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96 lines
3.6 KiB
Plaintext
96 lines
3.6 KiB
Plaintext
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VisualStudio instructions
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libpng version 1.7.0beta77 - January 7, 2016
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Copyright (c) 2010,2013,2015 Glenn Randers-Pehrson
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This code is released under the libpng license.
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For conditions of distribution and use, see the disclaimer
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and license in png.h
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This directory contains support for building libpng under MicroSoft
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VisualStudio 2010. It may also work under later versions of VisualStudio.
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You should be familiar with VisualStudio before using this directory.
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Initial preparations
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====================
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You must enter some information in zlib.props before attempting to build
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with this 'solution'. Please read and edit zlib.props first. You will
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probably not be familiar with the contents of zlib.props - do not worry,
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it is mostly harmless.
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This is all you need to do to build the 'release' and 'release library'
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configurations.
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Debugging
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=========
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The release configurations default to /Ox optimization. Full debugging
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information is produced (in the .pdb), but if you encounter a problem the
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optimization may make it difficult to debug. Simply rebuild with a lower
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optimization level (e.g. /Od.)
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Linking your application
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========================
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Normally you should link against the 'release' configuration. This builds a
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DLL for libpng with the default runtime options used by Visual Studio 2010.
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In particular the runtime library is the "MultiThreaded DLL" version.
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If you use Visual Studio defaults to build your application you will have no
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problems.
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If you don't use the Visual Studio defaults your application must still be
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built with the default runtime option (/MD). If, for some reason, it is not
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then your application will crash inside libpng17.dll as soon as libpng
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tries to read from a file handle you pass in.
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If you do not want to use the DLL, for example for a very small application,
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the 'release library' configuration may be more appropriate. This is built
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with a non-standard runtime library - the "MultiThreaded" version. When you
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build your application it must be compiled with this option (/MT), otherwise
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it will not build (if you are lucky) or crash (if you are not.) See the
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WARNING file that is distributed along with this readme.txt.
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Stop reading here
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=================
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You have enough information to build a working application.
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Debug versions have limited support
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===================================
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This solution includes limited support for debug versions of libpng. You
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do not need these unless your own solution itself uses debug builds (it is
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far more effective to debug on the release builds, there is no point building
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a special debug build unless you have heap corruption problems that you can't
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track down.)
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The debug build of libpng is minimally supported. Support for debug builds of
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zlib is also minimal. You really don't want to do this.
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WARNING
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=======
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Libpng 1.6.x does not use the default run-time library when building static
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library builds of libpng; instead of the shared DLL runtime it uses a static
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runtime. If you need to change this make sure to change the setting on all the
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relevant projects:
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libpng
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zlib
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all the test programs
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The runtime library settings for each build are as follows:
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Release Debug
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DLL /MD /MDd
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Library /MT /MTd
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NOTICE that libpng 1.5.x erroneously used /MD for Debug DLL builds; if you used
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the debug builds in your app and you changed your app to use /MD you will need
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to change it back to /MDd for libpng 1.6.0 and later.
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The Visual Studio 2010 defaults for a Win32 DLL or Static Library project are
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as follows:
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Release Debug
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DLL /MD /MDd
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Static Library /MD /MDd
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