首页
所有分类
TAGS
文字工具 EMOJI BIBLE
编程 PHP

浅谈php扩展imagick

Posted in PHP onJune 02, 2014

PHP建图通常都用GD库,因为是内置的不需要在服务器上额外安装插件,所以用起来比较省心,但是如果你的程序主要的功能就是处理图像,那?就不建议用GD了,因为GD不但低效能而且能力也比较弱,?子玫南低匙试匆财亩?另外GD的creatfrom也有bug,而imagick却是一个很好的替代品,为此最近把我的一个项目由GD改成了imagick,但是改完之后出现了一些状况在此分享给大家.

首先说一下我这边出现的状况:

状况一:需要重写图像操作class

状况二:imagick多线程时会导致cpu使用率暴增到100%

在此顺便提一下imagick在centos6.4的安装方法:

1、安装ImageMagick

wget http://soft.vpser.net/web/imagemagick/ImageMagick-6.7.1-2.tar.gz
tar zxvf ImageMagick-6.7.1-2.tar.gz
cd ImageMagick-6.7.1-2/
./configure --prefix=/usr/local/imagemagick --disable-openmp
make && make install
ldconfig

测试ImageMagick是否可以正常运行：

/usr/local/imagemagick/bin/convert -version

2、安装PHP扩展：imagick

wget http://pecl.php.net/get/imagick-3.0.1.tgz
tar zxvf imagick-3.0.1.tgz
cd imagick-3.0.1/
/usr/local/php/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config --with-imagick=/usr/local/imagemagick
make && make install
ldconfig
vi /usr/local/php/etc/php.ini
添加：extension = "imagick.so"

重启lnmp

/root/lnmp reload

接下来我们针对上述两个状况分别提出解决办法:

状况一的解决办法如下:

