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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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require 'fileutils'
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require 'mimemagic'
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begin
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require 'fastimage/resize' unless defined? FastImage
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rescue LoadError
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# :thumbnails group not available
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end
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module Redmine
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module Thumbnail
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extend Redmine::Utils::Shell
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CONVERT_BIN = (Redmine::Configuration['imagemagick_convert_command'] || 'convert').freeze
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# Generates a thumbnail for the source image to target
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def self.generate(source, target, size)
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# Nothing we can do without the libraries
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return nil unless convert_available?
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unless File.exists?(target)
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# Make sure we only invoke Imagemagick if this is actually an image
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unless File.open(source) {|f| MimeMagic.by_magic(f).try(:image?)}
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return nil
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end
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directory = File.dirname(target)
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unless File.exists?(directory)
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FileUtils.mkdir_p directory
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end
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size_option = "#{size}x#{size}>"
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cmd = "#{shell_quote CONVERT_BIN} #{shell_quote source} -thumbnail #{shell_quote size_option} #{shell_quote target}"
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unless system(cmd)
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logger.error("Creating thumbnail failed (#{$?}):\nCommand: #{cmd}")
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return nil
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end
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# Nothing to do, thumb was already created
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return target if File.exists?(target)
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fastimage = FastImage.new(source)
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# Cannot read dimensions for source - it's probably not an image
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return nil if fastimage.size.nil?
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directory = File.dirname(target)
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FileUtils.mkdir_p(directory) unless File.exists?(directory)
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if fastimage.size.max <= size
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FileUtils.cp(source, target)
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elsif fastimage.size.first > fastimage.size.last
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fastimage.resize(size, 0, :outfile => target, :jpeg_quality => 90)
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else
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fastimage.resize(0, size, :outfile => target, :jpeg_quality => 90)
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end
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target
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rescue FastImage::FastImageException
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logger.error("Creating thumbnail failed - #{$!.class.name}: #{$!.message}")
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nil
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end
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def self.convert_available?
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return @convert_available if defined?(@convert_available)
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@convert_available = system("#{shell_quote CONVERT_BIN} -version") rescue false
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logger.warn("Imagemagick's convert binary (#{CONVERT_BIN}) not available") unless @convert_available
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@convert_available
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!!defined?(FastImage)
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end
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def self.logger
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