// 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);
}
