mirror of
https://github.com/RGBCube/serenity
synced 2025-07-28 02:27:44 +00:00
Libraries: Move to Userland/Libraries/
This commit is contained in:
parent
dc28c07fa5
commit
13d7c09125
1857 changed files with 266 additions and 274 deletions
8
Userland/Libraries/LibTTF/CMakeLists.txt
Normal file
8
Userland/Libraries/LibTTF/CMakeLists.txt
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@ -0,0 +1,8 @@
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set(SOURCES
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Cmap.cpp
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Font.cpp
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Glyf.cpp
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)
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serenity_lib(LibTTF ttf)
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target_link_libraries(LibTTF LibGfx LibM LibCore)
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174
Userland/Libraries/LibTTF/Cmap.cpp
Normal file
174
Userland/Libraries/LibTTF/Cmap.cpp
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@ -0,0 +1,174 @@
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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
|
||||
* 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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130
Userland/Libraries/LibTTF/Cmap.h
Normal file
130
Userland/Libraries/LibTTF/Cmap.h
Normal file
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@ -0,0 +1,130 @@
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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:
|
||||
*
|
||||
* 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.
|
||||
*
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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
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
* 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
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* 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
|
||||
* 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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}
|
469
Userland/Libraries/LibTTF/Font.cpp
Normal file
469
Userland/Libraries/LibTTF/Font.cpp
Normal file
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@ -0,0 +1,469 @@
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/*
|
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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.
|
||||
*/
|
||||
|
||||
#include "AK/ByteBuffer.h"
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#include <AK/Checked.h>
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#include <AK/LogStream.h>
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#include <AK/Utf32View.h>
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#include <AK/Utf8View.h>
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#include <LibCore/File.h>
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#include <LibTTF/Cmap.h>
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#include <LibTTF/Font.h>
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#include <LibTTF/Glyf.h>
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#include <LibTTF/Tables.h>
|
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#include <math.h>
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|
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namespace TTF {
|
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|
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u16 be_u16(const u8* ptr);
|
||||
u32 be_u32(const u8* ptr);
|
||||
i16 be_i16(const u8* ptr);
|
||||
float be_fword(const u8* ptr);
|
||||
u32 tag_from_str(const char* str);
|
||||
|
||||
u16 be_u16(const u8* ptr)
|
||||
{
|
||||
return (((u16)ptr[0]) << 8) | ((u16)ptr[1]);
|
||||
}
|
||||
|
||||
u32 be_u32(const u8* ptr)
|
||||
{
|
||||
return (((u32)ptr[0]) << 24) | (((u32)ptr[1]) << 16) | (((u32)ptr[2]) << 8) | ((u32)ptr[3]);
|
||||
}
|
||||
|
||||
i16 be_i16(const u8* ptr)
|
||||
{
|
||||
return (((i16)ptr[0]) << 8) | ((i16)ptr[1]);
|
||||
}
|
||||
|
||||
float be_fword(const u8* ptr)
|
||||
{
|
||||
return (float)be_i16(ptr) / (float)(1 << 14);
|
||||
}
|
||||
|
||||
u32 tag_from_str(const char* str)
|
||||
{
|
||||
return be_u32((const u8*)str);
|
||||
}
|
||||
|
||||
Optional<Head> Head::from_slice(const ReadonlyBytes& slice)
