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comparison src/video/SDL_yuv.c @ 0:74212992fb08

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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children 1a2723474f12
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-1:000000000000 0:74212992fb08
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@devolution.com
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 0
52 if ( (display == SDL_PublicSurface) &&
53 ((SDL_VideoSurface->format->BytesPerPixel == 2) ||
54 (SDL_VideoSurface->format->BytesPerPixel == 4)) ) {
55 display = SDL_VideoSurface;
56 }
57 #endif
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 }