Mercurial > sdl-ios-xcode
annotate test/threadwin.c @ 4139:568c9b3c0167 SDL-1.2
* Added configure option --enable-screensaver, to allow enabling the screensaver by default.
* Use XResetScreenSaver() instead of disabling screensaver entirely.
Full discussion summary from Erik on the SDL mailing list:
Current behaviour
=================
SDL changes the user's display power management settings without
permission from the user and without telling the user.
The interface that it uses to do so is DPMSDisable/DPMSEnable, which
should only ever be used by configuration utilities like KControl, never
by normal application programs, let alone by the libraries that they
use. Using an interface that is not at all intended for what SDL tries
to achieve means that it will not work as it should. Firstly, the power
management is completely disabled during the whole lifetime of the SDL
program, not only when it should be. Secondly, it makes SDL
non-reentrant, meaning that things will break when multiple SDL programs
are clients of the same X server simultaneously. Thirdly, no cleanup
mechanism ensures that the setting is restored if the client does not do
that (for example if it crashes).
In addition to that, this interface is broken on xorg,
[http://bugs.freedesktop.org/show_bug.cgi?id=13962], so what SDL tries
to do does not work at all on that implementation of the X Window
System. (The reason that the DPMSEnable works in KControl is that it
calls DPMSSetTimeout immediately after,
[http://websvn.kde.org/tags/KDE/3.5.9/kdebase/kcontrol/energy/energy.cpp?annotate=774532#l343]).
The problems that the current behaviour causes
==============================================
1. Information leak. When the user is away, someone might see what the
user has on the display when the user counts on the screensaver
preventing this. This does not even require physical access to the
workstation, it is enough to see it from a distance.
2. Draining battery. An SDL program that runs on a laptop will quickly
drain the battery while the user is away. The system will soon shut down
and require recharging before being usable again, while it should in
fact have consumed very little energy if the user's settings would have
been obeyed.
3. Wasting energy. Even if battery issues are not considered, energy as
such is wasted.
4. Display wear. The display may be worn out.
The problems that the current behaviour tries to solve
======================================================
1. Preventing screensaver while playing movies.
Many SDL applications are media players. They have reasons to prevent
screensavers from being activated while a movie is being played. When a
user clicks on the play button it can be interpreted as saying "play
this movie, but do not turn off the display while playing it, because I
will watch it even though I do not interact with the system".
2. Preventing screensaver when some input bypasses X.
Sometimes SDL uses input from another source than the X server, so
that the X server is bypassed. This obviously breaks the screensaver
handling. SDL tries to work around that.
3. Preventing screensaver when all input bypasses X.
There is something called Direct Graphics Access mode, where a
program takes control of both the display and the input devices from the
X server. This obviously means that the X server can not handle the
screensaver alone, since screensaver handling depends on input handling.
SDL does not do what it should to help the X server to handle the
screensaver. Nor does SDL take care of screeensaver handling itself. SDL
simply disables the screensaver completely.
How the problems should be solved
=================================
The correct way for an application program to prevent the screensaver
under X is to call XResetScreenSaver. This was recently discovered and
implemented by the mplayer developers,
[http://svn.mplayerhq.hu/mplayer?view=rev&revision=25637]. SDL needs to
wrap this in an API call (SDL_ResetScreenSaver) and implement it for the
other video targets (if they do not have a corresponding call, SDL
should do what it takes on that particular target, for example sending
fake key events).
1. When a movie is played, the player should reset the screensaver when
the animation is advanced to a new frame. The same applies to anything
similar, like slideshows.
2. When the X server is handling input, it must handle all input
(keyboards, mice, gamepads, ...). This is necessary, not only to be able
to handle the screensaver, but also so that it can send the events to
the correct (the currently active) client. If there is an input device
that the X server can not handle for some reason (such as lack of Plug
and Play capability), the program that handles the device as a
workaround must simulate what would happen if the X server would have
handled the device, by calling XResetScreenSaver when input is received
from the device.
