vichan/inc/image.php

<?php
	if($_SERVER['SCRIPT_FILENAME'] == str_replace('\\', '/', __FILE__)) {
		// You cannot request this file directly.
		header('Location: ../', true, 302);
		exit;
	}

	class Image {
		public $src, $format, $image, $size;
		public function __construct($src, $format = false) {
			global $config;
			
			$this->src = $src;
			$this->format = $format;
			
			if($config['imagick']) {
				$classname = 'ImageImagick';
			} else {
				$classname = 'Image' . strtoupper($this->format);
				if(!class_exists($classname)) {
					error('Unsupported file format: ' . $this->format);
				}
			}
			
			$this->image = new $classname($this);
			if(!$this->image->valid()) {
				$this->delete();
				error($config['error']['invalidimg']);
			}
			
			$this->size = (object)Array('width' => $this->image->_width(), 'height' => $this->image->_height());
			if($this->size->width < 1 || $this->size->height < 1) {
				$this->delete();
				error($config['error']['invalidimg']);
			}
		}
		
		public function resize($extension, $max_width, $max_height) {
			global $config;
			
			if($config['imagick']) {
				$classname = 'ImageImagick';
			} else {
				$classname = 'Image' . strtoupper($extension);
				if(!class_exists($classname)) {
					error('Unsupported file format: ' . $extension);
				}
			}
			
			$thumb = new $classname(false);
			$thumb->original_width = $this->size->width;
			$thumb->original_height = $this->size->height;
			
			$x_ratio = $max_width / $this->size->width;
			$y_ratio = $max_height / $this->size->height;
			
			if(($this->size->width <= $max_width) && ($this->size->height <= $max_height)) {
				$width = $this->size->width;
				$height = $this->size->height;
			} elseif (($x_ratio * $this->size->height) < $max_height) {
				$height = ceil($x_ratio * $this->size->height);
				$width = $max_width;
			} else {
				$width = ceil($y_ratio * $this->size->width);
				$height = $max_height;
			}
			
			$thumb->_resize($this->image->image, $width, $height);
			return $thumb;
		}
		
		public function delete() {
			file_unlink($this->src);
		}
		public function destroy() {
			$this->image->_destroy();
		}
	}
	
	class ImageGD {
		public function GD_create() {
			$this->image = imagecreatetruecolor($this->width, $this->height);
		}
		public function GD_copyresampled() {
			imagecopyresampled($this->image, $this->original, 0, 0, 0, 0, $this->width, $this->height, $this->original_width, $this->original_height);
		}
		public function GD_resize() {
			$this->GD_create();
			$this->GD_copyresampled();
		}
	}
	
	class ImageBase extends ImageGD {
		public $image, $src, $original, $original_width, $original_height, $width, $height;		
		public function valid() {
			return (bool)$this->image;
		}
		
		public function __construct($img) {
			if(method_exists($this, 'init'))
				$this->init();
			
			if($img !== false) {
				$this->src = &$img->src;
				$this->from();
			}
		}
		
		public function _width() {
			if(method_exists($this, 'width'))
				return $this->width();
			// use default GD functions
			return imagesx($this->image);
		}
		public function _height() {
			if(method_exists($this, 'height'))
				return $this->height();
			// use default GD functions
			return imagesy($this->image);
		}
		public function _destroy() {
			if(method_exists($this, 'destroy'))
				return $this->destroy();
			// use default GD functions
			return imagedestroy($this->image);
		}
		public function _resize($original, $width, $height) {
			$this->original = &$original;
			$this->width = $width;
			$this->height = $height;
			
			if(method_exists($this, 'resize'))
				$this->resize();
			else
				// use default GD functions
				$this->GD_resize();
		}
	}
	
	class ImageImagick extends ImageBase {
		public function init() {
			$this->image = new Imagick();
			$this->image->setBackgroundColor(new ImagickPixel('transparent'));
		}
		public function from() {
			try {
				$this->image->readImage($this->src);
			} catch(ImagickException $e) {
				// invalid image
				$this->image = false;
			}
		}
		public function to($src) {
			$this->image->writeImage($src);
		}
		public function width() {
			return $this->image->getImageWidth();
		}
		public function height() {
			return $this->image->getImageHeight();
		}
		public function destroy() {
			return $this->image->destroy();
		}
		public function resize() {
			$this->image = clone $this->original;
			
