pidgin/gtkstyle.c

   1 /*
   2  * @file gtkstyle.c GTK+ Style utility functions
   3  * @ingroup pidgin
   4  */
   5
   6 /* pidgin
   7  *
   8  * Pidgin is the legal property of its developers, whose names are too numerous
   9  * to list here.  Please refer to the COPYRIGHT file distributed with this
  10  * source distribution.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  25  *
  26  */
  27 #include "gtkstyle.h"
  28
  29 /* Assume light mode */
  30 static gboolean dark_mode_cache = FALSE;
  31
  32 gboolean
  33 pidgin_style_is_dark(GtkStyle *style) {
  34         GdkColor bg;
  35
  36         if (!style) {
  37                 return dark_mode_cache;
  38         }
  39
  40         bg = style->base[GTK_STATE_NORMAL];
  41
  42         if (bg.red != 0xFFFF || bg.green != 0xFFFF || bg.blue != 0xFFFF) {
  43                 dark_mode_cache =  ((int) bg.red + (int) bg.green + (int) bg.blue) < (65536 * 3 / 2);
  44         }
  45
  46         return dark_mode_cache;
  47 }
  48
  49 void
  50 pidgin_style_adjust_contrast(GtkStyle *style, GdkRGBA *rgba) {
  51         if (pidgin_style_is_dark(style)) {
  52                 gdouble h, s, v;
  53
  54                 gtk_rgb_to_hsv(rgba->red, rgba->green, rgba->blue, &h, &s, &v);
  55
  56                 v += 0.3;
  57                 v = v > 1.0 ? 1.0 : v;
  58                 s = 0.7;
  59
  60                 gtk_hsv_to_rgb(h, s, v, &rgba->red, &rgba->green, &rgba->blue);
  61         }
  62 }