view src/video/SDL_yuv.c @ 1775:5572e4204f36

Date: Sun, 7 May 2006 19:22:33 -0400 From: Mike Frysinger Subject: [SDL] [patch] fix building with DirectFB-0.9.25.1 another DirectFB release, another small bit of API breakage :) this time around, DIKI_ALTGR has been removed and DIKI_ALT_R is supposed to be used ... DIKI_ALT_R is not a new define, so there shouldnt be any need for checking the DirectFB version ... it should work with older DirectFB's as well thanks to Sascha Schwarz for pointing this out on the Gentoo bugzilla: http://bugs.gentoo.org/132571 -mike
author Sam Lantinga <slouken@libsdl.org>
date Mon, 08 May 2006 02:09:34 +0000 (2006-05-08)
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);
	}
}