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# $Id: README.Png,v 1.1 2001/03/02 18:06:18 reinelt Exp $
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This is the README file for the Png display driver for lcd4linux.

Preliminarys: libgd, libpng, libz
Optional: perl, apache

The driver creates the output file specified with the -o switch. The
parameter is used as a format string for sprintf(), if you specify '%d'
in the output file, files with a sequence number will be created.

The output file is first created with a '.tmp' extension, this temporary
file will be written and closed, and finally (atomically) renamed. This way
you can be shure that you will always get a complete file, but its contents
changes every 'tick' milliseconds. 

Configuration:

The driver needs/supports the following entries in lcd4linux.conf:

Display: must be "Png"
size: [columns]x[rows], e.g. "20x4"
font: [xrex]x[yres], at the moment only "5x8" and "6x8" supported.
pixel: [pixelsize]+[pixelgap], e.g. "5+1"
gap: [row gap]x[column gap], e.g. "3x3"
border: border width
foreground: color of an active LCD Pixel, must be #rrggbb
halfground: color of an inactive LCD Pixel, must be #rrggbb
background: backlight color, must be #rrggbb

For details please look into README.Raster.

To display this png file continuosly in a web page, follow these instructions:
Copy the sample png.html to an appropriate place under your htdocs.
Copy the sample nph-png perl script into your cgi-bin directory, and adjust
png.html to contain this directory.
Adjust nph-png to contain the path/filename of the outputfile (s -o above).
Start lcd4linux -o path/filename.png.
If you are on a slow connection to your webserver you might also adjust the
$DELAY in nph-png or in lcd4linux.conf.

Note: depending on your webervers configuration, you must rename nph-png to
   nph-png.pl or npg-png.cgi.

Have fun.
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<div class='path'>path: <a href='/lcd4linux.git/log/?id=7fc8ef21bd019295cd73c9d805af727083dcc2be&amp;follow=1'>root</a>/<a href='/lcd4linux.git/log/drv_Sample.c?id=7fc8ef21bd019295cd73c9d805af727083dcc2be&amp;follow=1'>drv_Sample.c</a> (<a href='/lcd4linux.git/log/drv_Sample.c?id=7fc8ef21bd019295cd73c9d805af727083dcc2be'>unfollow</a>)</div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/lcd4linux.git/log/drv_Sample.c?id=7fc8ef21bd019295cd73c9d805af727083dcc2be&amp;showmsg=1&amp;follow=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2011-02-12 22:46:19 +0000'>2011-02-12</span></td><td><a href='/lcd4linux.git/commit/timer.c?id=f17287509f698f21f38ae047a306ddca3fc13140&amp;follow=1'>timer.c: fixed detection of positive clock skew (and some typos)</a></td><td>mzuther</td><td>4</td><td><span class='deletions'>-10</span>/<span class='insertions'>+10</span></td></tr>
<tr><td><span title='2011-01-23 22:45:46 +0000'>2011-01-23</span></td><td><a href='/lcd4linux.git/commit/timer.c?id=5e69b1e3961ee896d44107c05650c915d9b24298&amp;follow=1'>timer.c: fixed clock skew detection</a></td><td>mzuther</td><td>1</td><td><span class='deletions'>-26</span>/<span class='insertions'>+46</span></td></tr>
<tr><td><span title='2011-01-23 17:01:08 +0000'>2011-01-23</span></td><td><a href='/lcd4linux.git/commit/timer.c?id=c15760b9e502d12e4905ef898e9694436ec3bde3&amp;follow=1'>timer.c: skip intermediate timer intervals</a></td><td>mzuther</td><td>2</td><td><span class='deletions'>-16</span>/<span class='insertions'>+46</span></td></tr>
<tr><td><span title='2011-01-05 03:49:07 +0000'>2011-01-05</span></td><td><a href='/lcd4linux.git/commit/drv_MatrixOrbital.c?id=72e1f7501bd6806022b7a33e1424ea2cc7fa4059&amp;follow=1'>fix for a bug introduced in the DE-LD021 driver</a></td><td>michael</td><td>1</td><td><span class='deletions'>-3</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2011-01-04 01:58:59 +0000'>2011-01-04</span></td><td><a href='/lcd4linux.git/commit/timer.c?id=f95cad51ea998c6febe30b9da74bd2852449d3c1&amp;follow=1'>indentation</a></td><td>michael</td><td>2</td><td><span class='deletions'>-3</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2011-01-04 01:58:25 +0000'>2011-01-04</span></td><td><a href='/lcd4linux.git/commit/drv_MatrixOrbital.c?id=0da867144a9cc418a2311efa816efcbdef7df70a&amp;follow=1'>support for Sure Electronics DE-LD021 by Natanael Olaiz</a></td><td>michael</td><td>1</td><td><span class='deletions'>-10</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2011-01-02 00:39:10 +0000'>2011-01-02</span></td><td><a href='/lcd4linux.git/commit/smoketest.sh?id=8dd087e587f0a84ab9b30965d085e65efdb57715&amp;follow=1'>driver for EFN LED modules by Tilman Glötzner</a></td><td>michael</td><td>9</td><td><span class='deletions'>-21</span>/<span class='insertions'>+469</span></td></tr>
<tr><td><span title='2010-11-28 16:07:16 +0000'>2010-11-28</span></td><td><a href='/lcd4linux.git/commit/timer_group.h?id=475fdb43971a24c01db6d8bf5cb4351eb6b76cfe&amp;follow=1'>commented, corrected and beautified both timer and timer group code</a></td><td>mzuther</td><td>11</td><td><span class='deletions'>-197</span>/<span class='insertions'>+511</span></td></tr>
<tr><td><span title='2010-11-27 14:35:10 +0000'>2010-11-27</span></td><td><a href='/lcd4linux.git/commit/timer.h?id=00db296b07befe1b511af73b00303c536cea0c6c&amp;follow=1'>finished commenting the timer code</a></td><td>mzuther</td><td>2</td><td><span class='deletions'>-46</span>/<span class='insertions'>+138</span></td></tr>
<tr><td><span title='2010-11-20 20:22:05 +0000'>2010-11-20</span></td><td><a href='/lcd4linux.git/commit/timer.h?id=20e4961f9eb3ea712a4d101d5984a6e0e68a23bd&amp;follow=1'>started commenting the timer code</a></td><td>mzuther</td><td>5</td><td><span class='deletions'>-52</span>/<span class='insertions'>+170</span></td></tr>
<tr><td><span title='2010-11-19 09:02:34 +0000'>2010-11-19</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=4447e1d46ca5cdb1839c9ece0426fd26db1b2817&amp;follow=1'>Added brightness support for GLCD2USB</a></td><td>harbaum</td><td>5</td><td><span class='deletions'>-28</span>/<span class='insertions'>+8014</span></td></tr>