-/* xscreensaver, Copyright (c) 1992-2002 Jamie Zawinski <jwz@jwz.org>
+/* xscreensaver, Copyright (c) 1992-2008 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
static void fade_screens_1 (Display *dpy, Colormap *cmaps,
- Window *black_windows, int seconds, int ticks,
+ Window *black_windows, int nwindows,
+ int seconds, int ticks,
Bool out_p, Bool clear_windows);
#ifdef HAVE_SGI_VC_EXTENSION
static int sgi_gamma_fade (Display *dpy,
- Window *black_windows, int seconds, int ticks,
+ Window *black_windows, int nwindows,
+ int seconds, int ticks,
Bool out_p, Bool clear_windows);
#endif /* HAVE_SGI_VC_EXTENSION */
#ifdef HAVE_XF86VMODE_GAMMA
static int xf86_gamma_fade (Display *dpy,
- Window *black_windows, int seconds, int ticks,
+ Window *black_windows, int nwindows,
+ int seconds, int ticks,
Bool out_p, Bool clear_windows);
#endif /* HAVE_XF86VMODE_GAMMA */
void
-fade_screens (Display *dpy, Colormap *cmaps, Window *black_windows,
+fade_screens (Display *dpy, Colormap *cmaps,
+ Window *black_windows, int nwindows,
int seconds, int ticks,
Bool out_p, Bool clear_windows)
{
#ifdef HAVE_SGI_VC_EXTENSION
/* First try to do it by fading the gamma in an SGI-specific way... */
- if (0 == sgi_gamma_fade(dpy, black_windows, seconds, ticks, out_p,
+ if (0 == sgi_gamma_fade(dpy, black_windows, nwindows,
+ seconds, ticks, out_p,
clear_windows))
;
else
#ifdef HAVE_XF86VMODE_GAMMA
/* Then try to do it by fading the gamma in an XFree86-specific way... */
- if (0 == xf86_gamma_fade(dpy, black_windows, seconds, ticks, out_p,
+ if (0 == xf86_gamma_fade(dpy, black_windows, nwindows,
+ seconds, ticks, out_p,
clear_windows))
;
else
/* Else, do it the old-fashioned way, which (somewhat) loses if
there are TrueColor windows visible. */
- fade_screens_1 (dpy, cmaps, black_windows, seconds, ticks,
+ fade_screens_1 (dpy, cmaps, black_windows, nwindows,
+ seconds, ticks,
out_p, clear_windows);
/* If we were supposed to be fading in, do so now (we just faded out,
}
+static void
+sleep_from (struct timeval *now, struct timeval *then, long usecs_per_step)
+{
+ /* If several seconds have passed, the machine must have been asleep
+ or thrashing or something. Don't sleep in that case, to avoid
+ overflowing and sleeping for an unconscionably long time. This
+ function should only be sleeping for very short periods.
+ */
+ if (now->tv_sec - then->tv_sec < 5)
+ {
+ long diff = (((now->tv_sec - then->tv_sec) * 1000000) +
+ now->tv_usec - then->tv_usec);
+ if (usecs_per_step > diff)
+ usleep (usecs_per_step - diff);
+ }
+
+ then->tv_sec = now->tv_sec;
+ then->tv_usec = now->tv_usec;
+}
+
+
+
/* The business with `cmaps_per_screen' is to fake out the SGI 8-bit video
hardware, which is capable of installing multiple (4) colormaps
- simultaniously. We have to install multiple copies of the same set of
+ simultaneously. We have to install multiple copies of the same set of
colors in order to fill up all the available slots in the hardware color
lookup table, so we install an extra N colormaps per screen to make sure
that all screens really go black.
what is implemented in sgi_gamma_fade(), so we use that if we can.
