/// <summary>
/// Render overlay graphic.
/// </summary>
/// <param name="pixels">Pixels subject to rendering.</param>
/// <param name="width"></param>
/// <param name="height"></param>
public void Render(int[] pixels, int width, int height)
{
if (_scaledData == null)
{
_scaledData = (GrayscalePixelDataU8)_originalData.Rescale(_scale);
}
var data = _scaledData.Data;
var ox = (int)(_offsetX * _scale);
var oy = (int)(_offsetY * _scale);
Parallel.For(0, _scaledData.Height, y =>
{
if (oy + y >= height)
{
return;
}
for (int i = _scaledData.Width * y, e = i + _scaledData.Width, p = (oy + y) * width + ox, x = 0; i < e; i++, p++, x++)
{
if (data[i] > 0)
{
if (ox + x >= width)
{
break;
}
pixels[p] |= _color;
}
}
}
);
}
/// <summary>
/// Initialize new instance of <seealso cref="OverlayGraphic"/>
/// </summary>
/// <param name="pixelData">Overlay pixel data</param>
/// <param name="offsetx">X offset</param>
/// <param name="offsety">Y offset</param>
/// <param name="color">The color of the resulting overlay</param>
public OverlayGraphic(SingleBitPixelData pixelData, int offsetx, int offsety, int color)
{
_originalData = pixelData;
_scaledData = _originalData;
_offsetX = offsetx;
_offsetY = offsety;
_color = color;
_scale = 1.0;
}
/// <summary>
/// Set overlay scale factor.
/// </summary>
/// <param name="scale">Scale factor.</param>
public void Scale(double scale)
{
if ((scale - _scale).IsNearlyZero())
{
return;
}
_scale = scale;
_scaledData = null;
}