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Diffstat (limited to 'agg/inc/agg_scanline_bin.h')
| -rwxr-xr-x | agg/inc/agg_scanline_bin.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/agg/inc/agg_scanline_bin.h b/agg/inc/agg_scanline_bin.h new file mode 100755 index 000000000000..aa60ed061e07 --- /dev/null +++ b/agg/inc/agg_scanline_bin.h @@ -0,0 +1,171 @@ +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +// +// Class scanline_bin - binary scanline. +// +//---------------------------------------------------------------------------- +#ifndef AGG_SCANLINE_BIN_INCLUDED +#define AGG_SCANLINE_BIN_INCLUDED + +#include "agg_basics.h" + +namespace agg +{ + + //=============================================================scanline_bin + // + // This is binary scaline container which supports the interface + // used in the rasterizer::render(). See description of agg_scanline_u8 + // for details. + // + // Rendering: + //------------------------------------------------------------------------- + // + // int y = sl.y(); + // + // ************************************ + // ...Perform vertical clipping here... + // ************************************ + // + // unsigned num_spans = sl.num_spans(); + // const agg::scanline_bin::span* cur_span = sl.spans(); + // + // do + // { + // x = cur_span->x; + // len = cur_span->len; + // + // ************************************** + // ...Perform horizontal clipping here... + // ************************************** + // + // hor_line(x, y, len) + // ++cur_span; + // } + // while(--num_spans); + // + //------------------------------------------------------------------------ + class scanline_bin + { + public: + struct span + { + int16 x; + int16 len; + }; + + typedef const span* const_iterator; + + ~scanline_bin() + { + delete [] m_spans; + } + + scanline_bin() : + m_max_len(0), + m_last_x(0x7FFF), + m_spans(0), + m_cur_span(0) + { + } + + void reset(int min_x, int max_x); + void add_cell(int x, unsigned); + void add_cells(int x, unsigned len, const void*); + void add_span(int x, unsigned len, unsigned); + void finalize(int y) { m_y = y; } + void reset_spans(); + + int y() const { return m_y; } + unsigned num_spans() const { return unsigned(m_cur_span - m_spans); } + const_iterator begin() const { return m_spans + 1; } + + private: + scanline_bin(const scanline_bin&); + const scanline_bin operator = (const scanline_bin&); + + unsigned m_max_len; + int m_last_x; + int m_y; + span* m_spans; + span* m_cur_span; + }; + + + //------------------------------------------------------------------------ + inline void scanline_bin::reset(int min_x, int max_x) + { + unsigned max_len = max_x - min_x + 3; + if(max_len > m_max_len) + { + delete [] m_spans; + m_spans = new span [max_len]; + m_max_len = max_len; + } + m_last_x = 0x7FFF; + m_cur_span = m_spans; + } + + + //------------------------------------------------------------------------ + inline void scanline_bin::reset_spans() + { + m_last_x = 0x7FFF; + m_cur_span = m_spans; + } + + + //------------------------------------------------------------------------ + inline void scanline_bin::add_cell(int x, unsigned) + { + if(x == m_last_x+1) + { + m_cur_span->len++; + } + else + { + ++m_cur_span; + m_cur_span->x = (int16)x; + m_cur_span->len = 1; + } + m_last_x = x; + } + + + //------------------------------------------------------------------------ + inline void scanline_bin::add_span(int x, unsigned len, unsigned) + { + if(x == m_last_x+1) + { + m_cur_span->len = (int16)(m_cur_span->len + len); + } + else + { + ++m_cur_span; + m_cur_span->x = (int16)x; + m_cur_span->len = (int16)len; + } + m_last_x = x + len - 1; + } + + //------------------------------------------------------------------------ + inline void scanline_bin::add_cells(int x, unsigned len, const void*) + { + add_span(x, len, 0); + } +} + + +#endif |