Struct TestTextSystem 

pub struct TestTextSystem;

Implementations

impl TestTextSystem

pub fn new() -> Self

Trait Implementations

impl PlatformTextSystem for TestTextSystem

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

Adds fonts from their file bytes, such as TTF or OTF data, so layout can find them by family name.

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

Returns the names of every font family available to layout.

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

Returns the id of the font that best matches descriptor.

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

Returns the metrics, such as ascent, descent and line gap, for font_id.

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

Returns the glyph’s bounding box, relative to its origin on the baseline.

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

Returns the distance the pen moves after drawing this glyph.

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

Returns the glyph that font_id uses for ch, or None if the font has no glyph for it.

fn rasterize_glyph( &self, _params: &RenderGlyphParams, ) -> Result<RasterizedGlyph>

Rasterizes a glyph, including its atlas placement and pixels.

fn layout_text(&self, request: TextLayoutRequest<'_>) -> LineLayout

Lays out one complete text document, including hard breaks and optional wrapping.

fn layout_inline(&self, request: InlineLayoutRequest<'_>) -> InlineLayout

Lays out one complete text document that contains atomic element boxes, which keep their size and sit on the text line.

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

Returns the text rendering mode the platform recommends for font_id at font_size.

fn font_generation(&self) -> u64

Returns a number that changes whenever the font collection changes, so caches can detect stale entries.

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

Loads the caches that shaping needs for font_ids, so the first layout with them is fast. The default does nothing.

fn prepare_raster_style( &self, request: RasterStyleRequest, ) -> PreparedRasterStyle

Returns the raster style to use for request, normalized so that cached glyph pixels can be shared. The default uses the requested mode unchanged.