Aliaksandr Kalenik 3c25d080b1 LibGfx: Move painting surface snapshots to PaintingSurface ...

ImmutableBitmap still owned the helper that read pixels from a
PaintingSurface and wrapped the result as an ImmutableBitmap. That kept
a surface readback operation attached to the type we are trying to
remove, even though the snapshot is really a property of the painting
surface.

Add PaintingSurface::snapshot_bitmap() as the explicit readback path.
The remaining callers now wrap that bitmap in ImmutableBitmap only at
the places that still need the old abstraction. Canvas serialization
also uses the same helper, so the BGRA8888 premultiplied snapshot
policy has a single owner.

2026-05-05 14:39:17 -05:00

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