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# frozen_string_literal: true
require 'spec_helper'
require 'stringio'
require 'ttfunk/subset'
describe 'subsetting' do # rubocop: disable RSpec/DescribeClass
let(:space_char) { TTFunk::Subset::Unicode::SPACE_CHAR }
it 'consistently names font for same subsets' do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset1 = TTFunk::Subset.for(font, :unicode)
subset1.use(97)
name1 = TTFunk::File.new(subset1.encode).name.strings[6]
subset2 = TTFunk::Subset.for(font, :unicode)
subset2.use(97)
name2 = TTFunk::File.new(subset2.encode).name.strings[6]
expect(name1).to eq name2
end
it 'can reconstruct an entire font' do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset = TTFunk::Subset.for(font, :unicode)
font.cmap.unicode.first.code_map.each_key do |code_point|
subset.use(code_point)
end
expect { subset.encode }.to_not raise_error
end
it 'always includes the space glyph' do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset = TTFunk::Subset.for(font, :unicode)
new_font = TTFunk::File.new(subset.encode)
# space should be GID 1 since it's the only glyph in the font
# (0 is always .notdef)
expect(new_font.cmap.unicode.first[space_char]).to eq(1)
end
it "explodes if the space glyph isn't included" do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset = TTFunk::Subset.for(font, :unicode)
subset.instance_variable_get(:@subset).delete(space_char)
expect { subset.encode }.to raise_error(/Space glyph .* must be included/)
end
it 'changes font names for different subsets' do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset1 = TTFunk::Subset.for(font, :unicode)
subset1.use(97)
name1 = TTFunk::File.new(subset1.encode).name.strings[6]
subset2 = TTFunk::Subset.for(font, :unicode)
subset2.use(97)
subset2.use(98)
name2 = TTFunk::File.new(subset2.encode).name.strings[6]
expect(name1).to_not eq name2
end
it 'calculates checksum correctly for empty table data' do
font = TTFunk::File.open(test_font('Mplus1p'))
subset1 = TTFunk::Subset.for(font, :unicode)
expect { subset1.encode }.to_not raise_error
end
it 'generates font directory with tables in ascending order' do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset = TTFunk::Subset.for(font, :unicode)
subset.use(97)
directory = TTFunk::File.new(subset.encode).directory
table_tags = directory.tables.keys
expect(table_tags.sort).to eq(table_tags)
expect(table_tags.first).to be < table_tags.last
end
it 'calculates search_range, entry_selector & range_shift values' do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset = TTFunk::Subset.for(font, :unicode)
subset.use(97)
subset_io = StringIO.new(subset.encode)
scaler_type, table_count = subset_io.read(6).unpack('Nn')
search_range, entry_selector, range_shift =
subset_io.read(6).unpack('nnn')
# Subset fonts include 14 tables by default.
expected_table_count = 14
# Smallest power of two less than number of tables, times 16.
expected_search_range = 8 * 16
# Log2 of max power of two smaller than number of tables.
expected_entry_selector = 3
# Range shift is defined as 16*table_count - search_range.
expected_range_shift = (16 * expected_table_count) - expected_search_range
expect(scaler_type).to eq(font.directory.scaler_type)
expect(table_count).to eq(expected_table_count)
expect(search_range).to eq(expected_search_range)
expect(entry_selector).to eq(expected_entry_selector)
expect(range_shift).to eq(expected_range_shift)
end
it 'knows which characters it includes' do
font = TTFunk::File.open(test_font('DejaVuSans'))
unicode = TTFunk::Subset.for(font, :unicode)
unicode_8bit = TTFunk::Subset.for(font, :unicode_8bit)
mac_roman = TTFunk::Subset.for(font, :mac_roman)
windows1252 = TTFunk::Subset.for(font, :windows_1252) # rubocop: disable Naming/VariableNumber
[unicode, unicode_8bit, mac_roman, windows1252].each do |subset|
expect(subset).to_not be_includes(97)
subset.use(97)
expect(subset).to be_includes(97)
end
end
it 'maps final code 0xFFFF to glyph 0 in generated type 4 cmap' do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset = TTFunk::Subset.for(font, :unicode)
subset.use(97)
cmap = TTFunk::File.new(subset.encode).cmap
# Unicode subsets only contain a single format 4 cmap subtable.
expect(cmap.tables.size).to eq(1)
format04 = cmap.tables.first
expect(format04.format).to eq(4)
expect(format04.code_map[0xFFFF]).to eq(0)
end
it 'sorts records in the name table correctly' do
font = TTFunk::File.open(test_font('DejaVuSans'))
subset = TTFunk::Subset.for(font, :unicode)
subset.use(97)
name = TTFunk::File.new(subset.encode).name
records = []
name.entries.each do |entry|
records << [
entry[:platform_id],
entry[:encoding_id],
entry[:language_id],
entry[:name_id],
]
end
expect(records).to eq(records.sort)
end
end
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