[−][src]Struct ttf_parser::cmap::Subtable
A character encoding subtable.
Implementations
impl<'a> Subtable<'a>
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pub fn platform_id(&self) -> PlatformId
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Returns encoding's platform.
pub fn encoding_id(&self) -> u16
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Returns encoding ID.
pub fn format(&self) -> Format
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Returns encoding's format.
pub fn is_unicode(&self) -> bool
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Checks that the current encoding is Unicode compatible.
pub fn glyph_index(&self, c: u32) -> Option<GlyphId>
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Maps a character to a glyph ID.
This is a low-level method and unlike Face::glyph_index
it doesn't
check that the current encoding is Unicode.
It simply maps a u32
codepoint number to a glyph ID.
Returns None
:
- when glyph ID is
0
. - when format is
MixedCoverage
, since it's not supported. - when format is
UnicodeVariationSequences
. Useglyph_variation_index
instead.
pub fn glyph_variation_index(
&self,
c: char,
variation: char
) -> Option<GlyphVariationResult>
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&self,
c: char,
variation: char
) -> Option<GlyphVariationResult>
Resolves a variation of a glyph ID from two code points.
Returns None
:
- when glyph ID is
0
. - when format is not
UnicodeVariationSequences
.
pub fn codepoints<F: FnMut(u32)>(&self, f: F)
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Calls f
for all codepoints contained in this subtable.
This is a low-level method and it doesn't check that the current
encoding is Unicode. It simply calls the function f
for all u32
codepoints that are present in this subtable.
Note that this may list codepoints for which glyph_index
still returns
None
because this method finds all codepoints which were defined in
this subtable. The subtable may still map them to glyph ID 0
.
Returns without doing anything:
- when format is
MixedCoverage
, since it's not supported. - when format is
UnicodeVariationSequences
, since it's not supported.
Trait Implementations
Auto Trait Implementations
impl<'a> RefUnwindSafe for Subtable<'a>
impl<'a> Send for Subtable<'a>
impl<'a> Sync for Subtable<'a>
impl<'a> Unpin for Subtable<'a>
impl<'a> UnwindSafe for Subtable<'a>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,