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 | <?php
	$dossier = 'philtre/';
	$newfichier = 'noirblanc.bmp';
 
	class Bmp32BitsCarib0uClass {
	private $filename = 'upload/image.bmp';
	private $handle   = null;
	private $infos    = array();
 
	function __construct($name) {
		$this->filename = $name;
		if($this->is_bmp()) {
			$this->infos['taille'] = $this->reading_val(4);
			fseek($this->handle,4,SEEK_CUR);
			$this->infos['offset'] = $this->reading_val(4);
			fseek($this->handle,4,SEEK_CUR);
			$this->infos['largeur'] = $this->reading_val(4);
			$this->infos['longueur'] = $this->reading_val(4);
		} else return false;
	}
 
	private function is_bmp() {
		$this->handle = @fopen($this->filename,"rb+");
		if(!$this->handle) return false;
		$header = fread($this->handle,2);
		return $header == "\x42\x4d" ? true : false;
	}
 
	public function dump() {
		echo "Taille : ".$this->infos['taille']." octets.\n".
		"Offset : ".$this->infos['offset']."\n".
		"Largeur : ".$this->infos['largeur']." octets\n".
		"Longueur : ".$this->infos['longueur']." octets.\n";
	}
 
	private function reading_val($n,$mode = '') {
		$len = fread($this->handle,$n);
		$o   = '';
		for($i = strlen($len) - 1; $i >= 0; $i--) {
			if(ord($len[$i]) <= 0x0f) {
				$o .= '0'.dechex(ord($len[$i]));
			} else {
				$o .= dechex(ord($len[$i]));
			}
		}
		if(!$mode) {
			return hexdec($o);
		} else if($mode = "hex") {
			return $o;
		}
	}
 
	public function RemplissageAleatoire() {
		for($i = 0; $i <= $this->GetLongueur(); $i++) {
			for($j = 0; $j <= $this->GetLargeur(); $j++) {
				$color =  dechex(mt_rand(16,255)) . dechex(mt_rand(16,255)) . dechex(mt_rand(16,255));
				$this->SetPixel($j,$i,$color);
			}
		}
	}
 
 
	public function LirePixel($x,$y) {
		if($x <= $this->infos['largeur'] && $y <= $this->infos['longueur']) {
			rewind($this->handle);
			$offimg = ($this->infos['largeur'] * $y * 3) + ($x * 3) + ($y * ($this->infos['largeur'] % 4));
			fseek($this->handle, $this->infos['offset'] + $offimg);
			return $this->reading_val(3,"hex");
		}
	}
 
	public function SetPixel($x,$y,$color) {
		if($x <= $this->infos['largeur'] && $y <= $this->infos['longueur']) {
			rewind($this->handle);
			$offimg = ($this->infos['largeur'] * $y * 3) + ($x * 3) + ($y * ($this->infos['largeur'] % 4));
			fseek($this->handle, $this->infos['offset'] + $offimg);
			$rouge = chr(hexdec(substr($color,0,2)));
			$vert  = chr(hexdec(substr($color,2,2)));
			$bleu  = chr(hexdec(substr($color,4,2)));
			fwrite($this->handle,$bleu);
			fwrite($this->handle,$vert);
			fwrite($this->handle,$rouge);
 
		}
	}
 
	public function GetLongueur() {
		if(!empty($this->infos['longueur'])) return $this->infos['longueur'];
		else return 0;
	}
 
	public function GetLargeur() {
		if(!empty($this->infos['largeur'])) return $this->infos['largeur'];
		else return 0;
	}
 
	public function RemplissageTotal($color) {
		for($i = 0; $i <= $this->GetLongueur(); $i++) {
			for($j = 0; $j <= $this->GetLargeur(); $j++) {
				$this->SetPixel($j,$i,$color);
			}
		}
	}
 
	public function NoirEtBlanc($output) {
		copy($this->filename,$output);
		$img2 = new Bmp32BitsCarib0uClass($output);
		for($i = 0; $i <= $this->GetLongueur(); $i++) {
			for($j = 0; $j <= $this->GetLargeur(); $j++) {
				$color = $this->LirePixel($j,$i);
				$bleu  = hexdec(substr($color,0,2));
				$vert  = hexdec(substr($color,2,2));
				$rouge = hexdec(substr($color,4,2));
				$somme = $bleu + $vert + $rouge;
				$ncolor = ceil($somme / 3);
				if($ncolor <= 0x0f) {
					$ncolor = '0'.dechex($ncolor).'0'.dechex($ncolor).'0'.dechex($ncolor);
				} else {
					$ncolor = dechex($ncolor).dechex($ncolor).dechex($ncolor);
				}
				$img2->SetPixel($j,$i,$ncolor);
			}
		}
	}
	NoirEtBlanc($output);
	if(move_uploaded_file($img2, $dossier . $filename)) //Si la fonction renvoie TRUE, c'est que ça a fonctionné...
     {	echo 'Modifications effectué avec succès !';
		rename($dossier.$filename,$dossier.$newfichier);
	 }
	 else //Sinon (la fonction renvoie FALSE).
     {
          echo 'Echec de la modification !';
     }
}
?> | 
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