Adds a Picture to the scene.
The picture is rasterized at the given offset.
Source
void addPicture(Offset offset, Picture picture, { bool isComplexHint: false, bool willChangeHint: false }) {
int hints = 0;
if (isComplexHint)
hints |= 1;
if (willChangeHint)
hints |= 2;
_addPicture(offset.dx, offset.dy, picture, hints);
}