client/gui-qt/colors.cpp

   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 /* utility */
  19 #include "mem.h"
  20
  21 // gui-qt
  22 #include "colors.h"
  23 #include "qtg_cxxside.h"
  24
  25 /****************************************************************************
  26   Allocate a color (adjusting it for our colormap if necessary on paletted
  27   systems) and return a pointer to it.
  28 ****************************************************************************/
  29 struct color *qtg_color_alloc(int r, int g, int b)
  30 {
  31   struct color *pcolor = new color;
  32
  33   pcolor->qcolor.setRgb(r, g, b);
  34
  35   return pcolor;
  36 }
  37
  38 /****************************************************************************
  39   Free a previously allocated color.  See qtg_color_alloc.
  40 ****************************************************************************/
  41 void qtg_color_free(struct color *pcolor)
  42 {
  43   delete pcolor;
  44 }
  45
  46 /****************************************************************************
  47   Return a number indicating the perceptual brightness of this color
  48   relative to others (larger is brighter).
  49 ****************************************************************************/
  50 int color_brightness_score(struct color *pcolor)
  51 {
  52   /* QColor has color space conversions, but nothing giving a perceptually
  53    * even color space */
  54   struct rgbcolor *prgb = rgbcolor_new(pcolor->qcolor.red(),
  55                                        pcolor->qcolor.green(),
  56                                        pcolor->qcolor.blue());
  57   int score = rgbcolor_brightness_score(prgb);
  58
  59   rgbcolor_destroy(prgb);
  60   return score;
  61 }