|
||||
{
|
||||
if (slice.size() < (size_t)Sizes::Table) {
|
||||
return {};
|
||||
}
|
||||
return Head(slice);
|
||||
}
|
||||
|
||||
u16 Head::units_per_em() const
|
||||
{
|
||||
return be_u16(m_slice.offset_pointer((u32)Offsets::UnitsPerEM));
|
||||
}
|
||||
|
||||
i16 Head::xmin() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::XMin));
|
||||
}
|
||||
|
||||
i16 Head::ymin() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::YMin));
|
||||
}
|
||||
|
||||
i16 Head::xmax() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::XMax));
|
||||
}
|
||||
|
||||
i16 Head::ymax() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::YMax));
|
||||
}
|
||||
|
||||
u16 Head::lowest_recommended_ppem() const
|
||||
{
|
||||
return be_u16(m_slice.offset_pointer((u32)Offsets::LowestRecPPEM));
|
||||
}
|
||||
|
||||
IndexToLocFormat Head::index_to_loc_format() const
|
||||
{
|
||||
i16 raw = be_i16(m_slice.offset_pointer((u32)Offsets::IndexToLocFormat));
|
||||
switch (raw) {
|
||||
case 0:
|
||||
return IndexToLocFormat::Offset16;
|
||||
case 1:
|
||||
return IndexToLocFormat::Offset32;
|
||||
default:
|
||||
ASSERT_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
|
||||
Optional<Hhea> Hhea::from_slice(const ReadonlyBytes& slice)
|
||||
{
|
||||
if (slice.size() < (size_t)Sizes::Table) {
|
||||
return {};
|
||||
}
|
||||
return Hhea(slice);
|
||||
}
|
||||
|
||||
i16 Hhea::ascender() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::Ascender));
|
||||
}
|
||||
|
||||
i16 Hhea::descender() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::Descender));
|
||||
}
|
||||
|
||||
i16 Hhea::line_gap() const
|
||||
{
|
||||
return be_i16(m_slice.offset_pointer((u32)Offsets::LineGap));
|
||||
}
|
||||
|
||||
u16 Hhea::advance_width_max() const
|
||||
{
|
||||
return be_u16(m_slice.offset_pointer((u32)Offsets::AdvanceWidthMax));
|
||||
}
|
||||
|
||||
u16 Hhea::number_of_h_metrics() const
|
||||
{
|
||||
return be_u16(m_slice.offset_pointer((u32)Offsets::NumberOfHMetrics));
|
||||
}
|
||||
|
||||
Optional<Maxp> Maxp::from_slice(const ReadonlyBytes& slice)
|
||||
{
|
||||
if (slice.size() < (size_t)Sizes::TableV0p5) {
|
||||
return {};
|
||||
}
|
||||
return Maxp(slice);
|
||||
}
|
||||
|
||||
u16 Maxp::num_glyphs() const
|
||||
{
|
||||
return be_u16(m_slice.offset_pointer((u32)Offsets::NumGlyphs));
|
||||
}
|
||||
|
||||
Optional<Hmtx> Hmtx::from_slice(const ReadonlyBytes& slice, u32 num_glyphs, u32 number_of_h_metrics)
|
||||
{
|
||||
if (slice.size() < number_of_h_metrics * (u32)Sizes::LongHorMetric + (num_glyphs - number_of_h_metrics) * (u32)Sizes::LeftSideBearing) {
|
||||
return {};
|
||||
}
|
||||
return Hmtx(slice, num_glyphs, number_of_h_metrics);
|
||||
}
|
||||
|
||||
GlyphHorizontalMetrics Hmtx::get_glyph_horizontal_metrics(u32 glyph_id) const
|
||||
{
|
||||
ASSERT(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,
|
||||
};
|
||||
}
|
||||
|
||||
RefPtr<Font> Font::load_from_file(const StringView& path, unsigned index)
|
||||
{
|
||||
auto file_or_error = Core::File::open(String(path), Core::IODevice::ReadOnly);
|
||||
if (file_or_error.is_error()) {
|
||||
dbg() << "Could not open file: " << file_or_error.error();
|
||||
return nullptr;
|
||||
}
|
||||
auto file = file_or_error.value();
|
||||
if (!file->open(Core::IODevice::ReadOnly)) {
|
||||
dbgln("Could not open file");
|
||||
return nullptr;
|
||||
}
|
||||
auto buffer = file->read_all();
|
||||
return load_from_memory(buffer, index);
|
||||
}
|
||||
|
||||
RefPtr<Font> Font::load_from_memory(ByteBuffer& buffer, unsigned index)
|
||||
{
|
||||
if (buffer.size() < 4) {
|
||||
dbgln("Font file too small");
|
||||
return nullptr;
|
||||
}
|
||||
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)) {
|
||||
dbgln("Font file too small");
|
||||
return nullptr;
|
||||
}
|
||||
u32 offset = be_u32(buffer.offset_pointer((u32)Sizes::TTCHeaderV1 + sizeof(u32) * index));
|
||||
return load_from_offset(move(buffer), offset);
|
||||
}
|
||||
if (tag == tag_from_str("OTTO")) {
|
||||
dbgln("CFF fonts not supported yet");
|
||||
return nullptr;
|
||||
}
|
||||
if (tag != 0x00010000) {
|
||||
dbgln("Not a valid font");
|
||||
return nullptr;
|
||||
}
|
||||
return load_from_offset(move(buffer), 0);
|
||||
}
|
||||
|
||||
// FIXME: "loca" and "glyf" are not available for CFF fonts.
