Restore lib png

Engine/lib/CMakeLists.txt

@@ -171,11 +171,12 @@ set(PNG_STATIC on CACHE BOOL "" FORCE)
 mark_as_advanced(PNG_STATIC)
 set(PNG_SHARED off CACHE BOOL "" FORCE)
 mark_as_advanced(PNG_SHARED)
-set(PNG_BUILD_ZLIB on CACHE BOOL "" FORCE)
+set(PNG_BUILD_ZLIB OFF CACHE BOOL "" FORCE)
 mark_as_advanced(PNG_BUILD_ZLIB)
 set(PNG_TESTS off CACHE BOOL "" FORCE)
 mark_as_advanced(PNG_TESTS)
 set(PNG_HARDWARE_OPTIMIZATIONS on CACHE BOOL "" FORCE)
+set(SKIP_INSTALL_ALL ON CACHE BOOL "" FORCE)
 mark_as_advanced(PNG_HARDWARE_OPTIMIZATIONS)
 
 if(APPLE)
@@ -186,6 +187,7 @@ endif()
 mark_as_advanced(PNG_DEBUG)
 mark_as_advanced(PNG_FRAMEWORK)
 mark_as_advanced(PNG_PREFIX)
+add_subdirectory(lpng ${TORQUE_LIB_TARG_DIRECTORY}/lpng EXCLUDE_FROM_ALL)
 
 add_subdirectory(tinyxml2 ${TORQUE_LIB_TARG_DIRECTORY}/tinyxml2 EXCLUDE_FROM_ALL)
 add_subdirectory(opcode ${TORQUE_LIB_TARG_DIRECTORY}/opcode EXCLUDE_FROM_ALL)

Engine/lib/lpng/ANNOUNCE

@@ -0,0 +1,47 @@
+libpng 1.6.37 - April 14, 2019
+==============================
+
+This is a public release of libpng, intended for use in production code.
+
+
+Files available for download
+----------------------------
+
+Source files with LF line endings (for Unix/Linux):
+
+ * libpng-1.6.37.tar.xz (LZMA-compressed, recommended)
+ * libpng-1.6.37.tar.gz
+
+Source files with CRLF line endings (for Windows):
+
+ * lp1637.7z (LZMA-compressed, recommended)
+ * lp1637.zip
+
+Other information:
+
+ * README.md
+ * LICENSE.md
+ * AUTHORS.md
+ * TRADEMARK.md
+
+
+Changes since the previous public release (version 1.6.36)
+----------------------------------------------------------
+
+ * Fixed a use-after-free vulnerability (CVE-2019-7317) in png_image_free.
+ * Fixed a memory leak in the ARM NEON implementation of png_do_expand_palette.
+ * Fixed a memory leak in pngtest.c.
+ * Fixed two vulnerabilities (CVE-2018-14048, CVE-2018-14550) in
+   contrib/pngminus; refactor.
+ * Changed the license of contrib/pngminus to MIT; refresh makefile and docs.
+   (Contributed by Willem van Schaik)
+ * Fixed a typo in the libpng license v2.
+   (Contributed by Miguel Ojeda)
+ * Added makefiles for AddressSanitizer-enabled builds.
+ * Cleaned up various makefiles.
+
+
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net.
+Subscription is required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe.

Engine/lib/lpng/AUTHORS

@@ -0,0 +1,45 @@
+PNG REFERENCE LIBRARY AUTHORS
+=============================
+
+This is the list of PNG Reference Library ("libpng") Contributing
+Authors, for copyright and licensing purposes.
+
+ * Andreas Dilger
+ * Cosmin Truta
+ * Dave Martindale
+ * Eric S. Raymond
+ * Gilles Vollant
+ * Glenn Randers-Pehrson
+ * Greg Roelofs
+ * Guy Eric Schalnat
+ * James Yu
+ * John Bowler
+ * Kevin Bracey
+ * Magnus Holmgren
+ * Mandar Sahastrabuddhe
+ * Mans Rullgard
+ * Matt Sarett
+ * Mike Klein
+ * Paul Schmidt
+ * Sam Bushell
+ * Samuel Williams
+ * Simon-Pierre Cadieux
+ * Tim Wegner
+ * Tom Lane
+ * Tom Tanner
+ * Vadim Barkov
+ * Willem van Schaik
+ * Zhijie Liang
+ * Arm Holdings
+   - Richard Townsend
+ * Google Inc.
+   - Matt Sarett
+   - Mike Klein
+
+The build projects, the build scripts, the test scripts, and other
+files in the "projects", "scripts" and "tests" directories, have other
+copyright owners, but are released under the libpng license.
+
+Some files in the "contrib" directory, and some tools-generated files
+that are distributed with libpng, have other copyright owners, and are
+released under other open source licenses.