mirror of
https://github.com/RGBCube/serenity
synced 2025-07-27 01:37:36 +00:00
LibGfx: Move TTF files from TrueTypeFont/ to Font/TrueType/
This commit is contained in:
parent
e84bbfed44
commit
6f8fd91f22
15 changed files with 36 additions and 36 deletions
158
Userland/Libraries/LibGfx/Font/TrueType/Cmap.cpp
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158
Userland/Libraries/LibGfx/Font/TrueType/Cmap.cpp
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/*
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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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#include <AK/Optional.h>
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#include <LibGfx/Font/TrueType/Cmap.h>
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namespace TTF {
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extern u16 be_u16(u8 const*);
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extern u32 be_u32(u8 const*);
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extern i16 be_i16(u8 const*);
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Optional<Cmap::Subtable::Platform> Cmap::Subtable::platform_id() const
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{
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switch (m_raw_platform_id) {
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case 0:
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return Platform::Unicode;
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case 1:
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return Platform::Macintosh;
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case 3:
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return Platform::Windows;
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case 4:
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return Platform::Custom;
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default:
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return {};
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}
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}
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Cmap::Subtable::Format Cmap::Subtable::format() const
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{
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switch (be_u16(m_slice.offset_pointer(0))) {
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case 0:
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return Format::ByteEncoding;
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case 2:
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return Format::HighByte;
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case 4:
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return Format::SegmentToDelta;
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case 6:
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return Format::TrimmedTable;
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case 8:
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return Format::Mixed16And32;
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case 10:
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return Format::TrimmedArray;
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case 12:
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return Format::SegmentedCoverage;
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case 13:
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return Format::ManyToOneRange;
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case 14:
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return Format::UnicodeVariationSequences;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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u32 Cmap::num_subtables() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::NumTables));
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}
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Optional<Cmap::Subtable> Cmap::subtable(u32 index) const
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{
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if (index >= num_subtables()) {
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return {};
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}
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u32 record_offset = (u32)Sizes::TableHeader + index * (u32)Sizes::EncodingRecord;
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u16 platform_id = be_u16(m_slice.offset_pointer(record_offset));
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u16 encoding_id = be_u16(m_slice.offset_pointer(record_offset + (u32)Offsets::EncodingRecord_EncodingID));
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u32 subtable_offset = be_u32(m_slice.offset_pointer(record_offset + (u32)Offsets::EncodingRecord_Offset));
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if (subtable_offset >= m_slice.size())
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return {};
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auto subtable_slice = ReadonlyBytes(m_slice.offset_pointer(subtable_offset), m_slice.size() - subtable_offset);
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return Subtable(subtable_slice, platform_id, encoding_id);
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}
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// FIXME: This only handles formats 4 (SegmentToDelta) and 12 (SegmentedCoverage) for now.
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u32 Cmap::Subtable::glyph_id_for_code_point(u32 code_point) const
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{
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switch (format()) {
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case Format::SegmentToDelta:
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return glyph_id_for_code_point_table_4(code_point);
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case Format::SegmentedCoverage:
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return glyph_id_for_code_point_table_12(code_point);
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default:
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return 0;
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}
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}
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u32 Cmap::Subtable::glyph_id_for_code_point_table_4(u32 code_point) const
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{
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u32 segcount_x2 = be_u16(m_slice.offset_pointer((u32)Table4Offsets::SegCountX2));
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if (m_slice.size() < segcount_x2 * (u32)Table4Sizes::NonConstMultiplier + (u32)Table4Sizes::Constant)
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return 0;
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u32 segcount = segcount_x2 / 2;
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u32 l = 0, r = segcount - 1;
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while (l < r) {
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u32 mid = l + (r - l) / 2;
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u32 end_code_point_at_mid = be_u16(m_slice.offset_pointer((u32)Table4Offsets::EndConstBase + (mid * 2)));
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if (code_point <= end_code_point_at_mid)
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r = mid;
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else
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l = mid + 1;
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}
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u32 offset = l * 2;
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u32 start_code_point = be_u16(m_slice.offset_pointer((u32)Table4Offsets::StartConstBase + segcount_x2 + offset));
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if (start_code_point > code_point)
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return 0;
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u32 delta = be_u16(m_slice.offset_pointer((u32)Table4Offsets::DeltaConstBase + segcount_x2 * 2 + offset));
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u32 range = be_u16(m_slice.offset_pointer((u32)Table4Offsets::RangeConstBase + segcount_x2 * 3 + offset));
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if (range == 0)
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return (code_point + delta) & 0xffff;
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u32 glyph_offset = (u32)Table4Offsets::GlyphOffsetConstBase + segcount_x2 * 3 + offset + range + (code_point - start_code_point) * 2;
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VERIFY(glyph_offset + 2 <= m_slice.size());
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return (be_u16(m_slice.offset_pointer(glyph_offset)) + delta) & 0xffff;
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}
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u32 Cmap::Subtable::glyph_id_for_code_point_table_12(u32 code_point) const
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{
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u32 num_groups = be_u32(m_slice.offset_pointer((u32)Table12Offsets::NumGroups));
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VERIFY(m_slice.size() >= (u32)Table12Sizes::Header + (u32)Table12Sizes::Record * num_groups);
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for (u32 offset = 0; offset < num_groups * (u32)Table12Sizes::Record; offset += (u32)Table12Sizes::Record) {
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u32 start_code_point = be_u32(m_slice.offset_pointer((u32)Table12Offsets::Record_StartCode + offset));
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if (code_point < start_code_point)
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break;
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u32 end_code_point = be_u32(m_slice.offset_pointer((u32)Table12Offsets::Record_EndCode + offset));
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if (code_point > end_code_point)
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continue;
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u32 glyph_offset = be_u32(m_slice.offset_pointer((u32)Table12Offsets::Record_StartGlyph + offset));
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return code_point - start_code_point + glyph_offset;
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}
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return 0;
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}
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u32 Cmap::glyph_id_for_code_point(u32 code_point) const
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{
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auto opt_subtable = subtable(m_active_index);
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if (!opt_subtable.has_value())
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return 0;
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auto subtable = opt_subtable.value();
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return subtable.glyph_id_for_code_point(code_point);
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}
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Optional<Cmap> Cmap::from_slice(ReadonlyBytes slice)
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{
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if (slice.size() < (size_t)Sizes::TableHeader)
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return {};
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return Cmap(slice);
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}
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}
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111
Userland/Libraries/LibGfx/Font/TrueType/Cmap.h
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111
Userland/Libraries/LibGfx/Font/TrueType/Cmap.h
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/*
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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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#include <stdint.h>
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namespace TTF {
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class Cmap {
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public:
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class Subtable {
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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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Custom = 4,
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};
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enum class Format {
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ByteEncoding = 0,
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HighByte = 2,
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SegmentToDelta = 4,
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TrimmedTable = 6,
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Mixed16And32 = 8,
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TrimmedArray = 10,
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SegmentedCoverage = 12,
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ManyToOneRange = 13,
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UnicodeVariationSequences = 14,
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};
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enum class WindowsEncoding {
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UnicodeBMP = 1,
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UnicodeFullRepertoire = 10,
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};
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Subtable(ReadonlyBytes slice, u16 platform_id, u16 encoding_id)
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: m_slice(slice)
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, m_raw_platform_id(platform_id)
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, m_encoding_id(encoding_id)
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{
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}
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// Returns 0 if glyph not found. This corresponds to the "missing glyph"
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u32 glyph_id_for_code_point(u32 code_point) const;
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Optional<Platform> platform_id() const;
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u16 encoding_id() const { return m_encoding_id; }
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Format format() const;
