-
-
/** 缩略图生成类,支持imagemagick及gd库两种处理
- * Date: 2013-07-15
- * Author: fdipzone
- * Ver: 1.2
- * edit: bbs.it-home.org
- * Func:
- * public set_config: 设置参数
- * public create_thumb: 生成缩略图
- * private fit: 缩略图片
- * private crop: 裁剪图片
- * private gd_fit: GD库缩略图片
- * private gd_crop: GD库裁剪图片
- * private get_size: 获取要转换的size
- * private get_crop_offset: 获取裁图的偏移量
- * private add_watermark: 添加水印
- * private check_handler: 判断处理程序是否已安装
- * private create_dirs: 创建目录
- * private exists: 判断参数是否存在
- * private to_log: 记录log
- * private hex2rgb: hex颜色转rgb颜色
- * private get_file_ext: 获取图片类型
- *
- * ver: 1.1 增加GD库处理
- * ver: 1.2 增加width,height错误参数处理
- * 增加当图片colorspace不为RGB时作转RGB处理
- * 修正使用crop保存为gif时出现透明无效区域问题,使用+repage参数,删除透明无效区域即可
- *
- * tips:建议使用imagemagick
- * GD库不支持透明度水印,如果必须使用透明水印,请将水印图片做成有透明度。
- * GD库输出gif如加透明水印,会有问题。
- */
-
- class PicThumb{ // class start
-
- private $_log = null; // log file
- private $_handler = null; // 进行图片处理的程序,imagemagick/gd库
- private $_type = 'fit'; // fit or crop
- private $_source = null; // 原图路径
- private $_dest = null; // 缩略图路径
- private $_watermark = null; // 水印图片
- private $_opacity = 75; // 水印圖片透明度,gd库不支持
- private $_gravity = 'SouthEast'; // 水印摆放位置 NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast
- private $_geometry = '+10+10'; // 水印定位,gd库不支持
- private $_croppos = 'TL'; // 截图的位置 TL TM TR ML MM MR BL BM BR
- private $_bgcolor = null; // 填充的背景色
- private $_quality = 90; // 生成的图片质量
- private $_width = null; // 指定区域宽度
- private $_height = null; // 指定区域高度
-
-
- // 初始化
- public function __construct($logfile=''){
- if($logfile!=''){
- $this->_log = $logfile;
- }
- }
-
-
- // 设置参数
- public function set_config($param=array()){
- $this->_handler = $this->exists($param, 'handler')? strtolower($param['handler']) : null;
- $this->_type = $this->exists($param, 'type')? strtolower($param['type']) : 'fit';
- $this->_watermark = $this->exists($param, 'watermark')? $param['watermark'] : null;
- $this->_opacity = $this->exists($param, 'opacity')? $param['opacity'] : 75;
- $this->_gravity = $this->exists($param, 'gravity')? $param['gravity'] : 'SouthEast';
- $this->_geometry = $this->exists($param, 'geometry')? $param['geometry'] : '+10+10';
- $this->_croppos = $this->exists($param, 'croppos')? $param['croppos'] : 'TL';
- $this->_bgcolor = $this->exists($param, 'bgcolor')? $param['bgcolor'] : null;
- $this->_quality = $this->exists($param, 'quality')? $param['quality'] : 90;
- $this->_width = $this->exists($param, 'width')? $param['width'] : null;
- $this->_height = $this->exists($param, 'height')? $param['height'] : null;
- }
-
- /** 创建缩略图
- * @param String $source 原图
- * @param String $dest 目标图
- * @return boolean
- */
- public function create_thumb($source, $dest){
-
- // 检查使用的handler是否已安装
- if(!$this->check_handler()){
- $this->to_log('handler not installed');
- return false;
- }
-
- // 判断区域宽高是否正确
- if(!is_numeric($this->_width) || !is_numeric($this->_height) || $this->_width_height $this->to_log('width or height invalid');
- return false;
- }
-
- // 判断源文件是否存在
- if(!file_exists($source)){
- $this->to_log($source.' not exists');
- return false;
- }
-
- // 创建目标文件路径
- if(!$this->create_dirs($dest)){
- $this->to_log(dirname($dest).' create fail');
- return false;
- }
-
- $this->_source = $source; // 源文件
- $this->_dest = $dest; // 目标文件
-
- // 处理图片
- switch($this->_type){
- case 'fit':
- if($this->_handler=='imagemagick'){
- return $this->fit();
- }else{
- return $this->gd_fit();
- }
- break;
-
- case 'crop':
- if($this->_handler=='imagemagick'){
- return $this->crop();
- }else{
- return $this->gd_crop();
- }
- break;
-
- default:
- $this->to_log($this->_type.' not fit and crop');
- return false;
- }
-
- }
-
-
- /** 按比例压缩或拉伸图片
- * @return boolean
- */
- private function fit(){
-
- // 判断是否填充背景
- $bgcolor = ($this->_bgcolor!=null)?
