Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11framebuffer.c @ 5284:96a22141cf86 tip
Changed output directory of Universal libSDL.a for iOS to respect build configurations. Template generator was updated to reflect these changes as well.
author | Eric Wing <ewing . public |-at-| gmail . com> |
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date | Sat, 12 Feb 2011 21:52:30 -0800 |
parents | b530ef003506 |
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rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
5267 | 3 Copyright (C) 1997-2011 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_x11video.h" |
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25 #include "SDL_x11framebuffer.h" |
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26 |
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27 |
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28 #ifndef NO_SHARED_MEMORY |
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29 |
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30 /* Shared memory error handler routine */ |
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31 static int shm_error; |
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32 static int (*X_handler)(Display *, XErrorEvent *) = NULL; |
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33 static int shm_errhandler(Display *d, XErrorEvent *e) |
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34 { |
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35 if ( e->error_code == BadAccess ) { |
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36 shm_error = True; |
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37 return(0); |
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38 } else |
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39 return(X_handler(d,e)); |
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40 } |
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41 |
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42 static SDL_bool have_mitshm(void) |
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43 { |
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44 /* Only use shared memory on local X servers */ |
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45 if ( (SDL_strncmp(XDisplayName(NULL), ":", 1) == 0) || |
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46 (SDL_strncmp(XDisplayName(NULL), "unix:", 5) == 0) ) { |
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47 return SDL_X11_HAVE_SHM; |
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48 } |
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49 return SDL_FALSE; |
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50 } |
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51 |
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52 #endif /* !NO_SHARED_MEMORY */ |
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53 |
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54 int |
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55 X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, |
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56 void ** pixels, int *pitch) |
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57 { |
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58 SDL_WindowData *data = (SDL_WindowData *) window->driverdata; |
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59 Display *display = data->videodata->display; |
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60 XGCValues gcv; |
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61 XVisualInfo vinfo; |
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62 |
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63 /* Free the old framebuffer surface */ |
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64 X11_DestroyWindowFramebuffer(_this, window); |
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65 |
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66 /* Create the graphics context for drawing */ |
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67 gcv.graphics_exposures = False; |
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68 data->gc = XCreateGC(display, data->xwindow, GCGraphicsExposures, &gcv); |
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69 if (!data->gc) { |
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70 SDL_SetError("Couldn't create graphics context"); |
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71 return -1; |
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72 } |
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73 |
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74 /* Find out the pixel format and depth */ |
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75 if (X11_GetVisualInfoFromVisual(display, data->visual, &vinfo) < 0) { |
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76 SDL_SetError("Couldn't get window visual information"); |
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77 return -1; |
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78 } |
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79 |
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80 *format = X11_GetPixelFormatFromVisualInfo(display, &vinfo); |
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81 if (*format == SDL_PIXELFORMAT_UNKNOWN) { |
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82 SDL_SetError("Unknown window pixel format"); |
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83 return -1; |
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84 } |
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85 |
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86 /* Calculate pitch */ |
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87 *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3); |
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88 |
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89 /* Create the actual image */ |
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90 #ifndef NO_SHARED_MEMORY |
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91 if (have_mitshm()) { |
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92 XShmSegmentInfo *shminfo = &data->shminfo; |
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93 |
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94 shminfo->shmid = shmget(IPC_PRIVATE, window->h*(*pitch), IPC_CREAT | 0777); |
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95 if ( shminfo->shmid >= 0 ) { |
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96 shminfo->shmaddr = (char *)shmat(shminfo->shmid, 0, 0); |
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97 shminfo->readOnly = False; |
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98 if ( shminfo->shmaddr != (char *)-1 ) { |
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99 shm_error = False; |
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100 X_handler = XSetErrorHandler(shm_errhandler); |
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101 XShmAttach(display, shminfo); |
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102 XSync(display, True); |
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103 XSetErrorHandler(X_handler); |
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104 if ( shm_error ) |
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105 shmdt(shminfo->shmaddr); |
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106 } else { |
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107 shm_error = True; |
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108 } |
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109 shmctl(shminfo->shmid, IPC_RMID, NULL); |
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110 } else { |
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111 shm_error = True; |
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112 } |
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113 if (!shm_error) { |
