/* xlockmore.c --- xscreensaver compatibility layer for xlockmore modules.
- * xscreensaver, Copyright (c) 1997-2014 Jamie Zawinski <jwz@jwz.org>
+ * xscreensaver, Copyright (c) 1997-2017 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
# include <X11/Intrinsic.h>
#endif /* !HAVE_JWXYZ */
+#include <assert.h>
+#include <float.h>
+
#define countof(x) (sizeof((x))/sizeof(*(x)))
#define MAX_COLORS (1L<<13)
}
+static void
+xlockmore_free_screens (ModeInfo *mi)
+{
+ struct xlockmore_function_table *xlmft = mi->xlmft;
+
+ /* Optimization: xlockmore_read_resources calls this lots on first start. */
+ if (!xlmft->got_init)
+ return;
+
+ /* Order is important here: */
+
+ /* 1. Call free_## for all screens. */
+ if (xlmft->hack_free_state) {
+ int old_screen = mi->screen_number;
+ for (mi->screen_number = 0; mi->screen_number < XLOCKMORE_NUM_SCREENS;
+ ++mi->screen_number) {
+ xlmft->hack_free_state (mi);
+ }
+ mi->screen_number = old_screen;
+ }
+
+ /* 2. Call release_##, if it exists. */
+ if (xlmft->hack_release)
+ xlmft->hack_release (mi);
+
+ /* 3. Free the state array. */
+ if (xlmft->state_array) {
+ free(*xlmft->state_array);
+ *xlmft->state_array = NULL;
+ xlmft->state_array = NULL;
+ }
+
+ /* 4. Pretend FreeAllGL(mi) gets called here. */
+
+ mi->xlmft->got_init = 0;
+}
+
+
static void
xlockmore_read_resources (ModeInfo *mi)
{
int *var_i = (int *) var;
float *var_f = (float *) var;
+ /* If any of the options changed, stop this hack's other instances. */
switch (xlockmore_opts->vars[i].type)
- {
- case t_String:
- *var_c = get_string_resource (dpy, xlockmore_opts->vars[i].name,
- xlockmore_opts->vars[i].classname);
- break;
- case t_Float:
- *var_f = get_float_resource (dpy, xlockmore_opts->vars[i].name,
- xlockmore_opts->vars[i].classname);
- break;
- case t_Int:
- *var_i = get_integer_resource (dpy, xlockmore_opts->vars[i].name,
- xlockmore_opts->vars[i].classname);
- break;
- case t_Bool:
- *var_b = get_boolean_resource (dpy, xlockmore_opts->vars[i].name,
- xlockmore_opts->vars[i].classname);
- break;
- default:
- abort ();
- }
+ {
+ case t_String:
+ {
+ char *c = get_string_resource (dpy, xlockmore_opts->vars[i].name,
+ xlockmore_opts->vars[i].classname);
+ if ((!c && !*var_c) || (c && *var_c && !strcmp(c, *var_c))) {
+ free (c);
+ } else {
+ xlockmore_free_screens (mi);
+ free (*var_c);
+ *var_c = c;
+ }
+ }
+ break;
+ case t_Float:
+ {
+ float f = get_float_resource (dpy, xlockmore_opts->vars[i].name,
+ xlockmore_opts->vars[i].classname);
+ float frac = fabsf(*var_f) * (1.0f / (1l << (FLT_MANT_DIG - 4)));
+ if (f < *var_f - frac || f > *var_f + frac) {
+ xlockmore_free_screens (mi);
+ *var_f = f;
+ }
+ }
+ break;
+ case t_Int:
+ {
+ int ii = get_integer_resource (dpy, xlockmore_opts->vars[i].name,
+ xlockmore_opts->vars[i].classname);
+ if (ii != *var_i) {
+ xlockmore_free_screens (mi);
+ *var_i = ii;
+ }
+ }
+ break;
+ case t_Bool:
+ {
+ Bool b = get_boolean_resource (dpy, xlockmore_opts->vars[i].name,
+ xlockmore_opts->vars[i].classname);
+ if (b != *var_b) {
+ xlockmore_free_screens (mi);
+ *var_b = b;
+ }
+ }
+ break;
+ default:
+ abort ();
+ }
}
}
+/* We keep a list of all of the screen numbers that are in use and not
+ yet freed so that they can have sensible screen numbers. If three
+ displays are created (0, 1, 2) and then #1 is closed, then the fourth
+ display will be given the now-unused display number 1. (Everything in
+ here assumes a 1:1 Display/Screen mapping.)
