151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* This is the implementation of the YUV video surface support */
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_yuvfuncs.h"
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#include "SDL_yuv_sw_c.h"
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SDL_Overlay *SDL_CreateYUVOverlay(int w, int h, Uint32 format,
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SDL_Surface *display)
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{
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SDL_VideoDevice *video = current_video;
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SDL_VideoDevice *this = current_video;
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const char *yuv_hwaccel;
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SDL_Overlay *overlay;
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if ( (display->flags & SDL_OPENGL) == SDL_OPENGL ) {
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SDL_SetError("YUV overlays are not supported in OpenGL mode");
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return NULL;
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}
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/* Display directly on video surface, if possible */
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if ( SDL_getenv("SDL_VIDEO_YUV_DIRECT") ) {
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if ( (display == SDL_PublicSurface) &&
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((SDL_VideoSurface->format->BytesPerPixel == 2) ||
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(SDL_VideoSurface->format->BytesPerPixel == 4)) ) {
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display = SDL_VideoSurface;
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}
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}
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overlay = NULL;
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yuv_hwaccel = SDL_getenv("SDL_VIDEO_YUV_HWACCEL");
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if ( ((display == SDL_VideoSurface) && video->CreateYUVOverlay) &&
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(!yuv_hwaccel || (SDL_atoi(yuv_hwaccel) > 0)) ) {
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overlay = video->CreateYUVOverlay(this, w, h, format, display);
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}
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/* If hardware YUV overlay failed ... */
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if ( overlay == NULL ) {
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overlay = SDL_CreateYUV_SW(this, w, h, format, display);
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}
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return overlay;
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}
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int SDL_LockYUVOverlay(SDL_Overlay *overlay)
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{
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if ( overlay == NULL ) {
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SDL_SetError("Passed NULL overlay");
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return -1;
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}
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return overlay->hwfuncs->Lock(current_video, overlay);
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}
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void SDL_UnlockYUVOverlay(SDL_Overlay *overlay)
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{
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if ( overlay == NULL ) {
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return;
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}
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overlay->hwfuncs->Unlock(current_video, overlay);
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}
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int SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect)
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{
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SDL_Rect src, dst;
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int srcx, srcy, srcw, srch;
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int dstx, dsty, dstw, dsth;
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if ( overlay == NULL || dstrect == NULL ) {
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SDL_SetError("Passed NULL overlay or dstrect");
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return -1;
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}
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/* Clip the rectangle to the screen area */
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srcx = 0;
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srcy = 0;
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srcw = overlay->w;
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srch = overlay->h;
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dstx = dstrect->x;
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dsty = dstrect->y;
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dstw = dstrect->w;
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dsth = dstrect->h;
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if ( dstx < 0 ) {
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srcw += (dstx * overlay->w) / dstrect->w;
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dstw += dstx;
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srcx -= (dstx * overlay->w) / dstrect->w;
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dstx = 0;
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}
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if ( (dstx+dstw) > current_video->screen->w ) {
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int extra = (dstx+dstw - current_video->screen->w);
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srcw -= (extra * overlay->w) / dstrect->w;
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dstw -= extra;
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}
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if ( dsty < 0 ) {
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srch += (dsty * overlay->h) / dstrect->h;
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dsth += dsty;
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srcy -= (dsty * overlay->h) / dstrect->h;
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dsty = 0;
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}
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if ( (dsty+dsth) > current_video->screen->h ) {
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int extra = (dsty+dsth - current_video->screen->h);
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srch -= (extra * overlay->h) / dstrect->h;
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dsth -= extra;
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}
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if ( srcw <= 0 || srch <= 0 ||
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srch <= 0 || dsth <= 0 ) {
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return 0;
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}
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/* Ugh, I can't wait for SDL_Rect to be int values */
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src.x = srcx;
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src.y = srcy;
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src.w = srcw;
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src.h = srch;
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dst.x = dstx;
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dst.y = dsty;
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dst.w = dstw;
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dst.h = dsth;
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return overlay->hwfuncs->Display(current_video, overlay, &src, &dst);
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}
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void SDL_FreeYUVOverlay(SDL_Overlay *overlay)
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{
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if ( overlay == NULL ) {
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return;
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}
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if ( overlay->hwfuncs ) {
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overlay->hwfuncs->FreeHW(current_video, overlay);
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}
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SDL_free(overlay);
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}
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