666 lines
22 KiB
C++
666 lines
22 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.3
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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//
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// The author gratefully acknowleges the support of David Turner,
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// Robert Wilhelm, and Werner Lemberg - the authors of the FreeType
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// libray - in producing this work. See http://www.freetype.org for details.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// Adaptation for 32-bit screen coordinates has been sponsored by
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// Liberty Technology Systems, Inc., visit http://lib-sys.com
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//
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// Liberty Technology Systems, Inc. is the provider of
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// PostScript and PDF technology for software developers.
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_RASTERIZER_COMPOUND_AA_INCLUDED
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#define AGG_RASTERIZER_COMPOUND_AA_INCLUDED
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#include <limits>
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#include "agg_rasterizer_cells_aa.h"
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#include "agg_rasterizer_sl_clip.h"
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namespace agg
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{
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//-----------------------------------------------------------cell_style_aa
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// A pixel cell. There're no constructors defined and it was done
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// intentionally in order to avoid extra overhead when allocating an
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// array of cells.
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struct cell_style_aa
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{
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int x;
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int y;
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int cover;
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int area;
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int16 left, right;
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void initial()
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{
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x = std::numeric_limits<int>::max();
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y = std::numeric_limits<int>::max();
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cover = 0;
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area = 0;
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left = -1;
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right = -1;
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}
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void style(const cell_style_aa& c)
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{
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left = c.left;
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right = c.right;
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}
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int not_equal(int ex, int ey, const cell_style_aa& c) const
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{
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return ((unsigned)ex - (unsigned)x) | ((unsigned)ey - (unsigned)y) |
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((unsigned)left - (unsigned)c.left) | ((unsigned)right - (unsigned)c.right);
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}
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};
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//===========================================================layer_order_e
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enum layer_order_e
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{
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layer_unsorted, //------layer_unsorted
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layer_direct, //------layer_direct
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layer_inverse //------layer_inverse
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};
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//==================================================rasterizer_compound_aa
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template<class Clip=rasterizer_sl_clip_int> class rasterizer_compound_aa
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{
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struct style_info
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{
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unsigned start_cell;
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unsigned num_cells;
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int last_x;
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};
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struct cell_info
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{
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int x, area, cover;
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};
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public:
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typedef Clip clip_type;
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typedef typename Clip::conv_type conv_type;
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typedef typename Clip::coord_type coord_type;
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enum aa_scale_e
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{
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aa_shift = 8,
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aa_scale = 1 << aa_shift,
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aa_mask = aa_scale - 1,
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aa_scale2 = aa_scale * 2,
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aa_mask2 = aa_scale2 - 1
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};
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//--------------------------------------------------------------------
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rasterizer_compound_aa() :
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m_outline(),
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m_clipper(),
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m_filling_rule(fill_non_zero),
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m_layer_order(layer_direct),
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m_styles(), // Active Styles
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m_ast(), // Active Style Table (unique values)
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m_asm(), // Active Style Mask
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m_cells(),
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m_cover_buf(),
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m_min_style(std::numeric_limits<int>::max()),
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m_max_style(std::numeric_limits<int>::min()),
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m_start_x(0),
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m_start_y(0),
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m_scan_y(std::numeric_limits<int>::max()),
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m_sl_start(0),
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m_sl_len(0)
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{}
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//--------------------------------------------------------------------
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void reset();
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void reset_clipping();
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void clip_box(double x1, double y1, double x2, double y2);
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void filling_rule(filling_rule_e filling_rule);
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void layer_order(layer_order_e order);
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//--------------------------------------------------------------------
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void styles(int left, int right);
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void move_to(int x, int y);
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void line_to(int x, int y);
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void move_to_d(double x, double y);
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void line_to_d(double x, double y);
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void add_vertex(double x, double y, unsigned cmd);
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void edge(int x1, int y1, int x2, int y2);
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void edge_d(double x1, double y1, double x2, double y2);
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//-------------------------------------------------------------------
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template<class VertexSource>
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void add_path(VertexSource& vs, unsigned path_id=0)
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{
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double x;
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double y;
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unsigned cmd;
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vs.rewind(path_id);
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if(m_outline.sorted()) reset();
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while(!is_stop(cmd = vs.vertex(&x, &y)))
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{
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add_vertex(x, y, cmd);
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}
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}
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//--------------------------------------------------------------------
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int min_x() const { return m_outline.min_x(); }
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int min_y() const { return m_outline.min_y(); }
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int max_x() const { return m_outline.max_x(); }
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int max_y() const { return m_outline.max_y(); }
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int min_style() const { return m_min_style; }
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int max_style() const { return m_max_style; }
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//--------------------------------------------------------------------
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void sort();
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bool rewind_scanlines();
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unsigned sweep_styles();
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int scanline_start() const { return m_sl_start; }
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unsigned scanline_length() const { return m_sl_len; }
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unsigned style(unsigned style_idx) const;
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cover_type* allocate_cover_buffer(unsigned len);
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//--------------------------------------------------------------------
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bool navigate_scanline(int y);
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bool hit_test(int tx, int ty);
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//--------------------------------------------------------------------
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AGG_INLINE unsigned calculate_alpha(int area) const
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{
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int cover = area >> (poly_subpixel_shift*2 + 1 - aa_shift);
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if(cover < 0) cover = -cover;
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if(m_filling_rule == fill_even_odd)
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{
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cover &= aa_mask2;
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if(cover > aa_scale)
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{
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cover = aa_scale2 - cover;
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}
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}
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if(cover > aa_mask) cover = aa_mask;
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return cover;
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}
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//--------------------------------------------------------------------
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// Sweeps one scanline with one style index. The style ID can be
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// determined by calling style().
