_ConvertToInternal
clipping_rect _ConvertToInternal(const BRect& rect) const;
clipping_rect _ConvertToInternal(
region->fBounds = region->_ConvertToInternal(fBufferDesc->clip_bounds);
region->fData[c] = region->_ConvertToInternal(
fData[0] = fBounds = _ConvertToInternal(clipping);
clipping = _ConvertToInternal(clipping);
fBounds = _ConvertToInternal(rect);