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[pdfium.git] / third_party / agg23 / agg_conv_adaptor_vcgen.h
1
2 //----------------------------------------------------------------------------
3 // Anti-Grain Geometry - Version 2.3
4 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
5 //
6 // Permission to copy, use, modify, sell and distribute this software
7 // is granted provided this copyright notice appears in all copies.
8 // This software is provided "as is" without express or implied
9 // warranty, and with no claim as to its suitability for any purpose.
10 //
11 //----------------------------------------------------------------------------
12 // Contact: mcseem@antigrain.com
13 //          mcseemagg@yahoo.com
14 //          http://www.antigrain.com
15 //----------------------------------------------------------------------------
16 #ifndef AGG_CONV_ADAPTOR_VCGEN_INCLUDED
17 #define AGG_CONV_ADAPTOR_VCGEN_INCLUDED
18 #include "agg_basics.h"
19 namespace agg
20 {
21 struct null_markers  {
22     void remove_all() {}
23     void add_vertex(FX_FLOAT, FX_FLOAT, unsigned) {}
24     void prepare_src() {}
25     void rewind(unsigned) {}
26     unsigned vertex(FX_FLOAT*, FX_FLOAT*)
27     {
28         return path_cmd_stop;
29     }
30 };
31 template<class VertexSource,
32          class Generator,
33          class Markers = null_markers> class conv_adaptor_vcgen 
34 {
35     enum status {
36         initial,
37         accumulate,
38         generate
39     };
40 public:
41     conv_adaptor_vcgen(VertexSource& source) :
42         m_source(&source),
43         m_status(initial)
44     {}
45     void set_source(VertexSource& source)
46     {
47         m_source = &source;
48     }
49     Generator& generator()
50     {
51         return m_generator;
52     }
53     const Generator& generator() const
54     {
55         return m_generator;
56     }
57     Markers& markers()
58     {
59         return m_markers;
60     }
61     const Markers& markers() const
62     {
63         return m_markers;
64     }
65     void rewind(unsigned path_id)
66     {
67         m_source->rewind(path_id);
68         m_status = initial;
69     }
70     unsigned vertex(FX_FLOAT* x, FX_FLOAT* y);
71 private:
72     conv_adaptor_vcgen(const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
73     const conv_adaptor_vcgen<VertexSource, Generator, Markers>&
74     operator = (const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
75     VertexSource* m_source;
76     Generator     m_generator;
77     Markers       m_markers;
78     status        m_status;
79     unsigned      m_last_cmd;
80     FX_FLOAT        m_start_x;
81     FX_FLOAT        m_start_y;
82 };
83 template<class VertexSource, class Generator, class Markers>
84 unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(FX_FLOAT* x, FX_FLOAT* y)
85 {
86     unsigned cmd = path_cmd_stop;
87     bool done = false;
88     while(!done) {
89         switch(m_status) {
90             case initial:
91                 m_markers.remove_all();
92                 m_last_cmd = m_source->vertex(&m_start_x, &m_start_y);
93                 m_status = accumulate;
94             case accumulate:
95                 if(is_stop(m_last_cmd)) {
96                     return path_cmd_stop;
97                 }
98                 m_generator.remove_all();
99                 m_generator.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
100                 m_markers.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
101                 for(;;) {
102                     cmd = m_source->vertex(x, y);
103                     if(is_vertex(cmd)) {
104                         m_last_cmd = cmd;
105                         if(is_move_to(cmd)) {
106                             m_start_x = *x;
107                             m_start_y = *y;
108                             break;
109                         }
110                         m_generator.add_vertex(*x, *y, cmd);
111                         m_markers.add_vertex(*x, *y, path_cmd_line_to);
112                     } else {
113                         if(is_stop(cmd)) {
114                             m_last_cmd = path_cmd_stop;
115                             break;
116                         }
117                         if(is_end_poly(cmd)) {
118                             m_generator.add_vertex(*x, *y, cmd);
119                             break;
120                         }
121                     }
122                 }
123                 m_generator.rewind(0);
124                 m_status = generate;
125             case generate:
126                 cmd = m_generator.vertex(x, y);
127                 if(is_stop(cmd)) {
128                     m_status = accumulate;
129                     break;
130                 }
131                 done = true;
132                 break;
133         }
134     }
135     return cmd;
136 }
137 }
138 #endif