[libpng15] Added palette-index checking.

libpng-manual.txt

@@ -1,6 +1,6 @@
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.5.10beta03 - February 27, 2012
+ libpng version 1.5.10beta03 - March 5, 2012
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.10beta03 - February 27, 2012
+ libpng versions 0.97, January 1998, through 1.5.10beta03 - March 5, 2012
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -4142,6 +4142,15 @@ X.  Changes to Libpng from version 1.4.x to 1.5.x
 From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
 function) incorrectly returned a value of type png_uint_32.
 
+Checking for invalid palette index on read or write was added at libpng
+1.5.10.  This is enabled by default but can be disabled in each png_ptr with
+
+   png_set_check_for_invalid_index(png_ptr, allowed);
+
+      allowed  - one of
+                 0: disable
+                 1: enable
+
 A. Changes that affect users of libpng
 
 There are no substantial API changes between the non-deprecated parts of
@@ -4587,7 +4596,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 XIV. Y2K Compliance in libpng
 
-February 27, 2012
+March 5, 2012
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.