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0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com
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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
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30 #include "SDL_error.h"
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31 #include "SDL_endian.h"
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32 #include "SDL_x11image_c.h"
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33
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34 #if defined(__USLC__)
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35 #ifdef HAVE_KSTAT
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36 #undef HAVE_KSTAT
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37 #endif
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38 #include <unistd.h>
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39 #endif
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40
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41 #ifdef HAVE_KSTAT
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42 #include <kstat.h>
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43 #endif
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44
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45 #ifndef NO_SHARED_MEMORY
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46
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47 /* Shared memory information */
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48 extern int XShmQueryExtension(Display *dpy); /* Not in X11 headers */
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49
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50 /* Shared memory error handler routine */
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51 static int shm_error;
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52 static int (*X_handler)(Display *, XErrorEvent *) = NULL;
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53 static int shm_errhandler(Display *d, XErrorEvent *e)
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54 {
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55 if ( e->error_code == BadAccess ) {
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56 ++shm_error;
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57 return(0);
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58 } else
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59 return(X_handler(d,e));
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60 }
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61 #endif /* ! NO_SHARED_MEMORY */
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62
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63 /* Various screen update functions available */
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64 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects);
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65 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects);
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66
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67 int X11_SetupImage(_THIS, SDL_Surface *screen)
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68 {
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69 #ifdef NO_SHARED_MEMORY
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70 screen->pixels = malloc(screen->h*screen->pitch);
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71 #else
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72 /* Allocate shared memory if possible */
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73 if ( use_mitshm ) {
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74 shminfo.shmid = shmget(IPC_PRIVATE, screen->h*screen->pitch,
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75 IPC_CREAT|0777);
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76 if ( shminfo.shmid >= 0 ) {
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77 shminfo.shmaddr = (char *)shmat(shminfo.shmid, 0, 0);
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78 shminfo.readOnly = False;
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79 if ( shminfo.shmaddr != (char *)-1 ) {
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80 shm_error = False;
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81 X_handler = XSetErrorHandler(shm_errhandler);
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82 XShmAttach(SDL_Display, &shminfo);
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83 XSync(SDL_Display, True);
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84 XSetErrorHandler(X_handler);
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85 if ( shm_error == True )
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86 shmdt(shminfo.shmaddr);
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87 } else {
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88 shm_error = True;
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89 }
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90 shmctl(shminfo.shmid, IPC_RMID, NULL);
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91 } else {
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92 shm_error = True;
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93 }
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94 if ( shm_error == True )
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95 use_mitshm = 0;
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96 }
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97 if ( use_mitshm ) {
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98 screen->pixels = shminfo.shmaddr;
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99 } else {
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100 screen->pixels = malloc(screen->h*screen->pitch);
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101 }
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102 #endif /* NO_SHARED_MEMORY */
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103 if ( screen->pixels == NULL ) {
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104 SDL_OutOfMemory();
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105 return(-1);
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106 }
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107
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108 #ifdef NO_SHARED_MEMORY
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109 {
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110 int bpp = screen->format->BytesPerPixel;
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111 SDL_Ximage = XCreateImage(SDL_Display, SDL_Visual,
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112 this->hidden->depth, ZPixmap, 0,
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113 (char *)screen->pixels,
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114 screen->w, screen->h,
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115 (bpp == 3) ? 32 : bpp * 8,
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116 0);
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117 }
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118 #else
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119 if ( use_mitshm ) {
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120 SDL_Ximage = XShmCreateImage(SDL_Display, SDL_Visual,
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121 this->hidden->depth, ZPixmap,
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122 shminfo.shmaddr, &shminfo,
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123 screen->w, screen->h);
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124 } else {
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125 int bpp = screen->format->BytesPerPixel;
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126 SDL_Ximage = XCreateImage(SDL_Display, SDL_Visual,
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127 this->hidden->depth, ZPixmap, 0,
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128 (char *)screen->pixels,
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129 screen->w, screen->h,
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130 (bpp == 3) ? 32 : bpp * 8,
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131 0);
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132 }
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133 #endif /* NO_SHARED_MEMORY */
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134 if ( SDL_Ximage == NULL ) {
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135 SDL_SetError("Couldn't create 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 screen->pixels = NULL;
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142 }
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143 #endif /* ! NO_SHARED_MEMORY */
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144 return(-1);
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145 }
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146 screen->pitch = SDL_Ximage->bytes_per_line;
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147
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148 /* Determine what blit function to use */
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149 #ifdef NO_SHARED_MEMORY
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150 this->UpdateRects = X11_NormalUpdate;
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151 #else
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152 if ( use_mitshm ) {
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153 this->UpdateRects = X11_MITSHMUpdate;
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154 } else {
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155 this->UpdateRects = X11_NormalUpdate;
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156 }
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157 #endif
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158 return(0);
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159 }
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160
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161 void X11_DestroyImage(_THIS, SDL_Surface *screen)
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162 {
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163 if ( SDL_Ximage ) {
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164 XDestroyImage(SDL_Ximage);
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165 #ifndef NO_SHARED_MEMORY
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166 if ( use_mitshm ) {
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167 XShmDetach(SDL_Display, &shminfo);
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168 XSync(SDL_Display, False);
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169 shmdt(shminfo.shmaddr);
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170 }
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171 #endif /* ! NO_SHARED_MEMORY */
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172 SDL_Ximage = NULL;
