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@@ -7,9 +7,7 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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-#include <AK/BinarySearch.h>
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#include <AK/Checked.h>
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-#include <AK/Debug.h>
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#include <AK/MemoryStream.h>
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#include <AK/Try.h>
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#include <LibCore/MappedFile.h>
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@@ -20,7 +18,6 @@
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#include <LibGfx/Font/OpenType/Glyf.h>
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#include <LibGfx/Font/OpenType/Tables.h>
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#include <LibGfx/ImageFormats/PNGLoader.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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@@ -57,301 +54,6 @@ u32 tag_from_str(char const* str)
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return be_u32((u8 const*)str);
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}
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-Optional<Head> Head::from_slice(ReadonlyBytes slice)
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-{
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- if (slice.size() < sizeof(FontHeaderTable)) {
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- return {};
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- }
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- return Head(slice);
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-}
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-
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-u16 Head::units_per_em() const
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-{
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- return header().units_per_em;
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-}
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-
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-i16 Head::xmin() const
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-{
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- return header().x_min;
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-}
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-
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-i16 Head::ymin() const
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-{
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- return header().y_min;
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-}
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-
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-i16 Head::xmax() const
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-{
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- return header().x_max;
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-}
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-
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-i16 Head::ymax() const
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-{
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- return header().y_max;
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-}
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-
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-u16 Head::style() const
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-{
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- return header().mac_style;
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-}
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-
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-u16 Head::lowest_recommended_ppem() const
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-{
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- return header().lowest_rec_ppem;
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-}
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-
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-IndexToLocFormat Head::index_to_loc_format() const
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-{
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- switch (header().index_to_loc_format) {
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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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-
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-Optional<Hhea> Hhea::from_slice(ReadonlyBytes slice)
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-{
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- if (slice.size() < sizeof(HorizontalHeaderTable)) {
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- return {};
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- }
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- return Hhea(slice);
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-}
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-
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-i16 Hhea::ascender() const
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-{
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- return header().ascender;
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-}
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-
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-i16 Hhea::descender() const
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-{
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- return header().descender;
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-}
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-
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-i16 Hhea::line_gap() const
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-{
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- return header().line_gap;
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-}
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-
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-u16 Hhea::advance_width_max() const
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-{
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- return header().advance_width_max;
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-}
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-
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-u16 Hhea::number_of_h_metrics() const
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-{
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- return header().number_of_h_metrics;
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-}
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-
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-Optional<Maxp> Maxp::from_slice(ReadonlyBytes slice)
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-{
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- if (slice.size() < sizeof(MaximumProfileVersion0_5)) {
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- return {};
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- }
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- return Maxp(slice);
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-}
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-
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-u16 Maxp::num_glyphs() const
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-{
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- return header().num_glyphs;
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-}
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-
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-Optional<Hmtx> Hmtx::from_slice(ReadonlyBytes slice, u32 num_glyphs, u32 number_of_h_metrics)
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-{
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- if (slice.size() < number_of_h_metrics * sizeof(LongHorMetric) + (num_glyphs - number_of_h_metrics) * sizeof(u16)) {
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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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-
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-Optional<Name> Name::from_slice(ReadonlyBytes slice)
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-{
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- return Name(slice);
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-}
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-
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-ErrorOr<Kern> Kern::from_slice(ReadonlyBytes slice)
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-{
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- if (slice.size() < sizeof(Header))
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- return Error::from_string_literal("Invalid kern table header");
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-
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- // We only support the old (2x u16) version of the header
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- auto const& header = *bit_cast<Header const*>(slice.data());
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- auto version = header.version;
