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Bitmap/Read an image through a pipe: Difference between revisions
Bitmap/Read an image through a pipe (view source)
Revision as of 12:08, 4 September 2009
, 14 years agoadd Ruby
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(add Ruby) |
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Line 50:
(img)
;;</lang>
=={{header|Ruby}}==
Extending [[Read ppm file#Ruby]] and [[PPM conversion through a pipe#Ruby]]. Uses the ImageMagick <code>convert</code> tool.
<lang ruby>class Pixmap
def self.read_ppm(ios)
format = ios.gets.chomp
width, height = ios.gets.chomp.split.map {|n| n.to_i }
max_colour = ios.gets.chomp
if (not PIXMAP_FORMATS.include?(format)) or
width < 1 or height < 1 or
max_colour != '255'
then
ios.close
raise StandardError, "file '#{filename}' does not start with the expected header"
end
ios.binmode if PIXMAP_BINARY_FORMATS.include?(format)
bitmap = self.new(width, height)
height.times do |y|
width.times do |x|
# read 3 bytes
red, green, blue = case format
when 'P3' then ios.gets.chomp.split
when 'P6' then ios.read(3).unpack('C3')
end
bitmap[x,y] = RGBColour.new(red, green, blue)
end
end
ios.close
bitmap
end
def self.open(filename)
read_ppm(File.open(filename, 'r'))
end
def self.open_from_jpeg(filename)
read_ppm(IO.popen("convert jpg:#{filename} ppm:-", 'r'))
end
end
bitmap = Pixmap.open_from_jpeg('file.jpg')</lang>
=={{header|Tcl}}==
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