Create fewer useless B-vertices
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@ -220,17 +220,26 @@ impl<'a> Partitioner<'a> {
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{
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let active_edge = &mut self.active_edges[active_edge_index as usize];
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let endpoint_position = self.endpoints[active_edge.right_endpoint_index as usize]
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.position;
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// If we already made a B-vertex point for this endpoint, reuse it instead of making a
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// new one.
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let old_left_position =
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self.b_vertex_positions[active_edge.left_vertex_index as usize];
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let should_update = (endpoint_position - old_left_position).square_length() >
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f32::approx_epsilon();
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if should_update {
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active_edge.left_vertex_index = self.b_vertex_loop_blinn_data.len() as u32;
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active_edge.control_point_vertex_index = active_edge.left_vertex_index + 1;
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let endpoint_position = self.endpoints[active_edge.right_endpoint_index as usize]
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.position;
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self.b_vertex_positions.push(endpoint_position);
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self.b_vertex_path_ids.push(self.path_id);
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self.b_vertex_loop_blinn_data.push(BVertexLoopBlinnData::new(
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active_edge.endpoint_kind()));
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active_edge.toggle_parity();
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}
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if active_edge.left_to_right {
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active_edge.right_endpoint_index = next_endpoint_index;
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@ -281,6 +290,8 @@ impl<'a> Partitioner<'a> {
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let endpoint = &self.endpoints[endpoint_index as usize];
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// TODO(pcwalton): Collapse the two duplicate endpoints that this will create together if
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// possible (i.e. if they have the same parity).
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self.emit_b_quads_around_active_edge(active_edge_indices[0], endpoint.position.x);
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self.emit_b_quads_around_active_edge(active_edge_indices[1], endpoint.position.x);
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@ -521,18 +532,22 @@ impl<'a> Partitioner<'a> {
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right_x,
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SubdivisionType::Upper);
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for active_edge_index in (upper_active_edge_index + 1)..lower_active_edge_index {
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self.subdivide_active_edge_at(active_edge_index, right_x, SubdivisionType::Inside);
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if self.subdivide_active_edge_at(active_edge_index, right_x, SubdivisionType::Inside)
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.is_some() {
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self.active_edges[active_edge_index as usize].toggle_parity();
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}
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}
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let lower_curve = self.subdivide_active_edge_at(lower_active_edge_index,
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right_x,
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SubdivisionType::Lower);
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if let (Some(upper_curve), Some(lower_curve)) = (upper_curve, lower_curve) {
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self.emit_b_quads(upper_active_edge_index,
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lower_active_edge_index,
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&upper_curve,
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&lower_curve,
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0);
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}
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emission_result
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}
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@ -1008,19 +1023,23 @@ impl<'a> Partitioner<'a> {
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active_edge_index: u32,
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x: f32,
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subdivision_type: SubdivisionType)
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-> SubdividedActiveEdge {
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-> Option<SubdividedActiveEdge> {
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let left_curve_left = self.active_edges[active_edge_index as usize].left_vertex_index;
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let left_point_position = self.b_vertex_positions[left_curve_left as usize];
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if x - left_point_position.x < f32::approx_epsilon() {
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// Too thin to make a difference. Forget it.
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return None
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}
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let t = self.solve_active_edge_t_for_x(x, &self.active_edges[active_edge_index as usize]);
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let bottom = subdivision_type == SubdivisionType::Lower;
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let active_edge = &mut self.active_edges[active_edge_index as usize];
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let left_curve_left = active_edge.left_vertex_index;
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let left_curve_control_point_vertex_index;
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match active_edge.control_point_vertex_index {
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u32::MAX => {
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let path_id = self.b_vertex_path_ids[left_curve_left as usize];
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let left_point_position = self.b_vertex_positions[left_curve_left as usize];
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let right_point = self.endpoints[active_edge.right_endpoint_index as usize]
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.position;
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let middle_point = left_point_position.to_vector().lerp(right_point.to_vector(), t);
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@ -1068,11 +1087,11 @@ impl<'a> Partitioner<'a> {
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}
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}
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SubdividedActiveEdge {
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Some(SubdividedActiveEdge {
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left_curve_left: left_curve_left,
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left_curve_control_point: left_curve_control_point_vertex_index,
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middle_point: active_edge.left_vertex_index,
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}
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})
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}
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fn prev_endpoint_of(&self, endpoint_index: u32) -> u32 {
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