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https://github.com/LadybirdBrowser/ladybird.git
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f5e914fb9f
There's no need for this to be a virtual, it's just a font database lookup and can be done in the Font base class.
579 lines
18 KiB
C++
579 lines
18 KiB
C++
/*
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* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Checked.h>
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#include <AK/MappedFile.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 <LibGfx/FontDatabase.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 <LibTextCodec/Decoder.h>
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#include <math.h>
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#include <sys/mman.h>
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namespace TTF {
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u16 be_u16(u8 const*);
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u32 be_u32(u8 const*);
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i16 be_i16(u8 const*);
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float be_fword(u8 const*);
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u32 tag_from_str(char const*);
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u16 be_u16(u8 const* ptr)
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{
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return (((u16)ptr[0]) << 8) | ((u16)ptr[1]);
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}
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u32 be_u32(u8 const* ptr)
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{
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return (((u32)ptr[0]) << 24) | (((u32)ptr[1]) << 16) | (((u32)ptr[2]) << 8) | ((u32)ptr[3]);
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}
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i16 be_i16(u8 const* ptr)
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{
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return (((i16)ptr[0]) << 8) | ((i16)ptr[1]);
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}
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float be_fword(u8 const* ptr)
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{
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return (float)be_i16(ptr) / (float)(1 << 14);
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}
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u32 tag_from_str(char const* str)
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{
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return be_u32((u8 const*)str);
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}
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Optional<Head> Head::from_slice(ReadonlyBytes const& slice)
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{
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if (slice.size() < (size_t)Sizes::Table) {
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return {};
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}
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return Head(slice);
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}
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u16 Head::units_per_em() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::UnitsPerEM));
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}
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i16 Head::xmin() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::XMin));
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}
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i16 Head::ymin() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::YMin));
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}
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i16 Head::xmax() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::XMax));
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}
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i16 Head::ymax() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::YMax));
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}
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u16 Head::lowest_recommended_ppem() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::LowestRecPPEM));
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}
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IndexToLocFormat Head::index_to_loc_format() const
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{
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i16 raw = be_i16(m_slice.offset_pointer((u32)Offsets::IndexToLocFormat));
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switch (raw) {
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case 0:
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return IndexToLocFormat::Offset16;
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case 1:
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return IndexToLocFormat::Offset32;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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Optional<Hhea> Hhea::from_slice(ReadonlyBytes const& slice)
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{
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if (slice.size() < (size_t)Sizes::Table) {
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return {};
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}
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return Hhea(slice);
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}
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i16 Hhea::ascender() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::Ascender));
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}
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i16 Hhea::descender() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::Descender));
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}
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i16 Hhea::line_gap() const
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{
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return be_i16(m_slice.offset_pointer((u32)Offsets::LineGap));
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}
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u16 Hhea::advance_width_max() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::AdvanceWidthMax));
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}
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u16 Hhea::number_of_h_metrics() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::NumberOfHMetrics));
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}
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Optional<Maxp> Maxp::from_slice(ReadonlyBytes const& slice)
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{
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if (slice.size() < (size_t)Sizes::TableV0p5) {
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return {};
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}
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return Maxp(slice);
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}
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u16 Maxp::num_glyphs() const
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{
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return be_u16(m_slice.offset_pointer((u32)Offsets::NumGlyphs));
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}
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Optional<Hmtx> Hmtx::from_slice(ReadonlyBytes const& slice, u32 num_glyphs, u32 number_of_h_metrics)
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{
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if (slice.size() < number_of_h_metrics * (u32)Sizes::LongHorMetric + (num_glyphs - number_of_h_metrics) * (u32)Sizes::LeftSideBearing) {
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return {};
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}
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return Hmtx(slice, num_glyphs, number_of_h_metrics);