- sprintf(" -background '%s' -gravity center -extent '%sx%s' ", $this->_bgcolor, $this->_width, $this->_height) : "";
-
- // 判断是否要转为RGB
- $source_info = getimagesize($this->_source);
- $colorspace = (!isset($source_info['channels']) || $source_info['channels']!=3)? ' -colorspace RGB ' : '';
-
- // 命令行
- $cmd = sprintf("convert -resize '%sx%s' '%s' %s -quality %s %s '%s'", $this->_width, $this->_height, $this->_source, $bgcolor, $this->_quality, $colorspace, $this->_dest);
-
- // 记录执行的命令
- $this->to_log($cmd);
-
- // 执行命令
- exec($cmd);
-
- // 添加水印
- $this->add_watermark($this->_dest);
-
- return is_file($this->_dest)? true : false;
-
- }
-
-
- /** 裁剪图片
- * @return boolean
- */
- private function crop(){
-
- // 获取生成的图片尺寸
- list($pic_w, $pic_h) = $this->get_size();
-
- // 获取截图的偏移量
- list($offset_w, $offset_h) = $this->get_crop_offset($pic_w, $pic_h);
-
- // 判断是否要转为RGB
- $source_info = getimagesize($this->_source);
- $colorspace = (!isset($source_info['channels']) || $source_info['channels']!=3)? ' -colorspace RGB ' : '';
-
- // 命令行
- $cmd = sprintf("convert -resize '%sx%s' '%s' -quality %s %s -crop %sx%s+%s+%s +repage '%s'", $pic_w, $pic_h, $this->_source, $this->_quality, $colorspace, $this->_width, $this->_height, $offset_w, $offset_h, $this->_dest);
-
- // 记录执行的命令
- $this->to_log($cmd);
-
- // 执行命令
- exec($cmd);
-
- // 添加水印
- $this->add_watermark($this->_dest);
-
- return is_file($this->_dest)? true : false;
-
- }
-
-
- /** GD库按比例压缩或拉伸图片
- * @return boolean
- */
- private function gd_fit(){
-
- // 获取生成的图片尺寸
- list($pic_w, $pic_h) = $this->get_size();
-
- list($owidth, $oheight, $otype) = getimagesize($this->_source);
-
- switch($otype){
- case 1: $source_img = imagecreatefromgif($this->_source); break;
- case 2: $source_img = imagecreatefromjpeg($this->_source); break;
- case 3: $source_img = imagecreatefrompng($this->_source); break;
- default: return false;
- }
-
- // 按比例缩略/拉伸图片
- $new_img = imagecreatetruecolor($pic_w, $pic_h);
- imagecopyresampled($new_img, $source_img, 0, 0, 0, 0, $pic_w, $pic_h, $owidth, $oheight);
-
- // 判断是否填充背景
- if($this->_bgcolor!=null){
- $bg_img = imagecreatetruecolor($this->_width, $this->_height);
- $rgb = $this->hex2rgb($this->_bgcolor);
- $bgcolor =imagecolorallocate($bg_img, $rgb['r'], $rgb['g'], $rgb['b']);
- imagefill($bg_img, 0, 0, $bgcolor);
- imagecopy($bg_img, $new_img, (int)(($this->_width-$pic_w)/2), (int)(($this->_height-$pic_h)/2), 0, 0, $pic_w, $pic_h);
- $new_img = $bg_img;
- }
-
- // 获取目标图片的类型
- $dest_ext = $this->get_file_ext($this->_dest);
-
- // 生成图片
- switch($dest_ext){
- case 1: imagegif($new_img, $this->_dest, $this->_quality); break;
- case 2: imagejpeg($new_img, $this->_dest, $this->_quality); break;
- case 3: imagepng($new_img, $this->_dest, (int)(($this->_quality-1)/10)); break;
