client/gui-stub/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 /* utility */
  19 #include "mem.h"
  20
  21 /* common */
  22 #include "rgbcolor.h"
  23
  24 /* gui main header */
  25 #include "gui_stub.h"
  26
  27 #include "colors.h"
  28
  29 /****************************************************************************
  30   Allocate a color (adjusting it for our colormap if necessary on paletted
  31   systems) and return a pointer to it.
  32 ****************************************************************************/
  33 struct color *gui_color_alloc(int r, int g, int b)
  34 {
  35   struct color *color = fc_malloc(sizeof(*color));
  36
  37   /* PORTME */
  38   color->r = r;
  39   color->g = g;
  40   color->b = b;
  41
  42   return color;
  43 }
  44
  45 /****************************************************************************
  46   Free a previously allocated color.  See color_alloc.
  47 ****************************************************************************/
  48 void gui_color_free(struct color *color)
  49 {
  50   /* PORTME */
  51   free(color);
  52 }
  53
  54 /****************************************************************************
  55   Return a number indicating the perceptual brightness of this color
  56   relative to others (larger is brighter).
  57 ****************************************************************************/
  58 int color_brightness_score(struct color *pcolor)
  59 {
  60   /* PORTME */
  61   /* Can use GUI-specific colorspace functions here. This is a fallback
  62    * using platform-independent code */
  63   struct rgbcolor *prgb = rgbcolor_new(pcolor->r, pcolor->g, pcolor->b);
  64   int score = rgbcolor_brightness_score(prgb);
  65
  66   rgbcolor_destroy(prgb);
  67   return score;
  68 }