+++ /dev/null
-/* xscreensaver, Copyright (c) 1997, 1998 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.
- *
- * Concept snarfed from Michael D. Bayne in
- * http://www.go2net.com/internet/deep/1997/04/16/body.html
- */
-
-#include "screenhack.h"
-#include <X11/Xutil.h>
-#include <stdio.h>
-
-#ifdef HAVE_XSHM_EXTENSION
-# include "xshm.h"
-static Bool use_shm;
-static XShmSegmentInfo shm_info;
-#endif /* HAVE_XSHM_EXTENSION */
-
-static int offset = 0;
-static XColor *colors = 0;
-static int ncolors = 0;
-static GC gc = 0;
-static unsigned long fg_pixel = 0;
-static unsigned long bg_pixel = 0;
-
-static void
-init_moire (Display *dpy, Window window)
-{
- int oncolors;
- int i;
- int fgh, bgh;
- double fgs, fgv, bgs, bgv;
- XWindowAttributes xgwa;
- XColor fgc, bgc;
- XGCValues gcv;
- XGetWindowAttributes (dpy, window, &xgwa);
-
- offset = get_integer_resource ("offset", "Integer");
- if (offset < 2) offset = 2;
-
-#ifdef HAVE_XSHM_EXTENSION
- use_shm = get_boolean_resource("useSHM", "Boolean");
-#endif /* HAVE_XSHM_EXTENSION */
-
- MONO:
- if (colors)
- {
- for (i = 0; i < ncolors; i++)
- XFreeColors (dpy, xgwa.colormap, &colors[i].pixel, 1, 0);
- free(colors);
- colors = 0;
- }
-
- if (mono_p)
- {
- fg_pixel = WhitePixelOfScreen (DefaultScreenOfDisplay(dpy));
- bg_pixel = BlackPixelOfScreen (DefaultScreenOfDisplay(dpy));
- }
- else
- {
- fg_pixel = get_pixel_resource ("foreground", "Foreground", dpy,
- xgwa.colormap);
- bg_pixel = get_pixel_resource ("background", "Background", dpy,
- xgwa.colormap);
- }
-
- if (mono_p)
- {
- offset *= 20; /* compensate for lack of shading */
- gcv.foreground = fg_pixel;
- }
- else
- {
- ncolors = get_integer_resource ("ncolors", "Integer");
- if (ncolors < 2) ncolors = 2;
- oncolors = ncolors;
-
- fgc.flags = bgc.flags = DoRed|DoGreen|DoBlue;
- if (get_boolean_resource("random","Boolean"))
- {
- fgc.red = random() & 0xFFFF;
- fgc.green = random() & 0xFFFF;
- fgc.blue = random() & 0xFFFF;
- bgc.red = random() & 0xFFFF;
- bgc.green = random() & 0xFFFF;
- bgc.blue = random() & 0xFFFF;
- }
- else
- {
- fgc.pixel = fg_pixel;
- bgc.pixel = bg_pixel;
- XQueryColor (dpy, xgwa.colormap, &fgc);
- XQueryColor (dpy, xgwa.colormap, &bgc);
- }
- rgb_to_hsv (fgc.red, fgc.green, fgc.blue, &fgh, &fgs, &fgv);
- rgb_to_hsv (bgc.red, bgc.green, bgc.blue, &bgh, &bgs, &bgv);
-
- colors = (XColor *) malloc (sizeof (XColor) * (ncolors+2));
- memset(colors, 0, (sizeof (XColor) * (ncolors+2)));
- make_color_ramp (dpy, xgwa.colormap,
- fgh, fgs, fgv, bgh, bgs, bgv,
- colors, &ncolors,
- True, True, False);
- if (ncolors != oncolors)
- fprintf(stderr, "%s: got %d of %d requested colors.\n",
- progname, ncolors, oncolors);
-
- if (ncolors <= 2)
- {
- mono_p = True;
- goto MONO;
- }
-
- gcv.foreground = colors[0].pixel;
