plugins/libwmfun/fade.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 1.2  2001/04/21 07:12:30  dan
  26  * For libwraster:
  27  * ---------------
  28  *
  29  * - Added retain/release mechanism to RImage by adding RRetainImage() and
  30  *   RReleaseImage(). RDestroyImage() is an alias to RReleaseImage() now, but
  31  *   will be removed in a future release because it no longer fits with the
  32  *   semantics. Will be kept for a while to allow a smoother transition.
  33  *   More about in wrlib/NEWS
  34  *
  35  *
  36  * For WINGs:
  37  * ----------
  38  *
  39  * - Small API change:
  40  *   1. Renamed WMSetApplicationIconImage(), WMGetApplicationIconImage() and
  41  *      WMSetWindowMiniwindowImage() to respectively WMSetApplicationIconPixmap(),
  42  *      WMGetApplicationIconPixmap() and WMSetWindowMiniwindowPixmap()
  43  *      They operate on a WMPixmap which is practically an X Pixmap with no alpha
  44  *      channel information and the new name is more suggestive and also leaves
  45  *      room for the new functions added for operating on images with alpha info.
  46  *   2. Added WMSetApplicationIconImage() and WMGetApplicationIconImage() which
  47  *      operate on an RImage and store alpha information too.
  48  *   3. Added WMGetApplicationIconBlendedPixmap() which will take the image with
  49  *      alpha set by WMSetApplicationIconImage() and will blend it with a color.
  50  *      If color is NULL it will blend using the default panel color (#aeaaae)
  51  *   All these changes will allow WINGs to handle images with alpha blending
  52  *   correctly in panels and wherever else needed. More about in WINGs/NEWS.
  53  * - updated panels to use the newly available RImages if present and fallback
  54  *   to old WMPixmaps if not, to properly show alpha blended images.
  55  * - replaced some still left malloc's with wmalloc's.
  56  *
  57  *
  58  * For Window Maker:
  59  * -----------------
  60  * - Fixed wrong mapping position of the "Docked Applications Panel" for some
  61  *   icons.
  62  * - Smoother animation for the smiley =)
  63  * - Made images with alpha blending be shown correctly in the panels and the
  64  *   icon chooser.
  65  * - The icon image set to be shown in panels ("Logo.WMPanel") will be
  66  *   automatically updated if its entry in WMWindowAttributes changes (without
  67  *   a need to restart as until now).
  68  *
  69  *
  70  * *** Note!!! ***
  71  *
  72  * If you are developing applications with one of libwraster or libWINGs
  73  * then you should look to wrlib/NEWS and WINGs/NEWS to see what changed
  74  * and how should you update your code.
  75  *
  76  * Revision 1.1  2000/12/03 18:58:41  id
  77  * initiate plugins branch
  78  *
  79  * Revision 1.1.1.1  1999/02/21 17:16:47  gloth
  80  * initial revision
  81  *
  82  */
  83
  84 #include "getopt.h"
  85 #include <math.h>
  86 #include <stdlib.h>
  87 #include <time.h>
  88
  89 #include "generic.h"
  90
  91 RImage *fade (int argc, char **argv, int width, int height, int relief) {
  92
  93         int from[3] = { 0x00, 0x00, 0x00 };
  94         int to[3] = { 0xff, 0xff, 0xff };
  95         int *this, *last;
  96         RImage *image;
  97         unsigned char *cptr;
  98         int i, j;
  99         double factor, delta;
 100
 101         int c, done, option_index = 0;
 102
 103         optind = 1;
 104         for (done=0; !done; ) {
 105                 static struct option long_options[] = {
 106                         {"from", 1, 0, 'f'},
 107                         {"to", 1, 0, 't'},
 108                         {0, 0, 0, 0}
 109                 };
 110
 111                 c = getopt_long (argc, argv, "f:t:",
 112                         long_options, &option_index);
 113                 if (c == -1) {
 114                         break;
 115                 }
 116
 117                 switch (c) {
 118                 case 'f':
 119                         if (!parse_color (optarg, from)) {
 120                                 error ("invalid color: %s\n", optarg);
 121                                 return 0;
 122                         }
 123                         break;
 124                 case 't':
 125                         if (!parse_color (optarg, to)) {
 126                                 error ("invalid color: %s\n", optarg);
 127                                 return 0;
 128                         }
 129                         break;
 130                 default:
 131                         done = 1;
 132                         break;
 133                 }
 134         }
 135
 136         argc -= optind;
 137         argv += optind;
 138
 139         if (!start_image ("fade", argc, 0, 1, width, height, &image)) {
 140                 return (RImage *)0;
 141         }
 142
 143         this = (int *) malloc (width * sizeof (int));
 144         last = (int *) malloc (width * sizeof (int));
 145         if (!this || !last) {
 146                 RReleaseImage (image);
 147                 free (this);
 148                 free (last);
 149                 return (RImage *)0;
 150         }
 151
 152         for (i=0; i<width; i++) {
 153                 this[i] = 255;
 154         }
 155
 156         factor = pow (0.2, 1.0 / height);
 157         delta = (factor < 0.5) ? 2.0 * factor : 2.0 * (1.0 - factor);
 158
 159         srand (time (0));
 160
 161         cptr = image->data;
 162         for (j=0; j<height; j++) {
 163                 memcpy (last, this, width * sizeof (int));
 164                 for (i=0; i<width; i++) {
 165                         int output[3];
 166                         int k = i + random_int (3) - 1;
 167                         double f = factor + random_double (delta) - delta/2.0;
 168
 169                         if (k < 0) {
 170                                 k = 0;
 171                         }
 172                         if (k >= width) {
 173                                 k = width - 1;
 174                         }
 175
 176                         this[i] = (int) (f * last[k]);
 177                         interpolate_color (output, from, to, this[i]);
 178                         *cptr++ = output[0];
 179                         *cptr++ = output[1];
 180                         *cptr++ = output[2];
 181                         if (RRGBAFormat==image->format)
 182                                 cptr++;
 183                 }
 184         }
 185
 186         free (this);
 187         free (last);
 188
 189         return image;
 190 }
 191