6aa11a304c
For historical reasons these were stored in sRGB space, which caused all kinds of complexity. * For image painting, it now properly uses the byte buffer colorspace instead of assuming sRGB or display colorspace. This can be more expensive, so there is a fast path for sRGB buffers (and for fixed brush colors). * Lots of code was changed to remove conversion when painting float images or vertex colors, and added when painting byte images. * For non-color data, there is now no colorspace conversion between the brush color and image pixels, and #143642 was basically reverted because of that. Compatibility notes: * Backwards compatibility is not perfect, as we can not determine if the brush has non-color data in isolation. We always convert sRGB to linear, and existing brushes configured with non-color data need to be manually fixed. * There is forward compatibility, the old sRGB value is still stored next to the scene linear value. Pull Request: https://projects.blender.org/blender/blender/pulls/144400
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