From: lbayuk at pobox dot com
Operating system: Linux
PHP version: 5.2.4
PHP Bug Type: GD related
Bug description: TrueType bounding box is wrong for angle<>0
Description:
------------
The bounding box returned from imagettfbbox() and imagettftext() is
incorrect for anything except horizontal text at 0 degrees. For all other
angles, the text is partially or completely outside the returned bounding
box. (Yes, somebody reported the same problem in #37730, but that was
marked "no feedback" and is not getting any attention. Could someone
please-please look at this issue?) The PHP script below demonstrates. Using
the bundled GD library, and any TrueType font.
Change $font to point to any TrueType font file you have.
Run via PHP CLI, sending out to filename.png and view, or access via
browser.
I wrote an equivalent C program with gd-2.0.35 (Slackware 12.0 Linux
distribution), and the bounding boxes are correct. So there is probably
something wrong in the GD library bundled with PHP.
Reproduce code:
---------------
<?php
$font = '/usr/share/fonts/TTF/luximr.ttf'; # Full path to any TTF Font
$delta_t = 360.0 / 16; # Make 16 steps around
$g = imagecreate(800, 800);
$bgnd = imagecolorallocate($g, 255, 255, 255);
$black = imagecolorallocate($g, 0, 0, 0);
$x = 100;
$y = 0;
$cos_t = cos(deg2rad($delta_t));
$sin_t = sin(deg2rad($delta_t));
for ($angle = 0.0; $angle < 360.0; $angle += $delta_t) {
$bbox = imagettftext($g, 24, $angle, 400+$x, 400+$y, $black, $font,
'ABCDEF');
imagepolygon($g, $bbox, 4, $black);
imagefilledellipse($g, $bbox[0], $bbox[1], 8, 8, $black);
$temp = $cos_t * $x + $sin_t * $y;
$y = $cos_t * $y - $sin_t * $x;
$x = $temp;
}
header("Content-type: image/png");
imagepng($g);
Expected result:
----------------
In the image output: For each angle of text, the box should enclose the
text, with the dot to the lower left (relative to the text baseline) of the
first character in the string.
Actual result:
--------------
The bounding box for 0 degree text is correct. All the others are off by
different amounts. Worst is the text between 180 and 270 degrees, where the
text is completely outside the bounding box.
--
Edit bug report at http://bugs.php.net/?id=43073&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=43073&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=43073&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=43073&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=43073&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=43073&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=43073&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=43073&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=43073&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=43073&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=43073&r=support
Expected behavior: http://bugs.php.net/fix.php?id=43073&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=43073&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=43073&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=43073&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=43073&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=43073&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=43073&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=43073&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=43073&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=43073&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=43073&r=mysqlcfg
