+++ /dev/null
-/* xscreensaver, Copyright (c) 1992-1997 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.
- */
-
-/* Rotate a bitmap using using bitblts.
- The bitmap must be square, and must be a power of 2 in size.
- This was translated from SmallTalk code which appeared in the
- August 1981 issue of Byte magazine.
-
- The input bitmap may be non-square, it is padded and centered
- with the background color. Another way would be to subdivide
- the bitmap into square components and rotate them independently
- (and preferably in parallel), but I don't think that would be as
- interesting looking.
-
- It's too bad almost nothing uses blitter hardware these days,
- or this might actually win.
- */
-
-#include "screenhack.h"
-#include <stdio.h>
-
-#ifdef HAVE_XPM
-# include <X11/xpm.h>
-# ifndef PIXEL_ALREADY_TYPEDEFED
-# define PIXEL_ALREADY_TYPEDEFED /* Sigh, Xmu/Drawing.h needs this... */
-# endif
-#endif
-
-#ifdef HAVE_XMU
-# ifndef VMS
-# include <X11/Xmu/Drawing.h>
-#else /* VMS */
-# include <Xmu/Drawing.h>
-# endif /* VMS */
-#endif
-
-#include "images/som.xbm"
-
-static Display *dpy;
-static Window window;
-static unsigned int size;
-static Pixmap self, temp, mask;
-static GC SET, CLR, CPY, IOR, AND, XOR;
-static GC gc;
-static int delay, delay2;
-static Pixmap bitmap;
-static int depth;
-static unsigned int fg, bg;
-
-static void display (Pixmap);
-
-#define copy_all_to(from, xoff, yoff, to, gc) \
- XCopyArea (dpy, (from), (to), (gc), 0, 0, \
- size-(xoff), size-(yoff), (xoff), (yoff))
-
-#define copy_all_from(to, xoff, yoff, from, gc) \
- XCopyArea (dpy, (from), (to), (gc), (xoff), (yoff), \
- size-(xoff), size-(yoff), 0, 0)
-
-static void
-rotate (void)
-{
- int qwad; /* fuckin' C, man... who needs namespaces? */
- XFillRectangle (dpy, mask, CLR, 0, 0, size, size);
- XFillRectangle (dpy, mask, SET, 0, 0, size>>1, size>>1);
- for (qwad = size>>1; qwad > 0; qwad>>=1)
- {
- if (delay) usleep (delay);
- copy_all_to (mask, 0, 0, temp, CPY); /* 1 */
- copy_all_to (mask, 0, qwad, temp, IOR); /* 2 */
- copy_all_to (self, 0, 0, temp, AND); /* 3 */
- copy_all_to (temp, 0, 0, self, XOR); /* 4 */
- copy_all_from (temp, qwad, 0, self, XOR); /* 5 */
- copy_all_from (self, qwad, 0, self, IOR); /* 6 */
- copy_all_to (temp, qwad, 0, self, XOR); /* 7 */
- copy_all_to (self, 0, 0, temp, CPY); /* 8 */
- copy_all_from (temp, qwad, qwad, self, XOR); /* 9 */
- copy_all_to (mask, 0, 0, temp, AND); /* A */
- copy_all_to (temp, 0, 0, self, XOR); /* B */
- copy_all_to (temp, qwad, qwad, self, XOR); /* C */
- copy_all_from (mask, qwad>>1, qwad>>1, mask, AND); /* D */
- copy_all_to (mask, qwad, 0, mask, IOR); /* E */
- copy_all_to (mask, 0, qwad, mask, IOR); /* F */
- display (self);
- }
-}
-
-static void
-read_bitmap (char *bitmap_name, int *widthP, int *heightP)
-{
-#ifdef HAVE_XPM
- XWindowAttributes xgwa;
- XpmAttributes xpmattrs;
- int result;
- xpmattrs.valuemask = 0;
- bitmap = 0;
-
- XGetWindowAttributes (dpy, window, &xgwa);
-
-# ifdef XpmCloseness
- xpmattrs.valuemask |= XpmCloseness;
- xpmattrs.closeness = 40000;
-# endif
-# ifdef XpmVisual
- xpmattrs.valuemask |= XpmVisual;
- xpmattrs.visual = xgwa.visual;
-# endif
-# ifdef XpmDepth
- xpmattrs.valuemask |= XpmDepth;
- xpmattrs.depth = xgwa.depth;
-# endif
-# ifdef XpmColormap
- xpmattrs.valuemask |= XpmColormap;
