1 files changed, 71 insertions, 0 deletions
diff --git a/mypaint/lib/helpers2.hpp b/mypaint/lib/helpers2.hpp
new file mode 100644
index 0000000..d941933
--- /dev/null
+++ b/mypaint/lib/helpers2.hpp
@@ -0,0 +1,71 @@
+// Special HSV -> RGB converter for use with the color selector classes
+// Takes values in the range [ 0.0 , 1.0 ]
+// Gives values in the range [ 0.0 , 255.0 ]
+void hsv_to_rgb_range_one(float *h_, float *s_, float *v_)
+{
+  gint i;
+  gdouble f, w, q, t;
+  float h, s, v;
+  float r, g, b;
+  r = g = b = 0.0; // silence gcc warning
+
+  h = *h_;
+  s = *s_;
+  v = *v_;
+
+  h = h - floor(h);
+  s = CLAMP(s, 0.0, 1.0);
+  v = CLAMP(v, 0.0, 1.0);
+
+  gdouble hue = h;
+
+  if( hue == 1.0 )
+    hue = 0.0;
+  else
+    hue *= 6.0;
+
+  i = (gint) hue;
+  f = hue - i;
+  w = v * (1.0 - s);
+  q = v * (1.0 - (s * f));
+  t = v * (1.0 - (s * (1.0 - f)));
+
+  switch (i)
+    {
+    case 0:
+      r = v;
+      g = t;
+      b = w;
+      break;
+    case 1:
+      r = q;
+      g = v;
+      b = w;
+      break;
+    case 2:
+      r = w;
+      g = v;
+      b = t;
+      break;
+    case 3:
+      r = w;
+      g = q;
+      b = v;
+      break;
+    case 4:
+      r = t;
+      g = w;
+      b = v;
+      break;
+    case 5:
+      r = v;
+      g = w;
+      b = q;
+      break;
+    }
+
+  *h_ = r*255.0f;
+  *s_ = g*255.0f;
+  *v_ = b*255.0f;
+}
+