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Contents
# The GraphicsMagick action, dependent on the `gm` command, is able to perform
# any number of GraphicsMagick conversions on an image passed in as an input.
# The options hash should specify the +name+ for the particular step (which is
# appended to the resulting image filename) the +command+ (eg. convert, mogrify),
# the +options+ (to the command, eg. -shadow -blur), and the +extension+ which
# will determine the resulting image type. Optionally, you may also specify
# +input+ as the name of a previous step; doing this will use the result of
# that step as the source image, otherwise each step uses the original image
# as its source.
class GraphicsMagick < CloudCrowd::Action
# Download the initial image, and run each of the specified GraphicsMagick
# commands against it, returning the aggregate output.
def process
options['steps'].inject({}) {|h, step| h[step['name']] = run_step(step); h }
end
# Run an individual step (single GraphicsMagick command) in a shell-injection
# safe way, uploading the result to the AssetStore, and returning the public
# URL as the result.
# TODO: +system+ wasn't working, figure out some other way to escape.
def run_step(step)
cmd, opts = step['command'], step['options']
in_path, out_path = input_path_for(step), output_path_for(step)
`gm #{cmd} #{opts} #{in_path} #{out_path}`
save(out_path)
end
# Where should the starting image be located?
# If you pass in an optional step, returns the path to that step's output
# as input for further processing.
def input_path_for(step)
in_step = step && step['input'] && options['steps'].detect {|s| s['name'] == step['input']}
return input_path unless in_step
return output_path_for(in_step)
end
# Where should resulting images be saved locally?
def output_path_for(step)
"#{work_directory}/#{file_name}_#{step['name']}.#{step['extension']}"
end
end
Version data entries
43 entries across 43 versions & 3 rubygems