/// <summary>
/// for fill shape
/// </summary>
/// <param name="sclineRas"></param>
/// <param name="scline"></param>
/// <param name="color"></param>
/// <param name="shapeHint"></param>
public void FillWithColor(GLScanlineRasterizer sclineRas,
GLScanline scline,
PixelFarm.Drawing.Color color)
{
//early exit
if (color.A == 0)
{
return;
}
if (!sclineRas.RewindScanlines())
{
return;
}
//-----------------------------------------------
scline.ResetSpans(sclineRas.MinX, sclineRas.MaxX);
//-----------------------------------------------
var lineBuff = this.myLineBuffer;
lineBuff.Clear();
while (sclineRas.SweepScanline(scline))
{
int y = scline.Y;
lineBuff.BeginNewLine(y);
int num_spans = scline.SpanCount;
byte[] covers = scline.GetCovers();
//copy data from scanline to lineBuff
//TODO: move linebuf built into the scanline?
for (int i = 1; i <= num_spans; ++i)
{
ScanlineSpan span = scline.GetSpan(i);
if (span.len > 0)
{
//outline
GLBlendSolidHSpan(span.x, span.len, true, lineBuff, color.A, covers, span.cover_index);
}
else
{
//fill
int x = span.x;
int x2 = (x - span.len - 1);
GLBlendHLine(x, x2, true, lineBuff, color.A, covers[span.cover_index]);
}
}
lineBuff.CloseLine();
}
//----------------------------------
int nelements = myLineBuffer.Count;
if (nelements > 0)
{
this.scanlineShader.AggDrawLines(myLineBuffer, nelements, color);
}
}
/// <summary>
/// for fill shape
/// </summary>
/// <param name="sclineRas"></param>
/// <param name="scline"></param>
/// <param name="color"></param>
/// <param name="shapeHint"></param>
public void FillWithColor(GLScanlineRasterizer sclineRas,
GLScanline scline,
PixelFarm.Drawing.Color color)
{
//early exit
if (color.A == 0)
{
return;
}
if (!sclineRas.RewindScanlines())
{
return;
}
//-----------------------------------------------
scline.ResetSpans(sclineRas.MinX, sclineRas.MaxX);
//-----------------------------------------------
this.mySinglePixelBuffer.Clear();
this.myLineBuffer.Clear();
while (sclineRas.SweepScanline(scline))
{
int y = scline.Y;
int num_spans = scline.SpanCount;
byte[] covers = scline.GetCovers();
for (int i = 1; i <= num_spans; ++i)
{
ScanlineSpan span = scline.GetSpan(i);
if (span.len > 0)
{
//outline
GLBlendSolidHSpan(span.x, y, span.len, color, covers, span.cover_index);
}
else
{
//fill
int x = span.x;
int x2 = (x - span.len - 1);
GLBlendHLine(x, y, x2, color, covers[span.cover_index]);
}
}
}
DrawPointAndLineWithVertices();
}
//--------------------------------------------------------------------
internal bool SweepScanline(GLScanline scline)
{
for (; ; )
{
if (m_scan_y > m_cellAARas.MaxY)
{
return false;
}
scline.ResetSpans();
CellAA[] cells;
int offset;
int num_cells;
m_cellAARas.GetCells(m_scan_y, out cells, out offset, out num_cells);
int cover = 0;
while (num_cells != 0)
{
unsafe
{
fixed (CellAA* cur_cell_h = &cells[0])
{
CellAA* cur_cell_ptr = cur_cell_h + offset;
int alpha;
int x = cur_cell_ptr->x;
int area = cur_cell_ptr->area;
cover += cur_cell_ptr->cover;
//accumulate all cells with the same X
while (--num_cells != 0)
{
offset++; //move next
cur_cell_ptr++; //move next
if (cur_cell_ptr->x != x)
{
break;
}
area += cur_cell_ptr->area;
cover += cur_cell_ptr->cover;
}
if (area != 0)
{
alpha = CalculateAlpha((cover << (poly_subpix.SHIFT + 1)) - area);
if (alpha != 0)
{
scline.AddCell(x, alpha);
}
x++;
}
if ((num_cells != 0) && (cur_cell_ptr->x > x))
{
alpha = CalculateAlpha(cover << (poly_subpix.SHIFT + 1));
if (alpha != 0)
{
scline.AddSpan(x, (cur_cell_ptr->x - x), alpha);
}
}
}
}
}
if (scline.SpanCount != 0) { break; }
++m_scan_y;
}
scline.CloseLine(m_scan_y);
++m_scan_y;
return true;
}