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annotate src/video/x11/SDL_x11dyn.c @ 1743:70a4d819e95e

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Future proof C++ code
author Sam Lantinga <slouken@libsdl.org>
date Fri, 28 Apr 2006 05:43:58 +0000
parents 9f59d4c5aaea
children 14717b52abc0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 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
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56 static x11dynlib x11libs[] =
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57 {
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58 { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC },
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59 { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT },
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60 { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER },
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61 { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR },
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62 };
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63
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64 static void *X11_GetSym(const char *fnname, int *rc)
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65 {
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66 int i;
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67 void *fn = NULL;
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68 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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69 if (x11libs[i].lib != NULL)
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70 {
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71 fn = SDL_LoadFunction(x11libs[i].lib, fnname);
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72 if (fn != NULL)
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73 break;
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74 }
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75 }
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76
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77 #if DEBUG_DYNAMIC_X11
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78 if (fn != NULL)
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79 printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, fn);
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80 else
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81 printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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82 #endif
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83
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84 if (fn == NULL)
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85 *rc = 0; /* kill this module. */
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86
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87 return fn;
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88 }
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89
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90
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91 /* Define all the function pointers and wrappers... */
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92 #define SDL_X11_MODULE(modname)
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93 #define SDL_X11_SYM(rc,fn,params,args,ret) \
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94 static rc (*p##fn) params = NULL; \
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95 rc fn params { ret p##fn args ; }
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96 #include "SDL_x11sym.h"
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97 #undef SDL_X11_MODULE
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98 #undef SDL_X11_SYM
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99 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
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100
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101 /* Annoying varargs entry point... */
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102 #ifdef X_HAVE_UTF8_STRING
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103 XIC (*pXCreateIC)(XIM,...) = NULL;
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104 #endif
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105
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106 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
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107 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
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108 #define SDL_X11_SYM(rc,fn,params,args,ret)
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109 #include "SDL_x11sym.h"
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110 #undef SDL_X11_MODULE
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111 #undef SDL_X11_SYM
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112
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113
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114 static int x11_load_refcount = 0;
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115
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116 void SDL_X11_UnloadSymbols(void)
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117 {
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118 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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119 /* Don't actually unload if more than one module is using the libs... */
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120 if (x11_load_refcount > 0) {
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121 if (--x11_load_refcount == 0) {
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122 int i;
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123
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124 /* set all the function pointers to NULL. */
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125 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
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126 #define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
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127 #include "SDL_x11sym.h"
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128 #undef SDL_X11_MODULE
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129 #undef SDL_X11_SYM
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130
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131 #ifdef X_HAVE_UTF8_STRING
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132 pXCreateIC = NULL;
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133 #endif
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134
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135 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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136 if (x11libs[i].lib != NULL) {
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137 SDL_UnloadObject(x11libs[i].lib);
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138 x11libs[i].lib = NULL;
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139 }
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140 }
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141 }
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142 }
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143 #endif
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144 }
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145
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146 /* returns non-zero if all needed symbols were loaded. */
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147 int SDL_X11_LoadSymbols(void)
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148 {
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149 int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
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150
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151 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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152 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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153 if (x11_load_refcount++ == 0) {
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154 int i;
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155 int *thismod = NULL;
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156 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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157 if (x11libs[i].libname != NULL) {
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158 x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
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159 }
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160 }
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161 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
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162 #define SDL_X11_SYM(a,fn,x,y,z) p##fn = X11_GetSym(#fn,thismod);
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163 #include "SDL_x11sym.h"
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164 #undef SDL_X11_MODULE
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165 #undef SDL_X11_SYM
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166
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167 #ifdef X_HAVE_UTF8_STRING
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168 pXCreateIC = X11_GetSym("XCreateIC",&SDL_X11_HAVE_UTF8);
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169 #endif
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170
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171 if (!SDL_X11_HAVE_BASEXLIB) { /* some required symbol didn't load. */
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172 SDL_X11_UnloadSymbols(); /* in case something got loaded... */
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173 rc = 0;
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174 }
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175 }
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176 #else
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177 #ifdef X_HAVE_UTF8_STRING
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178 pXCreateIC = XCreateIC;
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179 #endif
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180 #endif
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181
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182 return rc;
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183 }
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184
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185 /* end of SDL_x11dyn.c ... */
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186