Graphics.SmoothingMode resets to Default when RequiresSmoothRendering is true

[ds1709]

Description

Graphics.SmoothingMode resets to Default when RequiresSmoothRendering is true.

Example data

var g = Graphics.FromHwnd(IntPtr.Zero);
var renderer = SvgRenderer.FromGraphics(g);
var visualElement = new SvgLine { ShapeRendering = SvgShapeRendering.Auto };

g.SmoothingMode = SmoothingMode.AntiAlias; // Initializing SmoothingMode for Graphics.

visualElement.RenderElement(renderer); // Calling rendering.

Assert.That(g.SmoothingMode, Is.EqualTo(SmoothingMode.AntiAlias)); // Fail, coz actual is Default.

Used Versions

3.2.3

Solution

protected internal virtual void RenderFillAndStroke(ISvgRenderer renderer)
{
    var smoothingMode = renderer.SmoothingMode;
    try
    {
        // If this element needs smoothing enabled turn anti-aliasing on
        if (RequiresSmoothRendering)
            renderer.SmoothingMode = SmoothingMode.AntiAlias;

        RenderFill(renderer);
        RenderStroke(renderer);
    }
    finally
    {
        // Reset the smoothing mode
        if (RequiresSmoothRendering && renderer.SmoothingMode == SmoothingMode.AntiAlias)
            renderer.SmoothingMode = smoothingMode;
    }
}