Add libpng 1.4.0

This is a clean copy of libpng 1.2.40, except that the contribs
directory has been removed, as usual. Our build modifications
will follow in a separate commit.

1 files changed, 55 insertions, 0 deletions

diff --git a/src/3rdparty/libpng/projects/visualc6/README.txt b/src/3rdparty/libpng/projects/visualc6/README.txt
new file mode 100644
index 0000000..b650e9e
--- /dev/null
+++ b/src/3rdparty/libpng/projects/visualc6/README.txt
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+Microsoft Developer Studio Project File, Format Version 6.00 for libpng.
+
+Copyright (C) 2000-2004 Simon-Pierre Cadieux.
+Copyright (C) 2004 Cosmin Truta.
+
+This code is released under the libpng license.
+For conditions of distribution and use, see copyright notice in png.h
+
+
+Assumptions:
+* The libpng source files are in ..\..
+* The zlib source files are in ..\..\..\zlib
+* The zlib project files are in ..\..\..\zlib\projects\visualc6
+
+
+To use:
+
+1) On the main menu, select "File | Open Workspace".
+   Open "libpng.dsw".
+
+2) Select "Build | Set Active Configuration".
+   Choose the configuration you wish to build.
+   (Choose libpng or pngtest; zlib will be built automatically.)
+
+3) Select "Build | Clean".
+
+4) Select "Build | Build ... (F7)".  Ignore warning messages about
+   not being able to find certain include files (e.g. alloc.h).
+
+5) If you built the sample program (pngtest),
+   select "Build | Execute ... (Ctrl+F5)".
+
+
+This project builds the libpng binaries as follows:
+
+* Win32_DLL_Release\libpng14.dll      DLL build
+* Win32_DLL_Debug\libpng14d.dll       DLL build (debug version)
+* Win32_DLL_VB\libpng14vb.dll         DLL build for Visual Basic, using stdcall
+* Win32_LIB_Release\libpng.lib        static build
+* Win32_LIB_Debug\libpngd.lib         static build (debug version)
+
+
+Notes:
+
+If you change anything in the source files, or select different compiler
+settings, please change the DLL name to something different than any of
+the above names. Also, make sure that in your "pngusr.h" you define
+PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX according to the
+instructions provided in "pngconf.h".
+
+All DLLs built by this project use the Microsoft dynamic C runtime library
+MSVCRT.DLL (MSVCRTD.DLL for debug versions).  If you distribute any of the
+above mentioned libraries you should also include this DLL in your package.
+For a list of files that are redistributable in Visual C++ 6.0, see
+Common\Redist\Redist.txt on Disc 1 of the Visual C++ 6.0 product CDs.