author | Maciej Jablonski <maciej.jablonski@sosco.com> |
Wed, 12 May 2010 23:13:16 +0100 | |
changeset 72 | d00bf4f57250 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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=========================== |
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PNG: The Definitive Guide |
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=========================== |
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Source Code |
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Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free, |
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cross-platform demo programs that show how to use the libpng reference |
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library: rpng, rpng2 and wpng. rpng and rpng2 are viewers; the first is |
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a very simple example that that shows how a standard file-viewer might use |
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libpng, while the second is designed to process streaming data and shows |
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how a web browser might be written. wpng is a simple command-line program |
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that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets |
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of PBMPLUS/NetPBM) and converts them to PNG. |
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The source code for all three demo programs currently compiles under |
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Unix, OpenVMS, and 32-bit Windows. (Special thanks to Martin Zinser, |
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zinser@decus.de, for making the necessary changes for OpenVMS and for |
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providing an appropriate build script.) Build instructions can be found |
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below. |
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Files: |
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README this file |
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LICENSE terms of distribution and reuse (BSD-like or GNU GPL) |
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COPYING GNU General Public License (GPL) |
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Makefile.unx Unix makefile |
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Makefile.w32 Windows (MSVC) makefile |
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makevms.com OpenVMS build script |
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rpng-win.c Windows front end for the basic viewer |
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rpng-x.c X Window System (Unix, OpenVMS) front end |
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readpng.c generic back end for the basic viewer |
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readpng.h header file for the basic viewer |
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rpng2-win.c Windows front end for the progressive viewer |
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rpng2-x.c X front end for the progressive viewer |
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readpng2.c generic back end for the progressive viewer |
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readpng2.h header file for the progressive viewer |
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|
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wpng.c generic (text) front end for the converter |
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writepng.c generic back end for the converter |
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writepng.h header file for the converter |
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toucan.png transparent PNG for testing (by Stefan Schneider) |
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Note that, although the programs are designed to be functional, their |
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primary purpose is to illustrate how to use libpng to add PNG support to |
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other programs. As such, their user interfaces are crude and definitely |
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are not intended for everyday use. |
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Please see http://www.libpng.org/pub/png/pngbook.html for further infor- |
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mation and links to the latest version of the source code, and Chapters |
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13-15 of the book for detailed discussion of the three programs. |
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Greg Roelofs |
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http://pobox.com/~newt/greg_contact.html |
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16 March 2008 |
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BUILD INSTRUCTIONS |
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- Prerequisites (in order of compilation): |
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- zlib http://zlib.net/ |
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- libpng http://www.libpng.org/pub/png/libpng.html |
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- pngbook http://www.libpng.org/pub/png/book/sources.html |
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The pngbook demo programs are explicitly designed to demonstrate proper |
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coding techniques for using the libpng reference library. As a result, |
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you need to download and build both zlib (on which libpng depends) and |
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libpng. A common build setup is to place the zlib, libpng and pngbook |
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subdirectory trees ("folders") in the same parent directory. Then the |
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libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]), |
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and similarly for the pngbook build. |
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Note that all three packages are designed to be built from a command |
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line by default; those who wish to use a graphical or other integrated |
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development environments are on their own. |
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- Unix: |
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Unpack the latest pngbook sources (which should correspond to this |
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README file) into a directory and change into that directory. |
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Copy Makefile.unx to Makefile and edit the PNG* and Z* variables |
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appropriately (possibly also the X* variables if necessary). |
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make |
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There is no "install" target, so copy the three executables somewhere |
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in your path or run them from the current directory. All three will |
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print a basic usage screen when run without any command-line arguments; |
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see the book for more details. |
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- Windows: |
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Unpack the latest pngbook sources (which should correspond to this |
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README file) into a folder, open a "DOS shell" or "command prompt" |
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or equivalent command-line window, and cd into the folder where you |
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unpacked the source code. |
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For MSVC, set up the necessary environment variables by invoking |
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|
107 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
108 |
%devstudio%\vc\bin\vcvars32.bat |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
109 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
110 |
where where %devstudio% is the installation directory for MSVC / |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
111 |
DevStudio. If you get "environment out of space" errors under 95/98, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
112 |
create a desktop shortcut with "c:\windows\command.com /e:4096" as |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
113 |
the program command line and set the working directory to the pngbook |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
114 |
directory. Then double-click to open the new DOS-prompt window with |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
115 |
a bigger environment and retry the commands above. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
116 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
117 |
Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
118 |
appropriately (possibly also the "INC" and "LIB" variables if needed). |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
119 |
Note that the names of the dynamic and static libpng and zlib libraries |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
120 |
used in the makefile may change in later releases of the libraries. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
121 |
Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
122 |
This makefile therefore builds statically linked executables, but if |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
123 |
the DLL problems ever get fixed, uncommenting the appropriate PNGLIB |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
124 |
and ZLIB lines will build dynamically linked executables instead. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
125 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
126 |
Do the build by typing |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
127 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
128 |
nmake |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
129 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
130 |
The result should be three executables: rpng-win.exe, rpng2-win.exe, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
131 |
and wpng.exe. Copy them somewhere in your PATH or run them from the |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
132 |
current folder. Like the Unix versions, the two windowed programs |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
133 |
(rpng and rpng2) now display a usage screen in a console window when |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
134 |
invoked without command-line arguments; this is new behavior as of |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
135 |
the June 2001 release. Note that the programs use the Unix-style "-" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
136 |
character to specify options, instead of the more common DOS/Windows |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
137 |
"/" character. (For example: "rpng2-win -bgpat 4 foo.png", not |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
138 |
"rpng2-win /bgpat 4 foo.png") |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
139 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
140 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
141 |
- OpenVMS: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
142 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
143 |
Unpack the pngbook sources into a subdirectory and change into that |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
144 |
subdirectory. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
145 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
146 |
Edit makevms.com appropriately, specifically the zpath and pngpath |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
147 |
variables. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
148 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
149 |
@makevms |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
150 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
151 |
To run the programs, they probably first need to be set up as "foreign |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
152 |
symbols," with "disk" and "dir" set appropriately: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
153 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
154 |
$ rpng == "$disk:[dir]rpng-x.exe" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
155 |
$ rpng2 == "$disk:[dir]rpng2-x.exe" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
156 |
$ wpng == "$disk:[dir]wpng.exe" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
157 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
158 |
All three will print a basic usage screen when run without any command- |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
159 |
line arguments; see the book for more details. Note that the options |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
160 |
style is Unix-like, i.e., preceded by "-" rather than "/". |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
161 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
162 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
163 |
RUNNING THE PROGRAMS: (VERY) BRIEF INTRO |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
164 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
165 |
rpng is a simple PNG viewer that can display transparent PNGs with a |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
166 |
specified background color; for example, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
167 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
168 |
rpng -bgcolor #ff0000 toucan.png |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
169 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
170 |
would display the image with a red background. rpng2 is a progressive |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
171 |
viewer that simulates a web browser in some respects; it can display |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
172 |
images against either a background color or a dynamically generated |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
173 |
background image. For example: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
174 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
175 |
rpng2 -bgpat 16 toucan.png |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
176 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
177 |
wpng is a purely command-line image converter from binary PBMPLUS/NetPBM |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
178 |
format (.pgm or .ppm) to PNG; for example, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
179 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
180 |
wpng -time < toucan-notrans.ppm > toucan-notrans.png |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
181 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
182 |
would convert the specified PPM file (using redirection) to PNG, auto- |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
183 |
matically setting the PNG modification-time chunk. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
184 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
185 |
All options can be abbreviated to the shortest unique value; for example, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
186 |
"-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma. |