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114 data->ximage = XShmCreateImage(display, data->visual, |
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115 vinfo.depth, ZPixmap, |
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116 shminfo->shmaddr, shminfo, |
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117 window->w, window->h); |
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118 if (!data->ximage) { |
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119 XShmDetach(display, shminfo); |
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120 XSync(display, False); |
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121 shmdt(shminfo->shmaddr); |
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122 } else { |
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123 /* Done! */ |
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124 data->use_mitshm = SDL_TRUE; |
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125 *pixels = shminfo->shmaddr; |
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126 return 0; |
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127 } |
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128 } |
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129 } |
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130 #endif /* not NO_SHARED_MEMORY */ |
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131 |
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132 *pixels = SDL_malloc(window->h*(*pitch)); |
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133 if (*pixels == NULL) { |
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134 SDL_OutOfMemory(); |
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135 return -1; |
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136 } |
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137 |
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138 data->ximage = XCreateImage(display, data->visual, |
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139 vinfo.depth, ZPixmap, 0, (char *)(*pixels), |
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140 window->w, window->h, 32, 0); |
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141 if (!data->ximage) { |
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142 SDL_free(*pixels); |
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143 SDL_SetError("Couldn't create XImage"); |
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144 return -1; |
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145 } |
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146 return 0; |
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147 } |
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148 |
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149 int |
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150 X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window, |
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151 int numrects, SDL_Rect * rects) |
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152 { |
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153 SDL_WindowData *data = (SDL_WindowData *) window->driverdata; |
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154 Display *display = data->videodata->display; |
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155 int i; |
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156 SDL_Rect *rect; |
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157 |
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158 #ifndef NO_SHARED_MEMORY |
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159 if (data->use_mitshm) { |
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160 for (i = 0; i < numrects; ++i) { |
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161 rect = &rects[i]; |
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162 |
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163 if (rect->w == 0 || rect->h == 0) { /* Clipped? */ |
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164 continue; |
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165 } |
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166 XShmPutImage(display, data->xwindow, data->gc, data->ximage, |
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167 rect->x, rect->y, |
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168 rect->x, rect->y, rect->w, rect->h, False); |
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169 } |
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170 } |
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171 else |
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172 #endif /* !NO_SHARED_MEMORY */ |
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173 { |
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174 for (i = 0; i < numrects; ++i) { |
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175 rect = &rects[i]; |
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176 |
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177 if (rect->w == 0 || rect->h == 0) { /* Clipped? */ |
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178 continue; |
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179 } |
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180 XPutImage(display, data->xwindow, data->gc, data->ximage, |
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181 rect->x, rect->y, |
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182 rect->x, rect->y, rect->w, rect->h); |
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183 } |
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184 } |
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185 XSync(display, False); |
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186 } |
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187 |
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188 void |
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189 X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window) |
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190 { |
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191 SDL_WindowData *data = (SDL_WindowData *) window->driverdata; |
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192 Display *display = data->videodata->display; |
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193 |
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194 if (data->ximage) { |
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195 XDestroyImage(data->ximage); |
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196 |
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197 #ifndef NO_SHARED_MEMORY |
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198 if (data->use_mitshm) { |
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199 XShmDetach(display, &data->shminfo); |
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200 XSync(display, False); |
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201 shmdt(data->shminfo.shmaddr); |
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202 data->use_mitshm = SDL_FALSE; |
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203 } |
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204 #endif /* !NO_SHARED_MEMORY */ |
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205 |
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206 data->ximage = NULL; |
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207 } |
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208 if (data->gc) { |
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209 XFreeGC(display, data->gc); |
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210 data->gc = NULL; |
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211 } |
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212 } |
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213 |
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214 /* vi: set ts=4 sw=4 expandtab: */ |