public void Lock()
{
if (!isLocked)
{
bmpData = Bmp.LockBits(new System.Drawing.Rectangle(0, 0, Width, Height), ImageLockMode.ReadWrite, Bmp.PixelFormat);
}
isLocked = true;
}
public void Render(Graphics g, Rectangle area, long start, long count, long step)
{
if (Bmp == null)
{
return;
}
var spectrums = Data.Iterate(start, area.Width, step);
var x = 0;
const int pixelSize = 3;
var bmd = Bmp.LockBits(new Rectangle(0, 0, Bmp.Width, Bmp.Height), ImageLockMode.ReadWrite, Bmp.PixelFormat);
unsafe
{
foreach (var spectrum in spectrums)
{
var skip = spectrum.Length / (double)area.Height / 2;
if (spectrum.Length > 0)
{
var row = (byte *)bmd.Scan0;
var yy = area.Height - 1;
for (var y = 0; y < bmd.Height - 1; y++)
{
var idx = (int)(yy-- *skip);
if (idx < 0)
{
idx = 0;
}
if (idx >= spectrum.Length)
{
idx = spectrum.Length - 1;
}
var value = (int)(255 * spectrum[idx]);
if (value > 255)
{
value = 255;
}
if (value < 0)
{
value = 0;
}
var pixelColor = Palette[value];
row[x + 0] = pixelColor.B;
row[x + 1] = pixelColor.G;
row[x + 2] = pixelColor.R;
row += bmd.Stride;
}
}
x += pixelSize;
}
}
Bmp.UnlockBits(bmd);
g.DrawImage(Bmp, area.Location);
}