annotate src/video/x11/SDL_x11image.c @ 1312:c9b51268668f

Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents 045f186426e1
children 3692456e7b0f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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
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23 #include <stdlib.h>
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24 #include <unistd.h>
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25
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26 #include "SDL_error.h"
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27 #include "SDL_endian.h"
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28 #include "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 if(!use_mitshm)
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48 return;
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49 shminfo.shmid = shmget(IPC_PRIVATE, screen->h*screen->pitch,
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50 IPC_CREAT | 0777);
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51 if ( shminfo.shmid >= 0 ) {
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52 shminfo.shmaddr = (char *)shmat(shminfo.shmid, 0, 0);
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53 shminfo.readOnly = False;
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54 if ( shminfo.shmaddr != (char *)-1 ) {
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55 shm_error = False;
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56 X_handler = pXSetErrorHandler(shm_errhandler);
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57 pXShmAttach(SDL_Display, &shminfo);
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58 pXSync(SDL_Display, True);
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59 pXSetErrorHandler(X_handler);
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60 if ( shm_error )
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61 shmdt(shminfo.shmaddr);
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62 } else {
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63 shm_error = True;
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64 }
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65 shmctl(shminfo.shmid, IPC_RMID, NULL);
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66 } else {
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67 shm_error = True;
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68 }
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69 if ( shm_error )
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70 use_mitshm = 0;
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71 if ( use_mitshm )
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72 screen->pixels = shminfo.shmaddr;
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73 }
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74 #endif /* ! NO_SHARED_MEMORY */
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75
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76 /* Various screen update functions available */
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77 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects);
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78 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects);
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79
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80 int X11_SetupImage(_THIS, SDL_Surface *screen)
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81 {
270
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82 #ifndef NO_SHARED_MEMORY
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83 try_mitshm(this, screen);
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84 if(use_mitshm) {
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85 SDL_Ximage = pXShmCreateImage(SDL_Display, SDL_Visual,
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86 this->hidden->depth, ZPixmap,
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87 shminfo.shmaddr, &shminfo,
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88 screen->w, screen->h);
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89 if(!SDL_Ximage) {
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90 pXShmDetach(SDL_Display, &shminfo);
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91 pXSync(SDL_Display, False);
270
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92 shmdt(shminfo.shmaddr);
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93 screen->pixels = NULL;
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94 goto error;
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95 }
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96 this->UpdateRects = X11_MITSHMUpdate;
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97 }
551
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98 if(!use_mitshm)
270
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99 #endif /* not NO_SHARED_MEMORY */
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100 {
270
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101 int bpp;
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102 screen->pixels = malloc(screen->h*screen->pitch);
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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 bpp = screen->format->BytesPerPixel;
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108 SDL_Ximage = pXCreateImage(SDL_Display, SDL_Visual,
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109 this->hidden->depth, ZPixmap, 0,
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110 (char *)screen->pixels,
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111 screen->w, screen->h,
270
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112 32, 0);
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113 if ( SDL_Ximage == NULL )
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114 goto error;
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115 /* XPutImage will convert byte sex automatically */
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116 SDL_Ximage->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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117 ? MSBFirst : LSBFirst;
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118 this->UpdateRects = X11_NormalUpdate;
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119 }
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120 screen->pitch = SDL_Ximage->bytes_per_line;
270
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121 return(0);
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122
270
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123 error:
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124 SDL_SetError("Couldn't create XImage");
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125 return 1;
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126 }
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127
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128 void X11_DestroyImage(_THIS, SDL_Surface *screen)
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129 {
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130 if ( SDL_Ximage ) {
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131 pXDestroyImage(SDL_Ximage);
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132 #ifndef NO_SHARED_MEMORY
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133 if ( use_mitshm ) {
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134 pXShmDetach(SDL_Display, &shminfo);
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135 pXSync(SDL_Display, False);
0
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136 shmdt(shminfo.shmaddr);
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137 }
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138 #endif /* ! NO_SHARED_MEMORY */
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139 SDL_Ximage = NULL;
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140 }
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141 if ( screen ) {
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142 screen->pixels = NULL;
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143 }
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144 }
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145
166
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146 /* Determine the number of CPUs in the system */
0
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147 static int num_CPU(void)
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148 {
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149 static int num_cpus = 0;
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150
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151 if(!num_cpus) {
166
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152 #if defined(__linux)
0
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153 char line[BUFSIZ];
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154 FILE *pstat = fopen("/proc/stat", "r");
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155 if ( pstat ) {
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156 while ( fgets(line, sizeof(line), pstat) ) {
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157 if (memcmp(line, "cpu", 3) == 0 && line[3] != ' ') {
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158 ++num_cpus;
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159 }
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160 }
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161 fclose(pstat);
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162 }
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163 #elif defined(__sgi)
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164 num_cpus = sysconf(_SC_NPROC_ONLN);
166
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165 #elif defined(_SC_NPROCESSORS_ONLN)
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166 /* number of processors online (SVR4.0MP compliant machines) */
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167 num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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168 #elif defined(_SC_NPROCESSORS_CONF)
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169 /* number of processors configured (SVR4.0MP compliant machines) */
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170 num_cpus = sysconf(_SC_NPROCESSORS_CONF);
0
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171 #endif
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172 if ( num_cpus <= 0 ) {
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173 num_cpus = 1;
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174 }
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175 }
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176 return num_cpus;
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177 }
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178
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179 int X11_ResizeImage(_THIS, SDL_Surface *screen, Uint32 flags)
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180 {
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181 int retval;
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182
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183 X11_DestroyImage(this, screen);
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184 if ( flags & SDL_OPENGL ) { /* No image when using GL */
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185 retval = 0;
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186 } else {
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187 retval = X11_SetupImage(this, screen);
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188 /* We support asynchronous blitting on the display */
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189 if ( flags & SDL_ASYNCBLIT ) {
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190 /* This is actually slower on single-CPU systems,
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191 probably because of CPU contention between the
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192 X server and the application.
