public void FastAlphaBlending()
{
// http://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
// using premultiplied values
// out_a = a1 + a2 * (1 - a1)
// out_rgb = r1 + r2 * (1 - a1)
var c = new PixelArrayCanvas(0, 0);
var foreground = c.GetColor(System.Windows.Media.Colors.Green.ChangeAlpha(127));
var background = c.GetColor(System.Windows.Media.Colors.White.ChangeAlpha(127));
// get premultiplied components
var background_a = background >> 24 & 0xff;
var background_r = background >> 16 & 0xff;
var background_g = background >> 8 & 0xff;
var background_b = background & 0xff;
var foreground_a = foreground >> 24 & 0xff;
var foreground_r = foreground >> 16 & 0xff;
var foreground_g = foreground >> 8 & 0xff;
var foreground_b = foreground & 0xff;
var out_a = foreground_a + (1 - foreground_a) * background_a;
var out_r = foreground_r + (background_r) * (1 - foreground_a);// / out_a;
var out_g = foreground_g + (background_g) * (1 - foreground_a);// / out_a;
var out_b = foreground_b + (background_b) * (1 - foreground_a);// / out_a;
var pc = new PixelArrayCanvas(10, 10);
pc.DrawLineDDA(1, 1, 1, 8, foreground);
pc.DrawLineDDA(2, 1, 2, 8, background);
pc.DrawLineDDA(4, 1, 4, 2, PixelCanvas.GetColor((int)(out_a ),(int)(out_r ), (int)(out_g ),(int)(out_b )));
var pc3 = new PixelArrayCanvas(10,10);
pc3.DrawLineDDA(4,3,4,5, foreground);
pc.Blit(pc3, BlendMode.Alpha);
out_a = foreground_a + (1 - foreground_a) * background_a;
out_r = foreground_r + (background_r) * (1 - foreground_a) / out_a;
out_g = foreground_g + (background_g) * (1 - foreground_a) / out_a;
out_b = foreground_b + (background_b) * (1 - foreground_a) / out_a;
pc.DrawLineDDA(4, 6, 4, 8, PixelCanvas.GetColor((int)(out_a ), (int)(out_r ), (int)(out_g ), (int)(out_b )));
pc.Save(@"c:\temp\blend_xxx.bmp");
}
public void Blit()
{
var rd = new Random();
var rc = new RawDrawCommand((pc, ct) =>
{
pc.DrawRectangle(10, 10, 20, 20, pc.GetColor(Colors.Red));
});
var wpfc = new WpfDrawingContextDrawCommand((pc, cx, ct) =>
{
var c = pc.GetColor(Colors.Turquoise);
var pen = new Pen(Brushes.Turquoise, 2.0);
pen.Freeze();
for (int i = 0; i < 100; i++)
{
var p1 =
new Point(
rd.Next(1000, 1300),
rd.Next(1000, 1300));
var p2 =
new Point(
rd.Next(1000, 1300),
rd.Next(1000, 1300));
if (p1.ToPoint2D().Distance(p2.ToPoint2D()).IsLessThan(1))
continue;
pc.DrawLineWu((int)p1.X, (int)p1.Y, (int)p2.X, (int)p2.Y, c);
//_cx.DrawLine(pen, p1, p2);
}
});
var wpfc2 = new WpfDrawingContextDrawCommand((pc, cx, ct) =>
{
for (int i = 0; i < 1000; i++)
{
var pen = new Pen(Brushes.Moccasin, 2.0);
pen.Freeze();
cx.DrawLine(pen,
new Point(
rd.Next(750, 900),
rd.Next(750, 900)),
new Point(
rd.Next(750, 900),
rd.Next(750, 900)));
}
});
var wpfc3 = new WpfDrawingContextDrawCommand((pc, cx, ct) =>
{
for (int i = 0; i < 1000; i++)
{
var pen = new Pen(Brushes.Moccasin, 2.0);
pen.Freeze();
cx.DrawLine(pen,
new Point(
rd.Next(500, 600),
rd.Next(500, 600)),
new Point(
rd.Next(500, 600),
