//---------------------------------------------------------------------------- // 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. // //---------------------------------------------------------------------------- // // The author gratefully acknowleges the support of David Turner, // Robert Wilhelm, and Werner Lemberg - the authors of the FreeType // libray - in producing this work. See http://www.freetype.org for details. // //---------------------------------------------------------------------------- // Contact: mcseem@antigrain.com // mcseemagg@yahoo.com // http://www.antigrain.com //---------------------------------------------------------------------------- // // Adaptation for 32-bit screen coordinates has been sponsored by // Liberty Technology Systems, Inc., visit http://lib-sys.com // // Liberty Technology Systems, Inc. is the provider of // PostScript and PDF technology for software developers. // //---------------------------------------------------------------------------- #ifndef AGG_RASTERIZER_COMPOUND_AA_INCLUDED #define AGG_RASTERIZER_COMPOUND_AA_INCLUDED #include "agg_rasterizer_cells_aa.h" #include "agg_rasterizer_sl_clip.h" namespace agg { //-----------------------------------------------------------cell_style_aa // A pixel cell. There're no constructors defined and it was done // intentionally in order to avoid extra overhead when allocating an // array of cells. struct cell_style_aa { int x; int y; int cover; int area; int16 left, right; void initial() { x = 0x7FFFFFFF; y = 0x7FFFFFFF; cover = 0; area = 0; left = -1; right = -1; } void style(const cell_style_aa& c) { left = c.left; right = c.right; } int not_equal(int ex, int ey, const cell_style_aa& c) const { return (ex - x) | (ey - y) | (left - c.left) | (right - c.right); } }; //===========================================================layer_order_e enum layer_order_e { layer_unsorted, //------layer_unsorted layer_direct, //------layer_direct layer_inverse //------layer_inverse }; //==================================================rasterizer_compound_aa template<class Clip=rasterizer_sl_clip_int> class rasterizer_compound_aa { struct style_info { unsigned start_cell; unsigned num_cells; int last_x; }; struct cell_info { int x, area, cover; }; public: typedef Clip clip_type; typedef typename Clip::conv_type conv_type; typedef typename Clip::coord_type coord_type; enum aa_scale_e { aa_shift = 8, aa_scale = 1 << aa_shift, aa_mask = aa_scale - 1, aa_scale2 = aa_scale * 2, aa_mask2 = aa_scale2 - 1 }; //-------------------------------------------------------------------- rasterizer_compound_aa() : m_outline(), m_clipper(), m_filling_rule(fill_non_zero), m_layer_order(layer_direct), m_styles(), // Active Styles m_ast(), // Active Style Table (unique values) m_asm(), // Active Style Mask m_cells(), m_cover_buf(), m_master_alpha(), m_min_style(0x7FFFFFFF), m_max_style(-0x7FFFFFFF), m_start_x(0), m_start_y(0), m_scan_y(0x7FFFFFFF), m_sl_start(0), m_sl_len(0) {} //-------------------------------------------------------------------- void reset(); void reset_clipping(); void clip_box(double x1, double y1, double x2, double y2); void filling_rule(filling_rule_e filling_rule); void layer_order(layer_order_e order); void master_alpha(int style, double alpha); //-------------------------------------------------------------------- void styles(int left, int right); void move_to(int x, int y); void line_to(int x, int y); void move_to_d(double x, double y); void line_to_d(double x, double y); void add_vertex(double x, double y, unsigned cmd); void edge(int x1, int y1, int x2, int y2); void edge_d(double x1, double y1, double x2, double y2); //------------------------------------------------------------------- template<class VertexSource> void add_path(VertexSource& vs, unsigned path_id=0) { double x; double y; unsigned cmd; vs.rewind(path_id); if(m_outline.sorted()) reset(); while(!is_stop(cmd = vs.vertex(&x, &y))) { add_vertex(x, y, cmd); } } //-------------------------------------------------------------------- int min_x() const { return m_outline.min_x(); } int min_y() const { return m_outline.min_y(); } int max_x() const { return m_outline.max_x(); } int max_y() const { return m_outline.max_y(); } int min_style() const { return m_min_style; } int max_style() const { return m_max_style; } //-------------------------------------------------------------------- void