// Returns the number of styles public int sweep_styles() { for (;;) { if (m_scan_y > m_Rasterizer.max_y()) { return(0); } int num_cells = (int)m_Rasterizer.scanline_num_cells(m_scan_y); cell_aa[] cells; int cellOffset = 0; int curCellOffset; m_Rasterizer.scanline_cells(m_scan_y, out cells, out cellOffset); int num_styles = (int)(m_max_style - m_min_style + 2); int style_id; int styleOffset = 0; m_cells.Allocate((int)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 > 0) { // Pre-add zero (for no-fill style, that is, -1). // We need that to ensure that the "-1 style" would go first. m_asm.Array[0] |= 1; m_ast.add(0); m_styles.Array[styleOffset].start_cell = 0; m_styles.Array[styleOffset].num_cells = 0; m_styles.Array[styleOffset].last_x = -0x7FFFFFFF; m_sl_start = cells[0].x; m_sl_len = (int)(cells[num_cells - 1].x - m_sl_start + 1); while (num_cells-- != 0) { curCellOffset = (int)cellOffset++; add_style(cells[curCellOffset].left); add_style(cells[curCellOffset].right); } // Convert the Y-histogram into the array of starting indexes int i; int start_cell = 0; style_info[] stylesArray = m_styles.Array; for (i = 0; i < m_ast.size(); i++) { int IndexToModify = (int)m_ast[i]; int v = stylesArray[IndexToModify].start_cell; stylesArray[IndexToModify].start_cell = start_cell; start_cell += v; } num_cells = (int)m_Rasterizer.scanline_num_cells(m_scan_y); m_Rasterizer.scanline_cells(m_scan_y, out cells, out cellOffset); while (num_cells-- > 0) { curCellOffset = (int)cellOffset++; style_id = (int)((cells[curCellOffset].left < 0) ? 0 : cells[curCellOffset].left - m_min_style + 1); styleOffset = (int)style_id; if (cells[curCellOffset].x == stylesArray[styleOffset].last_x) { cellOffset = stylesArray[styleOffset].start_cell + stylesArray[styleOffset].num_cells - 1; unchecked { cells[cellOffset].area += cells[curCellOffset].area; cells[cellOffset].cover += cells[curCellOffset].cover; } } else { cellOffset = stylesArray[styleOffset].start_cell + stylesArray[styleOffset].num_cells; cells[cellOffset].x = cells[curCellOffset].x; cells[cellOffset].area = cells[curCellOffset].area; cells[cellOffset].cover = cells[curCellOffset].cover; stylesArray[styleOffset].last_x = cells[curCellOffset].x; stylesArray[styleOffset].num_cells++; } style_id = (int)((cells[curCellOffset].right < 0) ? 0 : cells[curCellOffset].right - m_min_style + 1); styleOffset = (int)style_id; if (cells[curCellOffset].x == stylesArray[styleOffset].last_x) { cellOffset = stylesArray[styleOffset].start_cell + stylesArray[styleOffset].num_cells - 1; unchecked { cells[cellOffset].area -= cells[curCellOffset].area; cells[cellOffset].cover -= cells[curCellOffset].cover; } } else { cellOffset = stylesArray[styleOffset].start_cell + stylesArray[styleOffset].num_cells; cells[cellOffset].x = cells[curCellOffset].x; cells[cellOffset].area = -cells[curCellOffset].area; cells[cellOffset].cover = -cells[curCellOffset].cover; stylesArray[styleOffset].last_x = cells[curCellOffset].x; stylesArray[styleOffset].num_cells++; } } } if (m_ast.size() > 1) { break; } ++m_scan_y; } ++m_scan_y; if (m_layer_order != layer_order_e.layer_unsorted) { VectorPOD_RangeAdaptor ra = new VectorPOD_RangeAdaptor(m_ast, 1, m_ast.size() - 1); if (m_layer_order == layer_order_e.layer_direct) { QuickSort_range_adaptor_uint m_QSorter = new QuickSort_range_adaptor_uint(); m_QSorter.Sort(ra); //quick_sort(ra, uint_greater); } else { throw new System.NotImplementedException(); //QuickSort_range_adaptor_uint m_QSorter = new QuickSort_range_adaptor_uint(); //m_QSorter.Sort(ra); //quick_sort(ra, uint_less); } } return(m_ast.size() - 1); }
//-------------------------------------------------------------------- public bool sweep_scanline(IScanlineCache scanlineCache) { for (; ;) { if (m_scan_y > m_outline.max_y()) { return(false); } scanlineCache.ResetSpans(); int num_cells = (int)m_outline.scanline_num_cells(m_scan_y); cell_aa[] cells; int Offset; m_outline.scanline_cells(m_scan_y, out cells, out Offset); int cover = 0; while (num_cells != 0) { cell_aa cur_cell = cells[Offset]; int x = cur_cell.x; int area = cur_cell.area; int alpha; cover += cur_cell.cover; //accumulate all cells with the same X while (--num_cells != 0) { Offset++; cur_cell = cells[Offset]; if (cur_cell.x != x) { break; } area += cur_cell.area; cover += cur_cell.cover; } if (area != 0) { alpha = calculate_alpha((cover << ((int)poly_subpixel_scale_e.poly_subpixel_shift + 1)) - area); if (alpha != 0) { scanlineCache.add_cell(x, alpha); } x++; } if ((num_cells != 0) && (cur_cell.x > x)) { alpha = calculate_alpha(cover << ((int)poly_subpixel_scale_e.poly_subpixel_shift + 1)); if (alpha != 0) { scanlineCache.add_span(x, (cur_cell.x - x), alpha); } } } if (scanlineCache.num_spans() != 0) { break; } ++m_scan_y; } scanlineCache.finalize(m_scan_y); ++m_scan_y; return(true); }