3. When the X server is not handling the input, it depends on the
program that does to call XResetScreenSaver whenever an input event
occurs. Alternatively the program must handle the screensaver countdown
internally and call XActivateScreenSaver.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 29 Feb 2008 13:55:44 +0000 |
| parents | 3868bebb9f5b |
| children |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 /* Test out the multi-threaded event handling functions */ | |
| 3 | |
| 4 #include <stdlib.h> | |
| 5 #include <stdio.h> | |
| 6 #include <string.h> | |
| 7 | |
| 8 #include "SDL.h" | |
| 9 #include "SDL_thread.h" | |
| 10 | |
| 11 /* Are we done yet? */ | |
| 12 static int done = 0; | |
| 13 | |
| 14 /* Is the cursor visible? */ | |
| 15 static int visible = 1; | |
| 16 | |
|
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17 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
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18 static void quit(int rc) |
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19 { |
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20 SDL_Quit(); |
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21 exit(rc); |
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22 } |
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23 |
| 0 | 24 SDL_Surface *LoadIconSurface(char *file, Uint8 **maskp) |
| 25 { | |
| 26 SDL_Surface *icon; | |
| 27 Uint8 *pixels; | |
| 28 Uint8 *mask; | |
| 29 int mlen, i; | |
| 30 | |
| 31 *maskp = NULL; | |
| 32 | |
| 33 /* Load the icon surface */ | |
| 34 icon = SDL_LoadBMP(file); | |
| 35 if ( icon == NULL ) { | |
| 36 fprintf(stderr, "Couldn't load %s: %s\n", file, SDL_GetError()); | |
| 37 return(NULL); | |
| 38 } | |
| 39 | |
| 40 /* Check width and height */ | |
| 41 if ( (icon->w%8) != 0 ) { | |
| 42 fprintf(stderr, "Icon width must be a multiple of 8!\n"); | |
| 43 SDL_FreeSurface(icon); | |
| 44 return(NULL); | |
| 45 } | |
| 46 if ( icon->format->palette == NULL ) { | |
| 47 fprintf(stderr, "Icon must have a palette!\n"); | |
| 48 SDL_FreeSurface(icon); | |
| 49 return(NULL); | |
| 50 } | |
| 51 | |
| 52 /* Set the colorkey */ | |
| 53 SDL_SetColorKey(icon, SDL_SRCCOLORKEY, *((Uint8 *)icon->pixels)); | |
| 54 | |
| 55 /* Create the mask */ | |
| 56 pixels = (Uint8 *)icon->pixels; | |
| 57 printf("Transparent pixel: (%d,%d,%d)\n", | |
| 58 icon->format->palette->colors[*pixels].r, | |
| 59 icon->format->palette->colors[*pixels].g, | |
| 60 icon->format->palette->colors[*pixels].b); | |
| 61 mlen = icon->w*icon->h; | |
| 62 mask = (Uint8 *)malloc(mlen/8); | |
| 63 if ( mask == NULL ) { | |
| 64 fprintf(stderr, "Out of memory!\n"); | |
| 65 SDL_FreeSurface(icon); | |
| 66 return(NULL); | |
| 67 } | |
| 68 memset(mask, 0, mlen/8); | |
| 69 for ( i=0; i<mlen; ) { | |
| 70 if ( pixels[i] != *pixels ) | |
| 71 mask[i/8] |= 0x01; | |
| 72 ++i; | |
| 73 if ( (i%8) != 0 ) | |
| 74 mask[i/8] <<= 1; | |
| 75 } | |
| 76 *maskp = mask; | |
| 77 return(icon); | |
| 78 } | |
| 79 | |
| 1769 | 80 int SDLCALL FilterEvents(const SDL_Event *event) |
| 0 | 81 { |
| 82 static int reallyquit = 0; | |
| 83 | |
| 84 switch (event->type) { | |
| 85 | |
| 86 case SDL_ACTIVEEVENT: | |
| 87 /* See what happened */ | |
| 88 printf("App %s ", | |
| 89 event->active.gain ? "gained" : "lost"); | |
