lodepng 2019-06-16 (430268ba)

Code extracted from:

    https://gitlab.kitware.com/third-party/lodepng.git

at commit 430268baa882a707c36b356402b94ab14dc08b69 (for/vtk-m).

LICENSE

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+Copyright (c) 2005-2018 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+    

README.md

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+LodePNG
+-------
+
+PNG encoder and decoder in C and C++, without dependencies
+
+Home page: http://lodev.org/lodepng/
+
+### Documentation
+
+Detailed documentation is included in a large comment in the second half of the
+header file lodepng.h.
+
+Source code examples using LodePNG can be found in the examples directory.
+
+An FAQ can be found on http://lodev.org/lodepng/
+
+### Building
+
+Only two files are needed to encode and decode PNGs:
+
+* lodepng.cpp (or lodepng.c)
+* lodepng.h
+
+All other files are just source code examples, tests, misc utilities, etc..., which
+are normally not needed in projects using this.
+
+You can include the files directly in your project's source tree and its
+makefile, IDE project file, or other build system. No library is necessary.
+
+In addition to C++, LodePNG also supports ANSI C (C89), with all the same
+functionality: C++ only adds extra convenience API.
+
+For C, rename lodepng.cpp to lodepng.c.
+
+Consider using git submodules to include LodePNG in your project.
+
+### Building in C++
+
+If you have a hypothetical main.cpp that #includes and uses lodepng.h, you can build as follows:
+
+g++ main.cpp lodepng.cpp -Wall -Wextra -pedantic -ansi -O3
+
+or:
+
+clang++ main.cpp lodepng.cpp -Wall -Wextra -pedantic -ansi -O3
+
+This shows compiler flags it was designed for, but normally one would use the
+compiler or build system of their project instead of those commands, and other
+C++ compilers are supported.
+
+### Building in C
+
+Rename lodepng.cpp to lodepng.c for this.
+
+If you have a hypothetical main.c that #includes and uses lodepng.h, you can build as follows:
+
+gcc main.c lodepng.c -ansi -pedantic -Wall -Wextra -O3
+
+or
+
+clang main.c lodepng.c -ansi -pedantic -Wall -Wextra -O3
+
+This shows compiler flags it was designed for, but normally one would use the
+compiler or build system of their project instead of those commands, and other
+C compilers are supported.