font_test_data/ift.rs
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//! Test data for the IFT table
//!
//! Used for incremental font transfer. Specification:
//! <https://w3c.github.io/IFT/Overview.html>
use read_fonts::types::Tag;
use read_fonts::{be_buffer, be_buffer_add, test_helpers::BeBuffer, types::Int24, types::Uint24};
use write_fonts::{
tables::{head::Head, loca::Loca, maxp::Maxp},
FontBuilder,
};
pub static IFT_BASE: &[u8] = include_bytes!("../test_data/ttf/ift_base.ttf");
// Format specification: https://w3c.github.io/IFT/Overview.html#patch-map-format-1
pub fn simple_format1() -> BeBuffer {
let mut buffer = be_buffer! {
/* ### Header ### */
1u8, // format
0u32, // reserved
[1u32, 2, 3, 4], // compat id
2u16, // max entry id
{2u16: "max_glyph_map_entry_id"},
(Uint24::new(7)), // glyph count
{0u32: "glyph_map_offset"},
0u32, // feature map offset
0b00000010u8, // applied entry bitmap (entry 1)
8u16, // uri template length
{b'A': "uri_template[0]"},
{b'B': "uri_template[1]"},
[b'C', b'D', b'E', b'F', 0xc9, 0xa4], // uri_template[2..7]
{3u8: "patch_encoding"}, // = glyph keyed
/* ### Glyph Map ### */
{1u16: "glyph_map"}, // first mapped glyph
{2u8: "entry_index[1]"},
[1u8, 0, 1, 0, 0] // entry index[2..6]
};
let offset = buffer.offset_for("glyph_map") as u32;
buffer.write_at("glyph_map_offset", offset);
buffer
}
pub fn u16_entries_format1() -> BeBuffer {
let mut buffer = be_buffer! {
1u8, // format
0u32, // reserved
[1, 2, 3, 4u32], // compat id
300u16, // max entry id
300u16, // max glyph map entry id
(Uint24::new(7)), // glyph count
{0u32: "glyph_map_offset"},
{0u32: "feature_map_offset"},
// applied entry bitmap (38 bytes)
[
0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0, 0u8
],
8u16, // uriTemplateLength
[b'A', b'B', b'C', b'D', b'E', b'F', 0xc9, 0xa4], // uriTemplate[8]
3u8, // patch encoding = glyph keyed
/* ### Glyph Map ### */
{2u16: "glyph_map"}, // first mapped glyph
// entryIndex[2..6]
[80, 81, 300, 300, 80u16]
};
let offset = buffer.offset_for("glyph_map") as u32;
buffer.write_at("glyph_map_offset", offset);
buffer
}
pub fn feature_map_format1() -> BeBuffer {
let mut buffer = be_buffer! {
/* ### Header ### */
1u8, // format
0u32, // reserved
[1u32, 2u32, 3u32, 4u32], // compat id
400u16, // max entry id
300u16, // max glyph map entry id
(Uint24::new(7)), // glyph count
{0u32: "glyph_map_offset"},
{0u32: "feature_map_offset"},
// applied entry bitmap (51 bytes) - 300 is applied
[
0, 0, 0, 0, 0, 0, 0, 0, // [0, 64)
0, 0, 0, 0, 0, 0, 0, 0, // [64, 128)
0, 0, 0, 0, 0, 0, 0, 0, // [128, 192)
0, 0, 0, 0, 0, 0, 0, 0, // [192, 256)
0, 0, 0, 0, 0, 0b00001000, 0, 0, // [256, 320)
0, 0, 0, 0, 0, 0, 0, 0, // [320, 384)
0, 0, 0u8 // [384, 400)
],
8u16, // uriTemplateLength
[b'A', b'B', b'C', b'D', b'E', b'F', 0xc9, 0xa4], // uriTemplate[8]
3u8, // patch encoding = glyph keyed
/* ### Glyph Map ### */
{2u16: "glyph_map"}, // first mapped glyph
// entryIndex[2..6]
[
80, // gid 2
81, // gid 3
300, // gid 4
299, // gid 5
80u16 // gid 6
],
// ## Feature Map ##
{3u16: "feature_map"}, // feature count
// FeatureRecord[0]
{(Tag::new(b"dlig")): "FeatureRecord[0]"}, // feature tag
400u16, // first new entry index
1u16, // entry map count
// FeatureRecord[1]
{(Tag::new(b"liga")): "FeatureRecord[1]"}, // feature tag
384u16, // first new entry index
2u16, // entry map count
// FeatureRecord[2]
[b'n', b'u', b'l', b'l'], // feature tag
301u16, // first new entry index
