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Diffstat (limited to 'third_party/agg23/agg_rasterizer_scanline_aa.h')
| -rw-r--r-- | third_party/agg23/agg_rasterizer_scanline_aa.h | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/third_party/agg23/agg_rasterizer_scanline_aa.h b/third_party/agg23/agg_rasterizer_scanline_aa.h new file mode 100644 index 0000000000..da1900d0dd --- /dev/null +++ b/third_party/agg23/agg_rasterizer_scanline_aa.h @@ -0,0 +1,472 @@ + +//---------------------------------------------------------------------------- +// 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_SCANLINE_AA_INCLUDED +#define AGG_RASTERIZER_SCANLINE_AA_INCLUDED +#include "../../core/include/fxge/fx_ge.h" +#include "agg_basics.h" +#include "agg_math.h" +#include "agg_array.h" +#include "agg_clip_liang_barsky.h" +#include "agg_render_scanlines.h" +namespace agg +{ +enum poly_base_scale_e { + poly_base_shift = 8, + poly_base_size = 1 << poly_base_shift, + poly_base_mask = poly_base_size - 1 +}; +inline int poly_coord(FX_FLOAT c) +{ + return int(c * poly_base_size); +} +struct cell_aa { + int x; + int y; + int cover; + int area; + void set(int x, int y, int c, int a); + void set_coord(int x, int y); + void set_cover(int c, int a); + void add_cover(int c, int a); +}; +class outline_aa +{ + enum cell_block_scale_e { + cell_block_shift = 12, + cell_block_size = 1 << cell_block_shift, + cell_block_mask = cell_block_size - 1, + cell_block_pool = 256, + cell_block_limit = 1024 + }; + struct sorted_y { + unsigned start; + unsigned num; + }; +public: + ~outline_aa(); + outline_aa(); + void reset(); + void move_to(int x, int y); + void line_to(int x, int y); + int min_x() const + { + return m_min_x; + } + int min_y() const + { + return m_min_y; + } + int max_x() const + { + return m_max_x; + } + int max_y() const + { + return m_max_y; + } + void sort_cells(); + unsigned total_cells() const + { + return m_num_cells; + } + unsigned scanline_num_cells(unsigned y) const + { + return m_sorted_y[y - m_min_y].num; + } + const cell_aa* const* scanline_cells(unsigned y) const + { + return m_sorted_cells.data() + m_sorted_y[y - m_min_y].start; + } + bool sorted() const + { + return m_sorted; + } +private: + outline_aa(const outline_aa&); + const outline_aa& operator = (const outline_aa&); + void set_cur_cell(int x, int y); + void add_cur_cell(); + void render_hline(int ey, int x1, int y1, int x2, int y2); + void render_line(int x1, int y1, int x2, int y2); + void allocate_block(); +private: + unsigned m_num_blocks; + unsigned m_max_blocks; + unsigned m_cur_block; + unsigned m_num_cells; + cell_aa** m_cells; + cell_aa* m_cur_cell_ptr; + pod_array<cell_aa*> m_sorted_cells; + pod_array<sorted_y> m_sorted_y; + cell_aa m_cur_cell; + int m_cur_x; + int m_cur_y; + int m_min_x; + int m_min_y; + int m_max_x; + int m_max_y; + bool m_sorted; +}; +class scanline_hit_test +{ +public: + scanline_hit_test(int x) : m_x(x), m_hit(false) {} + void reset_spans() {} + void finalize(int) {} + void add_cell(int x, int) + { + if(m_x == x) { + m_hit = true; + } + } + void add_span(int x, int len, int) + { + if(m_x >= x && m_x < x + len) { + m_hit = true; + } + } + unsigned num_spans() const + { + return 1; + } + bool hit() const + { + return m_hit; + } +private: + int m_x; + bool m_hit; +}; +enum filling_rule_e { + fill_non_zero, + fill_even_odd +}; +class rasterizer_scanline_aa +{ + enum status { + status_initial, + status_line_to, + status_closed + }; +public: + enum aa_scale_e { + aa_num = 1 << 8, + aa_mask = aa_num - 1, + aa_2num = aa_num * 2, + aa_2mask = aa_2num - 1 + }; + rasterizer_scanline_aa() : + m_filling_rule(fill_non_zero), + m_clipped_start_x(0), + m_clipped_start_y(0), + m_status(status_initial), + m_clipping(false) + { + } + ~rasterizer_scanline_aa() {} + void filling_rule(filling_rule_e filling_rule) + { + m_filling_rule = filling_rule; + } + 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(); + } + void reset() + { + m_outline.reset(); + m_status = status_initial; + } + void clip_box(FX_FLOAT x1, FX_FLOAT y1, FX_FLOAT x2, FX_FLOAT y2) + { + m_clip_box = rect(poly_coord(x1), poly_coord(y1), + poly_coord(x2), poly_coord(y2)); + m_clip_box.normalize(); + m_clipping = true; + } + void add_vertex(FX_FLOAT x, FX_FLOAT y, unsigned cmd) + { + if(is_close(cmd)) { + close_polygon(); + } else { + if(is_move_to(cmd)) { + move_to(poly_coord(x), poly_coord(y)); + } else { + if(is_vertex(cmd)) { + line_to(poly_coord(x), poly_coord(y)); + } + } + } + } + void move_to(int x, int y) + { + if(m_clipping) { + if(m_outline.sorted()) { + reset(); + } + if(m_status == status_line_to) { + close_polygon(); + } + m_prev_x = m_start_x = x; + m_prev_y = m_start_y = y; + m_status = status_initial; + m_prev_flags = clipping_flags(x, y, m_clip_box); + if(m_prev_flags == 0) { + move_to_no_clip(x, y); + } + } else { + move_to_no_clip(x, y); + } + } + void line_to(int x, int y) + { + if(m_clipping) { + clip_segment(x, y); + } else { + line_to_no_clip(x, y); + } + } + void close_polygon() + { + if (m_status != status_line_to) { + return; + } + if(m_clipping) { + clip_segment(m_start_x, m_start_y); + } + close_polygon_no_clip(); + } + AGG_INLINE unsigned calculate_alpha(int area, bool no_smooth) const + { + int cover = area >> (poly_base_shift * 2 + 1 - 8); + if(cover < 0) { + cover = -cover; + } + if(m_filling_rule == fill_even_odd) { + cover &= aa_2mask; + if(cover > aa_num) { + cover = aa_2num - cover; + } + } + if (no_smooth) { + cover = cover > aa_mask / 2 ? aa_mask : 0; + } + if(cover > aa_mask) { + cover = aa_mask; + } + return cover; + } + AGG_INLINE void sort() + { + m_outline.sort_cells(); + } + AGG_INLINE bool rewind_scanlines() + { + close_polygon(); + m_outline.sort_cells(); + if(m_outline.total_cells() == 0) { + return false; + } + m_cur_y = m_outline.min_y(); + return true; + } + AGG_INLINE bool navigate_scanline(int y) + { + close_polygon(); + m_outline.sort_cells(); + if(m_outline.total_cells() == 0 || + y < m_outline.min_y() || + y > m_outline.max_y()) { + return false; + } + m_cur_y = y; + return true; + } + template<class Scanline> bool sweep_scanline(Scanline& sl, bool no_smooth) + { + for(;;) { + if(m_cur_y > m_outline.max_y()) { + return false; + } + sl.reset_spans(); + unsigned num_cells = m_outline.scanline_num_cells(m_cur_y); + const cell_aa* const* cells = m_outline.scanline_cells(m_cur_y); + int cover = 0; + while(num_cells) { + const cell_aa* cur_cell = *cells; + int x = cur_cell->x; + int area = cur_cell->area; + unsigned alpha; + cover += cur_cell->cover; + while(--num_cells) { + cur_cell = *++cells; + if(cur_cell->x != x) { + break; + } + area += cur_cell->area; + cover += cur_cell->cover; + } + if(area) { + alpha = calculate_alpha((cover << (poly_base_shift + 1)) - area, no_smooth); + if(alpha) { + sl.add_cell(x, alpha); + } + x++; + } + if(num_cells && cur_cell->x > x) { + alpha = calculate_alpha(cover << (poly_base_shift + 1), no_smooth); + if(alpha) { + sl.add_span(x, cur_cell->x - x, alpha); + } + } + } + if(sl.num_spans()) { + break; + } + ++m_cur_y; + } + sl.finalize(m_cur_y); + ++m_cur_y; + return true; + } + template<class VertexSource> + void add_path(VertexSource& vs, unsigned path_id = 0) + { + FX_FLOAT x; + FX_FLOAT y; + unsigned cmd; + vs.rewind(path_id); + while(!is_stop(cmd = vs.vertex(&x, &y))) { + add_vertex(x, y, cmd); + } + } + template<class VertexSource> + void add_path_transformed(VertexSource& vs, const CFX_AffineMatrix* pMatrix, unsigned path_id = 0) + { + FX_FLOAT x; + FX_FLOAT y; + unsigned cmd; + vs.rewind(path_id); + while(!is_stop(cmd = vs.vertex(&x, &y))) { + if (pMatrix) { + pMatrix->Transform(x, y); + } + add_vertex(x, y, cmd); + } + } +private: + rasterizer_scanline_aa(const rasterizer_scanline_aa&); + const rasterizer_scanline_aa& + operator = (const rasterizer_scanline_aa&); + void move_to_no_clip(int x, int y) + { + if(m_status == status_line_to) { + close_polygon_no_clip(); + } + m_outline.move_to(x * 1, y); + m_clipped_start_x = x; + m_clipped_start_y = y; + m_status = status_line_to; + } + void line_to_no_clip(int x, int y) + { + if(m_status != status_initial) { + m_outline.line_to(x * 1, y); + m_status = status_line_to; + } + } + void close_polygon_no_clip() + { + if(m_status == status_line_to) { + m_outline.line_to(m_clipped_start_x * 1, m_clipped_start_y); + m_status = status_closed; + } + } + void clip_segment(int x, int y) + { + unsigned flags = clipping_flags(x, y, m_clip_box); + if(m_prev_flags == flags) { + if(flags == 0) { + if(m_status == status_initial) { + move_to_no_clip(x, y); + } else { + line_to_no_clip(x, y); + } + } + } else { + int cx[4]; + int cy[4]; + unsigned n = clip_liang_barsky(m_prev_x, m_prev_y, + x, y, + m_clip_box, + cx, cy); + const int* px = cx; + const int* py = cy; + while(n--) { + if(m_status == status_initial) { + move_to_no_clip(*px++, *py++); + } else { + line_to_no_clip(*px++, *py++); + } + } + } + m_prev_flags = flags; + m_prev_x = x; + m_prev_y = y; + } +private: + outline_aa m_outline; + filling_rule_e m_filling_rule; + int m_clipped_start_x; + int m_clipped_start_y; + int m_start_x; + int m_start_y; + int m_prev_x; + int m_prev_y; + unsigned m_prev_flags; + unsigned m_status; + rect m_clip_box; + bool m_clipping; + int m_cur_y; +}; +} +#endif |