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}
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Optional<Name> Name::from_slice(ReadonlyBytes const& slice)
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{
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return Name(slice);
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}
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String Name::string_for_id(NameId id) const
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{
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auto num_entries = be_u16(m_slice.offset_pointer(2));
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auto string_offset = be_u16(m_slice.offset_pointer(4));
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Vector<int> valid_ids;
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for (int i = 0; i < num_entries; ++i) {
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auto this_id = be_u16(m_slice.offset_pointer(6 + i * 12 + 6));
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if (this_id == (u16)id)
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valid_ids.append(i);
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}
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if (valid_ids.is_empty())
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return String::empty();
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auto it = valid_ids.find_if([this](auto const& i) {
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// check if font has naming table for en-US language id
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auto platform = be_u16(m_slice.offset_pointer(6 + i * 12 + 0));
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auto language_id = be_u16(m_slice.offset_pointer(6 + i * 12 + 4));
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return (platform == (u16)Platform::Macintosh && language_id == (u16)MacintoshLanguage::English)
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|| (platform == (u16)Platform::Windows && language_id == (u16)WindowsLanguage::EnglishUnitedStates);
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});
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auto i = it != valid_ids.end() ? *it : valid_ids.first();
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auto platform = be_u16(m_slice.offset_pointer(6 + i * 12 + 0));
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auto length = be_u16(m_slice.offset_pointer(6 + i * 12 + 8));
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auto offset = be_u16(m_slice.offset_pointer(6 + i * 12 + 10));
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if (platform == (u16)Platform::Windows) {
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static auto& decoder = *TextCodec::decoder_for("utf-16be");
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return decoder.to_utf8(StringView { (char const*)m_slice.offset_pointer(string_offset + offset), length });
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}
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return String((char const*)m_slice.offset_pointer(string_offset + offset), length);
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}
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GlyphHorizontalMetrics Hmtx::get_glyph_horizontal_metrics(u32 glyph_id) const
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{
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VERIFY(glyph_id < m_num_glyphs);
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if (glyph_id < m_number_of_h_metrics) {
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auto offset = glyph_id * (u32)Sizes::LongHorMetric;
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u16 advance_width = be_u16(m_slice.offset_pointer(offset));
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i16 left_side_bearing = be_i16(m_slice.offset_pointer(offset + 2));
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return GlyphHorizontalMetrics {
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.advance_width = advance_width,
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.left_side_bearing = left_side_bearing,
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};
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}
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auto offset = m_number_of_h_metrics * (u32)Sizes::LongHorMetric + (glyph_id - m_number_of_h_metrics) * (u32)Sizes::LeftSideBearing;
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u16 advance_width = be_u16(m_slice.offset_pointer((m_number_of_h_metrics - 1) * (u32)Sizes::LongHorMetric));
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i16 left_side_bearing = be_i16(m_slice.offset_pointer(offset));
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return GlyphHorizontalMetrics {
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.advance_width = advance_width,
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.left_side_bearing = left_side_bearing,
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};
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}
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Result<NonnullRefPtr<Font>, String> Font::try_load_from_file(String path, unsigned index)
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{
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auto file_or_error = MappedFile::map(path);
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if (file_or_error.is_error())
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return String { file_or_error.error().string() };
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auto& file = *file_or_error.value();
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auto result = try_load_from_externally_owned_memory(file.bytes(), index);
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if (result.is_error())
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return result.error();
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auto& font = *result.value();
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font.m_mapped_file = file_or_error.release_value();
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return result;
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}
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Result<NonnullRefPtr<Font>, String> Font::try_load_from_externally_owned_memory(ReadonlyBytes buffer, unsigned index)
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{
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if (buffer.size() < 4)
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return String { "Font file too small" };
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u32 tag = be_u32(buffer.data());
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if (tag == tag_from_str("ttcf")) {
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// It's a font collection
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if (buffer.size() < (u32)Sizes::TTCHeaderV1 + sizeof(u32) * (index + 1))
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return String { "Font file too small" };
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u32 offset = be_u32(buffer.offset_pointer((u32)Sizes::TTCHeaderV1 + sizeof(u32) * index));
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return try_load_from_offset(move(buffer), offset);
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}
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if (tag == tag_from_str("OTTO"))
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return String { "CFF fonts not supported yet" };
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if (tag != 0x00010000)
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return String { "Not a valid font" };
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return try_load_from_offset(move(buffer), 0);
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}
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// FIXME: "loca" and "glyf" are not available for CFF fonts.
