GD.pm A perl5 interface to Thomas Boutell's gd library.
Modified ever so slightly for use in Win32 Perl by
Dave Roth <
[email protected]> or <
[email protected]>
ABSTRACT:
This is a autoloadable interface module for libgd, a popular library
for creating and manipulating GIF files. With this library you can
create GIF images on the fly or modify existing files. Features
include:
a. lines, polygons, rectangles and arcs, both filled and unfilled
b. flood fills
c. the use of arbitrary images as brushes and as tiled fill patterns
d. line styling (dashed lines and the like)
e. horizontal and vertical text rendering
f. support for transparency and interlacing
For full information on usage, see the accompanying man and html
documentation.
COPYRIGHT INFO
The GD.pm interface is copyright 1995, Lincoln D. Stein. You are free
to use it for any purpose, commercial or noncommercial, provided that
if you redistribute the source code this statement of copyright
remains attached. The Gd library is covered separately, under a 1994
copyright by Quest Protein Database Center, Cold Spring Harbor Labs.
For usage information see the Gd documentation at the URL given below.
T O I N S T A L L T H I S B E A S T :
=========================================
1) You will need to dump the GD.PM file into the \PERL\LIB\ directory.
2) You need to copy GD106.PLL into \PERL\LIB\AUTO\GD\ directory then
rename the file to GD.PLL.
This particular implimentation requires Win32 Perl with a build
number of 106 or higher.
Run: perl -v to check which build number you have.
**** Notice that we are changing the name to GD.PLL!!!!
---------------------------------------------------------
That is it!
After all that is finished, try it out and run:
perl test.pl
A GIF file should dump to your screen!
You can try:
perl test.pl "c:\temp\temp.gif"
The same GIF file will be saved as c:\temp\temp.gif
****NOTICE: This extension has been not been tested
**** very well. I claim no responsiblity for
any damages that may occur due to this
code. I have seen this cause runtime
errors on some GIF files. I suspect that
the original GD code suffers from some
fragility on some GIF formats.
===========================================
==== CHANGES FROM STEIN'S WORK ======
==== ======
If you are porting from Unix under Stein's
version of this same module please note
that there are just a couple of changes:
1) You really should set $| to 1 so
that printed data is flushed out.
This is because the GD library
was altered a bit to contend with
Win32 Perl and MSVC 2.2.
2) The gif() and gd() methods take
parameters and do NOT return the
image data!!!!!
Stein's methods return image data
that you can redirect to a file but
since Win32 Perl can not yet use
the fork() things are a bit different.
Proper useage:
$gif->gif;
will print the image data to STDOUT.
$gif->gif("c:\\temp\\test.gif");
will dump the image data to the
specified file.
3) Also note that the gif() and gd()
methods also return a value of 1
if successfull and 0 if failure.
Success is the specified file to
save to was indeed opened for writing.
4) When using the newFromGif() or newFromGD()
methods you must first open the file and
then set it to binary mode!!! Apparently
Win32 Perl open files in text mode; very bad
for Gif processing.
Proper useage:
open(FILE, "< c:\\temp\\test.gif") || die;
binmode FILE;
$im = newFromGif GD::Image(FILE) || die;
===============================================
This work is a hack on excellent work done by:
Lincoln Stein
[email protected]
http://www-genome.wi.mit.edu/~lstein
