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diff --git a/gs/libpng/contrib/gregbook/README b/gs/libpng/contrib/gregbook/README deleted file mode 100644 index 5b08bc6f8..000000000 --- a/gs/libpng/contrib/gregbook/README +++ /dev/null @@ -1,186 +0,0 @@ - =========================== - PNG: The Definitive Guide - =========================== - - Source Code - -Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free, -cross-platform demo programs that show how to use the libpng reference -library: rpng, rpng2 and wpng. rpng and rpng2 are viewers; the first is -a very simple example that that shows how a standard file-viewer might use -libpng, while the second is designed to process streaming data and shows -how a web browser might be written. wpng is a simple command-line program -that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets -of PBMPLUS/NetPBM) and converts them to PNG. - -The source code for all three demo programs currently compiles under -Unix, OpenVMS, and 32-bit Windows. (Special thanks to Martin Zinser, -zinser@decus.de, for making the necessary changes for OpenVMS and for -providing an appropriate build script.) Build instructions can be found -below. - -Files: - - README this file - LICENSE terms of distribution and reuse (BSD-like or GNU GPL) - COPYING GNU General Public License (GPL) - - Makefile.unx Unix makefile - Makefile.w32 Windows (MSVC) makefile - makevms.com OpenVMS build script - - rpng-win.c Windows front end for the basic viewer - rpng-x.c X Window System (Unix, OpenVMS) front end - readpng.c generic back end for the basic viewer - readpng.h header file for the basic viewer - - rpng2-win.c Windows front end for the progressive viewer - rpng2-x.c X front end for the progressive viewer - readpng2.c generic back end for the progressive viewer - readpng2.h header file for the progressive viewer - - wpng.c generic (text) front end for the converter - writepng.c generic back end for the converter - writepng.h header file for the converter - - toucan.png transparent PNG for testing (by Stefan Schneider) - -Note that, although the programs are designed to be functional, their -primary purpose is to illustrate how to use libpng to add PNG support to -other programs. As such, their user interfaces are crude and definitely -are not intended for everyday use. - -Please see http://www.libpng.org/pub/png/pngbook.html for further infor- -mation and links to the latest version of the source code, and Chapters -13-15 of the book for detailed discussion of the three programs. - -Greg Roelofs -http://pobox.com/~newt/greg_contact.html -2 June 2007 - - -BUILD INSTRUCTIONS - - - Prerequisites (in order of compilation): - - - zlib http://zlib.net/ - - libpng http://www.libpng.org/pub/png/libpng.html - - pngbook http://www.libpng.org/pub/png/book/sources.html - - The pngbook demo programs are explicitly designed to demonstrate proper - coding techniques for using the libpng reference library. As a result, - you need to download and build both zlib (on which libpng depends) and - libpng. A common build setup is to place the zlib, libpng and pngbook - subdirectory trees ("folders") in the same parent directory. Then the - libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]), - and similarly for the pngbook build. - - Note that all three packages are designed to be built from a command - line by default; those who wish to use a graphical or other integrated - development environments are on their own. - - - - Unix: - - Unpack the latest pngbook sources (which should correspond to this - README file) into a directory and change into that directory. - - Copy Makefile.unx to Makefile and edit the PNG* and Z* variables - appropriately (possibly also the X* variables if necessary). - - make - - There is no "install" target, so copy the three executables somewhere - in your path or run them from the current directory. All three will - print a basic usage screen when run without any command-line arguments; - see the book for more details. - - - - Windows: - - Unpack the latest pngbook sources (which should correspond to this - README file) into a folder, open a "DOS shell" or "command prompt" - or equivalent command-line window, and cd into the folder where you - unpacked the source code. - - For MSVC, set up the necessary environment variables by invoking - - %devstudio%\vc\bin\vcvars32.bat - - where where %devstudio% is the installation directory for MSVC / - DevStudio. If you get "environment out of space" errors under 95/98, - create a desktop shortcut with "c:\windows\command.com /e:4096" as - the program command line and set the working directory to the pngbook - directory. Then double-click to open the new DOS-prompt window with - a bigger environment and retry the commands above. - - Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables - appropriately (possibly also the "INC" and "LIB" variables if needed). - Note that the names of the dynamic and static libpng and zlib libraries - used in the makefile may change in later releases of the libraries. - Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work. - This makefile therefore builds statically linked executables, but if - the DLL problems ever get fixed, uncommenting the appropriate PNGLIB - and ZLIB lines will build dynamically linked executables instead. - - Do the build by typing - - nmake - - The result should be three executables: rpng-win.exe, rpng2-win.exe, - and wpng.exe. Copy them somewhere in your PATH or run them from the - current folder. Like the Unix versions, the two windowed programs - (rpng and rpng2) now display a usage screen in a console window when - invoked without command-line arguments; this is new behavior as of - the June 2001 release. Note that the programs use the Unix-style "-" - character to specify options, instead of the more common DOS/Windows - "/" character. (For example: "rpng2-win -bgpat 4 foo.png", not - "rpng2-win /bgpat 4 foo.png") - - - - OpenVMS: - - Unpack the pngbook sources into a subdirectory and change into that - subdirectory. - - Edit makevms.com appropriately, specifically the zpath and pngpath - variables. - - @makevms - - To run the programs, they probably first need to be set up as "foreign - symbols," with "disk" and "dir" set appropriately: - - $ rpng == "$disk:[dir]rpng-x.exe" - $ rpng2 == "$disk:[dir]rpng2-x.exe" - $ wpng == "$disk:[dir]wpng.exe" - - All three will print a basic usage screen when run without any command- - line arguments; see the book for more details. Note that the options - style is Unix-like, i.e., preceded by "-" rather than "/". - - -RUNNING THE PROGRAMS: (VERY) BRIEF INTRO - - rpng is a simple PNG viewer that can display transparent PNGs with a - specified background color; for example, - - rpng -bgcolor #ff0000 toucan.png - - would display the image with a red background. rpng2 is a progressive - viewer that simulates a web browser in some respects; it can display - images against either a background color or a dynamically generated - background image. For example: - - rpng2 -bgpat 16 toucan.png - - wpng is a purely command-line image converter from binary PBMPLUS/NetPBM - format (.pgm or .ppm) to PNG; for example, - - wpng -time < toucan-notrans.ppm > toucan-notrans.png - - would convert the specified PPM file (using redirection) to PNG, auto- - matically setting the PNG modification-time chunk. - - All options can be abbreviated to the shortest unique value; for example, - "-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma. |