annotate src/video/x11/SDL_x11image.c @ 1168:045f186426e1

Dynamically load X11 libraries like we currently do for alsa, esd, etc. This allows you to run an SDL program on a system without Xlib, since it'll just report the x11 target unavailable at runtime.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 05 Nov 2005 19:53:37 +0000
parents 26a0e2d69d39
children c9b51268668f
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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdlib.h>
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29 #include <unistd.h>
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30
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31 #include "SDL_error.h"
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32 #include "SDL_endian.h"
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33 #include "SDL_events_c.h"
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34 #include "SDL_x11image_c.h"
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35
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36 #ifndef NO_SHARED_MEMORY
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37
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38 /* Shared memory error handler routine */
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39 static int shm_error;
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40 static int (*X_handler)(Display *, XErrorEvent *) = NULL;
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41 static int shm_errhandler(Display *d, XErrorEvent *e)
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42 {
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43 if ( e->error_code == BadAccess ) {
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44 shm_error = True;
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45 return(0);
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46 } else
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47 return(X_handler(d,e));
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48 }
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49
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50 static void try_mitshm(_THIS, SDL_Surface *screen)
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51 {
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52 if(!use_mitshm)
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53 return;
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54 shminfo.shmid = shmget(IPC_PRIVATE, screen->h*screen->pitch,
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55 IPC_CREAT | 0777);
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56 if ( shminfo.shmid >= 0 ) {
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57 shminfo.shmaddr = (char *)shmat(shminfo.shmid, 0, 0);
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58 shminfo.readOnly = False;
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59 if ( shminfo.shmaddr != (char *)-1 ) {
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60 shm_error = False;
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61 X_handler = pXSetErrorHandler(shm_errhandler);
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62 pXShmAttach(SDL_Display, &shminfo);
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63 pXSync(SDL_Display, True);
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64 pXSetErrorHandler(X_handler);
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65 if ( shm_error )
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66 shmdt(shminfo.shmaddr);
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67 } else {
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68 shm_error = True;
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69 }
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70 shmctl(shminfo.shmid, IPC_RMID, NULL);
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71 } else {
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72 shm_error = True;
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73 }
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74 if ( shm_error )
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75 use_mitshm = 0;
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76 if ( use_mitshm )
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77 screen->pixels = shminfo.shmaddr;
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78 }
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79 #endif /* ! NO_SHARED_MEMORY */
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80
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81 /* Various screen update functions available */
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82 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects);
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83 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects);
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84
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85 int X11_SetupImage(_THIS, SDL_Surface *screen)
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86 {
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87 #ifndef NO_SHARED_MEMORY
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88 try_mitshm(this, screen);
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89 if(use_mitshm) {
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90 SDL_Ximage = pXShmCreateImage(SDL_Display, SDL_Visual,
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91 this->hidden->depth, ZPixmap,
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92 shminfo.shmaddr, &shminfo,
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93 screen->w, screen->h);
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94 if(!SDL_Ximage) {
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95 pXShmDetach(SDL_Display, &shminfo);
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96 pXSync(SDL_Display, False);
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97 shmdt(shminfo.shmaddr);
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98 screen->pixels = NULL;
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99 goto error;
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100 }
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101 this->UpdateRects = X11_MITSHMUpdate;
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102 }
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103 if(!use_mitshm)
270
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104 #endif /* not NO_SHARED_MEMORY */
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105 {
270
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106 int bpp;
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107 screen->pixels = malloc(screen->h*screen->pitch);
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108 if ( screen->pixels == NULL ) {
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109 SDL_OutOfMemory();
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110 return -1;
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111 }