- xpmattrs.colormap = xgwa.colormap;
-# endif
-
- result = XpmReadFileToPixmap (dpy, window, bitmap_name, &bitmap, 0,
- &xpmattrs);
- switch (result)
- {
- case XpmColorError:
- fprintf (stderr, "%s: warning: xpm color substitution performed\n",
- progname);
- /* fall through */
- case XpmSuccess:
- *widthP = xpmattrs.width;
- *heightP = xpmattrs.height;
- break;
- case XpmFileInvalid:
- case XpmOpenFailed:
- bitmap = 0;
- break;
- case XpmColorFailed:
- fprintf (stderr, "%s: xpm: color allocation failed\n", progname);
- exit (-1);
- case XpmNoMemory:
- fprintf (stderr, "%s: xpm: out of memory\n", progname);
- exit (-1);
- default:
- fprintf (stderr, "%s: xpm: unknown error code %d\n", progname, result);
- exit (-1);
- }
- if (! bitmap)
-#endif
-
-#ifdef HAVE_XMU
- {
- int xh, yh;
- Pixmap b2;
- bitmap = XmuLocateBitmapFile (DefaultScreenOfDisplay (dpy), bitmap_name,
- 0, 0, widthP, heightP, &xh, &yh);
- if (! bitmap)
- {
- fprintf (stderr, "%s: couldn't find bitmap %s\n", progname,
- bitmap_name);
- exit (1);
- }
- b2 = XmuCreatePixmapFromBitmap (dpy, window, bitmap, *widthP, *heightP,
- depth, fg, bg);
- XFreePixmap (dpy, bitmap);
- bitmap = b2;
- }
-#else /* !XMU */
- {
- fprintf (stderr,
- "%s: your vendor doesn't ship the standard Xmu library.\n",
- progname);
- fprintf (stderr, "\tWe can't load XBM files without it.\n");
- exit (1);
- }
-#endif /* !XMU */
-}
-
-
-static Pixmap
-read_screen (Display *dpy, Window window, int *widthP, int *heightP)
-{
- Pixmap p;
- XWindowAttributes xgwa;
- XGCValues gcv;
- GC gc;
- XGetWindowAttributes (dpy, window, &xgwa);
- *widthP = xgwa.width;
- *heightP = xgwa.height;
-
- grab_screen_image(xgwa.screen, window);
- p = XCreatePixmap(dpy, window, *widthP, *heightP, xgwa.depth);
- gcv.function = GXcopy;
- gc = XCreateGC (dpy, window, GCFunction, &gcv);
- XCopyArea (dpy, window, p, gc, 0, 0, *widthP, *heightP, 0, 0);
-
- /* Reset the window's background color... */
- XSetWindowBackground (dpy, window,
- get_pixel_resource ("background", "Background",
- dpy, xgwa.colormap));
- XCopyArea (dpy, p, window, gc, 0, 0, *widthP, *heightP, 0, 0);
- XFreeGC (dpy, gc);
-
- return p;
-}
-
-
-static int
-to_pow2(int n, Bool up)
-{
- /* sizeof(Dimension) == 2. */
- int powers_of_2[] = { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024,
- 2048, 4096, 8192, 16384, 32768, 65536 };
- int i = 0;
- if (n > 65536) size = 65536;
- while (n >= powers_of_2[i]) i++;
- if (n == powers_of_2[i-1])
- return n;
- else
- return powers_of_2[up ? i : i-1];
-}
-
-static void
-init (void)
-{
- XWindowAttributes xgwa;
- Colormap cmap;
- XGCValues gcv;
- int width, height;
- char *bitmap_name;
- Bool scale_up;
-
- XGetWindowAttributes (dpy, window, &xgwa);
- cmap = xgwa.colormap;
- depth = xgwa.depth;
-
- fg = get_pixel_resource ("foreground", "Foreground", dpy, cmap);
- bg = get_pixel_resource ("background", "Background", dpy, cmap);
- delay = get_integer_resource ("delay", "Integer");
- delay2 = get_integer_resource ("delay2", "Integer");
- if (delay < 0) delay = 0;
- if (delay2 < 0) delay2 = 0;
- bitmap_name = get_string_resource ("bitmap", "Bitmap");
- if (! bitmap_name || !*bitmap_name)
- bitmap_name = "(default)";
-
- if (!strcmp (bitmap_name, "(default)"))
- {
- width = som_width;
- height = som_height;
