php工具类之【图像操作类库】

class Image {

    /**
      +----------------------------------------------------------
     * 取得图像信息
     *
      +----------------------------------------------------------
     * @static
     * @access public
      +----------------------------------------------------------
     * @param string $image 图像文件名
      +----------------------------------------------------------
     * @return mixed
      +----------------------------------------------------------
     */

    static function getImageInfo($img) {
        $imageInfo = getimagesize($img);
        if ($imageInfo !== 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;
        } else {
            return false;
        }
    }

    /**
      +----------------------------------------------------------
     * 为图片添加水印
      +----------------------------------------------------------
     * @static public
      +----------------------------------------------------------
     * @param string $source 原文件名
     * @param string $water  水印图片
     * @param string $$savename  添加水印后的图片名
     * @param string $alpha  水印的透明度
      +----------------------------------------------------------
     * @return void
      +----------------------------------------------------------
     */
    static public function water($source, $water, $savename=null, $alpha=80) {
        //检查文件是否存在
        if (!file_exists($source) || !file_exists($water))
            return false;

        //图片信息
        $sInfo = self::getImageInfo($source);
        $wInfo = self::getImageInfo($water);

        //如果图片小于水印图片，不生成图片
        if ($sInfo["width"] < $wInfo["width"] || $sInfo['height'] < $wInfo['height'])
            return false;

        //建立图像
        $sCreateFun = "imagecreatefrom" . $sInfo['type'];
        $sImage = $sCreateFun($source);
        $wCreateFun = "imagecreatefrom" . $wInfo['type'];
        $wImage = $wCreateFun($water);

        //设定图像的混色模式
        imagealphablending($wImage, true);

        //图像位置,默认为右下角右对齐
        $posY = $sInfo["height"] - $wInfo["height"];
        $posX = $sInfo["width"] - $wInfo["width"];

        //生成混合图像
        imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo['width'], $wInfo['height'], $alpha);

        //输出图像
        $ImageFun = 'Image' . $sInfo['type'];
        //如果没有给出保存文件名，默认为原图像名
        if (!$savename) {
            $savename = $source;
            @unlink($source);
        }
        //保存图像
        $ImageFun($sImage, $savename);
        imagedestroy($sImage);
    }

    function showImg($imgFile, $text='', $x='10', $y='10', $alpha='50') {
        //获取图像文件信息
        //2007/6/26 增加图片水印输出，$text为图片的完整路径即可
        $info = Image::getImageInfo($imgFile);
        if ($info !== false) {
            $createFun = str_replace('/', 'createfrom', $info['mime']);
            $im = $createFun($imgFile);
            if ($im) {
                $ImageFun = str_replace('/', '', $info['mime']);
                //水印开始
                if (!empty($text)) {
                    $tc = imagecolorallocate($im, 0, 0, 0);
                    if (is_file($text) && file_exists($text)) {//判断$text是否是图片路径
                        // 取得水印信息
                        $textInfo = Image::getImageInfo($text);
                        $createFun2 = str_replace('/', 'createfrom', $textInfo['mime']);
                        $waterMark = $createFun2($text);
                        //$waterMark=imagecolorallocatealpha($text,255,255,0,50);
                        $imgW = $info["width"];
                        $imgH = $info["width"] * $textInfo["height"] / $textInfo["width"];
                        //$y	=	($info["height"]-$textInfo["height"])/2;
                        //设置水印的显示位置和透明度支持各种图片格式
                        imagecopymerge($im, $waterMark, $x, $y, 0, 0, $textInfo['width'], $textInfo['height'], $alpha);
                    } else {
                        imagestring($im, 80, $x, $y, $text, $tc);
                    }
                    //ImageDestroy($tc);
                }
                //水印结束
                if ($info['type'] == 'png' || $info['type'] == 'gif') {
                    imagealphablending($im, FALSE); //取消默认的混色模式
                    imagesavealpha($im, TRUE); //设定保存完整的 alpha 通道信息
                }
                Header("Content-type: " . $info['mime']);
                $ImageFun($im);
                @ImageDestroy($im);
                return;
            }

