geometry: New dmnsn_clamp() function.

3 files changed, 12 insertions, 5 deletions

diff --git a/libdimension/dimension/color.h b/libdimension/dimension/color.h
index 1b21d94..adbd396 100644
--- a/libdimension/dimension/color.h
+++ b/libdimension/dimension/color.h
@@ -158,9 +158,9 @@ dmnsn_color_illuminate(dmnsn_color light, dmnsn_color color)
 DMNSN_INLINE dmnsn_color
 dmnsn_color_clamp(dmnsn_color color)
 {
-  color.R = dmnsn_min(dmnsn_max(color.R, 0.0), 1.0);
-  color.G = dmnsn_min(dmnsn_max(color.G, 0.0), 1.0);
-  color.B = dmnsn_min(dmnsn_max(color.B, 0.0), 1.0);
+  color.R = dmnsn_clamp(color.R, 0.0, 1.0);
+  color.G = dmnsn_clamp(color.G, 0.0, 1.0);
+  color.B = dmnsn_clamp(color.B, 0.0, 1.0);
   return color;
 }
 
diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h
index 7557680..811f591 100644
--- a/libdimension/dimension/geometry.h
+++ b/libdimension/dimension/geometry.h
@@ -120,6 +120,13 @@ dmnsn_max(double a, double b)
   return a > b ? a : b;
 }
 
+/** Clamp a value to an interval. */
+DMNSN_INLINE double
+dmnsn_clamp(double n, double min, double max)
+{
+  return dmnsn_min(dmnsn_max(n, min), max);
+}
+
 /** Convert degrees to radians. */
 DMNSN_INLINE double
 dmnsn_radians(double degrees)
diff --git a/libdimension/dimension/tcolor.h b/libdimension/dimension/tcolor.h
index f85fcd6..8c48800 100644
--- a/libdimension/dimension/tcolor.h
+++ b/libdimension/dimension/tcolor.h
@@ -94,8 +94,8 @@ DMNSN_INLINE dmnsn_tcolor
 dmnsn_tcolor_clamp(dmnsn_tcolor tcolor)
 {
   tcolor.c = dmnsn_color_clamp(tcolor.c);
-  tcolor.T = dmnsn_min(dmnsn_max(tcolor.T, 0.0), 1.0);
-  tcolor.F = dmnsn_min(dmnsn_max(tcolor.F, 0.0), 1.0);
+  tcolor.T = dmnsn_clamp(tcolor.T, 0.0, 1.0);
+  tcolor.F = dmnsn_clamp(tcolor.F, 0.0, 1.0);
   return tcolor;
 }