很强的PHP图片处理类

/**
* 基本图片处理，用于完成图片缩入，水印添加
* 当水印图超过目标图片尺寸时，水印图能自动适应目标图片而缩小
* 水印图可以设置跟背景的合并度
*
* Copyright(c) 2005 by ustb99. All rights reserved
*
* To contact the author write to {@link mailto:ustb80@163.com}
*
* @author 偶然
* @version $Id: thumb.class.php,v 1.9 2006/09/30 09:31:56 zengjian Exp $
* @package system

 < ?php
 /**
  *  基本图片处理，用于完成图片缩入，水印添加
  *  当水印图超过目标图片尺寸时，水印图能自动适应目标图片而缩小
  *  水印图可以设置跟背景的合并度
  *
  *  Copyright(c) 2005 by ustb99. All rights reserved
  *
  *  To contact the author write to {@link mailto:ustb80@163.com}
  *
  * @author 偶然
  * @version $Id: thumb.class.php,v 1.9 2006/09/30 09:31:56 zengjian Exp $
  * @package system
  */

 /**
  * ThumbHandler
  * @access public
  */

 /*
  使用方法:
     自动裁切:
     程序会按照图片的尺寸从中部裁切最大的正方形，并按目标尺寸进行缩略

     $t->setSrcImg("img/test.jpg");
     $t->setCutType(1);//这一句就OK了
     $t->setDstImg("tmp/new_test.jpg");
     $t->createImg(60,60);

     手工裁切:
     程序会按照指定的位置从源图上取图

     $t->setSrcImg("img/test.jpg");
     $t->setCutType(2);//指明为手工裁切
     $t->setSrcCutPosition(100, 100);// 源图起点坐标
     $t->setRectangleCut(300, 200);// 裁切尺寸
     $t->setDstImg("tmp/new_test.jpg");
     $t->createImg(300,200);
 */
 class ThumbHandler
 {
     var $dst_img;// 目标文件
     var $h_src; // 图片资源句柄
     var $h_dst;// 新图句柄
     var $h_mask;// 水印句柄
     var $img_create_quality = 100;// 图片生成质量
     var $img_display_quality = 80;// 图片显示质量,默认为75
     var $img_scale = 0;// 图片缩放比例
     var $src_w = 0;// 原图宽度
     var $src_h = 0;// 原图高度
     var $dst_w = 0;// 新图总宽度
     var $dst_h = 0;// 新图总高度
     var $fill_w;// 填充图形宽
     var $fill_h;// 填充图形高
     var $copy_w;// 拷贝图形宽
     var $copy_h;// 拷贝图形高
     var $src_x = 0;// 原图绘制起始横坐标
     var $src_y = 0;// 原图绘制起始纵坐标
     var $start_x;// 新图绘制起始横坐标
     var $start_y;// 新图绘制起始纵坐标
     var $mask_word;// 水印文字
     var $mask_img;// 水印图片
     var $mask_pos_x = 0;// 水印横坐标
     var $mask_pos_y = 0;// 水印纵坐标
     var $mask_offset_x = 5;// 水印横向偏移
     var $mask_offset_y = 5;// 水印纵向偏移
     var $font_w;// 水印字体宽
     var $font_h;// 水印字体高
     var $mask_w;// 水印宽
     var $mask_h;// 水印高
     var $mask_font_color = "#ffffff";// 水印文字颜色
     var $mask_font = 2;// 水印字体
     var $font_size;// 尺寸
     var $mask_position = 0;// 水印位置
     var $mask_img_pct = 50;// 图片合并程度,值越大，合并程序越低
     var $mask_txt_pct = 50;// 文字合并程度,值越小，合并程序越低
     var $img_border_size = 0;// 图片边框尺寸
     var $img_border_color;// 图片边框颜色
     var $_flip_x=0;// 水平翻转次数
     var $_flip_y=0;// 垂直翻转次数

     var $cut_type=0;// 剪切类型

     var $img_type;// 文件类型

     // 文件类型定义,并指出了输出图片的函数
     var $all_type = array(
         "jpg"  => array("output"=>"imagejpeg"),
         "gif"  => array("output"=>"imagegif"),
         "png"  => array("output"=>"imagepng"),
         "wbmp" => array("output"=>"image2wbmp"),
         "jpeg" => array("output"=>"imagejpeg"));

