1fc6a5b9bd
Technically the regression was caused by #124472 which made it so duplicating ImBuf allocates the exact amount of memory needed to hold the pixels, while before IMB_dupImBuf() would leave the float buffer over-allocated for images that are less than 4 channels per pixel. At the same time IMB_scalefastImBuf() was hard-coded to use 4 channels per pixels, for both byte and float buffers. It did not crash in Blender 4.1 as it was accessing memory that is over-allocated, but it also did not generate proper preview. This fix makes the IMB_scalefastImBuf() to operate on an arbitrary number of channels in the float buffer. Pull Request: https://projects.blender.org/blender/blender/pulls/126234
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