client/gui-gtk-2.0/colors.c

   1 /**********************************************************************
   2  Freeciv - Copyright (C) 1996 - A Kjeldberg, L Gregersen, P Unold
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; either version 2, or (at your option)
   6    any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12 ***********************************************************************/
  13
  14 #ifdef HAVE_CONFIG_H
  15 #include <fc_config.h>
  16 #endif
  17
  18 #include <stdio.h>
  19
  20 #include <gtk/gtk.h>
  21
  22 #include "log.h"
  23 #include "mem.h"
  24
  25 #include "rgbcolor.h"
  26
  27 #include "gui_main.h"
  28
  29 #include "colors.h"
  30
  31 /*************************************************************
  32   Get display color type of default visual
  33 *************************************************************/
  34 enum Display_color_type get_visual(void)
  35 {
  36   GdkVisual *visual;
  37
  38   gtk_widget_push_colormap (gdk_rgb_get_colormap());
  39
  40   visual = gtk_widget_get_default_visual();
  41
  42   if (visual->type == GDK_VISUAL_STATIC_GRAY) {
  43     /* StaticGray, use black and white */
  44     log_verbose("found B/W display.");
  45     return BW_DISPLAY;
  46   }
  47
  48   if(visual->type < GDK_VISUAL_STATIC_COLOR) {
  49     /* No color visual available at default depth */
  50     log_verbose("found grayscale(?) display.");
  51     return GRAYSCALE_DISPLAY;
  52   }
  53
  54   log_verbose("color system booted ok.");
  55
  56   return COLOR_DISPLAY;
  57 }
  58
  59 /****************************************************************************
  60   Allocate a color (adjusting it for our colormap if necessary on paletted
  61   systems) and return a pointer to it.
  62 ****************************************************************************/
  63 struct color *color_alloc(int r, int g, int b)
  64 {
  65   struct color *color = fc_malloc(sizeof(*color));
  66   GdkColormap *cmap = gtk_widget_get_default_colormap();
  67
  68   color->color.red = (r << 8) + r;
  69   color->color.green = (g << 8) + g;
  70   color->color.blue = (b << 8) + b;
  71   gdk_rgb_find_color(cmap, &color->color);
  72
  73   return color;
  74 }
  75
  76 /****************************************************************************
  77   Free a previously allocated color.  See color_alloc.
  78 ****************************************************************************/
  79 void color_free(struct color *color)
  80 {
  81   free(color);
  82 }
  83
  84 /****************************************************************************
  85   Return a number indicating the perceptual brightness of this color
  86   relative to others (larger is brighter).
  87 ****************************************************************************/
  88 int color_brightness_score(struct color *pcolor)
  89 {
  90   struct rgbcolor *prgb = rgbcolor_new(pcolor->color.red >> 8,
  91                                        pcolor->color.green >> 8,
  92                                        pcolor->color.blue >> 8);
  93   int score = rgbcolor_brightness_score(prgb);
  94
  95   rgbcolor_destroy(prgb);
  96   return score;
  97 }
  98
  99 /****************************************************************************
 100   Fill the string with the color in "#rrggbb" mode.  Use it instead of
 101   gdk_color() which have been included in gtk2.12 version only.
 102 ****************************************************************************/
 103 size_t color_to_string(GdkColor *color, char *string, size_t length)
 104 {
 105   fc_assert_ret_val(NULL != string, 0);
 106   fc_assert_ret_val(0 < length, 0);
 107
 108   if (NULL == color) {
 109     string[0] = '\0';
 110     return 0;
 111   } else {
 112     return fc_snprintf(string, length, "#%02x%02x%02x",
 113                        color->red >> 8, color->green >> 8, color->blue >> 8);
 114   }
 115 }