Struct CosmicTextSystem 

pub struct CosmicTextSystem(/* private fields */);

基于 cosmic-text 的文本系统实现

Implementations

impl CosmicTextSystem

pub fn new(system_font_fallback: &str) -> Self

创建新的文本系统，加载系统字体

pub fn new_without_system_fonts(system_font_fallback: &str) -> Self

创建不加载系统字体的文本系统

Trait Implementations

impl PlatformTextSystem for CosmicTextSystem

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

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

获取所有可用字体名称

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

获取字体描述符对应的字体 ID

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

获取字体度量信息

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

获取字形的排版边界

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

获取字形的前进宽度

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

获取字符对应的字形 ID

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

获取字形的栅格边界

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

栅格化字形

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

使用给定的字体运行信息布局一行文本

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

返回给定字体和大小的推荐文本渲染模式

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

返回使用给定颜色绘制字形时应使用的膨胀级别