04cb3c1bbd
Histogram was calculated by copying the rendered image, transforming it into display space, and calculating the histogram on that. On large resolutions, this copy+transform+free of the temporary image was taking up majority of the time. Especially for default use case when the display transform is a no-op. Change the code so that display transform, if needed, is done directly inside histogram calculation, without needing a full-size temporary image. Performance of histogram calculation, on Ryzen 5950X (Windows), on a 4K resolution image, with default color management settings: - PNG (SDR): 3.9 -> 0.9ms - EXR (HDR): 41.3 -> 6.3ms With display colorspace (P3) that is different than the sequencer colorspace (sRGB): - PNG (SDR): 25.3 -> 11.3ms - EXR (HDR): 64.9 -> 10.6ms It also fixes calculation of histogram on float (HDR) images that have alpha channel; the histogram was wrongly calculated on premultiplied color values, which was not consistent with how it was calculated on the byte images. Pull Request: https://projects.blender.org/blender/blender/pulls/143175
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