Method and apparatus for video coding

An apparatus, comprising:

• processing circuitry configured to:
• decode prediction information of a coding unit in a current picture that is a part of a video bitstream;
• determine whether a luma block and a chroma block associated with the coding unit have different partitioning trees based on the prediction information;
• in response to the luma block and the chroma block associated with the coding unit having different partitioning trees,
• determine whether the luma block is coded in intra block copy (IBC) mode based on a first IBC flag included in the prediction information;
• determine whether the chroma block is coded in the IBC mode based on one of the first IBC flag, a second IBC flag included in the prediction information, and a default mode;
• and
• reconstruct the current coding unit based on the luma block and the chroma block.

A non-transitory computer-readable storage medium storing instructions which, when executed by at least one processor, cause the at least one processor to perform:

• decoding prediction information of a coding unit in a current picture that is a part of a video bitstream;
• determining whether a luma block and a chroma block associated with the coding unit have different partitioning trees based on the prediction information;
• in response to the luma block and the chroma block associated with the coding unit having different partitioning trees,
• determining whether the luma block is coded in intra block copy (IBC) mode based on a first IBC flag included in the prediction information;
• determining whether the chroma block is coded in the IBC mode based on one of the first IBC flag, a second IBC flag included in the prediction information, and a default mode;
• and
• reconstructing the current coding unit based on the luma block and the chroma block.