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Result<NonnullRefPtr<Font>, String> Font::try_load_from_offset(ReadonlyBytes buffer, u32 offset)
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{
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if (Checked<u32>::addition_would_overflow(offset, (u32)Sizes::OffsetTable))
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return String { "Invalid offset in font header" };
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if (buffer.size() < offset + (u32)Sizes::OffsetTable)
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return String { "Font file too small" };
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Optional<ReadonlyBytes> opt_head_slice = {};
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Optional<ReadonlyBytes> opt_name_slice = {};
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Optional<ReadonlyBytes> opt_hhea_slice = {};
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Optional<ReadonlyBytes> opt_maxp_slice = {};
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Optional<ReadonlyBytes> opt_hmtx_slice = {};
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Optional<ReadonlyBytes> opt_cmap_slice = {};
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Optional<ReadonlyBytes> opt_loca_slice = {};
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Optional<ReadonlyBytes> opt_glyf_slice = {};
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Optional<ReadonlyBytes> opt_os2_slice = {};
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Optional<Head> opt_head = {};
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Optional<Name> opt_name = {};
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Optional<Hhea> opt_hhea = {};
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Optional<Maxp> opt_maxp = {};
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Optional<Hmtx> opt_hmtx = {};
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Optional<Cmap> opt_cmap = {};
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Optional<Loca> opt_loca = {};
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Optional<OS2> opt_os2 = {};
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auto num_tables = be_u16(buffer.offset_pointer(offset + (u32)Offsets::NumTables));
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if (buffer.size() < offset + (u32)Sizes::OffsetTable + num_tables * (u32)Sizes::TableRecord)
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return String { "Font file too small" };
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for (auto i = 0; i < num_tables; i++) {
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u32 record_offset = offset + (u32)Sizes::OffsetTable + i * (u32)Sizes::TableRecord;
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u32 tag = be_u32(buffer.offset_pointer(record_offset));
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u32 table_offset = be_u32(buffer.offset_pointer(record_offset + (u32)Offsets::TableRecord_Offset));
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u32 table_length = be_u32(buffer.offset_pointer(record_offset + (u32)Offsets::TableRecord_Length));
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if (Checked<u32>::addition_would_overflow(table_offset, table_length))
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return String { "Invalid table offset/length in font." };
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if (buffer.size() < table_offset + table_length)
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return String { "Font file too small" };
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auto buffer_here = ReadonlyBytes(buffer.offset_pointer(table_offset), table_length);
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// Get the table offsets we need.
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if (tag == tag_from_str("head")) {
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opt_head_slice = buffer_here;
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} else if (tag == tag_from_str("name")) {
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opt_name_slice = buffer_here;
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} else if (tag == tag_from_str("hhea")) {
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opt_hhea_slice = buffer_here;
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} else if (tag == tag_from_str("maxp")) {
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opt_maxp_slice = buffer_here;
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} else if (tag == tag_from_str("hmtx")) {
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opt_hmtx_slice = buffer_here;
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} else if (tag == tag_from_str("cmap")) {
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opt_cmap_slice = buffer_here;
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} else if (tag == tag_from_str("loca")) {
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opt_loca_slice = buffer_here;
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} else if (tag == tag_from_str("glyf")) {
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opt_glyf_slice = buffer_here;
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} else if (tag == tag_from_str("OS/2")) {
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opt_os2_slice = buffer_here;
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}
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}
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if (!opt_head_slice.has_value() || !(opt_head = Head::from_slice(opt_head_slice.value())).has_value())
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return String { "Could not load Head" };
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auto head = opt_head.value();
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if (!opt_name_slice.has_value() || !(opt_name = Name::from_slice(opt_name_slice.value())).has_value())
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return String { "Could not load Name" };
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auto name = opt_name.value();
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if (!opt_hhea_slice.has_value() || !(opt_hhea = Hhea::from_slice(opt_hhea_slice.value())).has_value())
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return String { "Could not load Hhea" };
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auto hhea = opt_hhea.value();
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if (!opt_maxp_slice.has_value() || !(opt_maxp = Maxp::from_slice(opt_maxp_slice.value())).has_value())
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return String { "Could not load Maxp" };
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auto maxp = opt_maxp.value();
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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())
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return String { "Could not load Hmtx" };
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auto hmtx = opt_hmtx.value();
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if (!opt_cmap_slice.has_value() || !(opt_cmap = Cmap::from_slice(opt_cmap_slice.value())).has_value())
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return String { "Could not load Cmap" };
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auto cmap = opt_cmap.value();
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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())
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return String { "Could not load Loca" };
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auto loca = opt_loca.value();
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if (!opt_glyf_slice.has_value())
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return String { "Could not load Glyf" };
