Fork

This is a fork of the gographics/imagick package to work with Bazel. It includes compiled object files for MacOS and Linux (CentOS/7 and Ubuntu 18.04) for ImageMagick 6.8.8-7, by downloading it and its dependencies and compiling it all from source.

These instructions assume a MacOS host.

Note that Linux systems that ultimately run the binaries linked to these object files require glibc 2.14 or later. The stable versions of glibc for Ubuntu 18.04 and CentOS/7 are 2.27 and 2.17, respectively. The installed version of glibc on a Linux system can be checked by running ldd --version.

Rebuilding ImageMagick and dependencies

This is only necessary if you want to rebuild the native libraries, for example to add new delegates (support for more image formats) or upgrading the library.

Linux (Ubuntu 18.04):

vagrant up build
rm -rf libs/include/*
rm -rf libs/linux/*
vagrant scp 'build:/home/vagrant/imagemagick-build/include/*.h' libs/include/
vagrant scp 'build:/home/vagrant/imagemagick-build/include/ImageMagick-6/*' libs/include/
vagrant scp 'build:/home/vagrant/imagemagick-build/lib/*.a' libs/linux/
sed -i '' -e 's|home/vagrant/imagemagick-build|usr/local|g' libs/include/magick/*.h
patch -p0 < pixel-wand.patch

MacOS (High Sierra):

bash download-build-imagemagick.sh
cp ~/imagemagick-build/lib/*.a libs/darwin

This is a good overview of the settings if you need to make changes to the script:

http://imagemagick.sourceforge.net/http/www/install.html

Testing that it works in development

Linux (Ubuntu 18.04)

vagrant up dev
vagrant ssh dev -c 'cd /vagrant && bazel test imagick:go_default_test'

If you make changes to the library after provisioning your vagrant VM, you will need to rsync those changes for them to be visible.

vagrant rsync dev

You will also want to run bazel clean, as inappropriate caching of C artifacts has been observed.

MacOS

bazel test imagick:go_default_test

Testing that it works in production

Linux (CentOS/7)

vagrant up dev prod
vagrant ssh dev -c 'cd /vagrant && bazel build imagick:go_default_test'
vagrant scp dev:/vagrant/bazel-bin/imagick/go_default_test_/go_default_test .
chmod a+rwX go_default_test
vagrant scp go_default_test prod:/home/vagrant/
vagrant ssh prod -c ./go_default_test

Go Imagick

Go Imagick is a Go bind to ImageMagick's MagickWand C API.

It was originally developed and tested with ImageMagick 6.8.5-4, however most official Unix or Linux distributions use older versions (6.7.7, 6.8.0, etc) so some features in Go Imagick's go1 branch are being commented out and will see the light when these ImageMagick distributions could easily be updated (from the devops PoV).

Install

Mac OS X

MacPorts

sudo port install ImageMagick

Ubuntu / Debian

sudo apt-get install libmagickwand-dev

Common

Check if pkg-config is able to find the right ImageMagick include and libs:

pkg-config --cflags --libs MagickWand

Then go get it:

go get github.com/gographics/imagick/imagick

API Doc

http://godoc.org/github.com/gographics/imagick/imagick

Examples

The examples folder is full with usage examples ported from C ones found in here: http://members.shaw.ca/el.supremo/MagickWand/

Quick and partial example

Since this is a CGO binding, Go GC does not manage memory allocated by the C API then is necessary to use Terminate() and Destroy() methods.

package main

import "github.com/gographics/imagick/imagick"

func main() {
	imagick.Initialize()
	defer imagick.Terminate()

	mw := imagick.NewMagickWand()
	defer mw.Destroy()

	...
}

License

Copyright (c) 2013, Herbert G. Fischer All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of the organization nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL HERBERT G. FISCHER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.