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brush.rb
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brush.rb
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$KCODE = 'UTF-8'
require 'rubygems'
require 'RMagick'
require 'iconv'
require 'base'
require 'stringio'
module GroomLake
class Brush < Base
def initialize(preset_file = nil)
super
@version = nil
@subversion = nil
parse_abr_file unless @io.nil?
end
def parse_abr_file
parse_header
parse_brushes
end
def parse_header
end
def parse_brushes
@version = @io.read(2).unpack('n')[0]
puts "VERSION #{@version}"
case @version
when 6
@subversion = @io.read(2).unpack('n')[0]
puts "SUBV: #{@subversion}"
@io.read(8) #8BIMsamp
sample_size = @io.read(4).unpack('N')[0]
endsample = sample_size + 12
while(@io.pos < endsample - 1)
#brush size in bytes
brush_size = @io.read(4).unpack('N')[0]
brush_end = brush_size
puts "BRUSH SIZE: #{brush_size}"
while(brush_end % 4 != 0)
brush_end += 1
end
offset = brush_end - brush_size
puts "FBC: #{offset}"
puts "POS1: #{@io.pos}"
key = @io.read(37)
puts "POS2: #{@io.pos}"
if @subversion == 1
puts 'yeah'
elsif @subversion == 2
@io.pos += 264
padh, padw = @io.read(8).unpack('NN')
puts "W: #{padw}, H: #{padh}"
height, width = @io.read(8).unpack('NN')
width -= padw
height -= padh
puts "WW: #{width}, HH: #{height}"
end
depth = @io.read(2).unpack('n')[0]
puts "DEPTH: #{depth}"
compression = @io.read(1).unpack('b')[0]
scanline_image = 0
height.times do
scanline_image = scanline_image + @io.read(2).unpack('n')[0]
end
scan = @io.read(scanline_image)
write_image(Time.now.to_s + 'brush', width, height, scan)
@io.read(offset) if @subversion == 1
if(@subversion == 2)
@io.read(8)
@io.read(offset)
end
return
end
when 2
brush_count = @io.read(2).unpack('n')[0]
puts brush_count
1.upto(brush_count) do
#Brush type, 1 = computed, 2 = sampled
type = @io.read(2).unpack('n')[0]
#Number of bytes in the remainder of the brush definition
brush_bytes = @io.read(4).unpack('N')
if type == 1
@io.read(14) if @version == 1
elsif type == 2
@io.read(4) # Misc ignored
#brush spacing
spacing = @io.read(2).unpack('n')
puts "SPACING: #{spacing}"
# Length of the brush name
name_length = @io.read(4).unpack('xxn')[0]
#read it and convert it to utf-8
utf8_name = @io.read(name_length * 2).unpack('C*').pack('U*')
name = Iconv.iconv('UTF-8', 'UTF-16', utf8_name)[0].chop
puts name
@io.read(1) # Oh noez, the forgotton byte
top, left, bottom, right = @io.read(8).unpack('nnnn')
#long integer version of numbers above
ltop, lleft, lbottom, lright = @io.read(16).unpack('NNNN')
brush_width = lright - lleft
brush_height = lbottom - ltop
puts brush_width
puts brush_height
depth = @io.read(2).unpack('n')[0]
puts "DEPTH: #{depth}"
compression = @io.read(1).unpack('b')[0]
puts "COMPRESSION: #{compression}"
if compression == 0
decompression_data = @io.read(brush_width * brush_height)
else
puts "HEIGHT: #{brush_height}"
scanline_image = 0
brush_height.times do
scanline_image = scanline_image + @io.read(2).unpack('n')[0]
end
puts "SCI: #{scanline_image}"
scan = @io.read(scanline_image)
img = Magick::Image.new(brush_width, brush_height)
unpacked_data = unpack_scanline_data(scan)
img.import_pixels(0, 0, brush_width, brush_height, "A", unpacked_data, Magick::CharPixel)
img.format = "PNG"
img = img.colorize(1, 1, 1, '#000000')
img.write('../../vendor/' + name.downcase + ".png")
end
end
end
end
end
# Unpack a scanline image using the PackBits algorithm.
def unpack_scanline_data(data)
str = StringIO.new(data)
image = []
until str.eof?
count = str.readchar
count = -256 + count if(count >= 128)
if(count >= 0)
continue if(count == -128)
(count + 1).times do
image << str.readchar
end
else
copy = str.readchar
count = -count + 1
count.times do
image << copy
end
end
end
return image
end
def write_image(name, width, height, scanline_data)
img = Magick::Image.new(width, height)
unpacked_data = unpack_scanline_data(scanline_data)
img.import_pixels(0, 0, width, height, "A", unpacked_data, Magick::CharPixel)
img.format = "PNG"
img = img.colorize(1, 1, 1, '#000000')
img.write('../../vendor/' + name.downcase + ".png")
end
end
end
GroomLake::Brush.new('../../test/presets/three-various-brushes.abr')
#GroomLake::Brush.new('../../test/presets/cs2-square-brushes.abr')
#GroomLake::Brush.new('../../test/presets/onesquare24hard.abr')
#GroomLake::Brush.new('../../test/presets/cs2-oldbooks.abr')