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annotate src/SDL_hints.c @ 5195:ef5a61ea3202

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Added the SDL_HINT_RENDER_DRIVER and SDL_HINT_RENDER_VSYNC hints.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 05 Feb 2011 10:35:36 -0800
parents 6f6a9340fb93
children 01bced9a4cc1
rev   line source
5192
6f6a9340fb93 Added a hint system to allow configuration hints to be specified by the application.
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_hints.h"
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25
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26
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27 /* Assuming there aren't many hints set and they aren't being queried in
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28 critical performance paths, we'll just use a linked list here.
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29 */
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30 typedef struct SDL_Hint {
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31 char *name;
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32 char *value;
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33 SDL_HintPriority priority;
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34 struct SDL_Hint *next;
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35 } SDL_Hint;
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36
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37 static SDL_Hint *SDL_hints;
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38
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39
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40 SDL_bool
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41 SDL_SetHint(const char *name, const char *value, SDL_HintPriority priority)
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42 {
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43 const char *env;
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44 SDL_Hint *prev, *hint;
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45
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46 if (!name || !value) {
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47 return SDL_FALSE;
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48 }
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49
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50 env = SDL_getenv(name);
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51 if (env && priority < SDL_HINT_OVERRIDE) {
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52 return SDL_FALSE;
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53 }
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54
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55 prev = NULL;
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56 for (hint = SDL_hints; hint; prev = hint, hint = hint->next) {
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57 if (SDL_strcmp(name, hint->name) == 0) {
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58 if (priority < hint->priority) {
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59 return SDL_FALSE;
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60 }
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61 if (SDL_strcmp(hint->value, value) != 0) {
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62 SDL_free(hint->value);
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63 hint->value = SDL_strdup(value);
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64 }
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65 hint->priority = priority;
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66 return SDL_TRUE;
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67 }
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68 }
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69
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70 /* Couldn't find the hint, add a new one */
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71 hint = (SDL_Hint *)SDL_malloc(sizeof(*hint));
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72 if (!hint) {
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73 return SDL_FALSE;
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74 }
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75 hint->name = SDL_strdup(name);
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76 hint->value = SDL_strdup(value);
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77 hint->priority = priority;
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78 hint->next = SDL_hints;
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79 SDL_hints = hint;
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80 return SDL_TRUE;
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81 }
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82
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83 const char *
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84 SDL_GetHint(const char *name)
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85 {
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86 const char *env;
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87 SDL_Hint *hint;
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88
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89 env = SDL_getenv(name);
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90 for (hint = SDL_hints; hint; hint = hint->next) {
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91 if (SDL_strcmp(name, hint->name) == 0) {
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92 if (!env || hint->priority == SDL_HINT_OVERRIDE) {
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93 return hint->value;
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94 }
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95 break;
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96 }
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97 }
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98 return env;
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99 }
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100
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101 void SDL_ClearHints()
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102 {
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103 SDL_Hint *hint;
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104
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105 while (SDL_hints) {
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106 hint = SDL_hints;
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107 SDL_hints = hint->next;
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108
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109 SDL_free(hint->name);
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110 SDL_free(hint->value);
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111 SDL_free(hint);
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112 }
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113 }
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114
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115 /* vi: set ts=4 sw=4 expandtab: */