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- auto number_of_subtables = header.n_tables;
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- if (version != 0)
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- return Error::from_string_literal("Unsupported kern table version");
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- if (number_of_subtables == 0)
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- return Error::from_string_literal("Kern table does not contain any subtables");
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-
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- // Read all subtable offsets
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- auto subtable_offsets = TRY(FixedArray<size_t>::create(number_of_subtables));
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- size_t offset = sizeof(Header);
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- for (size_t i = 0; i < number_of_subtables; ++i) {
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- if (slice.size() < offset + sizeof(SubtableHeader))
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- return Error::from_string_literal("Invalid kern subtable header");
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- auto const& subtable_header = *bit_cast<SubtableHeader const*>(slice.offset_pointer(offset));
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- subtable_offsets[i] = offset;
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- offset += subtable_header.length;
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- }
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-
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- return Kern(slice, move(subtable_offsets));
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-}
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-
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-i16 Kern::get_glyph_kerning(u16 left_glyph_id, u16 right_glyph_id) const
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-{
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- VERIFY(left_glyph_id > 0 && right_glyph_id > 0);
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-
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- i16 glyph_kerning = 0;
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- for (auto subtable_offset : m_subtable_offsets) {
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- auto subtable_slice = m_slice.slice(subtable_offset);
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- auto const& subtable_header = *bit_cast<SubtableHeader const*>(subtable_slice.data());
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-
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- auto version = subtable_header.version;
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- auto length = subtable_header.length;
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- auto coverage = subtable_header.coverage;
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-
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- if (version != 0) {
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- dbgln("OpenType::Kern: unsupported subtable version {}", version);
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- continue;
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- }
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-
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- if (subtable_slice.size() < length) {
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- dbgln("OpenType::Kern: subtable has an invalid size {}", length);
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- continue;
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- }
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-
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- auto is_horizontal = (coverage & (1 << 0)) > 0;
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- auto is_minimum = (coverage & (1 << 1)) > 0;
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- auto is_cross_stream = (coverage & (1 << 2)) > 0;
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- auto is_override = (coverage & (1 << 3)) > 0;
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- auto reserved_bits = (coverage & 0xF0);
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- auto format = (coverage & 0xFF00) >> 8;
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-
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- // FIXME: implement support for these features
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- if (!is_horizontal || is_minimum || is_cross_stream || (reserved_bits > 0)) {
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- dbgln("OpenType::Kern: FIXME: implement missing feature support for subtable");
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- continue;
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- }
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-
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- // FIXME: implement support for subtable formats other than 0
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- Optional<i16> subtable_kerning;
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- switch (format) {
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- case 0:
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- subtable_kerning = read_glyph_kerning_format0(subtable_slice.slice(sizeof(SubtableHeader)), left_glyph_id, right_glyph_id);
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- break;
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- default:
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- dbgln("OpenType::Kern: FIXME: subtable format {} is unsupported", format);
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- continue;
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- }
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- if (!subtable_kerning.has_value())
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- continue;
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- auto kerning_value = subtable_kerning.release_value();
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-
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- if (is_override)
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- glyph_kerning = kerning_value;
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- else
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- glyph_kerning += kerning_value;
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- }
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- return glyph_kerning;
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-}
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-
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-Optional<i16> Kern::read_glyph_kerning_format0(ReadonlyBytes slice, u16 left_glyph_id, u16 right_glyph_id)
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-{
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- if (slice.size() < sizeof(Format0))
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- return {};
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-
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- auto const& format0 = *bit_cast<Format0 const*>(slice.data());
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- u16 number_of_pairs = format0.n_pairs;
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- u16 search_range = format0.search_range;
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- u16 entry_selector = format0.entry_selector;
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- u16 range_shift = format0.range_shift;
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-
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- // Sanity checks for this table format
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- auto pairs_in_search_range = search_range / sizeof(Format0Pair);
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- if (number_of_pairs == 0)
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- return {};
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- if (pairs_in_search_range > number_of_pairs)
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- return {};
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- if ((1 << entry_selector) * sizeof(Format0Pair) != search_range)
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- return {};
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- if ((number_of_pairs - pairs_in_search_range) * sizeof(Format0Pair) != range_shift)
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- return {};
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-
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- // FIXME: implement a possibly slightly more efficient binary search using the parameters above
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- ReadonlySpan<Format0Pair> pairs { bit_cast<Format0Pair const*>(slice.slice(sizeof(Format0)).data()), number_of_pairs };
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-
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- // The left and right halves of the kerning pair make an unsigned 32-bit number, which is then used to order the kerning pairs numerically.
