http://www.tienza.es/crux/src/www.jwz.org/xscreensaver/xscreensaver-5.05.tar.gz

[xscreensaver] / hacks / lcdscrub.c

diff --git a/hacks/lcdscrub.c b/hacks/lcdscrub.c
new file mode 100644 (file)
index 0000000..700de61
--- /dev/null
+++ b/hacks/lcdscrub.c
@@ -0,0 +1,158 @@
+/* xscreensaver, Copyright (c) 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
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ *
+ * Draws repetitive patterns that should undo burned in LCD screens.
+ * Concept shamelessly cloned from
+ * http://toastycode.com/blog/2008/02/05/lcd-scrub/
+ */
+
+#include "screenhack.h"
+
+struct state {
+  Display *dpy;
+  Window window;
+  XWindowAttributes xgwa;
+  enum { HORIZ_W, HORIZ_B, 
+         VERT_W, VERT_B, 
+         DIAG_W, DIAG_B, 
+         WHITE, BLACK,
+         END } mode;
+  int count;
+  GC fg, bg;
+  int delay;
+  int spread;
+  int cycles;
+};
+
+
+static void *
+lcdscrub_init (Display *dpy, Window window)
+{
+  struct state *st = (struct state *) calloc (1, sizeof(*st));
+  XGCValues gcv;
+  st->dpy = dpy;
+  st->window = window;
+  st->delay  = get_integer_resource (st->dpy, "delay",  "Integer");
+  st->spread = get_integer_resource (st->dpy, "spread", "Integer");
+  st->cycles = get_integer_resource (st->dpy, "cycles", "Integer");
+
+  XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
+  gcv.foreground = BlackPixelOfScreen (st->xgwa.screen);
+  gcv.background = WhitePixelOfScreen (st->xgwa.screen);
+  st->bg = XCreateGC (st->dpy, st->window, GCForeground, &gcv);
+  gcv.foreground = WhitePixelOfScreen (st->xgwa.screen);
+  gcv.background = BlackPixelOfScreen (st->xgwa.screen);
+  st->fg = XCreateGC (st->dpy, st->window, GCForeground, &gcv);
+
+#ifdef HAVE_COCOA
+  jwxyz_XSetAntiAliasing (st->dpy, st->fg, False);
+  jwxyz_XSetAntiAliasing (st->dpy, st->bg, False);
+#endif
+
+  return st;
+}
+
+static unsigned long
+lcdscrub_draw (Display *dpy, Window window, void *closure)
+{
+  struct state *st = (struct state *) closure;
+  int count = st->count % st->spread;
+  int i;
+  GC fg = (st->mode & 1 ? st->fg : st->bg);
+  GC bg = (st->mode & 1 ? st->bg : st->fg);
+
+  switch (st->mode) {
+  case HORIZ_W:
+  case HORIZ_B:
+    XFillRectangle (st->dpy, st->window, bg, 0, 0,
+                    st->xgwa.width, st->xgwa.height);
+    for (i = count; i < st->xgwa.height; i += st->spread)
+      XDrawLine (st->dpy, st->window, fg, 0, i, st->xgwa.width, i);
+    break;
+  case VERT_W:
+  case VERT_B:
+    XFillRectangle (st->dpy, st->window, bg, 0, 0,
+                    st->xgwa.width, st->xgwa.height);
+    for (i = count; i < st->xgwa.width; i += st->spread)
+      XDrawLine (st->dpy, st->window, fg, i, 0, i, st->xgwa.height);
+    break;
+  case DIAG_W:
+  case DIAG_B:
+    XFillRectangle (st->dpy, st->window, bg, 0, 0,
+                    st->xgwa.width, st->xgwa.height);
+    for (i = count; i < st->xgwa.width; i += st->spread)
+      XDrawLine (st->dpy, st->window, fg, i, 0, 
+                 i + st->xgwa.width, st->xgwa.width);
+    for (i = -count; i < st->xgwa.height; i += st->spread)
+      XDrawLine (st->dpy, st->window, fg, 0, i,
+                 st->xgwa.height, i + st->xgwa.height);
+    break;
+  case WHITE:
+  case BLACK:
+    XFillRectangle (st->dpy, st->window, fg, 0, 0,
+                    st->xgwa.width, st->xgwa.height);
+    break;
+  default: 
+    abort(); 
+    break;
+  }
+
+  st->count++;
+
+  if (st->count > st->spread * st->cycles)
+    {
+      st->count = 0;
+      if (++st->mode == END)
+        st->mode = 0;
+    }
+
+  return st->delay;
+}
+
+static void
+lcdscrub_reshape (Display *dpy, Window window, void *closure, 
+                 unsigned int w, unsigned int h)
+{
+}
+
+static Bool
+lcdscrub_event (Display *dpy, Window window, void *closure, XEvent *event)
+{
+  return False;
+}
+
+static void
+lcdscrub_free (Display *dpy, Window window, void *closure)
+{
+  struct state *st = (struct state *) closure;
+  XFreeGC (dpy, st->fg);
+  XFreeGC (dpy, st->bg);
+  free (st);
+}
+
+
+static const char *lcdscrub_defaults [] = {
+  ".background:                black",
+  ".foreground:                white",
+  "*delay:             100000",
+  "*spread:            8",
+  "*cycles:            60",
+  0
+};
+
+static XrmOptionDescRec lcdscrub_options [] = {
+  { "-delay",          ".delay",       XrmoptionSepArg, 0 },
+  { "-spread",         ".spread",      XrmoptionSepArg, 0 },
+  { "-cycles",         ".cycles",      XrmoptionSepArg, 0 },
+  { 0, 0, 0, 0 }
+};
+
+
+XSCREENSAVER_MODULE ("LCDscrub", lcdscrub)