|
||||
RefPtr<Font> Font::load_from_offset(ByteBuffer&& buffer, u32 offset)
|
||||
{
|
||||
if (buffer.size() < offset + (u32)Sizes::OffsetTable) {
|
||||
dbgln("Font file too small");
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
Optional<ReadonlyBytes> opt_head_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<Head> opt_head = {};
|
||||
Optional<Hhea> opt_hhea = {};
|
||||
Optional<Maxp> opt_maxp = {};
|
||||
Optional<Hmtx> opt_hmtx = {};
|
||||
Optional<Cmap> opt_cmap = {};
|
||||
Optional<Loca> opt_loca = {};
|
||||
|
||||
auto num_tables = be_u16(buffer.offset_pointer(offset + (u32)Offsets::NumTables));
|
||||
if (buffer.size() < offset + (u32)Sizes::OffsetTable + num_tables * (u32)Sizes::TableRecord) {
|
||||
dbgln("Font file too small");
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
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)) {
|
||||
dbgln("Invalid table offset/length in font.");
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
if (buffer.size() < table_offset + table_length) {
|
||||
dbgln("Font file too small");
|
||||
return nullptr;
|
||||
}
|
||||
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("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;
|
||||
}
|
||||
}
|
||||
|
||||
if (!opt_head_slice.has_value() || !(opt_head = Head::from_slice(opt_head_slice.value())).has_value()) {
|
||||
dbgln("Could not load Head");
|
||||
return nullptr;
|
||||
}
|
||||
auto head = opt_head.value();
|
||||
|
||||
if (!opt_hhea_slice.has_value() || !(opt_hhea = Hhea::from_slice(opt_hhea_slice.value())).has_value()) {
|
||||
dbgln("Could not load Hhea");
|
||||
return nullptr;
|
||||
}
|
||||
auto hhea = opt_hhea.value();
|
||||
|
||||
if (!opt_maxp_slice.has_value() || !(opt_maxp = Maxp::from_slice(opt_maxp_slice.value())).has_value()) {
|
||||
dbgln("Could not load Maxp");
|
||||
return nullptr;
|
||||
}
|
||||
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()) {
|
||||
dbgln("Could not load Hmtx");
|
||||
return nullptr;
|
||||
}
|
||||
auto hmtx = opt_hmtx.value();
|
||||
|
||||
if (!opt_cmap_slice.has_value() || !(opt_cmap = Cmap::from_slice(opt_cmap_slice.value())).has_value()) {
|
||||
dbgln("Could not load Cmap");
|
||||
return nullptr;
|
||||
}
|
||||
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()) {
|
||||
dbgln("Could not load Loca");
|
||||
return nullptr;
|
||||
}
|
||||
auto loca = opt_loca.value();
|
||||
|
||||
if (!opt_glyf_slice.has_value()) {
|
||||
dbgln("Could not load Glyf");
|
||||
return nullptr;
|
||||
}
|
||||
auto glyf = Glyf(opt_glyf_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();
|
||||
if (subtable.platform_id() == 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(*new Font(move(buffer), move(head), move(hhea), move(maxp), move(hmtx), move(cmap), move(loca), move(glyf)));
|
||||
}
|
||||
|
||||
ScaledFontMetrics Font::metrics(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;
|
||||
auto advance_width_max = m_hhea.advance_width_max() * x_scale;
|
||||
return ScaledFontMetrics {
|
||||
.ascender = (int)roundf(ascender),
|
||||
.descender = (int)roundf(descender),
|
||||
.line_gap = (int)roundf(line_gap),
|
||||
.advance_width_max = (int)roundf(advance_width_max),
|
||||
};
|
||||
}
|
||||
|
||||
// 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),
|
||||
};
|
||||
}
|
||||
|
||||
// FIXME: "loca" and "glyf" are not available for CFF fonts.
