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annotate src/video/x11/SDL_x11image.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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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
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37 shm_errhandler(Display * d, XErrorEvent * e)
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38 {
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39 if (e->error_code == BadAccess) {
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40 shm_error = True;
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41 return (0);
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42 } else
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43 return (X_handler(d, e));
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44 }
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45
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46 static void
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47 try_mitshm(_THIS, SDL_Surface * screen)
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48 {
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49 /* Dynamic X11 may not have SHM entry points on this box. */
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50 if ((use_mitshm) && (!SDL_X11_HAVE_SHM))
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51 use_mitshm = 0;
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52
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53 if (!use_mitshm)
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54 return;
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55 shminfo.shmid = shmget(IPC_PRIVATE, screen->h * screen->pitch,
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56 IPC_CREAT | 0777);
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57 if (shminfo.shmid >= 0) {
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58 shminfo.shmaddr = (char *) shmat(shminfo.shmid, 0, 0);
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59 shminfo.readOnly = False;
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60 if (shminfo.shmaddr != (char *) -1) {
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61 shm_error = False;
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62 X_handler = XSetErrorHandler(shm_errhandler);
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63 XShmAttach(SDL_Display, &shminfo);
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64 XSync(SDL_Display, True);
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65 XSetErrorHandler(X_handler);
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66 if (shm_error)
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67 shmdt(shminfo.shmaddr);
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68 } else {
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69 shm_error = True;
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70 }
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71 shmctl(shminfo.shmid, IPC_RMID, NULL);
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72 } else {
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73 shm_error = True;
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74 }
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75 if (shm_error)
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76 use_mitshm = 0;
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77 if (use_mitshm)
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78 screen->pixels = shminfo.shmaddr;
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79 }
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80 #endif /* ! NO_SHARED_MEMORY */
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81
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82 /* Various screen update functions available */
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83 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect * rects);
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84 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect * rects);
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85
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86 int
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87 X11_SetupImage(_THIS, SDL_Surface * screen)
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88 {
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89 #ifndef NO_SHARED_MEMORY
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90 try_mitshm(this, screen);
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91 if (use_mitshm) {
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92 SDL_Ximage = XShmCreateImage(SDL_Display, SDL_Visual,
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93 this->hidden->depth, ZPixmap,
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94 shminfo.shmaddr, &shminfo,
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95 screen->w, screen->h);
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96 if (!SDL_Ximage) {
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97 XShmDetach(SDL_Display, &shminfo);
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98 XSync(SDL_Display, False);
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99 shmdt(shminfo.shmaddr);
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100 screen->pixels = NULL;
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101 goto error;
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102 }
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103 this->UpdateRects = X11_MITSHMUpdate;
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104 }
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105 if (!use_mitshm)
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106 #endif /* not NO_SHARED_MEMORY */
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107 {
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108 int bpp;
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109 screen->pixels = SDL_malloc(screen->h * screen->pitch);
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110 if (screen->pixels == NULL) {
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111 SDL_OutOfMemory();
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112 return -1;
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113 }
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114 bpp = screen->format->BytesPerPixel;
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115 SDL_Ximage = XCreateImage(SDL_Display, SDL_Visual,
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116 this->hidden->depth, ZPixmap, 0,
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117 (char *) screen->pixels,
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118 screen->w, screen->h, 32, 0);
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119 if (SDL_Ximage == NULL)
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120 goto error;
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121 /* XPutImage will convert byte sex automatically */
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122 SDL_Ximage->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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123 ? MSBFirst : LSBFirst;
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124 this->UpdateRects = X11_NormalUpdate;
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125 }
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126 screen->pitch = SDL_Ximage->bytes_per_line;
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127 return (0);
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128
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129 error:
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130 SDL_SetError("Couldn't create XImage");
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131 return 1;
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132 }
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133
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134 void
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135 X11_DestroyImage(_THIS, SDL_Surface * screen)
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136 {
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137 if (SDL_Ximage) {
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138 XDestroyImage(SDL_Ximage);
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139 #ifndef NO_SHARED_MEMORY
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140 if (use_mitshm) {
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141 XShmDetach(SDL_Display, &shminfo);
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142 XSync(SDL_Display, False);
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143 shmdt(shminfo.shmaddr);
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144 }
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145 #endif /* ! NO_SHARED_MEMORY */
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146 SDL_Ximage = NULL;
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147 }
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148 if (screen) {
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149 screen->pixels = NULL;
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150 }
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151 }
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152
166
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153 /* Determine the number of CPUs in the system */
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154 static int
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155 num_CPU(void)
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156 {
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157 static int num_cpus = 0;
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158
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159 if (!num_cpus) {
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160 #if defined(__LINUX__)
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161 char line[BUFSIZ];
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162 FILE *pstat = fopen("/proc/stat", "r");
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163 if (pstat) {
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164 while (fgets(line, sizeof(line), pstat)) {
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165 if (SDL_memcmp(line, "cpu", 3) == 0 && line[3] != ' ') {
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166 ++num_cpus;
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167 }
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168 }
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169 fclose(pstat);
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170 }
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171 #elif defined(__IRIX__)
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172 num_cpus = sysconf(_SC_NPROC_ONLN);
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173 #elif defined(_SC_NPROCESSORS_ONLN)
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174 /* number of processors online (SVR4.0MP compliant machines) */
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175 num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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176 #elif defined(_SC_NPROCESSORS_CONF)
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177 /* number of processors configured (SVR4.0MP compliant machines) */
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178 num_cpus = sysconf(_SC_NPROCESSORS_CONF);
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179 #endif
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180 if (num_cpus <= 0) {
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181 num_cpus = 1;
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182 }
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183 }
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184 return num_cpus;
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185 }
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186
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187 int
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188 X11_ResizeImage(_THIS, SDL_Surface * screen, Uint32 flags)
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189 {
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190 int retval;
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191
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192 X11_DestroyImage(this, screen);
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193 if (flags & SDL_INTERNALOPENGL) { /* No image when using GL */
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194 retval = 0;
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195 } else {
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196 retval = X11_SetupImage(this, screen);
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197 /* We support asynchronous blitting on the display */
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198 if (flags & SDL_ASYNCBLIT) {
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199 /* This is actually slower on single-CPU systems,
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200 probably because of CPU contention between the
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201 X server and the application.
