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LibGfx: Implement TrimmedTable mappings for Cmaps

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This commit is contained in:
Julian Offenhäuser 2023-01-09 16:06:21 +01:00 • committed by Linus Groh
parent 04ee181b21
commit 5b7dfe848d
2 changed files with 22 additions and 0 deletions
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16
Userland/Libraries/LibGfx/Font/OpenType/Cmap.cpp
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@ -83,6 +83,8 @@ u32 Cmap::Subtable::glyph_id_for_code_point(u32 code_point) const
return glyph_id_for_code_point_table_0(code_point); return glyph_id_for_code_point_table_0(code_point);
case Format::SegmentToDelta: case Format::SegmentToDelta:
return glyph_id_for_code_point_table_4(code_point); return glyph_id_for_code_point_table_4(code_point);
case Format::TrimmedTable:
return glyph_id_for_code_point_table_6(code_point);
case Format::SegmentedCoverage: case Format::SegmentedCoverage:
return glyph_id_for_code_point_table_12(code_point); return glyph_id_for_code_point_table_12(code_point);
default: default:
@ -129,6 +131,20 @@ u32 Cmap::Subtable::glyph_id_for_code_point_table_4(u32 code_point) const
return (be_u16(m_slice.offset_pointer(glyph_offset)) + delta) & 0xffff; return (be_u16(m_slice.offset_pointer(glyph_offset)) + delta) & 0xffff;
} }
u32 Cmap::Subtable::glyph_id_for_code_point_table_6(u32 code_point) const
{
u32 first_code = be_u16(m_slice.offset_pointer((u32)Table6Offsets::FirstCode));
if (code_point < first_code)
return 0;
u32 entry_count = be_u16(m_slice.offset_pointer((u32)Table6Offsets::EntryCount));
u32 code_offset = code_point - first_code;
if (code_offset > entry_count)
return 0;
return be_u16(m_slice.offset_pointer((u32)Table6Offsets::GlyphIdArray + code_offset * 2));
}
u32 Cmap::Subtable::glyph_id_for_code_point_table_12(u32 code_point) const u32 Cmap::Subtable::glyph_id_for_code_point_table_12(u32 code_point) const
{ {
u32 num_groups = be_u32(m_slice.offset_pointer((u32)Table12Offsets::NumGroups)); u32 num_groups = be_u32(m_slice.offset_pointer((u32)Table12Offsets::NumGroups));

6
Userland/Libraries/LibGfx/Font/OpenType/Cmap.h
View file

@ -67,6 +67,11 @@ public:
Constant = 16, Constant = 16,
NonConstMultiplier = 4, NonConstMultiplier = 4,
}; };
enum class Table6Offsets {
FirstCode = 6,
EntryCount = 8,
GlyphIdArray = 10
};
enum class Table12Offsets { enum class Table12Offsets {
NumGroups = 12, NumGroups = 12,
Record_StartCode = 16, Record_StartCode = 16,
@ -80,6 +85,7 @@ public:
u32 glyph_id_for_code_point_table_0(u32 code_point) const; 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_4(u32 code_point) const;
u32 glyph_id_for_code_point_table_6(u32 code_point) const;
u32 glyph_id_for_code_point_table_12(u32 code_point) const; u32 glyph_id_for_code_point_table_12(u32 code_point) const;
ReadonlyBytes m_slice; ReadonlyBytes m_slice;