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auto glyf = Glyf(opt_glyf_slice.value());
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if (!opt_os2_slice.has_value())
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return String { "Could not load OS/2" };
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auto os2 = OS2(opt_os2_slice.value());
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// Select cmap table. FIXME: Do this better. Right now, just looks for platform "Windows"
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// and corresponding encoding "Unicode full repertoire", or failing that, "Unicode BMP"
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for (u32 i = 0; i < cmap.num_subtables(); i++) {
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auto opt_subtable = cmap.subtable(i);
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if (!opt_subtable.has_value()) {
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continue;
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}
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auto subtable = opt_subtable.value();
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if (subtable.platform_id() == Cmap::Subtable::Platform::Windows) {
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if (subtable.encoding_id() == (u16)Cmap::Subtable::WindowsEncoding::UnicodeFullRepertoire) {
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cmap.set_active_index(i);
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break;
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}
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if (subtable.encoding_id() == (u16)Cmap::Subtable::WindowsEncoding::UnicodeBMP) {
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cmap.set_active_index(i);
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break;
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}
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}
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}
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return adopt_ref(*new Font(move(buffer), move(head), move(name), move(hhea), move(maxp), move(hmtx), move(cmap), move(loca), move(glyf), move(os2)));
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}
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ScaledFontMetrics Font::metrics(float x_scale, float y_scale) const
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{
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auto ascender = m_hhea.ascender() * y_scale;
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auto descender = m_hhea.descender() * y_scale;
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auto line_gap = m_hhea.line_gap() * y_scale;
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auto advance_width_max = m_hhea.advance_width_max() * x_scale;
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return ScaledFontMetrics {
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.ascender = (int)roundf(ascender),
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.descender = (int)roundf(descender),
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.line_gap = (int)roundf(line_gap),
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.advance_width_max = (int)roundf(advance_width_max),
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};
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}
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// FIXME: "loca" and "glyf" are not available for CFF fonts.
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ScaledGlyphMetrics Font::glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const
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{
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if (glyph_id >= glyph_count()) {
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glyph_id = 0;
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}
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auto horizontal_metrics = m_hmtx.get_glyph_horizontal_metrics(glyph_id);
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auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
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auto glyph = m_glyf.glyph(glyph_offset);
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int ascender = glyph.ascender();
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int descender = glyph.descender();
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return ScaledGlyphMetrics {
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.ascender = (int)roundf(ascender * y_scale),
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.descender = (int)roundf(descender * y_scale),
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.advance_width = (int)roundf(horizontal_metrics.advance_width * x_scale),
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.left_side_bearing = (int)roundf(horizontal_metrics.left_side_bearing * x_scale),
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};
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}
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// FIXME: "loca" and "glyf" are not available for CFF fonts.
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RefPtr<Gfx::Bitmap> Font::rasterize_glyph(u32 glyph_id, float x_scale, float y_scale) const
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{
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if (glyph_id >= glyph_count()) {
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glyph_id = 0;
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}
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auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
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auto glyph = m_glyf.glyph(glyph_offset);
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return glyph.rasterize(m_os2.typographic_ascender(), m_os2.typographic_descender(), x_scale, y_scale, [&](u16 glyph_id) {
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if (glyph_id >= glyph_count()) {
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glyph_id = 0;
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}
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auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
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return m_glyf.glyph(glyph_offset);
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});
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}
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u32 Font::glyph_count() const
|
|
{
|
|
return m_maxp.num_glyphs();
|
|
}
|
|
|
|
u16 Font::units_per_em() const
|
|
{
|
|
return m_head.units_per_em();
|
|
}
|
|
|
|
String Font::family() const
|
|
{
|
|
auto string = m_name.typographic_family_name();
|
|
if (!string.is_empty())
|
|
return string;
|
|
return m_name.family_name();
|
|
}
|
|
|
|
String Font::variant() const
|
|
{
|
|
auto string = m_name.typographic_subfamily_name();
|
|
if (!string.is_empty())
|
|
return string;
|
|
return m_name.subfamily_name();
|
|
}
|
|
|
|
u16 Font::weight() const
|
|
{
|
|
// FIXME: This is pretty naive, read weight from the actual font table(s)
|
|
auto variant_name = variant();
|
|
|
|
if (variant_name == "Thin")
|
|
return 100;
|
|
if (variant_name == "Extra Light")
|
|
return 200;
|
|
if (variant_name == "Light")
|
|
return 300;
|
|
if (variant_name == "Regular")
|
|
return 400;
|
|
if (variant_name == "Medium")
|
|
return 500;
|
|
if (variant_name == "Semi Bold")
|
|
return 600;
|
|
if (variant_name == "Bold")
|
|
return 700;
|
|
if (variant_name == "Extra Bold")
|
|
return 800;
|
|
if (variant_name == "Black")
|
|
return 900;
|
|
if (variant_name == "Extra Black")
|
|
return 950;
|
|
|
|
return 400;
|
|
}
|
|
|
|
bool Font::is_fixed_width() const
|
|
{
|
|
// FIXME: Read this information from the font file itself.
