59 	if ( ((display == SDL_VideoSurface) && video->CreateYUVOverlay) &&
    60 	     (!yuv_hwaccel || (atoi(yuv_hwaccel) > 0)) ) {
    61 		overlay = video->CreateYUVOverlay(this, w, h, format, display);
    62 	}
    63 	/* If hardware YUV overlay failed ... */
    64 	if ( overlay == NULL ) {
    65 		overlay = SDL_CreateYUV_SW(this, w, h, format, display);
    66 	}
    67 	return overlay;
    68 }
    69 
    70 int SDL_LockYUVOverlay(SDL_Overlay *overlay)
    71 {
    72 	return overlay->hwfuncs->Lock(current_video, overlay);
    73 }
    74 
    75 void SDL_UnlockYUVOverlay(SDL_Overlay *overlay)
    76 {
    77 	overlay->hwfuncs->Unlock(current_video, overlay);
    78 }
    79 
    80 int SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect)
    81 {
    82 	return overlay->hwfuncs->Display(current_video, overlay, dstrect);
    83 }
    84 
    85 void SDL_FreeYUVOverlay(SDL_Overlay *overlay)
    86 {
    87 	if ( overlay ) {
    88 		if ( overlay->hwfuncs ) {
    89 			overlay->hwfuncs->FreeHW(current_video, overlay);
    90 		}
    91 		free(overlay);
    92 	}
    93 }