     /**
      * 构造函数
      */
     function ThumbHandler()
     {
         $this->mask_font_color = "#ffffff";
         $this->font = 2;
         $this->font_size = 12;
     }

     /**
      * 取得图片的宽
      */
     function getImgWidth($src)
     {
         return imagesx($src);
     }

     /**
      * 取得图片的高
      */
     function getImgHeight($src)
     {
         return imagesy($src);
     }

     /**
      * 设置图片生成路径
      *
      * @param    string    $src_img   图片生成路径
      */
     function setSrcImg($src_img, $img_type=null)
     {
         if(!file_exists($src_img))
         {
             die("图片不存在");
         }

         if(!empty($img_type))
         {
             $this->img_type = $img_type;
         }
         else
         {
             $this->img_type = $this->_getImgType($src_img);
         }

         $this->_checkValid($this->img_type);

         // file_get_contents函数要求php版本>4.3.0
         $src = '';
         if(function_exists("file_get_contents"))
         {
             $src = file_get_contents($src_img);
         }
         else
         {
             $handle = fopen ($src_img, "r");
             while (!feof ($handle))
             {
                 $src .= fgets($fd, 4096);
             }
             fclose ($handle);
         }
         if(empty($src))
         {
             die("图片源为空");
         }
         $this->h_src = @ImageCreateFromString($src);
         $this->src_w = $this->getImgWidth($this->h_src);
         $this->src_h = $this->getImgHeight($this->h_src);
     }

     /**
      * 设置图片生成路径
      *
      * @param    string    $dst_img   图片生成路径
      */
     function setDstImg($dst_img)
     {
         $arr  = explode('/',$dst_img);
         $last = array_pop($arr);
         $path = implode('/',$arr);
         $this->_mkdirs($path);
         $this->dst_img = $dst_img;
     }

     /**
      * 设置图片的显示质量
      *
      * @param    string      $n    质量
      */
     function setImgDisplayQuality($n)
     {
         $this->img_display_quality = (int)$n;
     }

     /**
      * 设置图片的生成质量
      *
      * @param    string      $n    质量
      */
     function setImgCreateQuality($n)
     {
         $this->img_create_quality = (int)$n;
     }

     /**
      * 设置文字水印
      *
      * @param    string     $word    水印文字
      * @param    integer    $font    水印字体
      * @param    string     $color   水印字体颜色
      */
     function setMaskWord($word)
     {
         $this->mask_word .= $word;
     }

     /**
      * 设置字体颜色
      *
      * @param    string     $color    字体颜色
      */
     function setMaskFontColor($color="#ffffff")
     {
         $this->mask_font_color = $color;
     }

     /**
      * 设置水印字体
      *
      * @param    string|integer    $font    字体
      */
     function setMaskFont($font=2)
     {
         if(!is_numeric($font) && !file_exists($font))
         {
             die("字体文件不存在");
         }
         $this->font = $font;
     }

     /**
      * 设置文字字体大小,仅对truetype字体有效
      */
     function setMaskFontSize($size = "12")
     {
         $this->font_size = $size;
     }

     /**
      * 设置图片水印
      *
      * @param    string    $img     水印图片源
      */
     function setMaskImg($img)
     {
         $this->mask_img = $img;
     }

     /**
      * 设置水印横向偏移
      *
      * @param    integer     $x    横向偏移量
      */
     function setMaskOffsetX($x)
     {
         $this->mask_offset_x = (int)$x;
     }

     /**
      * 设置水印纵向偏移
      *
      * @param    integer     $y    纵向偏移量
      */
     function setMaskOffsetY($y)
     {
         $this->mask_offset_y = (int)$y;
     }

     /**
      * 指定水印位置
      *
      * @param    integer     $position    位置,1:左上,2:左下,3:右上,0/4:右下
      */
     function setMaskPosition($position=0)
     {
         $this->mask_position = (int)$position;
     }

     /**
      * 设置图片合并程度
      *
      * @param    integer     $n    合并程度
      */
     function setMaskImgPct($n)
     {
         $this->mask_img_pct = (int)$n;
     }