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- auto needle = (static_cast<u32>(left_glyph_id) << 16u) | static_cast<u32>(right_glyph_id);
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- auto* pair = binary_search(pairs, nullptr, nullptr, [&](void*, Format0Pair const& pair) {
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- auto as_u32 = (static_cast<u32>(pair.left) << 16u) | static_cast<u32>(pair.right);
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- return needle - as_u32;
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- });
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-
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- if (!pair)
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- return 0;
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- return pair->value;
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-}
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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 const count = header().count;
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- auto const storage_offset = header().storage_offset;
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-
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- Vector<int> valid_ids;
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-
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- for (size_t i = 0; i < count; ++i) {
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- auto this_id = header().name_record[i].name_id;
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- if (this_id == to_underlying(id))
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- valid_ids.append(i);
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- }
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-
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- if (valid_ids.is_empty())
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- return String {};
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-
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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 const& name_record = header().name_record[i];
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- auto const platform_id = name_record.platform_id;
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- auto const language_id = name_record.language_id;
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- return (platform_id == to_underlying(Platform::Macintosh) && language_id == to_underlying(MacintoshLanguage::English))
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- || (platform_id == to_underlying(Platform::Windows) && language_id == to_underlying(WindowsLanguage::EnglishUnitedStates));
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- });
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- auto i = it != valid_ids.end() ? *it : valid_ids.first();
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-
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- auto const& name_record = header().name_record[i];
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-
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- auto const platform_id = name_record.platform_id;
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- auto const length = name_record.length;
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- auto const offset = name_record.string_offset;
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-
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- if (platform_id == to_underlying(Platform::Windows)) {
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- static auto& decoder = *TextCodec::decoder_for("utf-16be"sv);
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- return decoder.to_utf8(StringView { (char const*)m_slice.offset(storage_offset + offset), length }).release_value_but_fixme_should_propagate_errors();
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- }
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-
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- return String::from_utf8(m_slice.slice(storage_offset + offset, length)).release_value_but_fixme_should_propagate_errors();
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-}
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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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- auto const* long_hor_metrics = bit_cast<LongHorMetric const*>(m_slice.data());
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- if (glyph_id < m_number_of_h_metrics) {
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- return GlyphHorizontalMetrics {
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- .advance_width = static_cast<u16>(long_hor_metrics[glyph_id].advance_width),
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- .left_side_bearing = static_cast<i16>(long_hor_metrics[glyph_id].lsb),
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- };
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- }
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-
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- auto const* left_side_bearings = bit_cast<BigEndian<u16> const*>(m_slice.offset(m_number_of_h_metrics * sizeof(LongHorMetric)));
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- return GlyphHorizontalMetrics {
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- .advance_width = static_cast<u16>(long_hor_metrics[m_number_of_h_metrics - 1].advance_width),
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- .left_side_bearing = static_cast<i16>(left_side_bearings[glyph_id - m_number_of_h_metrics]),
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- };
