http://apple.doit.wisc.edu/mirrors/amug/linux/linuxppc/sources/tarballs/xscreensaver...

[xscreensaver] / utils / hsv.c

diff --git a/utils/hsv.c b/utils/hsv.c
index c5109120af08a8f73f8936d17c83ac06e5bc50c9..cf1cc8d18e27462e229061e7c967002a75bf23fc 100644 (file)
--- a/utils/hsv.c
+++ b/utils/hsv.c
@@ -1,4 +1,4 @@
-/* xscreensaver, Copyright (c) 1992 Jamie Zawinski <jwz@netscape.com>
+/* 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
@@ -13,23 +13,23 @@
    to hack the screen with.
  */
 
-#include <X11/Xlib.h>
+#include "utils.h"
+#include "hsv.h"
 
 void
-#if __STDC__
 hsv_to_rgb (int h, double s, double v,
            unsigned short *r, unsigned short *g, unsigned short *b)
-#else
-hsv_to_rgb (h,s,v, r,g,b)
-     int h;                    /* 0 - 360   */
-     double s, v;              /* 0.0 - 1.0 */
-     unsigned short *r, *g, *b;        /* 0 - 65535 */
-#endif
 {
   double H, S, V, R, G, B;
   double p1, p2, p3;
   double f;
   int i;
+
+  if (s < 0) s = 0;
+  if (v < 0) v = 0;
+  if (s > 1) s = 1;
+  if (v > 1) v = 1;
+
   S = s; V = v;
   H = (h % 360) / 60.0;
   i = H;
@@ -49,15 +49,8 @@ hsv_to_rgb (h,s,v, r,g,b)
 }
 
 void
-#if __STDC__
 rgb_to_hsv (unsigned short r, unsigned short g, unsigned short b,
            int *h, double *s, double *v)
-#else
-rgb_to_hsv (r,g,b, h,s,v)
-     unsigned short r, g, b;   /* 0 - 65535 */
-     int *h;                   /* 0 - 360   */
-     double *s, *v;            /* 0.0 - 1.0 */
-#endif
 {
   double R, G, B, H, S, V;
   double cmax, cmin;
@@ -77,44 +70,12 @@ rgb_to_hsv (r,g,b, h,s,v)
   else
     {
       S = cmm / cmax;
-      if      (imax == 1) H =       (G - B) / cmm;
-      else if (imax == 2) H = 2.0 + (B - R) / cmm;
-      else if (imax == 3) H = 4.0 + (R - G) / cmm;
+      if       (imax == 1)    H =       (G - B) / cmm;
+      else  if (imax == 2)    H = 2.0 + (B - R) / cmm;
+      else /*if (imax == 3)*/ H = 4.0 + (R - G) / cmm;
       if (H < 0) H += 6.0;
     }
   *h = (H * 60.0);
   *s = S;
   *v = V;
 }
-
-
-void
-make_color_ramp (h1, s1, v1, h2, s2, v2,
-                pixels, npixels)
-     int h1, h2;                       /* 0 - 360   */
-     double s1, s2, v1, v2;            /* 0.0 - 1.0 */
-     XColor *pixels;
-     int npixels;
-{
-  int dh = (h2 - h1) / npixels;
-  double ds = (s2 - s1) / npixels;
-  double dv = (v2 - v1) / npixels;
-  int i;
-  for (i = 0; i < npixels; i++)
-    hsv_to_rgb ((h1 += dh), (s1 += ds), (v1 += dv),
-               &pixels [i].red, &pixels [i].green, &pixels [i].blue);
-}
-
-
-void
-cycle_hue (color, degrees)
-     XColor *color;
-     int degrees;
-{
-  int h;
-  double s, v;
-  rgb_to_hsv (color->red, color->green, color->blue,
-             &h, &s, &v);
-  h = (h + degrees) % 360;
-  hsv_to_rgb (h, s, v, &color->red, &color->green, &color->blue);
-}