ftp://ftp.sunet.se/pub/vendor/sco/skunkware/osr5/x11/savers/xscreensaver/xscreensaver...

[xscreensaver] / utils / alpha.c

diff --git a/utils/alpha.c b/utils/alpha.c
deleted file mode 100644 (file)
index 1812cab..0000000
--- a/utils/alpha.c
+++ /dev/null
@@ -1,177 +0,0 @@
-/* xscreensaver, Copyright (c) 1992, 1995, 1996, 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.
- */
-
-/* Beauty is only skin deep, unless you've got an alpha channel. */
-
-
-#include "utils.h"
-#include "alpha.h"
-#include "hsv.h"
-#include "yarandom.h"
-#include "resources.h"
-
-#ifndef countof
-# define countof(x) (sizeof(*(x))/sizeof((x)))
-#endif
-
-
-/* I don't believe this fucking language doesn't have builtin exponentiation.
-   I further can't believe that the fucking ^ character means fucking XOR!! */
-static int 
-i_exp (int i, int j)
-{
-  int k = 1;
-  while (j--) k *= i;
-  return k;
-}
-
-
-static void
-merge_colors (int argc, XColor **argv, XColor *into_color, int mask,
-             Bool additive_p)
-{
-  int j;
-  *into_color = *argv [0];
-  into_color->pixel |= mask;
-
-  for (j = 1; j < argc; j++)
-    {
-# define SHORT_INC(x,y) (x = ((((x)+(y)) > 0xFFFF) ? 0xFFFF : ((x)+(y))))
-# define SHORT_DEC(x,y) (x = ((((x)-(y)) < 0)      ? 0      : ((x)-(y))))
-      if (additive_p)
-       {
-         SHORT_INC (into_color->red,   argv[j]->red);
-         SHORT_INC (into_color->green, argv[j]->green);
-         SHORT_INC (into_color->blue,  argv[j]->blue);
-       }
-      else
-       {
-         SHORT_DEC (into_color->red,   argv[j]->red);
-         SHORT_DEC (into_color->green, argv[j]->green);
-         SHORT_DEC (into_color->blue,  argv[j]->blue);
-       }
-# undef SHORT_INC
-# undef SHORT_DEC
-    }
-}
-
-static void
-permute_colors (XColor *pcolors, XColor *colors,
-               int count,
-               unsigned long *plane_masks,
-               Bool additive_p)
-{
-  int out = 0;
-  int max = i_exp (2, count);
-  if (count > 31) abort ();
-  for (out = 1; out < max; out++)
-    {
-      XColor *argv [32];
-      int this_mask = 0;
-      int argc = 0;
-      int bit;
-      for (bit = 0; bit < 32; bit++)
-       if (out & (1<<bit))
-         {
-           argv [argc++] = &pcolors [bit];
-           this_mask |= plane_masks [bit];
-         }
-      merge_colors (argc, argv, &colors [out-1], this_mask, additive_p);
-    }
-}
-
-
-int
-allocate_color_planes (Display *dpy, Colormap cmap,
-                      int nplanes, unsigned long *plane_masks,
-                      unsigned long *base_pixel_ret)
-{
-  while (nplanes > 1 &&
-        !XAllocColorCells (dpy, cmap, False, plane_masks, nplanes,
-                           base_pixel_ret, 1))
-    nplanes--;
-
-  return nplanes;
-}
-                      
-
-void
-initialize_transparency_colormap (Display *dpy, Colormap cmap,
-                                 int nplanes,
-                                 unsigned long base_pixel,
-                                 unsigned long *plane_masks,
-                                 XColor *colors,
-                                 Bool additive_p)
-{
-  int i;
-  int total_colors = i_exp (2, nplanes);
-  XColor *all_colors = (XColor *) calloc (total_colors, sizeof (XColor));
-
-  for (i = 0; i < nplanes; i++)
-    colors[i].pixel = base_pixel | plane_masks [i];
-  permute_colors (colors, all_colors, nplanes, plane_masks, additive_p);
-
-  /* clone the default background of the window into our "base" pixel */
-  all_colors [total_colors - 1].pixel =
-    get_pixel_resource ("background", "Background", dpy, cmap);
-  XQueryColor (dpy, cmap, &all_colors [total_colors - 1]);
-  all_colors [total_colors - 1].pixel = base_pixel;
-
-  for (i = 0; i < total_colors; i++)
-    all_colors[i].flags = DoRed|DoGreen|DoBlue;
-  XStoreColors (dpy, cmap, all_colors, total_colors);
-  XFree ((XPointer) all_colors);
-}
-
-
-Bool
-allocate_alpha_colors (Display *dpy, Colormap cmap,
-                      int *nplanesP, Bool additive_p,
-                      unsigned long **plane_masks,
-                      unsigned long *base_pixelP)
-{
-  XColor *colors;
-  int nplanes = *nplanesP;
-  int i;
-
-  if (nplanes > 31) nplanes = 31;
-  *plane_masks = (unsigned long *) malloc(sizeof(unsigned long) * nplanes);
-
-  nplanes = allocate_color_planes (dpy, cmap, nplanes, *plane_masks,
-                                  base_pixelP);
-  *nplanesP = nplanes;
-
-  if (nplanes <= 1)
-    {
-      free(*plane_masks);
-      *plane_masks = 0;
-      return False;
-    }
-
-  colors = (XColor *) calloc (nplanes, sizeof (XColor));
-  for (i = 0; i < nplanes; i++)
-    {
-      /* pick the base colors. If we are in subtractive mode, pick higher
-        intensities. */
-      hsv_to_rgb (random () % 360,
-                 frand (1.0),
-                 frand (0.5) + (additive_p ? 0.2 : 0.5),
-                 &colors[i].red,
-                 &colors[i].green,
-                 &colors[i].blue);
-    }
-  initialize_transparency_colormap (dpy, cmap, nplanes,
-                                   *base_pixelP, *plane_masks, colors,
-                                   additive_p);
-  XFree ((XPointer) colors);
-  return True;
-}