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private:
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enum class Table4Offsets {
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SegCountX2 = 6,
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EndConstBase = 14,
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StartConstBase = 16,
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DeltaConstBase = 16,
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RangeConstBase = 16,
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GlyphOffsetConstBase = 16,
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};
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enum class Table4Sizes {
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Constant = 16,
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NonConstMultiplier = 4,
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};
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enum class Table12Offsets {
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NumGroups = 12,
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Record_StartCode = 16,
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Record_EndCode = 20,
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Record_StartGlyph = 24,
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};
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enum class Table12Sizes {
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Header = 16,
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Record = 12,
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};
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u32 glyph_id_for_code_point_table_4(u32 code_point) const;
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u32 glyph_id_for_code_point_table_12(u32 code_point) const;
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ReadonlyBytes m_slice;
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u16 m_raw_platform_id { 0 };
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u16 m_encoding_id { 0 };
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};
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static Optional<Cmap> from_slice(ReadonlyBytes);
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u32 num_subtables() const;
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Optional<Subtable> subtable(u32 index) const;
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void set_active_index(u32 index) { m_active_index = index; }
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// Returns 0 if glyph not found. This corresponds to the "missing glyph"
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u32 glyph_id_for_code_point(u32 code_point) const;
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private:
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enum class Offsets {
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NumTables = 2,
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EncodingRecord_EncodingID = 2,
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EncodingRecord_Offset = 4,
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};
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enum class Sizes {
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TableHeader = 4,
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EncodingRecord = 8,
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};
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Cmap(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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u32 m_active_index { UINT32_MAX };
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};
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}
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766
Userland/Libraries/LibGfx/Font/TrueType/Font.cpp
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766
Userland/Libraries/LibGfx/Font/TrueType/Font.cpp
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/*
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* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Checked.h>
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#include <AK/Try.h>
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#include <AK/Utf32View.h>
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#include <AK/Utf8View.h>
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#include <LibCore/MappedFile.h>
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#include <LibGfx/Font/TrueType/Cmap.h>
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#include <LibGfx/Font/TrueType/Font.h>
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#include <LibGfx/Font/TrueType/Glyf.h>
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#include <LibGfx/Font/TrueType/Tables.h>
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#include <LibTextCodec/Decoder.h>
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#include <math.h>
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#include <sys/mman.h>
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namespace TTF {
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u16 be_u16(u8 const*);
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u32 be_u32(u8 const*);
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i16 be_i16(u8 const*);
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float be_fword(u8 const*);
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u32 tag_from_str(char const*);
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u16 be_u16(u8 const* ptr)
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{
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return (((u16)ptr[0]) << 8) | ((u16)ptr[1]);
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}
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u32 be_u32(u8 const* ptr)
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{
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return (((u32)ptr[0]) << 24) | (((u32)ptr[1]) << 16) | (((u32)ptr[2]) << 8) | ((u32)ptr[3]);
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}
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i16 be_i16(u8 const* ptr)
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{
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return (((i16)ptr[0]) << 8) | ((i16)ptr[1]);
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}
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float be_fword(u8 const* ptr)
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{
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return (float)be_i16(ptr) / (float)(1 << 14);
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}
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u32 tag_from_str(char const* str)
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{
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return be_u32((u8 const*)str);
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}
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Optional<Head> Head::from_slice(ReadonlyBytes slice)
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{
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if (slice.size() < (size_t)Sizes::Table) {
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return {};
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}
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return Head(slice);
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}
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u16 Head::units_per_em() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::UnitsPerEM));
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}
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i16 Head::xmin() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::XMin));
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}
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i16 Head::ymin() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::YMin));
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}
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i16 Head::xmax() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::XMax));
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}
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i16 Head::ymax() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::YMax));
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}
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u16 Head::style() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::Style));
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}
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u16 Head::lowest_recommended_ppem() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::LowestRecPPEM));
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}
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IndexToLocFormat Head::index_to_loc_format() const
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{
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i16 raw = be_i16(m_slice.offset_pointer((u32)Offsets::IndexToLocFormat));
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switch (raw) {
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case 0:
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return IndexToLocFormat::Offset16;
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case 1:
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return IndexToLocFormat::Offset32;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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Optional<Hhea> Hhea::from_slice(ReadonlyBytes slice)
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{
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if (slice.size() < (size_t)Sizes::Table) {
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return {};
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}
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return Hhea(slice);
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}
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i16 Hhea::ascender() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::Ascender));
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}
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i16 Hhea::descender() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::Descender));
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}
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i16 Hhea::line_gap() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::LineGap));
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}
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u16 Hhea::advance_width_max() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::AdvanceWidthMax));
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}
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u16 Hhea::number_of_h_metrics() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::NumberOfHMetrics));
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}
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Optional<Maxp> Maxp::from_slice(ReadonlyBytes slice)
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{
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if (slice.size() < (size_t)Sizes::TableV0p5) {
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return {};
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}
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return Maxp(slice);
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}
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u16 Maxp::num_glyphs() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::NumGlyphs));
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}
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Optional<Hmtx> Hmtx::from_slice(ReadonlyBytes slice, u32 num_glyphs, u32 number_of_h_metrics)
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{
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if (slice.size() < number_of_h_metrics * (u32)Sizes::LongHorMetric + (num_glyphs - number_of_h_metrics) * (u32)Sizes::LeftSideBearing) {
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return {};
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}
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return Hmtx(slice, num_glyphs, number_of_h_metrics);
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}
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Optional<Name> Name::from_slice(ReadonlyBytes slice)
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{
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return Name(slice);
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}
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ErrorOr<Kern> Kern::from_slice(ReadonlyBytes slice)
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{
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if (slice.size() < sizeof(u32))
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return Error::from_string_literal("Invalid kern table header"sv);
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// We only support the old (2x u16) version of the header
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auto version = be_u16(slice.data());
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auto number_of_subtables = be_u16(slice.offset(sizeof(u16)));
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if (version != 0)
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return Error::from_string_literal("Unsupported kern table version"sv);
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if (number_of_subtables == 0)
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return Error::from_string_literal("Kern table does not contain any subtables"sv);
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// Read all subtable offsets
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auto subtable_offsets = TRY(FixedArray<size_t>::try_create(number_of_subtables));
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size_t offset = 2 * sizeof(u16);
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for (size_t i = 0; i < number_of_subtables; ++i) {
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if (slice.size() < offset + Sizes::SubtableHeader)
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return Error::from_string_literal("Invalid kern subtable header"sv);
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|
||||
subtable_offsets[i] = offset;
|
||||
auto subtable_size = be_u16(slice.offset(offset + sizeof(u16)));
|
||||
offset += subtable_size;
|
||||
}
|
||||
|
||||
return Kern(slice, move(subtable_offsets));
|
||||
}
|
||||
|
||||
i16 Kern::get_glyph_kerning(u16 left_glyph_id, u16 right_glyph_id) const
|
||||
{
|
||||
