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LibGfx: Implement ByteEncoding mappings for Cmaps

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This commit is contained in:
Julian Offenhäuser 2022-11-27 00:20:45 +01:00 • committed by Linus Groh
parent 0ff9f2b865
commit 04ee181b21
2 changed files with 15 additions and 1 deletions
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12
Userland/Libraries/LibGfx/Font/OpenType/Cmap.cpp
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@ -75,10 +75,12 @@ Optional<Cmap::Subtable> Cmap::subtable(u32 index) const
return Subtable(subtable_slice, platform_id, encoding_id);
}
// FIXME: This only handles formats 4 (SegmentToDelta) and 12 (SegmentedCoverage) for now.
// FIXME: Implement the missing formats.
u32 Cmap::Subtable::glyph_id_for_code_point(u32 code_point) const
{
switch (format()) {
case Format::ByteEncoding:
return glyph_id_for_code_point_table_0(code_point);
case Format::SegmentToDelta:
return glyph_id_for_code_point_table_4(code_point);
case Format::SegmentedCoverage:
@ -88,6 +90,14 @@ u32 Cmap::Subtable::glyph_id_for_code_point(u32 code_point) const
}
}
u32 Cmap::Subtable::glyph_id_for_code_point_table_0(u32 code_point) const
{
if (code_point > 255)
return 0;
return m_slice.at((u32)Table0Offsets::GlyphIdArray + code_point);
}
u32 Cmap::Subtable::glyph_id_for_code_point_table_4(u32 code_point) const
{
u32 segcount_x2 = be_u16(m_slice.offset_pointer((u32)Table4Offsets::SegCountX2));

4
Userland/Libraries/LibGfx/Font/OpenType/Cmap.h
View file

@ -52,6 +52,9 @@ public:
Format format() const;
private:
enum class Table0Offsets {
GlyphIdArray = 6
};
enum class Table4Offsets {
SegCountX2 = 6,
EndConstBase = 14,
@ -75,6 +78,7 @@ public:
Record = 12,
};
u32 glyph_id_for_code_point_table_0(u32 code_point) const;
u32 glyph_id_for_code_point_table_4(u32 code_point) const;
u32 glyph_id_for_code_point_table_12(u32 code_point) const;