     /**
      * 设置文字合并程度
      *
      * @param    integer     $n    合并程度
      */
     function setMaskTxtPct($n)
     {
         $this->mask_txt_pct = (int)$n;
     }

     /**
      * 设置缩略图边框
      *
      * @param    (类型)     (参数名)    (描述)
      */
     function setDstImgBorder($size=1, $color="#000000")
     {
         $this->img_border_size  = (int)$size;
         $this->img_border_color = $color;
     }

     /**
      * 水平翻转
      */
     function flipH()
     {
         $this->_flip_x++;
     }

     /**
      * 垂直翻转
      */
     function flipV()
     {
         $this->_flip_y++;
     }

     /**
      * 设置剪切类型
      *
      * @param    (类型)     (参数名)    (描述)
      */
     function setCutType($type)
     {
         $this->cut_type = (int)$type;
     }

     /**
      * 设置图片剪切
      *
      * @param    integer     $width    矩形剪切
      */
     function setRectangleCut($width, $height)
     {
         $this->fill_w = (int)$width;
         $this->fill_h = (int)$height;
     }

     /**
      * 设置源图剪切起始坐标点
      *
      * @param    (类型)     (参数名)    (描述)
      */
     function setSrcCutPosition($x, $y)
     {
         $this->src_x  = (int)$x;
         $this->src_y  = (int)$y;
     }

     /**
      * 创建图片,主函数
      * @param    integer    $a     当缺少第二个参数时，此参数将用作百分比，
      *                             否则作为宽度值
      * @param    integer    $b     图片缩放后的高度
      */
     function createImg($a, $b=null)
     {
         $num = func_num_args();
         if(1 == $num)
         {
             $r = (int)$a;
             if($r < 1)
             {
                 die("图片缩放比例不得小于1");
             }
             $this->img_scale = $r;
             $this->_setNewImgSize($r);
         }

         if(2 == $num)
         {
             $w = (int)$a;
             $h = (int)$b;
             if(0 == $w)
             {
                 die("目标宽度不能为0");
             }
             if(0 == $h)
             {
                 die("目标高度不能为0");
             }
             $this->_setNewImgSize($w, $h);
         }

         if($this->_flip_x%2!=0)
         {
             $this->_flipH($this->h_src);
         }

         if($this->_flip_y%2!=0)
         {
             $this->_flipV($this->h_src);
         }
         $this->_createMask();
         $this->_output();

         // 释放
         if(imagedestroy($this->h_src) && imagedestroy($this->h_dst))
         {
             Return true;
         }
         else
         {
             Return false;
         }
     }

     /**
      * 生成水印,调用了生成水印文字和水印图片两个方法
      */
     function _createMask()
     {
         if($this->mask_word)
         {
             // 获取字体信息
             $this->_setFontInfo();

             if($this->_isFull())
             {
                 die("水印文字过大");
             }
             else
             {
                 $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);
                 $white = ImageColorAllocate($this->h_dst,255,255,255);
                 imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$white);// 填充背景色
                 $this->_drawBorder();
                 imagecopyresampled( $this->h_dst, $this->h_src,
                                     $this->start_x, $this->start_y,
                                     $this->src_x, $this->src_y,
                                     $this->fill_w, $this->fill_h,
                                     $this->copy_w, $this->copy_h);
                 $this->_createMaskWord($this->h_dst);
             }
         }

         if($this->mask_img)
         {
             $this->_loadMaskImg();//加载时，取得宽高

             if($this->_isFull())
             {
                 // 将水印生成在原图上再拷
                 $this->_createMaskImg($this->h_src);
                 $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);
                 $white = ImageColorAllocate($this->h_dst,255,255,255);
                 imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$white);// 填充背景色
                 $this->_drawBorder();
                 imagecopyresampled( $this->h_dst, $this->h_src,
                                     $this->start_x, $this->start_y,
                                     $this->src_x, $this->src_y,
                                     $this->fill_w, $this->start_y,
                                     $this->copy_w, $this->copy_h);
             }
             else
             {
                 // 创建新图并拷贝
                 $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);
                 $white = ImageColorAllocate($this->h_dst,255,255,255);
                 imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$white);// 填充背景色
                 $this->_drawBorder();
                 imagecopyresampled( $this->h_dst, $this->h_src,
                                     $this->start_x, $this->start_y,
                                     $this->src_x, $this->src_y,
                                     $this->fill_w, $this->fill_h,
                                     $this->copy_w, $this->copy_h);
                 $this->_createMaskImg($this->h_dst);
             }
         }