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202 Note: Is this still true with XFree86 4.0?
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203 */
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204 if (num_CPU() > 1) {
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205 screen->flags |= SDL_ASYNCBLIT;
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206 }
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207 }
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208 }
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209 return (retval);
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210 }
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211
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212 /* We don't actually allow hardware surfaces other than the main one */
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213 int
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214 X11_AllocHWSurface(_THIS, SDL_Surface * surface)
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215 {
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216 return (-1);
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217 }
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218
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219 void
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220 X11_FreeHWSurface(_THIS, SDL_Surface * surface)
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221 {
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222 return;
0
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223 }
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224
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225 int
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226 X11_LockHWSurface(_THIS, SDL_Surface * surface)
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227 {
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228 if ((surface == SDL_VideoSurface) && blit_queued) {
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229 XSync(GFX_Display, False);
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230 blit_queued = 0;
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231 }
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232 return (0);
0
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233 }
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234
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235 void
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236 X11_UnlockHWSurface(_THIS, SDL_Surface * surface)
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237 {
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238 return;
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239 }
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240
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241 int
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242 X11_FlipHWSurface(_THIS, SDL_Surface * surface)
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243 {
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244 return (0);
0
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245 }
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246
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247 static void
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248 X11_NormalUpdate(_THIS, int numrects, SDL_Rect * rects)
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249 {
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250 int i;
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251
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252 for (i = 0; i < numrects; ++i) {
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253 if (rects[i].w == 0 || rects[i].h == 0) { /* Clipped? */
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254 continue;
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255 }
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256 XPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
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257 rects[i].x, rects[i].y,
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258 rects[i].x, rects[i].y, rects[i].w, rects[i].h);
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259 }
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260 if (SDL_VideoSurface->flags & SDL_ASYNCBLIT) {
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261 XFlush(GFX_Display);
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262 blit_queued = 1;
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263 } else {
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264 XSync(GFX_Display, False);
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265 }
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266 }
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267
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268 static void
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269 X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect * rects)
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270 {
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271 #ifndef NO_SHARED_MEMORY
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272 int i;
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273
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274 for (i = 0; i < numrects; ++i) {
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275 if (rects[i].w == 0 || rects[i].h == 0) { /* Clipped? */
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276 continue;
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277 }
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278 XShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
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279 rects[i].x, rects[i].y,
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280 rects[i].x, rects[i].y, rects[i].w, rects[i].h, False);
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281 }
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282 if (SDL_VideoSurface->flags & SDL_ASYNCBLIT) {
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283 XFlush(GFX_Display);
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284 blit_queued = 1;
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285 } else {
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286 XSync(GFX_Display, False);
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287 }
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288 #endif /* ! NO_SHARED_MEMORY */
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289 }
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290
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291 /* There's a problem with the automatic refreshing of the display.
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292 Even though the XVideo code uses the GFX_Display to update the
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293 video memory, it appears that updating the window asynchronously
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294 from a different thread will cause "blackouts" of the window.
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295 This is a sort of a hacked workaround for the problem.
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296 */
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297 static int enable_autorefresh = 1;
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298
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299 void
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300 X11_DisableAutoRefresh(_THIS)
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301 {
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302 --enable_autorefresh;
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303 }
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304
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305 void
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306 X11_EnableAutoRefresh(_THIS)
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307 {
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308 ++enable_autorefresh;
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309 }
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310
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311 void
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312 X11_RefreshDisplay(_THIS)
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313 {
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314 /* Don't refresh a display that doesn't have an image (like GL)
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315 Instead, post an expose event so the application can refresh.
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316 */
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317 if (!SDL_Ximage || (enable_autorefresh <= 0)) {
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318 SDL_PrivateExpose();
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319 return;
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320 }
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321 #ifndef NO_SHARED_MEMORY
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322 if (this->UpdateRects == X11_MITSHMUpdate) {
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323 XShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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324 0, 0, SDL_CurrentWindow.offset_x,
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325 SDL_CurrentWindow.offset_y,
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326 SDL_CurrentDisplay.current_mode.w,
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327 SDL_CurrentDisplay.current_mode.h, False);
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328 } else
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329 #endif /* ! NO_SHARED_MEMORY */
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330 {
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331 XPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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332 0, 0, SDL_CurrentWindow.offset_x,
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333 SDL_CurrentWindow.offset_y,
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334 SDL_CurrentDisplay.current_mode.w,
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335 SDL_CurrentDisplay.current_mode.h);
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336 }
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337 XSync(SDL_Display, False);
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338 }
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339
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340 /* vi: set ts=4 sw=4 expandtab: */