watermark.inc.php

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<?php
/**
 * 需要GD库支持
 */
Class Gimage{
    var $src_image_name = "";       //输入图片的文件名(必须包含路径名)
    var $jpeg_quality = 90;         //jpeg图片质量
    var $save_image_file = '';      //输出文件名
    var $wm_image_name = "";        //水印图片的文件名(必须包含路径名)
    var $wm_image_pos = 5;          //水印图片放置的位置
    // 0 = middle
    // 1 = top left
    // 2 = top right
    // 3 = bottom right
    // 4 = bottom left
    // 5 = top middle
    // 6 = middle right
    // 7 = bottom middle
    // 8 = middle left
    //other = 3
    var $wm_image_transition = 20;  //水印图片与原图片的融合度 (1=100)
    
    var $wm_text = "";              //水印文字(支持中英文以及带有\r\n的跨行文字)
    var $wm_text_size = 20;         //水印文字大小
    var $wm_text_angle = 4;         //水印文字角度,这个值尽量不要更改
    var $wm_text_pos = 3;           //水印文字放置位置
    var $wm_text_font = "";         //水印文字的字体
    var $wm_text_color = "#cccccc"; //水印字体的颜色值
    
    function create($filename="")
    {
        if ($filename) $this->src_image_name = strtolower(trim($filename));
        
        $src_image_type = $this->get_type($this->src_image_name);
        $src_image = $this->createImage($src_image_type,$this->src_image_name);
        if (!$src_image) return;
        $src_image_w=ImageSX($src_image);
        $src_image_h=ImageSY($src_image);
        
    
        if ($this->wm_image_name){
            $this->wm_image_name = strtolower(trim($this->wm_image_name));
            $wm_image_type = $this->get_type($this->wm_image_name);
            $wm_image = $this->createImage($wm_image_type,$this->wm_image_name);
            $wm_image_w=ImageSX($wm_image);
            $wm_image_h=ImageSY($wm_image);
            $temp_wm_image = $this->getPos($src_image_w,$src_image_h,$this->wm_image_pos,$wm_image);
            $wm_image_x = $temp_wm_image["dest_x"];
            $wm_image_y = $temp_wm_image["dest_y"];
            imageCopyMerge($src_image, $wm_image,$wm_image_x,$wm_image_y,0,0,$wm_image_w,$wm_image_h,$this->wm_image_transition);
        }
    
        if ($this->wm_text){
            //$this->wm_text = $this->gb2utf8($this->wm_text);
            //$this->wm_text = $this->gb2utf8($this->wm_text);
            $temp_wm_text = $this->getPos($src_image_w,$src_image_h,$this->wm_text_pos);
            $wm_text_x = $temp_wm_text["dest_x"];
            $wm_text_y = $temp_wm_text["dest_y"];
            if(preg_match("/([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])/i", $this->wm_text_color, $color))
            {
                $red = hexdec($color[1]);
                $green = hexdec($color[2]);
                $blue = hexdec($color[3]);
                $wm_text_color = imagecolorallocate($src_image, $red,$green,$blue);
            }else{
                $wm_text_color = imagecolorallocate($src_image, 255,255,255);
            }
            
            imagettftext($src_image, $this->wm_text_size, $this->wm_angle, $wm_text_x, $wm_text_y, $wm_text_color,$this->wm_text_font,  $this->wm_text);
        }
    
        if ($this->save_file) {
            switch ($this->output_type){
                case 'gif':$src_img=ImagePNG($src_image, $this->save_file); break;
                case 'jpeg':$src_img=ImageJPEG($src_image, $this->save_file, $this->jpeg_quality); break;
                case 'png':$src_img=ImagePNG($src_image, $this->save_file); break;
                default:$src_img=ImageJPEG($src_image, $this->save_file, $this->jpeg_quality); break;
            }
        } else {
            if ($src_image_type = "jpg") $src_image_type="jpeg";
                header("Content-type: image/{$src_image_type}");
                switch ($src_image_type){
                    case 'gif':$src_img=ImagePNG($src_image); break;
                    case 'jpg':$src_img=ImageJPEG($src_image, "", $this->jpeg_quality);break;
                    case 'png':$src_img=ImagePNG($src_image);break;
                    default:$src_img=ImageJPEG($src_image, "", $this->jpeg_quality);break;
                }
            }
        imagedestroy($src_image);
    }
    
    
    /**
     * 根据文件名和类型创建图片
     * 
     * @access private
     * @param string $type 图片的类型，包括gif,jpg,png
     * @param string $img_name 图片文件名，包括路径名，如"./mouse.jpg"
     * @return mixed $tmp_img 返回一图像标识符
     */
    function createImage($type,$img_name){
             if (!$type){
                  $type = $this->get_type($img_name);
             }
    
              switch ($type){
                      case 'gif':
                            if (function_exists('imagecreatefromgif'))
                                   $tmp_img=@ImageCreateFromGIF($img_name);
                            break;
                      case 'jpg':
                            $tmp_img=ImageCreateFromJPEG($img_name);
                            break;
                      case 'png':
                            $tmp_img=ImageCreateFromPNG($img_name);
                            break;
                      default:
                            $tmp_img=ImageCreateFromString($img_name);
                            break;
              }
              return $tmp_img;
    }
    