VERIFY(left_glyph_id > 0 && right_glyph_id > 0);
|
||||
|
||||
i16 glyph_kerning = 0;
|
||||
for (auto subtable_offset : m_subtable_offsets) {
|
||||
auto subtable_slice = m_slice.slice(subtable_offset);
|
||||
|
||||
auto version = be_u16(subtable_slice.data());
|
||||
auto length = be_u16(subtable_slice.offset(sizeof(u16)));
|
||||
auto coverage = be_u16(subtable_slice.offset(2 * sizeof(u16)));
|
||||
|
||||
if (version != 0) {
|
||||
dbgln("TTF::Kern: unsupported subtable version {}", version);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (subtable_slice.size() < length) {
|
||||
dbgln("TTF::Kern: subtable has an invalid size {}", length);
|
||||
continue;
|
||||
}
|
||||
|
||||
auto is_horizontal = (coverage & (1 << 0)) > 0;
|
||||
auto is_minimum = (coverage & (1 << 1)) > 0;
|
||||
auto is_cross_stream = (coverage & (1 << 2)) > 0;
|
||||
auto is_override = (coverage & (1 << 3)) > 0;
|
||||
auto reserved_bits = (coverage & 0xF0);
|
||||
auto format = (coverage & 0xFF00) >> 8;
|
||||
|
||||
// FIXME: implement support for these features
|
||||
if (!is_horizontal || is_minimum || is_cross_stream || (reserved_bits > 0)) {
|
||||
dbgln("TTF::Kern: FIXME: implement missing feature support for subtable");
|
||||
continue;
|
||||
}
|
||||
|
||||
// FIXME: implement support for subtable formats other than 0
|
||||
Optional<i16> subtable_kerning;
|
||||
switch (format) {
|
||||
case 0:
|
||||
subtable_kerning = read_glyph_kerning_format0(subtable_slice.slice(Sizes::SubtableHeader), left_glyph_id, right_glyph_id);
|
||||
break;
|
||||
default:
|
||||
dbgln("TTF::Kern: FIXME: subtable format {} is unsupported", format);
|
||||
continue;
|
||||
}
|
||||
if (!subtable_kerning.has_value())
|
||||
continue;
|
||||
auto kerning_value = subtable_kerning.release_value();
|
||||
|
||||
if (is_override)
|
||||
glyph_kerning = kerning_value;
|
||||
else
|
||||
glyph_kerning += kerning_value;
|
||||
}
|
||||
return glyph_kerning;
|
||||
}
|
||||
|
||||
Optional<i16> Kern::read_glyph_kerning_format0(ReadonlyBytes slice, u16 left_glyph_id, u16 right_glyph_id)
|
||||
{
|
||||
if (slice.size() < 4 * sizeof(u16))
|
||||
return {};
|
||||
|
||||
u16 number_of_pairs = be_u16(slice.data());
|
||||
u16 search_range = be_u16(slice.offset_pointer(sizeof(u16)));
|
||||
u16 entry_selector = be_u16(slice.offset_pointer(2 * sizeof(u16)));
|
||||
u16 range_shift = be_u16(slice.offset_pointer(3 * sizeof(u16)));
|
||||
|
||||
// Sanity checks for this table format
|
||||
auto pairs_in_search_range = search_range / Sizes::Format0Entry;
|
||||
if (number_of_pairs == 0)
|
||||
return {};
|
||||
if (pairs_in_search_range > number_of_pairs)
|
||||
return {};
|
||||
if ((1 << entry_selector) * Sizes::Format0Entry != search_range)
|
||||
return {};
|
||||
if ((number_of_pairs - pairs_in_search_range) * Sizes::Format0Entry != range_shift)
|
||||
return {};
|
||||
|
||||
// FIXME: implement a possibly slightly more efficient binary search using the parameters above
|
||||
auto search_slice = slice.slice(4 * sizeof(u16));
|
||||
size_t left_idx = 0;
|
||||
size_t right_idx = number_of_pairs - 1;
|
||||
for (auto i = 0; i < 16; ++i) {
|
||||
size_t pivot_idx = (left_idx + right_idx) / 2;
|
||||
|
||||
u16 pivot_left_glyph_id = be_u16(search_slice.offset(pivot_idx * Sizes::Format0Entry + 0));
|
||||
u16 pivot_right_glyph_id = be_u16(search_slice.offset(pivot_idx * Sizes::Format0Entry + 2));
|
||||
|
||||
// Match
|
||||
if (pivot_left_glyph_id == left_glyph_id && pivot_right_glyph_id == right_glyph_id)
|
||||
return be_i16(search_slice.offset(pivot_idx * Sizes::Format0Entry + 4));
|
||||
|
||||
// Narrow search area
|
||||
if (pivot_left_glyph_id < left_glyph_id || (pivot_left_glyph_id == left_glyph_id && pivot_right_glyph_id < right_glyph_id))
|
||||
left_idx = pivot_idx + 1;
|
||||
else if (pivot_idx == left_idx)
|
||||
break;
|
||||
else
|
||||
right_idx = pivot_idx - 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
String Name::string_for_id(NameId id) const
|
||||
{
|
||||
auto num_entries = be_u16(m_slice.offset_pointer(2));
|
||||
auto string_offset = be_u16(m_slice.offset_pointer(4));
|
||||
|
||||
Vector<int> valid_ids;
|
||||
|
||||
for (int i = 0; i < num_entries; ++i) {
|
||||
auto this_id = be_u16(m_slice.offset_pointer(6 + i * 12 + 6));
|
||||
if (this_id == (u16)id)
|
||||
valid_ids.append(i);
|
||||
}
|
||||
|
||||
if (valid_ids.is_empty())
|
||||
return String::empty();
|
||||
|
||||
auto it = valid_ids.find_if([this](auto const& i) {
|
||||
// check if font has naming table for en-US language id
|
||||
auto platform = be_u16(m_slice.offset_pointer(6 + i * 12 + 0));
|
||||
auto language_id = be_u16(m_slice.offset_pointer(6 + i * 12 + 4));
|
||||
return (platform == (u16)Platform::Macintosh && language_id == (u16)MacintoshLanguage::English)
|
||||
|| (platform == (u16)Platform::Windows && language_id == (u16)WindowsLanguage::EnglishUnitedStates);
|
||||
});
|
||||
auto i = it != valid_ids.end() ? *it : valid_ids.first();
|
||||
|
||||
auto platform = be_u16(m_slice.offset_pointer(6 + i * 12 + 0));
|
||||
auto length = be_u16(m_slice.offset_pointer(6 + i * 12 + 8));
|
||||
auto offset = be_u16(m_slice.offset_pointer(6 + i * 12 + 10));
|
||||
|
||||
if (platform == (u16)Platform::Windows) {
|
||||
static auto& decoder = *TextCodec::decoder_for("utf-16be");
|
||||
return decoder.to_utf8(StringView { (char const*)m_slice.offset_pointer(string_offset + offset), length });
|
||||
}
|
||||
|
||||
return String((char const*)m_slice.offset_pointer(string_offset + offset), length);
|
||||
}
|
||||
|
||||
GlyphHorizontalMetrics Hmtx::get_glyph_horizontal_metrics(u32 glyph_id) const
|
||||
{
|
||||
VERIFY(glyph_id < m_num_glyphs);
|
||||
if (glyph_id < m_number_of_h_metrics) {
|
||||
auto offset = glyph_id * (u32)Sizes::LongHorMetric;
|
||||
u16 advance_width = be_u16(m_slice.offset_pointer(offset));
|
||||
i16 left_side_bearing = be_i16(m_slice.offset_pointer(offset + 2));
|
||||
return GlyphHorizontalMetrics {
|
||||
.advance_width = advance_width,
|
||||
.left_side_bearing = left_side_bearing,
|
||||
};
|
||||
}
|
||||
auto offset = m_number_of_h_metrics * (u32)Sizes::LongHorMetric + (glyph_id - m_number_of_h_metrics) * (u32)Sizes::LeftSideBearing;
|
||||
u16 advance_width = be_u16(m_slice.offset_pointer((m_number_of_h_metrics - 1) * (u32)Sizes::LongHorMetric));
|
||||
i16 left_side_bearing = be_i16(m_slice.offset_pointer(offset));
|
||||
return GlyphHorizontalMetrics {
|
||||
.advance_width = advance_width,
|
||||
.left_side_bearing = left_side_bearing,
|
||||
};
|
||||
}
|
||||
|
||||
ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_file(String path, unsigned index)
|
||||
{
|
||||
auto file = TRY(Core::MappedFile::map(path));
|
||||
auto font = TRY(try_load_from_externally_owned_memory(file->bytes(), index));
|
||||
font->m_mapped_file = move(file);
|
||||
return font;
|
||||
}
|
||||
|
||||
ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_externally_owned_memory(ReadonlyBytes buffer, unsigned index)
|
||||
{
|
||||
if (buffer.size() < 4)
|
||||
return Error::from_string_literal("Font file too small"sv);
|
||||
|
||||
u32 tag = be_u32(buffer.data());
|
||||
if (tag == tag_from_str("ttcf")) {
|
||||
// It's a font collection
|
||||
if (buffer.size() < (u32)Sizes::TTCHeaderV1 + sizeof(u32) * (index + 1))
|
||||
return Error::from_string_literal("Font file too small"sv);
|
||||
|
||||
u32 offset = be_u32(buffer.offset_pointer((u32)Sizes::TTCHeaderV1 + sizeof(u32) * index));
|
||||
return try_load_from_offset(buffer, offset);
|
||||
}
|
||||
if (tag == tag_from_str("OTTO"))
|
||||
return Error::from_string_literal("CFF fonts not supported yet"sv);
|
||||
|
||||
if (tag != 0x00010000)
|
||||
return Error::from_string_literal("Not a valid font"sv);
|
||||
|
||||
return try_load_from_offset(buffer, 0);
|
||||
}
|
||||
|
||||
// FIXME: "loca" and "glyf" are not available for CFF fonts.
|
||||
ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_offset(ReadonlyBytes buffer, u32 offset)
|
||||
{
|
||||
if (Checked<u32>::addition_would_overflow(offset, (u32)Sizes::OffsetTable))
|
||||
return Error::from_string_literal("Invalid offset in font header"sv);
|
||||
|
||||
if (buffer.size() < offset + (u32)Sizes::OffsetTable)
|
||||
return Error::from_string_literal("Font file too small"sv);
|
||||
|
||||
Optional<ReadonlyBytes> opt_head_slice = {};
|
||||
Optional<ReadonlyBytes> opt_name_slice = {};
|
||||
Optional<ReadonlyBytes> opt_hhea_slice = {};
|
||||
Optional<ReadonlyBytes> opt_maxp_slice = {};
|
||||
Optional<ReadonlyBytes> opt_hmtx_slice = {};
|
||||
Optional<ReadonlyBytes> opt_cmap_slice = {};
|
||||
Optional<ReadonlyBytes> opt_loca_slice = {};
|
||||
Optional<ReadonlyBytes> opt_glyf_slice = {};
|
||||
Optional<ReadonlyBytes> opt_os2_slice = {};
|
||||
Optional<ReadonlyBytes> opt_kern_slice = {};
|
||||
|
||||
Optional<Head> opt_head = {};
|
||||
Optional<Name> opt_name = {};
|
||||
Optional<Hhea> opt_hhea = {};
|
||||
Optional<Maxp> opt_maxp = {};
|
||||
Optional<Hmtx> opt_hmtx = {};
|
||||
Optional<Cmap> opt_cmap = {};
|
||||
Optional<Loca> opt_loca = {};
|
||||
Optional<OS2> opt_os2 = {};
|
||||
Optional<Kern> opt_kern = {};
|
||||
|
||||
auto num_tables = be_u16(buffer.offset_pointer(offset + (u32)Offsets::NumTables));
|
||||
if (buffer.size() < offset + (u32)Sizes::OffsetTable + num_tables * (u32)Sizes::TableRecord)
|
||||
return Error::from_string_literal("Font file too small"sv);
|
||||
|
||||
for (auto i = 0; i < num_tables; i++) {
|
||||
u32 record_offset = offset + (u32)Sizes::OffsetTable + i * (u32)Sizes::TableRecord;
|
||||
u32 tag = be_u32(buffer.offset_pointer(record_offset));
|
||||
u32 table_offset = be_u32(buffer.offset_pointer(record_offset + (u32)Offsets::TableRecord_Offset));
|
||||
u32 table_length = be_u32(buffer.offset_pointer(record_offset + (u32)Offsets::TableRecord_Length));
|
||||
|
||||
if (Checked<u32>::addition_would_overflow(table_offset, table_length))
|
||||
return Error::from_string_literal("Invalid table offset or length in font"sv);
|
||||
|
||||
if (buffer.size() < table_offset + table_length)
|
||||
return Error::from_string_literal("Font file too small"sv);
|
||||
|
||||
auto buffer_here = ReadonlyBytes(buffer.offset_pointer(table_offset), table_length);
|
||||
|
||||
// Get the table offsets we need.
|
||||
if (tag == tag_from_str("head")) {
|
||||
opt_head_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("name")) {
|
||||
opt_name_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("hhea")) {
|
||||
opt_hhea_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("maxp")) {
|
||||
opt_maxp_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("hmtx")) {
|
||||
opt_hmtx_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("cmap")) {
|
||||
opt_cmap_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("loca")) {
|
||||
opt_loca_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("glyf")) {
|
||||
opt_glyf_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("OS/2")) {
|
||||
opt_os2_slice = buffer_here;
|
||||
} else if (tag == tag_from_str("kern")) {
|
||||
opt_kern_slice = buffer_here;
|
||||
}
|
||||
}
|
||||
|
||||
if (!opt_head_slice.has_value() || !(opt_head = Head::from_slice(opt_head_slice.value())).has_value())
|
||||
return Error::from_string_literal("Could not load Head"sv);
|
||||
auto head = opt_head.value();
|
||||
|
||||
if (!opt_name_slice.has_value() || !(opt_name = Name::from_slice(opt_name_slice.value())).has_value())
|
||||
return Error::from_string_literal("Could not load Name"sv);
|
||||
auto name = opt_name.value();
|
||||
|
||||
if (!opt_hhea_slice.has_value() || !(opt_hhea = Hhea::from_slice(opt_hhea_slice.value())).has_value())
|
||||
return Error::from_string_literal("Could not load Hhea"sv);
|
||||
auto hhea = opt_hhea.value();
|
||||
|
||||
if (!opt_maxp_slice.has_value() || !(opt_maxp = Maxp::from_slice(opt_maxp_slice.value())).has_value())
|
||||
return Error::from_string_literal("Could not load Maxp"sv);
|
||||
auto maxp = opt_maxp.value();
|
||||
|
||||
if (!opt_hmtx_slice.has_value() || !(opt_hmtx = Hmtx::from_slice(opt_hmtx_slice.value(), maxp.num_glyphs(), hhea.number_of_h_metrics())).has_value())
|
||||
return Error::from_string_literal("Could not load Hmtx"sv);
|
||||
auto hmtx = opt_hmtx.value();
|
||||
|
||||
if (!opt_cmap_slice.has_value() || !(opt_cmap = Cmap::from_slice(opt_cmap_slice.value())).has_value())
|
||||
return Error::from_string_literal("Could not load Cmap"sv);
|
||||
auto cmap = opt_cmap.value();
|
||||
|
||||
if (!opt_loca_slice.has_value() || !(opt_loca = Loca::from_slice(opt_loca_slice.value(), maxp.num_glyphs(), head.index_to_loc_format())).has_value())
|
||||
return Error::from_string_literal("Could not load Loca"sv);
|
||||
auto loca = opt_loca.value();
|
||||
|
||||
if (!opt_glyf_slice.has_value())
|
||||
return Error::from_string_literal("Could not load Glyf"sv);
|
||||
auto glyf = Glyf(opt_glyf_slice.value());
|
||||
|
||||
if (!opt_os2_slice.has_value())
|
||||
return Error::from_string_literal("Could not load OS/2"sv);
|
||||
auto os2 = OS2(opt_os2_slice.value());
|
||||
|
||||
Optional<Kern> kern {};
|
||||
if (opt_kern_slice.has_value())
|
||||
kern = TRY(Kern::from_slice(opt_kern_slice.value()));
|
||||
|
||||
// Select cmap table. FIXME: Do this better. Right now, just looks for platform "Windows"
|
||||
// and corresponding encoding "Unicode full repertoire", or failing that, "Unicode BMP"
|
||||
for (u32 i = 0; i < cmap.num_subtables(); i++) {
|
||||
auto opt_subtable = cmap.subtable(i);
|
||||
if (!opt_subtable.has_value()) {
|
||||
continue;
|
||||
}
|
||||
auto subtable = opt_subtable.value();
|
||||
auto platform = subtable.platform_id();
|
||||
if (!platform.has_value())
|
||||
return Error::from_string_literal("Invalid Platform ID"sv);
|
||||
|
||||
if (platform.value() == Cmap::Subtable::Platform::Windows) {
|
||||
if (subtable.encoding_id() == (u16)Cmap::Subtable::WindowsEncoding::UnicodeFullRepertoire) {
|
||||
cmap.set_active_index(i);
|
||||
break;
|
||||
}
|
||||
if (subtable.encoding_id() == (u16)Cmap::Subtable::WindowsEncoding::UnicodeBMP) {
|
||||
cmap.set_active_index(i);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return adopt_ref(*new Font(move(buffer), move(head), move(name), move(hhea), move(maxp), move(hmtx), move(cmap), move(loca), move(glyf), move(os2), move(kern)));
|
||||
}
|
||||
|
||||
ScaledFontMetrics Font::metrics([[maybe_unused]] float x_scale, float y_scale) const
|
||||
{
|
||||
auto ascender = m_hhea.ascender() * y_scale;
|
||||
auto descender = m_hhea.descender() * y_scale;
|
||||
auto line_gap = m_hhea.line_gap() * y_scale;
|
||||
|
||||
return ScaledFontMetrics {
|
||||
.ascender = ascender,
|
||||
.descender = descender,
|
||||
.line_gap = line_gap,
|
||||
};
|
||||
}
|
||||
|
||||
// FIXME: "loca" and "glyf" are not available for CFF fonts.