|
||||
RefPtr<Gfx::Bitmap> Font::raster_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.raster(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();
|
||||
}
|
||||
|
||||
int ScaledFont::width(const StringView& string) const
|
||||
{
|
||||
Utf8View utf8 { string };
|
||||
return width(utf8);
|
||||
}
|
||||
|
||||
int ScaledFont::width(const Utf8View& utf8) const
|
||||
{
|
||||
int width = 0;
|
||||
for (u32 codepoint : utf8) {
|
||||
u32 glyph_id = glyph_id_for_codepoint(codepoint);
|
||||
auto metrics = glyph_metrics(glyph_id);
|
||||
width += metrics.advance_width;
|
||||
}
|
||||
return width;
|
||||
}
|
||||
|
||||
int ScaledFont::width(const Utf32View& utf32) const
|
||||
{
|
||||
int width = 0;
|
||||
for (size_t i = 0; i < utf32.length(); i++) {
|
||||
u32 glyph_id = glyph_id_for_codepoint(utf32.code_points()[i]);
|
||||
auto metrics = glyph_metrics(glyph_id);
|
||||
width += metrics.advance_width;
|
||||
}
|
||||
return width;
|
||||
}
|
||||
|
||||
RefPtr<Gfx::Bitmap> ScaledFont::raster_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->raster_glyph(glyph_id, m_x_scale, m_y_scale);
|
||||
m_cached_glyph_bitmaps.set(glyph_id, glyph_bitmap);
|
||||
return glyph_bitmap;
|
||||
}
|
||||
|
||||
}
|
140
Userland/Libraries/LibTTF/Font.h
Normal file
140
Userland/Libraries/LibTTF/Font.h
Normal file
|
@ -0,0 +1,140 @@
|
|||
/*
|
||||
* 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/ByteBuffer.h>
|
||||
#include <AK/HashMap.h>
|
||||
#include <AK/Noncopyable.h>
|
||||
#include <AK/RefCounted.h>
|
||||
#include <AK/StringView.h>
|
||||
#include <LibGfx/Bitmap.h>
|
||||
#include <LibGfx/Size.h>
|
||||
#include <LibTTF/Cmap.h>
|
||||
#include <LibTTF/Glyf.h>
|
||||
#include <LibTTF/Tables.h>
|
||||
|
||||
#define POINTS_PER_INCH 72.0f
|
||||
#define DEFAULT_DPI 96
|
||||
|
||||
namespace TTF {
|
||||
|
||||
struct ScaledFontMetrics {
|
||||
int ascender;
|
||||
int descender;
|
||||
int line_gap;
|
||||
int advance_width_max;
|
||||
|
||||
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 RefPtr<Font> load_from_file(const StringView& path, unsigned index = 0);
|
||||
static RefPtr<Font> load_from_memory(ByteBuffer&, 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;
|
||||
RefPtr<Gfx::Bitmap> raster_glyph(u32 glyph_id, float x_scale, float y_scale) const;
|
||||
u32 glyph_count() const;
|
||||
u16 units_per_em() const;
|
||||
u32 glyph_id_for_codepoint(u32 codepoint) const { return m_cmap.glyph_id_for_codepoint(codepoint); }
|
||||
|
||||
private:
|
||||
enum class Offsets {
|
||||
NumTables = 4,
|
||||
TableRecord_Offset = 8,
|
||||
TableRecord_Length = 12,
|
||||
};
|
||||
enum class Sizes {
|
||||
TTCHeaderV1 = 12,
|
||||
OffsetTable = 12,
|
||||
TableRecord = 16,
|
||||
};
|
||||
|
||||
static RefPtr<Font> load_from_offset(ByteBuffer&&, unsigned index = 0);
|
||||
Font(ByteBuffer&& buffer, Head&& head, Hhea&& hhea, Maxp&& maxp, Hmtx&& hmtx, Cmap&& cmap, Loca&& loca, Glyf&& glyf)
|
||||
: m_buffer(move(buffer))
|
||||
, m_head(move(head))
|
||||
, m_hhea(move(hhea))
|
||||
, m_maxp(move(maxp))
|
||||
, m_hmtx(move(hmtx))
|
||||
, m_loca(move(loca))
|
||||
, m_glyf(move(glyf))
|
||||
, m_cmap(move(cmap))
|
||||
{
|
||||
}
|
||||
|
||||
// This owns the font data
