508 lines
13 KiB
Ruby
508 lines
13 KiB
Ruby
# frozen_string_literal: true
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module TTFunk
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class Table
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class Cff < TTFunk::Table
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# CFF Charstring.
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class Charstring
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# Type 2 charstring operators
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CODE_MAP = {
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1 => :hstem,
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3 => :vstem,
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4 => :vmoveto,
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5 => :rlineto,
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6 => :hlineto,
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7 => :vlineto,
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8 => :rrcurveto,
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10 => :callsubr,
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12 => :flex_select,
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14 => :endchar,
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18 => :hstemhm,
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19 => :hintmask,
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20 => :cntrmask,
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21 => :rmoveto,
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22 => :hmoveto,
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23 => :vstemhm,
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24 => :rcurveline,
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25 => :rlinecurve,
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26 => :vvcurveto,
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27 => :hhcurveto,
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28 => :shortint,
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29 => :callgsubr,
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30 => :vhcurveto,
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31 => :hvcurveto,
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}.freeze
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# Type 2 Flex operators.
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FLEX_CODE_MAP = {
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35 => :flex,
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34 => :hflex,
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36 => :hflex1,
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37 => :flex1,
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}.freeze
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# Glyph ID.
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# @return [Integer]
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attr_reader :glyph_id
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# Encoded charstring.
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# @return [String]
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attr_reader :raw
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# @param glyph_id [Integer]
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# @param top_dict [TTFunk::Table:Cff::TopDict]
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# @param font_dict [TTFunk::Table:Cff::FontDict]
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# @param raw [String]
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def initialize(glyph_id, top_dict, font_dict, raw)
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@glyph_id = glyph_id
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@top_dict = top_dict
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@font_dict = font_dict
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@raw = raw
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default_width_x = (@font_dict || @top_dict).private_dict.default_width_x
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@nominal_width_x = (@font_dict || @top_dict).private_dict.nominal_width_x
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@subrs = (@font_dict || @top_dict).private_dict.subr_index
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@gsubrs = @top_dict.cff.global_subr_index
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@subrs_bias = @subrs.bias if @subrs
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@gsubrs_bias = @gsubrs.bias if @gsubrs
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@stack = []
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@data = raw.bytes
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@index = 0
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@n_stems = 0
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@have_width = false
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@open = false
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@width = default_width_x
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@x = 0
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@y = 0
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end
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# Get path representation of this charstring.
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#
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# @return [TTFunk::Table::Cff::Path]
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def path
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@path || begin
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@path = Path.new
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parse!
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@path
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end
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end
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# Get a TrueType-compatible glyph representation of this charstring.
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#
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# @return [TTFunk::Table::Glyf::PathBased]
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def glyph
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@glyph ||=
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begin
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horizontal_metrics = @top_dict.file.horizontal_metrics.for(glyph_id)
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Glyf::PathBased.new(path, horizontal_metrics)
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end
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end
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# Get path representation of this charstring at the specified font size.
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#
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# @param x [Integer, Float] new horizontal position.
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# @param y [Integer, Float] new vertical position.
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# @param font_size [Integer, Float] font size.
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# @return [TTFunk::Table::Cff::Path]
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def render(x: 0, y: 0, font_size: 72)
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path.render(
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x: x,
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y: y,
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font_size: font_size,
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units_per_em: @top_dict.file.header.units_per_em,
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)
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end
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private
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def parse!
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until @index >= @data.size
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code = @data[@index]
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@index += 1
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# return from callgsubr - do nothing since we inline subrs
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next if code == 11
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if code >= 32 && code <= 246
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@stack << (code - 139)
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elsif (m = CODE_MAP[code])
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__send__(m)
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elsif code >= 247 && code <= 250
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b0 = code
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b1 = @data[@index]
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@index += 1
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@stack << (((b0 - 247) * 256) + b1 + 108)
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elsif code >= 251 && code <= 254
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b0 = code
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b1 = @data[@index]
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@index += 1
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@stack << ((-(b0 - 251) * 256) - b1 - 108)
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else
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b1, b2, b3, b4 = read_bytes(4)
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@stack << (((b1 << 24) | (b2 << 16) | (b3 << 8) | b4) / 65_536)
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end
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end
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end
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def read_bytes(length)
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bytes = @data[@index, length]
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@index += length
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bytes
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end
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def hstem
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stem
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end
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def vstem
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stem
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end
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# rubocop:disable Style/EvenOdd
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def stem
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# The number of stem operators on the stack is always even.