         if(empty($this->mask_word) && empty($this->mask_img))
         {
             $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);
             $white = ImageColorAllocate($this->h_dst,255,255,255);
             imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$white);// 填充背景色
             $this->_drawBorder();

             imagecopyresampled( $this->h_dst, $this->h_src,
                         $this->start_x, $this->start_y,
                         $this->src_x, $this->src_y,
                         $this->fill_w, $this->fill_h,
                         $this->copy_w, $this->copy_h);
         }
     }

     /**
      * 画边框
      */
     function _drawBorder()
     {
         if(!empty($this->img_border_size))
         {
             $c = $this->_parseColor($this->img_border_color);
             $color = ImageColorAllocate($this->h_src,$c[0], $c[1], $c[2]);
             imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$color);// 填充背景色
         }
     }

     /**
      * 生成水印文字
      */
     function _createMaskWord($src)
     {
         $this->_countMaskPos();
         $this->_checkMaskValid();

         $c = $this->_parseColor($this->mask_font_color);
         $color = imagecolorallocatealpha($src, $c[0], $c[1], $c[2], $this->mask_txt_pct);

         if(is_numeric($this->font))
         {
             imagestring($src,
                         $this->font,
                         $this->mask_pos_x, $this->mask_pos_y,
                         $this->mask_word,
                         $color);
         }
         else
         {
             imagettftext($src,
                         $this->font_size, 0,
                         $this->mask_pos_x, $this->mask_pos_y,
                         $color,
                         $this->font,
                         $this->mask_word);
         }
     }

     /**
      * 生成水印图
      */
     function _createMaskImg($src)
     {
         $this->_countMaskPos();
         $this->_checkMaskValid();
         imagecopymerge($src,
                         $this->h_mask,
                         $this->mask_pos_x ,$this->mask_pos_y,
                         0, 0,
                         $this->mask_w, $this->mask_h,
                         $this->mask_img_pct);

         imagedestroy($this->h_mask);
     }

     /**
      * 加载水印图
      */
     function _loadMaskImg()
     {
         $mask_type = $this->_getImgType($this->mask_img);
         $this->_checkValid($mask_type);

         // file_get_contents函数要求php版本>4.3.0
         $src = '';
         if(function_exists("file_get_contents"))
         {
             $src = file_get_contents($this->mask_img);
         }
         else
         {
             $handle = fopen ($this->mask_img, "r");
             while (!feof ($handle))
             {
                 $src .= fgets($fd, 4096);
             }
             fclose ($handle);
         }
         if(empty($this->mask_img))
         {
             die("水印图片为空");
         }
         $this->h_mask = ImageCreateFromString($src);
         $this->mask_w = $this->getImgWidth($this->h_mask);
         $this->mask_h = $this->getImgHeight($this->h_mask);
     }

     /**
      * 图片输出
      */
     function _output()
     {
         $img_type  = $this->img_type;
         $func_name = $this->all_type[$img_type]['output'];
         if(function_exists($func_name))
         {
             // 判断浏览器,若是IE就不发送头
             if(isset($_SERVER['HTTP_USER_AGENT']))
             {
                 $ua = strtoupper($_SERVER['HTTP_USER_AGENT']);
                 if(!preg_match('/^.*MSIE.*\)$/i',$ua))
                 {
                     header("Content-type:$img_type");
                 }
             }
             $func_name($this->h_dst, $this->dst_img, $this->img_display_quality);
         }
         else
         {
             Return false;
         }
     }

     /**
      * 分析颜色
      *
      * @param    string     $color    十六进制颜色
      */
     function _parseColor($color)
     {
         $arr = array();
         for($ii=1; $ii<strlen ($color); $ii++)
         {
             $arr[] = hexdec(substr($color,$ii,2));
             $ii++;
         }