| 90 if ( event->active.state & SDL_APPACTIVE ) | |
| 91 printf("active "); | |
| 92 if ( event->active.state & SDL_APPMOUSEFOCUS ) | |
| 93 printf("mouse "); | |
| 94 if ( event->active.state & SDL_APPINPUTFOCUS ) | |
| 95 printf("input "); | |
| 96 printf("focus\n"); | |
| 97 | |
| 98 /* See if we are iconified or restored */ | |
| 99 if ( event->active.state & SDL_APPACTIVE ) { | |
| 100 printf("App has been %s\n", | |
| 101 event->active.gain ? | |
| 102 "restored" : "iconified"); | |
| 103 } | |
| 104 return(0); | |
| 105 | |
| 106 /* This is important! Queue it if we want to quit. */ | |
| 107 case SDL_QUIT: | |
| 108 if ( ! reallyquit ) { | |
| 109 reallyquit = 1; | |
| 110 printf("Quit requested\n"); | |
| 111 return(0); | |
| 112 } | |
| 113 printf("Quit demanded\n"); | |
| 114 return(1); | |
| 115 | |
| 116 /* Mouse and keyboard events go to threads */ | |
| 117 case SDL_MOUSEMOTION: | |
| 118 case SDL_MOUSEBUTTONDOWN: | |
| 119 case SDL_MOUSEBUTTONUP: | |
| 120 case SDL_KEYDOWN: | |
| 121 case SDL_KEYUP: | |
| 122 return(1); | |
| 123 | |
| 124 /* Drop all other events */ | |
| 125 default: | |
| 126 return(0); | |
| 127 } | |
| 128 } | |
| 129 | |
| 1769 | 130 int SDLCALL HandleMouse(void *unused) |
| 0 | 131 { |
| 132 SDL_Event events[10]; | |
| 133 int i, found; | |
| 134 Uint32 mask; | |
| 135 | |
| 136 /* Handle mouse events here */ | |
| 137 mask = (SDL_MOUSEMOTIONMASK|SDL_MOUSEBUTTONDOWNMASK|SDL_MOUSEBUTTONUPMASK); | |
| 138 while ( ! done ) { | |
| 139 found = SDL_PeepEvents(events, 10, SDL_GETEVENT, mask); | |
| 140 for ( i=0; i<found; ++i ) { | |
| 141 switch(events[i].type) { | |
| 142 /* We want to toggle visibility on buttonpress */ | |
| 143 case SDL_MOUSEBUTTONDOWN: | |
| 144 case SDL_MOUSEBUTTONUP: | |
| 145 if ( events[i].button.state == SDL_PRESSED ) { | |
| 146 visible = !visible; | |
| 147 SDL_ShowCursor(visible); | |
| 148 } | |
| 149 printf("Mouse button %d has been %s\n", | |
| 150 events[i].button.button, | |
| 151 (events[i].button.state == SDL_PRESSED) ? | |
| 152 "pressed" : "released"); | |
| 153 break; | |
| 154 /* Show relative mouse motion */ | |
| 155 case SDL_MOUSEMOTION: | |
| 156 printf("Mouse relative motion: {%d,%d}\n", | |
| 157 events[i].motion.xrel, events[i].motion.yrel); | |
| 158 break; | |
| 159 } | |
| 160 } | |
| 161 /* Give up some CPU to allow events to arrive */ | |
| 162 SDL_Delay(20); | |
| 163 } | |
| 164 return(0); | |
| 165 } | |
| 166 | |
| 1769 | 167 int SDLCALL HandleKeyboard(void *unused) |
| 0 | 168 { |
| 169 SDL_Event events[10]; | |
| 170 int i, found; | |
| 171 Uint32 mask; | |
| 172 | |
| 173 /* Handle mouse events here */ | |
| 174 mask = (SDL_KEYDOWNMASK|SDL_KEYUPMASK); | |
| 175 while ( ! done ) { | |
| 176 found = SDL_PeepEvents(events, 10, SDL_GETEVENT, mask); | |
| 177 for ( i=0; i<found; ++i ) { | |
| 178 switch(events[i].type) { | |
| 179 /* We want to toggle visibility on buttonpress */ | |
| 180 case SDL_KEYDOWN: | |
| 181 case SDL_KEYUP: | |
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182 printf("Key '%c' (keysym==%d) has been %s\n", |
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183 events[i].key.keysym.unicode, |
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184 (int) events[i].key.keysym.sym, |
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185 (events[i].key.state == SDL_PRESSED) ? |