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112 bpp = screen->format->BytesPerPixel;
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113 SDL_Ximage = pXCreateImage(SDL_Display, SDL_Visual,
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114 this->hidden->depth, ZPixmap, 0,
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115 (char *)screen->pixels,
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116 screen->w, screen->h,
270
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117 32, 0);
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118 if ( SDL_Ximage == NULL )
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119 goto error;
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120 /* XPutImage will convert byte sex automatically */
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121 SDL_Ximage->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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122 ? MSBFirst : LSBFirst;
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123 this->UpdateRects = X11_NormalUpdate;
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124 }
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125 screen->pitch = SDL_Ximage->bytes_per_line;
270
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126 return(0);
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127
270
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128 error:
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129 SDL_SetError("Couldn't create XImage");
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130 return 1;
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131 }
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132
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133 void X11_DestroyImage(_THIS, SDL_Surface *screen)
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134 {
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135 if ( SDL_Ximage ) {
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136 pXDestroyImage(SDL_Ximage);
0
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137 #ifndef NO_SHARED_MEMORY
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138 if ( use_mitshm ) {
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139 pXShmDetach(SDL_Display, &shminfo);
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140 pXSync(SDL_Display, False);
0
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141 shmdt(shminfo.shmaddr);
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142 }
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143 #endif /* ! NO_SHARED_MEMORY */
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144 SDL_Ximage = NULL;
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145 }
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146 if ( screen ) {
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147 screen->pixels = NULL;
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148 }
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149 }
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150
166
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151 /* Determine the number of CPUs in the system */
0
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152 static int num_CPU(void)
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153 {
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154 static int num_cpus = 0;
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155
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156 if(!num_cpus) {
166
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157 #if defined(__linux)
0
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158 char line[BUFSIZ];
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159 FILE *pstat = fopen("/proc/stat", "r");
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160 if ( pstat ) {
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161 while ( fgets(line, sizeof(line), pstat) ) {
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162 if (memcmp(line, "cpu", 3) == 0 && line[3] != ' ') {
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163 ++num_cpus;
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164 }
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165 }
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166 fclose(pstat);
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167 }
605
6399f4e90211 IRIX patches from Andrea Suatoni
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168 #elif defined(__sgi)
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169 num_cpus = sysconf(_SC_NPROC_ONLN);
166
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170 #elif defined(_SC_NPROCESSORS_ONLN)
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171 /* number of processors online (SVR4.0MP compliant machines) */
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172 num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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173 #elif defined(_SC_NPROCESSORS_CONF)
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174 /* number of processors configured (SVR4.0MP compliant machines) */
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175 num_cpus = sysconf(_SC_NPROCESSORS_CONF);
0
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176 #endif
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177 if ( num_cpus <= 0 ) {
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178 num_cpus = 1;
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179 }
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180 }
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181 return num_cpus;
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182 }
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183
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184 int X11_ResizeImage(_THIS, SDL_Surface *screen, Uint32 flags)
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185 {
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186 int retval;
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187
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188 X11_DestroyImage(this, screen);
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189 if ( flags & SDL_OPENGL ) { /* No image when using GL */
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190 retval = 0;
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191 } else {
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192 retval = X11_SetupImage(this, screen);
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193 /* We support asynchronous blitting on the display */
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194 if ( flags & SDL_ASYNCBLIT ) {
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195 /* This is actually slower on single-CPU systems,
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196 probably because of CPU contention between the
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197 X server and the application.
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198 Note: Is this still true with XFree86 4.0?