         Return $arr;
     }

     /**
      * 计算出位置坐标
      */
     function _countMaskPos()
     {
         if($this->_isFull())
         {
             switch($this->mask_position)
             {
                 case 1:
                     // 左上
                     $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                     $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                     break;

                 case 2:
                     // 左下
                     $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                     $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;
                     break;

                 case 3:
                     // 右上
                     $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                     $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                     break;

                 case 4:
                     // 右下
                     $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                     $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;
                     break;

                 default:
                     // 默认将水印放到右下,偏移指定像素
                     $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                     $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;
                     break;
             }
         }
         else
         {
             switch($this->mask_position)
             {
                 case 1:
                     // 左上
                     $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                     $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                     break;

                 case 2:
                     // 左下
                     $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                     $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;
                     break;

                 case 3:
                     // 右上
                     $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                     $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                     break;

                 case 4:
                     // 右下
                     $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                     $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;
                     break;

                 default:
                     // 默认将水印放到右下,偏移指定像素
                     $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                     $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;
                     break;
             }
         }
     }

     /**
      * 设置字体信息
      */
     function _setFontInfo()
     {
         if(is_numeric($this->font))
         {
             $this->font_w  = imagefontwidth($this->font);
             $this->font_h  = imagefontheight($this->font);

             // 计算水印字体所占宽高
             $word_length   = strlen($this->mask_word);
             $this->mask_w  = $this->font_w*$word_length;
             $this->mask_h  = $this->font_h;
         }
         else
         {
             $arr = imagettfbbox ($this->font_size,0, $this->font,$this->mask_word);
             $this->mask_w  = abs($arr[0] - $arr[2]);
             $this->mask_h  = abs($arr[7] - $arr[1]);
         }
     }

     /**
      * 设置新图尺寸
      *
      * @param    integer     $img_w   目标宽度
      * @param    integer     $img_h   目标高度
      */
     function _setNewImgSize($img_w, $img_h=null)
     {
         $num = func_num_args();
         if(1 == $num)
         {
             $this->img_scale = $img_w;// 宽度作为比例
             $this->fill_w = round($this->src_w * $this->img_scale / 100) - $this->img_border_size*2;
             $this->fill_h = round($this->src_h * $this->img_scale / 100) - $this->img_border_size*2;

             // 源文件起始坐标
             $this->src_x  = 0;
             $this->src_y  = 0;
             $this->copy_w = $this->src_w;
             $this->copy_h = $this->src_h;

             // 目标尺寸
             $this->dst_w   = $this->fill_w + $this->img_border_size*2;
             $this->dst_h   = $this->fill_h + $this->img_border_size*2;
         }

         if(2 == $num)
         {
             $fill_w   = (int)$img_w - $this->img_border_size*2;
             $fill_h   = (int)$img_h - $this->img_border_size*2;
             if($fill_w < 0 || $fill_h < 0)
             {
                 die("图片边框过大，已超过了图片的宽度");
             }
             $rate_w = $this->src_w/$fill_w;
             $rate_h = $this->src_h/$fill_h;

             switch($this->cut_type)
             {
                 case 0:
                     // 如果原图大于缩略图，产生缩小，否则不缩小
                     if($rate_w < 1 && $rate_h < 1)
                     {
                         $this->fill_w = (int)$this->src_w;
                         $this->fill_h = (int)$this->src_h;
                     }
                     else
                     {
                         if($rate_w >= $rate_h)
                         {
                             $this->fill_w = (int)$fill_w;
                             $this->fill_h = round($this->src_h/$rate_w);
                         }
                         else
                         {
                             $this->fill_w = round($this->src_w/$rate_h);
                             $this->fill_h = (int)$fill_h;
                         }
                     }

                     $this->src_x  = 0;
                     $this->src_y  = 0;

                     $this->copy_w = $this->src_w;
                     $this->copy_h = $this->src_h;

                     // 目标尺寸
                     $this->dst_w   = $this->fill_w + $this->img_border_size*2;
                     $this->dst_h   = $this->fill_h + $this->img_border_size*2;
                     break;

