Mercurial > sdl-ios-xcode
view src/video/SDL_yuv.c @ 1800:cc6bea4bb90d
Removed unused variable
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 10 May 2006 06:07:47 +0000 |
parents | 51038e80ae59 |
children | 782fd950bd46 9a7c62bbc8b3 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* This is the implementation of the YUV video surface support */ #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; if ( (display->flags & SDL_OPENGL) == SDL_OPENGL ) { SDL_SetError("YUV overlays are not supported in OpenGL mode"); return NULL; } /* Display directly on video surface, if possible */ if ( SDL_getenv("SDL_VIDEO_YUV_DIRECT") ) { if ( (display == SDL_PublicSurface) && ((SDL_VideoSurface->format->BytesPerPixel == 2) || (SDL_VideoSurface->format->BytesPerPixel == 4)) ) { display = SDL_VideoSurface; } } overlay = NULL; yuv_hwaccel = SDL_getenv("SDL_VIDEO_YUV_HWACCEL"); if ( ((display == SDL_VideoSurface) && video->CreateYUVOverlay) && (!yuv_hwaccel || (SDL_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) { SDL_Rect src, dst; int srcx, srcy, srcw, srch; int dstx, dsty, dstw, dsth; /* Clip the rectangle to the screen area */ srcx = 0; srcy = 0; srcw = overlay->w; srch = overlay->h; dstx = dstrect->x; dsty = dstrect->y; dstw = dstrect->w; dsth = dstrect->h; if ( dstx < 0 ) { srcw += (dstx * overlay->w) / dstrect->w; dstw += dstx; srcx -= (dstx * overlay->w) / dstrect->w; dstx = 0; } if ( (dstx+dstw) > current_video->screen->w ) { int extra = (dstx+dstw - current_video->screen->w); srcw -= (extra * overlay->w) / dstrect->w; dstw -= extra; } if ( dsty < 0 ) { srch += (dsty * overlay->h) / dstrect->h; dsth += dsty; srcy -= (dsty * overlay->h) / dstrect->h; dsty = 0; } if ( (dsty+dsth) > current_video->screen->h ) { int extra = (dsty+dsth - current_video->screen->h); srch -= (extra * overlay->h) / dstrect->h; dsth -= extra; } if ( srcw <= 0 || srch <= 0 || srch <= 0 || dsth <= 0 ) { return 0; } /* Ugh, I can't wait for SDL_Rect to be int values */ src.x = srcx; src.y = srcy; src.w = srcw; src.h = srch; dst.x = dstx; dst.y = dsty; dst.w = dstw; dst.h = dsth; return overlay->hwfuncs->Display(current_video, overlay, &src, &dst); } void SDL_FreeYUVOverlay(SDL_Overlay *overlay) { if ( overlay ) { if ( overlay->hwfuncs ) { overlay->hwfuncs->FreeHW(current_video, overlay); } SDL_free(overlay); } }