User feedback round 1 on the splat regions:
- Double counting: per-node gradient discs stacked with the edge-stroke
dilation wherever nodes sat on edges (hub hot spots). A cluster is its
CONNECTED skeleton — the region is now the dilated intra-cluster edge
network ONLY (round caps make line-end points discs), per the user's
definition. No per-node discs at all.
- The 'blur' was no blur: bilinear upscale of a 256px bitmap produced
tent-ramp chunkiness at zoom (the low-quality-JPEG look). Now a REAL
blur: 3 box-blur rounds on the premultiplied bitmap (separable running
sum, pure + unit-tested; premultiply keeps halos out of transparent
space). The upscale now has nothing left to make chunky.
- Live dev controls: number inputs (not sliders) in the settings panel —
dilation (screen px at fit), blur (bitmap px), bitmap resolution,
edge alpha. Session-only React state, never persisted; the renderer's
sanitizeRegionTuning makes bad/empty values safe. Verified end-to-end
through the real input (dilation 28 → 60 took effect).
- Premultiply un-recovery bug caught live: c = pm/a*255, not pm/a (the
first version rounded every color to black; regions rendered as
dark blobs with alpha 185).
- Region canvas: willReadFrequently (Chrome keeps it on the CPU for the
per-rebuild getImageData); defaults dilation 55 → 28 after measuring
screen coverage (63% → 55%).
- Perf: 120fps sustained through a drag with blur + rebuild-every-3rd-
frame (45 frames / 360ms measured), zero idle frames after settle.
amosblomqvist
60686d7831