rd.Next(500, 600)));
}
});
var wpfc4 = new WpfDrawingContextDrawCommand((pc, cx, ct) =>
{
for (int i = 0; i < 1000; i++)
{
var pen = new Pen(Brushes.Ivory, 2.0);
pen.Freeze();
cx.DrawLine(pen,
new Point(
rd.Next(0, 2000),
rd.Next(50, 2500)),
new Point(
rd.Next(0, 2000),
rd.Next(50, 2500)));
}
});
var wpfc5 = new WpfDrawingContextDrawCommand((pc, cx, ct) =>
{
for (int i = 0; i < 1000; i++)
{
var pen = new Pen(Brushes.Navy, 2.0);
pen.Freeze();
cx.DrawLine(pen,
new Point(
rd.Next(0, 2000),
rd.Next(50, 500)),
new Point(
rd.Next(0, 2000),
rd.Next(50, 500)));
}
});
var wpfc6 = new WpfDrawingContextDrawCommand((pc, cx, ct) =>
{
for (int i = 0; i < 1000; i++)
{
var pen = new Pen(Brushes.Crimson, 2.0);
pen.Freeze();
cx.DrawLine(pen,
new Point(
rd.Next(100, 200),
rd.Next(100, 200)),
new Point(
rd.Next(100, 200),
rd.Next(100, 200)));
}
});
var wpfc7 = new WpfDrawingContextDrawCommand((pc, cx, ct) =>
{
for (int i = 0; i < 1000; i++)
{
var pen = new Pen(Brushes.Coral, 2.0);
pen.Freeze();
cx.DrawLine(pen,
new Point(
rd.Next(0, 50),
rd.Next(0, 50)),
new Point(
rd.Next(0, 50),
rd.Next(0, 50)));
}
});
var sw = Stopwatch.StartNew();
var canvas = new PixelArrayCanvas(2000, 2000);
Trace.WriteLine("CREATED " + sw.GetElapsedAndRestart().TotalMilliseconds);
//pc.Execute(new CanvasCommand[] { rc, wpfc, wpfc2, wpfc3, wpfc4, wpfc5, wpfc6, wpfc7 });
canvas.Execute(new CanvasCommand[] { rc, wpfc }, CancellationToken.None);
Trace.WriteLine("EXECUTE " + sw.GetElapsedAndRestart().TotalMilliseconds);
var bmp = canvas.ToWriteableBitmap();
Trace.WriteLine("BMP " + sw.GetElapsedAndRestart().TotalMilliseconds);
canvas.Save(@"c:\temp\shit\1.png");
Trace.WriteLine("SAVE " + sw.GetElapsedAndRestart().TotalMilliseconds);
//InvocationThrottle t = new InvocationThrottle();
//var total_ms = 0.0;
//for (int i = 0; i < 10000; i++)
//{
// Thread.Sleep(10);
// var g = Guid.NewGuid();
// var sw = Stopwatch.StartNew();
// t.InvokeAsync((ct) =>
// {
// Thread.Sleep(75);
// Trace.WriteLine("RUN TO COMPLETION");
// });
// sw.Stop();
// total_ms += sw.Elapsed.TotalMilliseconds;
// Trace.WriteLine("WAIT: " + sw.Elapsed.Milliseconds);
// Trace.WriteLine("WAIT ALL: " + total_ms);
//}
//Thread.Sleep(10000);
//var sw = Stopwatch.StartNew();
////for (int i = 0; i < 10000; i++)
//{
// var pen = new PixelArrayCanvas(10, 10);
// pen.DrawRectangle(0, 0, 3, 3, pen.GetColor(Colors.Red));
// var cv = new PixelArrayCanvas(1000, 1000);
// cv.DrawLineWu(100, 100, 900, 900, cv.GetColor(Colors.Red));
// cv.Save(@"c:\temp\shit\1.png");
//}
//sw.Stop();
//Trace.WriteLine(sw.Elapsed.TotalMilliseconds);
//int count = 100;
//var sw = Stopwatch.StartNew();
//Render(count, 100);
//Trace.WriteLine("100x100: " + sw.GetElapsedAndRestart().TotalMilliseconds);
//Render(count, 1000);
//Trace.WriteLine("1kx1k: " + sw.GetElapsedAndRestart().TotalMilliseconds);
//Render(count, 2000);
//Trace.WriteLine("2kx2k: " + sw.GetElapsedAndRestart().TotalMilliseconds);
}