1u16, // entry map count
// EntryMapRecord[0]: "dlig" + entry 81 => entry 400
81u16, // first_entry_index
81u16, // last_entry_index
// EntryMapRecord[1]: "liga" + entry [80, 81] => entry 384
80u16, // first_entry_index
81u16, // last_entry_index
// EntryMapRecord[2]: "liga" + entry [299, 300] => entry 385
299u16, // first_entry_index
300u16, // last_entry_index
// EntryMapRecord[3]: "null" + entry 0 => entry 301
0u16, // first_entry_index
0u16 // last_entry_index
};
let offset = buffer.offset_for("glyph_map") as u32;
buffer.write_at("glyph_map_offset", offset);
let offset = buffer.offset_for("feature_map") as u32;
buffer.write_at("feature_map_offset", offset);
buffer
}
// Format specification: https://w3c.github.io/IFT/Overview.html#patch-map-format-2
pub fn codepoints_only_format2() -> BeBuffer {
let mut buffer = be_buffer! {
2u8, // format
0u32, // reserved
[1, 2, 3, 4u32], // compat id
3u8, // default patch encoding
(Uint24::new(4)), // entry count
{0u32: "entries_offset"},
0u32, // entry string data offset
8u16, // uriTemplateLength
[b'A', b'B', b'C', b'D', b'E', b'F', 0xc9, 0xa4], // uriTemplate[8]
/* ### Entries Array ### */
// Entry id = 1
{0b00010000u8: "entries"}, // format = CODEPOINT_BIT_1
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [0..17]
// Entry id = 2
0b01100000u8, // format = IGNORED | CODEPOINT_BIT_2
5u16, // bias
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [5..22]
// Entry id = 3
0b00100000u8, // format = CODEPOINT_BIT_2
5u16, // bias
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [5..22]
// Entry id = 4
0b00110000u8, // format = CODEPOINT_BIT_1 | CODEPOINT_BIT_2
(Uint24::new(80_000)), // bias
[0b00001101, 0b00000011, 0b00110001u8] // codepoints = [80_005..80_022]
};
let offset = buffer.offset_for("entries") as u32;
buffer.write_at("entries_offset", offset);
buffer
}
pub fn features_and_design_space_format2() -> BeBuffer {
let mut buffer = be_buffer! {
2u8, // format
0u32, // reserved
[1, 2, 3, 4u32], // compat id
3u8, // default patch encoding
(Uint24::new(3)), // entry count
{0u32: "entries_offset"},
0u32, // entry id string data offset
8u16, // uriTemplateLength
[b'A', b'B', b'C', b'D', b'E', b'F', 0xc9, 0xa4], // uriTemplate[8]
/* ### Entries Array ### */
// Entry id = 1
{0b00010001u8: "entries"}, // format = CODEPOINT_BIT_1 | FEATURES_AND_DESIGN_SPACE
2u8, // feature count = 2
(Tag::new(b"liga")), // feature[0] = liga
(Tag::new(b"smcp")), // feature[1] = smcp
1u16, // design space count
(Tag::new(b"wdth")), // tag = wdth
{0x8000u32: "wdth start"}, // start = 0.5
0x10000u32, // end = 1.0
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [0..17]
// Entries Array
// Entry id = 2
0b00010001u8, // format = CODEPOINT_BIT_1 | FEATURES_AND_DESIGN_SPACE
1u8, // feature count
(Tag::new(b"rlig")), // feature[0]
0u16, // design space count
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [0..17]
// Entry id = 3
0b000100001u8, // format = CODEPOINT_BIT_2 | FEATURES_AND_DESIGN_SPACE
1u8, // feature count = 1
(Tag::new(b"smcp")), // feature[0] = smcp
3u16, // design space count
(Tag::new(b"wght")), // tag = wght
0x00C8_0000u32, // start = 200
0x02BC_0000u32, // end = 700
(Tag::new(b"wdth")), // tag = wdth
0x0u32, // start = 0
0x8000, // end = 0
(Tag::new(b"wdth")), // tag = wdth
0x0002_0000, // start = 2.0
0x0002_8000, // end = 2.5
5u16, // bias = 5
0b00001101, 0b00000011, 0b00110001 // codepoints = [5..22]
};
let offset = buffer.offset_for("entries") as u32;
