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Smallcaps, sub- and superscript, ligature ctrls...

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Martin Haug 2021-10-28 21:25:03 +02:00 committed by Laurenz
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184
NOTICE
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@ -104,6 +104,190 @@ FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
OTHER DEALINGS IN THE FONT SOFTWARE.
================================================================================
================================================================================
The Apache License Version 2.0 applies to:
* Roboto fonts in fonts/Roboto-*.ttf
(https://github.com/googlefonts/roboto)
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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The GUST Font License Version 1.0 applies to:

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8
src/library/mod.rs
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@ -174,11 +174,3 @@ dynamic! {
Value::Relative(v) => Self::Linear(v.into()),
Value::Linear(v) => Self::Linear(v),
}
castable! {
Spacing: "linear or fractional",
Value::Length(v) => Self::Linear(v.into()),
Value::Relative(v) => Self::Linear(v.into()),
Value::Linear(v) => Self::Linear(v),
Value::Fractional(v) => Self::Fractional(v),
}

13
src/library/page.rs
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@ -3,14 +3,13 @@ use crate::style::{Paper, PaperClass};
/// `page`: Configure pages.
pub fn page(ctx: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let paper = match args.named::<Spanned<Str>>("paper")?.or_else(|| args.find()) {
Some(name) => match Paper::from_name(&name.v) {
None => bail!(name.span, "invalid paper name"),
paper => paper,
},
None => None,
};
castable! {
Paper: "string",
Value::Str(string) => Paper::from_name(&string)
.ok_or("invalid paper name")?,
}
let paper = args.named::<Paper>("paper")?.or_else(|| args.find());
let width = args.named("width")?;
let height = args.named("height")?;
let margins = args.named("margins")?;

8
src/library/spacing.rs
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@ -22,3 +22,11 @@ pub enum Spacing {
/// A length that is the fraction of the remaining free space in the parent.
Fractional(Fractional),
}
castable! {
Spacing: "linear or fractional",
Value::Length(v) => Self::Linear(v.into()),
Value::Relative(v) => Self::Linear(v.into()),
Value::Linear(v) => Self::Linear(v),
Value::Fractional(v) => Self::Fractional(v),
}

