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annotate src/video/x11/SDL_x11dyn.c @ 2885:ca6499468250

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author Sam Lantinga <slouken@libsdl.org>
date Sat, 20 Dec 2008 12:32:25 +0000
parents 99210400e8b9
children 54fac87e1f34
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
1950
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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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 #define DEBUG_DYNAMIC_X11 0
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25
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26 #include "SDL_x11dyn.h"
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27
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28 #if DEBUG_DYNAMIC_X11
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29 #include <stdio.h>
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30 #endif
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31
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32 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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33
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34 #include "SDL_name.h"
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35 #include "SDL_loadso.h"
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36
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37 typedef struct
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38 {
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39 void *lib;
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40 const char *libname;
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41 } x11dynlib;
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42
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43 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC
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44 #define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL
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45 #endif
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46 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
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47 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
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48 #endif
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49 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER
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50 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER NULL
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51 #endif
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52 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
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53 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
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54 #endif
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55 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT
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56 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT NULL
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57 #endif
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58
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59 static x11dynlib x11libs[] = {
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60 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},
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61 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT},
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62 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER},
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63 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR},
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64 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT},
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65 };
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66
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67 static void
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68 X11_GetSym(const char *fnname, int *rc, void **fn)
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69 {
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70 int i;
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71 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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72 if (x11libs[i].lib != NULL) {
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73 *fn = SDL_LoadFunction(x11libs[i].lib, fnname);
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74 if (*fn != NULL)
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75 break;
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76 }
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77 }
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78
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79 #if DEBUG_DYNAMIC_X11
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80 if (*fn != NULL)
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81 printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname,
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82 *fn);
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83 else
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84 printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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85 #endif
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86
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87 if (*fn == NULL)
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88 *rc = 0; /* kill this module. */
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89 }
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90
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91
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92 /* Define all the function pointers and wrappers... */
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93 #define SDL_X11_MODULE(modname)
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94 #define SDL_X11_SYM(rc,fn,params,args,ret) \
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95 static rc (*p##fn) params = NULL; \
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96 rc fn params { ret p##fn args ; }
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97 #include "SDL_x11sym.h"
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98 #undef SDL_X11_MODULE
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99 #undef SDL_X11_SYM
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100 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
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101
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102 /* Annoying varargs entry point... */
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103 #ifdef X_HAVE_UTF8_STRING
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104 XIC(*pXCreateIC) (XIM,...) = NULL;
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105 char *(*pXGetICValues) (XIC, ...) = NULL;
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106 #endif
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107
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108 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
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109 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
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110 #define SDL_X11_SYM(rc,fn,params,args,ret)
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111 #include "SDL_x11sym.h"
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112 #undef SDL_X11_MODULE
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113 #undef SDL_X11_SYM
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114
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115
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116 static int x11_load_refcount = 0;
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117
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118 void
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119 SDL_X11_UnloadSymbols(void)
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120 {
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121 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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122 /* Don't actually unload if more than one module is using the libs... */
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123 if (x11_load_refcount > 0) {
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124 if (--x11_load_refcount == 0) {
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125 int i;
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126
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127 /* set all the function pointers to NULL. */
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128 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
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129 #define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
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130 #include "SDL_x11sym.h"
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131 #undef SDL_X11_MODULE
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132 #undef SDL_X11_SYM
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133
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134 #ifdef X_HAVE_UTF8_STRING
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135 pXCreateIC = NULL;
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136 pXGetICValues = NULL;
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137 #endif
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138
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139 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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140 if (x11libs[i].lib != NULL) {
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141 SDL_UnloadObject(x11libs[i].lib);
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142 x11libs[i].lib = NULL;
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143 }
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144 }
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145 }
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146 }
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147 #endif
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148 }
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149
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150 /* returns non-zero if all needed symbols were loaded. */
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151 int
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152 SDL_X11_LoadSymbols(void)
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153 {
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154 int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
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155
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156 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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157 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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158 if (x11_load_refcount++ == 0) {
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159 int i;
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160 int *thismod = NULL;
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161 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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162 if (x11libs[i].libname != NULL) {
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163 x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
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164 }
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165 }
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166 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
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167 #define SDL_X11_SYM(a,fn,x,y,z) X11_GetSym(#fn,thismod,(void**)&p##fn);
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168 #include "SDL_x11sym.h"
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169 #undef SDL_X11_MODULE
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170 #undef SDL_X11_SYM
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171
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172 #ifdef X_HAVE_UTF8_STRING
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173 X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8, (void **) &pXCreateIC);
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174 X11_GetSym("XGetICValues", &SDL_X11_HAVE_UTF8,
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175 (void **) &pXGetICValues);
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176 #endif
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177
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178 if (SDL_X11_HAVE_BASEXLIB) {
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179 /* all required symbols loaded. */
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180 SDL_ClearError();
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181 } else {
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182 /* in case something got loaded... */
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183 SDL_X11_UnloadSymbols();
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184 rc = 0;
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185 }
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186 }
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187 #else
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188 #ifdef X_HAVE_UTF8_STRING
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189 pXCreateIC = XCreateIC;
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190 pXGetICValues = XGetICValues;
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191 #endif
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192 #endif
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193
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194 return rc;
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195 }
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196
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197 /* vi: set ts=4 sw=4 expandtab: */