|
|
// FIXME: Although, it appears some application do similar hacks
|
|
return glyph_metrics(glyph_id_for_code_point('.'), 1, 1).advance_width == glyph_metrics(glyph_id_for_code_point('X'), 1, 1).advance_width;
|
|
}
|
|
|
|
int ScaledFont::width(StringView const& view) const { return unicode_view_width(Utf8View(view)); }
|
|
int ScaledFont::width(Utf8View const& view) const { return unicode_view_width(view); }
|
|
int ScaledFont::width(Utf32View const& view) const { return unicode_view_width(view); }
|
|
|
|
template<typename T>
|
|
ALWAYS_INLINE int ScaledFont::unicode_view_width(T const& view) const
|
|
{
|
|
if (view.is_empty())
|
|
return 0;
|
|
int width = 0;
|
|
int longest_width = 0;
|
|
for (auto code_point : view) {
|
|
if (code_point == '\n' || code_point == '\r') {
|
|
longest_width = max(width, longest_width);
|
|
width = 0;
|
|
continue;
|
|
}
|
|
u32 glyph_id = glyph_id_for_code_point(code_point);
|
|
auto metrics = glyph_metrics(glyph_id);
|
|
width += metrics.advance_width;
|
|
}
|
|
longest_width = max(width, longest_width);
|
|
return longest_width;
|
|
}
|
|
|
|
RefPtr<Gfx::Bitmap> ScaledFont::rasterize_glyph(u32 glyph_id) const
|
|
{
|
|
auto glyph_iterator = m_cached_glyph_bitmaps.find(glyph_id);
|
|
if (glyph_iterator != m_cached_glyph_bitmaps.end())
|
|
return glyph_iterator->value;
|
|
|
|
auto glyph_bitmap = m_font->rasterize_glyph(glyph_id, m_x_scale, m_y_scale);
|
|
m_cached_glyph_bitmaps.set(glyph_id, glyph_bitmap);
|
|
return glyph_bitmap;
|
|
}
|
|
|
|
Gfx::Glyph ScaledFont::glyph(u32 code_point) const
|
|
{
|
|
auto id = glyph_id_for_code_point(code_point);
|
|
auto bitmap = rasterize_glyph(id);
|
|
auto metrics = glyph_metrics(id);
|
|
return Gfx::Glyph(bitmap, metrics.left_side_bearing, metrics.advance_width, metrics.ascender);
|
|
}
|
|
|
|
u8 ScaledFont::glyph_width(size_t code_point) const
|
|
{
|
|
auto id = glyph_id_for_code_point(code_point);
|
|
auto metrics = glyph_metrics(id);
|
|
return metrics.advance_width;
|
|
}
|
|
|
|
int ScaledFont::glyph_or_emoji_width(u32 code_point) const
|
|
{
|
|
auto id = glyph_id_for_code_point(code_point);
|
|
auto metrics = glyph_metrics(id);
|
|
return metrics.advance_width;
|
|
}
|
|
|
|
u8 ScaledFont::glyph_fixed_width() const
|
|
{
|
|
return glyph_metrics(glyph_id_for_code_point(' ')).advance_width;
|
|
}
|
|
|
|
i16 OS2::typographic_ascender() const
|
|
{
|
|
return be_i16(m_slice.offset_pointer((u32)Offsets::TypographicAscender));
|
|
}
|
|
|
|
i16 OS2::typographic_descender() const
|
|
{
|
|
return be_i16(m_slice.offset_pointer((u32)Offsets::TypographicDescender));
|
|
}
|
|
|
|
i16 OS2::typographic_line_gap() const
|
|
{
|
|
return be_i16(m_slice.offset_pointer((u32)Offsets::TypographicLineGap));
|
|
}
|
|
|
|
}
|