class.image.php

jquery+prototype+插件+源码+资料 非常的东西

<?php
	/**
	 * this class provide functions to edit an image, e.g. resize, rotate, flip, crop
	 * @author Logan Cai cailongqun [at] yahoo [dot] com [dot] cn
	 * @link  www.phpletter.com
	 * @version 0.9
	 * @since 14/May/2007
	 * @name Image
	 * 
	 */
	
	
	
	
	class Image
	{
		var $_debug = false; 
		var $_errors = array();
		var $gdInfo = array(); //keep all information of GD extension
		var $_imgOrig = null; //the hanlder of original image
		var $_imgFinal = null; //the handler of final image
		var $imageFile  = null;  
    var $transparentColorRed = null;
    var $transparentColorGreen = null;
    var $transparentColorBlue = null;		 
    var $chmod = 0755;
    var $_imgInfoOrig = array(
    	'name'=>'',
    	'ext'=>'',
    	'size'=>'',
    	'width'=>'',
    	'height'=>'',
    	'type'=>'',
    	'path'=>'',
    );    
    var $_imgInfoFinal = array(
    	'name'=>'',
    	'ext'=>'',
    	'size'=>'',
    	'width'=>'',
    	'height'=>'', 
    	'type'=>'',   
    	'path'=>'',
    );		
		var $_imgQuality = 90;
		/**
		 * constructor
		 *
		 * @param boolean $debug
		 * @return Image
		 */
		
		function __construct($debug = false)
		{
			$this->enableDebug($debug);
			$this->gdInfo = $this->getGDInfo();			
		}
		function Image($debug = false)
		{
			$this->__construct($debug);
		}
		/**
		 * enable to debug
		 *
		 * @param boolean $value
		 */
		function enableDebug($value)
		{
			$this->_debug = ($value?true:false);
		}
		/**
		 * check if debug enable
		 * @return boolean
		 */
		function _isDebugEnable()
		{
			return $this->_debug;
		}

	    /**
		 * append to errors array and shown the each error when the debug turned on  
		 * 
		 * @param  string $string
		 * @return void
     * @access private
     * @copyright this function originally come from Andy's php 
	 */
    function _debug($value)
    {
    		$this->_errors[] = $value;
        if ($this->_debug) 
        {
            echo $value . "<br />\n";
        }
    }		
    /**
     * show erros
     *
     */
    function showErrors()
    {
    	if(sizeof($this->_errors))
    	{
    		foreach($this->_errors as $error)
    		{
    			echo $error . "<br />\n";
    		}
    	}
    }
    /**
     * Load an image from the file system.
     * 
     * @param  string $filename
     * @return bool 
     * @access public
     * @copyright this function originally come from Andy's php 
     */
    function loadImage($filename)
    {
        $ext  = strtolower($this->_getExtension($filename));
        $func = 'imagecreatefrom' . ($ext == 'jpg' ? 'jpeg' : $ext);
        if (!$this->_isSupported($filename, $ext, $func, false)) {
            return false;
        }
        if($ext == "gif")
        {
             // the following part gets the transparency color for a gif file
            // this code is from the PHP manual and is written by
            // fred at webblake dot net and webmaster at webnetwizard dotco dotuk, thanks!
            $fp = @fopen($filename, "rb");
            $result = @fread($fp, 13);
            $colorFlag = ord(substr($result,10,1)) >> 7;
            $background = ord(substr($result,11));
            if ($colorFlag) {
                $tableSizeNeeded = ($background + 1) * 3;
                $result = @fread($fp, $tableSizeNeeded);
                $this->transparentColorRed = ord(substr($result, $background * 3, 1));
                $this->transparentColorGreen = ord(substr($result, $background * 3 + 1, 1));
                $this->transparentColorBlue = ord(substr($result, $background * 3 + 2, 1));
            }
            fclose($fp);
            // -- here ends the code related to transparency handling   	
        }
        $this->_imgOrig = @$func($filename);
        if ($this->_imgOrig == null) {
            $this->_debug("The image could not be created from the '$filename' file using the '$func' function.");
            return false;
        }else 
        {
        	$this->imageFile = $filename;
			    $this->_imgInfoOrig = array(
			    	'name'=>basename($filename),
			    	'ext'=>$ext,
			    	'size'=>filesize($filename),
			    	'path'=>$filename,
			    );        	
			    $imgInfo = $this->_getImageInfo($filename);
			    if(sizeof($imgInfo))
			    {
			    	foreach($imgInfo as $k=>$v)
			    	{
			    		$this->_imgInfoOrig[$k] = $v;
			    		$this->_imgInfoFinal[$k] = $v;
			    	}
			    }
			    