- }
- gc = XCreateGC (dpy, window, GCForeground, &gcv);
-}
-
-
-static void
-moire (Display *dpy, Window window, int offset, XColor *colors, int ncolors)
-{
- long x, y, xo, yo;
- int factor = (random() % offset) + 1;
- XGCValues gcv;
- XWindowAttributes xgwa;
- XImage *image;
- int depth;
- XGetWindowAttributes (dpy, window, &xgwa);
-
- xo = (random() % xgwa.width) - xgwa.width/2;
- yo = (random() % xgwa.height) - xgwa.height/2;
-
- depth = visual_depth(DefaultScreenOfDisplay(dpy), xgwa.visual);
-
- image = 0;
-# ifdef HAVE_XSHM_EXTENSION
- if (use_shm)
- {
- image = create_xshm_image(dpy, xgwa.visual, depth, ZPixmap, 0,
- &shm_info, xgwa.width, 1);
- if (!image)
- use_shm = False;
- }
-# endif /* HAVE_XSHM_EXTENSION */
-
- if (!image)
- {
- image = XCreateImage (dpy, xgwa.visual,
- depth, ZPixmap, 0, /* depth, format, offset */
- 0, xgwa.width, 1, 8, 0); /* data, w, h, pad, bpl */
- image->data = (char *) calloc(image->height, image->bytes_per_line);
- }
-
- for (y = 0; y < xgwa.height; y++)
- {
- for (x = 0; x < xgwa.width; x++)
- {
- double xx = x + xo;
- double yy = y + yo;
- double i = ((xx * xx) + (yy * yy)) / (double) factor;
- if (mono_p)
- gcv.foreground = ((((long) i) & 1) ? fg_pixel : bg_pixel);
- else
- gcv.foreground = colors[((long) i) % ncolors].pixel;
- XPutPixel (image, x, 0, gcv.foreground);
- }
-
-# ifdef HAVE_XSHM_EXTENSION
- if (use_shm)
- XShmPutImage(dpy, window, gc, image, 0, 0, 0, y, xgwa.width, 1, False);
- else
-# endif /* HAVE_XSHM_EXTENSION */
- XPutImage (dpy, window, gc, image, 0, 0, 0, y, xgwa.width, 1);
-
- XSync(dpy, False);
- }
-
-# ifdef HAVE_XSHM_EXTENSION
- if (!use_shm)
-# endif /* HAVE_XSHM_EXTENSION */
- if (image->data)
- {
- free(image->data);
- image->data = 0;
- }
-
- XDestroyImage (image);
-}
-
-\f
-char *progclass = "Moire";
-
-char *defaults [] = {
- ".background: blue",
- ".foreground: red",
- "*random: true",
- "*delay: 5",
- "*ncolors: 64",
- "*offset: 50",
-#ifdef HAVE_XSHM_EXTENSION
- "*useSHM: True",
-#endif /* HAVE_XSHM_EXTENSION */
- 0
-};
-
-XrmOptionDescRec options [] = {
- { "-random", ".random", XrmoptionSepArg, 0 },
- { "-delay", ".delay", XrmoptionSepArg, 0 },
- { "-ncolors", ".ncolors", XrmoptionSepArg, 0 },
- { "-offset", ".offset", XrmoptionSepArg, 0 },
-#ifdef HAVE_XSHM_EXTENSION
- { "-shm", ".useSHM", XrmoptionNoArg, "True" },
- { "-no-shm", ".useSHM", XrmoptionNoArg, "False" },
-#endif /* HAVE_XSHM_EXTENSION */
- { 0, 0, 0, 0 }
-};
-
-void
-screenhack (Display *dpy, Window window)
-{
- int delay = get_integer_resource ("delay", "Integer");
- while (1)
- {
- init_moire (dpy, window);
- moire (dpy, window, offset, colors, ncolors);
- XSync (dpy, False);
- screenhack_handle_events (dpy);
- if (delay)
- sleep(delay);
- }
-}
projects / xscreensaver / blobdiff