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-}
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-
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ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_resource(Core::Resource const& resource, unsigned index)
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{
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auto font = TRY(try_load_from_externally_owned_memory(resource.data(), index));
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@@ -856,48 +558,6 @@ bool Font::is_fixed_width() const
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return glyph_metrics(glyph_id_for_code_point('.'), 1, 1, 1, 1).advance_width == glyph_metrics(glyph_id_for_code_point('X'), 1, 1, 1, 1).advance_width;
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}
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-u16 OS2::weight_class() const
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-{
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- return header().us_weight_class;
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-}
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-
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-u16 OS2::width_class() const
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-{
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- return header().us_width_class;
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-}
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-
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-u16 OS2::selection() const
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-{
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- return header().fs_selection;
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-}
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-
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-i16 OS2::typographic_ascender() const
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-{
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- return header().s_typo_ascender;
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-}
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-
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-i16 OS2::typographic_descender() const
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-{
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- return header().s_typo_descender;
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-}
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-
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-i16 OS2::typographic_line_gap() const
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-{
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- return header().s_typo_line_gap;
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-}
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-
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-bool OS2::use_typographic_metrics() const
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-{
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- return header().fs_selection & 0x80;
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-}
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-
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-Optional<i16> OS2::x_height() const
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-{
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- if (header().version < 2)
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- return {};
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- return header_v2().sx_height;
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-}
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-
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Optional<ReadonlyBytes> Font::font_program() const
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{
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if (m_fpgm.has_value())
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@@ -958,88 +618,11 @@ void Font::populate_glyph_page(GlyphPage& glyph_page, size_t page_index) const
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glyph_page.glyph_ids[i] = m_cmap.glyph_id_for_code_point(code_point);
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}
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}
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-
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-ErrorOr<CBLC> CBLC::from_slice(ReadonlyBytes slice)
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-{
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- if (slice.size() < sizeof(CblcHeader))
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- return Error::from_string_literal("CBLC table too small");
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- auto const& header = *bit_cast<CblcHeader const*>(slice.data());
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-
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- size_t num_sizes = header.num_sizes;
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- Checked<size_t> size_used_by_bitmap_sizes = num_sizes;
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- size_used_by_bitmap_sizes *= sizeof(BitmapSize);
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- if (size_used_by_bitmap_sizes.has_overflow())
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- return Error::from_string_literal("Integer overflow in CBLC table");
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-
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- Checked<size_t> total_size = sizeof(CblcHeader);
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- total_size += size_used_by_bitmap_sizes;
