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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 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 <stdio.h> |
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25 #include <unistd.h> |
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26 |
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27 #include "SDL_endian.h" |
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28 #include "../../events/SDL_events_c.h" |
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29 #include "SDL_x11image_c.h" |
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30 |
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31 #ifndef NO_SHARED_MEMORY |
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32 |
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33 /* Shared memory error handler routine */ |
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34 static int shm_error; |
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35 static int (*X_handler)(Display *, XErrorEvent *) = NULL; |
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36 static int shm_errhandler(Display *d, XErrorEvent *e) |
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37 { |
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38 if ( e->error_code == BadAccess ) { |
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39 shm_error = True; |
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40 return(0); |
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41 } else |
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42 return(X_handler(d,e)); |
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43 } |
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44 |
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45 static void try_mitshm(_THIS, SDL_Surface *screen) |
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46 { |
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47 /* Dynamic X11 may not have SHM entry points on this box. */ |
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48 if ((use_mitshm) && (!SDL_X11_HAVE_SHM)) |
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49 use_mitshm = 0; |
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50 |
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51 if(!use_mitshm) |
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52 return; |
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53 shminfo.shmid = shmget(IPC_PRIVATE, screen->h*screen->pitch, |
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54 IPC_CREAT | 0777); |
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55 if ( shminfo.shmid >= 0 ) { |
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56 shminfo.shmaddr = (char *)shmat(shminfo.shmid, 0, 0); |
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57 shminfo.readOnly = False; |
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58 if ( shminfo.shmaddr != (char *)-1 ) { |
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59 shm_error = False; |
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60 X_handler = XSetErrorHandler(shm_errhandler); |
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61 XShmAttach(SDL_Display, &shminfo); |
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62 XSync(SDL_Display, True); |
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63 XSetErrorHandler(X_handler); |
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64 if ( shm_error ) |
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65 shmdt(shminfo.shmaddr); |
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66 } else { |
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67 shm_error = True; |
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68 } |
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69 shmctl(shminfo.shmid, IPC_RMID, NULL); |
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70 } else { |
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71 shm_error = True; |
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72 } |
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73 if ( shm_error ) |
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74 use_mitshm = 0; |
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75 if ( use_mitshm ) |
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76 screen->pixels = shminfo.shmaddr; |
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77 } |
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78 #endif /* ! NO_SHARED_MEMORY */ |
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79 |
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80 /* Various screen update functions available */ |
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81 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects); |
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82 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects); |
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83 |
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84 int X11_SetupImage(_THIS, SDL_Surface *screen) |
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85 { |
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86 #ifndef NO_SHARED_MEMORY |
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87 try_mitshm(this, screen); |
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88 if(use_mitshm) { |
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89 SDL_Ximage = XShmCreateImage(SDL_Display, SDL_Visual, |
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90 this->hidden->depth, ZPixmap, |
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91 shminfo.shmaddr, &shminfo, |
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92 screen->w, screen->h); |
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93 if(!SDL_Ximage) { |
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94 XShmDetach(SDL_Display, &shminfo); |
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95 XSync(SDL_Display, False); |
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96 shmdt(shminfo.shmaddr); |
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97 screen->pixels = NULL; |
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98 goto error; |
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99 } |
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100 this->UpdateRects = X11_MITSHMUpdate; |
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101 } |
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102 if(!use_mitshm) |
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103 #endif /* not NO_SHARED_MEMORY */ |
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104 { |
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105 int bpp; |
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106 screen->pixels = SDL_malloc(screen->h*screen->pitch); |
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107 if ( screen->pixels == NULL ) { |
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108 SDL_OutOfMemory(); |
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109 return -1; |
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110 } |
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111 bpp = screen->format->BytesPerPixel; |
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112 SDL_Ximage = XCreateImage(SDL_Display, SDL_Visual, |
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113 this->hidden->depth, ZPixmap, 0, |
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114 (char *)screen->pixels, |
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115 screen->w, screen->h, |
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116 32, 0); |
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117 if ( SDL_Ximage == NULL ) |
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118 goto error; |
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119 /* XPutImage will convert byte sex automatically */ |
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120 SDL_Ximage->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN) |
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121 ? MSBFirst : LSBFirst; |
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122 this->UpdateRects = X11_NormalUpdate; |
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123 } |
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124 screen->pitch = SDL_Ximage->bytes_per_line; |
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125 return(0); |
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126 |
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127 error: |
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128 SDL_SetError("Couldn't create XImage"); |
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129 return 1; |
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130 } |
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131 |
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132 void X11_DestroyImage(_THIS, SDL_Surface *screen) |
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133 { |
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134 if ( SDL_Ximage ) { |
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135 XDestroyImage(SDL_Ximage); |
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136 #ifndef NO_SHARED_MEMORY |
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137 if ( use_mitshm ) { |
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138 XShmDetach(SDL_Display, &shminfo); |
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139 XSync(SDL_Display, False); |
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140 shmdt(shminfo.shmaddr); |
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141 } |
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142 #endif /* ! NO_SHARED_MEMORY */ |
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143 SDL_Ximage = NULL; |
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144 } |
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145 if ( screen ) { |
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146 screen->pixels = NULL; |
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147 } |
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148 } |
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149 |
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150 /* Determine the number of CPUs in the system */ |
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151 static int num_CPU(void) |
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152 { |
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153 static int num_cpus = 0; |
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154 |
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155 if(!num_cpus) { |
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156 #if defined(__LINUX__) |
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157 char line[BUFSIZ]; |
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158 FILE *pstat = fopen("/proc/stat", "r"); |
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159 if ( pstat ) { |
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160 while ( fgets(line, sizeof(line), pstat) ) { |
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161 if (SDL_memcmp(line, "cpu", 3) == 0 && line[3] != ' ') { |
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162 ++num_cpus; |
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163 } |
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164 } |
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165 fclose(pstat); |
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166 } |
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167 #elif defined(__IRIX__) |
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168 num_cpus = sysconf(_SC_NPROC_ONLN); |
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169 #elif defined(_SC_NPROCESSORS_ONLN) |
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170 /* number of processors online (SVR4.0MP compliant machines) */ |
