95 lines
3 KiB
PHP
95 lines
3 KiB
PHP
<?php
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namespace BookStack\Uploads;
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use BookStack\Exceptions\ImageUploadException;
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use GuzzleHttp\Psr7\Utils;
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use Intervention\Image\Exception\NotSupportedException;
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use Intervention\Image\Image as InterventionImage;
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use Intervention\Image\ImageManager;
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class ImageResizer
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{
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public function __construct(
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protected ImageManager $intervention
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) {
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}
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/**
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* Resize the image of given data to the specified size, and return the new image data.
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*
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* @throws ImageUploadException
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*/
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protected function resizeImageData(string $imageData, ?int $width, ?int $height, bool $keepRatio): string
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{
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try {
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$thumb = $this->intervention->make($imageData);
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} catch (NotSupportedException $e) {
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throw new ImageUploadException(trans('errors.cannot_create_thumbs'));
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}
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$this->orientImageToOriginalExif($thumb, $imageData);
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if ($keepRatio) {
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$thumb->resize($width, $height, function ($constraint) {
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$constraint->aspectRatio();
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$constraint->upsize();
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});
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} else {
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$thumb->fit($width, $height);
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}
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$thumbData = (string) $thumb->encode();
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// Use original image data if we're keeping the ratio
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// and the resizing does not save any space.
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if ($keepRatio && strlen($thumbData) > strlen($imageData)) {
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return $imageData;
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}
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return $thumbData;
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}
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/**
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* Orientate the given intervention image based upon the given original image data.
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* Intervention does have an `orientate` method but the exif data it needs is lost before it
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* can be used (At least when created using binary string data) so we need to do some
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* implementation on our side to use the original image data.
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* Bulk of logic taken from: https://github.com/Intervention/image/blob/b734a4988b2148e7d10364b0609978a88d277536/src/Intervention/Image/Commands/OrientateCommand.php
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* Copyright (c) Oliver Vogel, MIT License.
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*/
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protected function orientImageToOriginalExif(InterventionImage $image, string $originalData): void
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{
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if (!extension_loaded('exif')) {
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return;
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}
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$stream = Utils::streamFor($originalData)->detach();
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$exif = @exif_read_data($stream);
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$orientation = $exif ? ($exif['Orientation'] ?? null) : null;
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switch ($orientation) {
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case 2:
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$image->flip();
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break;
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case 3:
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$image->rotate(180);
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break;
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case 4:
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$image->rotate(180)->flip();
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break;
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case 5:
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$image->rotate(270)->flip();
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break;
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case 6:
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$image->rotate(270);
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break;
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case 7:
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$image->rotate(90)->flip();
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break;
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case 8:
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$image->rotate(90);
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break;
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}
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}
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}
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