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//! Data structs for a font index.
use super::{
shared_data::{SharedData, WeakSharedData},
types::{FamilyId, FontId, SourceId},
};
use crate::util::string::SmallString;
use std::path::PathBuf;
use std::sync::RwLock;
use std::time::SystemTime;
use swash::{CacheKey, Attributes, Stretch, Style, Weight};
#[derive(Clone)]
pub struct FamilyData {
pub id: FamilyId,
pub name: SmallString,
pub fonts: Vec<FamilyFontData>,
pub has_stretch: bool,
}
#[derive(Clone)]
pub struct FamilyFontData {
pub id: FontId,
pub stretch: Stretch,
pub weight: Weight,
pub style: Style,
}
impl FamilyData {
pub fn contains(&self, stretch: Stretch, weight: Weight, style: Style) -> bool {
for font in &self.fonts {
if font.stretch == stretch && font.weight == weight && font.style == style {
return true;
}
}
false
}
/// Returns the font that most closely matches the specified attributes.
pub fn query(&self, attributes: Attributes) -> Option<FontId> {
let style = attributes.style();
let weight = attributes.weight();
let stretch = attributes.stretch();
let mut min_stretch_dist = i32::MAX;
let mut matching_stretch = Stretch::NORMAL;
if self.has_stretch {
if stretch <= Stretch::NORMAL {
for font in &self.fonts {
let val = font.stretch;
let font_stretch = if val > Stretch::NORMAL {
val.raw() as i32 - Stretch::NORMAL.raw() as i32
+ Stretch::ULTRA_EXPANDED.raw() as i32
} else {
val.raw() as i32
};
let offset = (font_stretch - stretch.raw() as i32).abs();
if offset < min_stretch_dist {
min_stretch_dist = offset;
matching_stretch = val;
}
}
} else {
for font in &self.fonts {
let val = font.stretch;
let font_stretch = if val < Stretch::NORMAL {
val.raw() as i32 - Stretch::NORMAL.raw() as i32
+ Stretch::ULTRA_EXPANDED.raw() as i32
} else {
val.raw() as i32
};
let offset = (font_stretch - stretch.raw() as i32).abs();
if offset < min_stretch_dist {
min_stretch_dist = offset;
matching_stretch = val;
}
}
}
}
let mut matching_style;
match style {
Style::Normal => {
matching_style = Style::Italic;
for font in self.fonts.iter().filter(|f| f.stretch == matching_stretch) {
let val = font.style;
match val {
Style::Normal => {
matching_style = style;
break;
}
Style::Oblique(_) => {
matching_style = val;
}
_ => {}
}
}
}
Style::Oblique(_) => {
matching_style = Style::Normal;
for font in self.fonts.iter().filter(|f| f.stretch == matching_stretch) {
let val = font.style;
match val {
Style::Oblique(_) => {
matching_style = style;
break;
}
Style::Italic => {
matching_style = val;
}
_ => {}
}
}
}
Style::Italic => {
matching_style = Style::Normal;
for font in self.fonts.iter().filter(|f| f.stretch == matching_stretch) {
let val = font.style;
match val {
Style::Italic => {
matching_style = style;
break;
}
Style::Oblique(_) => {
matching_style = val;
}
_ => {}
}
}
}
}
// If the desired weight is inclusively between 400 and 500
if weight >= Weight(400) && weight <= Weight(500) {
// weights greater than or equal to the target weight are checked
// in ascending order until 500 is hit and checked
for font in self.fonts.iter().filter(|f| {
f.stretch == matching_stretch
&& f.style == matching_style
&& f.weight >= weight
&& f.weight <= Weight(500)
}) {
return Some(font.id);
}
// followed by weights less than the target weight in descending
// order
for font in self.fonts.iter().rev().filter(|f| {
f.stretch == matching_stretch && f.style == matching_style && f.weight < weight
}) {
return Some(font.id);
}
// followed by weights greater than 500, until a match is found
return self
.fonts
.iter()
.filter(|f| {
f.stretch == matching_stretch
&& f.style == matching_style
&& f.weight > Weight(500)
})
.map(|f| f.id)
.next();
// If the desired weight is less than 400
} else if weight < Weight(400) {
// weights less than or equal to the desired weight are checked in
// descending order
for font in self.fonts.iter().rev().filter(|f| {
f.stretch == matching_stretch && f.style == matching_style && f.weight <= weight
}) {
return Some(font.id);
}
// followed by weights above the desired weight in ascending order
// until a match is found
return self
.fonts
.iter()
.filter(|f| {
f.stretch == matching_stretch && f.style == matching_style && f.weight > weight
})
.map(|f| f.id)
.next();
// If the desired weight is greater than 500
} else {
// weights greater than or equal to the desired weight are checked
// in ascending order
for font in self.fonts.iter().filter(|f| {
f.stretch == matching_stretch && f.style == matching_style && f.weight >= weight
}) {
return Some(font.id);
}
// followed by weights below the desired weight in descending order
// until a match is found
return self
.fonts
.iter()
.rev()
.filter(|f| {
f.stretch == matching_stretch && f.style == matching_style && f.weight < weight
})
.map(|f| f.id)
.next();
}
}
}
#[derive(Copy, Clone)]
pub struct FontData {
pub id: FontId,
pub family: FamilyId,
pub source: SourceId,
pub index: u32,
pub offset: u32,
pub attributes: Attributes,
pub key: CacheKey,
}
pub struct FileData {
pub path: PathBuf,
pub timestamp: SystemTime,
pub mmap: bool,
pub status: RwLock<FileDataStatus>,
}
impl FileData {
pub fn get(&self) -> Option<SharedData> {
{
let status = self.status.read().unwrap();
match *status {
FileDataStatus::Error => return None,
FileDataStatus::Present(ref data) => {
if let Some(data) = data.upgrade() {
return Some(data);
}
}
FileDataStatus::Empty => {}
}
}
let mut status = self.status.write().unwrap();
// If we raced with another writer, the data may have already been
// loaded, so check again.
match *status {
FileDataStatus::Error => return None,
FileDataStatus::Present(ref data) => {
if let Some(data) = data.upgrade() {
return Some(data);
}
}
_ => {}
}
if let Ok(data) = SharedData::from_file(&self.path, self.mmap, Some(self.timestamp)) {
*status = FileDataStatus::Present(data.downgrade());
Some(data)
} else {
*status = FileDataStatus::Error;
None
}
}
}
pub enum FileDataStatus {
Empty,
Present(WeakSharedData),
Error,
}
pub struct SourceData {
pub id: SourceId,
pub kind: SourceKind,
}
impl SourceData {
pub fn get(&self) -> Option<SharedData> {
match &self.kind {
SourceKind::File(file) => file.get(),
SourceKind::Memory(data) => Some(data.clone()),
}
}
}
pub enum SourceKind {
Memory(SharedData),
File(FileData),
}