[Windows] Allow setting PlatformCanvas.Antialias

[MartyIX]

Description of Change

The documentation seems to be here: https://microsoft.github.io/Win2D/WinUI3/html/P_Microsoft_Graphics_Canvas_CanvasDrawingSession_Antialiasing.htm

Observations: Antialising seems to be on by default.

Tests

My testing code

public void Draw(ICanvas canvas, RectF dirtyRect)
{
#if WINDOWS
    var platformCanvas = (Microsoft.Maui.Graphics.Win2D.W2DCanvas)canvas;
    platformCanvas.Session.Antialiasing = Microsoft.Graphics.Canvas.CanvasAntialiasing.Aliased; // EITHER THIS
    // platformCanvas.Session.Antialiasing = Microsoft.Graphics.Canvas.CanvasAntialiasing.Antialiased; // ... OR THIS
#endif

    // Left border line.
    canvas.StrokeColor = this.BorderColorLeft;
    canvas.StrokeSize = (float)this.BorderWidth.Left;
    canvas.DrawLine(0, 0, 0, dirtyRect.Height);

    // Top border line.
    canvas.StrokeColor = this.BorderColorTop;
    canvas.StrokeSize = (float)this.BorderWidth.Top;
    canvas.DrawLine(0, 0, dirtyRect.Width, 0);

    // Right border line.
    canvas.StrokeColor = this.BorderColorRight;
    canvas.StrokeSize = (float)this.BorderWidth.Right;
    canvas.DrawLine(dirtyRect.Width, 0, dirtyRect.Width, dirtyRect.Height);

    // Bottom border line.
    canvas.StrokeColor = this.BorderColorBottom;
    canvas.StrokeSize = (float)this.BorderWidth.Bottom;
    canvas.DrawLine(0, dirtyRect.Height, dirtyRect.Width, dirtyRect.Height);
}

Results:

• With antialising ON (CanvasAntialiasing.Antialiased):
  

• With antialising OFF (CanvasAntialiasing.Aliased):
  

So it appears the PR works.

[jonathanpeppers]

/azp run

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