/* * Copyright (c) 2020, Srimanta Barua * * SPDX-License-Identifier: BSD-2-Clause */ #pragma once #include namespace TTF { enum class IndexToLocFormat { Offset16, Offset32, }; class Head { public: static Optional from_slice(ReadonlyBytes const&); u16 units_per_em() const; i16 xmin() const; i16 ymin() const; i16 xmax() const; i16 ymax() const; u16 lowest_recommended_ppem() const; IndexToLocFormat index_to_loc_format() const; private: enum class Offsets { UnitsPerEM = 18, XMin = 36, YMin = 38, XMax = 40, YMax = 42, LowestRecPPEM = 46, IndexToLocFormat = 50, }; enum class Sizes { Table = 54, }; Head(ReadonlyBytes const& slice) : m_slice(slice) { } ReadonlyBytes m_slice; }; class Hhea { public: static Optional from_slice(ReadonlyBytes const&); i16 ascender() const; i16 descender() const; i16 line_gap() const; u16 advance_width_max() const; u16 number_of_h_metrics() const; private: enum class Offsets { Ascender = 4, Descender = 6, LineGap = 8, AdvanceWidthMax = 10, NumberOfHMetrics = 34, }; enum class Sizes { Table = 36, }; Hhea(ReadonlyBytes const& slice) : m_slice(slice) { } ReadonlyBytes m_slice; }; class Maxp { public: static Optional from_slice(ReadonlyBytes const&); u16 num_glyphs() const; private: enum class Offsets { NumGlyphs = 4 }; enum class Sizes { TableV0p5 = 6, }; Maxp(ReadonlyBytes const& slice) : m_slice(slice) { } ReadonlyBytes m_slice; }; struct GlyphHorizontalMetrics { u16 advance_width; i16 left_side_bearing; }; class Hmtx { public: static Optional from_slice(ReadonlyBytes const&, u32 num_glyphs, u32 number_of_h_metrics); GlyphHorizontalMetrics get_glyph_horizontal_metrics(u32 glyph_id) const; private: enum class Sizes { LongHorMetric = 4, LeftSideBearing = 2 }; Hmtx(ReadonlyBytes const& slice, u32 num_glyphs, u32 number_of_h_metrics) : m_slice(slice) , m_num_glyphs(num_glyphs) , m_number_of_h_metrics(number_of_h_metrics) { } ReadonlyBytes m_slice; u32 m_num_glyphs { 0 }; u32 m_number_of_h_metrics { 0 }; }; class OS2 { public: enum class Offsets { TypographicAscender = 68, TypographicDescender = 70, TypographicLineGap = 72, }; i16 typographic_ascender() const; i16 typographic_descender() const; i16 typographic_line_gap() const; explicit OS2(ReadonlyBytes const& slice) : m_slice(slice) { } private: ReadonlyBytes m_slice; }; class Name { public: enum class Platform { Unicode = 0, Macintosh = 1, Windows = 3, }; enum class MacintoshLanguage { English = 0, }; enum class WindowsLanguage { EnglishUnitedStates = 0x0409, }; static Optional from_slice(ReadonlyBytes const&); String family_name() const { return string_for_id(NameId::FamilyName); } String subfamily_name() const { return string_for_id(NameId::SubfamilyName); } String typographic_family_name() const { return string_for_id(NameId::TypographicFamilyName); } String typographic_subfamily_name() const { return string_for_id(NameId::TypographicSubfamilyName); } private: enum class NameId { Copyright = 0, FamilyName = 1, SubfamilyName = 2, UniqueIdentifier = 3, FullName = 4, VersionString = 5, PostscriptName = 6, Trademark = 7, Manufacturer = 8, Designer = 9, Description = 10, TypographicFamilyName = 16, TypographicSubfamilyName = 17, }; Name(ReadonlyBytes const& slice) : m_slice(slice) { } String string_for_id(NameId id) const; ReadonlyBytes m_slice; }; }