BitmapDrawer: fix Wu antialiasing alpha values in DrawHairline()

HaikuArchives / ArtPaint

ArtPaint is a painting and image processing program.

https://haikuarchives.github.io/ArtPaint/

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Closed dsizzle closed 1 year ago

dsizzle commented 1 year ago

Fixes #586

(also the same line-drawing is used for rotated unfilled Rectangles and the Hairy Brush so those look better too)

humdingerb commented 1 year ago

Looks much better! Merge when ready. :)

dsizzle commented 1 year ago

merged, thanks for taking a look!