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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2013-01-26 13:16:15 -0600
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2013-01-26 13:16:15 -0600
commit7e09b5c2efae58399621a938de26b9675b8ba621 (patch)
treede2c9535e1f4c48ae91910492d298eba1d593fd5 /tdescreensaver/xsavers/xs_hsv.c
parent159f7e147ac33c924b3ce9050c8f03cbc54916ee (diff)
downloadtdeartwork-7e09b5c2efae58399621a938de26b9675b8ba621.tar.gz
tdeartwork-7e09b5c2efae58399621a938de26b9675b8ba621.zip
Rename a number of libraries and executables to avoid conflicts with KDE4
Diffstat (limited to 'tdescreensaver/xsavers/xs_hsv.c')
-rw-r--r--tdescreensaver/xsavers/xs_hsv.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/tdescreensaver/xsavers/xs_hsv.c b/tdescreensaver/xsavers/xs_hsv.c
new file mode 100644
index 00000000..51385d00
--- /dev/null
+++ b/tdescreensaver/xsavers/xs_hsv.c
@@ -0,0 +1,81 @@
+/* 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.
+ */
+
+/* This file contains some utility routines for randomly picking the colors
+ to hack the screen with.
+ */
+
+/* #include "utils.h" */
+#include "xs_hsv.h"
+
+void
+hsv_to_rgb (int h, double s, double v,
+ unsigned short *r, unsigned short *g, unsigned short *b)
+{
+ 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;
+ f = H - i;
+ p1 = V * (1 - S);
+ p2 = V * (1 - (S * f));
+ p3 = V * (1 - (S * (1 - f)));
+ if (i == 0) { R = V; G = p3; B = p1; }
+ else if (i == 1) { R = p2; G = V; B = p1; }
+ else if (i == 2) { R = p1; G = V; B = p3; }
+ else if (i == 3) { R = p1; G = p2; B = V; }
+ else if (i == 4) { R = p3; G = p1; B = V; }
+ else { R = V; G = p1; B = p2; }
+ *r = R * 65535;
+ *g = G * 65535;
+ *b = B * 65535;
+}
+
+void
+rgb_to_hsv (unsigned short r, unsigned short g, unsigned short b,
+ int *h, double *s, double *v)
+{
+ double R, G, B, H, S, V;
+ double cmax, cmin;
+ double cmm;
+ int imax;
+ R = ((double) r) / 65535.0;
+ G = ((double) g) / 65535.0;
+ B = ((double) b) / 65535.0;
+ cmax = R; cmin = G; imax = 1;
+ if ( cmax < G ) { cmax = G; cmin = R; imax = 2; }
+ if ( cmax < B ) { cmax = B; imax = 3; }
+ if ( cmin > B ) { cmin = B; }
+ cmm = cmax - cmin;
+ V = cmax;
+ if (cmm == 0)
+ S = H = 0;
+ 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 (H < 0) H += 6.0;
+ }
+ *h = (H * 60.0);
+ *s = S;
+ *v = V;
+}