On 16.11.2021 at 13:11, Côme Chilliet wrote:
> I have a difference in behavior between PHP 8.1 RC6 and my system PHP for the
> function imagettfbbox.
> It is hard to know if this is a problem with 8.1 really because I had to
> download and build imagick through pecl to be able to run this.
imagettfbbox() is part of ext/gd which is a bundled extension. It has
nothing to do with imagick (besides both are for image manipulation).
> <?php
> $font = '/usr/share/fonts/truetype/noto/NotoSans-Regular.ttf';
> var_dump(imagettfbbox(12, 0, $font, 'E'));
>
> The result for running this is:
> $ ~/dev/php-src-git/sapi/cli/php ~/dev/test-freetype.php
> array(8) {
> [0]=>
> int(1)
> [1]=>
> int(0)
> [2]=>
> int(8)
> [3]=>
> int(0)
> [4]=>
> int(8)
> [5]=>
> int(-12)
> [6]=>
> int(1)
> [7]=>
> int(-12)
> }
> $ php ~/dev/test-freetype.php
> array(8) {
> [0]=>
> int(0)
> [1]=>
> int(1)
> [2]=>
> int(10)
> [3]=>
> int(1)
> [4]=>
> int(10)
> [5]=>
> int(-12)
> [6]=>
> int(0)
> [7]=>
> int(-12)
> }
>
> As you can see the resulting bounding box is not the same, for the same font.
> This messes up our avatar generation, which ends up a few pixels wrong on the
> centering of the initial in the image.
>
> Does anyone knows where this can come from, and if by changing how I
> build/link imagick I can get the same result on both binaries?
This might be due to different libfreetype, libgd or libraqm versions
(or possibly libraqm wasn't enabled for one of the builds), or because
one build used system libgd and the other used the bundled GD.
--
Christoph M. Becker
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