fc64f48682
Glow effect was doing the correct thing algorithmically (separable gaussian blur), but it was 1) completely single-threaded, and 2) did operations in several passes over the source images, instead of doing them in one go. - Adds multi-threading to Glow effect. - Combines some operations, e.g. instead of IMB_buffer_float_from_byte followed by IMB_buffer_float_premultiply, do IMB_colormanagement_transform_from_byte_threaded which achieves the same, but more efficiently. - Simplifies the code: removing separate loops around image boundaries is both less code and slightly faster; use float4 vector type for more compact code; use Array classes instead of manual memory allocation, etc. - Removes IMB_buffer_float_unpremultiply and IMB_buffer_float_premultiply since they are no longer used by anything whatsoever. Applying Glow to 4K UHD sequencer output, on Windows Ryzen 5950X: - Blur distance 4: 935ms -> 109ms (8.5x faster) - Blur distance 20: 3526ms -> 336ms (10.5x faster) Same on Mac M1 Max: - Blur distance 4: 732ms -> 126ms (5.8x faster) - Blur distance 20: 3047ms -> 528ms (5.7x faster) Pull Request: https://projects.blender.org/blender/blender/pulls/115818
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