class TTFunk::Table::Glyf::Compound
Constants
- ARG_1_AND_2_ARE_WORDS
- Component
- MORE_COMPONENTS
- WE_HAVE_AN_X_AND_Y_SCALE
- WE_HAVE_A_SCALE
- WE_HAVE_A_TWO_BY_TWO
- WE_HAVE_INSTRUCTIONS
Attributes
glyph_ids[R]
id[R]
number_of_contours[R]
raw[R]
x_max[R]
x_min[R]
y_max[R]
y_min[R]
Public Class Methods
new(id, raw)
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# File lib/ttfunk/table/glyf/compound.rb, line 25 def initialize(id, raw) @id = id @raw = raw io = StringIO.new(raw) @number_of_contours, @x_min, @y_min, @x_max, @y_max = io.read(10).unpack('n*').map do |i| BinUtils.twos_comp_to_int(i, bit_width: 16) end # Because TTFunk only cares about glyphs insofar as they (1) provide # a bounding box for each glyph, and (2) can be rewritten into a # font subset, we don't really care about the rest of the glyph data # except as a whole. Thus, we don't actually decompose the glyph # into it's parts--all we really care about are the locations within # the raw string where the component glyph ids are stored, so that # when we rewrite this glyph into a subset we can rewrite the # component glyph-ids so they are correct for the subset. @glyph_ids = [] @glyph_id_offsets = [] offset = 10 # 2 bytes for each of num-contours, min x/y, max x/y loop do flags, glyph_id = @raw[offset, 4].unpack('n*') @glyph_ids << glyph_id @glyph_id_offsets << offset + 2 break unless flags & MORE_COMPONENTS != 0 offset += 4 offset += if (flags & ARG_1_AND_2_ARE_WORDS).zero? 2 else 4 end if flags & WE_HAVE_A_TWO_BY_TWO != 0 offset += 8 elsif flags & WE_HAVE_AN_X_AND_Y_SCALE != 0 offset += 4 elsif flags & WE_HAVE_A_SCALE != 0 offset += 2 end end end
Public Instance Methods
compound?()
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# File lib/ttfunk/table/glyf/compound.rb, line 74 def compound? true end
recode(mapping)
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# File lib/ttfunk/table/glyf/compound.rb, line 78 def recode(mapping) result = raw.dup new_ids = glyph_ids.map { |id| mapping[id] } new_ids.zip(@glyph_id_offsets).each do |new_id, offset| result[offset, 2] = [new_id].pack('n') end result end