            //保存图像
            $ImageFun($sImage, $savename);
            imagedestroy($sImage);
            //获取或者创建图像文件失败则生成空白PNG图片
            $im = imagecreatetruecolor(80, 30);
            $bgc = imagecolorallocate($im, 255, 255, 255);
            $tc = imagecolorallocate($im, 0, 0, 0);
            imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
            imagestring($im, 4, 5, 5, "no pic", $tc);
            Image::output($im);
            return;
        }
    }

    /**
      +----------------------------------------------------------
     * 生成缩略图
      +----------------------------------------------------------
     * @static
     * @access public
      +----------------------------------------------------------
     * @param string $image  原图
     * @param string $type 图像格式
     * @param string $thumbname 缩略图文件名
     * @param string $maxWidth  宽度
     * @param string $maxHeight  高度
     * @param string $position 缩略图保存目录
     * @param boolean $interlace 启用隔行扫描
      +----------------------------------------------------------
     * @return void
      +----------------------------------------------------------
     */
    static function thumb($image, $thumbname, $type='', $maxWidth=200, $maxHeight=50, $interlace=true) {
        // 获取原图信息
        $info = Image::getImageInfo($image);
        if ($info !== false) {
            $srcWidth = $info['width'];
            $srcHeight = $info['height'];
            $type = empty($type) ? $info['type']:$type;
            $type = strtolower($type);
            $interlace = $interlace ? 1 : 0;
            unset($info);
            $scale = min($maxWidth / $srcWidth, $maxHeight / $srcHeight); // 计算缩放比例
            if ($scale >= 1) {
                // 超过原图大小不再缩略
                $width = $srcWidth;
                $height = $srcHeight;
            } else {
                // 缩略图尺寸
                $width = (int) ($srcWidth * $scale);
                $height = (int) ($srcHeight * $scale);
            }

            // 载入原图
            if($type!='bmp')
            {
            	$createFun = 'ImageCreateFrom'.($type == 'jpg' ? 'jpeg' : $type);
            	$srcImg = $createFun($image);
            }else{
            	$srcImg = self::ImageCreateFromBMP($image);
            }
         
            //创建缩略图
            if ($type != 'gif' && function_exists('imagecreatetruecolor'))
                $thumbImg = imagecreatetruecolor($width, $height);
            else
                $thumbImg = imagecreate($width, $height);
 
            // 复制图片
            if (function_exists("ImageCopyResampled"))
                imagecopyresampled($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth, $srcHeight);
            else
                imagecopyresized($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth, $srcHeight);
            if ('gif' == $type || 'png' == $type) {
                //imagealphablending($thumbImg, false);//取消默认的混色模式
                //imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息
                $background_color = imagecolorallocate($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
            }

            // 对jpeg图形设置隔行扫描
            if ('jpg' == $type || 'jpeg' == $type)
                imageinterlace($thumbImg, $interlace);

            // 生成图片
            if($type!='bmp'){
            	$imageFun = 'image' . ($type == 'jpg' ? 'jpeg' : $type);
            	$imageFun($thumbImg, $thumbname);
            }else{
            	self::imagebmp($thumbImg, $thumbname);
            }
            
            imagedestroy($thumbImg);
            imagedestroy($srcImg);
            return $thumbname;
        }
        return false;
    }

    /**
      +----------------------------------------------------------
     * 根据给定的字符串生成图像
      +----------------------------------------------------------
     * @static
     * @access public
      +----------------------------------------------------------
     * @param string $string  字符串
     * @param string $size  图像大小 width,height 或者 array(width,height)
     * @param string $font  字体信息 fontface,fontsize 或者 array(fontface,fontsize)
     * @param string $type 图像格式 默认PNG
     * @param integer $disturb 是否干扰 1 点干扰 2 线干扰 3 复合干扰 0 无干扰
     * @param bool $border  是否加边框 array(color)
      +----------------------------------------------------------
     * @return string
      +----------------------------------------------------------
     */
    static function buildString($string, $rgb=array(), $filename='', $type='png', $disturb=1, $border=true) {
        if (is_string($size))
            $size = explode(',', $size);
        $width = $size[0];
        $height = $size[1];
        if (is_string($font))
            $font = explode(',', $font);
        $fontface = $font[0];
        $fontsize = $font[1];
        $length = strlen($string);
        $width = ($length * 9 + 10) > $width ? $length * 9 + 10 : $width;
        $height = 22;
        if ($type != 'gif' && function_exists('imagecreatetruecolor')) {
            $im = @imagecreatetruecolor($width, $height);
        } else {
            $im = @imagecreate($width, $height);
        }
        if (empty($rgb)) {
            $color = imagecolorallocate($im, 102, 104, 104);
        } else {
            $color = imagecolorallocate($im, $rgb[0], $rgb[1], $rgb[2]);
        }
        $backColor = imagecolorallocate($im, 255, 255, 255);    //背景色（随机）
        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色
        $pointColor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));                 //点颜色

