rawprepare: raw mosaic: sepBlack
fixup -1
rawprepare: scaling for raw mosaic buffers [SSE]

FIXME: figure alignment!
rawprepare: scaling for floating point buffers [SSE]
Rawprepare iop: implement OpenCL kernel (1f)!
Rawprepare iop: implement OpenCL kernel (4f)!
x-trans?