Raw channels are borrowed, ZIP planes are un-predicted in place in the inflated buffer,
the 32-bit un-predictor uses one scratch row, the layer mask tests the rect per row
instead of per pixel (and skips a constant factor of 1.0), and a placed-layer bake
solves the quad once and hoists per-triangle invariants. Output is bit-identical;
tests compare against the replaced implementations and count the avoided work.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
