Trait PlatformTextSystem 

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

    // Provided methods
    fn prewarm_fonts(&self, _font_ids: &[FontId]) { ... }
    fn glyph_dilation_for_color(&self, _color: Hsla) -> u8 { ... }
}

Required Methods

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

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

Get all available font names.

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

Get the font ID for a font descriptor.

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

Get metrics for a font.

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

Get typographic bounds for a glyph.

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

Get the advance width for a glyph.

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

Get the glyph ID for a character.

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

Get raster bounds for a glyph.

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

Rasterize a glyph.

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

Layout a line of text with the given font runs.

fn recommended_rendering_mode( &self, _font_id: FontId, _font_size: Pixels, ) -> TextRenderingMode

Returns the recommended text rendering mode for the given font and size.

Provided Methods

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

Prewarm any system font caches needed to shape text.

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

Returns the dilation level to use for a glyph painted in the given color.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl PlatformTextSystem for CosmicTextSystem

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

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

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

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

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

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

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

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

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

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

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

fn recommended_rendering_mode( &self, _font_id: FontId, _font_size: Pixels, ) -> TextRenderingMode

Implementors

impl PlatformTextSystem for NoopTextSystem