Struct fonts::system_font_service::SystemFontService

pub struct SystemFontService {
    port: IpcReceiver<SystemFontServiceMessage>,
    local_families: FontStore,
    compositor_api: CrossProcessCompositorApi,
    webrender_fonts: HashMap<FontIdentifier, FontKey>,
    font_instances: HashMap<(FontKey, Au), FontInstanceKey>,
    generic_fonts: ResolvedGenericFontFamilies,
    free_font_keys: Vec<FontKey>,
    free_font_instance_keys: Vec<FontInstanceKey>,
}

The system font service. There is one of these for every Servo instance. This is a thread, responsible for reading the list of system fonts, handling requests to match against them, and ensuring that only one copy of system font data is loaded at a time.

Fields

port: IpcReceiver<SystemFontServiceMessage>

local_families: FontStore

compositor_api: CrossProcessCompositorApi

webrender_fonts: HashMap<FontIdentifier, FontKey>

font_instances: HashMap<(FontKey, Au), FontInstanceKey>

generic_fonts: ResolvedGenericFontFamilies

free_font_keys: Vec<FontKey>

This is an optimization that allows the SystemFontService to send font data to the compositor asynchronously for creating WebRender fonts, while immediately returning a font key for that data. Once the free keys are exhausted, the SystemFontService will fetch a new batch.

free_font_instance_keys: Vec<FontInstanceKey>

This is an optimization that allows the SystemFontService to create WebRender font instances in the compositor asynchronously, while immediately returning a font instance key for the instance. Once the free keys are exhausted, the SystemFontService will fetch a new batch.

Implementations

impl SystemFontService

pub fn spawn( compositor_api: CrossProcessCompositorApi, ) -> SystemFontServiceProxySender

fn run(&mut self)

fn fetch_new_keys(&mut self)

fn get_font_templates( &mut self, font_descriptor: Option<FontDescriptor>, font_family: SingleFontFamily, ) -> Vec<FontTemplate>

fn refresh_local_families(&mut self)

fn find_font_templates( &mut self, descriptor_to_match: Option<&FontDescriptor>, family: &SingleFontFamily, ) -> Vec<FontTemplateRef>

fn get_font_instance( &mut self, identifier: FontIdentifier, pt_size: Au, flags: FontInstanceFlags, ) -> FontInstanceKey

pub(crate) fn family_name_for_single_font_family( &mut self, family: &SingleFontFamily, ) -> LowercaseFontFamilyName