/**
    Imagick图像处理类
    用法:
        //引入Imagick物件
        if(!defined('CLASS_IMAGICK')){require(Inc.'class_imagick.php');}
        $Imagick=new class_imagick();
        $Imagick->open('a.gif');
        $Imagick->resize_to(100,100,'scale_fill');
        $Imagick->add_text('1024i.com',10,20);
        $Imagick->add_watermark('1024i.gif',10,50);
        $Imagick->save_to('x.gif');
        unset($Imagick);
/**/
define('CLASS_IMAGICK',TRUE);
class class_imagick{
    private $image=null;
    private $type=null;
    // 构造
    public function __construct(){}
    // 析构
    public function __destruct(){
        if($this->image!==null){$this->image->destroy();}
    }
    // 载入图像
    public function open($path){
        if(!file_exists($path)){
            $this->image=null;
            return ;
        }
        $this->image=new Imagick($path);
        if($this->image){
            $this->type=strtolower($this->image->getImageFormat());
        }
        $this->image->stripImage();
        return $this->image;
    }
    /**
        图像裁切
    /**/
    public function crop($x=0,$y=0,$width=null,$height=null){
        if($width==null) $width=$this->image->getImageWidth()-$x;
        if($height==null) $height=$this->image->getImageHeight()-$y;
        if($width<=0 || $height<=0) return;
        if($this->type=='gif'){
            $image=$this->image;
            $canvas=new Imagick();
            $images=$image->coalesceImages();
            foreach($images as $frame){
                $img=new Imagick();
                $img->readImageBlob($frame);
                $img->cropImage($width,$height,$x,$y);
                $canvas->addImage($img);
                $canvas->setImageDelay($img->getImageDelay());
                $canvas->setImagePage($width,$height,0,0);
            }
            $image->destroy();
            $this->image=$canvas;
        }else{
            $this->image->cropImage($width,$height,$x,$y);
        }
    }
    /**
        更改图像大小
        参数:
            $width:新的宽度
            $height:新的高度
            $fit: 适应大小
                'force': 把图像强制改为$width X $height
                'scale': 按比例在$width X $height内缩放图片,结果不完全等於$width X $height
                'scale_fill':按比例在$width X $height内缩放图片,没有像素的地方填充?色$fill_color=array(255,255,255)(红,绿,蓝,透明度[0不透明-127全透明])
                其他:智能模式,缩放图片并从正中裁切$width X $height的大小
        注意:
            $fit='force','scale','scale_fill'时输出完整图像
            $fit=图像方位时输出指定位置部份的图像
        字母与图像的对应关系如下:
            north_west   north   north_east
            west         center        east
            south_west   south   south_east
    /**/
    public function resize_to($width=100,$height=100,$fit='center',$fill_color=array(255,255,255,0)){
        switch($fit){
        case 'force':
            if($this->type=='gif'){
                $image=$this->image;
                $canvas=new Imagick();
                $images=$image->coalesceImages();
                foreach($images as $frame){
                    $img=new Imagick();
                    $img->readImageBlob($frame);
                    $img->thumbnailImage($width,$height,false);
                    $canvas->addImage($img);
                    $canvas->setImageDelay($img->getImageDelay());
                }
                $image->destroy();
                $this->image=$canvas;
            }else{
                $this->image->thumbnailImage($width,$height,false);
            }
            break;
        case 'scale':
            if($this->type=='gif'){
                $image=$this->image;
                $images=$image->coalesceImages();
                $canvas=new Imagick();
                foreach($images as $frame){
                    $img=new Imagick();
                    $img->readImageBlob($frame);
                    $img->thumbnailImage($width,$height,true);
                    $canvas->addImage($img);
                    $canvas->setImageDelay($img->getImageDelay());
                }
                $image->destroy();
                $this->image=$canvas;
            }else{
                $this->image->thumbnailImage($width,$height,true);
            }
            break;
        case 'scale_fill':
            $size=$this->image->getImagePage();
            $src_width=$size['width'];
            $src_height=$size['height'];
            $x=0;
            $y=0;
            $dst_width=$width;
            $dst_height=$height;
            if($src_width*$height > $src_height*$width){
                $dst_height=intval($width*$src_height/$src_width);
                $y=intval(($height-$dst_height)/2);
            }else{