        @imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);
        @imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);
        @imagestring($im, 5, 5, 3, $string, $color);
        if (!empty($disturb)) {
            // 添加干扰
            if ($disturb = 1 || $disturb = 3) {
                for ($i = 0; $i < 25; $i++) {
                    imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $pointColor);
                }
            } elseif ($disturb = 2 || $disturb = 3) {
                for ($i = 0; $i < 10; $i++) {
                    imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $pointColor);
                }
            }
        }
        Image::output($im, $type, $filename);
    }

    /**
      +----------------------------------------------------------
     * 生成图像验证码
      +----------------------------------------------------------
     * @static
     * @access public
      +----------------------------------------------------------
     * @param string $length  位数
     * @param string $mode  类型
     * @param string $type 图像格式
     * @param string $width  宽度
     * @param string $height  高度
      +----------------------------------------------------------
     * @return string
      +----------------------------------------------------------
     */
    static function buildImageVerify($length=4, $mode=1, $type='png', $width=48, $height=22, $verifyName='verify') {
        require_once './String.class.php';
        $randval = String::randString($length, $mode);
        $_SESSION[$verifyName] = md5($randval);
        $width = ($length * 10 + 10) > $width ? $length * 10 + 10 : $width;
        if ($type != 'gif' && function_exists('imagecreatetruecolor')) {
            $im = imagecreatetruecolor($width, $height);
        } else {
            $im = imagecreate($width, $height);
        }
        $r = Array(225, 255, 255, 223);
        $g = Array(225, 236, 237, 255);
        $b = Array(225, 236, 166, 125);
        $key = mt_rand(0, 3);

        $backColor = imagecolorallocate($im, $r[$key], $g[$key], $b[$key]);    //背景色（随机）
        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色
        imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);
        imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);
        $stringColor = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));
        // 干扰
        for ($i = 0; $i < 10; $i++) {
            imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $stringColor);
        }
        for ($i = 0; $i < 25; $i++) {
            imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $stringColor);
        }
        for ($i = 0; $i < $length; $i++) {
            imagestring($im, 5, $i * 10 + 5, mt_rand(1, 8), $randval{$i}, $stringColor);
        }
        Image::output($im, $type);
    }

    // 中文验证码
    static function GBVerify($length=4, $type='png', $width=180, $height=50, $fontface='simhei.ttf', $verifyName='verify') {
        require_once './String.class.php';
        $code = String::randString($length, 4);
        $width = ($length * 45) > $width ? $length * 45 : $width;
        $_SESSION[$verifyName] = md5($code);
        $im = imagecreatetruecolor($width, $height);
        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色
        $bkcolor = imagecolorallocate($im, 250, 250, 250);
        imagefill($im, 0, 0, $bkcolor);
        @imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);
        // 干扰
        for ($i = 0; $i < 15; $i++) {
            $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
            imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $fontcolor);
        }
        for ($i = 0; $i < 255; $i++) {
            $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
            imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $fontcolor);
        }
        if (!is_file($fontface)) {
            $fontface = dirname(__FILE__) . "/" . $fontface;
        }
        for ($i = 0; $i < $length; $i++) {
            $fontcolor = imagecolorallocate($im, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120)); //这样保证随机出来的颜色较深。
            $codex = String::msubstr($code, $i, 1);
            imagettftext($im, mt_rand(16, 20), mt_rand(-60, 60), 40 * $i + 20, mt_rand(30, 35), $fontcolor, $fontface, $codex);
        }
        Image::output($im, $type);
    }