			$this->image->scaleImage($this->width, $this->height, false);
		}
	}
	
	
	class ImagePNG extends ImageBase {
		public function from() {
			$this->image = @imagecreatefrompng($this->src);
		}
		public function to($src) {
			global $config;
			imagepng($this->image, $src, $config['thumb_quality']);
		}
		public function resize() {
			$this->GD_create();
			imagecolortransparent($this->image, imagecolorallocatealpha($this->image, 0, 0, 0, 0));
			imagesavealpha($this->image, true);
			imagealphablending($this->image, false);
			$this->GD_copyresampled();
		}
	}
	
	class ImageGIF extends ImageBase {
		public function from() {
			$this->image = @imagecreatefromgif($this->src);
		}
		public function to($src) {
			imagegif($this->image, $src);
		}
		public function resize() {
			$this->GD_create();
			imagecolortransparent($this->image, imagecolorallocatealpha($this->image, 0, 0, 0, 0));
			imagesavealpha($this->image, true);
			$this->GD_copyresampled();
		}
	}
	
	class ImageJPG extends ImageBase {
		public function from() {
			$this->image = @imagecreatefromjpeg($this->src);
		}
		public function to($src) {
			imagejpeg($this->image, $src);
		}
	}
	class ImageJPEG extends ImageJPG {
	}
	
	class ImageBMP extends ImageBase {
		public function from() {
			$this->image = @imagecreatefrombmp($this->src);
		}
		public function to($src) {
			imagebmp($this->image, $src);
		}
	}
	
	
	/*********************************************/
	/* Fonction: imagecreatefrombmp              */
	/* Author:   DHKold                          */
	/* Contact:  admin@dhkold.com                */
	/* Date:     The 15th of June 2005           */
	/* Version:  2.0B                            */
	/*********************************************/

	function imagecreatefrombmp($filename) {
	   if (! $f1 = fopen($filename,"rb")) return FALSE;
	   $FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1,14));
	   if ($FILE['file_type'] != 19778) return FALSE;
	   $BMP = unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
					 '/Vcompression/Vsize_bitmap/Vhoriz_resolution'.
					 '/Vvert_resolution/Vcolors_used/Vcolors_important', fread($f1,40));
	   $BMP['colors'] = pow(2,$BMP['bits_per_pixel']);
	   if ($BMP['size_bitmap'] == 0) $BMP['size_bitmap'] = $FILE['file_size'] - $FILE['bitmap_offset'];
	   $BMP['bytes_per_pixel'] = $BMP['bits_per_pixel']/8;
	   $BMP['bytes_per_pixel2'] = ceil($BMP['bytes_per_pixel']);
	   $BMP['decal'] = ($BMP['width']*$BMP['bytes_per_pixel']/4);
	   $BMP['decal'] -= floor($BMP['width']*$BMP['bytes_per_pixel']/4);
	   $BMP['decal'] = 4-(4*$BMP['decal']);
	   if ($BMP['decal'] == 4) $BMP['decal'] = 0;

	   $PALETTE = array();
	   if ($BMP['colors'] < 16777216)
	   {
		$PALETTE = unpack('V'.$BMP['colors'], fread($f1,$BMP['colors']*4));
	   }

	   $IMG = fread($f1,$BMP['size_bitmap']);
	   $VIDE = chr(0);

