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Libraries: Move to Userland/Libraries/
This commit is contained in:
Andreas Kling
parent
dc28c07fa5
commit
13d7c09125
1857 changed files with 266 additions and 274 deletions
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/*
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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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#include <AK/Optional.h>
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#include <LibTTF/Cmap.h>
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namespace TTF {
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extern u16 be_u16(const u8* ptr);
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extern u32 be_u32(const u8* ptr);
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extern i16 be_i16(const u8* ptr);
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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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ASSERT_NOT_REACHED();
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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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ASSERT_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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ASSERT(subtable_offset < m_slice.size());
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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_codepoint(u32 codepoint) 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_codepoint_table_4(codepoint);
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case Format::SegmentedCoverage:
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return glyph_id_for_codepoint_table_12(codepoint);
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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_codepoint_table_4(u32 codepoint) 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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}
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for (u32 offset = 0; offset < segcount_x2; offset += 2) {
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u32 end_codepoint = be_u16(m_slice.offset_pointer((u32)Table4Offsets::EndConstBase + offset));
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if (codepoint > end_codepoint) {
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continue;
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}
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u32 start_codepoint = be_u16(m_slice.offset_pointer((u32)Table4Offsets::StartConstBase + segcount_x2 + offset));
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if (codepoint < start_codepoint) {
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break;
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}
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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 (codepoint + delta) & 0xffff;
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}
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u32 glyph_offset = (u32)Table4Offsets::GlyphOffsetConstBase + segcount_x2 * 3 + offset + range + (codepoint - start_codepoint) * 2;
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ASSERT(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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return 0;
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}
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u32 Cmap::Subtable::glyph_id_for_codepoint_table_12(u32 codepoint) 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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ASSERT(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_codepoint = be_u32(m_slice.offset_pointer((u32)Table12Offsets::Record_StartCode + offset));
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if (codepoint < start_codepoint) {
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break;
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}
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u32 end_codepoint = be_u32(m_slice.offset_pointer((u32)Table12Offsets::Record_EndCode + offset));
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if (codepoint > end_codepoint) {
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continue;
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}
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u32 glyph_offset = be_u32(m_slice.offset_pointer((u32)Table12Offsets::Record_StartGlyph + offset));
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return codepoint - start_codepoint + 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_codepoint(u32 codepoint) 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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}
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auto subtable = opt_subtable.value();
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return subtable.glyph_id_for_codepoint(codepoint);
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}
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Optional<Cmap> Cmap::from_slice(const 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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}
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return Cmap(slice);
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}
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}
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