Move sample operator functions to `ed_util_imbuf.c` and change common functions, so they can be used in image editor and sequencer. Reviewed By: campbellbarton Differential Revision: https://developer.blender.org/D7315
Move sample operator functions to `ed_util_imbuf.c` and change common functions, so they can be used in image editor and sequencer. Reviewed By: campbellbarton Differential Revision: https://developer.blender.org/D7315