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Fix selection of fallback fonts. Fixes monospace fonts in rust guide.

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Previously, any font template that could not be found would return
an item from the last resort font family. Now, the last resort font
family is only searched if the entire list of supplied font families
is empty.
This commit is contained in:
Glenn Watson 2014-10-13 15:39:53 +10:00
parent 6317905342
commit a70850c261
2 changed files with 75 additions and 16 deletions
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37
components/gfx/font_cache_task.rs
View file

@ -71,13 +71,14 @@ impl FontFamily {
/// Commands that the FontContext sends to the font cache task.
pub enum Command {
GetFontTemplate(String, FontTemplateDescriptor, Sender<Reply>),
GetLastResortFontTemplate(FontTemplateDescriptor, Sender<Reply>),
AddWebFont(String, Url, Sender<()>),
Exit(Sender<()>),
}
/// Reply messages sent from the font cache task to the FontContext caller.
pub enum Reply {
GetFontTemplateReply(Arc<FontTemplateData>),
GetFontTemplateReply(Option<Arc<FontTemplateData>>),
}
/// The font cache task itself. It maintains a list of reference counted
@ -109,12 +110,11 @@ impl FontCache {
match msg {
GetFontTemplate(family, descriptor, result) => {
let maybe_font_template = self.get_font_template(&family, &descriptor);
let font_template = match maybe_font_template {
Some(font_template) => font_template,
None => self.get_last_resort_template(&descriptor),
};
result.send(GetFontTemplateReply(font_template));
result.send(GetFontTemplateReply(maybe_font_template));
}
GetLastResortFontTemplate(descriptor, result) => {
let font_template = self.get_last_resort_font_template(&descriptor);
result.send(GetFontTemplateReply(Some(font_template)));
}
AddWebFont(family_name, url, result) => {
let maybe_resource = load_whole_resource(&self.resource_task, url.clone());
@ -197,7 +197,8 @@ impl FontCache {
}
}
fn get_font_template(&mut self, family: &String, desc: &FontTemplateDescriptor) -> Option<Arc<FontTemplateData>> {
fn get_font_template(&mut self, family: &String, desc: &FontTemplateDescriptor)
-> Option<Arc<FontTemplateData>> {
let transformed_family_name = self.transform_family(family);
let mut maybe_template = self.find_font_in_web_family(&transformed_family_name, desc);
if maybe_template.is_none() {
@ -206,7 +207,8 @@ impl FontCache {
maybe_template
}
fn get_last_resort_template(&mut self, desc: &FontTemplateDescriptor) -> Arc<FontTemplateData> {
fn get_last_resort_font_template(&mut self, desc: &FontTemplateDescriptor)
-> Arc<FontTemplateData> {
let last_resort = get_last_resort_font_families();
for family in last_resort.iter() {
@ -259,7 +261,7 @@ impl FontCacheTask {
}
pub fn get_font_template(&self, family: String, desc: FontTemplateDescriptor)
-> Arc<FontTemplateData> {
-> Option<Arc<FontTemplateData>> {
let (response_chan, response_port) = channel();
self.chan.send(GetFontTemplate(family, desc, response_chan));
@ -273,6 +275,21 @@ impl FontCacheTask {
}
}
pub fn get_last_resort_font_template(&self, desc: FontTemplateDescriptor)
-> Arc<FontTemplateData> {
let (response_chan, response_port) = channel();
self.chan.send(GetLastResortFontTemplate(desc, response_chan));
let reply = response_port.recv();
match reply {
GetFontTemplateReply(data) => {
data.unwrap()
}
}
}
pub fn add_web_font(&self, family: String, url: Url) {
let (response_chan, response_port) = channel();
self.chan.send(AddWebFont(family, url, response_chan));