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dev-null-undefinedandClaude
e7cd00ef56
A windowed render dehazes with the whole frame's airlight, estimated on a 384 px proxy of the frame (`local::frame_airlight`). Every window asked for that proxy again, so every pan of a 1:1 view and every slider step while zoomed sampled the whole original down to it on the CPU: ~200 ms of CPU on a 64 MP raw. The proxy (taken before white balance) is now kept for the last 4 (source fingerprint, frame, size); white balance, the dark channel and the percentile still run on it every time. Same pixels: the GPU window of `render_bench` is byte-identical. `optics::fingerprint` indexed the first pixel of an empty image; it now hashes only the dimensions then. render_bench ONLY=window GPU_ONLY=1 on a 64 MP Sony ILCE-7RM6 raw (RTX 4070 Ti SUPER, 4-CPU quota), CPU time: pan 208-212 -> 9-11 ms, exposure change 200-204 -> 4 ms, NR change 211-217 -> 13 ms. Co-Authored-By: Claude <noreply@anthropic.com>