Transitioning between video priority and graphics priority

In a video receiver, a method for blending graphics data, the method comprising:

• receiving input video data and input dynamic metadata for the input video data, wherein the input video data is at a video dynamic range;
• receiving input graphics data and input static metadata wherein the input graphics data is at a graphics dynamic range;
• receiving display identification data from a target display to which the video receiver is linked over a video interface;
• receiving a blending priority map characterizing a per-pixel priority of output pixels in an image generated based on blending the input video data and the input graphics data;
• and
• upon receiving from the target display indication that it supports per-pixel blending:
• sending the input video data, the input dynamic metadata, the input graphics data, the input static metadata, and the blending priority map to the target display for rendering a blended version of the input video and graphics data at a target dynamic range.

In a video receiver, a method for mapping input data to a target display, the method comprising:

• receiving a blended video input comprising blended video and graphics data, input dynamic metadata for the video data in the blended video input, and input static metadata for the graphics data in the blended video input;
• receiving a target display dynamic range from a target display to which the video receiver is linked over a video interface;
• receiving a blending priority map characterizing the per-pixel priority of the pixels in the blended video input;
• generating using the input dynamic metadata data a video tone-mapping function to map pixels in the blended video input to output data in the target dynamic range;
• generating using the input static metadata data a graphics tone-mapping function to map the pixels in the blended video input to output data in the target dynamic range;
• rendering blended video output data at the target dynamic range based on the blended video input data, the video tone-mapping function, the graphics tone-mapping function, and the blending priority map;
• and
• sending the blended video output data to the target display.