Non-blocking transformation and image writing in Ruby, powered by VIPS
- OS X or Linux
- MRI >= 1.9.2
- libvips 7.28.x
- libexif
- On Ubuntu,
apt-get install libvips-dev, or follow the guidelines at: https://github.com/jcupitt/libvips
If you installed it from source, make sure:
- /usr/local/lib is on your LD_LIBRARY_PATH
- /usr/local/bin is on PATH
- /usr/local/lib/pkgconfig is on PKG_CONFIG_PATH
- bundle install # to install dependencies
- rake gemspec # to generate gemspec file
- rake build # to build the gem
- rake install # to install the gem
require 'rubygems'
require 'async_vips'
include AsyncVips
# Non-blocking scaling of an image:
# Allowed symbols are: :load, :scale_x, :scale_y, :save
# Wneh called, a function is invoked on a separate native thread.
# The callback-proc is invoked on a separate Ruby thread on completion.
AsyncVips.transform(:load => srcfile, :scale_x => 800, :save => dstfile) do |img|
if(img.error != nil)
puts img.error
end
end
# Set the number of operations cached by VIPS:
AsyncVips.set_cache(100)
# Get image information:
# Allowed symbols are: :load
AsyncVips.info(:load => srcfile) do |img|
puts img.src # image filepath
puts img.width # image width
puts img.height # image height
puts img.size # image size in bytes
end
## Using event machine
require 'rubygems'
require 'async_vips'
require 'eventmachine'
include AsyncVips
#puts AsyncVips::VERSION
#puts AsyncVips::LIB_VERSION
AsyncVips.set_cache(0) # sets the number of operations cached by VIPS
EM.run do
EM.add_timer(3) do
source = './images/*.JPG'
files = Dir[source]
files.each do |srcfile|
dstfile = './output/'+File.basename(srcfile)
AsyncVips.transform(:load => srcfile, :scale_x => 800, :save => dstfile) do |img|
puts img.src
if(img.error != nil)
puts img.error
end
end
end
end
EM.add_periodic_timer(1) do
puts "#{Time.now}"
end
end
[Grigoriy Chudnov] (mailto:g.chudnov@gmail.com)
Distributed under the The MIT License (MIT).