                $dst_width=intval($height*$src_width/$src_height);
                $x=intval(($width-$dst_width)/2);
            }
            $image=$this->image;
            $canvas=new Imagick();
            $color='rgba('.$fill_color[0].','.$fill_color[1].','.$fill_color[2].','.$fill_color[3].')';
            if($this->type=='gif'){
                $images=$image->coalesceImages();
                foreach($images as $frame){
                    $frame->thumbnailImage($width,$height,true);
                    $draw=new ImagickDraw();
                    $draw->composite($frame->getImageCompose(),$x,$y,$dst_width,$dst_height,$frame);
                    $img=new Imagick();
                    $img->newImage($width,$height,$color,'gif');
                    $img->drawImage($draw);
                    $canvas->addImage($img);
                    $canvas->setImageDelay($img->getImageDelay());
                    $canvas->setImagePage($width,$height,0,0);
                }
            }else{
                $image->thumbnailImage($width,$height,true);
                $draw=new ImagickDraw();
                $draw->composite($image->getImageCompose(),$x,$y,$dst_width,$dst_height,$image);
                $canvas->newImage($width,$height,$color,$this->get_type());
                $canvas->drawImage($draw);
                $canvas->setImagePage($width,$height,0,0);
            }
            $image->destroy();
            $this->image=$canvas;
            break;
        default:
            $size=$this->image->getImagePage();
            $src_width=$size['width'];
            $src_height=$size['height'];
            $crop_x=0;
            $crop_y=0;
            $crop_w=$src_width;
            $crop_h=$src_height;
            if($src_width*$height > $src_height*$width){
                $crop_w=intval($src_height*$width/$height);
            }else{
                $crop_h=intval($src_width*$height/$width);
            }
            switch($fit){
                case 'north_west':
                    $crop_x=0;
                    $crop_y=0;
                    break;
                case 'north':
                    $crop_x=intval(($src_width-$crop_w)/2);
                    $crop_y=0;
                    break;
                case 'north_east':
                    $crop_x=$src_width-$crop_w;
                    $crop_y=0;
                    break;
                case 'west':
                    $crop_x=0;
                    $crop_y=intval(($src_height-$crop_h)/2);
                    break;
                case 'center':
                    $crop_x=intval(($src_width-$crop_w)/2);
                    $crop_y=intval(($src_height-$crop_h)/2);
                    break;
                case 'east':
                    $crop_x=$src_width-$crop_w;
                    $crop_y=intval(($src_height-$crop_h)/2);
                    break;
                case 'south_west':
                    $crop_x=0;
                    $crop_y=$src_height-$crop_h;
                    break;
                case 'south':
                    $crop_x=intval(($src_width-$crop_w)/2);
                    $crop_y=$src_height-$crop_h;
                    break;
                case 'south_east':
                    $crop_x=$src_width-$crop_w;
                    $crop_y=$src_height-$crop_h;
                    break;
                default:
                    $crop_x=intval(($src_width-$crop_w)/2);
                    $crop_y=intval(($src_height-$crop_h)/2);
            }
            $image=$this->image;
            $canvas=new Imagick();
            if($this->type=='gif'){
                $images=$image->coalesceImages();
                foreach($images as $frame){
                    $img=new Imagick();
                    $img->readImageBlob($frame);
                    $img->cropImage($crop_w,$crop_h,$crop_x,$crop_y);
                    $img->thumbnailImage($width,$height,true);
                    $canvas->addImage($img);
                    $canvas->setImageDelay($img->getImageDelay());
                    $canvas->setImagePage($width,$height,0,0);
                }
            }else{
                $image->cropImage($crop_w,$crop_h,$crop_x,$crop_y);
                $image->thumbnailImage($width,$height,true);
                $canvas->addImage($image);
                $canvas->setImagePage($width,$height,0,0);
            }
            $image->destroy();
            $this->image=$canvas;
        }
    }
    /**
        添加图片水印
        参数:
            $path:水印图片(包含完整路径)
            $x,$y:水印座标
    /**/
    public function add_watermark($path,$x=0,$y=0){
        $watermark=new Imagick($path);
