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class User | |
has_attached_file :photo, | |
:processors => [:watermark], | |
:styles => { | |
:medium => { | |
:geometry => "300x300>", | |
:watermark_path => "#{Rails.root}/public/images/watermark.png" | |
}, | |
:thumb => "100x100>", | |
} | |
end | |
# Rails.root /lib/paperclip_processors/watermark.rb | |
module Paperclip | |
class Watermark < Thumbnail | |
def initialize(file, options = {}, attachment = nil) | |
super | |
@watermark_path = options[:watermark_path] | |
@position = options[:position].nil? ? "SouthEast" : options[:position] | |
end | |
def make | |
src = @file | |
dst = Tempfile.new([@basename].compact.join(".")) | |
dst.binmode | |
return super unless @watermark_path | |
params = "-gravity #{@position} #{transformation_command.join(" ")} #{@watermark_path} :source :dest" | |
begin | |
success = Paperclip.run("composite", params, :source => "#{File.expand_path(src.path)}[0]", :dest => File.expand_path(dst.path)) | |
rescue PaperclipCommandLineError | |
raise PaperclipError, "There was an error processing the watermark for #{@basename}" if @whiny | |
end | |
dst | |
end | |
end | |
end |
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