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authorgiraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8>2016-09-28 01:32:12 +0000
committergiraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8>2016-09-28 01:32:12 +0000
commit74972256fffd43d1f1e16f0d4bc373e93aaed444 (patch)
treef55b20f29a2ae848261924a8582444c4a4356be9 /converter/other/pngx.h
parenta8b009ef04ee1689c6cb60c1453c8196a00eaeba (diff)
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Copy Development as new Advanced
git-svn-id: http://svn.code.sf.net/p/netpbm/code/advanced@2830 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'converter/other/pngx.h')
-rw-r--r--converter/other/pngx.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/converter/other/pngx.h b/converter/other/pngx.h
index cabb0663..008081eb 100644
--- a/converter/other/pngx.h
+++ b/converter/other/pngx.h
@@ -2,6 +2,10 @@
 #define PNGX_H_INCLUDED
 
 #include <png.h>
+    /* This includes the Zlib interface header file zlib.h because libpng uses
+       libz and some of the Zlib interface, e.g. the Z_DEFLATED constant,
+       is part of the libpng interface.
+    */
 #include "pm_c_util.h"
 
 /* pngx is designed to be an extension of the PNG library to make using