*/
static void
-fade_screens_1 (Display *dpy, Colormap *cmaps, Window *black_windows,
+fade_screens_1 (Display *dpy, Colormap *cmaps,
+ Window *black_windows, int nwindows,
int seconds, int ticks,
Bool out_p, Bool clear_windows)
{
installed = True;
if (black_windows && !out_p)
- for (j = 0; j < nscreens; j++)
+ for (j = 0; j < nwindows; j++)
if (black_windows[j])
{
XUnmapWindow (dpy, black_windows[j]);
/* If we haven't already used up our alotted time, sleep to avoid
changing the colormap too fast. */
- {
- long diff = (((now.tv_sec - then.tv_sec) * 1000000) +
- now.tv_usec - then.tv_usec);
- then.tv_sec = now.tv_sec;
- then.tv_usec = now.tv_usec;
- if (usecs_per_step > diff)
- usleep (usecs_per_step - diff);
- }
+ sleep_from (&now, &then, usecs_per_step);
}
DONE:
*/
if (out_p && black_windows)
{
- for (i = 0; i < nscreens; i++)
+ for (i = 0; i < nwindows; i++)
{
if (clear_windows)
XClearWindow (dpy, black_windows[i]);
static int
sgi_gamma_fade (Display *dpy,
- Window *black_windows, int seconds, int ticks,
+ Window *black_windows, int nwindows,
+ int seconds, int ticks,
Bool out_p, Bool clear_windows)
{
int steps = seconds * ticks;
way down to 0, then take the windows off the screen.
*/
if (!out_p)
- for (screen = 0; screen < nscreens; screen++)
- {
+ {
+ for (screen = 0; screen < nscreens; screen++)
sgi_whack_gamma(dpy, screen, &info[screen], 0.0);
+
+ for (screen = 0; screen < nwindows; screen++)
if (black_windows && black_windows[screen])
{
XUnmapWindow (dpy, black_windows[screen]);
XClearWindow (dpy, black_windows[screen]);
XSync(dpy, False);
}
- }
-
+ }
/* Iterate by steps of the animation... */
for (i = (out_p ? steps : 0);
/* If we haven't already used up our alotted time, sleep to avoid
changing the colormap too fast. */
- {
- long diff = (((now.tv_sec - then.tv_sec) * 1000000) +
- now.tv_usec - then.tv_usec);
- then.tv_sec = now.tv_sec;
- then.tv_usec = now.tv_usec;
- if (usecs_per_step > diff)
- usleep (usecs_per_step - diff);
- }
+ sleep_from (&now, &then, usecs_per_step);
}
}
if (out_p && black_windows)
{
- for (screen = 0; screen < nscreens; screen++)
+ for (screen = 0; screen < nwindows; screen++)
{
if (clear_windows)
XClearWindow (dpy, black_windows[screen]);
static int
xf86_gamma_fade (Display *dpy,
- Window *black_windows, int seconds, int ticks,
+ Window *black_windows, int nwindows,
+ int seconds, int ticks,
Bool out_p, Bool clear_windows)
{
int steps = seconds * ticks;
way down to 0, then take the windows off the screen.
*/
if (!out_p)
- for (screen = 0; screen < nscreens; screen++)
- {
+ {
+ for (screen = 0; screen < nscreens; screen++)
xf86_whack_gamma(dpy, screen, &info[screen], 0.0);
+ for (screen = 0; screen < nwindows; screen++)
if (black_windows && black_windows[screen])
{
XUnmapWindow (dpy, black_windows[screen]);
XClearWindow (dpy, black_windows[screen]);
XSync(dpy, False);
}
- }
-
+ }
/* Iterate by steps of the animation... */
for (i = (out_p ? steps : 0);
/* If we haven't already used up our alotted time, sleep to avoid
changing the colormap too fast. */
- {
- long diff = (((now.tv_sec - then.tv_sec) * 1000000) +
- now.tv_usec - then.tv_usec);
- then.tv_sec = now.tv_sec;
- then.tv_usec = now.tv_usec;
- if (usecs_per_step > diff)
- usleep (usecs_per_step - diff);
- }
+ sleep_from (&now, &then, usecs_per_step);
}
}
if (out_p && black_windows)
{
- for (screen = 0; screen < nscreens; screen++)
+ for (screen = 0; screen < nwindows; screen++)
{
if (clear_windows)
XClearWindow (dpy, black_windows[screen]);