Fade the draft into the sharp frame when a drag settles

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When a gesture stopped, the half-resolution draft was replaced by the
full-resolution frame in one step, a visible jump from soft to sharp.
FR-DSP-4 asks for a refinement that is smooth, not a jarring swap.

The canvas now keeps the last draft frame (`canvas-previous`) and draws
it over the sharp one, fading it out over 150 ms when the draft flag
clears. The fade costs no render: the draft is a refcount on the texture
it was drawn into, and the adjust pass ping-pongs between two output
targets, so the sharp frame is written into the other one. While a
gesture is drafting the layer is hidden and snapped opaque, so a new
drag shows its draft at once; past the fade it is hidden again, and a
settled canvas composites one image as before.

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dtourolle

2026-09-24 21:52:23 -04:00

parent 4642c77e18

commit ade627a5d0

4 changed files with 150 additions and 40 deletions

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docs/dev/traceability.md

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