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