lainchan/inc/image.php

<?php

/*
 *  Copyright (c) 2010-2013 Tinyboard Development Group
 */

if (realpath($_SERVER['SCRIPT_FILENAME']) == str_replace('\\', '/', __FILE__)) {
	// You cannot request this file directly.
	exit;
}

class Image {
	public $src, $format, $image, $size;
	public function __construct($src, $format = false) {
		global $config;
		
		$this->src = $src;
		$this->format = $format;

		if ($config['thumb_method'] == 'imagick') {
			$classname = 'ImageImagick';
		} elseif ($config['thumb_method'] == 'convert' || $config['thumb_method'] == 'convert+gifsicle') {
			$classname = 'ImageConvert';
		} 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;
		
		$gifsicle = false;

		if ($config['thumb_method'] == 'imagick') {
			$classname = 'ImageImagick';
		} elseif ($config['thumb_method'] == 'convert') {
			$classname = 'ImageConvert';
		} elseif ($config['thumb_method'] == 'convert+gifsicle') {
			$classname = 'ImageConvert';
			$gifsicle = true;
		} else {
			$classname = 'Image' . strtoupper($extension);
			if (!class_exists($classname)) {
				error('Unsupported file format: ' . $extension);
			}
		}
		
		$thumb = new $classname(false);
		$thumb->src = $this->src;
		$thumb->format = $this->format;
		$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;
		}
		
		if ($gifsicle) {
			$thumb->gifsicle = 1;
		}
		$thumb->_resize($this->image->image, $width, $height);
		
		return $thumb;
	}
	
	public function to($dst) {
		$this->image->to($dst);
	}
	
	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) {
		if ($config['strip_exif']) {
			$this->image->stripImage();
		}
		if (preg_match('/\.gif$/i', $src))
			$this->image->writeImages($src, true);
		else
			$this->image->writeImage($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() {
		global $config;
		
		if ($this->format == 'gif' && ($config['thumb_ext'] == 'gif' || $config['thumb_ext'] == '')) {
			$this->image = new Imagick();
			$this->image->setFormat('gif');
			
			$keep_frames = array();
			for ($i = 0; $i < $this->original->getNumberImages(); $i += floor($this->original->getNumberImages() / $config['thumb_keep_animation_frames']))
				$keep_frames[] = $i;
			
			$i = 0;
			$delay = 0;
			foreach ($this->original as $frame) {
				$delay += $frame->getImageDelay();
				
				if (in_array($i, $keep_frames)) {
					// $frame->scaleImage($this->width, $this->height, false);
					$frame->sampleImage($this->width, $this->height);
					$frame->setImagePage($this->width, $this->height, 0, 0);
					$frame->setImageDelay($delay);
					$delay = 0;
					
					$this->image->addImage($frame->getImage());
				}
				$i++;
			}		
		} else {
			$this->image = clone $this->original;
			$this->image->scaleImage($this->width, $this->height, false);
		}
	}
}


class ImageConvert extends ImageBase {
	public $width, $height, $temp, $gifsicle;
	
	public function init() {
		global $config;
		
		$this->temp = false;
	}
	public function from() {	
		$size = trim(shell_exec('identify -format "%w %h" ' . escapeshellarg($this->src . '[0]')));	
		if (preg_match('/^(\d+) (\d+)$/', $size, $m)) {
			$this->width = $m[1];
			$this->height = $m[2];
			
			$this->image = true;
		} else {
			// mark as invalid
			$this->image = false;
		}
	}
	public function to($src) {
		global $config;
		
		if (!$this->temp) {
			if ($config['strip_exif']) {
				shell_exec('convert ' . escapeshellarg($this->src) . ' -strip ' . escapeshellarg($src));
			} else {
				shell_exec('convert ' . escapeshellarg($this->src) . ' ' . escapeshellarg($src));
			}
		} else {
			rename($this->temp, $src);
			chmod($src, 0664);
		}
	}
	public function width() {
		return $this->width;
	}
	public function height() {
		return $this->height;
	}
	public function destroy() {
		@unlink($this->temp);
		$this->temp = false;
	}
	public function resize() {
		global $config;
		
		if ($this->temp) {
			// remove old
			$this->destroy();
		}
		
		$this->temp = tempnam($config['tmp'], 'imagick');
		
		$quality = $config['thumb_quality'] * 10;
		
		if ($this->format == 'gif' && ($config['thumb_ext'] == 'gif' || $config['thumb_ext'] == '') && $config['thumb_keep_animation_frames'] > 1) {
			if ($this->gifsicle) {
				if (shell_exec("gifsicle --unoptimize -O2 --resize {$this->width}x{$this->height} < " .
					escapeshellarg($this->src . '') . " > " . escapeshellarg($this->temp)) || !file_exists($this->temp))
					error('Failed to resize image!');
			}
			else {
				if (shell_exec("convert -background transparent -filter Point -sample {$this->width}x{$this->height} +antialias -quality {$quality} " .
					escapeshellarg($this->src . '') . " " . escapeshellarg($this->temp)) || !file_exists($this->temp))
					error('Failed to resize image!');
			}
		} else {
			if (shell_exec("convert -background transparent -flatten -filter Point -scale {$this->width}x{$this->height} +antialias -quality {$quality} " .
				escapeshellarg($this->src . '[0]') . " " . escapeshellarg($this->temp)) || !file_exists($this->temp))
				error('Failed to resize image!');
		}
	}
}

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);
}