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- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-
- Sam Lantinga
- slouken@devolution.com
- */
-
- #ifdef SAVE_RCSID
- static char rcsid =
- "@(#) $Id: SDL_yuv.c,v 1.1.2.5 2001/02/22 00:21:51 hercules Exp $";
- #endif
-
- /* This is the implementation of the YUV video surface support */
-
- #include <stdlib.h>
- #include <string.h>
-
- #include "SDL_getenv.h"
- #include "SDL_video.h"
- #include "SDL_sysvideo.h"
- #include "SDL_yuvfuncs.h"
- #include "SDL_yuv_sw_c.h"
-
-
- SDL_Overlay *SDL_CreateYUVOverlay(int w, int h, Uint32 format,
- SDL_Surface *display)
- {
- SDL_VideoDevice *video = current_video;
- SDL_VideoDevice *this = current_video;
- const char *yuv_hwaccel;
- SDL_Overlay *overlay;
-
- overlay = NULL;
-
- /* Display directly on video surface, if possible */
- #if 0
- if ( (display == SDL_PublicSurface) &&
- ((SDL_VideoSurface->format->BytesPerPixel == 2) ||
- (SDL_VideoSurface->format->BytesPerPixel == 4)) ) {
- display = SDL_VideoSurface;
- }
- #endif
- yuv_hwaccel = getenv("SDL_VIDEO_YUV_HWACCEL");
- if ( ((display == SDL_VideoSurface) && video->CreateYUVOverlay) &&
- (!yuv_hwaccel || (atoi(yuv_hwaccel) > 0)) ) {
- overlay = video->CreateYUVOverlay(this, w, h, format, display);
- }
- /* If hardware YUV overlay failed ... */
- if ( overlay == NULL ) {
- overlay = SDL_CreateYUV_SW(this, w, h, format, display);
- }
- return overlay;
- }
-
- int SDL_LockYUVOverlay(SDL_Overlay *overlay)
- {
- return overlay->hwfuncs->Lock(current_video, overlay);
- }
-
- void SDL_UnlockYUVOverlay(SDL_Overlay *overlay)
- {
- overlay->hwfuncs->Unlock(current_video, overlay);
- }
-
- int SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect)
- {
- return overlay->hwfuncs->Display(current_video, overlay, dstrect);
- }
-
- void SDL_FreeYUVOverlay(SDL_Overlay *overlay)
- {
- if ( overlay ) {
- if ( overlay->hwfuncs ) {
- overlay->hwfuncs->FreeHW(current_video, overlay);
- }
- free(overlay);
- }
- }
-