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Bug #64898 imagerotate is broken
Submitted: 2013-05-22 10:43 UTC Modified: 2013-05-28 09:33 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: douglas dot wright at pre-school dot org dot uk Assigned: pajoye (profile)
Status: Closed Package: GD related
PHP Version: 5.5.0RC1 OS: Windows 7
Private report: No CVE-ID: None
View Developer Edit
 [2013-05-22 10:43 UTC] douglas dot wright at pre-school dot org dot uk 
Description:
------------
When attempting to rotate an image using PHP5.5RC1, the output is corrupted. This is a regression from latest stable PHP 5.4

Test script:
---------------
<?php

$source = imagecreatefrompng('original.png');
$rotate = imagerotate($source, 45, imagecolorallocate($source,255,255,255));
imagepng($rotate, 'rotated.png');

Expected result:
----------------
Please see comparison screenshot at http://tinypic.com/r/34t8qdu/5 

Actual result:
--------------
Please see comparison screenshot at http://tinypic.com/r/34t8qdu/5

Patches

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 [2013-05-22 12:46 UTC] pajoye@php.net
-Status: Open +Status: Feedback
 [2013-05-22 12:46 UTC] pajoye@php.net 
Do you have the original image please? You can use tinypic too but I need the 
original images.
 [2013-05-22 12:54 UTC] douglas dot wright at pre-school dot org dot uk
-Status: Feedback +Status: Open
 [2013-05-22 12:54 UTC] douglas dot wright at pre-school dot org dot uk 
Sure, the one I used in the testcase is https://www.pre-school.org.uk/publicationimage/236/thumbnail/?size=200
 [2013-05-26 23:37 UTC] pajoye@php.net
-Status: Open +Status: Assigned -Assigned To: +Assigned To: pajoye
 [2013-05-26 23:49 UTC] pajoye@php.net 
Reproduced. Have to figure out what went wrong lately with the bilinear 
interpolation and the rotate function.

As a work around, add:

imagesetinterpolation($source, IMG_BICUBIC_FIXED); // or any prefered algorithm

before the imagerotate call.
 [2013-05-27 07:22 UTC] pajoye@php.net 
Automatic comment on behalf of pierre.php@gmail.com
Revision: http://git.php.net/?p=php-src.git;a=commit;h=2f01e06786c6f4b2479fdb728bd26062d07208e0
Log: fix #64898imagerotate is broken with bilinear interpolation
 [2013-05-27 07:23 UTC] pajoye@php.net 
The fix for this bug has been committed.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.

 For Windows:

http://windows.php.net/snapshots/
 
Thank you for the report, and for helping us make PHP better.
 [2013-05-27 07:23 UTC] pajoye@php.net
-Status: Assigned +Status: Closed
 [2013-05-28 09:33 UTC] douglas dot wright at pre-school dot org dot uk 
Fix confirmed. Many thanks.
 [2013-11-17 09:31 UTC] laruence@php.net 
Automatic comment on behalf of pierre.php@gmail.com
Revision: http://git.php.net/?p=php-src.git;a=commit;h=2f01e06786c6f4b2479fdb728bd26062d07208e0
Log: fix #64898imagerotate is broken with bilinear interpolation
 
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