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- if (total_size.has_overflow())
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- return Error::from_string_literal("Integer overflow in CBLC table");
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-
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- if (slice.size() < total_size)
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- return Error::from_string_literal("CBLC table too small");
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-
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- return CBLC { slice };
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-}
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-
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-Optional<CBLC::BitmapSize const&> CBLC::bitmap_size_for_glyph_id(u32 glyph_id) const
|
|
|
-{
|
|
|
- for (auto const& bitmap_size : this->bitmap_sizes()) {
|
|
|
- if (glyph_id >= bitmap_size.start_glyph_index && glyph_id <= bitmap_size.end_glyph_index) {
|
|
|
- return bitmap_size;
|
|
|
- }
|
|
|
- }
|
|
|
- return {};
|
|
|
-}
|
|
|
-
|
|
|
-ErrorOr<CBDT> CBDT::from_slice(ReadonlyBytes slice)
|
|
|
-{
|
|
|
- if (slice.size() < sizeof(CbdtHeader))
|
|
|
- return Error::from_string_literal("CBDT table too small");
|
|
|
- return CBDT { slice };
|
|
|
-}
|
|
|
-
|
|
|
bool Font::has_color_bitmaps() const
|
|
|
{
|
|
|
return m_cblc.has_value() && m_cbdt.has_value();
|
|
|
}
|
|
|
|
|
|
-Optional<EBLC::IndexSubHeader const&> CBLC::index_subtable_for_glyph_id(u32 glyph_id, u16& first_glyph_index, u16& last_glyph_index) const
|
|
|
-{
|
|
|
- auto maybe_bitmap_size = bitmap_size_for_glyph_id(glyph_id);
|
|
|
- if (!maybe_bitmap_size.has_value()) {
|
|
|
- return {};
|
|
|
- }
|
|
|
- auto const& bitmap_size = maybe_bitmap_size.value();
|
|
|
-
|
|
|
- Checked<size_t> required_size = static_cast<u32>(bitmap_size.index_subtable_array_offset);
|
|
|
- required_size += bitmap_size.index_tables_size;
|
|
|
-
|
|
|
- if (m_slice.size() < required_size) {
|
|
|
- dbgln("CBLC index subtable array goes out of bounds");
|
|
|
- return {};
|
|
|
- }
|
|
|
-
|
|
|
- auto index_subtables_slice = m_slice.slice(bitmap_size.index_subtable_array_offset, bitmap_size.index_tables_size);
|
|
|
- ReadonlySpan<EBLC::IndexSubTableArray> index_subtable_arrays {
|
|
|
- bit_cast<EBLC::IndexSubTableArray const*>(index_subtables_slice.data()), bitmap_size.number_of_index_subtables
|
|
|
- };
|
|
|
-
|
|
|
- EBLC::IndexSubTableArray const* index_subtable_array = nullptr;
|
|
|
- for (auto const& array : index_subtable_arrays) {
|
|
|
- if (glyph_id >= array.first_glyph_index && glyph_id <= array.last_glyph_index)
|
|
|
- index_subtable_array = &array;
|
|
|
- }
|
|
|
- if (!index_subtable_array) {
|
|
|
- return {};
|
|
|
- }
|
|
|
-
|
|
|
- auto index_subtable_slice = m_slice.slice(bitmap_size.index_subtable_array_offset + index_subtable_array->additional_offset_to_index_subtable);
|
|
|
- first_glyph_index = index_subtable_array->first_glyph_index;
|
|
|
- last_glyph_index = index_subtable_array->last_glyph_index;
|
|
|
- return *bit_cast<EBLC::IndexSubHeader const*>(index_subtable_slice.data());
|
|
|
-}
|
|
|
-
|
|
|
RefPtr<Gfx::Bitmap> Font::color_bitmap(u32 glyph_id) const
|
|
|
{
|
|
|
return embedded_bitmap_data_for_glyph(glyph_id).visit(
|
|
|
@@ -1059,251 +642,4 @@ RefPtr<Gfx::Bitmap> Font::color_bitmap(u32 glyph_id) const
|
|
|
});
|
|
|
}
|
|
|
|
|
|
-Optional<i16> GPOS::glyph_kerning(u16 left_glyph_id, u16 right_glyph_id) const
|
|
|
-{
|
|
|
- auto read_value_record = [&](u16 value_format, FixedMemoryStream& stream) -> ValueRecord {
|
|
|
- ValueRecord value_record;
|
|
|
- if (value_format & static_cast<i16>(ValueFormat::X_PLACEMENT))
|
|
|
- value_record.x_placement = stream.read_value<BigEndian<i16>>().release_value_but_fixme_should_propagate_errors();
|
|
|
- if (value_format & static_cast<i16>(ValueFormat::Y_PLACEMENT))
|
|
|
- value_record.y_placement = stream.read_value<BigEndian<i16>>().release_value_but_fixme_should_propagate_errors();
|
|
|
- if (value_format & static_cast<i16>(ValueFormat::X_ADVANCE))
|
|
|
- value_record.x_advance = stream.read_value<BigEndian<i16>>().release_value_but_fixme_should_propagate_errors();
|
|
|
- if (value_format & static_cast<i16>(ValueFormat::Y_ADVANCE))
|
|
|
- value_record.y_advance = stream.read_value<BigEndian<i16>>().release_value_but_fixme_should_propagate_errors();
|
|
|
- if (value_format & static_cast<i16>(ValueFormat::X_PLACEMENT_DEVICE))
|
|
|
- value_record.x_placement_device_offset = stream.read_value<Offset16>().release_value_but_fixme_should_propagate_errors();
|
|
|
- if (value_format & static_cast<i16>(ValueFormat::Y_PLACEMENT_DEVICE))
|
|
|
- value_record.y_placement_device_offset = stream.read_value<Offset16>().release_value_but_fixme_should_propagate_errors();
|
|
|
- if (value_format & static_cast<i16>(ValueFormat::X_ADVANCE_DEVICE))
|
|
|
- value_record.x_advance_device_offset = stream.read_value<Offset16>().release_value_but_fixme_should_propagate_errors();
|
|
|
- if (value_format & static_cast<i16>(ValueFormat::Y_ADVANCE_DEVICE))
|
|
|
- value_record.y_advance_device_offset = stream.read_value<Offset16>().release_value_but_fixme_should_propagate_errors();
|
|
|
- return value_record;
|
|
|
- };
|
|
|
-
|
|
|
- auto const& header = this->header();
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "GPOS header:");
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " Version: {}.{}", header.major_version, header.minor_version);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " Feature list offset: {}", header.feature_list_offset);
|
|
|
-
|
|
|
- // FIXME: Make sure everything is bounds-checked appropriately.
