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88 lines
3.4 KiB
Plaintext
88 lines
3.4 KiB
Plaintext
Instructions for building libpng using Microsoft Visual Studio
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==============================================================
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Copyright (c) 2018,2022 Cosmin Truta
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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 and license
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in png.h
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This directory contains a solution for building libpng under Microsoft
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Visual Studio 2019. It may also work under earlier or later versions
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of Visual Studio. You should be familiar with Visual Studio before
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using this solution.
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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
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build with this 'solution'. Please read and edit zlib.props first.
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You will probably not be familiar with the contents of zlib.props -
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do not worry, 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
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the optimization may make it difficult to debug. Simply rebuild with a
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lower 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
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builds a DLL for libpng with the default runtime options used by Visual
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Studio. In particular the runtime library is the "MultiThreaded DLL"
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version. If you use Visual Studio defaults to build your application,
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you should have no problems.
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If you don't use the Visual Studio defaults your application must still
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be built with the default runtime option (/MD). If, for some reason,
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it is not then your application will crash inside libpng16.dll as soon
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as libpng tries to read from a file handle you pass in.
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If you do not want to use the DLL, and prefer static linking instead,
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you may choose the 'release library' configuration. This is built with
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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),
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otherwise it will not build (if you are lucky) or it will crash (if you
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are not.) See the WARNING file that is distributed with this README.
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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.
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You do not need these unless your own solution itself uses debug builds
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(it is far more effective to debug on the release builds, there is no
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point building a special debug build unless you have heap corruption
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problems that you can't track down.)
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The debug build of libpng is minimally supported. Support for debug
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builds of zlib is also minimal. Please keep this in mind, if you want
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to use it.
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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
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static library builds of libpng; instead of the shared DLL runtime, it
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uses a static runtime. If you need to change this, make sure to change
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the setting on all the 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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Also, be sure to build libpng, zlib, and your project, all for the same
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platform (e.g., 32-bit or 64-bit).
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