/***  $Id: yuv.c,v 1.2 2003/09/04 06:02:53 weiym Exp $**  **  Port to MiniGUI by Wei Yongming (2001/10/03).**  Copyright (C) 2001 ~ 2002 Wei Yongming.**  Copyright (C) 2003 Feynman Software.****  SDL - Simple DirectMedia Layer**  Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga*//*** This program is free software; you can redistribute it and/or modify** it under the terms of the GNU General Public License as published by** the Free Software Foundation; either version 2 of the License, or** (at your option) any later version.**** This program 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 General Public License for more details.**** You should have received a copy of the GNU General Public License** along with this program; if not, write to the Free Software** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*//* This is the implementation of the YUV video surface support */#include <stdio.h>#include <stdlib.h>#include <string.h>#include "common.h"#include "newgal.h"#include "sysvideo.h"#include "yuvfuncs.h"#include "yuv_sw_c.h"GAL_Overlay *GAL_CreateYUVOverlay(int w, int h, Uint32 format,                                  GAL_Surface *display){	GAL_VideoDevice *video = current_video;	GAL_VideoDevice *this  = current_video;	const char *yuv_hwaccel;	GAL_Overlay *overlay;	overlay = NULL;	/* Display directly on video surface, if possible */	if ( getenv("GAL_VIDEO_YUV_DIRECT") ) {		if ( (display == GAL_PublicSurface) &&		     ((GAL_VideoSurface->format->BytesPerPixel == 2) ||		      (GAL_VideoSurface->format->BytesPerPixel == 4)) ) {			display = GAL_VideoSurface;		}	}        yuv_hwaccel = getenv("GAL_VIDEO_YUV_HWACCEL");	if ( ((display == GAL_VideoSurface) && video->CreateYUVOverlay) &&	     (!yuv_hwaccel || (atoi(yuv_hwaccel) > 0)) ) {		overlay = video->CreateYUVOverlay(this, w, h, format, display);	}	/* If hardware YUV overlay failed ... */	if ( overlay == NULL ) {		overlay = GAL_CreateYUV_SW(this, w, h, format, display);	}	return overlay;}int GAL_LockYUVOverlay(GAL_Overlay *overlay){	return overlay->hwfuncs->Lock(current_video, overlay);}void GAL_UnlockYUVOverlay(GAL_Overlay *overlay){	overlay->hwfuncs->Unlock(current_video, overlay);}int GAL_DisplayYUVOverlay(GAL_Overlay *overlay, GAL_Rect *dstrect){	return overlay->hwfuncs->Display(current_video, overlay, dstrect);}void GAL_FreeYUVOverlay(GAL_Overlay *overlay){	if ( overlay ) {		if ( overlay->hwfuncs ) {			overlay->hwfuncs->FreeHW(current_video, overlay);		}		free(overlay);	}}