+
+ XLOCKMORE_NUM_SCREENS is the most number of live displays at one time. So
+ if it's 64, then we'll blow up if the system has 64 monitors and also has
+ System Preferences open (the small preview window).
+
+ Note that xlockmore-style savers tend to allocate big structures, so
+ setting XLOCKMORE_NUM_SCREENS to 1000 will waste a few megabytes. Also
+ most (all?) of them assume that the number of screens never changes, so
+ dynamically expanding this array won't work.
+ */
+
+
static void *
xlockmore_init (Display *dpy, Window window,
struct xlockmore_function_table *xlmft)
mi->window = window;
XGetWindowAttributes (dpy, window, &mi->xgwa);
-#ifdef HAVE_JWXYZ
-
-# if 0
- /* In Cocoa and Android-based xscreensaver, all hacks run in the
- same address space, so each one needs to get its own screen
- number. Believe what jwxyz says about screen counts and numbers.
- */
- mi->num_screens = ScreenCount (dpy);
- mi->screen_number = XScreenNumberOfScreen (mi->xgwa.screen);
-# else
- /* No, that doesn't work.
- The xlockmore docs/HACKERS.GUIDE says that xlock modes are supposed to
- support repeated calls to init_*() for the same screen in the same
- session, but in practice, a number of them blow up if you do that.
- So instead we're stuck with a world where on OSX/iOS, we have to
- increment the screen number every time the hack is run. Arrgh.
- */
- mi->num_screens = 40;
- mi->screen_number = xlmft->screen_count;
- if (mi->screen_number >= mi->num_screens) abort();
- xlmft->screen_count++;
-# endif
- root_p = True;
+ /* In Cocoa and Android-based xscreensaver, as well as with DEBUG_PAIR,
+ hacks run in the same address space, so each one needs to get its own
+ screen number.
-#else /* real Xlib */
-
- /* In Xlib-based xscreensaver, each hack runs in its own address space,
- so each one only needs to be aware of one screen.
+ Find the first empty slot in live_displays and plug us in.
*/
- mi->num_screens = 1;
- mi->screen_number = 0;
-
- { /* kludge for DEBUG_PAIR */
- static int screen_tick = 0;
- mi->num_screens++;
- if (screen_tick)
- mi->screen_number++;
- screen_tick++;
+ {
+ const int size = XLOCKMORE_NUM_SCREENS;
+ int i;
+ for (i = 0; i < size; i++) {
+ if (! (xlmft->live_displays & (1 << i)))
+ break;
+ }
+ if (i >= size) abort();
+ xlmft->live_displays |= 1ul << i;
+ xlmft->got_init &= ~(1ul << i);
+ mi->screen_number = i;
}
root_p = (window == RootWindowOfScreen (mi->xgwa.screen));
+#ifndef HAVE_JWXYZ
+
/* Everybody gets motion events, just in case. */
XSelectInput (dpy, window, (mi->xgwa.your_event_mask | PointerMotionMask));
#endif /* !HAVE_JWXYZ */
-
+
+ if (mi->xlmft->hack_release) {
+/*
+ fprintf (
+ stderr,
+ "%s: WARNING: hack_release is not usually recommended; see MI_INIT.\n",
+ progname);
+*/
+ }
+
color.flags = DoRed|DoGreen|DoBlue;
color.red = color.green = color.blue = 0;
if (!XAllocColor(dpy, mi->xgwa.colormap, &color))
mi->wireframe_p = get_boolean_resource (dpy, "wireframe", "Boolean");
mi->root_p = root_p;
-#ifdef HAVE_XSHM_EXTENSION
- mi->use_shm = get_boolean_resource (dpy, "useSHM", "Boolean");
-#endif /* !HAVE_XSHM_EXTENSION */
mi->fps_p = get_boolean_resource (dpy, "doFPS", "DoFPS");
mi->recursion_depth = -1; /* see fps.c */
free (name);
}
}
-
+
xlockmore_read_resources (mi);
