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Diffstat (limited to 'third_party/agg23/agg_conv_adaptor_vcgen.h')
| -rw-r--r-- | third_party/agg23/agg_conv_adaptor_vcgen.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/third_party/agg23/agg_conv_adaptor_vcgen.h b/third_party/agg23/agg_conv_adaptor_vcgen.h new file mode 100644 index 0000000000..0d8d6ff99e --- /dev/null +++ b/third_party/agg23/agg_conv_adaptor_vcgen.h @@ -0,0 +1,138 @@ + +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +#ifndef AGG_CONV_ADAPTOR_VCGEN_INCLUDED +#define AGG_CONV_ADAPTOR_VCGEN_INCLUDED +#include "agg_basics.h" +namespace agg +{ +struct null_markers { + void remove_all() {} + void add_vertex(FX_FLOAT, FX_FLOAT, unsigned) {} + void prepare_src() {} + void rewind(unsigned) {} + unsigned vertex(FX_FLOAT*, FX_FLOAT*) + { + return path_cmd_stop; + } +}; +template<class VertexSource, + class Generator, + class Markers = null_markers> class conv_adaptor_vcgen +{ + enum status { + initial, + accumulate, + generate + }; +public: + conv_adaptor_vcgen(VertexSource& source) : + m_source(&source), + m_status(initial) + {} + void set_source(VertexSource& source) + { + m_source = &source; + } + Generator& generator() + { + return m_generator; + } + const Generator& generator() const + { + return m_generator; + } + Markers& markers() + { + return m_markers; + } + const Markers& markers() const + { + return m_markers; + } + void rewind(unsigned path_id) + { + m_source->rewind(path_id); + m_status = initial; + } + unsigned vertex(FX_FLOAT* x, FX_FLOAT* y); +private: + conv_adaptor_vcgen(const conv_adaptor_vcgen<VertexSource, Generator, Markers>&); + const conv_adaptor_vcgen<VertexSource, Generator, Markers>& + operator = (const conv_adaptor_vcgen<VertexSource, Generator, Markers>&); + VertexSource* m_source; + Generator m_generator; + Markers m_markers; + status m_status; + unsigned m_last_cmd; + FX_FLOAT m_start_x; + FX_FLOAT m_start_y; +}; +template<class VertexSource, class Generator, class Markers> +unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(FX_FLOAT* x, FX_FLOAT* y) +{ + unsigned cmd = path_cmd_stop; + bool done = false; + while(!done) { + switch(m_status) { + case initial: + m_markers.remove_all(); + m_last_cmd = m_source->vertex(&m_start_x, &m_start_y); + m_status = accumulate; + case accumulate: + if(is_stop(m_last_cmd)) { + return path_cmd_stop; + } + m_generator.remove_all(); + m_generator.add_vertex(m_start_x, m_start_y, path_cmd_move_to); + m_markers.add_vertex(m_start_x, m_start_y, path_cmd_move_to); + for(;;) { + cmd = m_source->vertex(x, y); + if(is_vertex(cmd)) { + m_last_cmd = cmd; + if(is_move_to(cmd)) { + m_start_x = *x; + m_start_y = *y; + break; + } + m_generator.add_vertex(*x, *y, cmd); + m_markers.add_vertex(*x, *y, path_cmd_line_to); + } else { + if(is_stop(cmd)) { + m_last_cmd = path_cmd_stop; + break; + } + if(is_end_poly(cmd)) { + m_generator.add_vertex(*x, *y, cmd); + break; + } + } + } + m_generator.rewind(0); + m_status = generate; + case generate: + cmd = m_generator.vertex(x, y); + if(is_stop(cmd)) { + m_status = accumulate; + break; + } + done = true; + break; + } + } + return cmd; +} +} +#endif |