|
||||
ScaledGlyphMetrics Font::glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const
|
||||
{
|
||||
if (glyph_id >= glyph_count()) {
|
||||
glyph_id = 0;
|
||||
}
|
||||
auto horizontal_metrics = m_hmtx.get_glyph_horizontal_metrics(glyph_id);
|
||||
auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
|
||||
auto glyph = m_glyf.glyph(glyph_offset);
|
||||
int ascender = glyph.ascender();
|
||||
int descender = glyph.descender();
|
||||
return ScaledGlyphMetrics {
|
||||
.ascender = (int)roundf(ascender * y_scale),
|
||||
.descender = (int)roundf(descender * y_scale),
|
||||
.advance_width = (int)roundf(horizontal_metrics.advance_width * x_scale),
|
||||
.left_side_bearing = (int)roundf(horizontal_metrics.left_side_bearing * x_scale),
|
||||
};
|
||||
}
|
||||
|
||||
float Font::glyphs_horizontal_kerning(u32 left_glyph_id, u32 right_glyph_id, float x_scale) const
|
||||
{
|
||||
if (!m_kern.has_value())
|
||||
return 0.f;
|
||||
return m_kern->get_glyph_kerning(left_glyph_id, right_glyph_id) * x_scale;
|
||||
}
|
||||
|
||||
// FIXME: "loca" and "glyf" are not available for CFF fonts.
|
||||
RefPtr<Gfx::Bitmap> Font::rasterize_glyph(u32 glyph_id, float x_scale, float y_scale) const
|
||||
{
|
||||
if (glyph_id >= glyph_count()) {
|
||||
glyph_id = 0;
|
||||
}
|
||||
auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
|
||||
auto glyph = m_glyf.glyph(glyph_offset);
|
||||
return glyph.rasterize(m_hhea.ascender(), m_hhea.descender(), x_scale, y_scale, [&](u16 glyph_id) {
|
||||
if (glyph_id >= glyph_count()) {
|
||||
glyph_id = 0;
|
||||
}
|
||||
auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
|
||||
return m_glyf.glyph(glyph_offset);
|
||||
});
|
||||
}
|
||||
|
||||
u32 Font::glyph_count() const
|
||||
{
|
||||
return m_maxp.num_glyphs();
|
||||
}
|
||||
|
||||
u16 Font::units_per_em() const
|
||||
{
|
||||
return m_head.units_per_em();
|
||||
}
|
||||
|
||||
String Font::family() const
|
||||
{
|
||||
auto string = m_name.typographic_family_name();
|
||||
if (!string.is_empty())
|
||||
return string;
|
||||
return m_name.family_name();
|
||||
}
|
||||
|
||||
String Font::variant() const
|
||||
{
|
||||
auto string = m_name.typographic_subfamily_name();
|
||||
if (!string.is_empty())
|
||||
return string;
|
||||
return m_name.subfamily_name();
|
||||
}
|
||||
|
||||
u16 Font::weight() const
|
||||
{
|
||||
constexpr u16 bold_bit { 1 };
|
||||
if (m_os2.weight_class())
|
||||
return m_os2.weight_class();
|
||||
if (m_head.style() & bold_bit)
|
||||
return 700;
|
||||
|
||||
return 400;
|
||||
}
|
||||
|
||||
u8 Font::slope() const
|
||||
{
|
||||
// https://docs.microsoft.com/en-us/typography/opentype/spec/os2
|
||||
constexpr u16 italic_selection_bit { 1 };
|
||||
constexpr u16 oblique_selection_bit { 512 };
|
||||
// https://docs.microsoft.com/en-us/typography/opentype/spec/head
|
||||
constexpr u16 italic_style_bit { 2 };
|
||||
|
||||
if (m_os2.selection() & oblique_selection_bit)
|
||||
return 2;
|
||||
if (m_os2.selection() & italic_selection_bit)
|
||||
return 1;
|
||||
if (m_head.style() & italic_style_bit)
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
bool Font::is_fixed_width() const
|
||||
{
|
||||
// FIXME: Read this information from the font file itself.
|
||||
// FIXME: Although, it appears some application do similar hacks
|
||||
return glyph_metrics(glyph_id_for_code_point('.'), 1, 1).advance_width == glyph_metrics(glyph_id_for_code_point('X'), 1, 1).advance_width;
|
||||
}
|
||||
|
||||
int ScaledFont::width(StringView view) const { return unicode_view_width(Utf8View(view)); }
|
||||
int ScaledFont::width(Utf8View const& view) const { return unicode_view_width(view); }
|
||||
int ScaledFont::width(Utf32View const& view) const { return unicode_view_width(view); }
|
||||
|
||||
template<typename T>
|
||||
ALWAYS_INLINE int ScaledFont::unicode_view_width(T const& view) const
|
||||
{
|
||||
if (view.is_empty())
|
||||
return 0;
|
||||
int width = 0;
|
||||
int longest_width = 0;
|
||||
u32 last_code_point = 0;
|
||||
for (auto code_point : view) {
|
||||
if (code_point == '\n' || code_point == '\r') {
|
||||
longest_width = max(width, longest_width);
|
||||
width = 0;
|
||||
last_code_point = code_point;
|
||||
continue;
|
||||
}
|
||||
u32 glyph_id = glyph_id_for_code_point(code_point);
|
||||
auto kerning = glyphs_horizontal_kerning(last_code_point, code_point);
|
||||
width += kerning + glyph_metrics(glyph_id).advance_width;
|
||||
last_code_point = code_point;
|
||||
}
|
||||
longest_width = max(width, longest_width);
|
||||
return longest_width;
|
||||
}
|
||||
|
||||
RefPtr<Gfx::Bitmap> ScaledFont::rasterize_glyph(u32 glyph_id) const
|
||||
{
|
||||
auto glyph_iterator = m_cached_glyph_bitmaps.find(glyph_id);
|
||||
if (glyph_iterator != m_cached_glyph_bitmaps.end())
|
||||
return glyph_iterator->value;
|
||||
|
||||
auto glyph_bitmap = m_font->rasterize_glyph(glyph_id, m_x_scale, m_y_scale);
|
||||
m_cached_glyph_bitmaps.set(glyph_id, glyph_bitmap);
|
||||
return glyph_bitmap;
|
||||
}
|
||||
|
||||
Gfx::Glyph ScaledFont::glyph(u32 code_point) const
|
||||
{
|
||||
auto id = glyph_id_for_code_point(code_point);
|
||||
auto bitmap = rasterize_glyph(id);
|
||||
auto metrics = glyph_metrics(id);
|
||||
return Gfx::Glyph(bitmap, metrics.left_side_bearing, metrics.advance_width, metrics.ascender);
|
||||
}
|
||||
|
||||
u8 ScaledFont::glyph_width(u32 code_point) const
|
||||
{
|
||||
auto id = glyph_id_for_code_point(code_point);
|
||||
auto metrics = glyph_metrics(id);
|
||||
return metrics.advance_width;
|
||||
}
|
||||
|
||||
int ScaledFont::glyph_or_emoji_width(u32 code_point) const
|
||||
{
|
||||
auto id = glyph_id_for_code_point(code_point);
|
||||
auto metrics = glyph_metrics(id);
|
||||
return metrics.advance_width;
|
||||
}
|
||||
|
||||
float ScaledFont::glyphs_horizontal_kerning(u32 left_code_point, u32 right_code_point) const
|
||||
{
|
||||
if (left_code_point == 0 || right_code_point == 0)
|
||||
return 0.f;
|
||||
|
||||
auto left_glyph_id = glyph_id_for_code_point(left_code_point);
|
||||
auto right_glyph_id = glyph_id_for_code_point(right_code_point);
|
||||
if (left_glyph_id == 0 || right_glyph_id == 0)
|
||||
return 0.f;
|
||||
|
||||
return m_font->glyphs_horizontal_kerning(left_glyph_id, right_glyph_id, m_x_scale);
|
||||
}
|
||||
|
||||
u8 ScaledFont::glyph_fixed_width() const
|
||||
{
|
||||
return glyph_metrics(glyph_id_for_code_point(' ')).advance_width;
|
||||
}
|
||||
|
||||
Gfx::FontPixelMetrics ScaledFont::pixel_metrics() const
|
||||
{
|
||||
auto metrics = m_font->metrics(m_x_scale, m_y_scale);
|
||||
|
||||
return Gfx::FontPixelMetrics {
|
||||
.size = (float)pixel_size(),
|
||||
.x_height = (float)x_height(),
|
||||
.advance_of_ascii_zero = (float)glyph_width('0'),
|
||||
.glyph_spacing = (float)glyph_spacing(),
|
||||
.ascent = metrics.ascender,
|
||||
.descent = -metrics.descender,
|
||||
.line_gap = metrics.line_gap,
|
||||
};
|
||||
}
|
||||
|
||||
u16 OS2::weight_class() const
|
||||
{
|
||||
return be_u16(m_slice.offset_pointer((u32)Offsets::WeightClass));
|
||||
}
|
||||
|
||||
u16 OS2::selection() const
|
||||
{
|
||||
return be_u16(m_slice.offset_pointer((u32)Offsets::Selection));
|
||||
}
|
||||
|
||||
i16 OS2::typographic_ascender() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::TypographicAscender));
|
||||
}
|
||||
|
||||
i16 OS2::typographic_descender() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::TypographicDescender));
|
||||
}
|
||||
|
||||
i16 OS2::typographic_line_gap() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::TypographicLineGap));
|
||||
}
|
||||
|
||||
}
|
170
Userland/Libraries/LibGfx/Font/TrueType/Font.h
Normal file
170
Userland/Libraries/LibGfx/Font/TrueType/Font.h
Normal file
|
@ -0,0 +1,170 @@
|
|||