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199 */
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diff changeset
200 if ( num_CPU() > 1 ) {
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201 screen->flags |= SDL_ASYNCBLIT;
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202 }
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203 }
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204 }
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205 return(retval);
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206 }
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207
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208 /* We don't actually allow hardware surfaces other than the main one */
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209 int X11_AllocHWSurface(_THIS, SDL_Surface *surface)
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210 {
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211 return(-1);
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212 }
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213 void X11_FreeHWSurface(_THIS, SDL_Surface *surface)
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214 {
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215 return;
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parents:
diff changeset
216 }
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diff changeset
217
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218 int X11_LockHWSurface(_THIS, SDL_Surface *surface)
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219 {
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220 if ( (surface == SDL_VideoSurface) && blit_queued ) {
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221 pXSync(GFX_Display, False);
0
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222 blit_queued = 0;
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223 }
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224 return(0);
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225 }
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226 void X11_UnlockHWSurface(_THIS, SDL_Surface *surface)
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227 {
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228 return;
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229 }
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230
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231 int X11_FlipHWSurface(_THIS, SDL_Surface *surface)
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232 {
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233 return(0);
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234 }
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235
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236 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects)
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diff changeset
237 {
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238 int i;
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
239
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
Sam Lantinga <slouken@libsdl.org>
parents: 252
diff changeset
240 for (i = 0; i < numrects; ++i) {
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
Sam Lantinga <slouken@libsdl.org>
parents: 252
diff changeset
241 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
242 continue;
0
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243 }
1168
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diff changeset
244 pXPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
245 rects[i].x, rects[i].y,
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
246 rects[i].x, rects[i].y, rects[i].w, rects[i].h);
0
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247 }
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248 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) {
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249 pXFlush(GFX_Display);
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
250 blit_queued = 1;
0
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diff changeset
251 } else {
1168
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252 pXSync(GFX_Display, False);
0
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diff changeset
253 }
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diff changeset
254 }
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diff changeset
255
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diff changeset
256 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects)
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parents:
diff changeset
257 {
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parents:
diff changeset
258 #ifndef NO_SHARED_MEMORY
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parents:
diff changeset
259 int i;
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parents:
diff changeset
260
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diff changeset
261 for ( i=0; i<numrects; ++i ) {
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
Sam Lantinga <slouken@libsdl.org>
parents: 252
diff changeset
262 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */
0
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parents:
diff changeset
263 continue;
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diff changeset
264 }
1168
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diff changeset
265 pXShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
0
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266 rects[i].x, rects[i].y,
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diff changeset
267 rects[i].x, rects[i].y, rects[i].w, rects[i].h,
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268 False);
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diff changeset
269 }
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270 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) {
1168
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diff changeset
271 pXFlush(GFX_Display);
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
272 blit_queued = 1;
0
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diff changeset
273 } else {
1168
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274 pXSync(GFX_Display, False);
0
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diff changeset
275 }
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diff changeset
276 #endif /* ! NO_SHARED_MEMORY */
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parents:
diff changeset
277 }
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parents:
diff changeset
278
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diff changeset
279 /* There's a problem with the automatic refreshing of the display.
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parents:
diff changeset
280 Even though the XVideo code uses the GFX_Display to update the
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parents:
diff changeset
281 video memory, it appears that updating the window asynchronously
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parents:
diff changeset
282 from a different thread will cause "blackouts" of the window.
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parents:
diff changeset
283 This is a sort of a hacked workaround for the problem.
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parents:
diff changeset
284 */
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diff changeset
285 static int enable_autorefresh = 1;
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parents:
diff changeset
286
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parents:
diff changeset
287 void X11_DisableAutoRefresh(_THIS)
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parents:
diff changeset
288 {
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parents:
diff changeset
289 --enable_autorefresh;
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parents:
diff changeset
290 }
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diff changeset
291
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parents:
diff changeset
292 void X11_EnableAutoRefresh(_THIS)
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parents:
diff changeset
293 {
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parents:
diff changeset
294 ++enable_autorefresh;
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295 }
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296
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297 void X11_RefreshDisplay(_THIS)
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298 {
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299 /* Don't refresh a display that doesn't have an image (like GL)
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300 Instead, post an expose event so the application can refresh.
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301 */
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302 if ( ! SDL_Ximage || (enable_autorefresh <= 0) ) {
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303 SDL_PrivateExpose();
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304 return;
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305 }
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306 #ifndef NO_SHARED_MEMORY
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307 if ( this->UpdateRects == X11_MITSHMUpdate ) {
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308 pXShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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309 0, 0, 0, 0, this->screen->w, this->screen->h,
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310 False);
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311 } else
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312 #endif /* ! NO_SHARED_MEMORY */
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313 {
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314 pXPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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315 0, 0, 0, 0, this->screen->w, this->screen->h);
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316 }
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317 pXSync(SDL_Display, False);
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318 }