sort(); bool rewind_scanlines(); unsigned sweep_styles(); int scanline_start() const { return m_sl_start; } unsigned scanline_length() const { return m_sl_len; } unsigned style(unsigned style_idx) const; cover_type* allocate_cover_buffer(unsigned len); //-------------------------------------------------------------------- bool navigate_scanline(int y); bool hit_test(int tx, int ty); //-------------------------------------------------------------------- AGG_INLINE unsigned calculate_alpha(int area, unsigned master_alpha) const { int cover = area >> (poly_subpixel_shift*2 + 1 - aa_shift); if(cover < 0) cover = -cover; if(m_filling_rule == fill_even_odd) { cover &= aa_mask2; if(cover > aa_scale) { cover = aa_scale2 - cover; } } if(cover > aa_mask) cover = aa_mask; return (cover * master_alpha + aa_mask) >> aa_shift; } //-------------------------------------------------------------------- // Sweeps one scanline with one style index. The style ID can be // determined by calling style(). template<class Scanline> bool sweep_scanline(Scanline& sl, int style_idx) { int scan_y = m_scan_y - 1; if(scan_y > m_outline.max_y()) return false; sl.reset_spans(); unsigned master_alpha = aa_mask; if(style_idx < 0) { style_idx = 0; } else { style_idx++; master_alpha = m_master_alpha[m_ast[style_idx] + m_min_style - 1]; } const style_info& st = m_styles[m_ast[style_idx]]; unsigned num_cells = st.num_cells; cell_info* cell = &m_cells[st.start_cell]; int cover = 0; while(num_cells--) { unsigned alpha; int x = cell->x; int area = cell->area; cover += cell->cover; ++cell; if(area) { alpha = calculate_alpha((cover << (poly_subpixel_shift + 1)) - area, master_alpha); sl.add_cell(x, alpha); x++; } if(num_cells && cell->x > x) { alpha = calculate_alpha(cover << (poly_subpixel_shift + 1), master_alpha); if(alpha) { sl.add_span(x, cell->x - x, alpha); } } } if(sl.num_spans() == 0) return false; sl.finalize(scan_y); return true; } private: void add_style(int style_id); void allocate_master_alpha(); //-------------------------------------------------------------------- // Disable copying rasterizer_compound_aa(const rasterizer_compound_aa<Clip>&); const rasterizer_compound_aa<Clip>& operator = (const rasterizer_compound_aa<Clip>&); private: rasterizer_cells_aa<cell_style_aa> m_outline; clip_type m_clipper; filling_rule_e m_filling_rule; layer_order_e m_layer_order; pod_vector<style_info> m_styles; // Active Styles pod_vector<unsigned> m_ast; // Active Style Table (unique values) pod_vector<int8u> m_asm; // Active Style Mask pod_vector<cell_info> m_cells; pod_vector<cover_type> m_cover_buf; pod_bvector<unsigned> m_master_alpha; int m_min_style; int m_max_style; coord_type m_start_x; coord_type m_start_y; int m_scan_y; int m_sl_start; unsigned m_sl_len; }; //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::reset() { m_outline.reset(); m_min_style = 0x7FFFFFFF; m_max_style = -0x7FFFFFFF; m_scan_y = 0x7FFFFFFF; m_sl_start = 0; m_sl_len = 0; } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::filling_rule(filling_rule_e filling_rule) { m_filling_rule = filling_rule; } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::layer_order(layer_order_e order) { m_layer_order = order; } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::clip_box(double x1, double y1, double x2, double y2) { reset(); m_clipper.clip_box(conv_type::upscale(x1), conv_type::upscale(y1), conv_type::upscale(x2), conv_type::upscale(y2)); } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::reset_clipping() { reset(); m_clipper.reset_clipping(); } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::styles(int left, int right) { cell_style_aa cell; cell.initial(); cell.left = (int16)left; cell.right = (int16)right; m_outline.style(cell); if(left >= 0 && left < m_min_style) m_min_style = left; if(left >= 0 && left > m_max_style) m_max_style = left; if(right >= 0 && right < m_min_style) m_min_style = right; if(right >= 0 && right > m_max_style) m_max_style = right; } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::move_to(int x, int y) { if(m_outline.sorted()) reset(); m_clipper.move_to(m_start_x = conv_type::downscale(x), m_start_y = conv_type::downscale(y)); } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::line_to(int x, int y) { m_clipper.line_to(m_outline, conv_type::downscale(x), conv_type::downscale(y)); } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::move_to_d(double