From: panda dot management at free dot fr
Operating system: Windows XP
PHP version: 4.3.5RC3
PHP Bug Type: GD related
Bug description: ImageFillToBorder act weird with alpha channel on alphablending image
Description:
------------
Hello!
ImageFillToBorder seems to act strangely (no output) when using alpha
channel (?) on color and / or bordercolor values, on an alphablending
image.
Configuration:
**************
winxp
apache 2.0.48
php 4.3.4 / 4.3.5RC3
gd2 module loaded
Reproduce code:
---------------
<?php
$im = ImageCreateTrueColor(10, 10);
imagealphablending($im, true);
imagesavealpha($im, false);
$bordercolor=ImageColorAllocateAlpha($im, 0, 0, 0, 2);
$color = ImageColorAllocateAlpha($im, 0, 0, 0, 1);
ImageFillToBorder($im, 5, 5, $bordercolor, $color);
?>
Expected result:
----------------
Do work as supposed to, or output some error.
Actual result:
--------------
Actual result:
**************
Browser hangs and output an alert "Document contains no data".
I'm not experienced enough to give you more debug details... but it
obviously break something...
Additionnal comment:
**************
The values that trigger the bug seems to be pretty much random.
You can reproduce the problem with:
$bordercolor=ImageColorAllocateAlpha($im, 0, 254, 0, 0);
$color = ImageColorAllocateAlpha($im, 0, 255, 255, 75);
Or even reproduce it with:
$bordercolor=ImageColorAllocate($im, 0, 254, 0);
$color = ImageColorAllocateAlpha($im, 0, 255, 255, 75);
(wich is much more logical on an alphablending image...)
But odly it works ok with:
$bordercolor=ImageColorAllocateAlpha($im, 0, 0, 0, 0);
$color = ImageColorAllocateAlpha($im, 0, 255, 255, 75);
I can't find any coherence in the problematic values, except that they
involve alpha channel.
If this is a doc problem, or if I missed something, please forgive this
report...
Anyway, long life to php.
Olivier
--
Edit bug report at http://bugs.php.net/?id=27582&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=27582&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=27582&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=27582&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=27582&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=27582&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=27582&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=27582&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=27582&r=support
Expected behavior: http://bugs.php.net/fix.php?id=27582&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=27582&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=27582&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=27582&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27582&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=27582&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=27582&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=27582&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=27582&r=float