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/*
* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Span.h>
namespace TTF {
class Cmap {
public:
class Subtable {
public:
enum class Platform {
Unicode = 0,
Macintosh = 1,
Windows = 3,
Custom = 4,
};
enum class Format {
ByteEncoding = 0,
HighByte = 2,
SegmentToDelta = 4,
TrimmedTable = 6,
Mixed16And32 = 8,
TrimmedArray = 10,
SegmentedCoverage = 12,
ManyToOneRange = 13,
UnicodeVariationSequences = 14,
};
enum class WindowsEncoding {
UnicodeBMP = 1,
UnicodeFullRepertoire = 10,
};
Subtable(const ReadonlyBytes& slice, u16 platform_id, u16 encoding_id)
: m_slice(slice)
, m_raw_platform_id(platform_id)
, m_encoding_id(encoding_id)
{
}
// Returns 0 if glyph not found. This corresponds to the "missing glyph"
u32 glyph_id_for_codepoint(u32 codepoint) const;
Platform platform_id() const;
u16 encoding_id() const { return m_encoding_id; }
Format format() const;
private:
enum class Table4Offsets {
SegCountX2 = 6,
EndConstBase = 14,
StartConstBase = 16,
DeltaConstBase = 16,
RangeConstBase = 16,
GlyphOffsetConstBase = 16,
};
enum class Table4Sizes {
Constant = 16,
NonConstMultiplier = 4,
};
enum class Table12Offsets {
NumGroups = 12,
Record_StartCode = 16,
Record_EndCode = 20,
Record_StartGlyph = 24,
};
enum class Table12Sizes {
Header = 16,
Record = 12,
};
u32 glyph_id_for_codepoint_table_4(u32 codepoint) const;
u32 glyph_id_for_codepoint_table_12(u32 codepoint) const;
ReadonlyBytes m_slice;
u16 m_raw_platform_id { 0 };
u16 m_encoding_id { 0 };
};
static Optional<Cmap> from_slice(const ReadonlyBytes&);
u32 num_subtables() const;
Optional<Subtable> subtable(u32 index) const;
void set_active_index(u32 index) { m_active_index = index; }
// Returns 0 if glyph not found. This corresponds to the "missing glyph"
u32 glyph_id_for_codepoint(u32 codepoint) const;
private:
enum class Offsets {
NumTables = 2,
EncodingRecord_EncodingID = 2,
EncodingRecord_Offset = 4,
};
enum class Sizes {
TableHeader = 4,
EncodingRecord = 8,
};
Cmap(const ReadonlyBytes& slice)
: m_slice(slice)
{
}
ReadonlyBytes m_slice;
u32 m_active_index { UINT32_MAX };
};
}
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