| //---------------------------------------------------------------------------- | |
| // XYQ: 2006-01-22 Copied from AGG project. | |
| // TODO: This file uses intensive floating point operations, so it's NOT suitable | |
| // for platforms like Symbian OS. We need to change to FIX format. | |
| //---------------------------------------------------------------------------- | |
| //---------------------------------------------------------------------------- | |
| // Anti-Grain Geometry - Version 2.3 | |
| // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) | |
| // | |
| // Permission to copy, use, modify, sell and distribute this software | |
| // is granted provided this copyright notice appears in all copies. | |
| // This software is provided "as is" without express or implied | |
| // warranty, and with no claim as to its suitability for any purpose. | |
| // | |
| //---------------------------------------------------------------------------- | |
| // Contact: mcseem@antigrain.com | |
| // mcseemagg@yahoo.com | |
| // http://www.antigrain.com | |
| //---------------------------------------------------------------------------- | |
| // | |
| // Stroke generator | |
| // | |
| //---------------------------------------------------------------------------- | |
| #include "agg_vcgen_stroke.h" | |
| namespace pdfium | |
| { | |
| namespace agg | |
| { | |
| vcgen_stroke::vcgen_stroke() : | |
| m_src_vertices(), | |
| m_out_vertices(), | |
| m_width(0.5f), | |
| m_miter_limit(4 * 1.0f), | |
| m_inner_miter_limit(1.0f + 1.0f / 100), | |
| m_approx_scale(1.0f), | |
| m_line_cap(butt_cap), | |
| m_line_join(miter_join), | |
| m_inner_join(inner_miter), | |
| m_closed(0), | |
| m_status(initial), | |
| m_src_vertex(0), | |
| m_out_vertex(0) | |
| { | |
| } | |
| void vcgen_stroke::remove_all() | |
| { | |
| m_src_vertices.remove_all(); | |
| m_closed = 0; | |
| m_status = initial; | |
| } | |
| void vcgen_stroke::add_vertex(float x, float y, unsigned cmd) | |
| { | |
| m_status = initial; | |
| if(is_move_to(cmd)) { | |
| m_src_vertices.modify_last(vertex_dist_cmd(x, y, cmd)); | |
| } else { | |
| if(is_vertex(cmd)) { | |
| m_src_vertices.add(vertex_dist_cmd(x, y, cmd)); | |
| } else { | |
| m_closed = get_close_flag(cmd); | |
| } | |
| } | |
| } | |
| static inline void calc_butt_cap(float* cap, | |
| const vertex_dist& v0, | |
| const vertex_dist& v1, | |
| float len, | |
| float width) { | |
| float dx = (v1.y - v0.y) * width / len; | |
| float dy = (v1.x - v0.x) * width / len; | |
| cap[0] = v0.x - dx; | |
| cap[1] = v0.y + dy; | |
| cap[2] = v0.x + dx; | |
| cap[3] = v0.y - dy; | |
| } | |
| void vcgen_stroke::rewind(unsigned) | |
| { | |
| if(m_status == initial) { | |
| m_src_vertices.close(m_closed != 0); | |
| if(m_src_vertices.size() < 3) { | |
| m_closed = 0; | |
| } | |
| } | |
| m_status = ready; | |
| m_src_vertex = 0; | |
| m_out_vertex = 0; | |
| } | |
| unsigned vcgen_stroke::vertex(float* x, float* y) | |
| { | |
| unsigned cmd = path_cmd_line_to; | |
| line_join_e curj; | |
| while(!is_stop(cmd)) { | |
| switch(m_status) { | |
| case initial: | |
| rewind(0); | |
| case ready: | |
| if(m_src_vertices.size() < 2 + unsigned(m_closed != 0)) { | |