/*
|
||||
* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <AK/HashMap.h>
|
||||
#include <AK/Noncopyable.h>
|
||||
#include <AK/RefCounted.h>
|
||||
#include <AK/StringView.h>
|
||||
#include <LibGfx/Bitmap.h>
|
||||
#include <LibGfx/Font.h>
|
||||
#include <LibGfx/Size.h>
|
||||
#include <LibGfx/Font/TrueType/Cmap.h>
|
||||
#include <LibGfx/Font/TrueType/Glyf.h>
|
||||
#include <LibGfx/Font/TrueType/Tables.h>
|
||||
|
||||
#define POINTS_PER_INCH 72.0f
|
||||
#define DEFAULT_DPI 96
|
||||
|
||||
namespace TTF {
|
||||
|
||||
struct ScaledFontMetrics {
|
||||
float ascender { 0 };
|
||||
float descender { 0 };
|
||||
float line_gap { 0 };
|
||||
|
||||
int height() const
|
||||
{
|
||||
return ascender - descender;
|
||||
}
|
||||
};
|
||||
|
||||
struct ScaledGlyphMetrics {
|
||||
int ascender;
|
||||
int descender;
|
||||
int advance_width;
|
||||
int left_side_bearing;
|
||||
};
|
||||
|
||||
class Font : public RefCounted<Font> {
|
||||
AK_MAKE_NONCOPYABLE(Font);
|
||||
|
||||
public:
|
||||
static ErrorOr<NonnullRefPtr<Font>> try_load_from_file(String path, unsigned index = 0);
|
||||
static ErrorOr<NonnullRefPtr<Font>> try_load_from_externally_owned_memory(ReadonlyBytes bytes, unsigned index = 0);
|
||||
|
||||
ScaledFontMetrics metrics(float x_scale, float y_scale) const;
|
||||
ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const;
|
||||
float glyphs_horizontal_kerning(u32 left_glyph_id, u32 right_glyph_id, float x_scale) const;
|
||||
RefPtr<Gfx::Bitmap> rasterize_glyph(u32 glyph_id, float x_scale, float y_scale) const;
|
||||
u32 glyph_count() const;
|
||||
u16 units_per_em() const;
|
||||
u32 glyph_id_for_code_point(u32 code_point) const { return m_cmap.glyph_id_for_code_point(code_point); }
|
||||
String family() const;
|
||||
String variant() const;
|
||||
u16 weight() const;
|
||||
u8 slope() const;
|
||||
bool is_fixed_width() const;
|
||||
|
||||
private:
|
||||
enum class Offsets {
|
||||
NumTables = 4,
|
||||
TableRecord_Offset = 8,
|
||||
TableRecord_Length = 12,
|
||||
};
|
||||
enum class Sizes {
|
||||
TTCHeaderV1 = 12,
|
||||
OffsetTable = 12,
|
||||
TableRecord = 16,
|
||||
};
|
||||
|
||||
static ErrorOr<NonnullRefPtr<Font>> try_load_from_offset(ReadonlyBytes, unsigned index = 0);
|
||||
|
||||
Font(ReadonlyBytes bytes, Head&& head, Name&& name, Hhea&& hhea, Maxp&& maxp, Hmtx&& hmtx, Cmap&& cmap, Loca&& loca, Glyf&& glyf, OS2&& os2, Optional<Kern>&& kern)
|
||||
: m_buffer(move(bytes))
|
||||
, m_head(move(head))
|
||||
, m_name(move(name))
|
||||
, m_hhea(move(hhea))
|
||||
, m_maxp(move(maxp))
|
||||
, m_hmtx(move(hmtx))
|
||||
, m_loca(move(loca))
|
||||
, m_glyf(move(glyf))
|
||||
, m_cmap(move(cmap))
|
||||
, m_os2(move(os2))
|
||||
, m_kern(move(kern))
|
||||
{
|
||||
}
|
||||
|
||||
RefPtr<Core::MappedFile> m_mapped_file;
|
||||
|
||||
ReadonlyBytes m_buffer;
|
||||
|
||||
// These are stateful wrappers around non-owning slices
|
||||
Head m_head;
|
||||
Name m_name;
|
||||
Hhea m_hhea;
|
||||
Maxp m_maxp;
|
||||
Hmtx m_hmtx;
|
||||
Loca m_loca;
|
||||
Glyf m_glyf;
|
||||
Cmap m_cmap;
|
||||
OS2 m_os2;
|
||||
Optional<Kern> m_kern;
|
||||
};
|
||||
|
||||
class ScaledFont : public Gfx::Font {
|
||||
public:
|
||||
ScaledFont(NonnullRefPtr<TTF::Font> font, float point_width, float point_height, unsigned dpi_x = DEFAULT_DPI, unsigned dpi_y = DEFAULT_DPI)
|
||||
: m_font(move(font))
|
||||
, m_point_width(point_width)
|
||||
, m_point_height(point_height)
|
||||
{
|
||||
float units_per_em = m_font->units_per_em();
|
||||
m_x_scale = (point_width * dpi_x) / (POINTS_PER_INCH * units_per_em);
|
||||
m_y_scale = (point_height * dpi_y) / (POINTS_PER_INCH * units_per_em);
|
||||
}
|
||||
u32 glyph_id_for_code_point(u32 code_point) const { return m_font->glyph_id_for_code_point(code_point); }
|
||||
ScaledFontMetrics metrics() const { return m_font->metrics(m_x_scale, m_y_scale); }
|
||||
ScaledGlyphMetrics glyph_metrics(u32 glyph_id) const { return m_font->glyph_metrics(glyph_id, m_x_scale, m_y_scale); }
|
||||
RefPtr<Gfx::Bitmap> rasterize_glyph(u32 glyph_id) const;
|
||||
|
||||
// ^Gfx::Font
|
||||
virtual NonnullRefPtr<Font> clone() const override { return *this; } // FIXME: clone() should not need to be implemented
|
||||
virtual u8 presentation_size() const override { return m_point_height; }
|
||||
virtual int pixel_size() const override { return m_point_height * 1.33333333f; }
|
||||
virtual float point_size() const override { return m_point_height; }
|
||||
virtual Gfx::FontPixelMetrics pixel_metrics() const override;
|
||||
virtual u8 slope() const override { return m_font->slope(); }
|
||||
virtual u16 weight() const override { return m_font->weight(); }
|
||||
virtual Gfx::Glyph glyph(u32 code_point) const override;
|
||||
virtual bool contains_glyph(u32 code_point) const override { return m_font->glyph_id_for_code_point(code_point) > 0; }
|
||||
virtual u8 glyph_width(u32 code_point) const override;
|
||||
virtual int glyph_or_emoji_width(u32 code_point) const override;
|
||||
virtual float glyphs_horizontal_kerning(u32 left_code_point, u32 right_code_point) const override;
|
||||
virtual int preferred_line_height() const override { return metrics().height() + metrics().line_gap; }
|
||||
virtual u8 glyph_height() const override { return m_point_height; }
|
||||
virtual int x_height() const override { return m_point_height; } // FIXME: Read from font
|
||||
virtual u8 min_glyph_width() const override { return 1; } // FIXME: Read from font
|
||||
virtual u8 max_glyph_width() const override { return m_point_width; } // FIXME: Read from font
|
||||
virtual u8 glyph_fixed_width() const override;
|
||||
virtual u8 baseline() const override { return m_point_height; } // FIXME: Read from font
|
||||
virtual u8 mean_line() const override { return m_point_height; } // FIXME: Read from font
|
||||
virtual int width(StringView) const override;
|
||||
virtual int width(Utf8View const&) const override;
|
||||
virtual int width(Utf32View const&) const override;
|
||||
virtual String name() const override { return String::formatted("{} {}", family(), variant()); }
|
||||
virtual bool is_fixed_width() const override { return m_font->is_fixed_width(); }
|
||||
virtual u8 glyph_spacing() const override { return 0; }
|
||||
virtual size_t glyph_count() const override { return m_font->glyph_count(); }
|
||||
virtual String family() const override { return m_font->family(); }
|
||||
virtual String variant() const override { return m_font->variant(); }
|
||||
virtual String qualified_name() const override { return String::formatted("{} {} {} {}", family(), presentation_size(), weight(), slope()); }
|
||||
virtual String human_readable_name() const override { return String::formatted("{} {} {}", family(), variant(), presentation_size()); }
|
||||
|
||||
private:
|
||||
NonnullRefPtr<TTF::Font> m_font;
|
||||
float m_x_scale { 0.0f };
|
||||
float m_y_scale { 0.0f };
|
||||
float m_point_width { 0.0f };
|
||||
float m_point_height { 0.0f };
|
||||
mutable HashMap<u32, RefPtr<Gfx::Bitmap>> m_cached_glyph_bitmaps;
|
||||
|
||||
template<typename T>
|
||||
int unicode_view_width(T const& view) const;
|
||||
};
|
||||
|
||||
}
|
504
Userland/Libraries/LibGfx/Font/TrueType/Glyf.cpp
Normal file
504
Userland/Libraries/LibGfx/Font/TrueType/Glyf.cpp
Normal file
|
@ -0,0 +1,504 @@
|
|||
/*
|
||||
* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#include <LibGfx/Font/TrueType/Glyf.h>
|
||||
#include <LibGfx/Path.h>
|
||||
#include <LibGfx/Point.h>
|
||||
|
||||
namespace TTF {
|
||||
|
||||
extern u16 be_u16(u8 const* ptr);
|
||||
extern u32 be_u32(u8 const* ptr);
|
||||
extern i16 be_i16(u8 const* ptr);
|
||||
extern float be_fword(u8 const* ptr);
|
||||
|
||||
enum class SimpleGlyfFlags {
|
||||
// From spec.