- bitmap = XCreatePixmapFromBitmapData (dpy, window, (char *) som_bits,
- width, height, fg, bg, depth);
- scale_up = True; /* definitely. */
- }
- else if (!strcmp (bitmap_name, "(screen)"))
- {
- bitmap = read_screen (dpy, window, &width, &height);
- scale_up = True; /* maybe? */
- }
- else
- {
- read_bitmap (bitmap_name, &width, &height);
- scale_up = True; /* probably? */
- }
-
- size = (width < height) ? height : width; /* make it square */
- size = to_pow2(size, scale_up); /* round up to power of 2 */
- { /* don't exceed screen size */
- int s = XScreenNumberOfScreen(xgwa.screen);
- int w = to_pow2(XDisplayWidth(dpy, s), False);
- int h = to_pow2(XDisplayHeight(dpy, s), False);
- if (size > w) size = w;
- if (size > h) size = h;
- }
-
- self = XCreatePixmap (dpy, window, size, size, depth);
- temp = XCreatePixmap (dpy, window, size, size, depth);
- mask = XCreatePixmap (dpy, window, size, size, depth);
- gcv.foreground = (depth == 1 ? 1 : (~0));
- gcv.function=GXset; SET = XCreateGC(dpy,self,GCFunction|GCForeground,&gcv);
- gcv.function=GXclear;CLR = XCreateGC(dpy,self,GCFunction|GCForeground,&gcv);
- gcv.function=GXcopy; CPY = XCreateGC(dpy,self,GCFunction|GCForeground,&gcv);
- gcv.function=GXor; IOR = XCreateGC(dpy,self,GCFunction|GCForeground,&gcv);
- gcv.function=GXand; AND = XCreateGC(dpy,self,GCFunction|GCForeground,&gcv);
- gcv.function=GXxor; XOR = XCreateGC(dpy,self,GCFunction|GCForeground,&gcv);
-
- gcv.foreground = gcv.background = bg;
- gc = XCreateGC (dpy, window, GCForeground|GCBackground, &gcv);
- /* Clear self to the background color (not to 0, which CLR does.) */
- XFillRectangle (dpy, self, gc, 0, 0, size, size);
- XSetForeground (dpy, gc, fg);
-
- XCopyArea (dpy, bitmap, self, CPY, 0, 0, width, height,
- (size - width)>>1, (size - height)>>1);
- XFreePixmap(dpy, bitmap);
-
- display (self);
- XSync(dpy, False);
- screenhack_handle_events (dpy);
-}
-
-static void
-display (Pixmap pixmap)
-{
- XWindowAttributes xgwa;
- static int last_w = 0, last_h = 0;
- XGetWindowAttributes (dpy, window, &xgwa);
- if (xgwa.width != last_w || xgwa.height != last_h)
- {
- XClearWindow (dpy, window);
- last_w = xgwa.width;
- last_h = xgwa.height;
- }
-#ifdef HAVE_XPM
- if (depth != 1)
- XCopyArea (dpy, pixmap, window, gc, 0, 0, size, size,
- (xgwa.width-size)>>1, (xgwa.height-size)>>1);
- else
-#endif
- XCopyPlane (dpy, pixmap, window, gc, 0, 0, size, size,
- (xgwa.width-size)>>1, (xgwa.height-size)>>1, 1);
-/*
- XDrawRectangle (dpy, window, gc,
- ((xgwa.width-size)>>1)-1, ((xgwa.height-size)>>1)-1,
- size+2, size+2);
-*/
- XSync (dpy, False);
- screenhack_handle_events (dpy);
-}
-
-\f
-char *progclass = "BlitSpin";
-
-char *defaults [] = {
- ".background: black",
- ".foreground: white",
- "*delay: 500000",
- "*delay2: 500000",
- "*bitmap: (default)",
- "*geometry: 512x512",
- 0
-};
-
-XrmOptionDescRec options [] = {
- { "-delay", ".delay", XrmoptionSepArg, 0 },
- { "-delay2", ".delay2", XrmoptionSepArg, 0 },
- { "-bitmap", ".bitmap", XrmoptionSepArg, 0 },
- { "-grab-screen", ".bitmap", XrmoptionNoArg, "(screen)" },
- { 0, 0, 0, 0 }
-};
-
-void
-screenhack (Display *d, Window w)
-{
- dpy = d;
- window = w;
- init ();
- if (delay2) usleep (delay2 * 2);
- while (1)
- {
- rotate ();
- screenhack_handle_events (d);
- if (delay2) usleep (delay2);
- }
-}
projects / xscreensaver / blobdiff