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Contents
module Pageflow
module LinkmapPage
module PaperclipProcessors
class ColorMask < Paperclip::Processor
CONVERT_COMMAND = [
# Create mask by making all non-matching colors in color map
# image transparent
':color_map',
'+transparent :color',
# Make all areas transparent in source that are transparent in mask
':source',
'-compose src-in -composite',
# Write result to output file
':dest'
].join(' ').freeze
def make
with_destination_tempfile do |dest|
with_color_map do |color_map_path|
convert(CONVERT_COMMAND,
color: "##{options[:style]}",
color_map: color_map_path,
source: File.expand_path(file.path),
dest: File.expand_path(dest.path))
end
end
end
private
def with_destination_tempfile
current_format = File.extname(file.path)
basename = File.basename(file.path, current_format)
dest = Tempfile.new([basename, '.png'])
dest.binmode
yield dest
dest
end
def with_color_map(&block)
Pageflow::LinkmapPage::PaperclipTempfile.for(color_map_attachment, &block)
end
def color_map_attachment
options.fetch(:color_map_attachment)
end
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems