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94 lines
4.1 KiB
Plaintext
94 lines
4.1 KiB
Plaintext
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VisualStudio instructions
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libpng version 1.4.4beta01 - June 26, 2010
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Copyright (c) 1998-2010 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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This is a slightly modified copy of the 'vstudio' solution from libpng
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1.5; it is intended to provide compatibility for libpng 1.4 with later
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releases of zlib (from 1.2.4) and to provide a migration aid for 1.5.
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A 'VB' DLL is no longer produced - use the standard 'Release' DLL.
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Initial preparations
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====================
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You should install the 'official' build of zlib on your system - follow the
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instructions provided on http://www.zlib.net. When a new release is being
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made of zlib the instructions disappear for a while until the new official
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build is available. You will have to wait.
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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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Make sure that your official build layout matches the requirements listed
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in zlib.props. Prior to zlib-1.2.4 the official build (1.2.3) placed
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include and library files in different directories - if you find this
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has happened just put them all in the same directory.
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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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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.)
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If, despite the previous paragraph, you still feel you need a debug build you
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will have to download the zlib source as well (http://www.zlib.net) and include
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the directory where you unpack it in zlib.props. This solution will then be
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able to build a minimal zlib sufficient for libpng. This build is only
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suitable for making a debug libpng.
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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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This solution only supports the Multi-Threaded DLL C Runtime
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============================================================
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If you examine the solution you will find that it very deliberately lists
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exactly which MicroSoft DLLs it is linking against. It explicitly links
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against msvcrt.lib. The debug version links against msvcrtd.lib (this is
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why it is a debug version - it's nothing to do with having any special
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debug support, it doesn't).
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These versions of the MicroSoft C runtime correspond to the compiler flags
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/MD (release) and /MDd (debug) - the "Multi-Threaded DLL" implementation of the
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C runtime library.
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If you need to change this then you will have to make sure that both the
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compiler flags and the ".lib" in the linker dependences match up. Fortunately
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neither zlib nor libpng require libraries other than a C runtime and
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kernel32.
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You cannot pass (FILE*) objects from a different runtime (including msvcrtd
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to msvcrt) to libpng. If you do then your program will crash within libpng
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when it first makes a file read or write call.
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It is likely if you have read this far that you have found you can't avoid
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having multiple C runtimes in your program. This is OK, it does work, but
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you will have to implement the libpng file read/write callbacks rather than
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using the internal libpng default. This is easy.
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