x, double y) { if(m_outline.sorted()) reset(); m_clipper.move_to(m_start_x = conv_type::upscale(x), m_start_y = conv_type::upscale(y)); } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::line_to_d(double x, double y) { m_clipper.line_to(m_outline, conv_type::upscale(x), conv_type::upscale(y)); } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::add_vertex(double x, double y, unsigned cmd) { if(is_move_to(cmd)) { move_to_d(x, y); } else if(is_vertex(cmd)) { line_to_d(x, y); } else if(is_close(cmd)) { m_clipper.line_to(m_outline, m_start_x, m_start_y); } } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::edge(int x1, int y1, int x2, int y2) { if(m_outline.sorted()) reset(); m_clipper.move_to(conv_type::downscale(x1), conv_type::downscale(y1)); m_clipper.line_to(m_outline, conv_type::downscale(x2), conv_type::downscale(y2)); } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::edge_d(double x1, double y1, double x2, double y2) { if(m_outline.sorted()) reset(); m_clipper.move_to(conv_type::upscale(x1), conv_type::upscale(y1)); m_clipper.line_to(m_outline, conv_type::upscale(x2), conv_type::upscale(y2)); } //------------------------------------------------------------------------ template<class Clip> AGG_INLINE void rasterizer_compound_aa<Clip>::sort() { m_outline.sort_cells(); } //------------------------------------------------------------------------ template<class Clip> AGG_INLINE bool rasterizer_compound_aa<Clip>::rewind_scanlines() { m_outline.sort_cells(); if(m_outline.total_cells() == 0) { return false; } if(m_max_style < m_min_style) { return false; } m_scan_y = m_outline.min_y(); m_styles.allocate(m_max_style - m_min_style + 2, 128); allocate_master_alpha(); return true; } //------------------------------------------------------------------------ template<class Clip> AGG_INLINE void rasterizer_compound_aa<Clip>::add_style(int style_id) { if(style_id < 0) style_id = 0; else style_id -= m_min_style - 1; unsigned nbyte = style_id >> 3; unsigned mask = 1 << (style_id & 7); style_info* style = &m_styles[style_id]; if((m_asm[nbyte] & mask) == 0) { m_ast.add(style_id); m_asm[nbyte] |= mask; style->start_cell = 0; style->num_cells = 0; style->last_x = -0x7FFFFFFF; } ++style->start_cell; } //------------------------------------------------------------------------ // Returns the number of styles template<class Clip> unsigned rasterizer_compound_aa<Clip>::sweep_styles() { for(;;) { if(m_scan_y > m_outline.max_y()) return 0; unsigned num_cells = m_outline.scanline_num_cells(m_scan_y); const cell_style_aa* const* cells = m_outline.scanline_cells(m_scan_y); unsigned num_styles = m_max_style - m_min_style + 2; const cell_style_aa* curr_cell; unsigned style_id; style_info* style; cell_info* cell; m_cells.allocate(num_cells * 2, 256); // Each cell can have two styles m_ast.capacity(num_styles, 64); m_asm.allocate((num_styles + 7) >> 3, 8); m_asm.zero(); if(num_cells) { // Pre-add zero (for no-fill style, that is, -1). // We need that to ensure that the "-1 style" would go first. m_asm[0] |= 1; m_ast.add(0); style = &m_styles[0]; style->start_cell = 0; style->num_cells = 0; style->last_x = -0x7FFFFFFF; m_sl_start = cells[0]->x; m_sl_len = cells[num_cells-1]->x - m_sl_start + 1; while(num_cells--) { curr_cell = *cells++; add_style(curr_cell->left); add_style(curr_cell->right); } // Convert the Y-histogram into the array of starting indexes unsigned i; unsigned start_cell = 0; for(i = 0; i < m_ast.size(); i++) { style_info& st = m_styles[m_ast[i]]; unsigned v = st.start_cell; st.start_cell = start_cell; start_cell += v; } cells = m_outline.scanline_cells(m_scan_y); num_cells = m_outline.scanline_num_cells(m_scan_y); while(num_cells--) { 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); allocate_master_alpha(); 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]; } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::allocate_master_alpha() { while((int)m_master_alpha.size() <= m_max_style) { m_master_alpha.add(aa_mask); } } //------------------------------------------------------------------------ template<class Clip> void rasterizer_compound_aa<Clip>::master_alpha(int style, double alpha) { if(style >= 0) { while((int)m_master_alpha.size() <= style) { m_master_alpha.add(aa_mask); } m_master_alpha[style] = uround(alpha * aa_mask); } } } #endif