| | 1 | |
| | 2 | VisualStudio instructions |
| | 3 | |
| | 4 | libpng version 1.5.6 - November 3, 2011 |
| | 5 | |
| | 6 | Copyright (c) 1998-2010 Glenn Randers-Pehrson |
| | 7 | |
| | 8 | This code is released under the libpng license. |
| | 9 | For conditions of distribution and use, see the disclaimer |
| | 10 | and license in png.h |
| | 11 | |
| | 12 | This directory contains support for building libpng under MicroSoft |
| | 13 | VisualStudio 2010. It may also work under later versions of VisualStudio. |
| | 14 | You should be familiar with VisualStudio before using this directory. |
| | 15 | |
| | 16 | Initial preparations |
| | 17 | ==================== |
| | 18 | You must enter some information in zlib.props before attempting to build |
| | 19 | with this 'solution'. Please read and edit zlib.props first. You will |
| | 20 | probably not be familiar with the contents of zlib.props - do not worry, |
| | 21 | it is mostly harmless. |
| | 22 | |
| | 23 | This is all you need to do to build the 'release' and 'release library' |
| | 24 | configurations. |
| | 25 | |
| | 26 | Debugging |
| | 27 | ========= |
| | 28 | The release configurations default to /Ox optimization. Full debugging |
| | 29 | information is produced (in the .pdb), but if you encounter a problem the |
| | 30 | optimization may make it difficult to debug. Simply rebuild with a lower |
| | 31 | optimization level (e.g. /Od.) |
| | 32 | |
| | 33 | Linking your application |
| | 34 | ======================== |
| | 35 | Normally you should link against the 'release' configuration. This builds a |
| | 36 | DLL for libpng 1.5 with the default runtime options used by Visual Studio |
| | 37 | 2010. In particular the runtime library is the "MultiThreaded DLL" version. |
| | 38 | If you use Visual Studio defaults to build your application you will have no |
| | 39 | problems. |
| | 40 | |
| | 41 | If you don't use the Visual Studio defaults your application must still be built |
| | 42 | with the default runtime option (/MD). If, for some reason, it is not then your |
| | 43 | application will crash inside libpng15.dll as soon as libpng tries to read |
| | 44 | from a file handle you pass in. |
| | 45 | |
| | 46 | If you do not want to use the DLL, for example for a very small application, |
| | 47 | the 'release library' configuration may be more appropriate. This is built |
| | 48 | with a non-standard runtime library - the "MultiThreaded" version. When you |
| | 49 | build your application it must be compiled with this option (/MT), otherwise |
| | 50 | it will not build (if you are lucky) or crash (if you are not.) |
| | 51 | |
| | 52 | Stop reading here |
| | 53 | ================= |
| | 54 | You have enough information to build a working application. |
| | 55 | |
| | 56 | Debug versions have limited support |
| | 57 | =================================== |
| | 58 | This solution includes limited support for debug versions of libpng. You |
| | 59 | do not need these unless your own solution itself uses debug builds (it is |
| | 60 | far more effective to debug on the release builds, there is no point building |
| | 61 | a special debug build.) |
| | 62 | |
| | 63 | The debug build of libpng is minimally supported. Support for debug builds of |
| | 64 | zlib is also minimal. You really don't want to do this. |
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