<?php

/**

 * 图像处理

 */

class image {

	var $w_pct = 100;

	var $w_quality = 80;

	var $w_minwidth = 300;

	var $w_minheight = 300;

	var $thumb_enable;

	var $watermark_enable;

	var $interlace = 0;

	var $siteinfo = array();



    function __construct($thumb_enable = 0 ,$siteid) {

    	$this->thumb_enable = $thumb_enable;

    	if($siteid) {

	    	$this->siteinfo = getcache('sitelist', 'commons');

	    	$this->site_setting = string2array($this->siteinfo[$siteid]['setting']);

			$this->watermark_enable = $this->site_setting['watermark_enable'];

			$this->set($this->site_setting['watermark_img'],$this->site_setting['watermark_pos'],$this->site_setting['watermark_minwidth'],$this->site_setting['watermark_minheight'],$this->site_setting['watermark_quality'],$this->site_setting['watermark_pct']);

    	}

    }



	function set($w_img, $w_pos, $w_minwidth = 300, $w_minheight = 300, $w_quality = 80, $w_pct = 100) {

		$this->w_img = $w_img;

		$this->w_pos = $w_pos;

		$this->w_minwidth = $w_minwidth;

		$this->w_minheight = $w_minheight;

		$this->w_quality = $w_quality;

		$this->w_pct = $w_pct;

	}



    function info($img) {

        $imageinfo = getimagesize($img);

        if($imageinfo === false) return false;

		$imagetype = strtolower(substr(image_type_to_extension($imageinfo[2]),1));

		$imagesize = filesize($img);

		$info = array(

				'width'=>$imageinfo[0],

				'height'=>$imageinfo[1],

				'type'=>$imagetype,

				'size'=>$imagesize,

				'mime'=>$imageinfo['mime']

				);

		return $info;

    }

    

    function getpercent($srcwidth,$srcheight,$dstw,$dsth) {

    	if (empty($srcwidth) || empty($srcheight) || ($srcwidth <= $dstW && $srcheight <= $dstH)) $w = $srcwidth ;$h = $srcheight;

    	if ((empty($dstw) || $dstw == 0)  && $dsth > 0 && $srcheight > $dsth) {

			$h = $dsth;

			$w = round($dsth / $srcheight * $srcwidth);

		} elseif ((empty($dsth) || $dsth == 0) && $dstw > 0 && $srcwidth > $dstw) {

			$w = $dstw;

			$h = round($dstw / $srcwidth * $srcheight);

		} elseif ($dstw > 0 && $dsth > 0) {

			if (($srcwidth / $dstw) < ($srcheight / $dsth)) {

					$w = round($dsth / $srcheight * $srcwidth);

					$h = $dsth;

			} elseif (($srcwidth / $dstw) > ($srcheight / $dsth)) {

					$w = $dstw;

					$h = round($dstw / $srcwidth * $srcheight );

			} else {

				$h = $dstw;

				$w = $dsth;

			}

		}

		$array['w']  = $w;

		$array['h']  = $h;

		return $array;

    }

    function thumb($image, $filename = '', $maxwidth = 200, $maxheight = 200, $suffix='', $autocut = 0, $ftp = 0) {

		if(!$this->thumb_enable || !$this->check($image)) return false;

        $info  = image::info($image);

        if($info === false) return false;

		$srcwidth  = $info['width'];

		$srcheight = $info['height'];

		$pathinfo = pathinfo($image);

		$type = $info['type'];

		if(!$type) $type =  $pathinfo['extension'];

		$type = strtolower($type);

		unset($info);



		$creat_arr = $this->getpercent($srcwidth,$srcheight,$maxwidth,$maxheight);

		$createwidth = $width = $creat_arr['w'];

		$createheight = $height = $creat_arr['h'];



		$psrc_x = $psrc_y = 0;

		if($autocut && $maxwidth > 0 && $maxheight > 0) {

			if($maxwidth/$maxheight<$srcwidth/$srcheight && $maxheight>=$height) {

				$width = $maxheight/$height*$width;

				$height = $maxheight;

			}elseif($maxwidth/$maxheight>$srcwidth/$srcheight && $maxwidth>=$width) {

				$height = $maxwidth/$width*$height;

				$width = $maxwidth;

			}

			$createwidth = $maxwidth;

			$createheight = $maxheight;

		}

		$createfun = 'imagecreatefrom'.($type=='jpg' ? 'jpeg' : $type);

		$srcimg = $createfun($image);

		if($type != 'gif' && function_exists('imagecreatetruecolor'))

			$thumbimg = imagecreatetruecolor($createwidth, $createheight); 

		else

			$thumbimg = imagecreate($width, $height); 



		if(function_exists('imagecopyresampled'))

			imagecopyresampled($thumbimg, $srcimg, 0, 0, $psrc_x, $psrc_y, $width, $height, $srcwidth, $srcheight); 

		else

			imagecopyresized($thumbimg, $srcimg, 0, 0, $psrc_x, $psrc_y, $width, $height,  $srcwidth, $srcheight); 

		if($type=='gif' || $type=='png') {

			$background_color  =  imagecolorallocate($thumbimg,  0, 255, 0);  //  指派一个绿色  

			imagecolortransparent($thumbimg, $background_color);  //  设置为透明色，若注释掉该行则输出绿色的图 

		}

		if($type=='jpg' || $type=='jpeg') imageinterlace($thumbimg, $this->interlace);

