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LibGfx/OpenType: Support cmaps with format Unicode

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Some fonts only contain unicode tables. This makes them work.
This commit is contained in:
Nico Weber 2024-02-06 21:41:22 -05:00 committed by Sam Atkins
parent 54ab6fe5b9
commit 21ffb118af
2 changed files with 22 additions and 1 deletions
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10
Userland/Libraries/LibGfx/Font/OpenType/Cmap.h
View file

@ -34,6 +34,16 @@ public:
ManyToOneRange = 13,
UnicodeVariationSequences = 14,
};
enum class UnicodeEncoding {
DeprecatedUnicode1_0 = 0,
DeprecatedUnicode1_1 = 1,
DeprecatedISO10646 = 2,
Unicode2_0_BMP_Only = 3,
Unicode2_0_FullRepertoire = 4,
UnicodeVariationSequences = 5, // "for use with subtable format 14"
UnicodeFullRepertoire = 6, // "for use with subtable format 13"
};
enum class WindowsEncoding {
UnicodeBMP = 1,
UnicodeFullRepertoire = 10,

13
Userland/Libraries/LibGfx/Font/OpenType/Font.cpp
View file

@ -236,7 +236,18 @@ ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_offset(ReadonlyBytes buffer, u3
/* NOTE: The encoding records are sorted first by platform ID, then by encoding ID.
This means that the Windows platform will take precedence over Macintosh, which is
usually what we want here. */
if (platform.value() == Cmap::Subtable::Platform::Windows) {
if (platform.value() == Cmap::Subtable::Platform::Unicode) {
if (subtable.encoding_id() == (u16)Cmap::Subtable::UnicodeEncoding::Unicode2_0_FullRepertoire) {
// "Encoding ID 3 should be used in conjunction with 'cmap' subtable formats 4 or 6."
cmap.set_active_index(i);
break;
}
if (subtable.encoding_id() == (u16)Cmap::Subtable::UnicodeEncoding::Unicode2_0_BMP_Only) {
// "Encoding ID 4 should be used in conjunction with subtable formats 10 or 12."
cmap.set_active_index(i);
break;
}
} else if (platform.value() == Cmap::Subtable::Platform::Windows) {
if (subtable.encoding_id() == (u16)Cmap::Subtable::WindowsEncoding::UnicodeFullRepertoire) {
cmap.set_active_index(i);
break;