    /**
      +----------------------------------------------------------
     * 把图像转换成字符显示
      +----------------------------------------------------------
     * @static
     * @access public
      +----------------------------------------------------------
     * @param string $image  要显示的图像
     * @param string $type  图像类型，默认自动获取
      +----------------------------------------------------------
     * @return string
      +----------------------------------------------------------
     */
    static function showASCIIImg($image, $string='', $type='') {
        $info = Image::getImageInfo($image);
        if ($info !== false) {
            $type = empty($type) ? $info['type'] : $type;
            unset($info);
            // 载入原图
            $createFun = 'ImageCreateFrom' . ($type == 'jpg' ? 'jpeg' : $type);
            $im = $createFun($image);
            $dx = imagesx($im);
            $dy = imagesy($im);
            $i = 0;
            $out = '<span style="padding:0px;margin:0;line-height:100%;font-size:1px;">';
            set_time_limit(0);
            for ($y = 0; $y < $dy; $y++) {
                for ($x = 0; $x < $dx; $x++) {
                    $col = imagecolorat($im, $x, $y);
                    $rgb = imagecolorsforindex($im, $col);
                    $str = empty($string) ? '*' : $string[$i++];
                    $out .= sprintf('<span style="margin:0px;color:#%02x%02x%02x">' . $str . '</span>', $rgb['red'], $rgb['green'], $rgb['blue']);
                }
                $out .= "<br>\n";
            }
            $out .= '</span>';
            imagedestroy($im);
            return $out;
        }
        return false;
    }

    /**
      +----------------------------------------------------------
     * 生成UPC-A条形码
      +----------------------------------------------------------
     * @static
      +----------------------------------------------------------
     * @param string $type 图像格式
     * @param string $type 图像格式
     * @param string $lw  单元宽度
     * @param string $hi   条码高度
      +----------------------------------------------------------
     * @return string
      +----------------------------------------------------------
     */
    static function UPCA($code, $type='png', $lw=2, $hi=100) {
        static $Lencode = array('0001101', '0011001', '0010011', '0111101', '0100011',
    '0110001', '0101111', '0111011', '0110111', '0001011');
        static $Rencode = array('1110010', '1100110', '1101100', '1000010', '1011100',
    '1001110', '1010000', '1000100', '1001000', '1110100');
        $ends = '101';
        $center = '01010';
        /* UPC-A Must be 11 digits, we compute the checksum. */
        if (strlen($code) != 11) {
            die("UPC-A Must be 11 digits.");
        }
        /* Compute the EAN-13 Checksum digit */
        $ncode = '0' . $code;
        $even = 0;
        $odd = 0;
        for ($x = 0; $x < 12; $x++) {
            if ($x % 2) {
                $odd += $ncode[$x];
            } else {
                $even += $ncode[$x];
            }
        }
        $code.= ( 10 - (($odd * 3 + $even) % 10)) % 10;
        /* Create the bar encoding using a binary string */
        $bars = $ends;
        $bars.=$Lencode[$code[0]];
        for ($x = 1; $x < 6; $x++) {
            $bars.=$Lencode[$code[$x]];
        }
        $bars.=$center;
        for ($x = 6; $x < 12; $x++) {
            $bars.=$Rencode[$code[$x]];
        }
        $bars.=$ends;
        /* Generate the Barcode Image */
        if ($type != 'gif' && function_exists('imagecreatetruecolor')) {
            $im = imagecreatetruecolor($lw * 95 + 30, $hi + 30);
        } else {
            $im = imagecreate($lw * 95 + 30, $hi + 30);
        }
        $fg = ImageColorAllocate($im, 0, 0, 0);
        $bg = ImageColorAllocate($im, 255, 255, 255);
        ImageFilledRectangle($im, 0, 0, $lw * 95 + 30, $hi + 30, $bg);
        $shift = 10;
        for ($x = 0; $x < strlen($bars); $x++) {
            if (($x < 10) || ($x >= 45 && $x < 50) || ($x >= 85)) {
                $sh = 10;
            } else {
                $sh = 0;
            }
            if ($bars[$x] == '1') {
                $color = $fg;
            } else {
                $color = $bg;
            }
            ImageFilledRectangle($im, ($x * $lw) + 15, 5, ($x + 1) * $lw + 14, $hi + 5 + $sh, $color);
        }
        /* Add the Human Readable Label */
        ImageString($im, 4, 5, $hi - 5, $code[0], $fg);
        for ($x = 0; $x < 5; $x++) {
            ImageString($im, 5, $lw * (13 + $x * 6) + 15, $hi + 5, $code[$x + 1], $fg);
            ImageString($im, 5, $lw * (53 + $x * 6) + 15, $hi + 5, $code[$x + 6], $fg);
        }
        ImageString($im, 4, $lw * 95 + 17, $hi - 5, $code[11], $fg);
        /* Output the Header and Content. */
        Image::output($im, $type);
    }

