client/gui-sdl2/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 /***********************************************************************
  15                           colors.c  -  description
  16                              -------------------
  17     begin                : Mon Jul 15 2002
  18     copyright            : (C) 2002 by Rafał Bursig
  19     email                : Rafał Bursig <bursig@poczta.fm>
  20 ***********************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <fc_config.h>
  24 #endif
  25
  26 /* SDL2 */
  27 #ifdef SDL2_PLAIN_INCLUDE
  28 #include <SDL.h>
  29 #else  /* SDL2_PLAIN_INCLUDE */
  30 #include <SDL2/SDL.h>
  31 #endif /* SDL2_PLAIN_INCLUDE */
  32
  33 /* client */
  34 #include "tilespec.h"
  35
  36 /* gui-sdl2 */
  37 #include "themespec.h"
  38
  39 #include "colors.h"
  40
  41 /**************************************************************************
  42   Get color from theme.
  43 **************************************************************************/
  44 SDL_Color *get_theme_color(enum theme_color themecolor)
  45 {
  46   return theme_get_color(theme, themecolor)->color;
  47 }
  48
  49 /**************************************************************************
  50   Get color for some game object instance.
  51 **************************************************************************/
  52 SDL_Color *get_game_color(enum color_std stdcolor)
  53 {
  54   return get_color(tileset, stdcolor)->color;
  55 }
  56
  57 /****************************************************************************
  58   Allocate a color with alpha channel and return a pointer to it. Alpha
  59   channel is not really used yet.
  60 ****************************************************************************/
  61 struct color *color_alloc_rgba(int r, int g, int b, int a)
  62 {
  63   struct color *result = fc_malloc(sizeof(*result));
  64   SDL_Color *pcolor = fc_malloc(sizeof(*pcolor));
  65
  66   pcolor->r = r;
  67   pcolor->g = g;
  68   pcolor->b = b;
  69   pcolor->a = a;
  70
  71   result->color = pcolor;
  72
  73   return result;
  74 }
  75
  76 /****************************************************************************
  77   Allocate a solid color and return a pointer to it.
  78 ****************************************************************************/
  79 struct color *color_alloc(int r, int g, int b)
  80 {
  81   struct color *result = fc_malloc(sizeof(*result));
  82   SDL_Color *pcolor = fc_malloc(sizeof(*pcolor));
  83
  84   pcolor->r = r;
  85   pcolor->g = g;
  86   pcolor->b = b;
  87   pcolor->a = 255;
  88
  89   result->color = pcolor;
  90
  91   return result;
  92 }
  93
  94 /****************************************************************************
  95   Free resources allocated for color.
  96 ****************************************************************************/
  97 void color_free(struct color *pcolor)
  98 {
  99   if (!pcolor) {
 100     return;
 101   }
 102
 103   if (pcolor->color) {
 104     free(pcolor->color);
 105   }
 106
 107   free(pcolor);
 108 }
 109
 110 /****************************************************************************
 111   Return a number indicating the perceptual brightness of this color
 112   relative to others (larger is brighter).
 113 ****************************************************************************/
 114 int color_brightness_score(struct color *pcolor)
 115 {
 116   struct rgbcolor *prgb = rgbcolor_new(pcolor->color->r,
 117                                        pcolor->color->g,
 118                                        pcolor->color->b);
 119   int score = rgbcolor_brightness_score(prgb);
 120
 121   rgbcolor_destroy(prgb);
 122   return score;
 123 }