|
||||
ByteBuffer m_buffer;
|
||||
// These are stateful wrappers around non-owning slices
|
||||
Head m_head;
|
||||
Hhea m_hhea;
|
||||
Maxp m_maxp;
|
||||
Hmtx m_hmtx;
|
||||
Loca m_loca;
|
||||
Glyf m_glyf;
|
||||
Cmap m_cmap;
|
||||
};
|
||||
|
||||
class ScaledFont {
|
||||
public:
|
||||
ScaledFont(RefPtr<Font> font, float point_width, float point_height, unsigned dpi_x = DEFAULT_DPI, unsigned dpi_y = DEFAULT_DPI)
|
||||
: m_font(font)
|
||||
{
|
||||
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_codepoint(u32 codepoint) const { return m_font->glyph_id_for_codepoint(codepoint); }
|
||||
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> raster_glyph(u32 glyph_id) const;
|
||||
u32 glyph_count() const { return m_font->glyph_count(); }
|
||||
int width(const StringView&) const;
|
||||
int width(const Utf8View&) const;
|
||||
int width(const Utf32View&) const;
|
||||
|
||||
private:
|
||||
RefPtr<Font> m_font;
|
||||
float m_x_scale { 0.0 };
|
||||
float m_y_scale { 0.0 };
|
||||
mutable AK::HashMap<u32, RefPtr<Gfx::Bitmap>> m_cached_glyph_bitmaps;
|
||||
};
|
||||
|
||||
}
|
519
Userland/Libraries/LibTTF/Glyf.cpp
Normal file
519
Userland/Libraries/LibTTF/Glyf.cpp
Normal file
|
@ -0,0 +1,519 @@
|
|||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#include <LibGfx/Path.h>
|
||||
#include <LibGfx/Point.h>
|
||||
#include <LibTTF/Glyf.h>
|
||||
|
||||
namespace TTF {
|
||||
|
||||
extern u16 be_u16(const u8* ptr);
|
||||
extern u32 be_u32(const u8* ptr);
|
||||
extern i16 be_i16(const u8* ptr);
|
||||
extern float be_fword(const u8* 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(const 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 {
|
||||
TODO();
|
||||
}
|
||||
if (flags & (u16)CompositeGlyfFlags::UseMyMetrics) {
|
||||
TODO();
|
||||
}
|
||||
if (flags & (u16)CompositeGlyfFlags::ScaledComponentOffset) {
|
||||
TODO();
|
||||
}
|
||||
if (flags & (u16)CompositeGlyfFlags::UnscaledComponentOffset) {
|
||||
TODO();
|
||||
}
|
||||
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] = 0.0;
|
||||
}
|
||||
}
|
||||
|
||||
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 = Gfx::Bitmap::create(Gfx::BitmapFormat::RGBA32, m_size);
|
||||
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 < 0.0) {
|
||||
value = -value;
|
||||
}
|
||||
if (value > 1.0) {
|
||||
value = 1.0;
|
||||
}
|
||||
u8 alpha = value * 255.0;
|
||||
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() < 0.0) {
|
||||
p0.set_x(roundf(p0.x()));
|
||||
}
|
||||
if (p0.y() < 0.0) {
|
||||
p0.set_y(roundf(p0.y()));
|
||||
}
|
||||
if (p1.x() < 0.0) {
|
||||
p1.set_x(roundf(p1.x()));
|
||||
}
|
||||
if (p1.y() < 0.0) {
|
||||
p1.set_y(roundf(p1.y()));
|
||||
}
|
||||
|
||||
if (!(p0.x() >= 0.0 && p0.y() >= 0.0 && p0.x() <= m_size.width() && p0.y() <= m_size.height())) {
|
||||
dbgln("!P0({},{})", p0.x(), p0.y());
|
||||
return;
|
||||
}
|
||||
|
||||
if (!(p1.x() >= 0.0 && p1.y() >= 0.0 && p1.x() <= m_size.width() && p1.y() <= m_size.height())) {
|
||||
dbgln("!P1({},{})", p1.x(), p1.y());
|
||||
return;
|
||||
}
|
||||
|
||||
ASSERT(p0.x() >= 0.0 && p0.y() >= 0.0 && p0.x() <= m_size.width() && p0.y() <= m_size.height());
|
||||