                 // 自动裁切
                 case 1:
                     // 如果图片是缩小剪切才进行操作
                     if($rate_w >= 1 && $rate_h >=1)
                     {
                         if($this->src_w > $this->src_h)
                         {
                             $src_x = round($this->src_w-$this->src_h)/2;
                             $this->setSrcCutPosition($src_x, 0);
                             $this->setRectangleCut($fill_h, $fill_h);

                             $this->copy_w = $this->src_h;
                             $this->copy_h = $this->src_h;

                         }
                         elseif($this->src_w < $this->src_h)
                         {
                             $src_y = round($this->src_h-$this->src_w)/2;
                             $this->setSrcCutPosition(0, $src_y);
                             $this->setRectangleCut($fill_w, $fill_h);

                             $this->copy_w = $this->src_w;
                             $this->copy_h = $this->src_w;
                         }
                         else
                         {
                             $this->setSrcCutPosition(0, 0);
                             $this->copy_w = $this->src_w;
                             $this->copy_h = $this->src_w;
                             $this->setRectangleCut($fill_w, $fill_h);
                         }
                     }
                     else
                     {
                         $this->setSrcCutPosition(0, 0);
                         $this->setRectangleCut($this->src_w, $this->src_h);

                         $this->copy_w = $this->src_w;
                         $this->copy_h = $this->src_h;
                     }

                     // 目标尺寸
                     $this->dst_w   = $this->fill_w + $this->img_border_size*2;
                     $this->dst_h   = $this->fill_h + $this->img_border_size*2;

                     break;

                 // 手工裁切
                 case 2:
                     $this->copy_w = $this->fill_w;
                     $this->copy_h = $this->fill_h;

                     // 目标尺寸
                     $this->dst_w   = $this->fill_w + $this->img_border_size*2;
                     $this->dst_h   = $this->fill_h + $this->img_border_size*2;                

                     break;
                 default:
                     break;

             }
         }

         // 目标文件起始坐标
         $this->start_x = $this->img_border_size;
         $this->start_y = $this->img_border_size;
     }

     /**
      * 检查水印图是否大于生成后的图片宽高
      */
     function _isFull()
     {
         Return (   $this->mask_w + $this->mask_offset_x > $this->fill_w
                 || $this->mask_h + $this->mask_offset_y > $this->fill_h)
                    ?true:false;
     }

     /**
      * 检查水印图是否超过原图
      */
     function _checkMaskValid()
     {
         if(    $this->mask_w + $this->mask_offset_x > $this->src_w
             || $this->mask_h + $this->mask_offset_y > $this->src_h)
         {
             die("水印图片尺寸大于原图，请缩小水印图");
         }
     }

     /**
      * 取得图片类型
      *
      * @param    string     $file_path    文件路径
      */
     function _getImgType($file_path)
     {
         $type_list = array("1"=>"gif","2"=>"jpg","3"=>"png","4"=>"swf","5" => "psd","6"=>"bmp","15"=>"wbmp");
         if(file_exists($file_path))
         {
             $img_info = @getimagesize ($file_path);
             if(isset($type_list[$img_info[2]]))
             {
                 Return $type_list[$img_info[2]];
             }
         }
         else
         {
             die("文件不存在,不能取得文件类型!");
         }
     }

     /**
      * 检查图片类型是否合法,调用了array_key_exists函数，此函数要求
      * php版本大于4.1.0
      *
      * @param    string     $img_type    文件类型
      */
     function _checkValid($img_type)
     {
         if(!array_key_exists($img_type, $this->all_type))
         {
             Return false;
         }
     }

     /**
      * 按指定路径生成目录
      *
      * @param    string     $path    路径
      */
     function _mkdirs($path)
     {
         $adir = explode('/',$path);
         $dirlist = '';
         $rootdir = array_shift($adir);
         if(($rootdir!='.'||$rootdir!='..')&&!file_exists($rootdir))
         {
             @mkdir($rootdir);
         }
         foreach($adir as $key=>$val)
         {
             if($val!='.'&&$val!='..')
             {
                 $dirlist .= "/".$val;
                 $dirpath = $rootdir.$dirlist;
                 if(!file_exists($dirpath))
                 {
                     @mkdir($dirpath);
                     @chmod($dirpath,0777);
                 }
             }
         }
     }

