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GdThumbGenerator.php: add GdThumbGenerator

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Zankaria 2025-03-18 00:41:04 +01:00
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commit 551c366e6c
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inc/Service/Media/GdThumbGenerator.php Normal file
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<?php
namespace Vichan\Service\Media;
use Vichan\Data\ThumbGenerationResult;
use function Vichan\Functions\Fs\link_or_copy;
class GdThumbGenerator implements ThumbGenerator {
private const PHP81 = PHP_MAJOR_VERSION >= 8 && PHP_MINOR_VERSION >= 1;
private const MIME_TO_EXT = [
'image/jpeg' => 'jpg',
'image/png' => 'png',
'image/gif' => 'gif',
'image/webp' => 'webp',
'image/bmp' => 'bmp',
'image/avif' => 'avif'
];
private static function imageCreateFrom(string $file, string $mime): mixed {
switch ($mime) {
case 'image/jpeg':
return imagecreatefromjpeg($file);
case 'image/png':
return imagecreatefrompng($file);
case 'image/gif':
return imagecreatefromgif($file);
case 'image/webp':
return imagecreatefromwbmp($file);
case 'image/bmp':
return imagecreatefrombmp($file);
case 'image/avif':
return self::PHP81 ? imagecreatefromavif($file) : false;
}
return false;
}
public static function imageSaveTo(mixed $gd, string $file, string $mime) {
// Somebody should tune the quality and speed values...
switch ($mime) {
case 'image/jpeg':
return imagejpeg($gd, $file, 50);
case 'image/png':
return imagepng($gd, $file, 7);
case 'image/gif':
return imagegif($gd, $file);
case 'image/webp':
return imagewbmp($gd, $file, 50);
case 'image/bmp':
return imagebmp($gd, $file, true);
case 'image/avif':
return self::PHP81 ? imageavif($gd, $file, 30, 6) : false;
}
return false;
}
private static function createCanvas(string $mime, int $width, int $height) {
$gd = \imagecreatetruecolor($width, $height);
switch ($mime) {
case 'image/png':
imagecolortransparent($gd, imagecolorallocatealpha($gd, 0, 0, 0, 0));
imagesavealpha($gd, true);
imagealphablending($gd, false);
break;
case 'image/gif':
\imagecolortransparent($gd, \imagecolorallocatealpha($gd, 0, 0, 0, 0));
\imagesavealpha($gd, true);
break;
}
return $gd;
}
public function supportsMime(string $mime): bool {
$info = \gd_info();
return ($mime === 'image/jpeg' && $info['JPEG Support'])
|| ($mime === 'image/png' && $info['PNG Support'])
|| ($mime === 'image/gif' && $info['GIF Read Support'] && $info['GIF Create Support'])
|| ($mime === 'image/webp' && $info['WebP Support'])
|| $mime === 'image/bmp'
|| ($mime === 'image/avif' && self::PHP81 && $info['AVIF Support']);
}
public function generateThumb(
string $source_file_path,
string $source_file_mime,
string $preferred_out_file_path,
string $preferred_out_mime,
int $max_width,
int $max_height
): ThumbGenerationResult {
$gd = self::imageCreateFrom($source_file_path, $source_file_mime);
if ($gd === false) {
throw new \RuntimeException("Could not open '$source_file_path'");
}
$width = \imagesx($gd);
$height = \imagesy($gd);
if ($width <= $max_width && $height <= $max_height) {
$out_path = $preferred_out_file_path . '.' . self::MIME_TO_EXT[$source_file_mime];
if (!link_or_copy($source_file_path, $out_path)) {
throw new \RuntimeException("Could not link or copy '$source_file_path' to '$out_path'");
}
$res = new ThumbGenerationResult();
$res->thumb_file_path = $out_path;
$res->thumb_mime = $source_file_mime;
$res->is_thumb_file_temporary = false;
$res->width = $width;
$res->height = $height;
return $res;
} else {
$out_path = $preferred_out_file_path . '.' . self::MIME_TO_EXT[$preferred_out_mime];
$gd_other = self::createCanvas($preferred_out_mime, $max_width, $max_height);
\imagecopyresampled($gd_other, $gd, 0, 0, 0, 0, $max_width, $max_height, $width, $height);
if (!self::imageSaveTo($gd_other, $out_path, $preferred_out_mime)) {
throw new \RuntimeException("Could not create thumbnail file at '$out_path'");
}
$res = new ThumbGenerationResult();
$res->thumb_file_path = $out_path;
$res->thumb_mime = $preferred_out_mime;
$res->is_thumb_file_temporary = false;
$res->width = $max_width;
$res->height = $max_height;
return $res;
}
}
}