|
||||
OnCurve = 0x01,
|
||||
XShortVector = 0x02,
|
||||
YShortVector = 0x04,
|
||||
RepeatFlag = 0x08,
|
||||
XIsSameOrPositiveXShortVector = 0x10,
|
||||
YIsSameOrPositiveYShortVector = 0x20,
|
||||
// Combinations
|
||||
XMask = 0x12,
|
||||
YMask = 0x24,
|
||||
XLongVector = 0x00,
|
||||
YLongVector = 0x00,
|
||||
XNegativeShortVector = 0x02,
|
||||
YNegativeShortVector = 0x04,
|
||||
XPositiveShortVector = 0x12,
|
||||
YPositiveShortVector = 0x24,
|
||||
};
|
||||
|
||||
enum class CompositeGlyfFlags {
|
||||
Arg1AndArg2AreWords = 0x0001,
|
||||
ArgsAreXYValues = 0x0002,
|
||||
RoundXYToGrid = 0x0004,
|
||||
WeHaveAScale = 0x0008,
|
||||
MoreComponents = 0x0020,
|
||||
WeHaveAnXAndYScale = 0x0040,
|
||||
WeHaveATwoByTwo = 0x0080,
|
||||
WeHaveInstructions = 0x0100,
|
||||
UseMyMetrics = 0x0200,
|
||||
OverlapCompound = 0x0400, // Not relevant - can overlap without this set
|
||||
ScaledComponentOffset = 0x0800,
|
||||
UnscaledComponentOffset = 0x1000,
|
||||
};
|
||||
|
||||
class PointIterator {
|
||||
public:
|
||||
struct Item {
|
||||
bool on_curve;
|
||||
Gfx::FloatPoint point;
|
||||
};
|
||||
|
||||
PointIterator(ReadonlyBytes slice, u16 num_points, u32 flags_offset, u32 x_offset, u32 y_offset, Gfx::AffineTransform affine)
|
||||
: m_slice(slice)
|
||||
, m_points_remaining(num_points)
|
||||
, m_flags_offset(flags_offset)
|
||||
, m_x_offset(x_offset)
|
||||
, m_y_offset(y_offset)
|
||||
, m_affine(affine)
|
||||
{
|
||||
}
|
||||
|
||||
Optional<Item> next()
|
||||
{
|
||||
if (m_points_remaining == 0) {
|
||||
return {};
|
||||
}
|
||||
if (m_flags_remaining > 0) {
|
||||
m_flags_remaining--;
|
||||
} else {
|
||||
m_flag = m_slice[m_flags_offset++];
|
||||
if (m_flag & (u8)SimpleGlyfFlags::RepeatFlag) {
|
||||
m_flags_remaining = m_slice[m_flags_offset++];
|
||||
}
|
||||
}
|
||||
switch (m_flag & (u8)SimpleGlyfFlags::XMask) {
|
||||
case (u8)SimpleGlyfFlags::XLongVector:
|
||||
m_last_point.set_x(m_last_point.x() + be_i16(m_slice.offset_pointer(m_x_offset)));
|
||||
m_x_offset += 2;
|
||||
break;
|
||||
case (u8)SimpleGlyfFlags::XNegativeShortVector:
|
||||
m_last_point.set_x(m_last_point.x() - m_slice[m_x_offset++]);
|
||||
break;
|
||||
case (u8)SimpleGlyfFlags::XPositiveShortVector:
|
||||
m_last_point.set_x(m_last_point.x() + m_slice[m_x_offset++]);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
switch (m_flag & (u8)SimpleGlyfFlags::YMask) {
|
||||
case (u8)SimpleGlyfFlags::YLongVector:
|
||||
m_last_point.set_y(m_last_point.y() + be_i16(m_slice.offset_pointer(m_y_offset)));
|
||||
m_y_offset += 2;
|
||||
break;
|
||||
case (u8)SimpleGlyfFlags::YNegativeShortVector:
|
||||
m_last_point.set_y(m_last_point.y() - m_slice[m_y_offset++]);
|
||||
break;
|
||||
case (u8)SimpleGlyfFlags::YPositiveShortVector:
|
||||
m_last_point.set_y(m_last_point.y() + m_slice[m_y_offset++]);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
m_points_remaining--;
|
||||
Item ret = {
|
||||
.on_curve = (m_flag & (u8)SimpleGlyfFlags::OnCurve) != 0,
|
||||
.point = m_affine.map(m_last_point),
|
||||
};
|
||||
return ret;
|
||||
}
|
||||
|
||||
private:
|
||||
ReadonlyBytes m_slice;
|
||||
u16 m_points_remaining;
|
||||
u8 m_flag { 0 };
|
||||
Gfx::FloatPoint m_last_point = { 0.0f, 0.0f };
|
||||
u32 m_flags_remaining = { 0 };
|
||||
u32 m_flags_offset;
|
||||
u32 m_x_offset;
|
||||
u32 m_y_offset;
|
||||
Gfx::AffineTransform m_affine;
|
||||
};
|
||||
|
||||
Optional<Glyf::Glyph::ComponentIterator::Item> Glyf::Glyph::ComponentIterator::next()
|
||||
{
|
||||
if (!m_has_more) {
|
||||
return {};
|
||||
}
|
||||
u16 flags = be_u16(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
u16 glyph_id = be_u16(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
i16 arg1 = 0, arg2 = 0;
|
||||
if (flags & (u16)CompositeGlyfFlags::Arg1AndArg2AreWords) {
|
||||
arg1 = be_i16(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
arg2 = be_i16(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
} else {
|
||||
arg1 = (i8)m_slice[m_offset++];
|
||||
arg2 = (i8)m_slice[m_offset++];
|
||||
}
|
||||
float a = 1.0, b = 0.0, c = 0.0, d = 1.0, e = 0.0, f = 0.0;
|
||||
if (flags & (u16)CompositeGlyfFlags::WeHaveATwoByTwo) {
|
||||
a = be_fword(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
b = be_fword(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
c = be_fword(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
d = be_fword(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
} else if (flags & (u16)CompositeGlyfFlags::WeHaveAnXAndYScale) {
|
||||
a = be_fword(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
d = be_fword(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
} else if (flags & (u16)CompositeGlyfFlags::WeHaveAScale) {
|
||||
a = be_fword(m_slice.offset_pointer(m_offset));
|
||||
m_offset += 2;
|
||||
d = a;
|
||||
}
|
||||
// FIXME: Handle UseMyMetrics, ScaledComponentOffset, UnscaledComponentOffset, non-ArgsAreXYValues
|
||||
if (flags & (u16)CompositeGlyfFlags::ArgsAreXYValues) {
|
||||
e = arg1;
|
||||
f = arg2;
|
||||
} else {
|
||||
// FIXME: Implement this. There's no TODO() here since many fonts work just fine without this.
|
||||
}
|
||||
if (flags & (u16)CompositeGlyfFlags::UseMyMetrics) {
|
||||
// FIXME: Implement this. There's no TODO() here since many fonts work just fine without this.
|
||||
}
|
||||
if (flags & (u16)CompositeGlyfFlags::ScaledComponentOffset) {
|
||||
// FIXME: Implement this. There's no TODO() here since many fonts work just fine without this.
|
||||
}
|
||||
if (flags & (u16)CompositeGlyfFlags::UnscaledComponentOffset) {
|
||||
// FIXME: Implement this. There's no TODO() here since many fonts work just fine without this.
|
||||
}
|
||||
m_has_more = (flags & (u16)CompositeGlyfFlags::MoreComponents);
|
||||
return Item {
|
||||
.glyph_id = glyph_id,
|
||||
.affine = Gfx::AffineTransform(a, b, c, d, e, f),
|
||||
};
|
||||
}
|
||||
|
||||
Rasterizer::Rasterizer(Gfx::IntSize size)
|
||||
: m_size(size)
|
||||
{
|
||||
m_data.resize(m_size.width() * m_size.height());
|
||||
for (int i = 0; i < m_size.width() * m_size.height(); i++) {
|
||||
m_data[i] = 0.0f;
|
||||
}
|
||||
}
|
||||
|
||||
void Rasterizer::draw_path(Gfx::Path& path)
|
||||
{
|
||||
for (auto& line : path.split_lines()) {
|
||||
draw_line(line.from, line.to);
|
||||
}
|
||||
}
|
||||
|
||||
RefPtr<Gfx::Bitmap> Rasterizer::accumulate()
|
||||
{
|
||||
auto bitmap_or_error = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, m_size);
|
||||
if (bitmap_or_error.is_error())
|
||||
return {};
|
||||
auto bitmap = bitmap_or_error.release_value_but_fixme_should_propagate_errors();
|
||||
Color base_color = Color::from_rgb(0xffffff);
|
||||
for (int y = 0; y < m_size.height(); y++) {
|
||||
float accumulator = 0.0;
|
||||
for (int x = 0; x < m_size.width(); x++) {
|
||||
accumulator += m_data[y * m_size.width() + x];
|
||||
float value = accumulator;
|
||||
if (value < 0.0f) {
|
||||
value = -value;
|
||||
}
|
||||
if (value > 1.0f) {
|
||||
value = 1.0;
|
||||
}
|
||||
u8 alpha = value * 255.0f;
|
||||
bitmap->set_pixel(x, y, base_color.with_alpha(alpha));
|
||||
}
|
||||
}
|
||||
return bitmap;
|
||||
}
|
||||
|
||||
void Rasterizer::draw_line(Gfx::FloatPoint p0, Gfx::FloatPoint p1)
|
||||
{
|
||||
// FIXME: Shift x and y according to dy/dx
|
||||
if (p0.x() < 0.0f) {
|
||||
p0.set_x(roundf(p0.x()));
|
||||
}
|
||||
if (p0.y() < 0.0f) {
|
||||
p0.set_y(roundf(p0.y()));
|
||||
}
|
||||
