mirror of
https://github.com/RGBCube/serenity
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a552c3bc8c
Some fonts tend to have multiple naming tables, namely MS-Gothic has 3 tables: [macintosh, ja], [windows, en-us], [windows, ja].
176 lines
3.6 KiB
C++
176 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Span.h>
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namespace TTF {
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enum class IndexToLocFormat {
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Offset16,
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Offset32,
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};
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class Head {
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public:
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static Optional<Head> from_slice(const ReadonlyBytes&);
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u16 units_per_em() const;
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i16 xmin() const;
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i16 ymin() const;
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i16 xmax() const;
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i16 ymax() const;
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u16 lowest_recommended_ppem() const;
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IndexToLocFormat index_to_loc_format() const;
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private:
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enum class Offsets {
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UnitsPerEM = 18,
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XMin = 36,
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YMin = 38,
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XMax = 40,
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YMax = 42,
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LowestRecPPEM = 46,
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IndexToLocFormat = 50,
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};
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enum class Sizes {
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Table = 54,
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};
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Head(const ReadonlyBytes& slice)
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: m_slice(slice)
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{
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}
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ReadonlyBytes m_slice;
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};
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class Hhea {
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public:
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static Optional<Hhea> from_slice(const ReadonlyBytes&);
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i16 ascender() const;
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i16 descender() const;
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i16 line_gap() const;
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u16 advance_width_max() const;
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u16 number_of_h_metrics() const;
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private:
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enum class Offsets {
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Ascender = 4,
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Descender = 6,
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LineGap = 8,
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AdvanceWidthMax = 10,
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NumberOfHMetrics = 34,
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};
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enum class Sizes {
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Table = 36,
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};
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Hhea(const ReadonlyBytes& slice)
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: m_slice(slice)
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{
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}
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ReadonlyBytes m_slice;
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};
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class Maxp {
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public:
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static Optional<Maxp> from_slice(const ReadonlyBytes&);
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u16 num_glyphs() const;
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private:
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enum class Offsets {
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NumGlyphs = 4
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};
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enum class Sizes {
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TableV0p5 = 6,
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};
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Maxp(const ReadonlyBytes& slice)
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: m_slice(slice)
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{
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}
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ReadonlyBytes m_slice;
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};
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struct GlyphHorizontalMetrics {
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u16 advance_width;
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i16 left_side_bearing;
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};
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class Hmtx {
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public:
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static Optional<Hmtx> from_slice(const ReadonlyBytes&, u32 num_glyphs, u32 number_of_h_metrics);
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GlyphHorizontalMetrics get_glyph_horizontal_metrics(u32 glyph_id) const;
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private:
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enum class Sizes {
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LongHorMetric = 4,
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LeftSideBearing = 2
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};
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Hmtx(const ReadonlyBytes& slice, u32 num_glyphs, u32 number_of_h_metrics)
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: m_slice(slice)
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, m_num_glyphs(num_glyphs)
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, m_number_of_h_metrics(number_of_h_metrics)
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{
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}
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ReadonlyBytes m_slice;
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u32 m_num_glyphs { 0 };
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u32 m_number_of_h_metrics { 0 };
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};
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class Name {
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public:
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enum class Platform {
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Unicode = 0,
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Macintosh = 1,
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Windows = 3,
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};
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enum class MacintoshLanguage {
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English = 0,
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};
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enum class WindowsLanguage {
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EnglishUnitedStates = 0x0409,
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};
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static Optional<Name> from_slice(const ReadonlyBytes&);
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String family_name() const { return string_for_id(NameId::FamilyName); }
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String subfamily_name() const { return string_for_id(NameId::SubfamilyName); }
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String typographic_family_name() const { return string_for_id(NameId::TypographicFamilyName); }
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String typographic_subfamily_name() const { return string_for_id(NameId::TypographicSubfamilyName); }
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private:
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enum class NameId {
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Copyright = 0,
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FamilyName = 1,
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SubfamilyName = 2,
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UniqueIdentifier = 3,
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FullName = 4,
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VersionString = 5,
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PostscriptName = 6,
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Trademark = 7,
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Manufacturer = 8,
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Designer = 9,
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Description = 10,
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TypographicFamilyName = 16,
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TypographicSubfamilyName = 17,
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};
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Name(const ReadonlyBytes& slice)
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: m_slice(slice)
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{
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}
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String string_for_id(NameId id) const;
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ReadonlyBytes m_slice;
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};
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}
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