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186 "pressed" : "released"); |
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187 |
| 0 | 188 /* Allow hitting <ESC> to quit the app */ |
| 189 if ( events[i].key.keysym.sym == SDLK_ESCAPE ) { | |
| 190 done = 1; | |
| 191 } | |
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192 |
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193 /* skip events now that aren't KEYUPs... */ |
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194 if (events[i].key.state == SDL_PRESSED) |
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195 break; |
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196 |
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197 if ( events[i].key.keysym.sym == SDLK_f ) { |
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198 int rc = 0; |
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199 printf("attempting to toggle fullscreen...\n"); |
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200 rc = SDL_WM_ToggleFullScreen(SDL_GetVideoSurface()); |
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201 printf("SDL_WM_ToggleFullScreen returned %d.\n", rc); |
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202 } |
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203 |
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204 if ( events[i].key.keysym.sym == SDLK_g ) { |
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205 SDL_GrabMode m; |
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206 m = SDL_WM_GrabInput(SDL_GRAB_QUERY) == SDL_GRAB_ON ? |
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207 SDL_GRAB_OFF : SDL_GRAB_ON; |
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208 printf("attempting to toggle input grab to %s...\n", |
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209 m == SDL_GRAB_ON ? "ON" : "OFF"); |
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210 SDL_WM_GrabInput(m); |
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211 printf("attempt finished.\n"); |
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212 } |
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213 |
| 0 | 214 break; |
| 215 } | |
| 216 } | |
| 217 /* Give up some CPU to allow events to arrive */ | |
| 218 SDL_Delay(20); | |
| 219 } | |
| 220 return(0); | |
| 221 } | |
| 222 | |
| 223 int main(int argc, char *argv[]) | |
| 224 { | |
| 225 SDL_Surface *screen; | |
| 226 SDL_Surface *icon; | |
| 227 Uint8 *icon_mask; | |
| 228 int i, parsed; | |
| 229 Uint8 *buffer; | |
| 230 SDL_Color palette[256]; | |
| 231 Uint32 init_flags; | |
| 232 Uint8 video_bpp; | |
| 233 Uint32 video_flags; | |
| 234 SDL_Thread *mouse_thread; | |
| 235 SDL_Thread *keybd_thread; | |
| 236 | |
| 237 /* Set the options, based on command line arguments */ | |
| 238 init_flags = SDL_INIT_VIDEO; | |
| 239 video_bpp = 8; | |
| 240 video_flags = SDL_SWSURFACE; | |
| 241 parsed = 1; | |
| 242 while ( parsed ) { | |
| 243 /* If the threaded option is enabled, and the SDL library hasn't | |
| 244 been compiled with threaded events enabled, then the mouse and | |
| 245 keyboard won't respond. | |
| 246 */ | |
| 247 if ( (argc >= 2) && (strcmp(argv[1], "-threaded") == 0) ) { | |
| 248 init_flags |= SDL_INIT_EVENTTHREAD; | |
| 249 argc -= 1; | |