if (p1.x() < 0.0f) {
|
||||
p1.set_x(roundf(p1.x()));
|
||||
}
|
||||
if (p1.y() < 0.0f) {
|
||||
p1.set_y(roundf(p1.y()));
|
||||
}
|
||||
|
||||
if (!(p0.x() >= 0.0f && p0.y() >= 0.0f && p0.x() <= m_size.width() && p0.y() <= m_size.height())) {
|
||||
dbgln("!P0({},{})", p0.x(), p0.y());
|
||||
return;
|
||||
}
|
||||
|
||||
if (!(p1.x() >= 0.0f && p1.y() >= 0.0f && p1.x() <= m_size.width() && p1.y() <= m_size.height())) {
|
||||
dbgln("!P1({},{})", p1.x(), p1.y());
|
||||
return;
|
||||
}
|
||||
|
||||
VERIFY(p0.x() >= 0.0f && p0.y() >= 0.0f && p0.x() <= m_size.width() && p0.y() <= m_size.height());
|
||||
VERIFY(p1.x() >= 0.0f && p1.y() >= 0.0f && p1.x() <= m_size.width() && p1.y() <= m_size.height());
|
||||
|
||||
// If we're on the same Y, there's no need to draw
|
||||
if (p0.y() == p1.y()) {
|
||||
return;
|
||||
}
|
||||
|
||||
float direction = -1.0;
|
||||
if (p1.y() < p0.y()) {
|
||||
direction = 1.0;
|
||||
auto tmp = p0;
|
||||
p0 = p1;
|
||||
p1 = tmp;
|
||||
}
|
||||
|
||||
float dxdy = (p1.x() - p0.x()) / (p1.y() - p0.y());
|
||||
u32 y0 = floorf(p0.y());
|
||||
u32 y1 = ceilf(p1.y());
|
||||
float x_cur = p0.x();
|
||||
|
||||
for (u32 y = y0; y < y1; y++) {
|
||||
u32 line_offset = m_size.width() * y;
|
||||
|
||||
float dy = min(y + 1.0f, p1.y()) - max((float)y, p0.y());
|
||||
float directed_dy = dy * direction;
|
||||
float x_next = x_cur + dy * dxdy;
|
||||
if (x_next < 0.0f) {
|
||||
x_next = 0.0f;
|
||||
}
|
||||
float x0 = x_cur;
|
||||
float x1 = x_next;
|
||||
if (x1 < x0) {
|
||||
x1 = x_cur;
|
||||
x0 = x_next;
|
||||
}
|
||||
float x0_floor = floorf(x0);
|
||||
float x1_ceil = ceilf(x1);
|
||||
u32 x0i = x0_floor;
|
||||
|
||||
if (x1_ceil <= x0_floor + 1.0f) {
|
||||
// If x0 and x1 are within the same pixel, then area to the right is (1 - (mid(x0, x1) - x0_floor)) * dy
|
||||
float area = ((x0 + x1) * 0.5f) - x0_floor;
|
||||
m_data[line_offset + x0i] += directed_dy * (1.0f - area);
|
||||
m_data[line_offset + x0i + 1] += directed_dy * area;
|
||||
} else {
|
||||
float dydx = 1.0f / dxdy;
|
||||
if (dydx < 0)
|
||||
dydx = -dydx;
|
||||
|
||||
float x0_right = 1.0f - (x0 - x0_floor);
|
||||
u32 x1_floor_i = floorf(x1);
|
||||
float area_upto_here = 0.5f * x0_right * x0_right * dydx;
|
||||
m_data[line_offset + x0i] += direction * area_upto_here;
|
||||
for (u32 x = x0i + 1; x < x1_floor_i; x++) {
|
||||
m_data[line_offset + x] += direction * dydx;
|
||||
area_upto_here += dydx;
|
||||
}
|
||||
float remaining_area = (dy - area_upto_here);
|
||||
m_data[line_offset + x1_floor_i] += direction * remaining_area;
|
||||
}
|
||||
|
||||
x_cur = x_next;
|
||||
}
|
||||
}
|
||||
|
||||
Optional<Loca> Loca::from_slice(ReadonlyBytes slice, u32 num_glyphs, IndexToLocFormat index_to_loc_format)
|
||||
{
|
||||
switch (index_to_loc_format) {
|
||||
case IndexToLocFormat::Offset16:
|
||||
if (slice.size() < num_glyphs * 2) {
|
||||
return {};
|
||||
}
|
||||
break;
|
||||
case IndexToLocFormat::Offset32:
|
||||
if (slice.size() < num_glyphs * 4) {
|
||||
return {};
|
||||
}
|
||||
break;
|
||||
}
|
||||
return Loca(slice, num_glyphs, index_to_loc_format);
|
||||
}
|
||||
|
||||
u32 Loca::get_glyph_offset(u32 glyph_id) const
|
||||
{
|
||||
VERIFY(glyph_id < m_num_glyphs);
|
||||
switch (m_index_to_loc_format) {
|
||||
case IndexToLocFormat::Offset16:
|
||||
return ((u32)be_u16(m_slice.offset_pointer(glyph_id * 2))) * 2;
|
||||
case IndexToLocFormat::Offset32:
|
||||
return be_u32(m_slice.offset_pointer(glyph_id * 4));
|
||||
default:
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
|
||||
static void get_ttglyph_offsets(ReadonlyBytes slice, u32 num_points, u32 flags_offset, u32* x_offset, u32* y_offset)
|
||||
{
|
||||
u32 flags_size = 0;
|
||||
u32 x_size = 0;
|
||||
u32 repeat_count;
|
||||
while (num_points > 0) {
|
||||
u8 flag = slice[flags_offset + flags_size];
|
||||
if (flag & (u8)SimpleGlyfFlags::RepeatFlag) {
|
||||
flags_size++;
|
||||
repeat_count = slice[flags_offset + flags_size] + 1;
|
||||
} else {
|
||||
repeat_count = 1;
|
||||
}
|
||||
flags_size++;
|
||||
switch (flag & (u8)SimpleGlyfFlags::XMask) {
|
||||
case (u8)SimpleGlyfFlags::XLongVector:
|
||||
x_size += repeat_count * 2;
|
||||
break;
|
||||
case (u8)SimpleGlyfFlags::XNegativeShortVector:
|
||||
case (u8)SimpleGlyfFlags::XPositiveShortVector:
|
||||
x_size += repeat_count;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
num_points -= repeat_count;
|
||||
}
|
||||
*x_offset = flags_offset + flags_size;
|
||||
*y_offset = *x_offset + x_size;
|
||||
}
|
||||
|
||||
void Glyf::Glyph::rasterize_impl(Rasterizer& rasterizer, Gfx::AffineTransform const& transform) const
|
||||
{
|
||||
// Get offset for flags, x, and y.
|
||||
u16 num_points = be_u16(m_slice.offset_pointer((m_num_contours - 1) * 2)) + 1;
|
||||
u16 num_instructions = be_u16(m_slice.offset_pointer(m_num_contours * 2));
|
||||
u32 flags_offset = m_num_contours * 2 + 2 + num_instructions;
|
||||
u32 x_offset = 0;
|
||||
u32 y_offset = 0;
|
||||
get_ttglyph_offsets(m_slice, num_points, flags_offset, &x_offset, &y_offset);
|
||||
|
||||
// Prepare to render glyph.
|
||||
Gfx::Path path;
|
||||
PointIterator point_iterator(m_slice, num_points, flags_offset, x_offset, y_offset, transform);
|
||||
|
||||
int last_contour_end = -1;
|
||||
i32 contour_index = 0;
|
||||
u32 contour_size = 0;
|
||||
Optional<Gfx::FloatPoint> contour_start = {};
|
||||
Optional<Gfx::FloatPoint> last_offcurve_point = {};
|
||||
|
||||
// Render glyph
|
||||
while (true) {
|
||||
if (!contour_start.has_value()) {
|
||||
if (contour_index >= m_num_contours) {
|
||||
break;
|
||||
}
|
||||
int current_contour_end = be_u16(m_slice.offset_pointer(contour_index++ * 2));
|
||||
contour_size = current_contour_end - last_contour_end;
|
||||
last_contour_end = current_contour_end;
|
||||
auto opt_item = point_iterator.next();
|
||||
VERIFY(opt_item.has_value());
|
||||
contour_start = opt_item.value().point;
|
||||
path.move_to(contour_start.value());
|
||||
contour_size--;
|
||||
} else if (!last_offcurve_point.has_value()) {
|
||||
if (contour_size > 0) {
|
||||
auto opt_item = point_iterator.next();
|
||||
// FIXME: Should we draw a line to the first point here?
|
||||
if (!opt_item.has_value()) {
|
||||
break;
|
||||
}
|
||||
auto item = opt_item.value();
|
||||
contour_size--;
|
||||
if (item.on_curve) {
|
||||
path.line_to(item.point);
|
||||
} else if (contour_size > 0) {
|
||||
auto opt_next_item = point_iterator.next();
|
||||
// FIXME: Should we draw a quadratic bezier to the first point here?
|
||||
if (!opt_next_item.has_value()) {
|
||||
break;
|
||||
}
|
||||
auto next_item = opt_next_item.value();
|
||||
contour_size--;
|
||||
if (next_item.on_curve) {
|
||||
path.quadratic_bezier_curve_to(item.point, next_item.point);
|
||||
} else {
|
||||
auto mid_point = (item.point + next_item.point) * 0.5f;
|
||||
path.quadratic_bezier_curve_to(item.point, mid_point);
|
||||
last_offcurve_point = next_item.point;
|
||||
}
|
||||
} else {
|
||||
path.quadratic_bezier_curve_to(item.point, contour_start.value());
|
||||
contour_start = {};
|
||||
}
|
||||
} else {
|
||||
path.line_to(contour_start.value());
|
||||
contour_start = {};
|
||||
}
|
||||
} else {
|
||||
auto point0 = last_offcurve_point.value();
|
||||
last_offcurve_point = {};
|
||||
if (contour_size > 0) {
|
||||
auto opt_item = point_iterator.next();
|
||||
// FIXME: Should we draw a quadratic bezier to the first point here?