- }
-
- if(isset($source_img)){
- imagedestroy($source_img);
- }
-
- if(isset($new_img)){
- imagedestroy($new_img);
- }
-
- // 添加水印
- $this->add_watermark($this->_dest);
-
- return is_file($this->_dest)? true : false;
-
- }
-
-
- /** GD库裁剪图片
- * @return boolean
- */
- private function gd_crop(){
-
- // 获取生成的图片尺寸
- list($pic_w, $pic_h) = $this->get_size();
-
- // 获取截图的偏移量
- list($offset_w, $offset_h) = $this->get_crop_offset($pic_w, $pic_h);
-
- list($owidth, $oheight, $otype) = getimagesize($this->_source);
-
- switch($otype){
- case 1: $source_img = imagecreatefromgif($this->_source); break;
- case 2: $source_img = imagecreatefromjpeg($this->_source); break;
- case 3: $source_img = imagecreatefrompng($this->_source); break;
- default: return false;
- }
-
- // 按比例缩略/拉伸图片
- $tmp_img = imagecreatetruecolor($pic_w, $pic_h);
- imagecopyresampled($tmp_img, $source_img, 0, 0, 0, 0, $pic_w, $pic_h, $owidth, $oheight);
-
- // 裁剪图片
- $new_img = imagecreatetruecolor($this->_width, $this->_height);
- imagecopyresampled($new_img, $tmp_img, 0, 0, $offset_w, $offset_h, $this->_width, $this->_height, $this->_width, $this->_height);
-
- // 获取目标图片的类型
- $dest_ext = $this->get_file_ext($this->_dest);
-
- // 生成图片
- switch($dest_ext){
- case 1: imagegif($new_img, $this->_dest, $this->_quality); break;
- case 2: imagejpeg($new_img, $this->_dest, $this->_quality); break;
- case 3: imagepng($new_img, $this->_dest, (int)(($this->_quality-1)/10)); break;
- }
-
- if(isset($source_img)){
- imagedestroy($source_img);
- }
-
- if(isset($tmp_img)){
- imagedestroy($tmp_img);
- }
-
- if(isset($new_img)){
- imagedestroy($new_img);
- }
-
- // 添加水印
- $this->add_watermark($this->_dest);
-
- return is_file($this->_dest)? true : false;
-
- }
-
-
- /** 获取目标图生成的size
- * @return Array $width, $height
- */
- private function get_size(){
- list($owidth, $oheight) = getimagesize($this->_source);
- $width = (int)($this->_width);
- $height = (int)($this->_height);
-
- switch($this->_type){
- case 'fit':
- $pic_w = $width;
- $pic_h = (int)($pic_w*$oheight/$owidth);
- if($pic_h>$height){
- $pic_h = $height;
- $pic_w = (int)($pic_h*$owidth/$oheight);
- }
- break;
- case 'crop':
- if($owidth>$oheight){
- $pic_h = $height;
- $pic_w = (int)($pic_h*$owidth/$oheight);
- }else{
- $pic_w = $width;
- $pic_h = (int)($pic_w*$oheight/$owidth);
- }
- break;
- }
-
- return array($pic_w, $pic_h);
- }
-
-
- /** 获取截图的偏移量
- * @param int $pic_w 图宽度
- * @param int $pic_h 图高度
- * @return Array $offset_w, $offset_h
- */
- private function get_crop_offset($pic_w, $pic_h){
- $offset_w = 0;
- $offset_h = 0;
-
- switch(strtoupper($this->_croppos)){
- case 'TL':
- $offset_w = 0;
- $offset_h = 0;
- break;
-
- case 'TM':