        }
        return true;
    }

    /**
     * Load an image from a string (eg. from a database table)
     * 
     * @param  string $string
     * @return bool 
     * @access public
     * @copyright this function originally come from Andy's php 
     */
    function loadImageFromString($string)
    {
    		$this->imageFile = $filename;
        $this->_imgOrig = imagecreatefromstring($string);
        if (!$this->_imgOrig) {
            $this->_debug('The image (supplied as a string) could not be created.');
            return false;
        }
        return true;
    }		
    

    /**
     * Save the modified image
     * 
     * @param  string $filename 
     * @param  int    $quality 
     * @param  string $forcetype 
     * @return bool 
     * @access public
     * @copyright this function originally come from Andy's php 
     */
    function saveImage($filename, $quality = 90, $forcetype = '')
    {
        if ($this->_imgFinal == null) {
            $this->_debug('No changes intend to be made.');
            return false;
        }

        $ext  = ($forcetype == '') ? $this->_getExtension($filename) : strtolower($forcetype);
        $func = 'image' . ($ext == 'jpg' ? 'jpeg' : $ext);
        if (!$this->_isSupported($filename, $ext, $func, true)) 
        {
            return false;
        }
        $saved = false;
        switch($ext) 
        {
            case 'gif':
                if ($this->gdInfo['Truecolor Support'] && imageistruecolor($this->_imgFinal)) 
                {
                    imagetruecolortopalette($this->_imgFinal, false, 255);
                }
            case 'png':
                $saved = $func($this->_imgFinal, $filename);
                break;
            case 'jpg':
                $saved = $func($this->_imgFinal, $filename, $quality);
                break;
        }

        if ($saved === false) 
        {
            $this->_debug("The image could not be saved to the '$filename' file as the file type '$ext' using the '$func' function.");
            return false;
        }else 
        {
        	$this->_imgInfoFinal['size'] = @filesize($filename);
        	@chmod($filename, intval($this->chmod, 8));
        }

        return true;
    }    
    /**
     * Shows the masked image without any saving
     * 
     * @param  string $type 
     * @param  int    $quality 
     * @return bool 
     * @access public
     * @copyright this function originally come from Andy's php 
     */
    function showImage($type = '', $quality = '')
    {
        if ($this->_imgFinal == null) {
            $this->_debug('There is no cropped image to show.');
            return false;
        }
        $type = (!empty($type)?$type:$this->_imgInfoOrig['ext']);
        $quality = (!empty($quality)?$quality:$this->_imgQuality);
				
        $type = strtolower($type);
        $func = 'image' . ($type == 'jpg' ? 'jpeg' : $type);
        $head = 'image/' . ($type == 'jpg' ? 'jpeg' : $type);
        
        if (!$this->_isSupported('[showing file]', $type, $func, false)) {
            return false;
        }

        header("Content-type: $head");
        switch($type) 
        {
            case 'gif':
                if ($this->gdInfo['Truecolor Support'] && imageistruecolor($this->_imgFinal)) 
                {
                    @imagetruecolortopalette($this->_imgFinal, false, 255);
                }
            case 'png':
                $func($this->_imgFinal);
                break;
            case 'jpg':
                $func($this->_imgFinal, '', $quality);
                break;
        }
        return true;
    }    
    
