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vangel76andClaude Opus 5.5
b9e859fe3f
The mask coverage was rasterised into the layer-sized buffer and then blurred, so coverage outside the layer counted as 0: a feathered mask past the layer edge faded at that edge, and one just outside the layer gave nothing (the comment said the buffer grew; nothing grew it). A feathered mask is now rasterised on a grid padded by the blur's whole support (3 sigma + 3 for the Gaussian, the box radius for a linear falloff), blurred there and cropped back to the buffer. Wide feathers (sigma > 32 px) use a grid coarser per axis so the blur spans ~16 grid pixels, which keeps the allocation near the buffer's size (feather 1000 on 1920x1080: a 160x134 grid instead of ~20 Mpx); the grid is capped, feathers are clamped and non-finite ones ignored. Unfeathered masks and masks inside the layer give the same coverage as before. The GPU uses these CPU masks (adjustment footprint, masked sources): no GPU change. Tests: case 398 of the .aep corpus rebuilt in the project model (red solid, adjustment layer with a default Gradient Ramp, a 1920x200 mask below the layer, feather 1000) within 3 levels of the Gaussian and within 14 of After Effects' render; a mask right of a solid, a mask larger than the layer (edges stay opaque), linear falloff, half resolution, and huge or broken feathers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>