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fix: correct viewport stretch and SHX plots

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Anchor the opposite viewport corner during grip and STRETCH resizing.
Match plotted stroke-font pen widths to the SDF atlas unless CTB overrides.

Closes #435
This commit is contained in:
Hakan Seven 2026-07-24 19:26:10 +03:00
commit ece5598372
4 changed files with 127 additions and 26 deletions
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18
src/scene/text/sdf_atlas.rs
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@ -105,6 +105,18 @@ const SPREAD_UNITS: f32 = 1.5;
/// built around. Scales with text height like the strokes themselves.
const PEN_HALF_UNITS: f32 = 0.35;
/// Nominal half-width of the SDF pen for a stroke glyph.
///
/// CPU exporters cannot sample the atlas, so they use this to stroke the same
/// LFF/SHX centrelines at the thickness shown on screen.
pub(crate) fn stroke_pen_half_units(bold: bool) -> f32 {
if bold {
PEN_HALF_UNITS * 1.7
} else {
PEN_HALF_UNITS
}
}
/// Upper bound on a single glyph tile's dimension (texels), a guard against a
/// pathologically wide/tall glyph blowing up the atlas.
const MAX_TILE_PX: u32 = 512;
@ -264,11 +276,7 @@ impl GlyphAtlas {
return *cached;
}
// Bold stroke glyphs bake with a wider pen band (same shapes, thicker).
let pen_half = if bold {
PEN_HALF_UNITS * 1.7
} else {
PEN_HALF_UNITS
};
let pen_half = stroke_pen_half_units(bold);
let face = Face::resolve(family);
let entry = face
.glyph(ch)