mirror of
https://github.com/RGBCube/serenity
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130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
/*
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* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Span.h>
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namespace TTF {
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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(const 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_codepoint(u32 codepoint) const;
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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_codepoint_table_4(u32 codepoint) const;
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u32 glyph_id_for_codepoint_table_12(u32 codepoint) 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(const 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_codepoint(u32 codepoint) 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(const ReadonlyBytes& slice)
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: m_slice(slice)
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{
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}
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ReadonlyBytes m_slice;
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u32 m_active_index { UINT32_MAX };
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};
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}
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