244
src/library/text.rs
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@ -1,18 +1,22 @@
use std::borrow::Cow;
use std::ops::Range;
use rustybuzz::UnicodeBuffer;
use rustybuzz::{Feature, Tag, UnicodeBuffer};
use super::prelude::*;
use crate::font::{Face, FaceId, FontFamily, FontVariant};
use crate::geom::{Dir, Em, Length, Point, Size};
use crate::style::{Style, TextStyle};
use crate::style::{
FontFeatures, NumberPosition, NumberStyle, NumberWidth, Style, TextStyle,
};
use crate::util::SliceExt;
/// `font`: Configure the font.
pub fn font(ctx: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
struct FontDef(Rc<Vec<FontFamily>>);
struct FamilyDef(Rc<Vec<String>>);
struct FeatureList(Vec<(String, u32)>);
struct StylisticSet(Option<u8>);
castable! {
FontDef: "font family or array of font families",
@ -38,11 +42,73 @@ pub fn font(ctx: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
)),
}
castable! {
StylisticSet: "none or integer",
Value::None => Self(None),
Value::Int(v) => match v {
1..=20 => Self(Some(v as u8)),
_ => Err("must be between 1 and 20")?,
},
}
castable! {
NumberStyle: "auto or string",
Value::Auto => Self::Auto,
Value::Str(string) => match string.as_str() {
"lining" => Self::Lining,
"old-style" => Self::OldStyle,
_ => Err(r#"expected "lining" or "old-style""#)?,
},
}
castable! {
NumberWidth: "auto or string",
Value::Auto => Self::Auto,
Value::Str(string) => match string.as_str() {
"proportional" => Self::Proportional,
"tabular" => Self::Tabular,
_ => Err(r#"expected "proportional" or "tabular""#)?,
},
}
castable! {
NumberPosition: "string",
Value::Str(string) => match string.as_str() {
"normal" => Self::Normal,
"subscript" => Self::Subscript,
"superscript" => Self::Superscript,
_ => Err(r#"expected "normal", "subscript" or "superscript""#)?,
},
}
castable! {
FeatureList: "array of strings or dictionary mapping tags to integers",
Value::Array(values) => Self(values
.into_iter()
.filter_map(|v| v.cast().ok())
.map(|string: Str| (string.to_lowercase(), 1))
.collect()),
Value::Dict(values) => Self(values
.into_iter()
.filter_map(|(k, v)| {
if let Ok(value) = v.cast::<i64>() {
Some((k.to_lowercase(), value as u32))
} else {
None
}
})
.collect()),
}
let list = args.named("family")?.or_else(|| {
let families: Vec<_> = args.all().collect();
(!families.is_empty()).then(|| FontDef(Rc::new(families)))
});
let serif = args.named("serif")?;
let sans_serif = args.named("sans-serif")?;
let monospace = args.named("monospace")?;
let fallback = args.named("fallback")?;
let size = args.named::<Linear>("size")?.or_else(|| args.find());
let style = args.named("style")?;
let weight = args.named("weight")?;
@ -50,43 +116,34 @@ pub fn font(ctx: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let fill = args.named("fill")?.or_else(|| args.find());
let top_edge = args.named("top-edge")?;
let bottom_edge = args.named("bottom-edge")?;
let serif = args.named("serif")?;
let sans_serif = args.named("sans-serif")?;
let monospace = args.named("monospace")?;
let fallback = args.named("fallback")?;
let kerning = args.named("kerning")?;
let smallcaps = args.named("smallcaps")?;
let alternates = args.named("alternates")?;
let stylistic_set = args.named("stylistic-set")?;
let ligatures = args.named("ligatures")?;
let discretionary_ligatures = args.named("discretionary-ligatures")?;
let historical_ligatures = args.named("historical-ligatures")?;
let number_style = args.named("number-style")?;
let number_width = args.named("number-width")?;
let number_position = args.named("number-position")?;
let slashed_zero = args.named("slashed-zero")?;
let fractions = args.named("fractions")?;
let features = args.named("features")?;
let body = args.find::<Template>();
macro_rules! set {
($target:expr => $source:expr) => {
if let Some(v) = $source {
$target = v;
}
};
}
let f = move |style_: &mut Style| {
let text = style_.text_mut();
if let Some(size) = size {
text.size = size.resolve(text.size);
}
if let Some(style) = style {
text.variant.style = style;
}
if let Some(weight) = weight {
text.variant.weight = weight;
}
if let Some(stretch) = stretch {
text.variant.stretch = stretch;
}
if let Some(top_edge) = top_edge {
text.top_edge = top_edge;
}
if let Some(bottom_edge) = bottom_edge {
text.bottom_edge = bottom_edge;
}
if let Some(fill) = fill {
text.fill = Paint::Color(fill);
}
if let Some(FontDef(list)) = &list {
text.families_mut().list = list.clone();
}
@ -103,8 +160,39 @@ pub fn font(ctx: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
text.families_mut().monospace = monospace.clone();
}
if let Some(fallback) = fallback {
text.fallback = fallback;
if let Some(size) = size {
text.size = size.resolve(text.size);
}
if let Some(fill) = fill {
text.fill = Paint::Color(fill);
}
set!(text.fallback => fallback);
set!(text.variant.style => style);
set!(text.variant.weight => weight);
set!(text.variant.stretch => stretch);
set!(text.top_edge => top_edge);
set!(text.bottom_edge => bottom_edge);
set!(text.features_mut().kerning => kerning);
set!(text.features_mut().smallcaps => smallcaps);
set!(text.features_mut().alternates => alternates);
set!(text.features_mut().ligatures.standard => ligatures);
set!(text.features_mut().ligatures.discretionary => discretionary_ligatures);
set!(text.features_mut().ligatures.historical => historical_ligatures);
set!(text.features_mut().numbers.style => number_style);
set!(text.features_mut().numbers.width => number_width);
set!(text.features_mut().numbers.position => number_position);
set!(text.features_mut().numbers.slashed_zero => slashed_zero);
set!(text.features_mut().numbers.fractions => fractions);
if let Some(StylisticSet(stylistic_set)) = stylistic_set {
text.features_mut().stylistic_set = stylistic_set;
}
if let Some(FeatureList(features)) = &features {
text.features_mut().raw = features.clone();
}
};
@ -135,6 +223,7 @@ pub fn shape<'a>(
style.families(),
None,
dir,
&tags(&style.features),
);
}
@ -320,6 +409,7 @@ fn shape_segment<'a>(
mut families: impl Iterator<Item = &'a str> + Clone,
mut first_face: Option<FaceId>,
dir: Dir,
tags: &[rustybuzz::Feature],
) {
// Select the font family.
let (face_id, fallback) = loop {
@ -354,7 +444,7 @@ fn shape_segment<'a>(
// Shape!
let mut face = ctx.fonts.get(face_id);
let buffer = rustybuzz::shape(face.ttf(), &[], buffer);
let buffer = rustybuzz::shape(face.ttf(), tags, buffer);
let infos = buffer.glyph_infos();
let pos = buffer.glyph_positions();
@ -427,6 +517,7 @@ fn shape_segment<'a>(
families.clone(),
first_face,
dir,
tags,
);
face = ctx.fonts.get(face_id);
@ -475,3 +566,82 @@ fn measure(
(Size::new(width, top + bottom), top)
}
/// Collect the tags of the OpenType features to apply.
fn tags(features: &FontFeatures) -> Vec<Feature> {
let mut tags = vec![];
let mut feat = |tag, value| {
tags.push(Feature::new(Tag::from_bytes(tag), value, ..));
};
// Features that are on by default in Harfbuzz are only added if disabled.
if !features.kerning {
feat(b"kern", 0);
}
// Features that are off by default in Harfbuzz are only added if enabled.
if features.smallcaps {
feat(b"smcp", 1);
}
if features.alternates {
feat(b"salt", 1);
}
let set_tag;
if let Some(set) = features.stylistic_set {
if matches!(set, 1 ..= 20) {
set_tag = [b's', b's', b'0' + set / 10, b'0' + set % 10];
feat(&set_tag, 1);
}
}
if !features.ligatures.standard {
feat(b"liga", 0);
feat(b"clig", 0);
}
if features.ligatures.discretionary {
feat(b"dlig", 1);
}
if features.ligatures.historical {
feat(b"hilg", 1);
}
match features.numbers.style {
NumberStyle::Auto => {}
NumberStyle::Lining => feat(b"lnum", 1),
NumberStyle::OldStyle => feat(b"onum", 1),
}
match features.numbers.width {
NumberWidth::Auto => {}
NumberWidth::Proportional => feat(b"pnum", 1),
NumberWidth::Tabular => feat(b"tnum", 1),
}
match features.numbers.position {
NumberPosition::Normal => {}
NumberPosition::Subscript => feat(b"subs", 1),
NumberPosition::Superscript => feat(b"sups", 1),
}
if features.numbers.slashed_zero {
feat(b"zero", 1);
}
if features.numbers.fractions {
feat(b"frac", 1);
}
for (tag, value) in features.raw.iter() {
tags.push(Feature::new(
Tag::from_bytes_lossy(tag.as_bytes()),
*value,
..,
))
}
tags
}

