gtk/colors.c

   1 /* colors.c
   2  * Routines for colors
   3  *
   4  * $Id$
   5  *
   6  * Ethereal - Network traffic analyzer
   7  * By Gerald Combs <gerald@ethereal.com>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  23  */
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <gtk/gtk.h>
  29
  30 #include <string.h>
  31
  32 #include "color.h"      /* to declare "color_t" */
  33
  34 #include "colors.h"
  35 #include "simple_dialog.h"
  36 #include "gtkglobals.h"
  37
  38 static GdkColormap*     sys_cmap;
  39 static GdkColormap*     our_cmap = NULL;
  40
  41 GdkColor        WHITE = { 0, 65535, 65535, 65535 };
  42 GdkColor        BLACK = { 0, 0, 0, 0 };
  43
  44 /* Initialize the colors */
  45 void
  46 colors_init(void)
  47 {
  48         gboolean got_white, got_black;
  49
  50         sys_cmap = gdk_colormap_get_system();
  51
  52         /* Allocate "constant" colors. */
  53         got_white = get_color(&WHITE);
  54         got_black = get_color(&BLACK);
  55
  56         /* Got milk? */
  57         if (!got_white) {
  58                 if (!got_black)
  59                         simple_dialog(ESD_TYPE_WARN, ESD_BTN_OK,
  60                             "Could not allocate colors black or white.");
  61                 else
  62                         simple_dialog(ESD_TYPE_WARN, ESD_BTN_OK,
  63                             "Could not allocate color white.");
  64         } else {
  65                 if (!got_black)
  66                         simple_dialog(ESD_TYPE_WARN, ESD_BTN_OK,
  67                             "Could not allocate color black.");
  68         }
  69 }
  70
  71 /* allocate a color from the color map */
  72 gboolean
  73 get_color(GdkColor *new_color)
  74 {
  75         GdkVisual *pv;
  76
  77         if (!our_cmap) {
  78                 if (!gdk_colormap_alloc_color (sys_cmap, new_color, FALSE,
  79                     TRUE)) {
  80                         pv = gdk_visual_get_best();
  81                         if (!(our_cmap = gdk_colormap_new(pv, TRUE))) {
  82                                 simple_dialog(ESD_TYPE_WARN, ESD_BTN_OK,
  83                                     "Could not create new colormap");
  84                         }
  85                 } else
  86                         return (TRUE);
  87         }
  88         return (gdk_colormap_alloc_color(our_cmap, new_color, FALSE, TRUE));
  89 }
  90
  91 void
  92 color_t_to_gdkcolor(GdkColor *target, color_t *source)
  93 {
  94         target->pixel = source->pixel;
  95         target->red   = source->red;
  96         target->green = source->green;
  97         target->blue  = source->blue;
  98 }
  99
 100 void
 101 gdkcolor_to_color_t(color_t *target, GdkColor *source)
 102 {
 103         target->pixel = source->pixel;
 104         target->red   = source->red;
 105         target->green = source->green;
 106         target->blue  = source->blue;
 107 }