From 858b98de510eb229a98a367ff7b7a52d7d606fb0 Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@lemstra.org>
Date: Tue, 20 Aug 2019 20:17:10 +0200
Subject: [PATCH] Use switch to improve readability.

---
 coders/png.c | 52 ++++++++++++++++++++++++++++------------------------
 1 file changed, 28 insertions(+), 24 deletions(-)

diff --git a/coders/png.c b/coders/png.c
index de0e86091..0c04598bd 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -12523,31 +12523,35 @@ static MagickBooleanType WritePNGImage(const ImageInfo *image_info,
 
   for (source=0; source<8; source++)
   {
-    value = NULL;
+    value = (const char *) NULL;
 
-    if (source == 0)
-      value=GetImageOption(image_info,"png:exclude-chunks");
-
-    if (source == 1)
-      value=GetImageArtifact(image,"png:exclude-chunks");
-
-    if (source == 2)
-      value=GetImageOption(image_info,"png:exclude-chunk");
-
-    if (source == 3)
-      value=GetImageArtifact(image,"png:exclude-chunk");
-
-    if (source == 4)
-      value=GetImageOption(image_info,"png:include-chunks");
-
-    if (source == 5)
-      value=GetImageArtifact(image,"png:include-chunks");
-
-    if (source == 6)
-      value=GetImageOption(image_info,"png:include-chunk");
-
-    if (source == 7)
-      value=GetImageArtifact(image,"png:include-chunk");
+    switch(source)
+    {
+      case 0:
+        value=GetImageOption(image_info,"png:exclude-chunks");
+        break;
+      case 1:
+        value=GetImageArtifact(image,"png:exclude-chunks");
+        break;
+      case 2:
+        value=GetImageOption(image_info,"png:exclude-chunk");
+        break;
+      case 3:
+        value=GetImageArtifact(image,"png:exclude-chunk");
+        break;
+      case 4:
+        value=GetImageOption(image_info,"png:include-chunks");
+        break;
+      case 5:
+        value=GetImageArtifact(image,"png:include-chunks");
+        break;
+      case 6:
+        value=GetImageOption(image_info,"png:include-chunk");
+        break;
+      case 7:
+        value=GetImageArtifact(image,"png:include-chunk");
+        break;
+    }
 
     if (value == NULL)
        continue;
-- 
2.40.0