SWF Shape Record (swf_shape_record)

/* if f_shape_record_type = 0 & f_end_of_shape = 0
  then that's the end of the list of shape records */
struct swf_shape_record_end {
	unsigned		f_shape_record_type : 1;
	unsigned		f_end_of_shape : 5;
};

/* f_shape_record_type = 0 & at least one of the following five bits is not zero
  then change style, fill and position setup */
struct swf_shape_record_setup {
	unsigned		f_shape_record_type : 1;
	if(f_tag == DefineShape) {
		unsigned	f_shape_reserved : 1;		/* always zero */
	}
	else {
		unsigned	f_shape_has_new_styles : 1;
	}
	unsigned		f_shape_has_line_style : 1;
	unsigned		f_shape_has_fill_style1 : 1;
	unsigned		f_shape_has_fill_style0 : 1;
	unsigned		f_shape_has_move_to : 1;
	if(f_shape_has_move_to) {
		unsigned	f_shape_move_size : 5;
		signed twips	f_shape_move_x : f_shape_move_size;
		signed twips	f_shape_move_y : f_shape_move_size;
	}
	if(f_shape_has_fill_style0) {
		unsigned	f_shape_fill_style0 : f_fill_bits_count;
	}
	if(f_shape_has_fill_style1) {
		unsigned	f_shape_fill_style1 : f_fill_bits_count;
	}
	if(f_shape_has_line_style) {
		unsigned	f_shape_line_style : f_line_bits_count;
	}
	if(f_shape_has_new_styles) {
		swf_styles	f_styles;
	}
};

/* f_shape_record_type = 1 -- edge record */
struct swf_shape_record_edge {
	unsigned		f_shape_record_type : 1;
	unsigned		f_shape_edge_type : 1;
	unsigned		f_shape_coord_size : 4;
	f_shape_coord_real_size = f_shape_coord_size + 2;
	if(f_shape_edge_type == 0) {
		signed twips	f_shape_control_delta_x : f_shape_coord_real_size;
		signed twips	f_shape_control_delta_y : f_shape_coord_real_size;
		signed twips	f_shape_anchor_delta_x : f_shape_coord_real_size;
		signed twips	f_shape_anchor_delta_y : f_shape_coord_real_size;
	}
	else {
		unsigned	f_shape_line_has_x_and_y : 1;
		if(f_shape_line_has_x_and_y == 1) {
			signed twips	f_shape_delta_x : f_shape_coord_real_size;
			signed twips	f_shape_delta_y : f_shape_coord_real_size;
		}
		else {
			unsigned	f_shape_line_has_x_or_y : 1;
			if(f_shape_line_has_x_or_y == 0) {
				signed twips	f_shape_delta_x : f_shape_coord_real_size;
			}
			else {
				signed twips	f_shape_delta_y : f_shape_coord_real_size;
			}
		}
	}
};

union swf_shape_record {
	swf_shape_record_end	f_shape_end;
	swf_shape_record_setup	f_shape_setup;
	swf_shape_record_edge	f_shape_edge;
};

• 1. From my tests with the official Macromedia Flash plugin, it looks that there is always a bit at this position. It seems however that it cannot be set to 1 in v1.0 of the tag (i.e. when the DefineShape tag is used).