|
|
|
-
|
|
|
- auto feature_list_slice = m_slice.slice(header.feature_list_offset);
|
|
|
- if (feature_list_slice.size() < sizeof(FeatureList)) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "GPOS table feature list slice is too small");
|
|
|
- return {};
|
|
|
- }
|
|
|
- auto const& feature_list = *bit_cast<FeatureList const*>(feature_list_slice.data());
|
|
|
-
|
|
|
- auto lookup_list_slice = m_slice.slice(header.lookup_list_offset);
|
|
|
- if (lookup_list_slice.size() < sizeof(LookupList)) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "GPOS table lookup list slice is too small");
|
|
|
- return {};
|
|
|
- }
|
|
|
- auto const& lookup_list = *bit_cast<LookupList const*>(lookup_list_slice.data());
|
|
|
-
|
|
|
- Optional<Offset16> kern_feature_offset;
|
|
|
- for (size_t i = 0; i < feature_list.feature_count; ++i) {
|
|
|
- auto const& feature_record = feature_list.feature_records[i];
|
|
|
- if (feature_record.feature_tag == tag_from_str("kern")) {
|
|
|
- kern_feature_offset = feature_record.feature_offset;
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (!kern_feature_offset.has_value()) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "No 'kern' feature found in GPOS table");
|
|
|
- return {};
|
|
|
- }
|
|
|
-
|
|
|
- auto feature_slice = feature_list_slice.slice(kern_feature_offset.value());
|
|
|
- auto const& feature = *bit_cast<Feature const*>(feature_slice.data());
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Feature:");
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " featureParamsOffset: {}", feature.feature_params_offset);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " lookupIndexCount: {}", feature.lookup_index_count);
|
|
|
-
|
|
|
- for (size_t i = 0; i < feature.lookup_index_count; ++i) {
|
|
|
- auto lookup_index = feature.lookup_list_indices[i];
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Lookup index: {}", lookup_index);
|
|
|
- auto lookup_slice = lookup_list_slice.slice(lookup_list.lookup_offsets[lookup_index]);
|
|
|
- auto const& lookup = *bit_cast<Lookup const*>(lookup_slice.data());
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Lookup:");
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " lookupType: {}", lookup.lookup_type);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " lookupFlag: {}", lookup.lookup_flag);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " subtableCount: {}", lookup.subtable_count);
|
|
|
-
|
|
|
- // NOTE: We only support lookup type 2 (Pair adjustment) at the moment.
|
|
|
- if (lookup.lookup_type != 2) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "FIXME: Implement GPOS lookup type {}", lookup.lookup_type);
|
|
|
- continue;
|
|
|
- }
|
|
|
-
|
|
|
- for (size_t j = 0; j < lookup.subtable_count; ++j) {
|
|
|
- auto pair_pos_format_offset = lookup.subtable_offsets[j];
|
|
|
- auto pair_pos_format_slice = lookup_slice.slice(pair_pos_format_offset);
|
|
|
-
|
|
|
- auto const& pair_pos_format = *bit_cast<BigEndian<u16> const*>(pair_pos_format_slice.data());
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "PairPosFormat{}", pair_pos_format);
|
|
|
-
|
|
|
- if (pair_pos_format == 1) {
|
|
|
- auto const& pair_pos_format1 = *bit_cast<GPOS::PairPosFormat1 const*>(pair_pos_format_slice.data());
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " posFormat: {}", pair_pos_format1.pos_format);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " valueFormat1: {}", pair_pos_format1.value_format1);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " valueFormat2: {}", pair_pos_format1.value_format2);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " pairSetCount: {}", pair_pos_format1.pair_set_count);
|
|
|
-
|
|
|
- auto get_coverage_index = [&](u16 glyph_id, Offset16 coverage_format_offset) -> Optional<u16> {
|
|
|