ASSERT(p1.x() >= 0.0 && p1.y() >= 0.0 && 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 = floor(p0.y());
|
||||
u32 y1 = ceil(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 < 0.0) {
|
||||
x_next = 0.0;
|
||||
}
|
||||
float x0 = x_cur;
|
||||
float x1 = x_next;
|
||||
if (x1 < x0) {
|
||||
x1 = x_cur;
|
||||
x0 = x_next;
|
||||
}
|
||||
float x0_floor = floor(x0);
|
||||
float x1_ceil = ceil(x1);
|
||||
u32 x0i = x0_floor;
|
||||
|
||||
if (x1_ceil <= x0_floor + 1.0) {
|
||||
// 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) * 0.5) - x0_floor;
|
||||
m_data[line_offset + x0i] += directed_dy * (1.0 - area);
|
||||
m_data[line_offset + x0i + 1] += directed_dy * area;
|
||||
} else {
|
||||
float dydx = 1.0 / dxdy;
|
||||
float x0_right = 1.0 - (x0 - x0_floor);
|
||||
u32 x1_floor_i = floor(x1);
|
||||
float area_upto_here = 0.5 * x0_right * x0_right * dydx;
|
||||
m_data[line_offset + x0i] += direction * area_upto_here;
|
||||
for (u32 x = x0i + 1; x < x1_floor_i; x++) {
|
||||
x0_right += 1.0;
|
||||
float total_area_here = 0.5 * x0_right * x0_right * dydx;
|
||||
m_data[line_offset + x] += direction * (total_area_here - area_upto_here);
|
||||
area_upto_here = total_area_here;
|
||||
}
|
||||
m_data[line_offset + x1_floor_i] += direction * (dy - area_upto_here);
|
||||
}
|
||||
|
||||
x_cur = x_next;
|
||||
}
|
||||
}
|
||||
|
||||
Optional<Loca> Loca::from_slice(const 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
|
||||
{
|
||||
ASSERT(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:
|
||||
ASSERT_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
|
||||
static void get_ttglyph_offsets(const 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::raster_inner(Rasterizer& rasterizer, Gfx::AffineTransform& affine) 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, affine);
|
||||
|
||||
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();
|
||||
ASSERT(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::raster_simple(float x_scale, float y_scale) const
|
||||
{
|
||||
u32 width = (u32)(ceil((m_xmax - m_xmin) * x_scale)) + 2;
|
||||
u32 height = (u32)(ceil((m_ymax - m_ymin) * y_scale)) + 2;
|
||||
Rasterizer rasterizer(Gfx::IntSize(width, height));
|
||||
auto affine = Gfx::AffineTransform().scale(x_scale, -y_scale).translate(-m_xmin, -m_ymax);
|
||||
raster_inner(rasterizer, affine);
|
||||
return rasterizer.accumulate();
|
||||
}
|
||||
|
||||
Glyf::Glyph Glyf::glyph(u32 offset) const
|
||||
{
|
||||
ASSERT(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);
|
||||
}
|
||||
|
||||
}
|
176
Userland/Libraries/LibTTF/Glyf.h
Normal file
176
Userland/Libraries/LibTTF/Glyf.h
Normal file
|
@ -0,0 +1,176 @@
|
|||
/*
|
||||
* 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>
|
||||
#include <AK/Vector.h>
|
||||
#include <LibGfx/AffineTransform.h>
|
||||
#include <LibGfx/Bitmap.h>
|
||||
#include <LibTTF/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;
|
||||
AK::Vector<float> m_data;
|
||||
};
|
||||
|
||||
class Loca {
|
||||
public:
|
||||
static Optional<Loca> from_slice(const ReadonlyBytes&, u32 num_glyphs, IndexToLocFormat);
|
||||
u32 get_glyph_offset(u32 glyph_id) const;
|
||||
|
||||
private:
|
||||
