Files
photocraft/crates/engine/tests
Brennan StehlingandClaude Opus 5.5 2119158a5e perf: a pixel change damages only the tiles that changed; command rects become checked hints (#9329)
step_damage narrows a layer whose only change is in its surfaces (pixels, mask, type,
smart-object and fill caches) to the bounding box of the tiles that differ: a merge walk of
the two tile maps, pointer compares only. A mask's tiles grow by its feather, all of them by
the layer's effects and the effects of the groups around it, never past the layer's whole
extents. A frame-spanning effect whose frame moved keeps the whole extents (#4053). Undo,
redo and History jumps get it for free: undoing a 60 px dab on a full-canvas layer redraws
its tiles, not the canvas, and so does a fill or filter on a small selection.

The painting commands' own damage rects go through one door, Session::hint_damage, which
intersects them with the edit's damage. Debug and test builds count a hint that misses a
changed tile in Session::damage_misses and log it; nothing panics. refresh_type_layers reports
step_damage instead of None.

Deleted: note_damage and layers_damage (identical to step_damage after layer.setProps and
layer.translate), note_inert_insert (step_damage already steps over inert layers, #1771),
and the engine's siblings_of they used.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-27 23:09:58 -07:00
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