From 19f7886e4423cd5ce3eef31092942f55ba770983 Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Sat, 5 Oct 2013 22:21:46 +0000
Subject: [PATCH]

---
 MagickCore/fourier.c | 18 ++++++++++++++++++
 MagickCore/fourier.h |  4 +++-
 MagickCore/option.c  |  2 ++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/MagickCore/fourier.c b/MagickCore/fourier.c
index 6d77c7f8e..640437688 100644
--- a/MagickCore/fourier.c
+++ b/MagickCore/fourier.c
@@ -249,6 +249,12 @@ MagickExport Image *ComplexImages(const Image *images,
       {
         switch (operator)
         {
+          case AddComplexOperator:
+          {
+            Cr[i]=Ar[i]+Br[i];
+            Ci[i]=Ai[i]+Bi[i];
+            break;
+          }
           case ConjugateComplexOperator:
           default:
           {
@@ -272,7 +278,19 @@ MagickExport Image *ComplexImages(const Image *images,
             Ci[i]=(Ai[i]*Br[i]-Ai[i]*Bi[i]);
             break;
           }
+          case SubtractComplexOperator:
+          {
+            Cr[i]=Ar[i]-Br[i];
+            Ci[i]=Ai[i]-Bi[i];
+            break;
+          }
         }
+        Ar+=GetPixelChannels(Ar_image);
+        Ai+=GetPixelChannels(Ai_image);
+        Br+=GetPixelChannels(Br_image);
+        Bi+=GetPixelChannels(Bi_image);
+        Cr+=GetPixelChannels(Cr_image);
+        Ci+=GetPixelChannels(Ci_image);
       }
     }
     if (SyncCacheViewAuthenticPixels(Ci_view,exception) == MagickFalse)
diff --git a/MagickCore/fourier.h b/MagickCore/fourier.h
index c74180aee..e0cca4fdd 100644
--- a/MagickCore/fourier.h
+++ b/MagickCore/fourier.h
@@ -25,9 +25,11 @@ extern "C" {
 typedef enum
 {
   UndefinedComplexOperator,
+  AddComplexOperator,
   ConjugateComplexOperator,
   DivideComplexOperator,
-  MultiplyComplexOperator
+  MultiplyComplexOperator,
+  SubtractComplexOperator
 } ComplexOperator;
 
 extern MagickExport Image
diff --git a/MagickCore/option.c b/MagickCore/option.c
index 949545f9d..23987077d 100644
--- a/MagickCore/option.c
+++ b/MagickCore/option.c
@@ -923,9 +923,11 @@ static const OptionInfo
   ComplexOptions[] =
   {
     { "Undefined", UndefinedComplexOperator, UndefinedOptionFlag, MagickTrue },
+    { "Add", AddComplexOperator, UndefinedOptionFlag, MagickFalse },
     { "Conjugate", ConjugateComplexOperator, UndefinedOptionFlag, MagickFalse },
     { "Divide", DivideComplexOperator, UndefinedOptionFlag, MagickFalse },
     { "Multiply", MultiplyComplexOperator, UndefinedOptionFlag, MagickFalse },
+    { "Subtract", SubtractComplexOperator, UndefinedOptionFlag, MagickFalse },
     { (char *) NULL, UndefinedComplexOperator, UndefinedOptionFlag, MagickFalse }
   },
   DataTypeOptions[] =
-- 
2.40.0