client/gui-gtk-3.22/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 /* utility */
  23 #include "log.h"
  24 #include "mem.h"
  25
  26 /* common */
  27 #include "rgbcolor.h"
  28
  29 /* client/gui-gtk-3.22 */
  30 #include "gui_main.h"
  31
  32 #include "colors.h"
  33
  34 /*************************************************************
  35   Get display color type of default visual
  36 *************************************************************/
  37 enum Display_color_type get_visual(void)
  38 {
  39   GdkVisual *visual;
  40   GdkVisualType type;
  41
  42   visual = gdk_screen_get_system_visual(gdk_screen_get_default());
  43   type = gdk_visual_get_visual_type(visual);
  44
  45   if (type == GDK_VISUAL_STATIC_GRAY) {
  46     /* StaticGray, use black and white */
  47     log_verbose("found B/W display.");
  48     return BW_DISPLAY;
  49   }
  50
  51   if(type < GDK_VISUAL_STATIC_COLOR) {
  52     /* No color visual available at default depth */
  53     log_verbose("found grayscale(?) display.");
  54     return GRAYSCALE_DISPLAY;
  55   }
  56
  57   log_verbose("color system booted ok.");
  58
  59   return COLOR_DISPLAY;
  60 }
  61
  62 /****************************************************************************
  63   Allocate a color (well, sort of)
  64   and return a pointer to it.
  65 ****************************************************************************/
  66 struct color *color_alloc(int r, int g, int b)
  67 {
  68   struct color *color = fc_malloc(sizeof(*color));
  69
  70   color->color.red = (double)r/255;
  71   color->color.green = (double)g/255;
  72   color->color.blue = (double)b/255;
  73   color->color.alpha = 1.0;
  74
  75   return color;
  76 }
  77
  78 /****************************************************************************
  79   Free a previously allocated color.  See color_alloc.
  80 ****************************************************************************/
  81 void color_free(struct color *color)
  82 {
  83   free(color);
  84 }
  85
  86 /****************************************************************************
  87   Return a number indicating the perceptual brightness of this color
  88   relative to others (larger is brighter).
  89 ****************************************************************************/
  90 int color_brightness_score(struct color *pcolor)
  91 {
  92   struct rgbcolor *prgb = rgbcolor_new(pcolor->color.red * 255,
  93                                        pcolor->color.green * 255,
  94                                        pcolor->color.blue * 255);
  95   int score = rgbcolor_brightness_score(prgb);
  96
  97   rgbcolor_destroy(prgb);
  98   return score;
  99 }