| cmd = path_cmd_stop; | |
| break; | |
| } | |
| m_status = m_closed ? outline1 : cap1; | |
| cmd = path_cmd_move_to; | |
| m_src_vertex = 0; | |
| m_out_vertex = 0; | |
| break; | |
| case cap1: | |
| stroke_calc_cap(m_out_vertices, | |
| m_src_vertices[0], | |
| m_src_vertices[1], | |
| m_src_vertices[0].dist, | |
| m_line_cap, | |
| m_width, | |
| m_approx_scale); | |
| m_src_vertex = 1; | |
| m_prev_status = outline1; | |
| m_status = out_vertices; | |
| m_out_vertex = 0; | |
| break; | |
| case cap2: | |
| stroke_calc_cap(m_out_vertices, | |
| m_src_vertices[m_src_vertices.size() - 1], | |
| m_src_vertices[m_src_vertices.size() - 2], | |
| m_src_vertices[m_src_vertices.size() - 2].dist, | |
| m_line_cap, | |
| m_width, | |
| m_approx_scale); | |
| m_prev_status = outline2; | |
| m_status = out_vertices; | |
| m_out_vertex = 0; | |
| break; | |
| case outline1: | |
| if(m_closed) { | |
| if(m_src_vertex >= m_src_vertices.size()) { | |
| m_prev_status = close_first; | |
| m_status = end_poly1; | |
| break; | |
| } | |
| } else { | |
| if(m_src_vertex >= m_src_vertices.size() - 1) { | |
| m_status = cap2; | |
| break; | |
| } | |
| } | |
| curj = m_src_vertices[m_src_vertex].cmd & path_flags_jr ? miter_join_round : m_line_join; | |
| stroke_calc_join(m_out_vertices, | |
| m_src_vertices.prev(m_src_vertex), | |
| m_src_vertices.curr(m_src_vertex), | |
| m_src_vertices.next(m_src_vertex), | |
| m_src_vertices.prev(m_src_vertex).dist, | |
| m_src_vertices.curr(m_src_vertex).dist, | |
| m_width, | |
| curj, | |
| m_inner_join, | |
| m_miter_limit, | |
| m_inner_miter_limit, | |
| m_approx_scale); | |
| ++m_src_vertex; | |
| m_prev_status = m_status; | |
| m_status = out_vertices; | |
| m_out_vertex = 0; | |
| break; | |
| case close_first: | |
| m_status = outline2; | |
| cmd = path_cmd_move_to; | |
| case outline2: | |
| if(m_src_vertex <= unsigned(m_closed == 0)) { | |
| m_status = end_poly2; | |
| m_prev_status = stop; | |
| break; | |
| } | |
| --m_src_vertex; | |
| curj = m_src_vertices[m_src_vertex].cmd & path_flags_jr ? miter_join_round : m_line_join; | |
| stroke_calc_join(m_out_vertices, | |
| m_src_vertices.next(m_src_vertex), | |
| m_src_vertices.curr(m_src_vertex), | |
| m_src_vertices.prev(m_src_vertex), | |
| m_src_vertices.curr(m_src_vertex).dist, | |
| m_src_vertices.prev(m_src_vertex).dist, | |
| m_width, | |
| curj, | |
| m_inner_join, | |
| m_miter_limit, | |
| m_inner_miter_limit, | |
| m_approx_scale); | |
| m_prev_status = m_status; | |
| m_status = out_vertices; | |
| m_out_vertex = 0; | |
| break; | |
| case out_vertices: | |
| if(m_out_vertex >= m_out_vertices.size()) { | |
| m_status = m_prev_status; | |
| } else { | |
| const point_type& c = m_out_vertices[m_out_vertex++]; | |
| *x = c.x; | |
| *y = c.y; | |
| return cmd; | |
| } | |
| break; | |
| case end_poly1: | |
| m_status = m_prev_status; | |
| return path_cmd_end_poly | path_flags_close | path_flags_ccw; | |
| case end_poly2: | |
| m_status = m_prev_status; | |
| return path_cmd_end_poly | path_flags_close | path_flags_cw; | |
| case stop: | |
| cmd = path_cmd_stop; | |
| break; | |
| } | |
| } | |
| return cmd; | |
| } | |
| } | |
| } // namespace pdfium |