<?php
    class ImageProcessor
    {
        protected $I;
        function __construct($Gd = null)
        {
            if($Gd)
                $this->I = $Gd;
        }

        public function LoadFile($Path)
        {
            $Data = @getimagesize($Path);
            if(!$Data)
                return 0;
            if($Data[2] == IMAGETYPE_JPEG)
            {
                $this->I = imagecreatefromjpeg($Path);
                return 1;
            }
            if($Data[2] == IMAGETYPE_PNG)
            {
                $this->I = imagecreatefrompng($Path);
                return 2;
            }
            return 0;
        }

        public function LoadPngString($String)
        {
            $InFile = tempnam(sys_get_temp_dir(), 'TmpImg_');
            file_put_contents($InFile, $String);
            $this->I = imagecreatefrompng($InFile);
            unlink($InFile);
        }

        public function W()
        {
            return imagesx($this->I);
        }
        public function H()
        {
            return imagesy($this->I);
        }
        public function Aspect()
        {
            return $this->W() / $this->H();
        }

        public function MinSize($W, $H)
        {
            if($this->W() < $W || $this->H() < $H)
                return 0;
            return 1;
        }
        public function MaxSize($W, $H)
        {
            if($this->W() > $W || $this->H() > $H)
                return 0;
            return 1;
        }




        public function ResizeWPreserve($Wn)
        {
            $Wo = $this->W();
            $Ho = $this->H();

            if($Wn == $Wo)
                return $this;

            $Hn = round($Wn * $Ho / $Wo);

            $N = imagecreatetruecolor($Wn, $Hn);
            imagecopyresampled($N, $this->I, 0, 0, 0, 0, $Wn, $Hn, $Wo, $Ho);

            return new ImageProcessor($N);
        }
        public function ResizeHPreserve($Hn)
        {
            $Wo = $this->W();
            $Ho = $this->H();

            if($Hn == $Ho)
                return $this;

            $Wn = round($Hn * $Wo / $Ho);

            $N = imagecreatetruecolor($Wn, $Hn);
            imagecopyresampled($N, $this->I, 0, 0, 0, 0, $Wn, $Hn, $Wo, $Ho);

            return new ImageProcessor($N);
        }

        public function ResizeCanvas($Wn, $Hn)
        {
            $Wo = $this->W();
            $Ho = $this->H();

            //if($Wo < $Wn || $Ho < $Hn)
            //  return 0; //Za małe


            $N = imagecreatetruecolor($Wn, $Hn);
            $BG = imagecolorallocate($N, 0, 0, 0);
            imagefill($N, 0, 0, $BG);

            if(($Wo == $Wn && $Ho == $Hn) || $Wo / $Ho == $Wn / $Hn)
            {
                imagecopyresampled($N, $this->I, 0, 0, 0, 0, $Wn, $Hn, $Wo, $Ho);
            }
            if(($Wo / $Ho) < ($Wn / $Hn))
            {
                $R = $Wo / $Ho;
                $Ww = $R * $Hn; //Szerokosc wycinka
                $Wd = round(($Wn - $Ww) / 2);

                imagecopyresampled($N, $this->I, $Wd, 0, 0, 0, $Ww, $Hn, $Wo, $Ho);
            }
            else
            {
                //Paski gora i dol
                $R = $Wo / $Ho;
                $Hw = round($Wn / $R); // Wysokosc wycinka
                $Hd = round(($Hn - $Hw) / 2);

                imagecopyresampled($N, $this->I, 0, $Hd, 0, 0, $Wn, $Hw, $Wo, $Ho);
            }

            return new ImageProcessor($N);
        }
        public function Cut($W, $H, $X, $Y)
        {
            $N = imagecreatetruecolor($W, $H);
            imagecopy($N, $this->I, 0, 0, $X, $Y, $this->W(), $this->H());
            return new ImageProcessor($N);
        }
        public function Fetch()
        {
            $F = $this->Save();
            $D = file_get_contents($F);
            unlink($F);
            return $D;
        }
        public function Save($OutFile = '')
        {
            if(!$OutFile)
                $OutFile = tempnam(sys_get_temp_dir(), 'TmpImg_');
            imagepng($this->I, $OutFile);
            return $OutFile;
        }
    }
?>