Remove microjustification

crates/typst-layout/src/inline/line.rs

@@ -71,16 +71,6 @@ impl Line<'_> {
         count
     }
 
-    /// How many glyphs are in the text where we can insert micro-amounts
-    /// of additional space when encountering underfull lines.
-    fn microjustifiables(&self) -> usize {
-        let mut count = 0;
-        for shaped in self.items.iter().filter_map(Item::text) {
-            count += shaped.microjustifiables();
-        }
-        count
-    }
-
     /// How much the line can stretch.
     pub fn stretchability(&self) -> Abs {
         self.items
@@ -482,21 +472,12 @@ pub fn commit(
     let fr = line.fr();
     let mut justification_ratio = 0.0;
     let mut extra_justification = Abs::zero();
-    let mut extra_microjustification = Abs::zero();
 
     let shrinkability = line.shrinkability();
     let stretchability = line.stretchability();
     if remaining < Abs::zero() && shrinkability > Abs::zero() {
         // Attempt to reduce the length of the line, using shrinkability.
-        let microjustifiables = line.microjustifiables();
-
-        extra_microjustification = (remaining / microjustifiables as f64)
-            .max(p.config.microtype.max_retract.abs);
-
-        justification_ratio = ((remaining
-            - extra_microjustification * microjustifiables as f64)
-            / shrinkability)
-            .max(-1.0);
+        justification_ratio = (remaining / shrinkability).max(-1.0);
 
         remaining = (remaining + shrinkability).min(Abs::zero());
     } else if line.justify && fr.is_zero() {
@@ -507,17 +488,10 @@ pub fn commit(
         }
 
         let justifiables = line.justifiables();
-        let microjustifiables = line.microjustifiables();
 
         if justifiables > 0 && remaining > Abs::zero() {
             // Underfull line, distribute the extra space.
-            extra_microjustification = (remaining / microjustifiables as f64)
-                .min(p.config.microtype.max_expand.abs);
-
-            extra_justification = (remaining
-                - extra_microjustification * microjustifiables as f64)
-                / justifiables as f64;
-
+            extra_justification = remaining / justifiables as f64;
             remaining = Abs::zero();
         }
     }
@@ -559,7 +533,6 @@ pub fn commit(
                     &p.spans,
                     justification_ratio,
                     extra_justification,
-                    extra_microjustification,
                 );
                 push(&mut offset, frame);
             }

crates/typst-layout/src/inline/shaping.rs

@@ -84,8 +84,6 @@ pub struct ShapedGlyph {
     pub c: char,
     /// Whether this glyph is justifiable for CJK scripts.
     pub is_justifiable: bool,
-    /// Whether this glyph is allowed additional kerning for microjustification.
-    pub is_microjustifiable: bool,
     /// The script of the glyph.
     pub script: Script,
 }
@@ -110,11 +108,6 @@ impl ShapedGlyph {
         self.is_justifiable
     }
 
-    /// Whether the glyph is microjustifiable.
-    pub fn is_microjustifiable(&self) -> bool {
-        self.is_microjustifiable
-    }
-
     /// Whether the glyph is part of Chinese or Japanese script (i.e. CJ, not CJK).
     pub fn is_cj_script(&self) -> bool {
         is_cj_script(self.c, self.script)
@@ -153,7 +146,11 @@ impl ShapedGlyph {
             || self.c.is_ascii_digit()
     }
 
-    pub fn base_adjustability(&self, style: CjkPunctStyle, microtype: Microtype) -> Adjustability {
+    pub fn base_adjustability(
+        &self,
+        style: CjkPunctStyle,
+        microtype: Microtype,
+    ) -> Adjustability {
         let width = self.x_advance;
         if self.is_space() {
             Adjustability {
@@ -227,7 +224,6 @@ impl<'a> ShapedText<'a> {
         spans: &SpanMapper,
         justification_ratio: f64,
         extra_justification: Abs,
-        extra_microjustification: Abs,
     ) -> Frame {
         let (top, bottom) = self.measure(engine);
         let size = Size::new(self.width, top + bottom);
@@ -273,10 +269,6 @@ impl<'a> ShapedText<'a> {
                         justification_right +=
                             Em::from_length(extra_justification, self.size)
                     }
-                    if shaped.is_microjustifiable() {
-                        justification_right +=
-                            Em::from_length(extra_microjustification, self.size)
-                    }
 
                     frame.size_mut().x += justification_left.at(self.size)
                         + justification_right.at(self.size);
@@ -391,12 +383,6 @@ impl<'a> ShapedText<'a> {
         self.glyphs.iter().filter(|g| g.is_justifiable()).count()
     }
 
-    /// How many glyphs are in the text that are allowed extra kerning for the
-    /// use of justification when encountering underfull lines.
-    pub fn microjustifiables(&self) -> usize {
-        self.glyphs.iter().filter(|g| g.is_microjustifiable()).count()
-    }
-
     /// Whether the last glyph is a CJK character which should not be justified
     /// on line end.
     pub fn cjk_justifiable_at_last(&self) -> bool {
@@ -518,7 +504,6 @@ impl<'a> ShapedText<'a> {
                 safe_to_break: true,
                 c: '-',
                 is_justifiable: false,
-                is_microjustifiable: false,
                 script: Script::Common,
             };
             match side {
@@ -904,7 +889,6 @@ fn shape_segment<'a>(
                     x_advance,
                     Adjustability::default().stretchability,
                 ),
-                is_microjustifiable: false,
                 script,
             });
         } else {
@@ -997,7 +981,6 @@ fn shape_tofus(ctx: &mut ShapingContext, base: usize, text: &str, font: Font) {
                 x_advance,
                 Adjustability::default().stretchability,
             ),
-            is_microjustifiable: false,
             script,
         });
     };