3.20.1

Performance

• Drawing on an image with a gain map (an HDR photo) is much faster: drawBox() and drawCircle() only recompute the part of the map they cover, instead of the whole map for every call. 400 scanlines over a 1820x1820 Ultra HDR photo take 0.3 s instead of 5.8 s, with the same result.
• composite() onto or from an image with a gain map is up to twice as fast: 1820x1820 with a blend mode like 'add' takes 0.22 s instead of 0.48 s, with the same result. Gain maps stay in sync with the pixels as before.