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annotate src/video/x11/SDL_x11dyn.c @ 3932:cd5b5c52a37e SDL-1.2

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Const correctness patch for SDL_MapRGB and SDL_MapRGBA. Fixes Bugzilla #421.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 04 Apr 2007 09:40:40 +0000
parents 9e85b267f8f3
children c121d94672cb b1d5b56aa549
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, void **fn)
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65 {
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66 int i;
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67 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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68 if (x11libs[i].lib != NULL)
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69 {
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70 *fn = SDL_LoadFunction(x11libs[i].lib, fnname);
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71 if (*fn != NULL)
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72 break;
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73 }
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74 }
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75
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76 #if DEBUG_DYNAMIC_X11
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77 if (*fn != NULL)
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78 printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, *fn);
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79 else
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80 printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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81 #endif
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82
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83 if (*fn == NULL)
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84 *rc = 0; /* kill this module. */
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85 }
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86
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87
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88 /* Define all the function pointers and wrappers... */
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89 #define SDL_X11_MODULE(modname)
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90 #define SDL_X11_SYM(rc,fn,params,args,ret) \
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91 static rc (*p##fn) params = NULL; \
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92 rc fn params { ret p##fn args ; }
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93 #include "SDL_x11sym.h"
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94 #undef SDL_X11_MODULE
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95 #undef SDL_X11_SYM
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96 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
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97
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98 /* Annoying varargs entry point... */
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99 #ifdef X_HAVE_UTF8_STRING
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100 XIC (*pXCreateIC)(XIM,...) = NULL;
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101 #endif
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102
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103 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
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104 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
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105 #define SDL_X11_SYM(rc,fn,params,args,ret)
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106 #include "SDL_x11sym.h"
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107 #undef SDL_X11_MODULE
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108 #undef SDL_X11_SYM
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109
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110
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111 static int x11_load_refcount = 0;
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112
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113 void SDL_X11_UnloadSymbols(void)
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114 {
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115 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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116 /* Don't actually unload if more than one module is using the libs... */
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117 if (x11_load_refcount > 0) {
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118 if (--x11_load_refcount == 0) {
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119 int i;
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120
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121 /* set all the function pointers to NULL. */
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122 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
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123 #define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
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124 #include "SDL_x11sym.h"
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125 #undef SDL_X11_MODULE
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126 #undef SDL_X11_SYM
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127
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128 #ifdef X_HAVE_UTF8_STRING
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129 pXCreateIC = NULL;
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130 #endif
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131
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132 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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133 if (x11libs[i].lib != NULL) {
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134 SDL_UnloadObject(x11libs[i].lib);
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135 x11libs[i].lib = NULL;
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136 }
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137 }
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138 }
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139 }
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140 #endif
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141 }
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142
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143 /* returns non-zero if all needed symbols were loaded. */
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144 int SDL_X11_LoadSymbols(void)
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145 {
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146 int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
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147
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148 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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149 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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150 if (x11_load_refcount++ == 0) {
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151 int i;
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152 int *thismod = NULL;
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153 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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154 if (x11libs[i].libname != NULL) {
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155 x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
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156 }
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157 }
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158 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
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159 #define SDL_X11_SYM(a,fn,x,y,z) X11_GetSym(#fn,thismod,(void**)&p##fn);
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160 #include "SDL_x11sym.h"
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161 #undef SDL_X11_MODULE
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162 #undef SDL_X11_SYM
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163
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164 #ifdef X_HAVE_UTF8_STRING
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165 X11_GetSym("XCreateIC",&SDL_X11_HAVE_UTF8,(void **)&pXCreateIC);
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166 #endif
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167
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168 if (!SDL_X11_HAVE_BASEXLIB) { /* some required symbol didn't load. */
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169 SDL_X11_UnloadSymbols(); /* in case something got loaded... */
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170 rc = 0;
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171 }
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172 }
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173 #else
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174 #if DEBUG_DYNAMIC_X11
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175 printf("X11: No dynamic X11 support in this build of SDL.\n");
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176 #endif
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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