Doc #64472 [NEW]: Flip-flipped argument handling not documented
From: psmith at gurutechnologies dot net
Operating system: Ubuntu
PHP version: Irrelevant
Package: imagick
Bug Type: Documentation Problem
Bug description:Flip-flipped argument handling not documented
Description:
------------
---
From manual page: http://www.php.net/imagick.extentimage
---
Undocumented flip-flop in argument interpretation on
Imagick::extentImage(int $width, int $height, int $x, int $y):
Prior to ImageMagick 6.5.7-8 (1623), $x was positive when shifting to the
left and negative when shifting to the right, and $y was positive when
shifting an image up and negative when shifting an image down.
Somewhere betwen ImageMagick 6.3.7 (1591) and ImageMagick 6.5.7-8 (1623),
the axes of $x and $y were flipped, so that $x was negative when shifting
to the left and positive when shifting to the right, and $y was negative
when shifting an image up and positive when shifting an image down.
Somewhere between ImageMagick 6.5.7-8 (1623) and ImageMagick 6.6.9-7
(1641), the axes of $x and $y were flipped back to pre-ImageMagick 6.5.7-8
(1623) functionality.
Test script:
---------------
<?php
$imagick = new Imagick();
$imagick_version = $imagick->getVersion();
if($imagick_version['versionNumber'] == 1623)
$pos_factor = 1;
else
$pos_factor = -1;
$imagick->readImage($path_to_some_image_to_center);
$imagick->resizeImage($new_width, $new_height, imagick::FILTER_LANCZOS,
1);
$imagick->setImageBackgroundColor(new ImagickPixel('#000000'));
$imagick->extentImage($max_width, $max_height, $pos_factor * ($max_width -
$new_width) / 2, $pos_factor * ($max_height - $new_height) / 2);
?>
Expected result:
----------------
Using the above code to scale and fit image, centered, into an incongruent
container should result in a properly centered image.
Actual result:
--------------
If $x and $y do not use the signs (positive or negative) expected by the
installed version of Imagick, the image is shifted in the wrong direction!
This should be noted in the documentation as a warning.
--
Edit bug report at https://bugs.php.net/bug.php?id=64472&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=64472&r=trysnapshot54
Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=64472&r=trysnapshot53
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=64472&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=64472&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=64472&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=64472&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=64472&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=64472&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=64472&r=support
Expected behavior: https://bugs.php.net/fix.php?id=64472&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=64472&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=64472&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=64472&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=64472&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=64472&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=64472&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=64472&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=64472&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=64472&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=64472&r=mysqlcfg
Thread (2 messages)
- psmith at gurutechnologies dot net