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173 }
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174 if ( screen ) {
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175 screen->pixels = NULL;
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176 }
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177 }
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178
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179 /* This is a hack to see whether this system has more than 1 CPU */
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180 static int num_CPU(void)
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181 {
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182 static int num_cpus = 0;
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183
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184 if(!num_cpus) {
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185 #ifdef linux
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186 char line[BUFSIZ];
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187 FILE *pstat = fopen("/proc/stat", "r");
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188 if ( pstat ) {
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189 while ( fgets(line, sizeof(line), pstat) ) {
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190 if (memcmp(line, "cpu", 3) == 0 && line[3] != ' ') {
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191 ++num_cpus;
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192 }
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193 }
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194 fclose(pstat);
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195 }
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196 #elif defined(HAVE_KSTAT)
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197 kstat_ctl_t *kc = kstat_open();
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198 kstat_t *ks;
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199 kstat_named_t *kn;
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200 if(kc) {
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201 if((ks = kstat_lookup(kc, "unix", -1, "system_misc"))
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202 && kstat_read(kc, ks, NULL) != -1
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203 && (kn = kstat_data_lookup(ks, "ncpus")))
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204 #ifdef KSTAT_DATA_UINT32
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205 num_cpus = kn->value.ui32;
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206 #else
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207 num_cpus = kn->value.ul; /* needed in solaris <2.6 */
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208 #endif
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209 kstat_close(kc);
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210 }
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211 #elif defined(__USLC__)
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212 num_cpus = (int)sysconf(_SC_NPROCESSORS_CONF);
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213 #endif
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214 if ( num_cpus <= 0 ) {
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215 num_cpus = 1;
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216 }
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217 }
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218 return num_cpus;
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219 }
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220
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221 int X11_ResizeImage(_THIS, SDL_Surface *screen, Uint32 flags)
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222 {
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223 int retval;
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224
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225 X11_DestroyImage(this, screen);
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226 if ( flags & SDL_OPENGL ) { /* No image when using GL */
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227 retval = 0;
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228 } else {
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229 retval = X11_SetupImage(this, screen);
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230 /* We support asynchronous blitting on the display */
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231 if ( flags & SDL_ASYNCBLIT ) {
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232 /* This is actually slower on single-CPU systems,
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233 probably because of CPU contention between the
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234 X server and the application.
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235 Note: Is this still true with XFree86 4.0?
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236 */
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237 if ( num_CPU() > 1 ) {
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238 screen->flags |= SDL_ASYNCBLIT;
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239 }
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240 }
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241 }
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242 return(retval);
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243 }
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244
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245 /* We don't actually allow hardware surfaces other than the main one */
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246 int X11_AllocHWSurface(_THIS, SDL_Surface *surface)
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247 {
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248 return(-1);
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249 }
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250 void X11_FreeHWSurface(_THIS, SDL_Surface *surface)
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251 {
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252 return;
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253 }
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254
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255 int X11_LockHWSurface(_THIS, SDL_Surface *surface)
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256 {
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257 if ( (surface == SDL_VideoSurface) && blit_queued ) {
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258 XSync(GFX_Display, False);
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259 blit_queued = 0;
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260 }
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261 return(0);
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262 }
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263 void X11_UnlockHWSurface(_THIS, SDL_Surface *surface)
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264 {
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265 return;
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266 }
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267
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268 int X11_FlipHWSurface(_THIS, SDL_Surface *surface)
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269 {
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270 return(0);
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271 }
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272
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273 /* Byte-swap the pixels in the display image */
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274 static void X11_SwapAllPixels(SDL_Surface *screen)
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275 {
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276 int x, y;
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277
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278 switch (screen->format->BytesPerPixel) {
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279 case 2: {
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280 Uint16 *spot;
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281 for ( y=0; y<screen->h; ++y ) {
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282 spot = (Uint16 *) ((Uint8 *)screen->pixels +
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283 y * screen->pitch);
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284 for ( x=0; x<screen->w; ++x, ++spot ) {
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285 *spot = SDL_Swap16(*spot);
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286 }
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287 }
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288 }
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289 break;
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290
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291 case 4: {
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292 Uint32 *spot;
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293 for ( y=0; y<screen->h; ++y ) {
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294 spot = (Uint32 *) ((Uint8 *)screen->pixels +
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295 y * screen->pitch);
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296 for ( x=0; x<screen->w; ++x, ++spot ) {
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297 *spot = SDL_Swap32(*spot);
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298 }
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299 }
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300 }
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301 break;
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302
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303 default:
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304 /* should never get here */
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305 break;
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306 }
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307 }
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308 static void X11_SwapPixels(SDL_Surface *screen, SDL_Rect *rect)
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309 {
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310 int x, minx, maxx;
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311 int y, miny, maxy;
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312
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313 switch (screen->format->BytesPerPixel) {
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314 case 2: {
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315 Uint16 *spot;
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316 minx = rect->x;
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317 maxx = rect->x + rect->w;
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318 miny = rect->y;