    /**
	 * Used for cropping image
	 * 
	 * @param  int $dst_x
	 * @param  int $dst_y
	 * @param  int $dst_w
	 * @param  int $dst_h
	 * @return bool
     * @access public
     * @copyright this function originally come from Andy's php 
	 */  
    function crop($dst_x, $dst_y, $dst_w, $dst_h)
    {
        if ($this->_imgOrig == null) {
            $this->_debug('The original image has not been loaded.');
            return false;
        }
        if (($dst_w <= 0) || ($dst_h <= 0)) {
            $this->_debug('The image could not be cropped because the size given is not valid.');
            return false;
        }
        if (($dst_w > imagesx($this->_imgOrig)) || ($dst_h > imagesy($this->_imgOrig))) {
            $this->_debug('The image could not be cropped because the size given is larger than the original image.');
            return false;
        }
        $this->_createFinalImageHandler($dst_w, $dst_h);
        if ($this->gdInfo['Truecolor Support']) 
        {
            	if(!@imagecopyresampled($this->_imgFinal, $this->_imgOrig, 0, 0, $dst_x, $dst_y, $dst_w, $dst_h, $dst_w, $dst_h))
            	{
            		$this->_debug('Unable crop the image.');
            		return false;
            	}            
        } else 
        {
          	if(!@imagecopyresized($this->_imgFinal, $this->_imgOrig, 0, 0, $dst_x, $dst_y, $dst_w, $dst_h, $dst_w, $dst_h))
          	{
           		$this->_debug('Unable crop the image.');
          		return false;           		
          	}
            
        }
        $this->_imgInfoFinal['width'] = $dst_w;
        $this->_imgInfoFinal['height'] = $dst_h;   
        return true; 	
    }
  
    
	/**
     * Resize the Image in the X and/or Y direction
     * If either is 0 it will be scaled proportionally
     *
     * @access public
     *
     * @param mixed $new_x 
     * @param mixed $new_y 
     * @param boolean $constraint keep to resize the image proportionally
     * @param boolean $unchangeIfsmaller keep the orignial size if the orignial smaller than the new size
     * 
     *
     * @return mixed none or PEAR_error
     */
	function resize( $new_x, $new_y, $constraint= false, $unchangeIfsmaller=false)
	{
		if(!$this->_imgOrig)
		{
			$this->_debug('No image fould.');
			return false;
		}		
		
		$new_x = intval($new_x);
		$new_y = intval($new_y);
		if($new_x <=0 || $new_y <= 0)
		{
			$this->_debug('either of new width or height can be zeor or less.');
		}else 
		{
		
			if($constraint)
			{
				if($new_x < 1 && $new_y < 1)
				{
					$new_x = $this->_imgInfoOrig['width'];
					$new_y = $this->_imgInfoOrig['height'];
				}elseif($new_x < 1)
				{
					$new_x = floor($new_y / $this->_imgInfoOrig['height'] * $this->_imgInfoOrig['width']);
	
				}elseif($new_y < 1)
				{
					$new_y = floor($new_x / $this->_imgInfoOrig['width'] * $this->_imgInfoOrig['height']);
				}else
				{
					$scale = min($new_x/$this->_imgInfoOrig['width'], $new_y/$this->_imgInfoOrig['height']) ;
					$new_x = floor($scale*$this->_imgInfoOrig['width']);
					$new_y = floor($scale*$this->_imgInfoOrig['height']);
				}						
			}
			if($unchangeIfsmaller)
			{
				if($this->_imgInfoOrig['width'] < $new_x && $this->_imgInfoOrig['height'] < $new_y )
				{
					$new_x = $this->_imgInfoOrig['width'];
					$new_y = $this->_imgInfoOrig['height'];
				}
			}
		
			
			
			if(is_null($this->_imgOrig))
			{
				$this->loadImage($filePath);
			}
			if(sizeof($this->_errors) == 0)
			{
				return $this->_resize($new_x, $new_y);
			}			
		}

		return false;
		
	} // End resize    
 	/**
     * resize the image and return the thumbnail image  details array("width"=>, "height"=>, "name")
     *
     * @param string $fileName 
     * @param int $new_x the thumbnail width
     * @param int $new_y the thumbnail height
     * @param string $mode can be save, view and both
     * @return unknown
     */
	function _resize( $new_x, $new_y) 
	{
		$this->_createFinalImageHandler($new_x, $new_y);
    // hacks fot transparency of png24 files
    if ($this->_imgInfoOrig['type'] == 'png') 
    {    
        @imagealphablending($this->_imgFinal, false);
				if(function_exists('ImageCopyResampled'))
				{