- case BC_A8: return 1;
- case BC_A16: return 1;
- case BC_A_FLOAT: return 1;
- case BC_RGB888: return 3;
- case BC_RGBA8888: return 4;
- case BC_RGB161616: return 3;
- case BC_RGBA16161616: return 4;
- case BC_YUV888: return 3;
- case BC_YUVA8888: return 4;
- case BC_YUV161616: return 3;
- case BC_YUVA16161616: return 4;
- case BC_AYUV16161616: return 4;
- case BC_YUV101010: return 3;
- case BC_RGB_FLOAT: return 3;
- case BC_RGBA_FLOAT: return 4;
- case BC_RGB_FLOATP: return 3;
- case BC_RGBA_FLOATP: return 4;
- case BC_GREY8: return 1;
- case BC_GREY16: return 1;