ftp://ftp.uni-heidelberg.de/pub/X11/contrib/applications/xscreensaver-2.07.tar.gz

[xscreensaver] / hacks / screenhack.h

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+/* xscreensaver, Copyright (c) 1992-1997 Jamie Zawinski <jwz@netscape.com>
+ *
+ * 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.
+ */
+
+/* Found in Don Hopkins' .plan file:
+ *
+ *   The color situation is a total flying circus.  The X approach to
+ *   device independence is to treat everything like a MicroVax framebuffer
+ *   on acid.  A truely portable X application is required to act like the
+ *   persistent customer in the Monty Python ``Cheese Shop'' sketch.  Even
+ *   the simplest applications must answer many difficult questions, like:
+ *
+ *   WHAT IS YOUR DISPLAY?
+ *       display = XOpenDisplay("unix:0");
+ *   WHAT IS YOUR ROOT?
+ *       root = RootWindow(display, DefaultScreen(display));
+ *   AND WHAT IS YOUR WINDOW?
+ *       win = XCreateSimpleWindow(display, root, 0, 0, 256, 256, 1,
+ *                                 BlackPixel(display, DefaultScreen(display)),
+ *                                 WhitePixel(display, DefaultScreen(display)))
+ *   OH ALL RIGHT, YOU CAN GO ON.
+ *
+ *   WHAT IS YOUR DISPLAY?
+ *         display = XOpenDisplay("unix:0");
+ *   WHAT IS YOUR COLORMAP?
+ *         cmap = DefaultColormap(display, DefaultScreen(display));
+ *   AND WHAT IS YOUR FAVORITE COLOR?
+ *         favorite_color = 0; / * Black. * /
+ *         / * Whoops! No, I mean: * /
+ *         favorite_color = BlackPixel(display, DefaultScreen(display));
+ *         / * AAAYYYYEEEEE!! (client dumps core & falls into the chasm) * /
+ *
+ *   WHAT IS YOUR DISPLAY?
+ *         display = XOpenDisplay("unix:0");
+ *   WHAT IS YOUR VISUAL?
+ *         struct XVisualInfo vinfo;
+ *         if (XMatchVisualInfo(display, DefaultScreen(display),
+ *                              8, PseudoColor, &vinfo) != 0)
+ *            visual = vinfo.visual;
+ *   AND WHAT IS THE NET SPEED VELOCITY OF AN XConfigureWindow REQUEST?
+ *         / * Is that a SubStructureRedirectMask or a ResizeRedirectMask? * /
+ *   WHAT?! HOW AM I SUPPOSED TO KNOW THAT?
+ *   AAAAUUUGGGHHH!!!! (server dumps core & falls into the chasm)
+ */
+
+#ifndef __SCREENHACK_H__
+#define __SCREENHACK_H__
+
+#include <stdlib.h>
+
+#include "config.h"
+
+#ifdef __hpux
+ /* Which of the ten billion standards does values.h belong to?
+    What systems always have it? */
+# include <values.h>
+#endif
+
+#include <stdio.h>
+
+#include <X11/Xlib.h>
+#include <X11/Xresource.h>
+#include <X11/Xos.h>
+
+/* M_PI ought to have been defined in math.h, but... */
+#ifndef M_PI
+# define M_PI 3.1415926535
+#endif
+
+#ifndef M_PI_2
+# define M_PI_2 1.5707963267
+#endif
+
+#include "yarandom.h"
+#include "usleep.h"
+#include "resources.h"
+#include "hsv.h"
+#include "colors.h"
+#include "grabscreen.h"
+#include "visual.h"
+
+extern Bool mono_p;
+extern char *progname;
+extern char *progclass;
+extern XrmDatabase db;
+extern XrmOptionDescRec options [];
+extern char *defaults [];
+
+extern void screenhack (Display*,Window);
+
+#endif /* __SCREENHACK_H__ */