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# If the value is uneven, that means a width is specified.
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has_width_arg = @stack.size % 2 == 1
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if has_width_arg && !@have_width
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@width = @stack.shift + @nominal_width_x
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end
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@n_stems += @stack.length >> 1
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@stack.clear
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@have_width = true
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end
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# rubocop:enable Style/EvenOdd
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def vmoveto
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if @stack.size > 1 && !@have_width
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@width = @stack.shift + @nominal_width_x
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@have_width = true
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end
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@y += @stack.pop
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add_contour(@x, @y)
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end
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def add_contour(x, y)
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if @open
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@path.close_path
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end
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@path.move_to(x, y)
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@open = true
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end
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def rlineto
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until @stack.empty?
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@x += @stack.shift
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@y += @stack.shift
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@path.line_to(@x, @y)
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end
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end
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def hlineto
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until @stack.empty?
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@x += @stack.shift
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@path.line_to(@x, @y)
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break if @stack.empty?
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@y += @stack.shift
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@path.line_to(@x, @y)
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end
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end
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def vlineto
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until @stack.empty?
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@y += @stack.shift
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@path.line_to(@x, @y)
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break if @stack.empty?
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@x += @stack.shift
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@path.line_to(@x, @y)
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end
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end
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def rrcurveto
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until @stack.empty?
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c1x = @x + @stack.shift
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c1y = @y + @stack.shift
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@x = c2x + @stack.shift
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@y = c2y + @stack.shift
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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end
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end
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def callsubr
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code_index = @stack.pop + @subrs_bias
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subr_code = @subrs[code_index].bytes
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@data[@index, 0] = subr_code
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end
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def flex_select
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flex_code = @data[@index]
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@index += 1
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__send__(FLEX_CODE_MAP[flex_code])
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end
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def flex
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c1x = @x + @stack.shift # dx1
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c1y = @y + @stack.shift # dy1
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c2x = c1x + @stack.shift # dx2
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c2y = c1y + @stack.shift # dy2
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jpx = c2x + @stack.shift # dx3
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jpy = c2y + @stack.shift # dy3
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c3x = jpx + @stack.shift # dx4
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c3y = jpy + @stack.shift # dy4
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c4x = c3x + @stack.shift # dx5
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c4y = c3y + @stack.shift # dy5
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@x = c4x + @stack.shift # dx6
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@y = c4y + @stack.shift # dy6
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@stack.shift # flex depth
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@path.curve_to(c1x, c1y, c2x, c2y, jpx, jpy)
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@path.curve_to(c3x, c3y, c4x, c4y, @x, @y)
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end
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def hflex
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c1x = @x + @stack.shift # dx1
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c1y = @y # dy1
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c2x = c1x + @stack.shift # dx2
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c2y = c1y + @stack.shift # dy2
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jpx = c2x + @stack.shift # dx3
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jpy = c2y # dy3
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c3x = jpx + stack.shift # dx4
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c3y = c2y # dy4
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c4x = c3x + stack.shift # dx5
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c4y = @y # dy5
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@x = c4x + stack.shift # dx6
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@path.curve_to(c1x, c1y, c2x, c2y, jpx, jpy)
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@path.curve_to(c3x, c3y, c4x, c4y, @x, @y)
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end
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def hflex1
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c1x = @x + @stack.shift # dx1
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c1y = @y + @stack.shift # dy1
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c2x = c1x + @stack.shift # dx2
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c2y = c1y + @stack.shift # dy2
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jpx = c2x + @stack.shift # dx3
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jpy = c2y # dy3
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c3x = jpx + @stack.shift # dx4
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c3y = c2y # dy4
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c4x = c3x + @stack.shift # dx5
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c4y = c3y + @stack.shift # dy5
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@x = c4x + @stack.shift # dx6
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@path.curve_to(c1x, c1y, c2x, c2y, jpx, jpy)
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@path.curve_to(c3x, c3y, c4x, c4y, @x, @y)
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end
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def flex1
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c1x = @x + @stack.shift # dx1
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c1y = @y + @stack.shift # dy1
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c2x = c1x + @stack.shift # dx2
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c2y = c1y + @stack.shift # dy2
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jpx = c2x + @stack.shift # dx3
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jpy = c2y + @stack.shift # dy3
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c3x = jpx + @stack.shift # dx4
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c3y = jpy + @stack.shift # dy4
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c4x = c3x + @stack.shift # dx5
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c4y = c3y + @stack.shift # dy5
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if (c4x - @x).abs > (c4y - @y).abs
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@x = c4x + @stack.shift
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else
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@y = c4y + @stack.shift
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end
