From ca2bce5efde0b5b296806df0c426f88d874eb530 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?IOhannes=20m=20zm=C3=B6lnig?=
 <zmoelnig@users.sourceforge.net>
Date: Mon, 13 Mar 2006 15:59:40 +0000
Subject: added the missing files from Gem's MarkEx

svn path=/trunk/externals/markex/; revision=4698
---
 rgb2hsv.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 rgb2hsv.c

(limited to 'rgb2hsv.c')

diff --git a/rgb2hsv.c b/rgb2hsv.c
new file mode 100644
index 0000000..9bc4f78
--- /dev/null
+++ b/rgb2hsv.c
@@ -0,0 +1,118 @@
+////////////////////////////////////////////////////////
+//
+// GEM - Graphics Environment for Multimedia
+//
+// mark@danks.org
+//
+//    Copyright (c) 1997-1999 Mark Danks.
+//    For information on usage and redistribution, and for a DISCLAIMER OF ALL
+//    WARRANTIES, see the file, "GEM.LICENSE.TERMS" in this distribution.
+//
+/////////////////////////////////////////////////////////
+
+#include "m_pd.h"
+#include <math.h>
+
+inline float FLOAT_CLAMP(float x) { return((x > 1.f) ? 1.f : ( (x < 0.f) ? 0.f : x)); }
+
+static inline float TRI_MAX(float v1, float v2, float v3)
+{ if (v1 > v2 && v1 > v3) return(v1);
+  if (v2 > v3) return(v2);
+  return(v3);
+}
+
+static inline float TRI_MIN(float v1, float v2, float v3)
+{ if (v1 < v2 && v1 < v3) return(v1);
+  if (v2 < v3) return(v2);
+  return(v3);
+}
+
+/////////////////////////////////////////////////////////
+//
+// rgb2hsv
+//
+/////////////////////////////////////////////////////////
+// instance structure
+static t_class *rgb2hsv_class;
+
+typedef struct _rgb2hsv
+{
+  t_object    x_obj;	        /* obligatory object header */
+  t_outlet    *t_out1;	    /* the outlet */
+}t_rgb2hsv;
+
+static void rgb2hsv_float(t_rgb2hsv *x, t_floatarg r, t_floatarg g, t_floatarg b)
+{
+  t_atom argv[3];
+
+  float h=0, s, v;
+
+  r = FLOAT_CLAMP(r);
+  g = FLOAT_CLAMP(g);
+  b = FLOAT_CLAMP(b);
+  float max = TRI_MAX(r, g, b);
+  float min = TRI_MIN(r, g, b);
+  v = max;		// the value
+
+  // calculate saturation
+  if (max != 0.0f)
+    s = (max - min) / max;
+  else
+    s = 0.0f;
+
+  if (s == 0.0f)
+    {
+      h = 0.0f;		// hue is undefined if no saturation	
+    }
+  // chromatic case - calculate hue
+  else
+    {
+      float delta = max - min;
+      if (r == max)						// between magenta and cyan
+        h = (g - b) / delta;
+      else if (g == max)					// between yellow and magenta
+        h = 2.0f + (b - r) / delta;
+      else if (b == max)					// between cyan and yellow
+        h = 4.0f + (r - g) / delta;
+
+      // convert hue to degrees
+      h *= 60.0f;
+      // make sure hue is nonnegative
+      if (h < 0.0)
+        h += 360.f;
+      // normalize hue
+      h /= 360.f;
+    }
+
+  SETFLOAT(&argv[0], h);
+  SETFLOAT(&argv[1], s);
+  SETFLOAT(&argv[2], v);
+
+  outlet_list(x->t_out1, &s_list, 3, argv);
+}
+
+static void rgb2hsv_list(t_rgb2hsv *x, t_symbol *s, int argc, t_atom *argv)
+{
+  if (argc >= 3)
+    {
+      float r = atom_getfloat(&argv[0]);
+      float g = atom_getfloat(&argv[1]);
+      float b = atom_getfloat(&argv[2]);
+      rgb2hsv_float(x, r, g, b);
+    }
+}
+
+static void *rgb2hsv_new(void)	// init vals in struct
+{
+  t_rgb2hsv *x = (t_rgb2hsv *)pd_new(rgb2hsv_class);
+  x->t_out1 = outlet_new(&x->x_obj, 0);
+  return (x);
+}
+
+void rgb2hsv_setup(void)
+{
+  rgb2hsv_class = class_new(gensym("rgb2hsv"), (t_newmethod)rgb2hsv_new, 0,
+                            sizeof(t_rgb2hsv), CLASS_DEFAULT, A_NULL);
+
+  class_addlist(rgb2hsv_class, (t_method)rgb2hsv_list);
+}
-- 
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