        $draw=new ImagickDraw();
        $draw->composite($watermark->getImageCompose(),$x,$y,$watermark->getImageWidth(),$watermark->getimageheight(),$watermark);
        if($this->type=='gif'){
            $image=$this->image;
            $canvas=new Imagick();
            $images=$image->coalesceImages();
            foreach($image as $frame){
                $img=new Imagick();
                $img->readImageBlob($frame);
                $img->drawImage($draw);
                $canvas->addImage($img);
                $canvas->setImageDelay($img->getImageDelay());
            }
            $image->destroy();
            $this->image=$canvas;
        }else{
            $this->image->drawImage($draw);
        }
    }
    /**
        添加文字水印
        参数:
            $text:水印文字
            $x,$y:水印座标
    /**/
    public function add_text($text,$x=0,$y=0,$angle=0,$style=array()){
        $draw=new ImagickDraw();
        if(isset($style['font'])) $draw->setFont($style['font']);
        if(isset($style['font_size'])) $draw->setFontSize($style['font_size']);
        if(isset($style['fill_color'])) $draw->setFillColor($style['fill_color']);
        if(isset($style['under_color'])) $draw->setTextUnderColor($style['under_color']);
        if($this->type=='gif'){
            foreach($this->image as $frame){
                $frame->annotateImage($draw,$x,$y,$angle,$text);
            }
        }else{
            $this->image->annotateImage($draw,$x,$y,$angle,$text);
        }
    }
    /**
        图片存档
        参数:
            $path:存档的位置和新的档案名
    /**/
    public function save_to($path){
        $this->image->stripImage();
        switch($this->type){
        case 'gif':
            $this->image->writeImages($path,true);
            return ;
        case 'jpg':
        case 'jpeg':
            $this->image->setImageCompressionQuality($_ENV['ImgQ']);
            $this->image->writeImage($path);
            return ;
        case 'png':
            $flag = $this->image->getImageAlphaChannel();
            // 如果png背景不透明则压缩
            if(imagick::ALPHACHANNEL_UNDEFINED == $flag or imagick::ALPHACHANNEL_DEACTIVATE == $flag){
                $this->image->setImageType(imagick::IMGTYPE_PALETTE);
                $this->image->writeImage($path);
            }else{
                $this->image->writeImage($path);
            }unset($flag);
            return ;
        default:
            $this->image->writeImage($path);
            return ;
        }
    }
    // 直接输出图像到萤幕
    public function output($header=true){
        if($header) header('Content-type: '.$this->type);
        echo $this->image->getImagesBlob();
    }
    /**
        建立缩小图
        $fit为真时,将保持比例并在$width X $height内?生缩小图
    /**/
    public function thumbnail($width=100,$height=100,$fit=true){$this->image->thumbnailImage($width,$height,$fit);}
    /**
        给图像添加边框
        $width: 左右边框宽度
        $height: 上下边框宽度
        $color: ?色
    /**/
    public function border($width,$height,$color='rgb(220,220,220)'){
        $color=new ImagickPixel();
        $color->setColor($color);
        $this->image->borderImage($color,$width,$height);
    }
    //取得图像宽度
    public function get_width(){$size=$this->image->getImagePage();return $size['width'];}
    //取得图像高度
    public function get_height(){$size=$this->image->getImagePage();return $size['height'];}
    // 设置图像类型
    public function set_type($type='png'){$this->type=$type;$this->image->setImageFormat($type);}
    // 取得图像类型
    public function get_type(){return $this->type;}
    public function blur($radius,$sigma){$this->image->blurImage($radius,$sigma);} // 模糊
    public function gaussian_blur($radius,$sigma){$this->image->gaussianBlurImage($radius,$sigma);} // 高斯模糊
    public function motion_blur($radius,$sigma,$angle){$this->image->motionBlurImage($radius,$sigma,$angle);} // 运动模糊
    public function radial_blur($radius){$this->image->radialBlurImage($radius);} // 径向模糊
    public function add_noise($type=null){$this->image->addNoiseImage($type==null?imagick::NOISE_IMPULSE:$type);} // 添加噪点
    public function level($black_point,$gamma,$white_point){$this->image->levelImage($black_point,$gamma,$white_point);} // 调整色阶
    public function modulate($brightness,$saturation,$hue){$this->image->modulateImage($brightness,$saturation,$hue);} // 调整亮度,饱和度,色调
    public function charcoal($radius,$sigma){$this->image->charcoalImage($radius,$sigma);} // 素描效果
    public function oil_paint($radius){$this->image->oilPaintImage($radius);} // 油画效果
    public function flop(){$this->image->flopImage();} // 水平翻转
    public function flip(){$this->image->flipImage();} // 垂直翻转
}

