node 图片合成

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本篇关于两个工具模块images、gm的介绍与问题处理

一、本地最简单的方式 - images模块

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const images = require('images')

images(distPath)
    .draw(images(tag), 0, 0)
    .save(distPath);

坑

mac 上运行正常，centos上需要自己编译各种不同的文件。

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Error: Can't load the addon. Issue to: https://github.com/zhangyuanwei/node-images/issues Error: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by /data/webroot/www/wx_edit/node_modules/images/bindings/linux/x64/6.0.0/binding.node)

具体见 https://github.com/zhangyuanwei/node-images/issues/45

结论

操作太复杂成本太高

二、gm模块

推荐使用

https://github.com/aheckmann/gm

调用的相关其他工具，GraphicsMagick、ImageMagick

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function comImage(distPath, tag) {
    return new Promise((resolve, reject) => {
        gm(distPath)
        .command('composite')
        .in('-gravity', 'NorthWest')
        .in(tag)
        .write(distPath, function(err) {
            if (!err) {
                resolve(distPath);
            } else {
                reject(err);
            }
        });
    });
}

坑

mac 上运行正常，centos上通过yum install imagemagick、yum install graphicsmagick没法玩。

需要执行安装工具，见

  1. How to install GraphicsMagick on CentOS 6.4
  2. Install Graphics Magick on CentOS 7
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#!/bin/bash

# Install build dependencies
yum install -y gcc libpng libjpeg libpng-devel libjpeg-devel ghostscript libtiff libtiff-devel freetype freetype-devel

# Get GraphicsMagick source
wget ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/1.3/GraphicsMagick-1.3.9.tar.gz
tar zxvf GraphicsMagick-1.3.9.tar.gz

# Configure and compile
cd GraphicsMagick-1.3.9
./configure --enable-shared
make
make install

# Ensure everything was installed correctly
gm version

# If you are going to use this with PHP you can also instal the pecl extension
pecl install gmagick-1.0.8b2

继续坑 - 如果报错

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gm: error while loading shared libraries: libGraphicsMagick.so.3: cannot open shared object file: No such file or directory

解决方式

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echo "/usr/local/lib" >> /etc/ld.so.conf
ldconfig

  1. GraphicsMagick
  2. How to install GraphicsMagick with GMagick PHP extension

最终建议

centOS上的依赖安装，让专业的运维操作解决