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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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54
components/gfx/font_context.rs
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@ -45,6 +45,10 @@ struct LayoutFontCacheEntry {
font: Rc<RefCell<Font>>,
}
struct FallbackFontCacheEntry {
font: Rc<RefCell<Font>>,
}
/// A cached azure font (per render task) that
/// can be shared by multiple text runs.
struct RenderFontCacheEntry {
@ -63,6 +67,7 @@ pub struct FontContext {
/// TODO: See bug https://github.com/servo/servo/issues/3300.
layout_font_cache: Vec<LayoutFontCacheEntry>,
fallback_font_cache: Vec<FallbackFontCacheEntry>,
/// Strong reference as the render FontContext is (for now) recycled
/// per frame. TODO: Make this weak when incremental redraw is done.
@ -76,6 +81,7 @@ impl FontContext {
platform_handle: handle,
font_cache_task: font_cache_task,
layout_font_cache: vec!(),
fallback_font_cache: vec!(),
render_font_cache: vec!(),
}
}
@ -116,11 +122,10 @@ impl FontContext {
// TODO: The font context holds a strong ref to the cached fonts
// so they will never be released. Find out a good time to drop them.
let desc = FontTemplateDescriptor::new(style.weight, style.style == font_style::italic);
let mut fonts: Vec<Rc<RefCell<Font>>> = vec!();
for family in style.families.iter() {
let desc = FontTemplateDescriptor::new(style.weight, style.style == font_style::italic);
// GWTODO: Check on real pages if this is faster as Vec() or HashMap().
let mut cache_hit = false;
for cached_font_entry in self.layout_font_cache.iter() {
@ -138,10 +143,47 @@ impl FontContext {
if !cache_hit {
let font_template = self.font_cache_task.get_font_template(family.clone(), desc.clone());
let layout_font = Rc::new(RefCell::new(self.create_layout_font(font_template,
desc.clone(), style.pt_size, style.variant)));
self.layout_font_cache.push(LayoutFontCacheEntry {
family: family.clone(),
match font_template {
Some(font_template) => {
let layout_font = self.create_layout_font(font_template,
desc.clone(),
style.pt_size,
style.variant);
let layout_font = Rc::new(RefCell::new(layout_font));
self.layout_font_cache.push(LayoutFontCacheEntry {
family: family.clone(),
font: layout_font.clone(),
});
fonts.push(layout_font);
}
None => {}
}
}
}
// If unable to create any of the specified fonts, create one from the
// list of last resort fonts for this platform.
if fonts.len() == 0 {
let mut cache_hit = false;
for cached_font_entry in self.fallback_font_cache.iter() {
let cached_font = cached_font_entry.font.borrow();
if cached_font.descriptor == desc &&
cached_font.requested_pt_size == style.pt_size &&
cached_font.variant == style.variant {
fonts.push(cached_font_entry.font.clone());
cache_hit = true;
break;
}
}
if !cache_hit {
let font_template = self.font_cache_task.get_last_resort_font_template(desc.clone());
let layout_font = self.create_layout_font(font_template,
desc.clone(),
style.pt_size,
style.variant);
let layout_font = Rc::new(RefCell::new(layout_font));
self.fallback_font_cache.push(FallbackFontCacheEntry {
font: layout_font.clone(),
});
fonts.push(layout_font);