/// <summary>
/// Initializes a new instance of the Rasterizer class.
/// </summary>
public Rasterizer()
{
m_filling_rule = FillingRule.FillNonZero;
m_outline = new Outline();
m_scanline = new Scanline();
m_gamma = new byte[256];
Array.Copy(defaultGamma, m_gamma, m_gamma.Length);
}
/// <summary>
/// Renders the specified scanline in the specified color into the
/// rendering buffer.
/// </summary>
/// <param name="scanline">The scanline to render.</param>
/// <param name="color">The color to render the scanline.</param>
public void Render(Scanline scanline, Color color)
{
if (scanline.Y < 0 || scanline.Y >= m_rbuf.Height)
{
return;
}
int base_x = scanline.BaseX;
int y = scanline.Y;
RowIterator row = m_rbuf.Row(y);
Scanline.Iterator span = new Scanline.Iterator(scanline);
for (int num_spans = scanline.SpanCount; num_spans > 0; num_spans--)
{
int x = span.Next() + base_x;
CoverageIterator covers = span.Covers();
int num_pix = span.PixelCount();
if (x < 0)
{
num_pix += x;
if (num_pix <= 0)
{
continue;
}
covers -= x;
x = 0;
}
if (x + num_pix >= m_rbuf.Width)
{
num_pix = m_rbuf.Width - x;
if (num_pix <= 0)
{
continue;
}
}
m_span.Render(row, x, num_pix, covers, color);
}
}
/// <summary>
/// Initializes a new instance of the Iterator class using the
/// specified scanline.
/// </summary>
/// <param name="scanline">The scanline.</param>
public Iterator(Scanline scanline)
{
m_covers = new CoverageIterator(scanline.m_covers);
m_counts = scanline.m_counts;
m_start_indeces = scanline.m_start_indeces;
}