view src/video/aalib/SDL_aavideo.h @ 1259:36f24cdfcda7

te: Thu, 17 Apr 2003 11:25:26 -0700 From: "Jim" Subject: [SDL] Frame buffer patches... Would seem that GCC 3.2.2 promotes all signed values to unsigned if any single vlaue is unsigned in an expression... for instance when calculating an elo touch position....evertyhign is an (int) except for cach_vinfo.xres which is unsigned. THerefore if y ou reverse the SDL_ELO_MIN_X and SDL_ELO_MAX_X values the resulging negative value pegs the expression to it's max. Attached it the accumu lated patch to typecast the unsigned values to (int) - *dx = (cache_vinfo.xres - (cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); + *dx = ((int)cache_vinfo.xres - ((int)cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); and also to provide quite failure to operations which have the screen currently locked... The touch screen I'm using the original values were exactly opposite of any position I touched on the screen - evaluating the math the expr ession SHOULD have handled reversing the min and max values - and after casting the unsigned .xres and .yres to a signed int - worked well. .. Jim
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Jan 2006 06:36:43 +0000
parents b8d311d90021
children c9b51268668f
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

#ifndef _SDL_aavideo_h
#define _SDL_aavideo_h

#include "SDL_mouse.h"
#include "SDL_sysvideo.h"
#include "SDL_mutex.h"

#include <aalib.h>

/* Hidden "this" pointer for the video functions */
#define _THIS	SDL_VideoDevice *this

#define SDL_NUMMODES 6

/* Private display data */
struct SDL_PrivateVideoData {
	SDL_Rect *SDL_modelist[SDL_NUMMODES+1];
	aa_context *context;
	aa_palette palette;
	aa_renderparams *rparams;
	double x_ratio, y_ratio;
    int w, h;
    SDL_mutex *mutex;
    int in_x11;
    void *buffer;
};

/* Old variable names */
#define SDL_modelist		(this->hidden->SDL_modelist)
#define AA_context		    (this->hidden->context)
#define AA_palette		    (this->hidden->palette)
#define AA_rparams		    (this->hidden->rparams)
#define AA_buffer		    (this->hidden->buffer)

#define AA_x_ratio		    (this->hidden->x_ratio)
#define AA_y_ratio		    (this->hidden->y_ratio)

#define AA_mutex		    (this->hidden->mutex)
#define AA_in_x11		    (this->hidden->in_x11)
#define AA_w                (this->hidden->w)
#define AA_h                (this->hidden->h)

#endif /* _SDL_aavideo_h */