php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #38517 imagefilledarc() with alpha blending mode
Submitted: 2006-08-20 08:46 UTC Modified: 2008-11-10 01:00 UTC
Votes:2
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: wkpark at gmail dot com Assigned: pajoye (profile)
Status: No Feedback Package: GD related
PHP Version: 5.1.5 OS: Linux
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: wkpark at gmail dot com
New email:
PHP Version: OS:

 

 [2006-08-20 08:46 UTC] wkpark at gmail dot com 
Description:
------------
there are already similar imagefilledellipse() bug #22103.

but it is not corrected with the imagefilledarc().

the reason why this results are obtained is same as described in #22103.





Reproduce code:
---------------
<?php
$im = imagecreatetruecolor(401, 802);
imagesavealpha($im, true);
imagealphablending($im, false);
imagefilledrectangle($im, 0, 0, 400, 801, 0x7fffffff);
imagealphablending($im, true);
imagefilledarc($im, 200, 200, 400, 400, 30, 270, 0xff0000, 0);
imagefilledarc($im, 200, 601, 400, 400, 30, 270, 0x40ff0000, 0);
imagepng($im, 'test.png');

echo
'<img src="test.png" />';
?>

and the result http://kldp.org/files/test_0.png

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2006-08-20 09:08 UTC] wkpark at kldp dot org 
and this is my first try to fix this problem.

this patch use Bresenham algorithm and some simple trick to make integer based imagefilledarc()

http://chem.skku.ac.kr/~wkpark/linux/patch/php5.x-gd-bresenham3.patch

http://kldp.org/files/gd_try1.png
 [2006-08-21 11:18 UTC] wkpark at gmail dot com 
this is a new patch:
 - CHANGES:
  - fixed winding number exceptions:
http://chem.skku.ac.kr/~wkpark/linux/patch/php5.x-gd-bresenham4.patch
 [2006-08-21 12:16 UTC] pajoye@php.net 
The host where you uploaded the patches is not reachable.

Also please note that I already rewrote this function for both the bundled GD and the normal GD libs. Using an innovative solution, it is nearly as fast as my new ellipse function. I will use the faster version :)

Can you mail me your patch please? Or put it in a reachable post.
 [2006-08-21 13:05 UTC] pajoye@php.net 
Ok, I got your patch now. Not sure why, but your host is not reachable from my ISP (arcor/germany).
 [2008-11-02 12:37 UTC] jani@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/
 [2008-11-10 01:00 UTC] php-bugs at lists dot php dot net 
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Wed Feb 05 06:01:32 2025 UTC