    static function output($im, $type='png', $filename='') {
        header("Content-type: image/" . $type);
        $ImageFun = 'image' . $type;
        if (empty($filename)) {
            $ImageFun($im);
        } else {
            $ImageFun($im, $filename);
        }
        imagedestroy($im);
    }
	/**
	 * 读取bmp格式的图片内容
	 * @param String $filename--图片路径
	 * @return boolean|resource
	 */
	private static function ImageCreateFromBMP($filename){
		// Ouverture du fichier en mode binaire  
		if (!$f1 = @fopen($filename,"rb")) 
			return FALSE ;  
		// 1 : Chargement des ent?tes FICHIER  
		$FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset",fread($f1 ,14));  
		if ( $FILE ['file_type'] != 19778 ) 
			return FALSE ;  
		// 2 : Chargement des ent?tes BMP  
		$BMP = unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
				'/Vcompression/Vsize_bitmap/Vhoriz_resolution' .  
          		'/Vvert_resolution/Vcolors_used/Vcolors_important',fread ( $f1 , 40 ));  
		$BMP [ 'colors' ] = pow(2,$BMP['bits_per_pixel']);  
		if($BMP['size_bitmap'] == 0) 
			$BMP ['size_bitmap']=$FILE ['file_size']-$FILE ['bitmap_offset'];  
		$BMP ['bytes_per_pixel'] = $BMP ['bits_per_pixel'] / 8 ;  
		$BMP ['bytes_per_pixel2'] = ceil ( $BMP ['bytes_per_pixel']);  
		$BMP ['decal'] = ( $BMP ['width']*$BMP ['bytes_per_pixel'] / 4 );  
		$BMP ['decal'] -= floor ( $BMP ['width'] * $BMP ['bytes_per_pixel'] / 4 );  
		$BMP ['decal'] = 4 - ( 4 * $BMP ['decal']);  
		if ( $BMP ['decal'] == 4 ) 
			$BMP ['decal'] = 0 ;  
		// 3 : Chargement des couleurs de la palette  
		$PALETTE = array ();  
		if ( $BMP ['colors'] < 16777216 ){  
			$PALETTE = unpack ( 'V' . $BMP ['colors'] , fread ( $f1 , $BMP ['colors'] * 4 ));  
		}  
		// 4 : Cr?ation de l'image  
		$IMG = fread ( $f1 , $BMP ['size_bitmap']);  
		$VIDE = chr ( 0 );  
		$res = imagecreatetruecolor( $BMP ['width'] , $BMP ['height']);  
		$P = 0 ;  
		$Y = $BMP ['height'] - 1 ;  
		while ( $Y >= 0 ){  
			$X = 0 ;  
			while ( $X < $BMP ['width']){  
				if ( $BMP ['bits_per_pixel'] == 24 )  
					$COLOR = @unpack ( "V" , substr($IMG,$P,3).$VIDE );  
				elseif ( $BMP['bits_per_pixel']== 16 ){  
					$COLOR = unpack ( "n" , substr ( $IMG , $P , 2 ));  
					$COLOR [1] = $PALETTE [ $COLOR [ 1 ] + 1 ];  
				}elseif ( $BMP['bits_per_pixel']== 8 ){  
					$COLOR = unpack ( "n" , $VIDE . substr ( $IMG , $P , 1 ));  
					$COLOR [1] = $PALETTE [ $COLOR [ 1 ] + 1 ];  
				}elseif ( $BMP['bits_per_pixel']== 4 ){  
					$COLOR = unpack ( "n" , $VIDE . substr ( $IMG , floor ( $P ) , 1 ));  
					if (( $P * 2 ) % 2 == 0 )  
						$COLOR [1] = ( $COLOR [1] >> 4 ) ;  
					else 
						$COLOR [1] = ( $COLOR [1] & 0x0F );  
					$COLOR [1] = $PALETTE [ $COLOR [1] + 1 ];  
				}elseif ( $BMP['bits_per_pixel']== 1 ){  
					$COLOR = unpack ( "n" , $VIDE . substr ( $IMG , floor ( $P ) , 1 ));  
					if (( $P * 8 ) % 8 == 0 ) $COLOR [ 1 ] = $COLOR [ 1 ] >> 7 ;  
					elseif (( $P * 8 ) % 8 == 1 ) $COLOR [1] = ( $COLOR [1] & 0x40 ) >> 6 ;  
