plugins/libwmfun/generic.c

   1 /*
   2  *  libwmfun - WindowMaker texture function library
   3  *  Copyright (C) 1999 Tobias Gloth
   4  *
   5  *  This program 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 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program 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 this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  18  *  USA.
  19  */
  20
  21 /*
  22  * $Id$
  23  *
  24  * $Log$
  25  * Revision 1.1  2000/12/03 18:58:41  id
  26  * initiate plugins branch
  27  *
  28  * Revision 1.1.1.1  1999/02/21 17:16:47  gloth
  29  * initial revision
  30  *
  31  */
  32
  33 #include <stdarg.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36
  37 #include "generic.h"
  38
  39 static Display *dpy = 0;
  40 static Colormap cmap;
  41
  42 void initWindowMaker(Display * d, Colormap c)
  43 {
  44         if (!d) {
  45                 return;
  46         }
  47         dpy = d;
  48         cmap = c;
  49 }
  50
  51 void error(const char *format, ...)
  52 {
  53         va_list args;
  54         va_start(args, format);
  55         vfprintf(stderr, format, args);
  56         va_end(args);
  57 }
  58
  59 int parse_color(const char *string, int *result)
  60 {
  61         XColor color;
  62
  63         if (!XParseColor(dpy, cmap, string, &color)) {
  64                 return 0;
  65         }
  66         result[0] = color.red >> 8;
  67         result[1] = color.green >> 8;
  68         result[2] = color.blue >> 8;
  69
  70         return 1;
  71 }
  72
  73 int parse_xcolor(const char *string, XColor * xcolor)
  74 {
  75         if (!XParseColor(dpy, cmap, string, xcolor)) {
  76                 return 0;
  77         }
  78         if (!XAllocColor(dpy, cmap, xcolor)) {
  79                 return 0;
  80         }
  81
  82         return 1;
  83 }
  84
  85 void interpolate_color(int *t, const int *s0, const int *s1, int mix)
  86 {
  87         t[0] = (mix * s0[0] + (255 - mix) * s1[0]) >> 8;
  88         t[1] = (mix * s0[1] + (255 - mix) * s1[1]) >> 8;
  89         t[2] = (mix * s0[2] + (255 - mix) * s1[2]) >> 8;
  90 }
  91
  92 int random_int(int range)
  93 {
  94         return rand() / (RAND_MAX / range + 1);
  95 }
  96
  97 double random_double(double range)
  98 {
  99         return ((double)rand()) / (((double)RAND_MAX) / range);
 100 }
 101
 102 int start_image(const char *name, int argc, int argc_min, int argc_max, int width, int height, RImage ** image)
 103 {
 104
 105         if (!dpy) {
 106                 error("%s: library not initialized\n", name);
 107                 return 0;
 108         }
 109
 110         if ((argc < argc_min) || (argc >= argc_max)) {
 111                 error("%s: invalid number of parameters: \n", name, argc);
 112                 return 0;
 113         }
 114
 115         *image = RCreateImage(width, height, 0);
 116         if (!*image) {
 117                 error("%s: can't create image\n", name);
 118                 return 0;
 119         }
 120         return 1;
 121 }