- $offset_w = (int)(($pic_w-$this->_width)/2);
- $offset_h = 0;
- break;
-
- case 'TR':
- $offset_w = (int)($pic_w-$this->_width);
- $offset_h = 0;
- break;
-
- case 'ML':
- $offset_w = 0;
- $offset_h = (int)(($pic_h-$this->_height)/2);
- break;
-
- case 'MM':
- $offset_w = (int)(($pic_w-$this->_width)/2);
- $offset_h = (int)(($pic_h-$this->_height)/2);
- break;
-
- case 'MR':
- $offset_w = (int)($pic_w-$this->_width);
- $offset_h = (int)(($pic_h-$this->_height)/2);
- break;
-
- case 'BL':
- $offset_w = 0;
- $offset_h = (int)($pic_h-$this->_height);
- break;
-
- case 'BM':
- $offset_w = (int)(($pic_w-$this->_width)/2);
- $offset_h = (int)($pic_h-$this->_height);
- break;
-
- case 'BR':
- $offset_w = (int)($pic_w-$this->_width);
- $offset_h = (int)($pic_h-$this->_height);
- break;
- }
-
- return array($offset_w, $offset_h);
- }
-
-
- /** 添加水印
- * @param String $dest 图片路径
- */
- private function add_watermark($dest){
- if($this->_watermark!=null && file_exists($this->_watermark) && file_exists($dest)){
- list($owidth, $oheight, $otype) = getimagesize($dest);
- list($w, $h, $wtype) = getimagesize($this->_watermark);
-
- // 水印图比原图要小才加水印
- if($w
- if($this->_handler=='imagemagick'){ // imagemagick 添加水印
-
- $cmd = sprintf("composite -gravity %s -geometry %s -dissolve %s '%s' %s %s", $this->_gravity, $this->_geometry, $this->_opacity, $this->_watermark, $dest, $dest);
-
- $this->to_log($cmd);
-
- exec($cmd);
-
- }else{ // gd 添加水印
-
- switch($wtype){
- case 1: $water_img = imagecreatefromgif($this->_watermark); break;
- case 2: $water_img = imagecreatefromjpeg($this->_watermark); break;
- case 3: $water_img = imagecreatefrompng($this->_watermark); break;
- default: return false;
- }
-
- switch($otype){
- case 1: $dest_img = imagecreatefromgif($dest); break;
- case 2: $dest_img = imagecreatefromjpeg($dest); break;
- case 3: $dest_img = imagecreatefrompng($dest); break;
- default: return false;
- }
-
- // 水印位置
- switch(strtolower($this->_gravity)){
- case 'northwest':
- $posX = 0;
- $posY = 0;
- break;
- case 'north':
- $posX = ($owidth - $w) / 2;
- $posY = 0;
- break;
- case 'northeast':
- $posX = $owidth - $w;
- $posY = 0;
- break;
- case 'west':
- $posX = 0;
- $posY = ($oheight - $h) / 2;
- break;
- case 'center':
- $posX = ($owidth - $w) / 2;
- $posY = ($oheight - $h) / 2;
- break;
- case 'east':
- $posX = $owidth - $w;
- $posY = ($oheight - $h) / 2;
- break;
- case 'southwest':
- $posX = 0;
- $posY = $oheight - $h;
- break;
- case 'south':
- $posX = ($owidth - $w) / 2;
- $posY = $oheight - $h;
- break;
- case 'southeast':
- $posX = $owidth - $w;
- $posY = $oheight - $h;
- break;
- }
-
- imagealphablending($dest_img, true);
- imagecopy($dest_img, $water_img, $posX, $posY, 0, 0, $w, $h);
-
- switch($otype){
