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# Copyright 2001 by Mathieu Bouchard
# $Id: smpte.rb,v 1.1 2005-10-04 02:02:15 matju Exp $
# The standard SMPTE color test pattern.
# AS SEEN ON TV !!! (but this is a cheap plastic imitation)
def make_smpte(picture="")
row_1 = ""
row_2 = ""
row_3 = ""
row_3_c = [[0,63,105],[255,255,255],[64,0,119]]
(0...320).each {|x|
n_barre_1 = 7 - x*7/320
n_barre_2 = if n_barre_1&1==0 then 0 else 8 - n_barre_1 end
row_1 << yield (*([1,2,0].map{|c| 255 * ((n_barre_1 >> c)&1) }))
row_2 << yield (*([1,2,0].map{|c| 255 * ((n_barre_2 >> c)&1) }))
row_3 << yield (*(row_3_c[x/57] || [0,0,0]))
}
160.times { picture << row_1 }
20 .times { picture << row_2 }
60 .times { picture << row_3 }
picture
end
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