Edit report at https://bugs.php.net/bug.php?id=65148&edit=1
ID: 65148
Comment by: erwin at burorader dot com
Reported by: imprec at gmail dot com
Summary: imagerotate may alter image dimensions
Status: Open
Type: Bug
Package: GD related
Operating System: Linux
PHP Version: 5.5.0
Block user comment: N
Private report: N
New Comment:
Same on Zend Server CE on Windows with PHP Version 5.5.7 (GD Version: bundled (2.1.0 compatible)).
I used this as test script:
<?php
$interpolations = array(
'IMG_BELL' => IMG_BELL,
'IMG_BESSEL' => IMG_BESSEL,
'IMG_BICUBIC' => IMG_BICUBIC,
'IMG_BICUBIC_FIXED' => IMG_BICUBIC_FIXED,
'IMG_BILINEAR_FIXED' => IMG_BILINEAR_FIXED,
'IMG_BLACKMAN' => IMG_BLACKMAN,
'IMG_BOX' => IMG_BOX,
'IMG_BSPLINE' => IMG_BSPLINE,
'IMG_CATMULLROM' => IMG_CATMULLROM,
'IMG_GAUSSIAN' => IMG_GAUSSIAN,
'IMG_GENERALIZED_CUBIC' => IMG_GENERALIZED_CUBIC,
'IMG_HERMITE' => IMG_HERMITE,
'IMG_HAMMING' => IMG_HAMMING,
'IMG_HANNING' => IMG_HANNING,
'IMG_MITCHELL' => IMG_MITCHELL,
'IMG_POWER' => IMG_POWER,
'IMG_QUADRATIC' => IMG_QUADRATIC,
'IMG_SINC' => IMG_SINC,
'IMG_NEAREST_NEIGHBOUR' => IMG_NEAREST_NEIGHBOUR,
'IMG_WEIGHTED4' => IMG_WEIGHTED4,
'IMG_TRIANGLE' => IMG_TRIANGLE,
);
$img = imagecreatefrompng('image-test.png');
$results = array();
foreach($interpolations as $name => $interpolation) {
imagesetinterpolation($img, $interpolation);
$t = imagecolorallocatealpha($img, 0, 0, 0, 127);
$imgr = imagerotate($img, -5, $t);
$results[$name] = array('x' => imagesx($imgr), 'y' => imagesy($imgr));
imagedestroy($imgr);
}
print_r($results);
imagedestroy($img);
?>
Results:
Array
(
[IMG_BELL] => Array
(
[x] => 40
[y] => 22
)
[IMG_BESSEL] => Array
(
[x] => 40
[y] => 22
)
[IMG_BICUBIC] => Array
(
[x] => 40
[y] => 22
)
[IMG_BICUBIC_FIXED] => Array
(
[x] => 41
[y] => 23
)
[IMG_BILINEAR_FIXED] => Array
(
[x] => 41
[y] => 23
)
[IMG_BLACKMAN] => Array
(
[x] => 40
[y] => 22
)
[IMG_BOX] => Array
(
[x] => 40
[y] => 22
)
[IMG_BSPLINE] => Array
(
[x] => 40
[y] => 22
)
[IMG_CATMULLROM] => Array
(
[x] => 40
[y] => 22
)
[IMG_GAUSSIAN] => Array
(
[x] => 40
[y] => 22
)
[IMG_GENERALIZED_CUBIC] => Array
(
[x] => 40
[y] => 22
)
[IMG_HERMITE] => Array
(
[x] => 40
[y] => 22
)
[IMG_HAMMING] => Array
(
[x] => 40
[y] => 22
)
[IMG_HANNING] => Array
(
[x] => 40
[y] => 22
)
[IMG_MITCHELL] => Array
(
[x] => 40
[y] => 22
)
[IMG_POWER] => Array
(
[x] => 40
[y] => 22
)
[IMG_QUADRATIC] => Array
(
[x] => 40
[y] => 22
)
[IMG_SINC] => Array
(
[x] => 40
[y] => 22
)
[IMG_NEAREST_NEIGHBOUR] => Array
(
[x] => 40
[y] => 22
)
[IMG_WEIGHTED4] => Array
(
[x] => 40
[y] => 22
)
[IMG_TRIANGLE] => Array
(
[x] => 40
[y] => 22
)
)
Notes:
1) On PHP 5.4 it used to be 42 x 23 (it is a test case for Drupal: https://www.drupal.org/node/2215369).
2) The size can even be 2 off, depending on the interpolation setting.
3) I found that positive multiples of 90 degrees work correct, negative multiples are off by 1.
Previous Comments:
------------------------------------------------------------------------
[2013-06-28 08:54:03] imprec at gmail dot com
I tested and reproduced the issue with PHP55-201306280830
------------------------------------------------------------------------
[2013-06-27 20:25:31] pajoye@php.net
Please try 5.5 snapshots, this bug should be gone.
------------------------------------------------------------------------
[2013-06-27 14:12:26] imprec at gmail dot com
Description:
------------
When rotating image with GD, image dimension may be different after the rotation.
For example, I expect a 320x240 image to be 240x320 after rotation. It may be
239x320.
Test script:
---------------
This bug happens with the following script :
(google.png file can be retrieved from https://raw.github.com/avalanche123/Imagine/develop/tests/Imagine/Fixtures/google.png)
$resource = imagecreatefrompng('google.png');
var_dump(imagesx($resource));
$resource = imagerotate($resource, -90, 0);
var_dump(imagesy($resource));
Expected result:
----------------
int(364)
int(364)
Actual result:
--------------
int(364)
int(363)
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=65148&edit=1