http://ftp.x.org/contrib/applications/xscreensaver-3.23.tar.gz

[xscreensaver] / hacks / deluxe.c

diff --git a/hacks/deluxe.c b/hacks/deluxe.c
index 739536e7f741683d0cb2892827d96150936ea5e5..0bbc84862aa8f856180864f932389c71772aaada 100644 (file)
--- a/hacks/deluxe.c
+++ b/hacks/deluxe.c
@@ -11,6 +11,7 @@
 
 #include <math.h>
 #include "screenhack.h"
+#include "alpha.h"
 
 #ifdef HAVE_DOUBLE_BUFFER_EXTENSION
 # include "xdbe.h"
@@ -19,6 +20,10 @@
 #define countof(x) (sizeof(x)/sizeof(*(x)))
 #define ABS(x) ((x)<0?-(x):(x))
 
+static Bool transparent_p;
+static int nplanes;
+static unsigned long base_pixel, *plane_masks;
+
 struct throbber {
   int x, y;
   int size;
@@ -120,6 +125,7 @@ static struct throbber *
 make_throbber (Display *dpy, Drawable d, int w, int h, unsigned long pixel)
 {
   XGCValues gcv;
+  unsigned long flags;
   struct throbber *t = (struct throbber *) malloc (sizeof (*t));
   t->x = w / 2;
   t->y = h / 2;
@@ -137,15 +143,25 @@ make_throbber (Display *dpy, Drawable d, int w, int h, unsigned long pixel)
   else
     t->size = t->thickness, t->speed = -t->speed;
 
-  gcv.foreground = pixel;
+  flags = GCForeground;
+  if (transparent_p)
+    {
+      gcv.foreground = ~0L;
+      gcv.plane_mask = base_pixel | plane_masks[random() % nplanes];
+      flags |= GCPlaneMask;
+    }
+  else
+    {
+      gcv.foreground = pixel;
+    }
+
   gcv.line_width = t->thickness;
   gcv.line_style = LineSolid;
   gcv.cap_style = CapProjecting;
   gcv.join_style = JoinMiter;
-  t->gc = XCreateGC (dpy, d,
-                     (GCForeground|GCLineWidth|GCLineStyle|
-                      GCCapStyle|GCJoinStyle),
-                     &gcv);
+
+  flags |= (GCLineWidth | GCLineStyle | GCCapStyle | GCJoinStyle);
+  t->gc = XCreateGC (dpy, d, flags, &gcv);
 
   switch (random() % 11) {
   case 0: case 1: case 2: case 3: t->draw = draw_star; break;
@@ -201,6 +217,8 @@ char *defaults [] = {
   "*thickness:         50",
   "*speed:             15",
   "*ncolors:           20",
+  "*nlayers:           0",
+  "*transparent:       False",
   "*doubleBuffer:      True",
 #ifdef HAVE_DOUBLE_BUFFER_EXTENSION
   "*useDBE:            True",
@@ -214,6 +232,8 @@ XrmOptionDescRec options [] = {
   { "-count",          ".count",       XrmoptionSepArg, 0 },
   { "-ncolors",                ".ncolors",     XrmoptionSepArg, 0 },
   { "-speed",          ".speed",       XrmoptionSepArg, 0 },
+  { "-transparent",    ".transparent",  XrmoptionNoArg,  "True" },
+  { "-opaque",         ".transparent",  XrmoptionNoArg,  "False" },
   { "-db",             ".doubleBuffer", XrmoptionNoArg,  "True" },
   { "-no-db",          ".doubleBuffer", XrmoptionNoArg,  "False" },
   { 0, 0, 0, 0 }
@@ -226,7 +246,7 @@ screenhack (Display *dpy, Window window)
   int delay = get_integer_resource ("delay", "Integer");
   int ncolors = get_integer_resource ("ncolors", "Integer");
   Bool dbuf = get_boolean_resource ("doubleBuffer", "Boolean");
-  XColor colors[255];
+  XColor *colors = 0;
   XGCValues gcv;
   GC erase_gc = 0;
   int i;
@@ -239,6 +259,10 @@ screenhack (Display *dpy, Window window)
 
   XGetWindowAttributes (dpy, window, &xgwa);
 
+  transparent_p = get_boolean_resource("transparent", "Transparent");
+
+  colors = (XColor *) calloc (sizeof(*colors), ncolors);
+
   if (get_boolean_resource("mono", "Boolean"))
     {
     MONO:
@@ -246,8 +270,27 @@ screenhack (Display *dpy, Window window)
       colors[0].pixel = get_pixel_resource("foreground", "Foreground",
                                            dpy, xgwa.colormap);
     }
+  else if (transparent_p)
+    {
+      nplanes = get_integer_resource ("planes", "Planes");
+      if (nplanes <= 0)
+        nplanes = (random() % (xgwa.depth-2)) + 2;
+
+      allocate_alpha_colors (xgwa.screen, xgwa.visual, xgwa.colormap,
+                             &nplanes, True, &plane_masks,
+                            &base_pixel);
+      if (nplanes <= 1)
+       {
+         fprintf (stderr,
+         "%s: couldn't allocate any color planes; turning transparency off.\n",
+                  progname);
+          transparent_p = False;
+         goto COLOR;
+       }
+    }
   else
     {
+    COLOR:
       make_random_colormap (dpy, xgwa.visual, xgwa.colormap,
                             colors, &ncolors, True, True, 0, True);
       if (ncolors < 2)