状况二的解决办法如下:

首先用/usr/local/imagemagick/bin/convert -version指令查看一下输出内容是否已经开?⒘硕嘞叱?Features:的值为空说明是单线程,如果Features:的值是openMP说明是多线程.imagick的多线程模式有一个bug,他会导致多核心的cpu使用率瞬间?升到100所以一定要使用它的单线程模式才行.

Version: ImageMagick 6.7.1-2 2014-05-29 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2011 ImageMagick Studio LLC
Features:  

 上边是我配置正确时显示的结果,如果没有配置正确会显示下边的结果

Version: ImageMagick 6.7.1-2 2014-05-29 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2011 ImageMagick Studio LLC
Features: openMP

 第一种结果是单线程模式,第二种结果是多线程模式,因为imagick的多线程模式有bug,所以如果您刚开始是用多线程模式安装的imagick那就必须要yum remove imagemagick将其卸载掉重新安装才行.

经过重写class,重装imagick之后一切正常,而且处理图像的效能比之以前有了大幅提升

 

浅谈php扩展imagick

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

PHP 相关文章推荐
php下防止单引号,双引号在接受页面转义的设置方法
Sep 25 PHP
PHP生成带有雪花背景的验证码
Sep 28 PHP
PHP中usort在值相同时改变原始位置问题的解决方法
Nov 27 PHP
如何使用Strace调试工具
Jun 03 PHP
使用php显示搜索引擎来的关键词
Feb 13 PHP
php从数组中随机选择若干不重复元素的方法
Mar 14 PHP
php计算一个文件大小的方法
Mar 30 PHP
php检查字符串中是否有外链的方法
Jul 29 PHP
php实现微信扫码自动登陆与注册功能
Sep 22 PHP
ThinkPHP开发--使用七牛云储存
Sep 14 PHP
PHP支付宝当面付2.0代码
Dec 21 PHP
php简单计算权重的方法示例【适合抽奖类应用】
Jun 10 PHP
PHP小技巧之函数重载
Jun 02 #PHP
mac下Apache + MySql + PHP搭建网站开发环境
Jun 02 #PHP
在PHP中使用X-SendFile头让文件下载更快
Jun 01 #PHP
PHP is_subclass_of函数的一个BUG和解决方法
Jun 01 #PHP
PHP中数组的分组排序实例
Jun 01 #PHP
php_screw安装使用教程（另一个PHP代码加密实现）
May 29 #PHP
PHP Curl出现403错误的解决办法
May 29 #PHP
Postman(1) scrapy(1) localStorage(1) DeOldify(1) 加载异常(1) 横向滚动(1) 反射(1) virtualenv(1) BottomSheetDialog(1) 注解(1)
You might like
PHP SPL标准库之接口(Interface)详解
2015/05/11 PHP
php递归函数三种实现方法及如何实现数字累加
2015/08/07 PHP
PHP实现根据图片色界在不同位置加水印的方法
2015/08/08 PHP
用JS实现一个页面多个css样式实现
2008/05/29 Javascript
基于Jquery的实现回车键Enter切换焦点
2010/09/14 Javascript
在表单提交前进行验证的几种方式整理
2013/07/31 Javascript
JavaScript获取当前网页最后修改时间的方法
2015/04/03 Javascript
JavaScript代码生成PDF文件的方法
2016/02/26 Javascript
纯JS代码实现隔行变色鼠标移入高亮
2016/11/23 Javascript
基于JavaScript实现右键菜单和拖拽功能
2016/11/28 Javascript
js实现鼠标左右移动，图片也跟着移动效果
2017/01/25 Javascript
angularjs点击图片放大实现上传图片预览
2017/02/24 Javascript
基于Bootstrap框架实现图片切换
2017/03/10 Javascript
jQuery+CSS实现的table表格行列转置功能示例
2018/01/08 jQuery
一步步教你利用Docker设置Node.js
2018/11/20 Javascript
jquery无缝图片轮播组件封装
2020/11/25 jQuery
解决 viewer.js 动态更新图片导致无法预览的问题
2019/05/14 Javascript
layui.use模块外部使用其内部定义的js封装函数方法
2019/09/16 Javascript
Nodejs监控事件循环异常示例详解
2019/09/22 NodeJs
React+Redux实现简单的待办事项列表ToDoList
2019/09/29 Javascript
[02:23]DOTA2英雄基础教程 幻影长矛手
2013/12/09 DOTA
Python列表计数及插入实例
2014/12/17 Python
玩转python爬虫之爬取糗事百科段子
2016/02/17 Python
python机器学习库常用汇总
2017/11/15 Python
Python实现邮件的批量发送的示例代码
2018/01/23 Python
Python单向链表和双向链表原理与用法实例详解
2018/08/31 Python
详解Python requests 超时和重试的方法
2018/12/18 Python
python中matplotlib条件背景颜色的实现
2019/09/02 Python
使用Keras构造简单的CNN网络实例
2020/06/29 Python
翻译专业应届生求职信
2013/11/23 职场文书
销售人员职业生涯规划范文
2014/03/01 职场文书
青年文明号服务承诺
2014/03/31 职场文书
平安工地建设方案
2014/05/06 职场文书
红色故事汇观后感
2015/06/18 职场文书
校友会致辞
2015/07/30 职场文书
使用Oracle跟踪文件的问题详解
2021/06/28 Oracle