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gfx: Implement font-stretch per CSS3-FONTS § 3.3 in the Core Text

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font backend.
This commit is contained in:
Patrick Walton 2015-01-01 11:21:27 -05:00
parent aba5c16091
commit abddfa742f
8 changed files with 101 additions and 44 deletions
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87
components/gfx/font_template.rs
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@ -2,14 +2,14 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use style::computed_values::font_weight;
use font::FontHandleMethods;
use platform::font_context::FontContextHandle;
use platform::font::FontHandle;
use platform::font_template::FontTemplateData;
use std::borrow::ToOwned;
use std::sync::{Arc, Weak};
use font::FontHandleMethods;
use style::computed_values::{font_stretch, font_weight};
/// Describes how to select a font from a given family.
/// This is very basic at the moment and needs to be
@ -18,13 +18,17 @@ use font::FontHandleMethods;
#[derive(Clone, Copy)]
pub struct FontTemplateDescriptor {
pub weight: font_weight::T,
pub stretch: font_stretch::T,
pub italic: bool,
}
impl FontTemplateDescriptor {
pub fn new(weight: font_weight::T, italic: bool) -> FontTemplateDescriptor {
#[inline]
pub fn new(weight: font_weight::T, stretch: font_stretch::T, italic: bool)
-> FontTemplateDescriptor {
FontTemplateDescriptor {
weight: weight,
stretch: stretch,
italic: italic,
}
}
@ -33,7 +37,8 @@ impl FontTemplateDescriptor {
impl PartialEq for FontTemplateDescriptor {
fn eq(&self, other: &FontTemplateDescriptor) -> bool {
self.weight.is_bold() == other.weight.is_bold() &&
self.italic == other.italic
self.stretch == other.stretch &&
self.italic == other.italic
}
}
@ -44,7 +49,8 @@ pub struct FontTemplate {
identifier: String,
descriptor: Option<FontTemplateDescriptor>,
weak_ref: Option<Weak<FontTemplateData>>,
strong_ref: Option<Arc<FontTemplateData>>, // GWTODO: Add code path to unset the strong_ref for web fonts!
// GWTODO: Add code path to unset the strong_ref for web fonts!
strong_ref: Option<Arc<FontTemplateData>>,
is_valid: bool,
}
@ -82,8 +88,10 @@ impl FontTemplate {
}
/// Get the data for creating a font if it matches a given descriptor.
pub fn get_if_matches(&mut self, fctx: &FontContextHandle,
requested_desc: &FontTemplateDescriptor) -> Option<Arc<FontTemplateData>> {
pub fn get_if_matches(&mut self,
fctx: &FontContextHandle,
requested_desc: &FontTemplateDescriptor)
-> Option<Arc<FontTemplateData>> {
// The font template data can be unloaded when nothing is referencing
// it (via the Weak reference to the Arc above). However, if we have
// already loaded a font, store the style information about it separately,
@ -97,42 +105,42 @@ impl FontTemplate {
None
}
},
None => {
if self.is_valid {
let data = self.get_data();
let handle: Result<FontHandle, ()> = FontHandleMethods::new_from_template(fctx, data.clone(), None);
match handle {
Ok(handle) => {
let actual_desc = FontTemplateDescriptor::new(handle.boldness(),
handle.is_italic());
let desc_match = actual_desc == *requested_desc;
None if self.is_valid => {
let data = self.get_data();
let handle: Result<FontHandle, ()> =
FontHandleMethods::new_from_template(fctx, data.clone(), None);
match handle {
Ok(handle) => {
let actual_desc = FontTemplateDescriptor::new(handle.boldness(),
handle.stretchiness(),
handle.is_italic());
let desc_match = actual_desc == *requested_desc;
self.descriptor = Some(actual_desc);
self.is_valid = true;
if desc_match {
Some(data)
} else {
None
}
}
Err(()) => {
self.is_valid = false;
debug!("Unable to create a font from template {}", self.identifier);
self.descriptor = Some(actual_desc);
self.is_valid = true;
if desc_match {
Some(data)
} else {
None
}
}
} else {
None
Err(()) => {
self.is_valid = false;
debug!("Unable to create a font from template {}", self.identifier);
None
}
}
}
None => None,
}
}
/// Get the data for creating a font.
pub fn get(&mut self) -> Option<Arc<FontTemplateData>> {
match self.is_valid {
true => Some(self.get_data()),
false => None
if self.is_valid {
Some(self.get_data())
} else {
None
}
}
@ -145,14 +153,13 @@ impl FontTemplate {
None => None,
};
match maybe_data {
Some(data) => data,
None => {
assert!(self.strong_ref.is_none());
let template_data = Arc::new(FontTemplateData::new(self.identifier.as_slice(), None));
self.weak_ref = Some(template_data.downgrade());
template_data
}
if let Some(data) = maybe_data {
return data
}
assert!(self.strong_ref.is_none());
let template_data = Arc::new(FontTemplateData::new(self.identifier.as_slice(), None));
self.weak_ref = Some(template_data.downgrade());
template_data
}
}