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template<class Scanline> bool sweep_scanline(Scanline& sl, int style_idx)
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{
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int scan_y = m_scan_y - 1;
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if(scan_y > m_outline.max_y()) return false;
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sl.reset_spans();
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if(style_idx < 0)
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{
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style_idx = 0;
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}
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else
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{
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style_idx++;
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}
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const style_info& st = m_styles[m_ast[style_idx]];
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unsigned num_cells = st.num_cells;
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cell_info* cell = &m_cells[st.start_cell];
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int cover = 0;
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while(num_cells--)
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{
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unsigned alpha;
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int x = cell->x;
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int area = cell->area;
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cover += cell->cover;
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++cell;
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if(area)
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{
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alpha = calculate_alpha((cover << (poly_subpixel_shift + 1)) - area);
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sl.add_cell(x, alpha);
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x++;
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}
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if(num_cells && cell->x > x)
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{
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alpha = calculate_alpha(cover << (poly_subpixel_shift + 1));
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if(alpha)
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{
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sl.add_span(x, cell->x - x, alpha);
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}
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}
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}
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if(sl.num_spans() == 0) return false;
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sl.finalize(scan_y);
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return true;
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}
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private:
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void add_style(int style_id);
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//--------------------------------------------------------------------
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// Disable copying
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rasterizer_compound_aa(const rasterizer_compound_aa<Clip>&);
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const rasterizer_compound_aa<Clip>&
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operator = (const rasterizer_compound_aa<Clip>&);
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private:
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rasterizer_cells_aa<cell_style_aa> m_outline;
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clip_type m_clipper;
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filling_rule_e m_filling_rule;
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layer_order_e m_layer_order;
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pod_vector<style_info> m_styles; // Active Styles
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pod_vector<unsigned> m_ast; // Active Style Table (unique values)
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pod_vector<int8u> m_asm; // Active Style Mask
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pod_vector<cell_info> m_cells;
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pod_vector<cover_type> m_cover_buf;
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int m_min_style;
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int m_max_style;
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coord_type m_start_x;
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coord_type m_start_y;
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int m_scan_y;
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int m_sl_start;
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unsigned m_sl_len;
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};
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::reset()
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{
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m_outline.reset();
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m_min_style = std::numeric_limits<int>::max();
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m_max_style = std::numeric_limits<int>::min();
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m_scan_y = std::numeric_limits<int>::max();
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m_sl_start = 0;
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m_sl_len = 0;
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::filling_rule(filling_rule_e filling_rule)
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{
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m_filling_rule = filling_rule;
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::layer_order(layer_order_e order)
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{
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m_layer_order = order;
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::clip_box(double x1, double y1,
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double x2, double y2)
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{
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reset();
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m_clipper.clip_box(conv_type::upscale(x1), conv_type::upscale(y1),
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conv_type::upscale(x2), conv_type::upscale(y2));
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::reset_clipping()
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{
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reset();
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m_clipper.reset_clipping();
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::styles(int left, int right)
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{
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cell_style_aa cell;
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cell.initial();
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cell.left = (int16)left;
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cell.right = (int16)right;
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m_outline.style(cell);
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if(left >= 0 && left < m_min_style) m_min_style = left;
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if(left >= 0 && left > m_max_style) m_max_style = left;
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if(right >= 0 && right < m_min_style) m_min_style = right;
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if(right >= 0 && right > m_max_style) m_max_style = right;
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::move_to(int x, int y)
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{
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if(m_outline.sorted()) reset();
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m_clipper.move_to(m_start_x = conv_type::downscale(x),
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m_start_y = conv_type::downscale(y));
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::line_to(int x, int y)
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{
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m_clipper.line_to(m_outline,
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conv_type::downscale(x),
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conv_type::downscale(y));
