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# module : graphics/inkscape
# copyright : PRAGMA Advanced Document Engineering
# version : 2002-2005
# author : Hans Hagen
#
# project : ConTeXt / eXaMpLe
# concept : Hans Hagen
# info : j.hagen@xs4all.nl
# www : www.pragma-ade.com
# ['base/variables','variables'].each do |r| begin require r ; rescue Exception ; else break ; end ; end
require 'base/variables'
class ImageMagick
include Variables
def initialize(logger=nil)
unless logger then
puts('magick class needs a logger')
exit
end
@variables = Hash.new
@logger = logger
reset
end
def reset
['compression','depth','colorspace','quality'].each do |key|
setvariable(key)
end
end
def supported?(filename) # ? pdf
filename =~ /.*\.(png|gif|tif|tiff|jpg|jpeg|eps|ai\d*)/io
end
def convert(suffix='pdf')
inpfilename = getvariable('inputfile').dup
outfilename = getvariable('outputfile').dup
outfilename = inpfilename.dup if outfilename.empty?
outfilename.gsub!(/(\.[^\.]*?)$/, ".#{suffix}")
if inpfilename.empty? || outfilename.empty? then
report("no filenames given")
return false
end
if inpfilename == outfilename then
report("filenames must differ (#{inpfilename} #{outfilename})")
return false
end
unless FileTest.file?(inpfilename) then
report("unknown file #{inpfilename}")
return false
end
if inpfilename =~ /\.tif+$/io then
tmpfilename = 'temp.png'
arguments = "#{inpfilename} #{tmpfilename}"
begin
debug("imagemagick: #{arguments}")
ok = System.run('imagemagick',arguments)
rescue
report("aborted due to error")
return false
else
return false unless ok
end
inpfilename = tmpfilename
end
compression = depth = colorspace = quality = ''
if getvariable('compression') =~ /(zip|jpeg)/o then
compression = " -compress #{$1}"
end
if getvariable('depth') =~ /(8|16)/o then
depth = "-depth #{$1}"
end
if getvariable('colorspace') =~ /(gray|rgb|cmyk)/o then
colorspace = "-colorspace #{$1}"
end
case getvariable('quality')
when 'low' then quality = '-quality 0'
when 'medium' then quality = '-quality 75'
when 'high' then quality = '-quality 100'
end
report("converting #{inpfilename} to #{outfilename}")
arguments = [compression,depth,colorspace,quality,inpfilename,outfilename].join(' ').gsub(/\s+/,' ')
begin
debug("imagemagick: #{arguments}")
ok = System.run('imagemagick',arguments)
rescue
report("aborted due to error")
return false
else
return ok
end
end
def autoconvert
inpfilename = getvariable('inputfile')
outfilename = getvariable('outputfile')
if inpfilename.empty? || ! FileTest.file?(inpfilename) then
report("missing file #{inpfilename}")
return
end
outfilename = inpfilename.dup if outfilename.empty?
tmpfilename = 'temp.jpg'
reset
megabyte = 1024*1024
ok = false
if FileTest.size(inpfilename)>2*megabyte
setvariable('compression','zip')
ok = convert
else
setvariable('compression','jpeg')
if FileTest.size(inpfilename)>10*megabyte then
setvariable('quality',85)
elsif FileTest.size(inpfilename)>5*megabyte then
setvariable('quality',90)
else
setvariable('quality',95)
end
report("auto quality #{getvariable('quality')}")
setvariable('outputfile', tmpfilename)
ok = convert('jpg')
setvariable('inputfile', tmpfilename)
setvariable('outputfile', outfilename)
ok = convert
begin
File.delete(tmpfilename)
rescue
report("#{tmpfilename} cannot be deleted")
end
end
reset
return ok
end
end
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