- auto coverage_format_slice = pair_pos_format_slice.slice(coverage_format_offset);
|
|
|
- auto const& coverage_format = *bit_cast<BigEndian<u16> const*>(coverage_format_slice.data());
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Coverage table format: {}", coverage_format);
|
|
|
-
|
|
|
- if (coverage_format == 1) {
|
|
|
- auto const& coverage_format1 = *bit_cast<CoverageFormat1 const*>(coverage_format_slice.data());
|
|
|
-
|
|
|
- for (size_t k = 0; k < coverage_format1.glyph_count; ++k)
|
|
|
- if (coverage_format1.glyph_array[k] == glyph_id)
|
|
|
- return k;
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Glyph ID {} not covered", glyph_id);
|
|
|
- return {};
|
|
|
- }
|
|
|
-
|
|
|
- else if (coverage_format == 2) {
|
|
|
- auto const& coverage_format2 = *bit_cast<CoverageFormat2 const*>(coverage_format_slice.data());
|
|
|
-
|
|
|
- for (size_t k = 0; k < coverage_format2.range_count; ++k) {
|
|
|
- auto range_record = coverage_format2.range_records[k];
|
|
|
- if ((range_record.start_glyph_id <= glyph_id) && (glyph_id <= range_record.end_glyph_id))
|
|
|
- return range_record.start_coverage_index + glyph_id - range_record.start_glyph_id;
|
|
|
- }
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Glyph ID {} not covered", glyph_id);
|
|
|
- return {};
|
|
|
- }
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "No valid coverage table for format {}", coverage_format);
|
|
|
- return {};
|
|
|
- };
|
|
|
-
|
|
|
- auto coverage_index = get_coverage_index(left_glyph_id, pair_pos_format1.coverage_offset);
|
|
|
-
|
|
|
- if (!coverage_index.has_value()) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Glyph ID not covered by table");
|
|
|
- continue;
|
|
|
- }
|
|
|
-
|
|
|
- size_t value1_size = popcount(static_cast<u32>(pair_pos_format1.value_format1 & 0xff)) * sizeof(u16);
|
|
|
- size_t value2_size = popcount(static_cast<u32>(pair_pos_format1.value_format2 & 0xff)) * sizeof(u16);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "ValueSizes: {}, {}", value1_size, value2_size);
|
|
|
-
|
|
|
- // Manually iterate over the PairSet table, as the size of each PairValueRecord is not known at compile time.
|
|
|
- auto pair_set_offset = pair_pos_format1.pair_set_offsets[coverage_index.value()];
|
|
|
- auto pair_set_slice = pair_pos_format_slice.slice(pair_set_offset);
|
|
|
-
|
|
|
- FixedMemoryStream stream(pair_set_slice);
|
|
|
-
|
|
|
- auto pair_value_count = stream.read_value<BigEndian<u16>>().release_value_but_fixme_should_propagate_errors();
|
|
|
-
|
|
|
- bool found_matching_glyph = false;
|
|
|
- for (size_t k = 0; k < pair_value_count; ++k) {
|
|
|
- auto second_glyph = stream.read_value<BigEndian<u16>>().release_value_but_fixme_should_propagate_errors();
|
|
|
-
|
|
|
- if (right_glyph_id == second_glyph) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Found matching second glyph {}", second_glyph);
|
|
|
- found_matching_glyph = true;
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- (void)stream.discard(value1_size + value2_size).release_value_but_fixme_should_propagate_errors();
|
|
|
- }
|
|
|
-
|
|
|
- if (!found_matching_glyph) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Did not find second glyph matching {}", right_glyph_id);
|
|
|
- continue;
|
|
|
- }
|
|
|
-
|
|
|
- [[maybe_unused]] auto value_record1 = read_value_record(pair_pos_format1.value_format1, stream);
|
|
|
- [[maybe_unused]] auto value_record2 = read_value_record(pair_pos_format1.value_format2, stream);
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Returning x advance {}", value_record1.x_advance);
|
|
|
- return value_record1.x_advance;
|
|
|
- }
|
|
|
-
|
|
|
- else if (pair_pos_format == 2) {
|
|
|
- auto const& pair_pos_format2 = *bit_cast<GPOS::PairPosFormat2 const*>(pair_pos_format_slice.data());
