BasicImageHelperWithGD.php

<?php
/**
 * Project codeigniter-basic-helper
 * Created by PhpStorm
 * User: 713uk13m <dev@nguyenanhung.com>
 * Copyright: 713uk13m <dev@nguyenanhung.com>
 * Date: 12/02/2023
 * Time: 23:05
 */

namespace nguyenanhung\CodeIgniter\BasicHelper;

class BasicImageHelperWithGD
{
    protected $image;

    protected $imageFormat;

    public function load($imageFile)
    {
        $imageInfo = getImageSize($imageFile);
        $this->imageFormat = $imageInfo[2];

        if ($this->imageFormat === IMAGETYPE_JPEG) {
            $this->image = imagecreatefromjpeg($imageFile);
        } elseif ($this->imageFormat === IMAGETYPE_GIF) {
            $this->image = imagecreatefromgif($imageFile);
        } elseif ($this->imageFormat === IMAGETYPE_PNG) {
            $this->image = imagecreatefrompng($imageFile);
        }
    }

    public function save($imageFile, $imageFormat = IMAGETYPE_JPEG, $compression = 75, $permissions = null)
    {
        if ($imageFormat == IMAGETYPE_JPEG) {
            imagejpeg($this->image, $imageFile, $compression);
        } elseif ($imageFormat == IMAGETYPE_GIF) {
            imagegif($this->image, $imageFile);
        } elseif ($imageFormat == IMAGETYPE_PNG) {
            imagepng($this->image, $imageFile);
        }
        if ($permissions != null) {
            chmod($imageFile, $permissions);
        }
    }

    public function getWidth()
    {
        return imagesx($this->image);
    }

    public function getHeight()
    {
        return imagesy($this->image);
    }

    public function resizeToHeight($height)
    {
        $ratio = $height / $this->getHeight();
        $width = $this->getWidth() * $ratio;
        $this->resized($width, $height);
    }

    public function resizeToWidth($width)
    {
        $ratio = $width / $this->getWidth();
        $height = $this->getheight() * $ratio;
        $this->resized(
            $width,
            $height
        );
    }

    public function scale($scale)
    {
        $width = $this->getWidth() * $scale / 100;
        $height = $this->getheight() * $scale / 100;
        $this->resized(
            $width,
            $height
        );
    }

    protected function resized($width, $height)
    {
        $newImage = imagecreatetruecolor($width, $height);
        imagecopyresampled(
            $newImage,
            $this->image,
            0,
            0,
            0,
            0,
            $width,
            $height,
            $this->getWidth(),
            $this->getHeight()
        );
        $this->image = $newImage;
    }
}