| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 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 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | /* This is the implementation of the YUV video surface support */ |
| 25 | |
| 26 | #include "SDL_video.h" |
| 27 | #include "SDL_sysvideo.h" |
| 28 | #include "SDL_yuvfuncs.h" |
| 29 | #include "SDL_yuv_sw_c.h" |
| 30 | |
| 31 | |
| 32 | SDL_Overlay *SDL_CreateYUVOverlay(int w, int h, Uint32 format, |
| 33 | SDL_Surface *display) |
| 34 | { |
| 35 | SDL_VideoDevice *video = current_video; |
| 36 | SDL_VideoDevice *this = current_video; |
| 37 | const char *yuv_hwaccel; |
| 38 | SDL_Overlay *overlay; |
| 39 | |
| 40 | if ( (display->flags & SDL_OPENGL) == SDL_OPENGL ) { |
| 41 | SDL_SetError("YUV overlays are not supported in OpenGL mode"); |
| 42 | return NULL; |
| 43 | } |
| 44 | |
| 45 | /* Display directly on video surface, if possible */ |
| 46 | if ( SDL_getenv("SDL_VIDEO_YUV_DIRECT") ) { |
| 47 | if ( (display == SDL_PublicSurface) && |
| 48 | ((SDL_VideoSurface->format->BytesPerPixel == 2) || |
| 49 | (SDL_VideoSurface->format->BytesPerPixel == 4)) ) { |
| 50 | display = SDL_VideoSurface; |
| 51 | } |
| 52 | } |
| 53 | overlay = NULL; |
| 54 | yuv_hwaccel = SDL_getenv("SDL_VIDEO_YUV_HWACCEL"); |
| 55 | if ( ((display == SDL_VideoSurface) && video->CreateYUVOverlay) && |
| 56 | (!yuv_hwaccel || (SDL_atoi(yuv_hwaccel) > 0)) ) { |
| 57 | overlay = video->CreateYUVOverlay(this, w, h, format, display); |
| 58 | } |
| 59 | /* If hardware YUV overlay failed ... */ |
| 60 | if ( overlay == NULL ) { |
| 61 | overlay = SDL_CreateYUV_SW(this, w, h, format, display); |
| 62 | } |
| 63 | return overlay; |
| 64 | } |
| 65 | |
| 66 | int SDL_LockYUVOverlay(SDL_Overlay *overlay) |
| 67 | { |
| 68 | if ( overlay == NULL ) { |
| 69 | SDL_SetError("Passed NULL overlay"); |
| 70 | return -1; |
| 71 | } |
| 72 | return overlay->hwfuncs->Lock(current_video, overlay); |
| 73 | } |
| 74 | |
| 75 | void SDL_UnlockYUVOverlay(SDL_Overlay *overlay) |
| 76 | { |
| 77 | if ( overlay == NULL ) { |
| 78 | return; |
| 79 | } |
| 80 | overlay->hwfuncs->Unlock(current_video, overlay); |
| 81 | } |
| 82 | |
| 83 | int SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect) |
| 84 | { |
| 85 | SDL_Rect src, dst; |
| 86 | int srcx, srcy, srcw, srch; |
| 87 | int dstx, dsty, dstw, dsth; |
| 88 | |
| 89 | if ( overlay == NULL || dstrect == NULL ) { |
| 90 | SDL_SetError("Passed NULL overlay or dstrect"); |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | /* Clip the rectangle to the screen area */ |
| 95 | srcx = 0; |
| 96 | srcy = 0; |
| 97 | srcw = overlay->w; |
| 98 | srch = overlay->h; |
| 99 | dstx = dstrect->x; |
| 100 | dsty = dstrect->y; |
| 101 | dstw = dstrect->w; |
| 102 | dsth = dstrect->h; |
| 103 | if ( dstx < 0 ) { |
| 104 | srcw += (dstx * overlay->w) / dstrect->w; |
| 105 | dstw += dstx; |
| 106 | srcx -= (dstx * overlay->w) / dstrect->w; |
| 107 | dstx = 0; |
| 108 | } |
| 109 | if ( (dstx+dstw) > current_video->screen->w ) { |
| 110 | int extra = (dstx+dstw - current_video->screen->w); |
| 111 | srcw -= (extra * overlay->w) / dstrect->w; |
| 112 | dstw -= extra; |
| 113 | } |
| 114 | if ( dsty < 0 ) { |
| 115 | srch += (dsty * overlay->h) / dstrect->h; |
| 116 | dsth += dsty; |
| 117 | srcy -= (dsty * overlay->h) / dstrect->h; |
| 118 | dsty = 0; |
| 119 | } |
| 120 | if ( (dsty+dsth) > current_video->screen->h ) { |
| 121 | int extra = (dsty+dsth - current_video->screen->h); |
| 122 | srch -= (extra * overlay->h) / dstrect->h; |
| 123 | dsth -= extra; |
| 124 | } |
| 125 | if ( srcw <= 0 || srch <= 0 || |
| 126 | srch <= 0 || dsth <= 0 ) { |
| 127 | return 0; |
| 128 | } |
| 129 | /* Ugh, I can't wait for SDL_Rect to be int values */ |
| 130 | src.x = srcx; |
| 131 | src.y = srcy; |
| 132 | src.w = srcw; |
| 133 | src.h = srch; |
| 134 | dst.x = dstx; |
| 135 | dst.y = dsty; |
| 136 | dst.w = dstw; |
| 137 | dst.h = dsth; |
| 138 | return overlay->hwfuncs->Display(current_video, overlay, &src, &dst); |
| 139 | } |
| 140 | |
| 141 | void SDL_FreeYUVOverlay(SDL_Overlay *overlay) |
| 142 | { |
| 143 | if ( overlay == NULL ) { |
| 144 | return; |
| 145 | } |
| 146 | if ( overlay->hwfuncs ) { |
| 147 | overlay->hwfuncs->FreeHW(current_video, overlay); |
| 148 | } |
| 149 | SDL_free(overlay); |
| 150 | } |