sushivision/scale.h

   1 /*
   2  *
   3  *     sushivision copyright (C) 2006-2007 Monty <monty@xiph.org>
   4  *
   5  *  sushivision is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2, or (at your option)
   8  *  any later version.
   9  *
  10  *  sushivision is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with sushivision; see the file COPYING.  If not, write to the
  17  *  Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  *
  20  */
  21
  22 typedef struct {
  23   double lo;
  24   double hi;
  25   int neg;
  26
  27   long long first_val;
  28   long first_pixel;
  29   long step_pixel;
  30
  31   int five_exponent;
  32   int two_exponent;
  33   double expm;
  34
  35   int init;
  36   int pixels;
  37   int spacing;
  38   int massaged; // set if range had to be adjusted to avoid underflows
  39 } _sv_scalespace_t;
  40
  41 extern double _sv_scalespace_scaledel(_sv_scalespace_t *from, _sv_scalespace_t *to);
  42 extern long _sv_scalespace_scalenum(_sv_scalespace_t *from, _sv_scalespace_t *to);
  43 extern long _sv_scalespace_scaleden(_sv_scalespace_t *from, _sv_scalespace_t *to);
  44 extern long _sv_scalespace_scaleoff(_sv_scalespace_t *from, _sv_scalespace_t *to);
  45 extern long _sv_scalespace_scalebin(_sv_scalespace_t *from, _sv_scalespace_t *to);
  46 extern double _sv_scalespace_value(_sv_scalespace_t *s, double pixel);
  47 extern double _sv_scalespace_pixel(_sv_scalespace_t *s, double val);
  48 extern int _sv_scalespace_mark(_sv_scalespace_t *s, int num);
  49 extern double _sv_scalespace_label(_sv_scalespace_t *s, int num, char *buffer);
  50 extern _sv_scalespace_t _sv_scalespace_linear (double lowpoint, double highpoint, int pixels, int max_spacing);
  51 extern void _sv_scalespace_double(_sv_scalespace_t *s);
  52 extern int _sv_scalespace_decimal_exponent(_sv_scalespace_t *s);