src/video/SDL_yuv.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 15 Jul 2007 21:50:07 +0000
branchSDL-1.2
changeset 4076 9a7c62bbc8b3
parent 1643 51038e80ae59
child 4159 a1b03ba2fcd0
permissions -rw-r--r--
Fixed bug #457 Don't crash if passed a NULL overlay. The app crashes anyway, since it's not checking the return value of the create call, but at least it's not crashing in SDL anymore. :)
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 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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}