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/* This Source Code Form is subject to the terms of the Mozilla Public
* 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 font::{Font, FontDescriptor, FontGroup, FontHandleMethods, SelectorPlatformIdentifier};
use font::{SpecifiedFontStyle, UsedFontStyle};
use font_list::FontList;
use platform::font::FontHandle;
use platform::font_context::FontContextHandle;
use azure::azure_hl::BackendType;
use collections::hashmap::HashMap;
use servo_util::cache::{Cache, LRUCache};
use servo_util::time::ProfilerChan;
use std::rc::Rc;
use std::cell::RefCell;
/// Information needed to create a font context.
#[deriving(Clone)]
pub struct FontContextInfo {
/// The painting backend we're using.
pub backend: BackendType,
/// Whether we need a font list.
pub needs_font_list: bool,
/// A channel up to the profiler.
pub profiler_chan: ProfilerChan,
}
pub trait FontContextHandleMethods {
fn create_font_from_identifier(&self, ~str, UsedFontStyle) -> Result<FontHandle, ()>;
}
pub struct FontContext {
pub instance_cache: LRUCache<FontDescriptor, Rc<RefCell<Font>>>,
pub font_list: Option<FontList>, // only needed by layout
pub group_cache: LRUCache<SpecifiedFontStyle, Rc<RefCell<FontGroup>>>,
pub handle: FontContextHandle,
pub backend: BackendType,
pub generic_fonts: HashMap<~str,~str>,
pub profiler_chan: ProfilerChan,
}
impl FontContext {
pub fn new(info: FontContextInfo) -> FontContext {
let handle = FontContextHandle::new();
let font_list = if info.needs_font_list {
Some(FontList::new(&handle, info.profiler_chan.clone()))
} else {
None
};
// TODO: Allow users to specify these.
let mut generic_fonts = HashMap::with_capacity(5);
generic_fonts.insert(~"serif", ~"Times New Roman");
generic_fonts.insert(~"sans-serif", ~"Arial");
generic_fonts.insert(~"cursive", ~"Apple Chancery");
generic_fonts.insert(~"fantasy", ~"Papyrus");
generic_fonts.insert(~"monospace", ~"Menlo");
FontContext {
instance_cache: LRUCache::new(10),
font_list: font_list,
group_cache: LRUCache::new(10),
handle: handle,
backend: info.backend,
generic_fonts: generic_fonts,
profiler_chan: info.profiler_chan.clone(),
}
}
pub fn get_resolved_font_for_style(&mut self, style: &SpecifiedFontStyle)
-> Rc<RefCell<FontGroup>> {
match self.group_cache.find(style) {
Some(fg) => {
debug!("font group cache hit");
fg
},
None => {
debug!("font group cache miss");
let fg = self.create_font_group(style);
self.group_cache.insert(style.clone(), fg.clone());
fg
}
}
}
pub fn get_font_by_descriptor(&mut self, desc: &FontDescriptor)
-> Result<Rc<RefCell<Font>>, ()> {
match self.instance_cache.find(desc) {
Some(f) => {
debug!("font cache hit");
Ok(f)
},
None => {
debug!("font cache miss");
let result = self.create_font_instance(desc);
match result.clone() {
Ok(ref font) => {
self.instance_cache.insert(desc.clone(), font.clone());
}, _ => {}
};
result
}
}
}
fn transform_family(&self, family: &~str) -> ~str {
debug!("(transform family) searching for `{:s}`", family.as_slice());
match self.generic_fonts.find(family) {
None => family.to_owned(),
Some(mapped_family) => (*mapped_family).clone()
}
}
fn create_font_group(&mut self, style: &SpecifiedFontStyle) -> Rc<RefCell<FontGroup>> {
let mut fonts = ~[];
debug!("(create font group) --- starting ---");
// TODO(Issue #193): make iteration over 'font-family' more robust.
for family in style.families.iter() {
let transformed_family_name = self.transform_family(family);
debug!("(create font group) transformed family is `{:s}`", transformed_family_name);
let mut found = false;
let result = match self.font_list {
Some(ref mut fl) => {
let font_in_family = fl.find_font_in_family(&transformed_family_name, style);
match font_in_family {
Some(font_entry) => {
let font_id =
SelectorPlatformIdentifier(font_entry.handle.face_identifier());
let font_desc = FontDescriptor::new((*style).clone(), font_id);
Some(font_desc)
},
None => {
None
}
}
}
None => None,
};
match result {
Some(ref result) => {
found = true;
let instance = self.get_font_by_descriptor(result);
let _ = instance.map(|font| fonts.push(font.clone()));
},
_ => {}
}
if !found {
debug!("(create font group) didn't find `{:s}`", transformed_family_name);
}
}
if fonts.len() == 0 {
let last_resort = FontList::get_last_resort_font_families();
for family in last_resort.iter() {
let font_desc = match self.font_list {
Some(ref mut font_list) => {
let font_desc = {
let font_entry = font_list.find_font_in_family(family, style);
match font_entry {
Some(v) => {
let font_id =
SelectorPlatformIdentifier(v.handle.face_identifier());
Some(FontDescriptor::new((*style).clone(), font_id))
},
None => {
None
}
}
};
font_desc
},
None => {
None
}
};
match font_desc {
Some(ref fd) => {
let instance = self.get_font_by_descriptor(fd);
let _ = instance.map(|font| fonts.push(font.clone()));
},
None => { }
};
}
}
assert!(fonts.len() > 0);
// TODO(Issue #179): Split FontStyle into specified and used styles
let used_style = (*style).clone();
debug!("(create font group) --- finished ---");
Rc::new(
RefCell::new(
FontGroup::new(style.families.to_owned(), &used_style, fonts)))
}
fn create_font_instance(&self, desc: &FontDescriptor) -> Result<Rc<RefCell<Font>>, ()> {
return match &desc.selector {
// TODO(Issue #174): implement by-platform-name font selectors.
&SelectorPlatformIdentifier(ref identifier) => {
let result_handle = self.handle.create_font_from_identifier((*identifier).clone(),
desc.style.clone());
result_handle.and_then(|handle| {
Ok(
Rc::new(
RefCell::new(
Font::new_from_adopted_handle(self,
handle,
&desc.style,
self.backend))))
})
}
};
}
}
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