PreviewImage.php

<?php
 
namespace Bitrix\UI\FileUploader;
 
use Bitrix\Main\File\Image;
use Bitrix\Main\File\Image\Rectangle;
 
class PreviewImage
{
    public static function getSize(FileInfo $fileInfo, PreviewImageOptions $options = null): Rectangle
    {
        $previewWidth = 0;
        $previewHeight = 0;
        if ($fileInfo->isImage())
        {
            // Sync with \Bitrix\UI\Controller\FileUploader::previewAction
            $previewWidth = $options ? $options->getWidth() : 300;
            $previewHeight = $options ? $options->getHeight() : 300;
            $previewMode = $options ? $options->getMode() : Image::RESIZE_PROPORTIONAL;
 
            $destinationRectangle = new Rectangle($previewWidth, $previewHeight);
            $sourceRectangle = new Rectangle($fileInfo->getWidth(), $fileInfo->getHeight());
            $needResize = $sourceRectangle->resize($destinationRectangle, $previewMode);
            if ($needResize)
            {
                $previewWidth = $destinationRectangle->getWidth();
                $previewHeight = $destinationRectangle->getHeight();
            }
            else
            {
                $previewWidth = $sourceRectangle->getWidth();
                $previewHeight = $sourceRectangle->getHeight();
            }
        }
 
        return new Rectangle($previewWidth, $previewHeight);
    }
}