07580e71a6
Allocate float buffer outside of image buffer, so work-in-progress color space conversion doesn't interfere with other parts of blender. Covers most of cases -- since image buffer wouldn't have partially-update float buffer all the rest areas would be happy. However, if there're places which updates float buffer from byte buffer, it's still possible some WIP color space conversion is displayed on the screen. But what a heck someone will do such a crappy conversion anyway!