Update to libpng 1.2.52 (rollup change only)

third_party/libpng/pngconf.h

 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.45 - July 7, 2011
- * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * libpng version 1.2.52 - November 20, 2014
+ * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
  * and license in png.h
  */
 
 /* Any machine specific code is near the front of this file, so if you
  * are configuring libpng for a machine, you may want to read the section
@@ skipping 63 matching lines @@
 /* End of material added to libpng-1.2.8 */
 
 /* Added at libpng-1.2.19, removed at libpng-1.2.20 because it caused trouble
    Restored at libpng-1.2.21 */
 #if !defined(PNG_NO_WARN_UNINITIALIZED_ROW) && \
     !defined(PNG_WARN_UNINITIALIZED_ROW)
 #  define PNG_WARN_UNINITIALIZED_ROW 1
 #endif
 /* End of material added at libpng-1.2.19/1.2.21 */
 
+/* Added at libpng-1.2.51 (ported from 1.4.6) */
+#ifndef PNG_UNUSED
+/* Unused formal parameter warnings are silenced using the following macro
+ * which is expected to have no bad effects on performance (optimizing
+ * compilers will probably remove it entirely).  Note that if you replace
+ * it with something other than whitespace, you must include the terminating
+ * semicolon.
+ */
+#  define PNG_UNUSED(param) (void)param;
+#endif
+/* End of material added to libpng-1.4.6 */
+
 /* This is the size of the compression buffer, and thus the size of
  * an IDAT chunk.  Make this whatever size you feel is best for your
  * machine.  One of these will be allocated per png_struct.  When this
  * is full, it writes the data to the disk, and does some other
  * calculations.  Making this an extremely small size will slow
  * the library down, but you may want to experiment to determine
  * where it becomes significant, if you are concerned with memory
  * usage.  Note that zlib allocates at least 32Kb also.  For readers,
  * this describes the size of the buffer available to read the data in.
  * Unless this gets smaller than the size of a row (compressed),
@@ skipping 762 matching lines @@
 #  define PNG_USER_WIDTH_MAX 1000000L
 #endif
 #ifndef PNG_USER_HEIGHT_MAX
 #  define PNG_USER_HEIGHT_MAX 1000000L
 #endif
 
 /* Added at libpng-1.2.43.  To accept all valid PNGs no matter
  * how large, set these two limits to 0.
  */
 #ifndef PNG_USER_CHUNK_CACHE_MAX
-#  define PNG_USER_CHUNK_CACHE_MAX 0
+#  define PNG_USER_CHUNK_CACHE_MAX 32765
 #endif
 
 /* Added at libpng-1.2.43 */
 #ifndef PNG_USER_CHUNK_MALLOC_MAX
 #  define PNG_USER_CHUNK_MALLOC_MAX 0
 #endif
 
 #ifndef PNG_LITERAL_SHARP
 #  define PNG_LITERAL_SHARP 0x23
 #endif
@@ skipping 774 matching lines @@
  */
 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
 #  undef PNG_ZBUF_SIZE
 #  define PNG_ZBUF_SIZE 65536L
 #endif
 
 /* Added at libpng-1.2.8 */
 #endif /* PNG_VERSION_INFO_ONLY */
 
 #endif /* PNGCONF_H */