    
    /**
     * 根据源图像的长、宽，位置代码，水印图片id来生成把水印放置到源图像中的位置
     *
     * @access pravate
     * @param int $sourcefile_width 源图像的宽
     * @param int $sourcefile_height 原图像的高
     * @param int $pos  位置代码
     *  0 = middle
     *  1 = top left
     *  2 = top right
     *  3 = bottom right
     *  4 = bottom left
     *  5 = top middle
     *  6 = middle right
     *  7 = bottom middle
     *  8 = middle left
     * @param int $wm_image 水印图片ID
     * @return array 返回位置参数数组
     */
    function getPos($sourcefile_width,$sourcefile_height,$pos,$wm_image=""){
         if  ($wm_image){
              $insertfile_width = ImageSx($wm_image);
              $insertfile_height = ImageSy($wm_image);
         }else {
              $lineCount = explode("\r\n",$this->wm_text);
              $fontSize = imagettfbbox($this->wm_text_size,$this->wm_text_angle,$this->wm_text_font,$this->wm_text);
              $insertfile_width = $fontSize[2] - $fontSize[0];
              $insertfile_height = count($lineCount)*($fontSize[1] - $fontSize[3]);
         }
    
         switch ($pos){
            case 0:
               $dest_x = ( $sourcefile_width / 2 ) - ( $insertfile_width / 2 );
               $dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );
               break;
    
            case 1:
               $dest_x = 0;
               if ($this->wm_text){
                   $dest_y = $insertfile_height;
               }else{
                   $dest_y = 0;
               }
               break;
    
            case 2:
                $dest_x = $sourcefile_width - $insertfile_width;
                if ($this->wm_text){
                    $dest_y = $insertfile_height;
                }else{
                    $dest_y = 0;
                }
                break;
    
            case 3:
                $dest_x = $sourcefile_width - $insertfile_width;
                $dest_y = $sourcefile_height - $insertfile_height;
                break;
    
            case 4:
                $dest_x = 0;
                $dest_y = $sourcefile_height - $insertfile_height;
                break;
    
            case 5:
                $dest_x = ( ( $sourcefile_width - $insertfile_width ) / 2 );
                if ($this->wm_text){
                    $dest_y = $insertfile_height;
                }else{
                    $dest_y = 0;
                }
                break;
    
            case 6:
                $dest_x = $sourcefile_width - $insertfile_width;
                $dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );
                break;
    
            case 7:
                $dest_x = ( ( $sourcefile_width - $insertfile_width ) / 2 );
                $dest_y = $sourcefile_height - $insertfile_height;
                break;
    
            case 8:
                $dest_x = 0;
                $dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );
                break;
    
            default:
                $dest_x = $sourcefile_width - $insertfile_width;
                $dest_y = $sourcefile_height - $insertfile_height;
                break;
         }
        return array("dest_x"=>$dest_x,"dest_y"=>$dest_y);
    }
    
    /**
     * 指定的文字转换为UTF-8格式，包括中英文混合
     * 
     * @access private
     * @param string $gb 输入gb类型的字数串
     * @return string $utf8 
     */
    function gb2utf8($gb)
    {
        if(!trim($gb))
            return $gb;
        $filename="./gb2312.txt";
        $tmp=file($filename);
        $codetable=array();
        while(list($key,$value)=each($tmp))
        $codetable[hexdec(substr($value,0,6))]=substr($value,7,6);
        $utf8="";
        while($gb)
        {
            if (ord(substr($gb,0,1))>127) {
                $tthis=substr($gb,0,2);
                $gb=substr($gb,2,strlen($gb)-2);
                $utf8.=$this->u2utf8(hexdec($codetable[hexdec(bin2hex($tthis))-0x8080]));
            } else {
                $tthis=substr($gb,0,1);
                $gb=substr($gb,1,strlen($gb)-1);
                $utf8.=$this->u2utf8($tthis);
            }
        }
        return $utf8;
    }
    
    function u2utf8($c)
    {
        $str="";
        if ($c < 0x80) {
            $str.=$c;
        } else if ($c < 0x800) {
            $str.=chr(0xC0 | $c>>6);
            $str.=chr(0x80 | $c & 0x3F);
        } else if ($c < 0x10000) {
            $str.=chr(0xE0 | $c>>12);
            $str.=chr(0x80 | $c>>6 & 0x3F);
            $str.=chr(0x80 | $c & 0x3F);
        } else if ($c < 0x200000) {
            $str.=chr(0xF0 | $c>>18);
            $str.=chr(0x80 | $c>>12 & 0x3F);
            $str.=chr(0x80 | $c>>6 & 0x3F);
            $str.=chr(0x80 | $c & 0x3F);
        }
        return $str;
    }
    
    /**
     * 获得图片的格式，包括jpg,png,gif
     *
     * @access private
     * @param string $img_name 图片文件名，可以包括路径名
     * @return string $type
     */
    function get_type($img_name)
    {
        $name_array = explode(".",$img_name);
        if (preg_match("/\.(jpg|jpeg|gif|png)$/", $img_name, $matches))
            $type = strtolower($matches[1]);
        else
            $type = "string";
        
        return $type;
    }
 
}
/**
$img = new Gimage();
$img->wm_text = "ualink.ts";
$img->wm_text_font = "./arial.ttf";    //STXINWEI.TTF 是字体文件的路径名＋文件名
$img->create("./2.jpg");    //mouse.jpg是你要在其上添加水印的图片名称，注意包含路径名
$img->wm_text_size = 12;    //文字水印字体大小
$img->wm_image_name="test1.jpg";     //输出文件名
**/
?>