buffer.write_at("entries_offset", offset);
buffer
}
pub fn copy_indices_format2() -> BeBuffer {
let mut buffer = be_buffer! {
2u8, // format
0u32, // reserved
[1, 2, 3, 4u32], // compat id
3u8, // default patch encoding = glyph keyed
(Uint24::new(9)), // entry count
{0u32: "entries_offset"}, // entries offset
0u32, // entry id string data offset
8u16, // uriTemplateLength
[b'A', b'B', b'C', b'D', b'E', b'F', 0xc9, 0xa4], // uriTemplate[8]
// Entries Array
// Entry id = 1
{0b01100000u8: "entries"}, // format = CODEPOINT_BIT_2 | IGNORED
5u16, // bias = 5
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [5..22]
// Entry id = 2
0b00100000u8, // format = CODEPOINT_BIT_2
50u16, // bias
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [50..67]
// Entry id = 3
0b00000001u8, // format = FEATURES_AND_DESIGN_SPACE
1u8, // feature count = 1
(Tag::new(b"rlig")), // feature[0] = rlig
1u16, // design space count = 1
(Tag::new(b"wght")), // tag = wght
0x00C8_0000u32, // start = 200
0x02BC_0000u32, // end = 700
// Entry id = 4
0b00000001u8, // format = FEATURES_AND_DESIGN_SPACE
1u8, // feature count
(Tag::new(b"liga")), // feature[0] = liga
1u16, // design space count
(Tag::new(b"wght")), // tag = wght
0x0032_0000, // start = 50
0x0064_0000, // end = 100
// Entry id = 5
0b00000010u8, // format = COPY_INDICES
1u8, // copy count
(Uint24::new(0)), // copy
// Entry id = 6
0b00000010u8, // format = COPY_INDICES
1u8, // copy count
(Uint24::new(2)), // copy
// Entry id = 7
0b00000010u8, // format = COPY_INDICES
4u8, // copy count
(Uint24::new(3)), // copy[0]
(Uint24::new(2)), // copy[1]
(Uint24::new(1)), // copy[2]
(Uint24::new(0)), // copy[3]
// Entry id = 8
0b00000010u8, // format = COPY_INDICES
2u8, // copy count
(Uint24::new(4)), // copy[0]
(Uint24::new(5)), // copy[1]
// Entry id = 9
0b00100010u8, // format = CODEPOINT_BIT_2 | COPY_INDICES
1u8, // copy count
(Uint24::new(0)), // copy[0]
100u16, // bias
[0b00001101, 0b00000011, 0b00110001u8] // codepoints = [100..117]
};
let offset = buffer.offset_for("entries") as u32;
buffer.write_at("entries_offset", offset);
buffer
}
// Format specification: https://w3c.github.io/IFT/Overview.html#patch-map-format-2
pub fn custom_ids_format2() -> BeBuffer {
let mut buffer = be_buffer! {
2u8, // format
0u32, // reserved
[1, 2, 3, 4u32], // compat id
3u8, // default patch encoding = glyph keyed
{(Uint24::new(4)): "entry_count"}, // entry count
{0u32: "entries_offset"}, // entries offset
0u32, // entry id string data offset
8u16, // uriTemplateLength
[b'A', b'B', b'C', b'D', b'E', b'F', 0xc9, 0xa4], // uriTemplate[8]
// Entries Array
// Entry id = 0
{0b00010100u8: "entries"}, // format = CODEPOINT_BIT_1 | ID_DELTA
(Int24::new(-1)), // id delta
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [0..17]
// Entry id = 6
0b00100100u8, // format = CODEPOINT_BIT_2 | ID_DELTA
{(Int24::new(5)): "id delta"}, // id delta
5u16, // bias
[0b00001101, 0b00000011, 0b00110001u8], // codepoints = [5..22]
// Entry id = 14
0b01000100u8, // format = ID_DELTA | IGNORED
{(Int24::new(7)): "id delta - ignored entry"}, // id delta
// Entry id = 15
0b00101000u8, // format = CODEPOINT_BIT_2 | PATCH_ENCODING
{3u8: "entry[4] encoding"}, // patch encoding = Glyph Keyed
10u16, // bias
[0b00001101, 0b00000011, 0b00110001u8] // codepoints = [10..27]
};
let offset = buffer.offset_for("entries") as u32;
buffer.write_at("entries_offset", offset);
buffer
}