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193 Note: Is this still true with XFree86 4.0?
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194 */
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195 if ( num_CPU() > 1 ) {
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196 screen->flags |= SDL_ASYNCBLIT;
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197 }
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198 }
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199 }
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200 return(retval);
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201 }
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202
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203 /* We don't actually allow hardware surfaces other than the main one */
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204 int X11_AllocHWSurface(_THIS, SDL_Surface *surface)
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205 {
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206 return(-1);
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207 }
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208 void X11_FreeHWSurface(_THIS, SDL_Surface *surface)
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209 {
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210 return;
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211 }
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212
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213 int X11_LockHWSurface(_THIS, SDL_Surface *surface)
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214 {
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215 if ( (surface == SDL_VideoSurface) && blit_queued ) {
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216 pXSync(GFX_Display, False);
0
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217 blit_queued = 0;
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218 }
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219 return(0);
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220 }
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221 void X11_UnlockHWSurface(_THIS, SDL_Surface *surface)
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222 {
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223 return;
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224 }
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225
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226 int X11_FlipHWSurface(_THIS, SDL_Surface *surface)
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227 {
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228 return(0);
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229 }
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230
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231 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects)
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232 {
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233 int i;
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
234
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
235 for (i = 0; i < numrects; ++i) {
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
236 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
237 continue;
0
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238 }
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239 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
240 rects[i].x, rects[i].y,
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
241 rects[i].x, rects[i].y, rects[i].w, rects[i].h);
0
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242 }
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243 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) {
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244 pXFlush(GFX_Display);
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
245 blit_queued = 1;
0
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246 } else {
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247 pXSync(GFX_Display, False);
0
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248 }
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249 }
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diff changeset
250
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251 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects)
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diff changeset
252 {
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diff changeset
253 #ifndef NO_SHARED_MEMORY
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254 int i;
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diff changeset
255
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diff changeset
256 for ( i=0; i<numrects; ++i ) {
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
257 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */
0
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parents:
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258 continue;
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diff changeset
259 }
1168
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260 pXShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
0
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261 rects[i].x, rects[i].y,
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262 rects[i].x, rects[i].y, rects[i].w, rects[i].h,
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263 False);
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diff changeset
264 }
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265 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) {
1168
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266 pXFlush(GFX_Display);
270
37fa1484f71b From: "Mattias Engdeg�rd" <f91-men@nada.kth.se>
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parents: 252
diff changeset
267 blit_queued = 1;
0
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268 } else {
1168
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269 pXSync(GFX_Display, False);
0
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diff changeset
270 }
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diff changeset
271 #endif /* ! NO_SHARED_MEMORY */
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parents:
diff changeset
272 }
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diff changeset
273
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274 /* There's a problem with the automatic refreshing of the display.
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diff changeset
275 Even though the XVideo code uses the GFX_Display to update the
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diff changeset
276 video memory, it appears that updating the window asynchronously
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diff changeset
277 from a different thread will cause "blackouts" of the window.
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parents:
diff changeset
278 This is a sort of a hacked workaround for the problem.
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parents:
diff changeset
279 */
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diff changeset
280 static int enable_autorefresh = 1;
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diff changeset
281
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diff changeset
282 void X11_DisableAutoRefresh(_THIS)
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parents:
diff changeset
283 {
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parents:
diff changeset
284 --enable_autorefresh;
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parents:
diff changeset
285 }
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diff changeset
286
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diff changeset
287 void X11_EnableAutoRefresh(_THIS)
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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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diff changeset
292 void X11_RefreshDisplay(_THIS)
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293 {
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294 /* Don't refresh a display that doesn't have an image (like GL)
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295 Instead, post an expose event so the application can refresh.
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296 */
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297 if ( ! SDL_Ximage || (enable_autorefresh <= 0) ) {
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298 SDL_PrivateExpose();
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299 return;
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300 }
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301 #ifndef NO_SHARED_MEMORY
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302 if ( this->UpdateRects == X11_MITSHMUpdate ) {
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303 pXShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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304 0, 0, 0, 0, this->screen->w, this->screen->h,
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305 False);
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306 } else
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307 #endif /* ! NO_SHARED_MEMORY */
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308 {
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309 pXPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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310 0, 0, 0, 0, this->screen->w, this->screen->h);
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311 }
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312 pXSync(SDL_Display, False);
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313 }