From ecd58e8ec703be7d48d44cf1a97ee840822148bd Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Tue, 15 Aug 2017 14:31:56 -0400
Subject: [PATCH] 
 https://www.imagemagick.org/discourse-server/viewtopic.php?f=2&t=32506

---
 MagickCore/option.c   |  4 +--
 MagickCore/resample.h |  4 +--
 MagickCore/resize.c   | 63 +++++++++++++++++++------------------------
 3 files changed, 29 insertions(+), 42 deletions(-)

diff --git a/MagickCore/option.c b/MagickCore/option.c
index b36f69468..e3bd97ec5 100644
--- a/MagickCore/option.c
+++ b/MagickCore/option.c
@@ -1164,9 +1164,7 @@ static const OptionInfo
     { "Sinc", SincFilter, UndefinedOptionFlag, MagickFalse },
     { "SincFast", SincFastFilter, UndefinedOptionFlag, MagickFalse },
     { "Spline", SplineFilter, UndefinedOptionFlag, MagickFalse },
-    { "Spline16", Spline16Filter, UndefinedOptionFlag, MagickFalse },
-    { "Spline36", Spline36Filter, UndefinedOptionFlag, MagickFalse },
-    { "Spline64", Spline64Filter, UndefinedOptionFlag, MagickFalse },
+    { "SplineLobes", SplineLobesFilter, UndefinedOptionFlag, MagickFalse },
     { "Triangle", TriangleFilter, UndefinedOptionFlag, MagickFalse },
     { "Welch", WelchFilter, UndefinedOptionFlag, MagickFalse },
     { "Welsh", WelchFilter, UndefinedOptionFlag, MagickTrue }, /*misspell*/
diff --git a/MagickCore/resample.h b/MagickCore/resample.h
index e7461f50d..6fdbc532e 100644
--- a/MagickCore/resample.h
+++ b/MagickCore/resample.h
@@ -62,9 +62,7 @@ typedef enum
   CosineFilter,
   SplineFilter,
   LanczosRadiusFilter,
-  Spline16Filter,
-  Spline36Filter,
-  Spline64Filter,
+  SplineLobesFilter,
   SentinelFilter  /* a count of all the filters, not a real filter */
 } FilterType;
 
diff --git a/MagickCore/resize.c b/MagickCore/resize.c
index 1441324d9..c51c46ac3 100644
--- a/MagickCore/resize.c
+++ b/MagickCore/resize.c
@@ -500,37 +500,32 @@ static double SincFast(const double x,
   }
 }
 
-static double Spline16(const double x,
-  const ResizeFilter *magick_unused(resize_filter))
-{
-  /*
-    2-lobe Spline filter.
-  */
-  if (x < 1.0)
-    return(((x-9.0/5.0)*x-1.0/5.0)*x+1.0);
-  if (x < 2.0)
-    return(((-1.0/3.0*(x-1.0)+4.0/5.0)*(x-1.0)-7.0/15.0)*(x-1.0));
-  return(0.0);
-}
-
-static double Spline36(const double x,
-  const ResizeFilter *magick_unused(resize_filter))
-{
-  /*
-    3-lobe Spline filter.
-  */
-  if (x < 1.0)
-    return(((13.0/11.0*x-453.0/209.0)*x-3.0/209.0)*x+1.0);
-  if (x < 2.0)
-    return(((-6.0/11.0*(x-1.0)+270.0/209.0)*(x-1.0)-156.0/209.0)*(x-1.0));
-  if (x < 3.0)
-    return(((1.0/11.0*(x-2.0)-45.0/209.0)*(x-2.0)+26.0/209.0)*(x-2.0));
-  return(0.0);
-}
-
-static double Spline64(const double x,
-  const ResizeFilter *magick_unused(resize_filter))
+static double SplineLobes(const double x,const ResizeFilter *resize_filter)
 {
+  if (resize_filter->support <= 2.0)
+    {
+      /*
+        2-lobe Spline filter.
+      */
+      if (x < 1.0)
+        return(((x-9.0/5.0)*x-1.0/5.0)*x+1.0);
+      if (x < 2.0)
+        return(((-1.0/3.0*(x-1.0)+4.0/5.0)*(x-1.0)-7.0/15.0)*(x-1.0));
+      return(0.0);
+    }
+  if (resize_filter->support <= 3.0)
+    {
+      /*
+        3-lobe Spline filter.
+      */
+      if (x < 1.0)
+        return(((13.0/11.0*x-453.0/209.0)*x-3.0/209.0)*x+1.0);
+      if (x < 2.0)
+        return(((-6.0/11.0*(x-1.0)+270.0/209.0)*(x-1.0)-156.0/209.0)*(x-1.0));
+      if (x < 3.0)
+        return(((1.0/11.0*(x-2.0)-45.0/209.0)*(x-2.0)+26.0/209.0)*(x-2.0));
+      return(0.0);
+    }
   /*
     4-lobe Spline filter.
   */
@@ -829,9 +824,7 @@ MagickPrivate ResizeFilter *AcquireResizeFilter(const Image *image,
     { LanczosFilter,       CosineFilter   },  /* Cosine window (3 lobes)      */
     { SplineFilter,        BoxFilter      },  /* Spline Cubic Filter          */
     { LanczosRadiusFilter, LanczosFilter  },  /* Lanczos with integer radius  */
-    { Spline16Filter,      BoxFilter      },  /* Spline 16 (2 lobes)  */
-    { Spline36Filter,      BoxFilter      },  /* Spline 36 (3 lobes)  */
-    { Spline64Filter,      BoxFilter      },  /* Spline 64 (4 lobes)  */
+    { SplineLobesFilter,   BoxFilter      },  /* SplineLobes (n lobes)  */
   };
   /*
     Table mapping the filter/window from the above table to an actual function.
@@ -895,9 +888,7 @@ MagickPrivate ResizeFilter *AcquireResizeFilter(const Image *image,
     { Cosine,    1.0, 1.0, 0.0, 0.0, CosineWeightingFunction },   /* Low level cosine window     */
     { CubicBC,   2.0, 2.0, 1.0, 0.0, CubicBCWeightingFunction },  /* Cubic B-Spline (B=1,C=0)    */
     { SincFast,  3.0, 1.0, 0.0, 0.0, SincFastWeightingFunction }, /* Lanczos, Interger Radius    */
-    { Spline16,  2.0, 0.5, 1.0, 0.0, BoxWeightingFunction },  /* Spline 16 2-lobed */
-    { Spline36,  3.0, 0.5, 1.0, 0.0, BoxWeightingFunction },  /* Spline 36 3-lobed */
-    { Spline64,  4.0, 0.5, 1.0, 0.0, BoxWeightingFunction },  /* Spline 64 4-lobed */
+    { SplineLobes,  2.0, 0.5, 1.0, 0.0, BoxWeightingFunction },  /* Spline Lobes 2-lobed */
   };
   /*
     The known zero crossings of the Jinc() or more accurately the Jinc(x*PI)
-- 
2.40.0