- XClearWindow (dpy, window);
-
- mi->xlmft->hack_init (mi);
-
return mi;
}
+static void xlockmore_do_init (ModeInfo *mi)
+{
+ if (! (mi->xlmft->got_init & (1 << mi->screen_number))) {
+ mi->xlmft->got_init |= 1 << mi->screen_number;
+ XClearWindow (mi->dpy, mi->window);
+ mi->xlmft->hack_init (mi);
+ }
+}
+
+
static unsigned long
xlockmore_draw (Display *dpy, Window window, void *closure)
{
ModeInfo *mi = (ModeInfo *) closure;
-
unsigned long orig_pause = mi->pause;
unsigned long this_pause;
+ xlockmore_do_init (mi);
mi->xlmft->hack_draw (mi);
this_pause = mi->pause;
if (mi && mi->xlmft->hack_reshape)
{
XGetWindowAttributes (dpy, window, &mi->xgwa);
+ xlockmore_do_init (mi);
mi->xlmft->hack_reshape (mi, mi->xgwa.width, mi->xgwa.height);
}
}
xlockmore_event (Display *dpy, Window window, void *closure, XEvent *event)
{
ModeInfo *mi = (ModeInfo *) closure;
- if (mi && mi->xlmft->hack_handle_events)
+ if (mi && mi->xlmft->hack_handle_events) {
+ xlockmore_do_init (mi);
return mi->xlmft->hack_handle_events (mi, event);
- else
+ } else {
return False;
+ }
}
void
static void
xlockmore_free (Display *dpy, Window window, void *closure)
{
- /* Most of the xlockmore/GL hacks don't have `free' functions, and of
- those that do have them, they're incomplete or buggy. So, fuck it.
- Under X11, we're about to exit anyway, and it doesn't matter.
- On OSX, we'll leak a little. Beats crashing.
- */
-#if 0
ModeInfo *mi = (ModeInfo *) closure;
- if (mi->xlmft->hack_free)
- mi->xlmft->hack_free (mi);
+
+ /* Find us in live_displays and clear that slot. */
+ assert (mi->xlmft->live_displays & (1ul << mi->screen_number));
+ mi->xlmft->live_displays &= ~(1ul << mi->screen_number);
+ if (!mi->xlmft->live_displays)
+ xlockmore_free_screens (mi);
XFreeGC (dpy, mi->gc);
- free_colors (dpy, mi->xgwa.colormap, mi->colors, mi->npixels);
+ free_colors (mi->xgwa.screen, mi->xgwa.colormap, mi->colors, mi->npixels);
free (mi->colors);
free (mi->pixels);
free (mi);
-#endif
}
+
+void
+xlockmore_mi_init (ModeInfo *mi, size_t state_size, void **state_array,
+ void (*hack_free_state) (ModeInfo *))
+{
+ struct xlockmore_function_table *xlmft = mi->xlmft;
+
+ /* Steal the state_array for safe keeping.
+ Only necessary when the screenhack isn't a once per process deal.
+ (i.e. macOS, iOS, Android)
+ */
+ assert ((!xlmft->state_array && !*state_array) ||
+ xlmft->state_array == state_array);
+ xlmft->state_array = state_array;
+ assert (!xlmft->state_size || xlmft->state_size == state_size);
+ xlmft->state_size = state_size;
+ assert (!xlmft->hack_free_state ||
+ xlmft->hack_free_state == hack_free_state);
+ xlmft->hack_free_state = hack_free_state;
+
+ if (!*xlmft->state_array) {
+ *xlmft->state_array = calloc (XLOCKMORE_NUM_SCREENS, state_size);
+
+ if (!*xlmft->state_array) {
+#ifdef HAVE_JWXYZ
+ /* Throws an exception instead of exiting the process. */
+ jwxyz_abort ("%s: out of memory", progname);
+#else
+ fprintf (stderr, "%s: out of memory\n", progname);
+ exit (1);
+#endif
+ }
+ }
+
+ /* Find the appropriate state object, clear it, and we're done. */
+ {
+ if (xlmft->hack_free_state)
+ xlmft->hack_free_state (mi);
+ memset ((char *)(*xlmft->state_array) + mi->screen_number * state_size, 0,
+ state_size);
+ }
+}
projects / xscreensaver / blobdiff