- case 1:imagegif($dest_img, $dest, $this->_quality); break;
- case 2:imagejpeg($dest_img, $dest, $this->_quality); break;
- case 3:imagepng($dest_img, $dest, (int)(($this->_quality-1)/10)); break;
- }
-
- if(isset($water_img)){
- imagedestroy($water_img);
- }
-
- if(isset($dest_img)){
- imagedestroy($dest_img);
- }
-
- }
- }
- }
- }
-
-
- /** 判断处理程序是否已安装
- * @return boolean
- */
- private function check_handler(){
-
- $handler = $this->_handler;
-
- if(!in_array($handler, array('imagemagick', 'gd', null))){
- return false;
- }
-
- // 检查是否有安装imagemagick
- $imagemagick_installed = strstr(shell_exec('convert -version'),'Version: ImageMagick')!=''? true : false;
-
- // 检查是否有安装gd库
- $gd_installed = function_exists('gd_info')? true : false;
-
- switch($handler){
- case 'imagemagick':
- return $imagemagick_installed;
- break;
-
- case 'gd':
- return $gd_installed;
- break;
-
- case null:
- if($imagemagick_installed){
- $this->_handler = 'imagemagick';
- return true;
- }
-
- if($gd_installed){
- $this->_handler = 'gd';
- return true;
- }
- break;
- }
-
- return false;
- }
-
-
- /** 创建图片目录
- * @param String $path
- * @return boolean
- */
- private function create_dirs($dest){
- if(!is_dir(dirname($dest))){
- return mkdir(dirname($dest), 0777, true);
- }
- return true;
- }
-
-
- /** 判断参数是否存在
- * @param Array $obj 数组对象
- * @param String $key 要查找的key
- * @return boolean
- */
- private function exists($obj,$key=''){
- if($key==''){
- return isset($obj) && !empty($obj);
- }else{
- $keys = explode('.',$key);
- for($i=0,$max=count($keys); $i if(isset($obj[$keys[$i]])){
- $obj = $obj[$keys[$i]];
- }else{
- return false;
- }
- }
- return isset($obj) && !empty($obj);
- }
- }
-
-
- /** 记录log
- * @param String $msg 要记录的log讯息
- */
- private function to_log($msg){
- if($this->_log){
- $msg = '['.date('Y-m-d H:i:s').']'.$msg."\r\n";
- file_put_contents($this->_log, $msg, FILE_APPEND);
- }
- }
-
-
- /** hex颜色转rgb颜色
- * @param String $color hex颜色
- * @return Array
- */
- private function hex2rgb($hexcolor){
- $color = str_replace('#', '', $hexcolor);
- if (strlen($color) > 3) {
- $rgb = array(
- 'r' => hexdec(substr($color, 0, 2)),
- 'g' => hexdec(substr($color, 2, 2)),
- 'b' => hexdec(substr($color, 4, 2))
- );
- } else {
- $r = substr($color, 0, 1) . substr($color, 0, 1);
- $g = substr($color, 1, 1) . substr($color, 1, 1);
- $b = substr($color, 2, 1) . substr($color, 2, 1);
- $rgb = array(
- 'r' => hexdec($r),
- 'g' => hexdec($g),
- 'b' => hexdec($b)
- );
- }
- return $rgb;
- }
-
-
- /** 获取图片类型
- * @param String $file 图片路径
- * @return int
- */
- private function get_file_ext($file){
- $filename = basename($file);
- list($name, $ext)= explode('.', $filename);
-
- $ext_type = 0;
-
- switch(strtolower($ext)){
- case 'jpg':
- case 'jpeg':