// Format specification: https://w3c.github.io/IFT/Overview.html#patch-map-format-2
pub fn string_ids_format2() -> BeBuffer {
let mut buffer = be_buffer! {
2u8, // format
0u32, // reserved
[1, 2, 3, 4u32], // compat id
3u8, // default patch encoding = glyph keyed
(Uint24::new(6)), // entry count
{0u32: "entries_offset"}, // entries offset
{0u32: "string_data_offset"}, // entry id string data offset
8u16, // uriTemplateLength
[b'A', b'B', b'C', b'D', b'E', b'F', 0xc9, 0xa4], // uriTemplate[8]
/* ### Entry Data ### */
// Entry id = ""
{0b00000000u8: "entries"}, // format = {}
// Entry id = abc
0b00000100u8, // format = ID_DELTA
3u16, // id length
// Entry id = defg
0b00000100u8, // format = ID_DELTA
4u16, // id length
// Entry id = defg
0b00000000u8, // format = {}
// Entry id = hij
0b00000100u8, // format = ID_DELTA
{3u16: "entry[4] id length"}, // id length
// Entry id = ""
0b00000100u8, // format = ID_DELTA
0u16, // id length
/* ### String Data ### */
{b'a': "string_data"},
[b'b', b'c', b'd', b'e', b'f', b'g', b'h', b'i', b'j']
};
let offset = buffer.offset_for("string_data") as u32;
buffer.write_at("string_data_offset", offset);
let offset = buffer.offset_for("entries") as u32;
buffer.write_at("entries_offset", offset);
buffer
}
// Format specification: https://w3c.github.io/IFT/Overview.html#table-keyed
pub fn table_keyed_patch() -> BeBuffer {
let mut buffer = be_buffer! {
{(Tag::new(b"iftk")): "tag"},
0u32, // reserved
[1, 2, 3, 4u32], // compat id
3u16, // patch count
// patch_offsets[3]
{0u32: "patch_off[0]"},
{0u32: "patch_off[1]"},
{0u32: "patch_off[2]"},
{0u32: "patch_off[3]"},
// patch[0]
{(Tag::new(b"tab1")): "patch[0]"},
0u8, // flags
{29u32: "decompressed_len[0]"}, // max decompressed length
// brotli stream (w/ shared dict)
[0xa1, 0xe0, 0x00, 0xc0, 0x2f, 0x3a, 0x38, 0xf4, 0x01, 0xd1, 0xaf, 0x54, 0x84, 0x14, 0x71,
0x2a, 0x80, 0x04, 0xa2, 0x1c, 0xd3, 0xdd, 0x07u8],
// patch[1]
{(Tag::new(b"tab2")): "patch[1]"},
{1u8: "flags[1]"}, // flags (REPLACEMENT)
30u32, // max decompressed length
// brotli stream (w/o shared dict)
[0xa1, 0xe8, 0x00, 0xc0, 0xef, 0x48, 0x9d, 0xfa, 0xdc, 0xf1, 0xc2, 0xac, 0xc5, 0xde, 0xe4, 0xf4,
0xb4, 0x02, 0x48, 0x98, 0x98, 0x52, 0x64, 0xa8, 0x50, 0x20, 0x29, 0x75, 0x0bu8],
// patch[2]
{(Tag::new(b"tab3")): "patch[2]"},
{2u8: "flags[2]"}, // flags (DROP)
{0u32: "end"} // max decompressed length
};
let offset = buffer.offset_for("patch[0]") as u32;
buffer.write_at("patch_off[0]", offset);
let offset = buffer.offset_for("patch[1]") as u32;
buffer.write_at("patch_off[1]", offset);
let offset = buffer.offset_for("patch[2]") as u32;
buffer.write_at("patch_off[2]", offset);
let offset = (buffer.offset_for("end") + 4) as u32;
buffer.write_at("patch_off[3]", offset);
buffer
}
// Format specification: https://w3c.github.io/IFT/Overview.html#table-keyed
pub fn noop_table_keyed_patch() -> BeBuffer {
be_buffer! {
{(Tag::new(b"iftk")): "tag"},
0u32, // reserved
[1, 2, 3, 4u32], // compat id
0u16, // patch count
// patch_offsets[1]
{0u32: "patch_off[0]"}
}
}
pub fn test_font_for_patching_with_loca_mod<F>(loca_mod: F) -> Vec<u8>
where
F: Fn(&mut Vec<u32>),
{
let mut font_builder = FontBuilder::new();
let maxp = Maxp {
num_glyphs: 15,
..Default::default()
};
font_builder.add_table(&maxp).unwrap();
let head = Head {
index_to_loc_format: 0,
..Default::default()
};
font_builder.add_table(&head).unwrap();
// ## glyf ##
// glyphs are padded to even number of bytes since loca format will be short.
