accepts

True when this renderer can show frames of shape, asked before they exist: at open, to pass over a decoder whose frames it cannot show, and at attach, to refuse a renderer that cannot show the running decoder's frames.

The answer is about the renderer, not its present state, so it must not depend on a surface or a window being ready. A renderer that accepts a shape may still refuse a frame later, for example after it lost its surface. The default answers from supports and supportedHardwareSurfaces.