122
src/style/mod.rs
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@ -136,6 +136,8 @@ pub struct TextStyle {
/// A list of font families with generic class definitions (the final
/// family list also depends on `monospace`).
pub families: Rc<FamilyStyle>,
/// OpenType features.
pub features: Rc<FontFeatures>,
/// Whether 300 extra font weight should be added to what is defined by the
/// `variant`.
pub strong: bool,
@ -197,6 +199,11 @@ impl TextStyle {
pub fn families_mut(&mut self) -> &mut FamilyStyle {
Rc::make_mut(&mut self.families)
}
/// Access the font `features` mutably.
pub fn features_mut(&mut self) -> &mut FontFeatures {
Rc::make_mut(&mut self.features)
}
}
impl Default for TextStyle {
@ -212,6 +219,7 @@ impl Default for TextStyle {
bottom_edge: VerticalFontMetric::Baseline,
fill: Paint::Color(Color::Rgba(RgbaColor::BLACK)),
families: Rc::new(FamilyStyle::default()),
features: Rc::new(FontFeatures::default()),
strong: false,
emph: false,
monospace: false,
@ -250,3 +258,117 @@ impl Default for FamilyStyle {
}
}
}
/// Whether various kinds of ligatures should appear.
#[derive(Debug, Clone, Eq, PartialEq, Hash)]
pub struct FontFeatures {
/// Whether to apply kerning ("kern").
pub kerning: bool,
/// Whether the text should use small caps. ("smcp")
pub smallcaps: bool,
/// Whether to apply stylistic alternates. ("salt")
pub alternates: bool,
/// Which stylistic set to apply. ("ss00" - "ss20")
pub stylistic_set: Option<u8>,
/// Configuration of ligature features.
pub ligatures: LigatureFeatures,
/// Configuration of numbers features.
pub numbers: NumberFeatures,
/// Raw OpenType features to apply.
pub raw: Vec<(String, u32)>,
}
impl Default for FontFeatures {
fn default() -> Self {
Self {
kerning: true,
smallcaps: false,
alternates: false,
stylistic_set: None,
ligatures: LigatureFeatures::default(),
numbers: NumberFeatures::default(),
raw: vec![],
}
}
}
/// Whether various kinds of ligatures should appear.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub struct LigatureFeatures {
/// Standard ligatures. ("liga", "clig")
pub standard: bool,
/// Ligatures that should be used sparringly. ("dlig")
pub discretionary: bool,
/// Historical ligatures. ("hlig")
pub historical: bool,
}
impl Default for LigatureFeatures {
fn default() -> Self {
Self {
standard: true,
discretionary: false,
historical: false,
}
}
}
/// Defines the style of numbers.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub struct NumberFeatures {
/// Whether to use lining or old-style numbers.
pub style: NumberStyle,
/// Whether to use proportional or tabular numbers.
pub width: NumberWidth,
/// How to position numbers vertically.
pub position: NumberPosition,
/// Whether to have a slash through the zero glyph. ("zero")
pub slashed_zero: bool,
/// Whether to convert fractions. ("frac")
pub fractions: bool,
}
impl Default for NumberFeatures {
fn default() -> Self {
Self {
style: NumberStyle::Auto,
width: NumberWidth::Auto,
position: NumberPosition::Normal,
slashed_zero: false,
fractions: false,
}
}
}
/// How numbers / figures look.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum NumberStyle {
/// Select the font's preference.
Auto,
/// Numbers that fit well with capital text. ("lnum")
Lining,
/// Numbers that fit well into flow of upper- and lowercase text. ("onum")
OldStyle,
}
/// The width of numbers / figures.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum NumberWidth {
/// Select the font's preference.
Auto,
/// Number widths are glyph specific. ("pnum")
Proportional,
/// All numbers are of equal width / monospaced. ("tnum")
Tabular,
}
/// How to position numbers.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum NumberPosition {
/// Numbers are positioned on the same baseline as text.
Normal,
/// Numbers are smaller and placed at the bottom. ("subs")
Subscript,
/// Numbers are smaller and placed at the top. ("sups")
Superscript,
}