     /**
      * 垂直翻转
      *
      * @param    string     $src    图片源
      */
     function _flipV($src)
     {
         $src_x = $this->getImgWidth($src);
         $src_y = $this->getImgHeight($src);

         $new_im = imagecreatetruecolor($src_x, $src_y);
         for ($y = 0; $y < $src_y; $y++)
         {
             imagecopy($new_im, $src, 0, $src_y - $y - 1, 0, $y, $src_x, 1);
         }
         $this->h_src = $new_im;
     }

     /**
      * 水平翻转
      *
      * @param    string     $src    图片源
      */
     function _flipH($src)
     {
         $src_x = $this->getImgWidth($src);
         $src_y = $this->getImgHeight($src);

         $new_im = imagecreatetruecolor($src_x, $src_y);
         for ($x = 0; $x < $src_x; $x++)
         {
             imagecopy($new_im, $src, $src_x - $x - 1, 0, $x, 0, 1, $src_y);
         }
         $this->h_src = $new_im;
     }
 }
 ?>
 使用实例:

 < ?php
 require_once('lib/thumb.class.php');

 $t = new ThumbHandler();

 $t->setSrcImg("img/test.jpg");
 $t->setDstImg("tmp/new_test.jpg");
 $t->setMaskImg("img/test.gif");
 $t->setMaskPosition(1);
 $t->setMaskImgPct(80);
 $t->setDstImgBorder(4,"#dddddd");

 // 指定缩放比例
 $t->createImg(300,200);
 ?>
 < ?php
 require_once('lib/thumb.class.php');

 $t = new ThumbHandler();

 // 基本使用
 $t->setSrcImg("img/test.jpg");
 $t->setMaskWord("test");
 $t->setDstImgBorder(10,"#dddddd");

 // 指定缩放比例
 $t->createImg(50);
 ?>
 < ?php
 equire_once('lib/thumb.class.php');

 $t = new ThumbHandler();

 // 基本使用
 $t->setSrcImg("img/test.jpg");
 $t->setMaskWord("test");

 // 指定固定宽高
 $t->createImg(200,200);
 ?>
 < ?php
 require_once('lib/thumb.class.php');

 $t = new ThumbHandler();

 $t->setSrcImg("img/test.jpg");
 $t->setDstImg("tmp/new_test.jpg");
 $t->setMaskWord("test");

 // 指定固定宽高
 $t->createImg(200,200);
 ?>
 < ?php
 require_once('lib/thumb.class.php');

 $t = new ThumbHandler();

 $t->setSrcImg("img/test.jpg");

 // 指定字体文件地址
 $t->setMaskFont("c:/winnt/fonts/arial.ttf");
 $t->setMaskFontSize(20);
 $t->setMaskFontColor("#ffff00");
 $t->setMaskWord("test3333333");
 $t->setDstImgBorder(99,"#dddddd");
 $t->createImg(50);

 ?>
 < ?php
 require_once('lib/thumb.class.php');

 $t = new ThumbHandler();

 $t->setSrcImg("img/test.jpg");
 $t->setMaskOffsetX(55);
 $t->setMaskOffsetY(55);
 $t->setMaskPosition(1);
 //$t->setMaskPosition(2);
 //$t->setMaskPosition(3);
 //$t->setMaskPosition(4);
 $t->setMaskFontColor("#ffff00");
 $t->setMaskWord("test");

 // 指定固定宽高
 $t->createImg(50);
 ?>
 < ?php
 require_once('lib/thumb.class.php');

 $t = new ThumbHandler();

 $t->setSrcImg("img/test.jpg");
 $t->setMaskFont("c:/winnt/fonts/simyou.ttf");
 $t->setMaskFontSize(20);
 $t->setMaskFontColor("#ffffff");
 $t->setMaskTxtPct(20);
 $t->setDstImgBorder(10,"#dddddd");
 $text = "中文";
 $str = mb_convert_encoding($text, "UTF-8", "gb2312");
 $t->setMaskWord($str);
 $t->setMaskWord("test");

 // 指定固定宽高
 $t->createImg(50);
 ?>
 </strlen>