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# frozen_string_literal: true
require_relative '../table'
module TTFunk
class Table
# PostScript (`post`) table.
#
# This class can be extended with version-specific modules.
#
# @see TTFunk::Table::Post::Format10
# @see TTFunk::Table::Post::Format20
# @see TTFunk::Table::Post::Format30
# @see TTFunk::Table::Post::Format40
class Post < Table
# Table version.
# @return [Integer]
attr_reader :format
# Italic angle in counter-clockwise degrees from the vertical.
# @return [Integer]
attr_reader :italic_angle
# Suggested distance of the top of the underline from the baseline
# @return [Integer]
attr_reader :underline_position
# Suggested values for the underline thickness.
# @return [Integer]
attr_reader :underline_thickness
# 0 if the font is proportionally spaced, non-zero if the font is not
# proportionally spaced.
# @return [Integer]
attr_reader :fixed_pitch
# Minimum memory usage when an OpenType font is downloaded.
# @return [Integer]
attr_reader :min_mem_type42
# Maximum memory usage when an OpenType font is downloaded.
# @return [Integer]
attr_reader :max_mem_type42
# Minimum memory usage when an OpenType font is downloaded as
# a Type 1 font.
# @return [Integer]
attr_reader :min_mem_type1
# Maximum memory usage when an OpenType font is downloaded as
# a Type 1 font.
# @return [Integer]
attr_reader :max_mem_type1
# Version-specific fields.
# @return [TTFunk::Table::Post::Format10, TTFunk::Table::Post::Format20,
# TTFunk::Table::Post::Format30, TTFunk::Table::Post::Format40]
attr_reader :subtable
# Encode table.
#
# @param post [TTFunk::Table::Post]
# @param mapping [Hash{Integer => Integer}] keys are new glyph IDs, values
# are old glyph IDs
# @return [String, nil]
def self.encode(post, mapping)
return if post.nil?
post.recode(mapping)
end
# Is this font monospaced?
#
# @return [Boolean]
def fixed_pitch?
@fixed_pitch != 0
end
# Get glyph name for character code.
#
# This is a placeholder.
#
# @param _code [Integer]
# @return [String]
def glyph_for(_code)
'.notdef'
end
# Re-encode this table.
#
# @param mapping [Hash{Integer => Integer}] keys are new glyph IDs, values
# are old glyph IDs
# @return [String]
def recode(mapping)
return raw if format == 0x00030000
table = raw[0, 32]
table[0, 4] = [0x00020000].pack('N')
index = []
strings = []
mapping.keys.sort.each do |new_id|
post_glyph = glyph_for(mapping[new_id])
position = Format10::POSTSCRIPT_GLYPHS.index(post_glyph)
if position
index << position
else
index << (257 + strings.length)
strings << post_glyph
end
end
table << [mapping.length, *index].pack('n*')
strings.each do |string|
table << [string.length, string].pack('CA*')
end
table
end
private
def parse!
@format, @italic_angle, @underline_position, @underline_thickness,
@fixed_pitch, @min_mem_type42, @max_mem_type42,
@min_mem_type1, @max_mem_type1 = read(32, 'N2n2N*')
@subtable =
case @format
when 0x00010000
extend(Post::Format10)
when 0x00020000
extend(Post::Format20)
when 0x00025000
raise NotImplementedError,
'Post format 2.5 is not supported by TTFunk'
when 0x00030000
extend(Post::Format30)
when 0x00040000
extend(Post::Format40)
end
parse_format!
end
def parse_format!
warn(Kernel.format('postscript table format 0x%08X is not supported', @format))
end
end
end
end
require_relative 'post/format10'
require_relative 'post/format20'
require_relative 'post/format30'
require_relative 'post/format40'
|
