calibrate.h

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00001 /*
00002  * File Name: calibrate.h
00003  */
00004 
00005 /*
00006  * This file is part of gtktscal.
00007  *
00008  * gtktscal is free software: you can redistribute it and/or modify
00009  * it under the terms of the GNU General Public License as published by
00010  * the Free Software Foundation, either version 2 of the License, or
00011  * (at your option) any later version.
00012  *
00013  * gtktscal is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
00016  * GNU General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU General Public License
00019  * along with this program. If not, see <http://www.gnu.org/licenses/>.
00020  */
00021 
00022 /*
00023  * This code is originally from:
00024  * 
00025  *  tslib/tests/ts_calibrate.c
00026  *
00027  *  Copyright (C) 2001 Russell King.
00028  *
00029  * Modifications:
00030  *
00031  *  Copyright (C) 2008 iRex Technologies B.V.
00032  */
00033  
00034 #define CAL_XK   0
00035 #define CAL_XX   1
00036 #define CAL_XY   2
00037 #define CAL_YK   3
00038 #define CAL_YX   4
00039 #define CAL_YY   5
00040 #define CAL_S    6
00041 
00042 #define NR_POINTS 5
00043 typedef struct {
00044    int x[NR_POINTS], xfb[NR_POINTS], xscr[NR_POINTS];
00045    int y[NR_POINTS], yfb[NR_POINTS], yscr[NR_POINTS];
00046    int a[7];
00047 } calibration;
00048 
00049 extern int perform_calibration(calibration *cal);