77 lines
2.1 KiB
PHP
77 lines
2.1 KiB
PHP
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<?php
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declare(strict_types=1);
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/**
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* Responsive Bild-Varianten erzeugen (GD, läuft auch auf Shared Hosting).
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*
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* Resize (proportional auf Zielbreiten):
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* php bin/img-resize.php <quelle> <ziel-basis> <breite>[,<breite>...] [qualität=78]
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* → ziel-basis-<breite>.jpg je Breite
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*
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* Crop (exaktes Format, mittig beschnitten, z.B. OG-Image):
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* php bin/img-resize.php --crop <quelle> <ziel.jpg> <breite>x<höhe> [qualität=78]
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*/
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if (PHP_SAPI !== 'cli') {
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exit(1);
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}
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$args = array_slice($argv, 1);
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$crop = false;
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if (($args[0] ?? '') === '--crop') {
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$crop = true;
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array_shift($args);
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}
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if (count($args) < 3) {
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fwrite(STDERR, "Nutzung: siehe Datei-Kommentar\n");
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exit(1);
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}
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[$src, $dest, $spec] = $args;
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$quality = (int) ($args[3] ?? 78);
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$image = match (strtolower(pathinfo($src, PATHINFO_EXTENSION))) {
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'jpg', 'jpeg' => imagecreatefromjpeg($src),
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'png' => imagecreatefrompng($src),
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'webp' => imagecreatefromwebp($src),
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default => null,
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};
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if (!$image) {
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fwrite(STDERR, "Kann Quelle nicht lesen: {$src}\n");
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exit(1);
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}
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$srcW = imagesx($image);
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$srcH = imagesy($image);
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if ($crop) {
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[$w, $h] = array_map('intval', explode('x', $spec));
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$srcRatio = $srcW / $srcH;
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$dstRatio = $w / $h;
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if ($srcRatio > $dstRatio) {
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$cropH = $srcH;
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$cropW = (int) round($srcH * $dstRatio);
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} else {
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$cropW = $srcW;
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$cropH = (int) round($srcW / $dstRatio);
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}
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$x = (int) (($srcW - $cropW) / 2);
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$y = (int) (($srcH - $cropH) / 2);
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$out = imagecreatetruecolor($w, $h);
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imagecopyresampled($out, $image, 0, 0, $x, $y, $w, $h, $cropW, $cropH);
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imagejpeg($out, $dest, $quality);
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echo "{$dest} ({$w}x{$h})\n";
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exit(0);
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}
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foreach (explode(',', $spec) as $width) {
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$w = min((int) $width, $srcW); // nie hochskalieren
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$h = (int) round($srcH * $w / $srcW);
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$out = imagecreatetruecolor($w, $h);
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imagecopyresampled($out, $image, 0, 0, 0, 0, $w, $h, $srcW, $srcH);
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$file = "{$dest}-{$w}.jpg";
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imagejpeg($out, $file, $quality);
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echo "{$file} ({$w}x{$h}, " . round(filesize($file) / 1024) . " KB)\n";
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}
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