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@ -0,0 +1,65 @@
// Test OpenType features.
---
// Test turning kerning off.
#font(kerning: true)[Tq] \
#font(kerning: false)[Tq]
---
// Test smallcaps.
#font("Roboto")
#font(smallcaps: true)[Smallcaps]
---
// Test alternates and stylistic sets.
#font("IBM Plex Serif")
a vs #font(alternates: true)[a] \
ß vs #font(stylistic-set: 5)[ß]
---
// Test ligatures.
fi vs. #font(ligatures: false)[No fi] \
---
// Test number style.
#font("Roboto")
#font(number-style: "old-style") 0123456789 \
#font(number-style: auto)[0123456789]
---
// Test number width.
#font("Roboto")
#font(number-width: "proportional")[0123456789] \
#font(number-width: "tabular")[3456789123] \
#font(number-width: "tabular")[0123456789]
---
// Test number position.
#font("IBM Plex Sans")
#font(number-position: "normal")[C2H4] \
#font(number-position: "subscript")[C2H4] \
#font(number-position: "superscript")[C2H4]
---
// Test extra number stuff.
#font("IBM Plex Sans")
0 vs. #font(slashed-zero: true)[0] \
1/2 vs. #font(fractions: true)[1/2]
---
// Test raw features.
#font("Roboto")
#font(features: ("smcp",))[Smcp] \
fi vs. #font(features: (liga: 0))[No fi]
---
// Error: 22-24 must be between 1 and 20
#font(stylistic-set: 25)
---
// Error: 21-32 expected "lining" or "old-style"
#font(number-style: "different")
---
// Error: 17-22 expected array of strings or dictionary mapping tags to integers, found boolean
#font(features: false)