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@path.curve_to(c1x, c1y, c2x, c2y, jpx, jpy)
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@path.curve_to(c3x, c3y, c4x, c4y, @x, @y)
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end
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def endchar
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if !@stack.empty? && !@have_width
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@width = @stack.shift + @nominal_width_x
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@have_width = true
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end
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if @open
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@path.close_path
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@open = false
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end
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end
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def hstemhm
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stem
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end
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def hintmask
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cntrmask
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end
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def cntrmask
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stem
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# skip past hinting data, no need to worry about it since we're not
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# very concerned about rendering glyphs
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read_bytes((@n_stems + 7) >> 3)
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end
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def rmoveto
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if @stack.size > 2 && !@have_width
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@width = @stack.shift + @nominal_width_x
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@have_width = true
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end
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@y += @stack.pop
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@x += @stack.pop
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add_contour(@x, @y)
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end
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def hmoveto
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if @stack.size > 1 && !@have_width
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@width = @stack.shift + @nominal_width_x
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@have_width = true
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end
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@x += @stack.pop
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add_contour(@x, @y)
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end
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def vstemhm
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stem
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end
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def rcurveline
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while @stack.size > 2
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c1x = @x + @stack.shift
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c1y = @y + @stack.shift
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@x = c2x + @stack.shift
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@y = c2y + @stack.shift
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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end
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@x += @stack.shift
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@y += @stack.shift
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@path.line_to(@x, @y)
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end
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def rlinecurve
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while @stack.size > 6
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@x += @stack.shift
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@y += @stack.shift
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@path.line_to(@x, @y)
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end
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c1x = @x + @stack.shift
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c1y = @y + @stack.shift
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@x = c2x + @stack.shift
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@y = c2y + @stack.shift
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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end
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# rubocop:disable Style/EvenOdd
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def vvcurveto
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if @stack.size % 2 == 1
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@x += @stack.shift
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end
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until @stack.empty?
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c1x = @x
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c1y = @y + @stack.shift
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@x = c2x
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@y = c2y + @stack.shift
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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end
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end
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def hhcurveto
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if @stack.size % 2 == 1
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@y += @stack.shift
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end
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until @stack.empty?
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c1x = @x + @stack.shift
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c1y = @y
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@x = c2x + @stack.shift
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@y = c2y
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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end
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end
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# rubocop:enable Style/EvenOdd
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def shortint
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b1, b2 = read_bytes(2)
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@stack << (((b1 << 24) | (b2 << 16)) >> 16)
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end
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def callgsubr
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code_index = @stack.pop + @gsubrs_bias
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subr_code = @gsubrs[code_index].bytes
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@data[@index, 0] = subr_code
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end
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def vhcurveto
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until @stack.empty?
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c1x = @x
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c1y = @y + @stack.shift
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@x = c2x + @stack.shift
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@y = c2y + (@stack.size == 1 ? @stack.shift : 0)
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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break if @stack.empty?
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c1x = @x + @stack.shift
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c1y = @y
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@y = c2y + @stack.shift
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@x = c2x + (@stack.size == 1 ? @stack.shift : 0)
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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end
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end
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def hvcurveto
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until @stack.empty?
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c1x = @x + @stack.shift
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c1y = @y
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@y = c2y + @stack.shift
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@x = c2x + (@stack.size == 1 ? @stack.shift : 0)
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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break if @stack.empty?
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c1x = @x
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c1y = @y + @stack.shift
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c2x = c1x + @stack.shift
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c2y = c1y + @stack.shift
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@x = c2x + @stack.shift
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@y = c2y + (@stack.size == 1 ? @stack.shift : 0)
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@path.curve_to(c1x, c1y, c2x, c2y, @x, @y)
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end
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end
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end
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end
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end
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end
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