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LibGfx: Add structs for OpenType offset table

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Sam Atkins 2023-10-22 13:46:41 +01:00 • committed by Andreas Kling
parent e7fe377501
commit d80c528eb4
1 changed files with 21 additions and 0 deletions
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21
Userland/Libraries/LibGfx/Font/OpenType/Tables.h
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@ -2,6 +2,7 @@
* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
* Copyright (c) 2023, Lukas Affolter <git@lukasach.dev>
* Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -42,6 +43,26 @@ using Tag = BigEndian<u32>;
using Offset16 = BigEndian<u16>;
using Offset32 = BigEndian<u32>;
// https://learn.microsoft.com/en-us/typography/opentype/spec/otff#table-directory
// Table Directory (known as the Offset Table in ISO-IEC 14496-22:2019)
struct [[gnu::packed]] TableDirectory {
BigEndian<u32> sfnt_version;
BigEndian<u16> num_tables; // Number of tables.
BigEndian<u16> search_range; // (Maximum power of 2 <= numTables) x 16.
BigEndian<u16> entry_selector; // Log2(maximum power of 2 <= numTables).
BigEndian<u16> range_shift; // NumTables x 16 - searchRange.
};
static_assert(AssertSize<TableDirectory, 12>());
// https://learn.microsoft.com/en-us/typography/opentype/spec/otff#table-directory
struct [[gnu::packed]] TableRecord {
Tag table_tag; // Table identifier.
BigEndian<u32> checksum; // CheckSum for this table.
Offset32 offset; // Offset from beginning of TrueType font file.
BigEndian<u32> length; // Length of this table.
};
static_assert(AssertSize<TableRecord, 16>());
// https://learn.microsoft.com/en-us/typography/opentype/spec/head
// head: Font Header Table
class Head {