let glyf = BeBuffer::new()
.push_with_tag(1u8, "gid_0")
.extend([2, 3, 4, 5u8, 0u8])
.push_with_tag(6u8, "gid_1")
.extend([7, 8u8, 0u8])
.push_with_tag(9u8, "gid_8")
.extend([10, 11, 12u8]);
// ## loca ##
let gid_1 = glyf.offset_for("gid_1") as u32;
let gid_8 = glyf.offset_for("gid_8") as u32;
let end = gid_8 + 4;
let mut loca = vec![
0, // gid 0
gid_1, // gid 1
gid_8, // gid 2
gid_8, // gid 3
gid_8, // gid 4
gid_8, // gid 5
gid_8, // gid 6
gid_8, // gid 7
gid_8, // gid 8
end, // gid 9
end, // gid 10
end, // gid 11
end, // gid 12
end, // gid 13
end, // gid 14
end, // end
];
loca_mod(&mut loca);
let loca = Loca::new(loca);
font_builder.add_table(&loca).unwrap();
let glyf: &[u8] = &glyf;
font_builder.add_raw(Tag::new(b"glyf"), glyf);
font_builder.build()
}
pub fn test_font_for_patching() -> Vec<u8> {
test_font_for_patching_with_loca_mod(|_| {})
}
// Format specification: https://w3c.github.io/IFT/Overview.html#glyph-keyed
pub fn glyph_keyed_patch_header() -> BeBuffer {
be_buffer! {
{(Tag::new(b"ifgk")): "format"}, // format
0u32, // reserved
0u8, // flags (0 = u16 gids)
[6, 7, 8, 9u32], // compatibility id
{0u32: "max_uncompressed_length"}
}
}
// Format specification: https://w3c.github.io/IFT/Overview.html#glyphpatches
pub fn noop_glyf_glyph_patches() -> BeBuffer {
be_buffer! {
0u32, // glyph count
{1u8: "table_count"}, // table count
(Tag::new(b"glyf")), // tables * 1
// glyph data offsets * 1
0u32
}
}
// Format specification: https://w3c.github.io/IFT/Overview.html#glyphpatches
pub fn glyf_u16_glyph_patches() -> BeBuffer {
let mut buffer = be_buffer! {
5u32, // glyph count
{1u8: "table_count"}, // table count
// glyph ids * 5
[2, 7u16],
{8u16: "gid_8"},
[9u16],
{13u16: "gid_13"},
(Tag::new(b"glyf")), // tables * 1
// glyph data offsets * 6
{0u32: "gid_2_offset"},
{0u32: "gid_7_offset"},
{0u32: "gid_8_offset"},
{0u32: "gid_9_offset"},
{0u32: "gid_13_offset"},
{0u32: "end_offset"},
// data blocks
{b'a': "gid_2_data"},
[b'b', b'c'],
{b'd': "gid_7_data"},
[b'e', b'f', b'g'],
{b'h': "gid_8_and_9_data"},
[b'i', b'j', b'k', b'l'],
{b'm': "gid_13_data"},
[b'n']
};
let offset = buffer.offset_for("gid_2_data") as u32;
buffer.write_at("gid_2_offset", offset);
let offset = buffer.offset_for("gid_7_data") as u32;
buffer.write_at("gid_7_offset", offset);
let offset = buffer.offset_for("gid_8_and_9_data") as u32;
buffer.write_at("gid_8_offset", offset);
let offset = buffer.offset_for("gid_8_and_9_data") as u32;
buffer.write_at("gid_9_offset", offset);
let offset = buffer.offset_for("gid_13_data") as u32;
buffer.write_at("gid_13_offset", offset);
buffer.write_at("end_offset", offset + 2);
buffer
}
// Format specification: https://w3c.github.io/IFT/Overview.html#glyphpatches
pub fn glyf_u16_glyph_patches_2() -> BeBuffer {
let mut buffer = be_buffer! {
3u32, // glyph count
{1u8: "table_count"}, // table count
// glyph ids * 3
7u16,
12u16,
14u16,
(Tag::new(b"glyf")), // tables * 1
// glyph data offsets * 6
{0u32: "gid_7_offset"},
{0u32: "gid_12_offset"},
{0u32: "gid_14_offset"},
{0u32: "end_offset"},
// data blocks
{b'q': "gid_7_data"},
[b'r'],
