Further improvement for chroma mode coding

A method for video encoding, the method comprising:

• receiving video data comprising a current block in a current picture;
• determining a value of a first variable associated with the current block, wherein the first variable indicates whether a current mode is equal to a chroma from luma (CfL) mode;
• based on the first variable indicating that the current mode is not equal to the CfL mode, determining a second value associated with the current block, wherein the second value indicates whether the current mode is equal to a nominal mode of a luma block associated with the current block;
• determining additional information, the additional information representing one of:
• an index of delta angles, one or more parameters of the CfL mode, or one or more remaining nominal modes associated with the current block based on a value of the second variable;
• and
• encoding the current block based on a chroma intra prediction mode associated with the current block and based on the first variable, the second variable, and the additional information.

A non-transitory computer-readable storage medium storing a video bitstream that is generated by a video encoding method, the video encoding method comprising:

• receiving video data comprising a current block in a current picture;
• determining a value of a first variable associated with the current block, wherein the first variable indicates whether a current mode is equal to a chroma from luma (CfL) mode;
• based on the first variable indicating that the current mode is not equal to the CfL mode, determining a second value associated with the current block, wherein the second value indicates whether the current mode is equal to a nominal mode of a luma block associated with the current block;
• determining additional information, the additional information representing one of:
• an index of delta angles, one or more parameters of the CfL mode, or one or more remaining nominal modes associated with the current block based on a value of the second variable;
• and
• encoding the current block based on a chroma intra prediction mode associated with the current block and based on the first variable, the second variable, and the additional information.