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         if (!d) {
  44                 return;
  45         }
  46         dpy = d;
  47         cmap = c;
  48 }
  49
  50 void error (const char *format, ...) {
  51         va_list args;
  52         va_start (args, format);
  53         vfprintf (stderr, format, args);
  54         va_end (args);
  55 }
  56
  57 int parse_color (const char *string, int *result) {
  58         XColor color;
  59
  60         if (!XParseColor (dpy, cmap, string, &color)) {
  61                 return 0;
  62         }
  63         result[0] = color.red >> 8;
  64         result[1] = color.green >> 8;
  65         result[2] = color.blue >> 8;
  66
  67         return 1;
  68 }
  69
  70 int parse_xcolor (const char *string, XColor *xcolor) {
  71         if (!XParseColor (dpy, cmap, string, xcolor)) {
  72         return 0;
  73         }
  74     if (!XAllocColor (dpy, cmap, xcolor)) {
  75         return 0;
  76     }
  77
  78         return 1;
  79 }
  80
  81 void interpolate_color (int *t, const int *s0, const int *s1, int mix) {
  82         t[0] = (mix * s0[0] + (255 - mix) * s1[0]) >> 8;
  83         t[1] = (mix * s0[1] + (255 - mix) * s1[1]) >> 8;
  84         t[2] = (mix * s0[2] + (255 - mix) * s1[2]) >> 8;
  85 }
  86
  87 int random_int (int range) {
  88         return rand() / (RAND_MAX / range + 1);
  89 }
  90
  91 double random_double (double range) {
  92         return ((double)rand()) / (((double)RAND_MAX) / range);
  93 }
  94
  95 int start_image (const char *name,
  96         int argc, int argc_min, int argc_max,
  97         int width, int height, RImage **image) {
  98
  99         if (!dpy) {
 100                 error ("%s: library not initialized\n", name);
 101                 return 0;
 102         }
 103
 104         if ((argc < argc_min) || (argc >= argc_max)) {
 105                 error ("%s: invalid number of parameters: \n", name, argc);
 106                 return 0;
 107         }
 108
 109         *image = RCreateImage (width, height, 0);
 110         if (!*image) {
 111                 error ("%s: can't create image\n", name);
 112                 return 0;
 113         }
 114         return 1;
 115 }
 116