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171 num_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
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172 #elif defined(_SC_NPROCESSORS_CONF) |
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173 /* number of processors configured (SVR4.0MP compliant machines) */ |
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174 num_cpus = sysconf(_SC_NPROCESSORS_CONF); |
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175 #endif |
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176 if ( num_cpus <= 0 ) { |
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177 num_cpus = 1; |
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178 } |
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179 } |
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180 return num_cpus; |
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181 } |
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182 |
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183 int X11_ResizeImage(_THIS, SDL_Surface *screen, Uint32 flags) |
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184 { |
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185 int retval; |
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186 |
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187 X11_DestroyImage(this, screen); |
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188 if ( flags & SDL_OPENGL ) { /* No image when using GL */ |
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189 retval = 0; |
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190 } else { |
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191 retval = X11_SetupImage(this, screen); |
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192 /* We support asynchronous blitting on the display */ |
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193 if ( flags & SDL_ASYNCBLIT ) { |
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194 /* This is actually slower on single-CPU systems, |
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195 probably because of CPU contention between the |
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196 X server and the application. |
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197 Note: Is this still true with XFree86 4.0? |
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198 */ |
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199 if ( num_CPU() > 1 ) { |
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200 screen->flags |= SDL_ASYNCBLIT; |
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201 } |
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202 } |
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203 } |
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204 return(retval); |
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205 } |
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206 |
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207 /* We don't actually allow hardware surfaces other than the main one */ |
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208 int X11_AllocHWSurface(_THIS, SDL_Surface *surface) |
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209 { |
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210 return(-1); |
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211 } |
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212 void X11_FreeHWSurface(_THIS, SDL_Surface *surface) |
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213 { |
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214 return; |
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215 } |
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216 |
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217 int X11_LockHWSurface(_THIS, SDL_Surface *surface) |
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218 { |
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219 if ( (surface == SDL_VideoSurface) && blit_queued ) { |
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220 XSync(GFX_Display, False); |
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221 blit_queued = 0; |
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222 } |
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223 return(0); |
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224 } |
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225 void X11_UnlockHWSurface(_THIS, SDL_Surface *surface) |
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226 { |
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227 return; |
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228 } |
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229 |
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230 int X11_FlipHWSurface(_THIS, SDL_Surface *surface) |
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231 { |
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232 return(0); |
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233 } |
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234 |
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235 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects) |
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236 { |
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237 int i; |
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238 |
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239 for (i = 0; i < numrects; ++i) { |
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240 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */ |
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241 continue; |
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242 } |
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243 XPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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244 rects[i].x, rects[i].y, |
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245 rects[i].x, rects[i].y, rects[i].w, rects[i].h); |
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246 } |
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247 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) { |
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248 XFlush(GFX_Display); |
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249 blit_queued = 1; |
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250 } else { |
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251 XSync(GFX_Display, False); |
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252 } |
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253 } |
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254 |
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255 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects) |
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256 { |
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257 #ifndef NO_SHARED_MEMORY |
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258 int i; |
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259 |
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260 for ( i=0; i<numrects; ++i ) { |
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261 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */ |
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262 continue; |
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263 } |
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264 XShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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265 rects[i].x, rects[i].y, |
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266 rects[i].x, rects[i].y, rects[i].w, rects[i].h, |
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267 False); |
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268 } |
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269 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) { |
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270 XFlush(GFX_Display); |
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271 blit_queued = 1; |
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272 } else { |
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273 XSync(GFX_Display, False); |
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274 } |
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275 #endif /* ! NO_SHARED_MEMORY */ |
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276 } |
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277 |
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278 /* There's a problem with the automatic refreshing of the display. |
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279 Even though the XVideo code uses the GFX_Display to update the |
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280 video memory, it appears that updating the window asynchronously |
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281 from a different thread will cause "blackouts" of the window. |
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282 This is a sort of a hacked workaround for the problem. |
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283 */ |
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284 static int enable_autorefresh = 1; |
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285 |
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286 void X11_DisableAutoRefresh(_THIS) |
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287 { |
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288 --enable_autorefresh; |
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289 } |
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290 |
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291 void X11_EnableAutoRefresh(_THIS) |
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292 { |
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293 ++enable_autorefresh; |
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294 } |
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295 |
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296 void X11_RefreshDisplay(_THIS) |
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297 { |
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298 /* Don't refresh a display that doesn't have an image (like GL) |
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299 Instead, post an expose event so the application can refresh. |
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300 */ |
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301 if ( ! SDL_Ximage || (enable_autorefresh <= 0) ) { |
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302 SDL_PrivateExpose(); |
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303 return; |
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304 } |
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305 #ifndef NO_SHARED_MEMORY |
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306 if ( this->UpdateRects == X11_MITSHMUpdate ) { |
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307 XShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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308 0, 0, 0, 0, this->screen->w, this->screen->h, |
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309 False); |
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310 } else |
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311 #endif /* ! NO_SHARED_MEMORY */ |
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312 { |
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313 XPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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314 0, 0, 0, 0, this->screen->w, this->screen->h); |
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315 } |
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316 XSync(SDL_Display, False); |
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317 } |
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318 |