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gfx: Implement font-stretch
per CSS3-FONTS § 3.3 in the Core Text
font backend.
This commit is contained in:
parent
aba5c16091
commit
abddfa742f
8 changed files with 101 additions and 44 deletions
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@ -2,14 +2,14 @@
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use style::computed_values::font_weight;
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use font::FontHandleMethods;
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use platform::font_context::FontContextHandle;
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use platform::font::FontHandle;
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use platform::font_template::FontTemplateData;
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use std::borrow::ToOwned;
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use std::sync::{Arc, Weak};
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use font::FontHandleMethods;
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use style::computed_values::{font_stretch, font_weight};
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/// Describes how to select a font from a given family.
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/// This is very basic at the moment and needs to be
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@ -18,13 +18,17 @@ use font::FontHandleMethods;
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#[derive(Clone, Copy)]
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pub struct FontTemplateDescriptor {
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pub weight: font_weight::T,
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pub stretch: font_stretch::T,
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pub italic: bool,
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}
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impl FontTemplateDescriptor {
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pub fn new(weight: font_weight::T, italic: bool) -> FontTemplateDescriptor {
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#[inline]
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pub fn new(weight: font_weight::T, stretch: font_stretch::T, italic: bool)
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-> FontTemplateDescriptor {
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FontTemplateDescriptor {
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weight: weight,
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stretch: stretch,
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italic: italic,
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}
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}
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@ -33,7 +37,8 @@ impl FontTemplateDescriptor {
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impl PartialEq for FontTemplateDescriptor {
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fn eq(&self, other: &FontTemplateDescriptor) -> bool {
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self.weight.is_bold() == other.weight.is_bold() &&
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self.italic == other.italic
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self.stretch == other.stretch &&
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self.italic == other.italic
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}
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}
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@ -44,7 +49,8 @@ pub struct FontTemplate {
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identifier: String,
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descriptor: Option<FontTemplateDescriptor>,
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weak_ref: Option<Weak<FontTemplateData>>,
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strong_ref: Option<Arc<FontTemplateData>>, // GWTODO: Add code path to unset the strong_ref for web fonts!
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// GWTODO: Add code path to unset the strong_ref for web fonts!
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strong_ref: Option<Arc<FontTemplateData>>,
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is_valid: bool,
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}
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@ -82,8 +88,10 @@ impl FontTemplate {
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}
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/// Get the data for creating a font if it matches a given descriptor.
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pub fn get_if_matches(&mut self, fctx: &FontContextHandle,
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requested_desc: &FontTemplateDescriptor) -> Option<Arc<FontTemplateData>> {
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pub fn get_if_matches(&mut self,
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fctx: &FontContextHandle,
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requested_desc: &FontTemplateDescriptor)
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-> Option<Arc<FontTemplateData>> {
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// The font template data can be unloaded when nothing is referencing
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// it (via the Weak reference to the Arc above). However, if we have
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// already loaded a font, store the style information about it separately,
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@ -97,42 +105,42 @@ impl FontTemplate {
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None
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}
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},
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None => {
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if self.is_valid {
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let data = self.get_data();
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let handle: Result<FontHandle, ()> = FontHandleMethods::new_from_template(fctx, data.clone(), None);
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match handle {
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Ok(handle) => {
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let actual_desc = FontTemplateDescriptor::new(handle.boldness(),
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handle.is_italic());
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let desc_match = actual_desc == *requested_desc;
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None if self.is_valid => {
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let data = self.get_data();
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let handle: Result<FontHandle, ()> =
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FontHandleMethods::new_from_template(fctx, data.clone(), None);
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match handle {
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Ok(handle) => {
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let actual_desc = FontTemplateDescriptor::new(handle.boldness(),
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handle.stretchiness(),
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handle.is_italic());
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let desc_match = actual_desc == *requested_desc;
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self.descriptor = Some(actual_desc);
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self.is_valid = true;
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if desc_match {
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Some(data)
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} else {
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None
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}
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}
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Err(()) => {
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self.is_valid = false;
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debug!("Unable to create a font from template {}", self.identifier);
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self.descriptor = Some(actual_desc);
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self.is_valid = true;
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if desc_match {
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Some(data)
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} else {
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None
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}
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}
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} else {
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None
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Err(()) => {
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self.is_valid = false;
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debug!("Unable to create a font from template {}", self.identifier);
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None
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}
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}
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}
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None => None,
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}
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}
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/// Get the data for creating a font.
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pub fn get(&mut self) -> Option<Arc<FontTemplateData>> {
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match self.is_valid {
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true => Some(self.get_data()),
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false => None
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if self.is_valid {
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Some(self.get_data())
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} else {
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None
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}
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}
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@ -145,14 +153,13 @@ impl FontTemplate {
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None => None,
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};
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match maybe_data {
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Some(data) => data,
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None => {
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assert!(self.strong_ref.is_none());
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let template_data = Arc::new(FontTemplateData::new(self.identifier.as_slice(), None));
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self.weak_ref = Some(template_data.downgrade());
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template_data
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}
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if let Some(data) = maybe_data {
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return data
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}
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assert!(self.strong_ref.is_none());
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let template_data = Arc::new(FontTemplateData::new(self.identifier.as_slice(), None));
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self.weak_ref = Some(template_data.downgrade());
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template_data
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}
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}
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