Loca(const 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(const 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> raster(float x_scale, float y_scale, GlyphCb glyph_callback) const
|
||||
{
|
||||
switch (m_type) {
|
||||
case Type::Simple:
|
||||
return raster_simple(x_scale, y_scale);
|
||||
case Type::Composite:
|
||||
return raster_composite(x_scale, y_scale, glyph_callback);
|
||||
}
|
||||
ASSERT_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(const ReadonlyBytes& slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
Optional<Item> next();
|
||||
|
||||
private:
|
||||
ReadonlyBytes m_slice;
|
||||
bool m_has_more { true };
|
||||
u32 m_offset { 0 };
|
||||
};
|
||||
|
||||
void raster_inner(Rasterizer&, Gfx::AffineTransform&) const;
|
||||
RefPtr<Gfx::Bitmap> raster_simple(float x_scale, float y_scale) const;
|
||||
template<typename GlyphCb>
|
||||
RefPtr<Gfx::Bitmap> raster_composite(float x_scale, float y_scale, GlyphCb glyph_callback) const
|
||||
{
|
||||
u32 width = (u32)(ceil((m_xmax - m_xmin) * x_scale)) + 1;
|
||||
u32 height = (u32)(ceil((m_ymax - m_ymin) * y_scale)) + 1;
|
||||
Rasterizer rasterizer(Gfx::IntSize(width, height));
|
||||
auto affine = Gfx::AffineTransform().scale(x_scale, -y_scale).translate(-m_xmin, -m_ymax);
|
||||
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.raster_inner(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(const 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;
|
||||
};
|
||||
|
||||
}
|
149
Userland/Libraries/LibTTF/Tables.h
Normal file
149
Userland/Libraries/LibTTF/Tables.h
Normal file
|
@ -0,0 +1,149 @@
|
|||
/*
|
||||
* 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 {
|
||||
|
||||
enum class IndexToLocFormat {
|
||||
Offset16,
|
||||
Offset32,
|
||||
};
|
||||
|
||||
class Head {
|
||||
public:
|
||||
static Optional<Head> from_slice(const ReadonlyBytes&);
|
||||
u16 units_per_em() const;
|
||||
i16 xmin() const;
|
||||
i16 ymin() const;
|
||||
i16 xmax() const;
|
||||
i16 ymax() const;
|
||||
u16 lowest_recommended_ppem() const;
|
||||
IndexToLocFormat index_to_loc_format() const;
|
||||
|
||||
private:
|
||||
enum class Offsets {
|
||||
UnitsPerEM = 18,
|
||||
XMin = 36,
|
||||
YMin = 38,
|
||||
XMax = 40,
|
||||
YMax = 42,
|
||||
LowestRecPPEM = 46,
|
||||
IndexToLocFormat = 50,
|
||||
};
|
||||
enum class Sizes {
|
||||
Table = 54,
|
||||
};
|
||||
|
||||
Head(const ReadonlyBytes& slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
};
|
||||
|
||||
class Hhea {
|
||||
public:
|
||||
static Optional<Hhea> from_slice(const 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(const ReadonlyBytes& slice)
|
||||
: m_slice(slice)
|
||||
{
|
||||
}
|
||||
|
||||
ReadonlyBytes m_slice;
|
||||
};
|
||||
|
||||
class Maxp {
|
||||
public:
|
||||
static Optional<Maxp> from_slice(const ReadonlyBytes&);
|
||||
u16 num_glyphs() const;
|
||||
|
||||
private:
|
||||
enum class Offsets {
|
||||
NumGlyphs = 4
|
||||
};
|
||||
enum class Sizes {
|
||||
TableV0p5 = 6,
|
||||
};
|
||||
|
||||
Maxp(const 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(const 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(const 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 };
|
||||
};
|
||||
|
||||
}
|
Loading…
Add table
Add a link
Reference in a new issue