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LibGfx: Parse the TTF fpgm and prep tables

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These contain the font and CVT programs respectively.
This commit is contained in:
MacDue 2023-01-10 20:57:24 +00:00 committed by Andreas Kling
parent 3b282ba8bb
commit 4e5dc169a6
3 changed files with 52 additions and 2 deletions
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18
Userland/Libraries/LibGfx/Font/OpenType/Font.cpp
View file

@ -396,6 +396,8 @@ ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_offset(ReadonlyBytes buffer, u3
Optional<ReadonlyBytes> opt_glyf_slice = {};
Optional<ReadonlyBytes> opt_os2_slice = {};
Optional<ReadonlyBytes> opt_kern_slice = {};
Optional<ReadonlyBytes> opt_fpgm_slice = {};
Optional<ReadonlyBytes> opt_prep_slice = {};
Optional<Head> opt_head = {};
Optional<Name> opt_name = {};
@ -406,6 +408,8 @@ ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_offset(ReadonlyBytes buffer, u3
Optional<Loca> opt_loca = {};
Optional<OS2> opt_os2 = {};
Optional<Kern> opt_kern = {};
Optional<Fpgm> opt_fpgm = {};
Optional<Prep> opt_prep = {};
auto num_tables = be_u16(buffer.offset_pointer(offset + (u32)Offsets::NumTables));
if (buffer.size() < offset + (u32)Sizes::OffsetTable + num_tables * (u32)Sizes::TableRecord)
@ -446,6 +450,10 @@ ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_offset(ReadonlyBytes buffer, u3
opt_os2_slice = buffer_here;
} else if (tag == tag_from_str("kern")) {
opt_kern_slice = buffer_here;
} else if (tag == tag_from_str("fpgm")) {
opt_fpgm_slice = buffer_here;
} else if (tag == tag_from_str("prep")) {
opt_prep_slice = buffer_here;
}
}
@ -489,6 +497,14 @@ ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_offset(ReadonlyBytes buffer, u3
if (opt_kern_slice.has_value())
kern = TRY(Kern::from_slice(opt_kern_slice.value()));
Optional<Fpgm> fpgm;
if (opt_fpgm_slice.has_value())
fpgm = Fpgm(opt_fpgm_slice.value());
Optional<Prep> prep;
if (opt_prep_slice.has_value())
prep = Prep(opt_prep_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++) {
@ -516,7 +532,7 @@ ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_offset(ReadonlyBytes buffer, u3
}
}
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), move(kern)));
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), move(kern), move(fpgm), move(prep)));
}
Gfx::ScaledFontMetrics Font::metrics([[maybe_unused]] float x_scale, float y_scale) const

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

@ -52,7 +52,7 @@ private:
static ErrorOr<NonnullRefPtr<Font>> try_load_from_offset(ReadonlyBytes, unsigned index = 0);
Font(ReadonlyBytes bytes, Head&& head, Name&& name, Hhea&& hhea, Maxp&& maxp, Hmtx&& hmtx, Cmap&& cmap, Loca&& loca, Glyf&& glyf, Optional<OS2> os2, Optional<Kern>&& kern)
Font(ReadonlyBytes bytes, Head&& head, Name&& name, Hhea&& hhea, Maxp&& maxp, Hmtx&& hmtx, Cmap&& cmap, Loca&& loca, Glyf&& glyf, Optional<OS2> os2, Optional<Kern>&& kern, Optional<Fpgm> fpgm, Optional<Prep> prep)
: m_buffer(move(bytes))
, m_head(move(head))
, m_name(move(name))
@ -64,6 +64,8 @@ private:
, m_cmap(move(cmap))
, m_os2(move(os2))
, m_kern(move(kern))
, m_fpgm(move(fpgm))
, m_prep(move(prep))
{
}
@ -82,6 +84,8 @@ private:
Cmap m_cmap;
Optional<OS2> m_os2;
Optional<Kern> m_kern;
Optional<Fpgm> m_fpgm;
Optional<Prep> m_prep;
};
}

30
Userland/Libraries/LibGfx/Font/OpenType/Tables.h
View file

@ -171,6 +171,36 @@ struct GlyphHorizontalMetrics {
i16 left_side_bearing;
};
// https://learn.microsoft.com/en-us/typography/opentype/spec/fpgm
// fpgm: Font Program
struct Fpgm {
public:
explicit Fpgm(ReadonlyBytes slice)
: m_slice(slice)
{
}
ReadonlyBytes program_data() const { return m_slice; }
private:
ReadonlyBytes m_slice;
};
// https://learn.microsoft.com/en-us/typography/opentype/spec/prep
// prep: Control Value Program
struct Prep {
public:
explicit Prep(ReadonlyBytes slice)
: m_slice(slice)
{
}
ReadonlyBytes program_data() const { return m_slice; }
private:
ReadonlyBytes m_slice;
};
// https://learn.microsoft.com/en-us/typography/opentype/spec/hmtx
// hmtx: Horizontal Metrics Table
class Hmtx {