Don't start subdividing active edges until we're sure an entire B-quad
will be emitted. Otherwise it messes up the parity. Fixes the bottom curve of the lowercase "p" in Open Sans when rendered with Loop-Blinn.
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@ -529,12 +529,17 @@ impl<'a> Partitioner<'a> {
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return emission_result
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}
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if !self.should_subdivide_active_edge_at(upper_active_edge_index, right_x) ||
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!self.should_subdivide_active_edge_at(lower_active_edge_index, right_x) {
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return emission_result
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}
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let upper_curve = self.subdivide_active_edge_at(upper_active_edge_index,
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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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if self.subdivide_active_edge_at(active_edge_index, right_x, SubdivisionType::Inside)
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.is_some() {
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if self.should_subdivide_active_edge_at(active_edge_index, right_x) {
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self.subdivide_active_edge_at(active_edge_index, right_x, SubdivisionType::Inside);
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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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@ -542,13 +547,11 @@ impl<'a> Partitioner<'a> {
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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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@ -1022,18 +1025,20 @@ impl<'a> Partitioner<'a> {
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}
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}
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fn should_subdivide_active_edge_at(&self, active_edge_index: u32, x: f32) -> bool {
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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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x - left_point_position.x >= f32::approx_epsilon()
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}
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/// Does *not* toggle parity. You must do this after calling this function.
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fn subdivide_active_edge_at(&mut self,
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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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-> Option<SubdividedActiveEdge> {
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-> 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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@ -1091,11 +1096,11 @@ impl<'a> Partitioner<'a> {
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}
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}
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Some(SubdividedActiveEdge {
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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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