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::move_to_d(double x, double y)
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{
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if(m_outline.sorted()) reset();
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m_clipper.move_to(m_start_x = conv_type::upscale(x),
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m_start_y = conv_type::upscale(y));
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::line_to_d(double x, double y)
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{
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m_clipper.line_to(m_outline,
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conv_type::upscale(x),
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conv_type::upscale(y));
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::add_vertex(double x, double y, unsigned cmd)
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{
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if(is_move_to(cmd))
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{
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move_to_d(x, y);
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}
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else
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if(is_vertex(cmd))
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{
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line_to_d(x, y);
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}
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else
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if(is_close(cmd))
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{
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m_clipper.line_to(m_outline, m_start_x, m_start_y);
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}
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::edge(int x1, int y1, int x2, int y2)
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{
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if(m_outline.sorted()) reset();
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m_clipper.move_to(conv_type::downscale(x1), conv_type::downscale(y1));
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m_clipper.line_to(m_outline,
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conv_type::downscale(x2),
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conv_type::downscale(y2));
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}
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//------------------------------------------------------------------------
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template<class Clip>
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void rasterizer_compound_aa<Clip>::edge_d(double x1, double y1,
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double x2, double y2)
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{
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if(m_outline.sorted()) reset();
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m_clipper.move_to(conv_type::upscale(x1), conv_type::upscale(y1));
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m_clipper.line_to(m_outline,
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conv_type::upscale(x2),
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conv_type::upscale(y2));
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}
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//------------------------------------------------------------------------
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template<class Clip>
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AGG_INLINE void rasterizer_compound_aa<Clip>::sort()
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{
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m_outline.sort_cells();
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}
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//------------------------------------------------------------------------
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template<class Clip>
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AGG_INLINE bool rasterizer_compound_aa<Clip>::rewind_scanlines()
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{
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m_outline.sort_cells();
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if(m_outline.total_cells() == 0)
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{
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return false;
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}
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if(m_max_style < m_min_style)
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{
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return false;
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}
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m_scan_y = m_outline.min_y();
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m_styles.allocate(m_max_style - m_min_style + 2, 128);
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return true;
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}
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//------------------------------------------------------------------------
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template<class Clip>
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AGG_INLINE void rasterizer_compound_aa<Clip>::add_style(int style_id)
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{
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if(style_id < 0) style_id = 0;
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else style_id -= m_min_style - 1;
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unsigned nbyte = style_id >> 3;
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unsigned mask = 1 << (style_id & 7);
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style_info* style = &m_styles[style_id];
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if((m_asm[nbyte] & mask) == 0)
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{
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m_ast.add(style_id);
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m_asm[nbyte] |= mask;
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style->start_cell = 0;
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style->num_cells = 0;
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style->last_x = std::numeric_limits<int>::min();
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}
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++style->start_cell;
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}
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//------------------------------------------------------------------------
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// Returns the number of styles
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template<class Clip>
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unsigned rasterizer_compound_aa<Clip>::sweep_styles()
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{
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for(;;)
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{
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if(m_scan_y > m_outline.max_y()) return 0;
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unsigned num_cells = m_outline.scanline_num_cells(m_scan_y);
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const cell_style_aa* const* cells = m_outline.scanline_cells(m_scan_y);
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unsigned num_styles = m_max_style - m_min_style + 2;
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const cell_style_aa* curr_cell;
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unsigned style_id;
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style_info* style;
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cell_info* cell;
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m_cells.allocate(num_cells * 2, 256); // Each cell can have two styles
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m_ast.capacity(num_styles, 64);
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m_asm.allocate((num_styles + 7) >> 3, 8);
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m_asm.zero();
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if(num_cells)
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{
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// Pre-add zero (for no-fill style, that is, -1).
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// We need that to ensure that the "-1 style" would go first.
