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PlatformTextSystem

gpui_core

Trait PlatformTextSystem 

Source 
pub trait PlatformTextSystem: Send + Sync {

Show 14 methods    // Required methods
    fn add_fonts(&self, fonts: Vec<Cow<'static, [u8]>>) -> Result<()>;
    fn all_font_names(&self) -> Vec<String>;
    fn font_id(&self, descriptor: &Font) -> Result<FontId>;
    fn font_metrics(&self, font_id: FontId) -> FontMetrics;
    fn typographic_bounds(
        &self,
        font_id: FontId,
        glyph_id: GlyphId,
    ) -> Result<Bounds<f32>>;
    fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Size<f32>>;
    fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option<GlyphId>;
    fn glyph_raster_bounds(
        &self,
        params: &RenderGlyphParams,
    ) -> Result<Bounds<DevicePixels>>;
    fn rasterize_glyph(
        &self,
        params: &RenderGlyphParams,
        raster_bounds: Bounds<DevicePixels>,
    ) -> Result<(Size<DevicePixels>, Vec<u8>)>;
    fn layout_line(
        &self,
        text: &str,
        font_size: Pixels,
        runs: &[FontRun],
    ) -> LineLayout;

    // Provided methods
    fn clear_glyph_raster_cache(&self) { ... }
    fn prewarm_fonts(&self, _font_ids: &[FontId]) { ... }
    fn set_missing_glyph_sink(&self, _sink: Arc<dyn MissingGlyphSink>) { ... }
    fn glyph_dilation_for_color(&self, _color: Hsla) -> u8 { ... }

}

Required Methods§

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fn add_fonts(&self, fonts: Vec<Cow<'static, [u8]>>) -> Result<()>

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fn all_font_names(&self) -> Vec<String>

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fn font_id(&self, descriptor: &Font) -> Result<FontId>

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fn font_metrics(&self, font_id: FontId) -> FontMetrics

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fn typographic_bounds( &self, font_id: FontId, glyph_id: GlyphId, ) -> Result<Bounds<f32>>

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fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Size<f32>>

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fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option<GlyphId>

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fn glyph_raster_bounds( &self, params: &RenderGlyphParams, ) -> Result<Bounds<DevicePixels>>

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fn rasterize_glyph( &self, params: &RenderGlyphParams, raster_bounds: Bounds<DevicePixels>, ) -> Result<(Size<DevicePixels>, Vec<u8>)>

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fn layout_line( &self, text: &str, font_size: Pixels, runs: &[FontRun], ) -> LineLayout

Provided Methods§

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fn clear_glyph_raster_cache(&self)

Drop platform-side glyph rasterization data associated with the core raster-bounds cache.

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fn prewarm_fonts(&self, _font_ids: &[FontId])

Prewarm any system font caches needed to shape text.

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fn set_missing_glyph_sink(&self, _sink: Arc<dyn MissingGlyphSink>)

Installs the sink for grapheme clusters that exhaust font fallback during Self::layout_line. The core text system installs its reporter when it is created. Platforms that do not detect missing glyphs keep the default no-op.

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fn glyph_dilation_for_color(&self, _color: Hsla) -> u8

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§