| 250 argv += 1; | |
| 251 printf("Running with threaded events\n"); | |
| 252 } else | |
| 253 if ( (argc >= 2) && (strcmp(argv[1], "-fullscreen") == 0) ) { | |
| 254 video_flags |= SDL_FULLSCREEN; | |
| 255 argc -= 1; | |
| 256 argv += 1; | |
| 257 } else | |
| 258 if ( (argc >= 3) && (strcmp(argv[1], "-bpp") == 0) ) { | |
| 259 video_bpp = atoi(argv[2]); | |
| 260 argc -= 2; | |
| 261 argv += 2; | |
| 262 } else { | |
| 263 parsed = 0; | |
| 264 } | |
| 265 } | |
| 266 | |
| 267 /* Initialize SDL with the requested flags */ | |
| 268 if ( SDL_Init(init_flags) < 0 ) { | |
| 269 fprintf(stderr, | |
| 270 "Couldn't initialize SDL: %s\n", SDL_GetError()); | |
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271 return(1); |
| 0 | 272 } |
| 273 | |
| 274 /* Set the icon -- this must be done before the first mode set */ | |
| 275 icon = LoadIconSurface("icon.bmp", &icon_mask); | |
| 276 if ( icon != NULL ) { | |
| 277 SDL_WM_SetIcon(icon, icon_mask); | |
| 278 } | |
| 279 if ( icon_mask != NULL ) | |
| 280 free(icon_mask); | |
| 281 | |
| 282 /* Initialize the display */ | |
| 283 screen = SDL_SetVideoMode(640, 480, video_bpp, video_flags); | |
| 284 if ( screen == NULL ) { | |
| 285 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", | |
| 286 video_bpp, SDL_GetError()); | |
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287 quit(1); |
| 0 | 288 } |
| 289 printf("Running in %s mode\n", screen->flags & SDL_FULLSCREEN ? | |
| 290 "fullscreen" : "windowed"); | |
| 291 | |
| 292 /* Enable printable characters */ | |
| 293 SDL_EnableUNICODE(1); | |
| 294 | |
| 295 /* Set an event filter that discards everything but QUIT */ | |
| 296 SDL_SetEventFilter(FilterEvents); | |
| 297 | |
| 298 /* Create the event handling threads */ | |
| 299 mouse_thread = SDL_CreateThread(HandleMouse, NULL); | |
| 300 keybd_thread = SDL_CreateThread(HandleKeyboard, NULL); | |
| 301 | |
| 302 /* Set the surface pixels and refresh! */ | |
| 303 for ( i=0; i<256; ++i ) { | |
| 304 palette[i].r = 255-i; | |
| 305 palette[i].g = 255-i; | |
| 306 palette[i].b = 255-i; | |
| 307 } | |
| 308 SDL_SetColors(screen, palette, 0, 256); | |
| 309 if ( SDL_LockSurface(screen) < 0 ) { | |
| 310 fprintf(stderr, "Couldn't lock display surface: %s\n", | |
| 311 SDL_GetError()); | |
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312 quit(2); |
| 0 | 313 } |
| 314 buffer = (Uint8 *)screen->pixels; | |
| 315 for ( i=0; i<screen->h; ++i ) { | |
| 316 memset(buffer,(i*255)/screen->h, | |
| 317 screen->w*screen->format->BytesPerPixel); | |
| 318 buffer += screen->pitch; | |
| 319 } | |
| 320 SDL_UnlockSurface(screen); | |
| 321 SDL_UpdateRect(screen, 0, 0, 0, 0); | |
| 322 | |
| 323 /* Loop, waiting for QUIT */ | |
| 324 while ( ! done ) { | |
| 325 if ( ! (init_flags & SDL_INIT_EVENTTHREAD) ) { | |
| 326 SDL_PumpEvents(); /* Needed when event thread is off */ | |
| 327 } | |
| 328 if ( SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, SDL_QUITMASK) ) { | |
| 329 done = 1; | |
| 330 } | |
| 331 /* Give up some CPU so the events can accumulate */ | |
| 332 SDL_Delay(20); | |
| 333 } | |
| 334 SDL_WaitThread(mouse_thread, NULL); | |
| 335 SDL_WaitThread(keybd_thread, NULL); | |
|
1151
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
562
diff
changeset
|
336 SDL_Quit(); |
| 0 | 337 return(0); |
| 338 } |