Mercurial > sdl-ios-xcode
view src/video/SDL_yuv.c @ 1879:cb232e63552c
Default the X11 dynamically loading on if the OS loader loads libraries
with their private symbols hidden. If that isn't the case, and someone
tries to enable it anyway, spit out a warning and don't let them do it.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 23 Jun 2006 08:39:05 +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); } }