3 people ddf6696dce Pencil: no 8-bit dither on aliased strokes, one flat colour at partial opacity (#3990) ...

The 8-bit stroke dither (render.rs `dither8`) ran on every stroke, including
aliased ones. An aliased stroke paints each pixel by the same amount, so it
has no gradient to band; dithering only scattered it over neighbouring
levels. A 1 px Pencil line of 219/41/61 at 30% opacity over white came out
as four colours (244/191/197, 245/191/197, 244/190/196, ...), and a
foreground between 8-bit levels did the same at 100%. Photoshop's Pencil
paints one value, and pixel art relies on it: a tolerance-0 Magic Wand or
Paint Bucket and Indexed Color palettes trip on the grain.

Composite now skips the dither when the brush is aliased (Pencil, Eraser
Pencil and Block modes). Soft brushes keep it.

Test: an_aliased_stroke_at_partial_opacity_is_one_flat_colour (fails
before the fix at pixel 5). photocraft-paint 96/96, photocraft-engine
1529/1529, ui-egui pencil 13/13, clippy -D warnings and fmt clean.

Co-authored-by: cloudalister <ngnlif3@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-12 18:10:29 -04:00

..

examples

Format: adopt the craft-family rustfmt.toml and format the workspace

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src

Pencil: no 8-bit dither on aliased strokes, one flat colour at partial opacity (#3990)

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Cargo.toml

more algorithms, progress

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