{b's': "gid_12_data"},
[b't', b'u'],
{b'v': "gid_14_data"}
};
let offset = buffer.offset_for("gid_7_data") as u32;
buffer.write_at("gid_7_offset", offset);
let offset = buffer.offset_for("gid_12_data") as u32;
buffer.write_at("gid_12_offset", offset);
let offset = buffer.offset_for("gid_14_data") as u32;
buffer.write_at("gid_14_offset", offset);
buffer.write_at("end_offset", offset + 1);
buffer
}
// Format specification: https://w3c.github.io/IFT/Overview.html#glyphpatches
pub fn glyf_u24_glyph_patches() -> BeBuffer {
let mut buffer = be_buffer! {
5u32, // glyph count
1u8, // table count
(Uint24::new(2)), (Uint24::new(7)), (Uint24::new(8)), (Uint24::new(9)), (Uint24::new(13)), // glyph ids * 5
(Tag::new(b"glyf")), // tables * 1
// glyph data offsets * 6
{0u32: "gid_2_offset"},
{0u32: "gid_7_offset"},
{0u32: "gid_8_offset"},
{0u32: "gid_9_offset"},
{0u32: "gid_13_offset"},
{0u32: "end_offset"},
// data blocks
{b'a': "gid_2_data"},
[b'b', b'c'],
{b'd': "gid_7_data"},
[b'e', b'f', b'g'],
{b'h': "gid_8_and_9_data"},
[b'i', b'j', b'k', b'l'],
{b'm': "gid_13_data"},
[b'n']
};
let offset = buffer.offset_for("gid_2_data") as u32;
buffer.write_at("gid_2_offset", offset);
let offset = buffer.offset_for("gid_7_data") as u32;
buffer.write_at("gid_7_offset", offset);
let offset = buffer.offset_for("gid_8_and_9_data") as u32;
buffer.write_at("gid_8_offset", offset);
let offset = buffer.offset_for("gid_8_and_9_data") as u32;
buffer.write_at("gid_9_offset", offset);
let offset = buffer.offset_for("gid_13_data") as u32;
buffer.write_at("gid_13_offset", offset);
buffer.write_at("end_offset", offset + 2);
buffer
}
// Format specification: https://w3c.github.io/IFT/Overview.html#glyphpatches
pub fn glyf_and_gvar_u16_glyph_patches() -> BeBuffer {
let mut buffer = be_buffer! {
3u32, // glyph count
2u8, // table count
[2, 7, 8u16], // glyph ids * 3
(Tag::new(b"glyf")), // tables[0]
{(Tag::new(b"gvar")): "gvar_tag"}, // tables[1]
// glyph data offsets * 7
{0u32: "glyf_gid_2_offset"},
{0u32: "glyf_gid_7_offset"},
{0u32: "glyf_gid_8_offset"},
{0u32: "gvar_gid_2_offset"},
{0u32: "gvar_gid_7_offset"},
{0u32: "gvar_gid_8_offset"},
{0u32: "end_offset"},
// data blocks
{b'a': "glyf_gid_2_data"},
[b'b', b'c'],
{b'd': "glyf_gid_7_data"},
[b'e', b'f', b'g'],
{b'h': "glyf_gid_8_data"},
[b'i', b'j', b'k', b'l'],
{b'm': "gvar_gid_2_data"},
[b'n'],
{b'o': "gvar_gid_7_data"},
[b'p', b'q'],
{b'r': "gvar_gid_8_data"}
};
let offset = buffer.offset_for("glyf_gid_2_data") as u32;
buffer.write_at("glyf_gid_2_offset", offset);
let offset = buffer.offset_for("glyf_gid_7_data") as u32;
buffer.write_at("glyf_gid_7_offset", offset);
let offset = buffer.offset_for("glyf_gid_8_data") as u32;
buffer.write_at("glyf_gid_8_offset", offset);
let offset = buffer.offset_for("gvar_gid_2_data") as u32;
buffer.write_at("gvar_gid_2_offset", offset);
let offset = buffer.offset_for("gvar_gid_7_data") as u32;
buffer.write_at("gvar_gid_7_offset", offset);
let offset = buffer.offset_for("gvar_gid_8_data") as u32;
buffer.write_at("gvar_gid_8_offset", offset);
buffer.write_at("end_offset", offset + 1);
buffer
}