PHP Imagick 图片合成 圆角处理

需求：为用户生成特定的二维码 ，拉取用户的微信头像 和特定的背景图合成一张用户专属海报

方法：采用PHP的Imagick扩展功能对图片进行合成处理。对微信头像进行圆角处理，然后压缩图片的质量 

1. 根据微信用户特定id生成专属二维码

 public static function getTicket($scene_id)
 {
    $qrcode = '{"expire_seconds": 2592000, "action_name": "QR_SCENE", "action_info": {"scene": {"scene_id": $scene_id }}}';  //二维码信息
    $access_token = self::getToken();   //公众号token，这个要获取自己公众号的
    $getticket_url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?			   access_token=$access_token";
    $ticketinfo = self::request_by_curl($getticket_url,$qrcode);
    return $ticketinfo['ticket']; //专属二维码的ticken
 }

 public static function request_by_curl($remote_server, $post_string='')
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $remote_server);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_string);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);	
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array("Expect: "));
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
        $content = curl_exec($ch);
        curl_close($ch);
        $reArr=json_decode($content,true);
        return $reArr;
    }

2、 合成海报

public function CompositeImage ($ticket, $wxnick, $userId)
{
   $Qrcode = new Imagick("https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=$ticket"); 
   $Qrcode->setImageResolution(0.1,0.3);      //设置图片分辨率 
   $QrcodeWH = $Qrcode->getImageGeometry();   //获取源图片宽和高  
   if ($QrcodeWH['width']>200) {  
      $QrcodeW['width'] = 200;  
      $QrcodeH['height'] = $QrcodeW['width']/$QrcodeWH['width']*$QrcodeWH['height'];  
   } else {  
      $QrcodeW['width'] = $QrcodeWH['width'];  
      $QrcodeH['height'] = $QrcodeWH['height'];  
   }                                                                                     
      $Qrcode->thumbnailImage( $QrcodeW['width'], $QrcodeWH['height'], true );	//按照选定的比例进行缩放 
	
    // 预先下载微信头像，再生成合成信息 
   
      $curl   = curl_init($wxnick);
      $wxnickpath = "upload/wxnick/".$userId.".jpg";
      curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
      $imageData = curl_exec($curl);
      curl_close($curl);
      $tp = @fopen($wxnickpath, 'a');
      fwrite($tp, $imageData);
      fclose($tp);

      $weixin = new Imagick($wxnickpath); 
      $weixin->setImageResolution(0.1,0.3);	
      $weixin->roundCorners(360,360);		   //圆角处理
      $wxWH = $weixin->getImageGeometry();
      if ($wxWH['width']>200) {  
	$wxW['width'] = 200;  
	$wxH['height'] = $wxW['width']/$wxWH['width']*$wxWH['height'];  
      } else {  
	$wxW['width'] = $wxWH['width'];  
	$wxH['height'] = $wxWH['height'];  
      }  
      $weixin->thumbnailImage( $wxW['width'], $wxWH['height'], true );//等比例缩放

      //创建一个Imagick对象，同时获取要处理的背景图  /data/wenda/htdocs/upload
	$poster = new Imagick( "/data/wenda/htdocs/upload/poster.png" );  
	$posterWH  = $poster->getImageGeometry();  			 
	$posterW['width'] = $posterWH['width'];  
	$posterH['height'] = $posterWH['height']; 
	// 按照缩略图大小创建一个有颜色的图片  
	$canvas = new Imagick();  
	$canvas->newImage( $posterW['width'], $posterH['height'], 'black', 'jpg' ); 
		  
	//二维码 微信头像 背景 合成
	$poster->compositeImage($Qrcode,Imagick::COMPOSITE_OVER,275,960);
	$poster->compositeImage($weixin,Imagick::COMPOSITE_OVER,275,402);
					
	$canvas->compositeImage( $poster, imagick::COMPOSITE_OVER, 0, 0);  
	$canvas->setImageCompressionQuality(60); //压缩质量
	$canvas->writeImage( "/upload/poster/$userId.jpg" ); //生成图片 	
	return $canvas;  //返回图片流信息
    }

    header( "Content-Type: image/jpg" );    //输出图片
    $posterimg = $this->CompositeImage($Fticket, $Fwnick, $userId);
    echo $posterimg //输出图片