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diff --git a/src/3rdparty/libpng/TODO b/src/3rdparty/libpng/TODO
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--- a/src/3rdparty/libpng/TODO
+++ b/src/3rdparty/libpng/TODO
@@ -1,3 +1,4 @@
+/*
TODO - list of things to do for libpng:
Final bug fixes.
@@ -17,9 +18,14 @@ Better filter selection
(counting huffman bits/precompression? filter inertia? filter costs?).
Histogram creation.
Text conversion between different code pages (Latin-1 -> Mac and DOS).
-Should we always malloc 2^bit_depth PLTE/tRNS/hIST entries for safety?
Build gamma tables using fixed point (and do away with floating point entirely).
+Avoid building gamma tables whenever possible.
Use greater precision when changing to linear gamma for compositing against
background and doing rgb-to-gray transformation.
Investigate pre-incremented loop counters and other loop constructions.
Add interpolated method of handling interlacing.
+Provide for conditional compilation of 16-bit support (except for the
+ initial stripping down to 8-bits when reading a 16-bit PNG datastream).
+Switch to the simpler zlib (zlib/libpng) license if legally possible.
+
+*/