Struct fonts::FontContext

pub struct FontContext<S: FontSource> {
    font_source: ReentrantMutex<S>,
    resource_threads: ReentrantMutex<CoreResourceThread>,
    cache: CachingFontSource<S>,
    web_fonts: Arc<RwLock<FontStore>>,
    webrender_font_store: Arc<RwLock<WebRenderFontStore>>,
    have_removed_web_fonts: AtomicBool,
}

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 font cache thread where required.

Fields

font_source: ReentrantMutex<S>

resource_threads: ReentrantMutex<CoreResourceThread>

cache: CachingFontSource<S>

web_fonts: Arc<RwLock<FontStore>>

webrender_font_store: Arc<RwLock<WebRenderFontStore>>

have_removed_web_fonts: AtomicBool

Implementations

impl<S: FontSource> FontContext<S>

pub fn new(font_source: S, resource_threads: ResourceThreads) -> FontContext<S>

pub fn web_fonts_still_loading(&self) -> usize

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.

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.

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.

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.

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

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

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::FontCacheThread for a matching system font.

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.

Trait Implementations

impl<S: FontSource> MallocSizeOf for FontContext<S>

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.