Fix galley width calculation being off due to subpixel binning (#7972)

- fix for https://github.com/rerun-io/reality/pull/1075 The galleys row size was calculated by looking at the last glyphs pos_x, which got changed to be rounded to integers when we added subpixel binning. This introduced a subtle bug which caused the width of galleys to be slightly off. This PR fixes this by looking at the actual cursor position instead, which is not rounded. Also added a test to ensure this is correct. Previously, for the second and last line, the `x` was too close to the `0`. <img width="48" height="67" alt="image" src="https://github.com/user-attachments/assets/a69a4cc3-b3f3-4553-ab92-73cb2e7a358c" /> --------- Co-authored-by: lucasmerlin <8009393+lucasmerlin@users.noreply.github.com>
2026-08-29 04:40:03 -04:00 · 2026-03-12 13:49:16 +01:00
parent 8b90dc60c6
commit 14afefa252
118 changed files with 258 additions and 229 deletions
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--- a/crates/egui_kittest/tests/snapshots/test_tooltip_shown.png
+++ b/crates/egui_kittest/tests/snapshots/test_tooltip_shown.png
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--- a/crates/epaint/src/text/text_layout.rs
+++ b/crates/epaint/src/text/text_layout.rs
@@ -114,7 +114,7 @@ pub fn layout(fonts: &mut FontsImpl, pixels_per_point: f32, job: Arc<LayoutJob>)
    let intrinsic_size = calculate_intrinsic_size(point_scale, &job, &paragraphs);

    let mut elided = false;
-    let mut rows = rows_from_paragraphs(paragraphs, &job, &mut elided);
+    let mut rows = rows_from_paragraphs(paragraphs, &job, pixels_per_point, &mut elided);
    if elided && let Some(last_placed) = rows.last_mut() {
        let last_row = Arc::make_mut(&mut last_placed.row);
        replace_last_glyph_with_overflow_character(fonts, pixels_per_point, &job, last_row);
@@ -254,11 +254,12 @@ fn calculate_intrinsic_size(
 ) -> Vec2 {
    let mut intrinsic_size = Vec2::ZERO;
    for (idx, paragraph) in paragraphs.iter().enumerate() {
-        let width = paragraph
-            .glyphs
-            .last()
-            .map(|l| l.max_x())
-            .unwrap_or_default();
+        // Use the precise cursor position instead of `last_glyph.max_x()`,
+        // because glyph positions are pixel-snapped but the cursor tracks
+        // the exact subpixel advance. This ensures that when two galleys are
+        // placed side-by-side, the gap matches what it would be within a
+        // single galley.
+        let width = paragraph.cursor_x_px / point_scale.pixels_per_point;
        intrinsic_size.x = f32::max(intrinsic_size.x, width);

        let mut height = paragraph
@@ -279,6 +280,7 @@ fn calculate_intrinsic_size(
 fn rows_from_paragraphs(
    paragraphs: Vec<Paragraph>,
    job: &LayoutJob,
+    pixels_per_point: f32,
    elided: &mut bool,
 ) -> Vec<PlacedRow> {
    let num_paragraphs = paragraphs.len();
@@ -305,8 +307,11 @@ fn rows_from_paragraphs(
                ends_with_newline: !is_last_paragraph,
            });
        } else {
-            let paragraph_max_x = paragraph.glyphs.last().unwrap().max_x();
-            if paragraph_max_x <= job.effective_wrap_width() {
+            // Use precise cursor position for width instead of pixel-snapped
+            // `last_glyph.max_x()`, so that side-by-side galleys have the same
+            // spacing as characters within a single galley.
+            let paragraph_width = paragraph.cursor_x_px / pixels_per_point;
+            if paragraph_width <= job.effective_wrap_width() {
                // Early-out optimization: the whole paragraph fits on one row.
                rows.push(PlacedRow {
                    pos: pos2(0.0, f32::NAN),
@@ -314,7 +319,7 @@ fn rows_from_paragraphs(
                        section_index_at_start: paragraph.section_index_at_start,
                        glyphs: paragraph.glyphs,
                        visuals: Default::default(),
-                        size: vec2(paragraph_max_x, 0.0),
+                        size: vec2(paragraph_width, 0.0),
                    }),
                    ends_with_newline: !is_last_paragraph,
                });