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319 maxy = rect->y + rect->h;
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320 for ( y=miny; y<maxy; ++y ) {
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321 spot = (Uint16 *) ((Uint8 *)screen->pixels +
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322 y * screen->pitch + minx * 2);
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323 for ( x=minx; x<maxx; ++x, ++spot ) {
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324 *spot = SDL_Swap16(*spot);
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325 }
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326 }
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327 }
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328 break;
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329
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330 case 4: {
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331 Uint32 *spot;
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332 minx = rect->x;
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333 maxx = rect->x + rect->w;
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334 miny = rect->y;
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335 maxy = rect->y + rect->h;
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336 for ( y=miny; y<maxy; ++y ) {
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337 spot = (Uint32 *) ((Uint8 *)screen->pixels +
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338 y * screen->pitch + minx * 4);
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339 for ( x=minx; x<maxx; ++x, ++spot ) {
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340 *spot = SDL_Swap32(*spot);
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341 }
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342 }
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343 }
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344 break;
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345
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346 default:
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347 /* should never get here */
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348 break;
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349 }
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350 }
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351
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352 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects)
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353 {
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354 int i;
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355
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356 /* Check for endian-swapped X server, swap if necessary (VERY slow!) */
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357 if ( swap_pixels &&
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358 ((this->screen->format->BytesPerPixel%2) == 0) ) {
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359 for ( i=0; i<numrects; ++i ) {
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360 if ( ! rects[i].w ) { /* Clipped? */
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361 continue;
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362 }
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363 X11_SwapPixels(this->screen, rects + i);
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364 XPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
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365 rects[i].x, rects[i].y,
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366 rects[i].x, rects[i].y, rects[i].w, rects[i].h);
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367 X11_SwapPixels(this->screen, rects + i);
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368 }
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369 } else {
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370 for ( i=0; i<numrects; ++i ) {
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371 if ( ! rects[i].w ) { /* Clipped? */
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372 continue;
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373 }
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374 XPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
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375 rects[i].x, rects[i].y,
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376 rects[i].x, rects[i].y, rects[i].w, rects[i].h);
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377 }
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378 }
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379 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) {
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380 XFlush(GFX_Display);
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381 ++blit_queued;
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382 } else {
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383 XSync(GFX_Display, False);
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384 }
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385 }
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386
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387 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects)
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388 {
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389 #ifndef NO_SHARED_MEMORY
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390 int i;
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391
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392 for ( i=0; i<numrects; ++i ) {
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393 if ( ! rects[i].w ) { /* Clipped? */
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394 continue;
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395 }
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396 XShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
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397 rects[i].x, rects[i].y,
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398 rects[i].x, rects[i].y, rects[i].w, rects[i].h,
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399 False);
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400 }
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401 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) {
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402 XFlush(GFX_Display);
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403 ++blit_queued;
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404 } else {
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405 XSync(GFX_Display, False);
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406 }
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407 #endif /* ! NO_SHARED_MEMORY */
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408 }
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409
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410 /* There's a problem with the automatic refreshing of the display.
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411 Even though the XVideo code uses the GFX_Display to update the
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412 video memory, it appears that updating the window asynchronously
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413 from a different thread will cause "blackouts" of the window.
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414 This is a sort of a hacked workaround for the problem.
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415 */
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416 static int enable_autorefresh = 1;
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417
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418 void X11_DisableAutoRefresh(_THIS)
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419 {
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420 --enable_autorefresh;
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421 }
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422
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423 void X11_EnableAutoRefresh(_THIS)
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424 {
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425 ++enable_autorefresh;
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426 }
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427
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428 void X11_RefreshDisplay(_THIS)
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429 {
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430 /* Don't refresh a display that doesn't have an image (like GL) */
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431 if ( ! SDL_Ximage || (enable_autorefresh <= 0) ) {
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432 return;
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433 }
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434 #ifndef NO_SHARED_MEMORY
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435 if ( this->UpdateRects == X11_MITSHMUpdate ) {
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436 XShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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437 0, 0, 0, 0, this->screen->w, this->screen->h,
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438 False);
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439 } else {
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440 #else
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441 {
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442 #endif /* ! NO_SHARED_MEMORY */
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443 /* Check for endian-swapped X server, swap if necessary */
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444 if ( swap_pixels &&
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445 ((this->screen->format->BytesPerPixel%2) == 0) ) {
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446 X11_SwapAllPixels(this->screen);
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447 XPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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448 0, 0, 0, 0, this->screen->w, this->screen->h);
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449 X11_SwapAllPixels(this->screen);
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450 } else {
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451 XPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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452 0, 0, 0, 0, this->screen->w, this->screen->h);
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453 }
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454 }
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455 XSync(SDL_Display, False);
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456 }
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