|
||||
if (!opt_item.has_value()) {
|
||||
break;
|
||||
}
|
||||
auto item = opt_item.value();
|
||||
contour_size--;
|
||||
if (item.on_curve) {
|
||||
path.quadratic_bezier_curve_to(point0, item.point);
|
||||
} else {
|
||||
auto mid_point = (point0 + item.point) * 0.5f;
|
||||
path.quadratic_bezier_curve_to(point0, mid_point);
|
||||
last_offcurve_point = item.point;
|
||||
}
|
||||
} else {
|
||||
path.quadratic_bezier_curve_to(point0, contour_start.value());
|
||||
contour_start = {};
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
rasterizer.draw_path(path);
|
||||
}
|
||||
|
||||
RefPtr<Gfx::Bitmap> Glyf::Glyph::rasterize_simple(i16 font_ascender, i16 font_descender, float x_scale, float y_scale) const
|
||||
{
|
||||
u32 width = (u32)(ceilf((m_xmax - m_xmin) * x_scale)) + 2;
|
||||
u32 height = (u32)(ceilf((font_ascender - font_descender) * y_scale)) + 2;
|
||||
Rasterizer rasterizer(Gfx::IntSize(width, height));
|
||||
auto affine = Gfx::AffineTransform().scale(x_scale, -y_scale).translate(-m_xmin, -font_ascender);
|
||||
rasterize_impl(rasterizer, affine);
|
||||
return rasterizer.accumulate();
|
||||
}
|
||||
|
||||
Glyf::Glyph Glyf::glyph(u32 offset) const
|
||||
{
|
||||
VERIFY(m_slice.size() >= offset + (u32)Sizes::GlyphHeader);
|
||||
i16 num_contours = be_i16(m_slice.offset_pointer(offset));
|
||||
i16 xmin = be_i16(m_slice.offset_pointer(offset + (u32)Offsets::XMin));
|
||||
i16 ymin = be_i16(m_slice.offset_pointer(offset + (u32)Offsets::YMin));
|
||||
i16 xmax = be_i16(m_slice.offset_pointer(offset + (u32)Offsets::XMax));
|
||||
i16 ymax = be_i16(m_slice.offset_pointer(offset + (u32)Offsets::YMax));
|
||||
auto slice = ReadonlyBytes(m_slice.offset_pointer(offset + (u32)Sizes::GlyphHeader), m_slice.size() - offset - (u32)Sizes::GlyphHeader);
|
||||
return Glyph(slice, xmin, ymin, xmax, ymax, num_contours);
|
||||
}
|
||||
|
||||
}
|
156
Userland/Libraries/LibGfx/Font/TrueType/Glyf.h
Normal file
156
Userland/Libraries/LibGfx/Font/TrueType/Glyf.h
Normal file
|
@ -0,0 +1,156 @@
|
|||
/*
|
||||
* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <AK/Span.h>
|
||||
#include <AK/Vector.h>
|
||||
#include <LibGfx/AffineTransform.h>
|
||||
#include <LibGfx/Bitmap.h>
|
||||
#include <LibGfx/Font/TrueType/Tables.h>
|
||||
#include <math.h>
|
||||
|
||||
namespace TTF {
|
||||
|
||||
class Rasterizer {
|
||||
public:
|
||||
Rasterizer(Gfx::IntSize);
|
||||
void draw_path(Gfx::Path&);
|
||||
RefPtr<Gfx::Bitmap> accumulate();
|
||||
|
||||
private:
|
||||
void draw_line(Gfx::FloatPoint, Gfx::FloatPoint);
|
||||
|
||||
Gfx::IntSize m_size;
|
||||
Vector<float> m_data;
|
||||
};
|
||||
|
||||
class Loca {
|
||||
public:
|
||||
static Optional<Loca> from_slice(ReadonlyBytes, u32 num_glyphs, IndexToLocFormat);
|
||||
u32 get_glyph_offset(u32 glyph_id) const;
|
||||
|
||||
private:
|
||||
Loca(ReadonlyBytes slice, u32 num_glyphs, IndexToLocFormat index_to_loc_format)
|
||||
: m_slice(slice)
|
||||
, m_num_glyphs(num_glyphs)
|
||||
, m_index_to_loc_format(index_to_loc_format)
|
||||
{
|
||||
}
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
u32 m_num_glyphs { 0 };
|
||||
IndexToLocFormat m_index_to_loc_format;
|
||||
};
|
||||
|
||||
class Glyf {
|
||||
public:
|
||||
class Glyph {
|
||||
public:
|
||||
Glyph(ReadonlyBytes slice, i16 xmin, i16 ymin, i16 xmax, i16 ymax, i16 num_contours = -1)
|
||||
: m_xmin(xmin)
|
||||
, m_ymin(ymin)
|
||||
, m_xmax(xmax)
|
||||
, m_ymax(ymax)
|
||||
, m_num_contours(num_contours)
|
||||
, m_slice(slice)
|
||||
{
|
||||
if (m_num_contours >= 0) {
|
||||
m_type = Type::Simple;
|
||||
}
|
||||
}
|
||||
template<typename GlyphCb>
|
||||
RefPtr<Gfx::Bitmap> rasterize(i16 font_ascender, i16 font_descender, float x_scale, float y_scale, GlyphCb glyph_callback) const
|
||||
{
|
||||
switch (m_type) {
|
||||
case Type::Simple:
|
||||
return rasterize_simple(font_ascender, font_descender, x_scale, y_scale);
|
||||
case Type::Composite:
|
||||
return rasterize_composite(font_ascender, font_descender, x_scale, y_scale, glyph_callback);
|
||||
}
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
int ascender() const { return m_ymax; }
|
||||
int descender() const { return m_ymin; }
|
||||
|
||||
private:
|
||||
enum class Type {
|
||||
Simple,
|
||||
Composite,
|
||||
};
|
||||
|
||||
class ComponentIterator {
|
||||
public:
|
||||
struct Item {
|
||||
u16 glyph_id;
|
||||
Gfx::AffineTransform affine;
|
||||
};
|
||||
|
||||
ComponentIterator(ReadonlyBytes slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
Optional<Item> next();
|
||||
|
||||
private:
|
||||
ReadonlyBytes m_slice;
|
||||
bool m_has_more { true };
|
||||
u32 m_offset { 0 };
|
||||
};
|
||||
|
||||
void rasterize_impl(Rasterizer&, Gfx::AffineTransform const&) const;
|
||||
RefPtr<Gfx::Bitmap> rasterize_simple(i16 ascender, i16 descender, float x_scale, float y_scale) const;
|
||||
template<typename GlyphCb>
|
||||
RefPtr<Gfx::Bitmap> rasterize_composite(i16 font_ascender, i16 font_descender, float x_scale, float y_scale, GlyphCb glyph_callback) const
|
||||
{
|
||||
u32 width = (u32)(ceilf((m_xmax - m_xmin) * x_scale)) + 1;
|
||||
u32 height = (u32)(ceilf((font_ascender - font_descender) * y_scale)) + 1;
|
||||
Rasterizer rasterizer(Gfx::IntSize(width, height));
|
||||
auto affine = Gfx::AffineTransform().scale(x_scale, -y_scale).translate(-m_xmin, -font_ascender);
|
||||
ComponentIterator component_iterator(m_slice);
|
||||
while (true) {
|
||||
auto opt_item = component_iterator.next();
|
||||
if (!opt_item.has_value()) {
|
||||
break;
|
||||
}
|
||||
auto item = opt_item.value();
|
||||
auto affine_here = affine.multiply(item.affine);
|
||||
auto glyph = glyph_callback(item.glyph_id);
|
||||
glyph.rasterize_impl(rasterizer, affine_here);
|
||||
}
|
||||
return rasterizer.accumulate();
|
||||
}
|
||||
|
||||
Type m_type { Type::Composite };
|
||||
i16 m_xmin { 0 };
|
||||
i16 m_ymin { 0 };
|
||||
i16 m_xmax { 0 };
|
||||
i16 m_ymax { 0 };
|
||||
i16 m_num_contours { -1 };
|
||||
ReadonlyBytes m_slice;
|
||||
};
|
||||
|
||||
Glyf(ReadonlyBytes slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
Glyph glyph(u32 offset) const;
|
||||
|
||||
private:
|
||||
enum class Offsets {
|
||||
XMin = 2,
|
||||
YMin = 4,
|
||||
XMax = 6,
|
||||
YMax = 8,
|
||||
};
|
||||
enum class Sizes {
|
||||
GlyphHeader = 10,
|
||||
};
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
};
|
||||
|
||||
}
|
230
Userland/Libraries/LibGfx/Font/TrueType/Tables.h
Normal file
230
Userland/Libraries/LibGfx/Font/TrueType/Tables.h
Normal file
|
@ -0,0 +1,230 @@
|
|||
/*
|
||||
* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
|
||||
* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <AK/Error.h>
|
||||
#include <AK/FixedArray.h>
|
||||
#include <AK/Span.h>
|
||||
#include <AK/String.h>
|
||||
|
||||
namespace TTF {
|
||||
|
||||
enum class IndexToLocFormat {
|
||||
Offset16,
|
||||
Offset32,
|
||||
};
|
||||
|
||||
class Head {
|
||||
public:
|
||||
static Optional<Head> from_slice(ReadonlyBytes);
|
||||
u16 units_per_em() const;
|
||||
i16 xmin() const;
|
||||
i16 ymin() const;
|
||||
i16 xmax() const;
|
||||
i16 ymax() const;
|
||||
u16 style() 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,
|
||||
Style = 44,
|
||||
LowestRecPPEM = 46,
|
||||
IndexToLocFormat = 50,
|
||||
};
|
||||
enum class Sizes {
|
||||
Table = 54,
|
||||
};
|
||||
|
||||
Head(ReadonlyBytes slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
};
|
||||
|
||||
class Hhea {
|
||||
public:
|
||||
static Optional<Hhea> from_slice(ReadonlyBytes);
|
||||
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 slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
};
|
||||
|
||||
class Maxp {
|
||||
public:
|
||||
static Optional<Maxp> from_slice(ReadonlyBytes);
|
||||
u16 num_glyphs() const;
|
||||
|
||||
private:
|
||||
enum class Offsets {
|
||||
NumGlyphs = 4
|
||||
};
|
||||
enum class Sizes {
|
||||
TableV0p5 = 6,
|
||||
};
|
||||
|
||||
Maxp(ReadonlyBytes slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
};
|
||||
|
||||
struct GlyphHorizontalMetrics {
|
||||
u16 advance_width;
|
||||
i16 left_side_bearing;
|
||||
};
|
||||
|
||||
class Hmtx {
|
||||
public:
|
||||
static Optional<Hmtx> from_slice(ReadonlyBytes, 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 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 {
|
||||
WeightClass = 4,
|
||||
Selection = 62,
|
||||
TypographicAscender = 68,
|
||||
TypographicDescender = 70,
|
||||
TypographicLineGap = 72,
|
||||
};
|
||||
|
||||
u16 weight_class() const;
|
||||
u16 selection() const;
|
||||
i16 typographic_ascender() const;
|
||||
i16 typographic_descender() const;
|
||||
i16 typographic_line_gap() const;
|
||||
|
||||
explicit OS2(ReadonlyBytes 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<Name> from_slice(ReadonlyBytes);
|
||||
|
||||
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 slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
|
||||
String string_for_id(NameId id) const;
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
};
|
||||
|
||||
class Kern {
|
||||
public:
|
||||
static ErrorOr<Kern> from_slice(ReadonlyBytes);
|
||||
i16 get_glyph_kerning(u16 left_glyph_id, u16 right_glyph_id) const;
|
||||
|
||||
private:
|
||||
enum Sizes : size_t {
|
||||
SubtableHeader = 6,
|
||||
Format0Entry = 6,
|
||||
};
|
||||
|
||||
Kern(ReadonlyBytes slice, FixedArray<size_t> subtable_offsets)
|
||||
: m_slice(slice)
|
||||
, m_subtable_offsets(move(subtable_offsets))
|
||||
{
|
||||
}
|
||||
|
||||
static Optional<i16> read_glyph_kerning_format0(ReadonlyBytes slice, u16 left_glyph_id, u16 right_glyph_id);
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
FixedArray<size_t> m_subtable_offsets;
|
||||
};
|
||||
|
||||
}
|
Loading…
Add table
Add a link
Reference in a new issue