	   $res = imagecreatetruecolor($BMP['width'],$BMP['height']);
	   $P = 0;
	   $Y = $BMP['height']-1;
	   while ($Y >= 0)
	   {
		$X=0;
		while ($X < $BMP['width'])
		{
		 if ($BMP['bits_per_pixel'] == 24)
			$COLOR = unpack("V",substr($IMG,$P,3).$VIDE);
		 elseif ($BMP['bits_per_pixel'] == 16)
		 {  
			$COLOR = unpack("n",substr($IMG,$P,2));
			$COLOR[1] = $PALETTE[$COLOR[1]+1];
		 }
		 elseif ($BMP['bits_per_pixel'] == 8)
		 {  
			$COLOR = unpack("n",$VIDE.substr($IMG,$P,1));
			$COLOR[1] = $PALETTE[$COLOR[1]+1];
		 }
		 elseif ($BMP['bits_per_pixel'] == 4)
		 {
			$COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
			if (($P*2)%2 == 0) $COLOR[1] = ($COLOR[1] >> 4) ; else $COLOR[1] = ($COLOR[1] & 0x0F);
			$COLOR[1] = $PALETTE[$COLOR[1]+1];
		 }
		 elseif ($BMP['bits_per_pixel'] == 1)
		 {
			$COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
			if     (($P*8)%8 == 0) $COLOR[1] =  $COLOR[1]        >>7;
			elseif (($P*8)%8 == 1) $COLOR[1] = ($COLOR[1] & 0x40)>>6;
			elseif (($P*8)%8 == 2) $COLOR[1] = ($COLOR[1] & 0x20)>>5;
			elseif (($P*8)%8 == 3) $COLOR[1] = ($COLOR[1] & 0x10)>>4;
			elseif (($P*8)%8 == 4) $COLOR[1] = ($COLOR[1] & 0x8)>>3;
			elseif (($P*8)%8 == 5) $COLOR[1] = ($COLOR[1] & 0x4)>>2;
			elseif (($P*8)%8 == 6) $COLOR[1] = ($COLOR[1] & 0x2)>>1;
			elseif (($P*8)%8 == 7) $COLOR[1] = ($COLOR[1] & 0x1);
			$COLOR[1] = $PALETTE[$COLOR[1]+1];
		 }
		 else
			return FALSE;
		 imagesetpixel($res,$X,$Y,$COLOR[1]);
		 $X++;
		 $P += $BMP['bytes_per_pixel'];
		}
		$Y--;
		$P+=$BMP['decal'];
	   }
	   fclose($f1);

	 return $res;
	}
	
	function imagebmp(&$img, $filename='') {
		$widthOrig = imagesx($img);
		$widthFloor = ((floor($widthOrig/16))*16);
		$widthCeil = ((ceil($widthOrig/16))*16);
		$height = imagesy($img);

		$size = ($widthCeil*$height*3)+54;

		// Bitmap File Header
		$result = 'BM';	 // header (2b)
		$result .= int_to_dword($size); // size of file (4b)
		$result .= int_to_dword(0); // reserved (4b)
		$result .= int_to_dword(54); // byte location in the file which is first byte of IMAGE (4b)
		// Bitmap Info Header
		$result .= int_to_dword(40); // Size of BITMAPINFOHEADER (4b)
		$result .= int_to_dword($widthCeil); // width of bitmap (4b)
		$result .= int_to_dword($height); // height of bitmap (4b)
		$result .= int_to_word(1);	// biPlanes = 1 (2b)
		$result .= int_to_word(24); // biBitCount = {1 (mono) or 4 (16 clr ) or 8 (256 clr) or 24 (16 Mil)} (2b
		$result .= int_to_dword(0); // RLE COMPRESSION (4b)
		$result .= int_to_dword(0); // width x height (4b)
		$result .= int_to_dword(0); // biXPelsPerMeter (4b)
		$result .= int_to_dword(0); // biYPelsPerMeter (4b)
		$result .= int_to_dword(0); // Number of palettes used (4b)
		$result .= int_to_dword(0); // Number of important colour (4b)

		// is faster than chr()
		$arrChr = array();
		for($i=0; $i<256; $i++){
		$arrChr[$i] = chr($i);
		}

		// creates image data
		$bgfillcolor = array('red'=>0, 'green'=>0, 'blue'=>0);

		// bottom to top - left to right - attention blue green red !!!
		$y=$height-1;
		for ($y2=0; $y2<$height; $y2++) {
			for ($x=0; $x<$widthFloor;	) {
				$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
				$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
				$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
				$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
				$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
				$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
				$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
				$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
			}
			for ($x=$widthFloor; $x<$widthCeil; $x++) {
				$rgb = ($x<$widthOrig) ? imagecolorsforindex($img, imagecolorat($img, $x, $y)) : $bgfillcolor;
				$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
			}
			$y--;
		}

		// see imagegif
		if($filename == '') {
			echo $result;
		} else {
			$file = fopen($filename, 'wb');
			fwrite($file, $result);
			fclose($file);
		}
	}
	// imagebmp helpers
	function int_to_dword($n) {
		return chr($n & 255).chr(($n >> 8) & 255).chr(($n >> 16) & 255).chr(($n >> 24) & 255);
	}
	function int_to_word($n) {
		return chr($n & 255).chr(($n >> 8) & 255);
	}

?>