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<?php
namespace Brendt\Image\Scaler;
use Intervention\Image\Image;
use Symfony\Component\Finder\SplFileInfo;
class FileSizeScaler extends AbstractScaler
{
/**
* @param SplFileInfo $sourceFile
* @param Image $imageObject
*
* @return array
*/
public function scale(SplFileInfo $sourceFile, Image $imageObject) : array {
$fileSize = $sourceFile->getSize();
$width = $imageObject->getWidth();
$height = $imageObject->getHeight();
$ratio = $height / $width;
$area = $width * $width * $ratio;
$pixelPrice = $fileSize / $area;
$sizes = [];
do {
// Magic formula.
$newWidth = floor(sqrt(($fileSize / $pixelPrice) / $ratio));
$sizes[(int) $newWidth] = (int) $newWidth * $ratio;
$fileSize = $fileSize * $this->stepModifier;
} while ($fileSize > $this->minFileSize && $newWidth > $this->minWidth);
return $sizes;
}
brendt /
responsive-images