- $ext_type = 2;
- break;
- case 'gif':
- $ext_type = 1;
- break;
- case 'png':
- $ext_type = 3;
- break;
- }
-
- return $ext_type;
- }
-
- } // class end
-
- ?>
- demo:
- [php] view plaincopy
-
define('ROOT', dirname(__FILE__));
-
- require(ROOT."/PicThumb.class.php");
-
- $logfile = ROOT.'/PicThumb.log';
- $source1 = ROOT.'/pic/source.jpg';
- $dest1 = ROOT.'/pic/1.jpg';
- $dest2 = ROOT.'/pic/2.gif';
- $dest3 = ROOT.'/pic/3.png';
-
- $source2 = ROOT.'/pic/source_cmyk.jpg';
- $dest4 = ROOT.'/pic/4.jpg';
- $dest5 = ROOT.'/pic/5.gif';
- $dest6 = ROOT.'/pic/6.png';
-
- $watermark = ROOT.'/pic/watermark.png';
-
- // 按比例生成缩略图
- $param = array(
- 'type' => 'fit',
- 'width' => 100,
- 'height' => 100,
- );
-
- $obj = new PicThumb($logfile);
- $obj->set_config($param);
- $flag = $obj->create_thumb($source1, $dest1);
-
- if($flag){ // bbs.it-home.org
- echo '';
- }else{
- echo 'create thumb fail';
- }
-
- // 按比例生成缩略图,不足部分用#FF0000填充
- $param = array(
- 'type' => 'fit',
- 'width' => 100,
- 'height' => 100,
- 'bgcolor' => '#FFFF00'
- );
-
- $obj = new PicThumb($logfile);
- $obj->set_config($param);
- $flag = $obj->create_thumb($source1, $dest2);
-
- if($flag){
- echo '';
- }else{
- echo 'create thumb fail';
- }
-
- // 裁剪250x250的缩略图,裁剪位置是底部中间,水印位置西南,透明度50
- $param = array(
- 'type' => 'crop',
- 'croppos' => 'BM',
- 'width' => 250,
- 'height' => 250,
- 'watermark' => $watermark,
- 'opacity' => 50,
- 'gravity' => 'SouthWest'
- );
-
- $obj = new PicThumb($logfile);
- $obj->set_config($param);
- $flag = $obj->create_thumb($source1, $dest3);
-
- if($flag){
- echo '';
- }else{
- echo 'create thumb fail';
- }
-
- // 按比例生成缩略图 CMYK格式
- $param = array(
- 'type' => 'fit',
- 'width' => 100,
- 'height' => 100,
- );
-
- $obj = new PicThumb($logfile);
- $obj->set_config($param);
- $flag = $obj->create_thumb($source2, $dest4);
-
- if($flag){
- echo '';
- }else{
- echo 'create thumb fail';
- }
// 按比例生成缩略图,不足部分用#FF0000填充 CMYK格式
- $param = array(
- 'type' => 'fit',
- 'width' => 100,
- 'height' => 100,
- 'bgcolor' => '#FFFF00'
- );
-
- $obj = new PicThumb($logfile);
- $obj->set_config($param);
- $flag = $obj->create_thumb($source2, $dest5);
-
- if($flag){
- echo '';
- }else{
- echo 'create thumb fail';
- }
-
- // 裁剪250x250的缩略图,裁剪位置是底部中间,水印位置西南,透明度50 CMYK格式
- $param = array(
- 'type' => 'crop',
- 'croppos' => 'BM',
- 'width' => 250,
- 'height' => 250,
- 'watermark' => $watermark,
- 'opacity' => 50,
- 'gravity' => 'SouthWest'
- );
-
- $obj = new PicThumb($logfile);
- $obj->set_config($param);
- $flag = $obj->create_thumb($source2, $dest6);
-
- if($flag){
- echo '';
- }else{
- echo 'create thumb fail';
- }
- ?>
-
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>>> php缩略图生成类源码下载地址
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