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " posFormat: {}", pair_pos_format2.pos_format);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " valueFormat1: {}", pair_pos_format2.value_format1);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " valueFormat2: {}", pair_pos_format2.value_format2);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " class1Count: {}", pair_pos_format2.class1_count);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " class2Count: {}", pair_pos_format2.class2_count);
|
|
|
-
|
|
|
- auto get_class = [&](u16 glyph_id, Offset16 glyph_def_offset) -> Optional<u16> {
|
|
|
- auto class_def_format_slice = pair_pos_format_slice.slice(glyph_def_offset);
|
|
|
-
|
|
|
- auto const& class_def_format = *bit_cast<BigEndian<u16> const*>(class_def_format_slice.data());
|
|
|
- if (class_def_format == 1) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "FIXME: Implement ClassDefFormat1");
|
|
|
- return {};
|
|
|
- }
|
|
|
-
|
|
|
- auto const& class_def_format2 = *bit_cast<ClassDefFormat2 const*>(class_def_format_slice.data());
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "ClassDefFormat2:");
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " classFormat: {}", class_def_format2.class_format);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, " classRangeCount: {}", class_def_format2.class_range_count);
|
|
|
-
|
|
|
- for (size_t i = 0; i < class_def_format2.class_range_count; ++i) {
|
|
|
- auto const& range = class_def_format2.class_range_records[i];
|
|
|
- if (glyph_id >= range.start_glyph_id && glyph_id <= range.end_glyph_id) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Found class {} for glyph ID {}", range.class_, glyph_id);
|
|
|
- return range.class_;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "No class found for glyph {}", glyph_id);
|
|
|
- return {};
|
|
|
- };
|
|
|
-
|
|
|
- auto left_class = get_class(left_glyph_id, pair_pos_format2.class_def1_offset);
|
|
|
- auto right_class = get_class(right_glyph_id, pair_pos_format2.class_def2_offset);
|
|
|
-
|
|
|
- if (!left_class.has_value() || !right_class.has_value()) {
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Need glyph class for both sides");
|
|
|
- continue;
|
|
|
- }
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Classes: {}, {}", left_class.value(), right_class.value());
|
|
|
-
|
|
|
- size_t value1_size = popcount(static_cast<u32>(pair_pos_format2.value_format1 & 0xff)) * sizeof(u16);
|
|
|
- size_t value2_size = popcount(static_cast<u32>(pair_pos_format2.value_format2 & 0xff)) * sizeof(u16);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "ValueSizes: {}, {}", value1_size, value2_size);
|
|
|
- size_t class2_record_size = value1_size + value2_size;
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Class2RecordSize: {}", class2_record_size);
|
|
|
- size_t class1_record_size = pair_pos_format2.class2_count * class2_record_size;
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Class1RecordSize: {}", class1_record_size);
|
|
|
- size_t item_offset = (left_class.value() * class1_record_size) + (right_class.value() * class2_record_size);
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Item offset: {}", item_offset);
|
|
|
-
|
|
|
- auto item_slice = pair_pos_format_slice.slice(sizeof(PairPosFormat2) + item_offset);
|
|
|
- FixedMemoryStream stream(item_slice);
|
|
|
-
|
|
|
- [[maybe_unused]] auto value_record1 = read_value_record(pair_pos_format2.value_format1, stream);
|
|
|
- [[maybe_unused]] auto value_record2 = read_value_record(pair_pos_format2.value_format2, stream);
|
|
|
-
|
|
|
- dbgln_if(OPENTYPE_GPOS_DEBUG, "Returning x advance {}", value_record1.x_advance);
|
|
|
- return value_record1.x_advance;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- (void)left_glyph_id;
|
|
|
- (void)right_glyph_id;
|
|
|
- return {};
|
|
|
-}
|
|
|
-
|
|
|
}
|
Sam Atkins