Struct fonts::font_context::FontContext

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pub struct FontContext {
    system_font_service_proxy: Arc<SystemFontServiceProxy>,
    resource_threads: Mutex<CoreResourceThread>,
    compositor_api: Mutex<CrossProcessCompositorApi>,
    fonts: RwLock<HashMap<FontCacheKey, Option<FontRef>>>,
    resolved_font_groups: RwLock<HashMap<FontGroupCacheKey, Arc<RwLock<FontGroup>>, BuildHasherDefault<FnvHasher>>>,
    web_fonts: Arc<RwLock<FontStore>>,
    webrender_font_keys: RwLock<HashMap<FontIdentifier, FontKey>>,
    webrender_font_instance_keys: RwLock<HashMap<(FontKey, Au), FontInstanceKey>>,
    font_data: RwLock<HashMap<FontIdentifier, FontData>>,
    have_removed_web_fonts: AtomicBool,
}
Expand description

The FontContext represents the per-thread/thread state necessary for working with fonts. It is the public API used by the layout and paint code. It talks directly to the system font service where required.

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§system_font_service_proxy: Arc<SystemFontServiceProxy>§resource_threads: Mutex<CoreResourceThread>§compositor_api: Mutex<CrossProcessCompositorApi>

A sender that can send messages and receive replies from the compositor.

§fonts: RwLock<HashMap<FontCacheKey, Option<FontRef>>>

The actual instances of fonts ie a FontTemplate combined with a size and other font properties, along with the font data and a platform font instance.

§resolved_font_groups: RwLock<HashMap<FontGroupCacheKey, Arc<RwLock<FontGroup>>, BuildHasherDefault<FnvHasher>>>

A caching map between the specification of a font in CSS style and resolved FontGroup which contains information about all fonts that can be selected with that style.

§web_fonts: Arc<RwLock<FontStore>>§webrender_font_keys: RwLock<HashMap<FontIdentifier, FontKey>>

A collection of WebRender FontKeys generated for the web fonts that this FontContext controls.

§webrender_font_instance_keys: RwLock<HashMap<(FontKey, Au), FontInstanceKey>>

A collection of WebRender FontInstanceKeys generated for the web fonts that this FontContext controls.

§font_data: RwLock<HashMap<FontIdentifier, FontData>>

The data for each web font FontIdentifier. This data might be used by more than one FontTemplate as each identifier refers to a URL.

§have_removed_web_fonts: AtomicBool

Implementations§

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impl FontContext

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pub fn new( system_font_service_proxy: Arc<SystemFontServiceProxy>, compositor_api: CrossProcessCompositorApi, resource_threads: ResourceThreads, ) -> Self

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pub fn web_fonts_still_loading(&self) -> usize

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fn get_font_data(&self, identifier: &FontIdentifier) -> Option<FontData>

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fn handle_web_font_load_finished( &self, finished_callback: &WebFontLoadFinishedCallback, succeeded: bool, )

Handle the situation where a web font finishes loading, specifying if the load suceeded or failed.

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pub fn font_group( &self, style: ServoArc<FontStyleStruct>, ) -> Arc<RwLock<FontGroup>>

Returns a FontGroup representing fonts which can be used for layout, given the style. Font groups are cached, so subsequent calls with the same style will return a reference to an existing FontGroup.

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pub fn font_group_with_size( &self, style: ServoArc<FontStyleStruct>, size: Au, ) -> Arc<RwLock<FontGroup>>

Like Self::font_group, but overriding the size found in the FontStyleStruct with the given size in pixels.

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pub fn font( &self, font_template: FontTemplateRef, font_descriptor: &FontDescriptor, ) -> Option<FontRef>

Returns a font matching the parameters. Fonts are cached, so repeated calls will return a reference to the same underlying Font.

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fn get_font_maybe_synthesizing_small_caps( &self, font_template: FontTemplateRef, font_descriptor: &FontDescriptor, synthesize_small_caps: bool, ) -> Option<FontRef>

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fn matching_web_font_templates( &self, descriptor_to_match: &FontDescriptor, family_descriptor: &FontFamilyDescriptor, ) -> Option<Vec<FontTemplateRef>>

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pub fn matching_templates( &self, descriptor_to_match: &FontDescriptor, family_descriptor: &FontFamilyDescriptor, ) -> Vec<FontTemplateRef>

Try to find matching templates in this FontContext, first looking in the list of web fonts and falling back to asking the super::SystemFontService for a matching system font.

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fn create_font( &self, font_template: FontTemplateRef, font_descriptor: FontDescriptor, synthesized_small_caps: Option<FontRef>, ) -> Result<FontRef, &'static str>

Create a Font for use in layout calculations, from a FontTemplateData returned by the cache thread and a FontDescriptor which contains the styling parameters.

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pub(crate) fn create_font_instance_key(&self, font: &Font) -> FontInstanceKey

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fn create_web_font_instance( &self, font_template: FontTemplateRef, pt_size: Au, flags: FontInstanceFlags, ) -> FontInstanceKey

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fn invalidate_font_groups_after_web_font_load(&self)

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impl FontContext

Trait Implementations§

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impl MallocSizeOf for FontContext

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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

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