zng::font

Struct Font

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pub struct Font(/* private fields */);
Expand description

A sized font face.

A sized font can be requested from a FontFace.

This type is a shared reference to the loaded font data, cloning it is cheap.

Implementations§

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impl Font

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pub fn space_index(&self) -> u32

Glyph index for the space ' ' character.

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pub fn space_x_advance(&self) -> Px

Returns the horizontal advance of the space ' ' character.

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pub fn shape_text( &self, text: &SegmentedText, config: &TextShapingArgs, ) -> ShapedText

Calculates a ShapedText.

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pub fn outline( &self, glyph_id: u32, sink: &mut impl OutlineSink, ) -> Option<Rect<Px, Px>>

Sends the sized vector path for a glyph to sink.

Returns the glyph bounds if a full outline was sent to the sink.

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pub fn h_line_hits( &self, glyph_id: u32, line_y_range: (f32, f32), ) -> Option<(f32, f32)>

Ray cast an horizontal line across the glyph and returns the entry and exit hits.

The line_y_range are two vertical offsets relative to the baseline, the offsets define the start and inclusive end of the horizontal line, that is, (underline, underline + thickness), note that positions under the baseline are negative so a 2px underline set 1px under the baseline becomes (-1.0, -3.0).

Returns Ok(Some(x_enter, x_exit)) where the two values are x-advances, returns None if there is no hit. The first x-advance is from the left typographic border to the first hit on the outline, the second x-advance is from the first across the outline to the exit hit.

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impl Font

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pub fn face(&self) -> &FontFace

Reference the font face source of this font.

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pub fn harfbuzz(&self) -> Option<hb_font_t<'_>>

Gets the sized harfbuzz font.

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pub fn size(&self) -> Px

Font size.

This is also the pixels-per-em value.

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pub fn variations(&self) -> &Vec<Variation>

Custom font variations.

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pub fn metrics(&self) -> &FontMetrics

Sized font metrics.

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pub fn ligature_caret_offsets( &self, lig: u32, ) -> impl ExactSizeIterator + DoubleEndedIterator

Iterate over pixel offsets relative to lig glyph start that represents the caret offset for each cluster that is covered by the ligature, after the first.

The caret offset for the first cluster is the glyph offset and is not yielded in the iterator. The yielded offsets are relative to the glyph position.

Trait Implementations§

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impl Clone for Font

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fn clone(&self) -> Font

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Font

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Font for Font

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fn is_empty_fallback(&self) -> bool

Gets if the font is the fallback that does not have any glyph.
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fn renderer_id( &self, renderer: &ViewRenderer, synthesis: FontSynthesis, ) -> FontId

Gets the instance key in the renderer namespace. Read more
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impl PartialEq for Font

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fn eq(&self, other: &Font) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for Font

Auto Trait Implementations§

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impl Freeze for Font

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impl !RefUnwindSafe for Font

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impl Send for Font

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impl Sync for Font

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impl Unpin for Font

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impl !UnwindSafe for Font

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> AnyEq for T
where T: Any + PartialEq,

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fn equals(&self, other: &(dyn Any + 'static)) -> bool

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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Access to mut dyn Any methods.
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fn clone_boxed(&self) -> Box<dyn AnyVarValue>

Clone the value.
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fn clone_boxed_var(&self) -> Box<dyn AnyVar>

Clone the value into a new boxed LocalVar<Self>.
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Access to Box<dyn Any> methods.
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Gets if self equals other.
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Immutably borrows from an owned value. Read more
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fn borrow_mut(&mut self) -> &mut T

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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