image添加水印类

<?phpclass imagelogo{var $input_image_file = ""; //输入图片的文件名var $output_image_file = ""; //生成文件的名称var $logo_image_name = ""; //包含存放路径的水印图片的文件名var $logo_text = ""; //水印文字var $logo_text_size = 18; //水印文字大小var $logo_text_angle = 4; //水印文字角度var $logo_text_pos = 6; //水印文字放置位置var $logo_text_font = ""; //水印文字的字体var $logo_text_color = "#ffffff"; //水印字体的颜色值var $logo_image_pos = 6; //水印图片放置的位置//1 = 顶部居左，2 = 顶部居中，3 = 顶部居右，4 = 底部居左//5 = 底部居中，6 = 底部居右，7 = 中间居左，8 = 居中，9 = 中间居右var $logo_image_transition = 25; //水印图片与原图片的融合度(1=100)var $jpeg_quality = 75; //jpeg图片的质量//生成水印图片function create($filename=""){if ($filename) $this->input_image_file = strtolower(trim($filename));$src_image_type = $this->get_type($this->input_image_file);$src_image = $this->createImage($src_image_type,$this->input_image_file);if (!$src_image) return;$src_image_w=imagesx($src_image);$src_image_h=imagesy($src_image);//开始处理水印logo图片信息，把两个图片合成为一个图片if ($this->logo_image_name){$this->logo_image_name = strtolower(trim($this->logo_image_name));$logo_image_type = $this->get_type($this->logo_image_name);$logo_image = $this->createImage($logo_image_type,$this->logo_image_name);$logo_image_w=imagesx($logo_image);$logo_image_h=imagesy($logo_image);$temp_logo_image = $this->getPos($src_image_w,$src_image_h,$this->logo_image_pos,$logo_image);$logo_image_x = $temp_logo_image["dest_x"];$logo_image_y = $temp_logo_image["dest_y"];imagecopymerge($src_image, $logo_image,$logo_image_x,$logo_image_y,0,0,$logo_image_w,$logo_image_h,$this->logo_image_transition);}//水印为纯文本if ($this->logo_text){$this->logo_text = $this->gb2utf8($this->logo_text);$temp_logo_text = $this->getPos($src_image_w,$src_image_h,$this->logo_text_pos);$logo_text_x = $temp_logo_text["dest_x"];$logo_text_y = $temp_logo_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->logo_text_color, $color)){$red = hexdec($color[1]);$green = hexdec($color[2]);$blue = hexdec($color[3]);$logo_text_color = imagecolorallocate($src_image, $red,$green,$blue);}else{$logo_text_color = imagecolorallocate($src_image, 255,255,255);}//用TrueType字体向图像写入文本imagettftext($src_image, $this->logo_text_size, $this->logo_angle, $logo_text_x, $logo_text_y, $logo_text_color,$this->logo_text_font, $this->logo_text);}//保存生成的图片为新的文件if ($this->output_image_file){switch ($this->get_type($this->output_image_file)){case 'gif':$src_img=imagegif($src_image, $this->output_image_file); break;case 'jpeg':$src_img=imagejpeg($src_image, $this->output_image_file, $this->jpeg_quality); break;case 'png':$src_img=imagepng($src_image, $this->output_image_file); break;default:$src_img=imagejpeg($src_image, $this->output_image_file, $this->jpeg_quality); break;}}else{//在原来图片的基础上生成新的合成图片if ($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 $tmp_img;}//根据源图像的长、宽，位置代码，水印图片id来生成把水印放置到源图像中的位置function getPos($sourcefile_width,$sourcefile_height,$pos,$logo_image=""){if ($logo_image){$insertfile_width = imagesx($logo_image);$insertfile_height = imagesy($logo_image);}else {$lineCount = explode("/r/n",$this->logo_text);$fontSize = imagettfbbox($this->logo_text_size,$this->logo_text_angle,$this->logo_text_font,$this->logo_text);$insertfile_width = $fontSize[2] - $fontSize[0];$insertfile_height = count($lineCount)*($fontSize[1] - $fontSize[3]);}switch ($pos){case 1://顶部居左$dest_x = 0;if ($this->logo_text){$dest_y = $insertfile_height;}else{$dest_y = 0;}break;case 2://顶部居中$dest_x = ( ( $sourcefile_width - $insertfile_width ) / 2 );if ($this->logo_text){$dest_y = $insertfile_height;}else{$dest_y = 0;}break;case 3://顶部居右$dest_x = $sourcefile_width - $insertfile_width;if ($this->logo_text){$dest_y = $insertfile_height;}else{$dest_y = 0;}break;case 4://底部居左$dest_x = 0;$dest_y = $sourcefile_height - $insertfile_height;break;case 5://底部居中$dest_x = ( ( $sourcefile_width - $insertfile_width ) / 2 );$dest_y = $sourcefile_height - $insertfile_height;break;case 6://底部居右$dest_x = $sourcefile_width - $insertfile_width;$dest_y = $sourcefile_height - $insertfile_height;break;case 7://中间居左$dest_x = 0;$dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );break;case 8://居中$dest_x = ( $sourcefile_width / 2 ) - ( $insertfile_width / 2 );$dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );break;case 9://中间居右$dest_x = $sourcefile_width - $insertfile_width;$dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );break;default://底部居右$dest_x = $sourcefile_width - $insertfile_width;$dest_y = $sourcefile_height - $insertfile_height;break;}return array("dest_x"=>$dest_x,"dest_y"=>$dest_y);}//获取图片的格式，主要包括jpg,png和giffunction get_type($img_name){$name_array = explode(".",$img_name);if (preg_match("//.(gif|jpg|jpeg|png)$/", $img_name, $matches)){$type = strtolower($matches[1]);}else{$type = "string";}return $type;}//指定的文字转换为UTF-8格式，使用gb2312保证中文的正常显示function gb2utf8($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 $utf8;}//转换为UTF8编码function u2utf8($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;}}?>