					elseif (( $P * 8 ) % 8 == 2 ) $COLOR [1] = ( $COLOR [1] & 0x20 ) >> 5 ;  
					elseif (( $P * 8 ) % 8 == 3 ) $COLOR [1] = ( $COLOR [1] & 0x10 ) >> 4 ;  
					elseif (( $P * 8 ) % 8 == 4 ) $COLOR [1] = ( $COLOR [1] & 0x8 ) >> 3 ;  
					elseif (( $P * 8 ) % 8 == 5 ) $COLOR [1] = ( $COLOR [1] & 0x4 ) >> 2 ;  
					elseif (( $P * 8 ) % 8 == 6 ) $COLOR [1] = ( $COLOR [1] & 0x2 ) >> 1 ;  
					elseif (( $P * 8 ) % 8 == 7 ) $COLOR [1] = ( $COLOR [1] & 0x1 );  
					$COLOR [1] = $PALETTE [ $COLOR [1] + 1 ];  
				}else 
					return FALSE ;  
				imagesetpixel( $res , $X , $Y , $COLOR [ 1 ]);  
				$X ++ ;  
				$P += $BMP['bytes_per_pixel'];  
			}  
			$Y -- ;  
			$P += $BMP['decal'];  
		}  
		// Fermeture du fichier  
		fclose($f1);  
		return $res ;  
	} 
	/**
	 * 根据上传的bmp格式的图片，生成他的缩略图
	 * @param unknown_type $img
	 * @param String $filename--缩略图路径名称
	 * @return boolean
	 */
	private static function imagebmp(&$img,$filename = false)   
 	{   
   		$wid = imagesx($img);   
   		$hei = imagesy($img);   
   		$wid_pad = str_pad('',$wid%4,'\0');   
   		$size = 54 + ($wid + $wid_pad) * $hei;   
   		//prepare & save header   
   		$header['identifier']        = 'BM';   
   		$header['file_size']        = self::dword($size);   
     	$header['reserved']            = self::dword(0);   
  		$header['bitmap_data']        = self::dword(54);   
   		$header['header_size']        = self::dword(40);   
   		$header['width']            = self::dword($wid);   
   		$header['height']            = self::dword($hei);   
  		$header['planes']            = self::word(1);   
   		$header['bits_per_pixel']    = self::word(24);   
   		$header['compression']        = self::dword(0);   
   		$header['data_size']        = self::dword(0);   
   		$header['h_resolution']        = self::dword(0);   
   		$header['v_resolution']        = self::dword(0);   
   		$header['colors']            = self::dword(0);   
   		$header['important_colors']    = self::dword(0);
 		if($filename){		
			$f = fopen($filename, 'wb');		
			foreach ($header AS $h) {			
				fwrite($f, $h);		
			}		
			//save pixels		
			for ($y=$hei-1; $y>=0; $y--){			
				for ($x=0; $x<$wid; $x++) {				
					$rgb = imagecolorat($img, $x, $y);				
					fwrite($f, self::byte3($rgb));			
				}			
				fwrite($f, $wid_pad);		
			}		
			return fclose($f);	
 		}else{		
 			foreach ($header AS $h) {		    
 				echo $h;		
 			}		
 			//save pixels		
 			for ($y = $hei - 1; $y >= 0; $y--) {			
 				for ($x=0; $x<$wid; $x++) {				
 					$rgb = imagecolorat($img, $x, $y);				
 					echo self::byte3($rgb);			
 				}			
 				echo $wid_pad;		
 			}		
 			return true;	
 		}
 	} 
 	private static function byte3($n) {	
 		return chr($n & 255) . chr(($n >> 8) & 255) . chr(($n >> 16) & 255);    
 	}
 	private static function dword($n) {	
 		return pack("V", $n);
 	}
 	private static function word($n){	
 		return pack("v", $n);
 	}  
}

 该类库来自于：thinkphp