		$imagefun = 'image'.($type=='jpg' ? 'jpeg' : $type);

		if(empty($filename)) $filename  = substr($image, 0, strrpos($image, '.')).$suffix.'.'.$type;

		$imagefun($thumbimg, $filename);

		imagedestroy($thumbimg);

		imagedestroy($srcimg);

		if($ftp) {

			@unlink($image);

		}

		return $filename;

    }



	function watermark($source, $target = '', $w_pos = '', $w_img = '', $w_text = 'phpcms',$w_font = 8, $w_color = '#ff0000') {

		$w_pos = $w_pos ? $w_pos : $this->w_pos;

		$w_img = $w_img ? $w_img : $this->w_img;

		if(!$this->watermark_enable || !$this->check($source)) return false;

		if(!$target) $target = $source;

		$w_img = PHPCMS_PATH.$w_img;

		$source_info = getimagesize($source);

		$source_w    = $source_info[0];

		$source_h    = $source_info[1];		

		if($source_w < $this->w_minwidth || $source_h < $this->w_minheight) return false;

		switch($source_info[2]) {

			case 1 :

				$source_img = imagecreatefromgif($source);

				break;

			case 2 :

				$source_img = imagecreatefromjpeg($source);

				break;

			case 3 :

				$source_img = imagecreatefrompng($source);

				break;

			default :

				return false;

		}

		if(!empty($w_img) && file_exists($w_img)) {

			$ifwaterimage = 1;

			$water_info   = getimagesize($w_img);

			$width        = $water_info[0];

			$height       = $water_info[1];

			switch($water_info[2]) {

				case 1 :

					$water_img = imagecreatefromgif($w_img);

					break;

				case 2 :

					$water_img = imagecreatefromjpeg($w_img);

					break;

				case 3 :

					$water_img = imagecreatefrompng($w_img);

					break;

				default :

					return;

			}

		} else {		

			$ifwaterimage = 0;

			$temp = imagettfbbox(ceil($w_font*2.5), 0, PC_PATH.'libs/data/font/elephant.ttf', $w_text);

			$width = $temp[2] - $temp[6];

			$height = $temp[3] - $temp[7];

			unset($temp);

		}

		switch($w_pos) {

			case 1:

				$wx = 5;

				$wy = 5;

				break;

			case 2:

				$wx = ($source_w - $width) / 2;

				$wy = 0;

				break;

			case 3:

				$wx = $source_w - $width;

				$wy = 0;

				break;

			case 4:

				$wx = 0;

				$wy = ($source_h - $height) / 2;

				break;

			case 5:

				$wx = ($source_w - $width) / 2;

				$wy = ($source_h - $height) / 2;

				break;

			case 6:

				$wx = $source_w - $width;

				$wy = ($source_h - $height) / 2;

				break;

			case 7:

				$wx = 0;

				$wy = $source_h - $height;

				break;

			case 8:

				$wx = ($source_w - $width) / 2;

				$wy = $source_h - $height;

				break;

			case 9:

				$wx = $source_w - $width;

				$wy = $source_h - $height;

				break;

			case 10:

				$wx = rand(0,($source_w - $width));

				$wy = rand(0,($source_h - $height));

				break;				

			default:

				$wx = rand(0,($source_w - $width));

				$wy = rand(0,($source_h - $height));

				break;

		}

		if($ifwaterimage) {

			if($water_info[2] == 3) {

				imagecopy($source_img, $water_img, $wx, $wy, 0, 0, $width, $height);

			} else {

				imagecopymerge($source_img, $water_img, $wx, $wy, 0, 0, $width, $height, $this->w_pct);

			}

		} else {

			if(!empty($w_color) && (strlen($w_color)==7)) {

				$r = hexdec(substr($w_color,1,2));

				$g = hexdec(substr($w_color,3,2));

				$b = hexdec(substr($w_color,5));

			} else {

				return;

			}

			imagestring($source_img,$w_font,$wx,$wy,$w_text,imagecolorallocate($source_img,$r,$g,$b));

		}

		

		switch($source_info[2]) {

			case 1 :

				imagegif($source_img, $target);

				break;

			case 2 :

				imagejpeg($source_img, $target, $this->w_quality);

				break;

			case 3 :

				imagepng($source_img, $target);

				break;

			default :

				return;

		}



		if(isset($water_info)) {

			unset($water_info);

		}

		if(isset($water_img)) {

			imagedestroy($water_img);

		}

		unset($source_info);

		imagedestroy($source_img);

		return true;

	}



	function check($image) {

		return extension_loaded('gd') && preg_match("/\.(jpg|jpeg|gif|png)/i", $image, $m) && file_exists($image) && function_exists('imagecreatefrom'.($m[1] == 'jpg' ? 'jpeg' : $m[1]));

	}

	

}

?>