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m_asm[0] |= 1;
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m_ast.add(0);
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style = &m_styles[0];
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style->start_cell = 0;
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style->num_cells = 0;
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style->last_x = std::numeric_limits<int>::min();
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m_sl_start = cells[0]->x;
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m_sl_len = cells[num_cells-1]->x - m_sl_start + 1;
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while(num_cells--)
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{
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curr_cell = *cells++;
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add_style(curr_cell->left);
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add_style(curr_cell->right);
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}
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// Convert the Y-histogram into the array of starting indexes
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unsigned i;
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unsigned start_cell = 0;
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for(i = 0; i < m_ast.size(); i++)
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{
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style_info& st = m_styles[m_ast[i]];
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unsigned v = st.start_cell;
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st.start_cell = start_cell;
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start_cell += v;
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}
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cells = m_outline.scanline_cells(m_scan_y);
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num_cells = m_outline.scanline_num_cells(m_scan_y);
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while(num_cells--)
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|
{
|
|
curr_cell = *cells++;
|
|
style_id = (curr_cell->left < 0) ? 0 :
|
|
curr_cell->left - m_min_style + 1;
|
|
|
|
style = &m_styles[style_id];
|
|
if(curr_cell->x == style->last_x)
|
|
{
|
|
cell = &m_cells[style->start_cell + style->num_cells - 1];
|
|
cell->area += curr_cell->area;
|
|
cell->cover += curr_cell->cover;
|
|
}
|
|
else
|
|
{
|
|
cell = &m_cells[style->start_cell + style->num_cells];
|
|
cell->x = curr_cell->x;
|
|
cell->area = curr_cell->area;
|
|
cell->cover = curr_cell->cover;
|
|
style->last_x = curr_cell->x;
|
|
style->num_cells++;
|
|
}
|
|
|
|
style_id = (curr_cell->right < 0) ? 0 :
|
|
curr_cell->right - m_min_style + 1;
|
|
|
|
style = &m_styles[style_id];
|
|
if(curr_cell->x == style->last_x)
|
|
{
|
|
cell = &m_cells[style->start_cell + style->num_cells - 1];
|
|
cell->area -= curr_cell->area;
|
|
cell->cover -= curr_cell->cover;
|
|
}
|
|
else
|
|
{
|
|
cell = &m_cells[style->start_cell + style->num_cells];
|
|
cell->x = curr_cell->x;
|
|
cell->area = -curr_cell->area;
|
|
cell->cover = -curr_cell->cover;
|
|
style->last_x = curr_cell->x;
|
|
style->num_cells++;
|
|
}
|
|
}
|
|
}
|
|
if(m_ast.size() > 1) break;
|
|
++m_scan_y;
|
|
}
|
|
++m_scan_y;
|
|
|
|
if(m_layer_order != layer_unsorted)
|
|
{
|
|
range_adaptor<pod_vector<unsigned> > ra(m_ast, 1, m_ast.size() - 1);
|
|
if(m_layer_order == layer_direct) quick_sort(ra, unsigned_greater);
|
|
else quick_sort(ra, unsigned_less);
|
|
}
|
|
|
|
return m_ast.size() - 1;
|
|
}
|
|
|
|
//------------------------------------------------------------------------
|
|
// Returns style ID depending of the existing style index
|
|
template<class Clip>
|
|
AGG_INLINE
|
|
unsigned rasterizer_compound_aa<Clip>::style(unsigned style_idx) const
|
|
{
|
|
return m_ast[style_idx + 1] + m_min_style - 1;
|
|
}
|
|
|
|
//------------------------------------------------------------------------
|
|
template<class Clip>
|
|
AGG_INLINE bool rasterizer_compound_aa<Clip>::navigate_scanline(int y)
|
|
{
|
|
m_outline.sort_cells();
|
|
if(m_outline.total_cells() == 0)
|
|
{
|
|
return false;
|
|
}
|
|
if(m_max_style < m_min_style)
|
|
{
|
|
return false;
|
|
}
|
|
if(y < m_outline.min_y() || y > m_outline.max_y())
|
|
{
|
|
return false;
|
|
}
|
|
m_scan_y = y;
|
|
m_styles.allocate(m_max_style - m_min_style + 2, 128);
|
|
return true;
|
|
}
|
|
|
|
//------------------------------------------------------------------------
|
|
template<class Clip>
|
|
bool rasterizer_compound_aa<Clip>::hit_test(int tx, int ty)
|
|
{
|
|
if(!navigate_scanline(ty))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
unsigned num_styles = sweep_styles();
|
|
if(num_styles <= 0)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
scanline_hit_test sl(tx);
|
|
sweep_scanline(sl, -1);
|
|
return sl.hit();
|
|
}
|
|
|
|
//------------------------------------------------------------------------
|
|
template<class Clip>
|
|
cover_type* rasterizer_compound_aa<Clip>::allocate_cover_buffer(unsigned len)
|
|
{
|
|
m_cover_buf.allocate(len, 256);
|
|
return &m_cover_buf[0];
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
|
|