imagick: install libheif-plugin-aomenc on Debian 13+ for AVIF support

[lenlorijn]

On Debian 13 the libheif1 codecs were split into separate plugin packages, so imagick images no longer include an AV1 encoder and ImageMagick can't write AVIF. This adds libheif-plugin-aomenc on Debian 13+; bookworm and Alpine are unaffected afaik.

Test: imagick

[mlocati]

Do you know any quick way to check if imagick can write AVIF? It seems that Imagick::queryFormats() includes 'AVIF' even on debian 13+ without libheif-plugin-aomenc...

[lenlorijn]

Yes no problem. The platform check we use uses the following code:

try {
    $imagick = new Imagick();
    $imagick->newImage(10, 10, new ImagickPixel('red'));
    $imagick->setImageFormat('avif');
    $writeBytes = strlen($imagick->getImageBlob());
    $imagick->clear();
} catch (\Throwable $e) {
    $writeError = $e->getMessage();
}

The version string should also have changed I believe.

$versionString = (new Imagick())->getVersion()['versionString'] ?? '';
$hasAom = stripos($versionString, 'aom') !== false;

[mlocati]

Thanks!

[mlocati]

In #1277 we also check for write support, and indeed this #1275 fixes the issue: compare

• https://github.com/mlocati/docker-php-extension-installer/actions/runs/24777040860 (before this fix)
• https://github.com/mlocati/docker-php-extension-installer/actions/runs/24789882497 (after this fix)