CodeLab Tutorial Part 3 - Complex

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#region UICode
IntSliderControl Amount1 = 10; // [0,100] Gaussian Blur Radius
#endregion

// Working surface
Surface wrk = null;

// Setup for calling the Gaussian Blur effect
GaussianBlurEffect gaussianblurEffect = new GaussianBlurEffect();
PropertyCollection gaussianblurProps;

// Setup for selected blending op
private BinaryPixelOp darkenOp = LayerBlendModeUtil.CreateCompositionOp(LayerBlendMode.Darken);

protected override void OnDispose(bool disposing)
{
    if (disposing)
    {
        // Release any surfaces or effects you've created
        wrk?.Dispose(); wrk = null;
        gaussianblurEffect?.Dispose(); gaussianblurEffect = null;
    }

    base.OnDispose(disposing);
}

// This single-threaded function is called after the UI changes and before the Render function is called
// The purpose is to prepare anything you'll need in the Render function
void PreRender(Surface dst, Surface src)
{
    if (wrk == null)
    {
        wrk = new Surface(src.Size);
    }

    // Gaussian Blur
    gaussianblurEffect.EnvironmentParameters = EnvironmentParameters;
    gaussianblurProps = gaussianblurEffect.CreatePropertyCollection();
    PropertyBasedEffectConfigToken gaussianblurParameters = new PropertyBasedEffectConfigToken(gaussianblurProps);
    gaussianblurParameters.SetPropertyValue(GaussianBlurEffect.PropertyNames.Radius, Amount1);
    gaussianblurEffect.SetRenderInfo(gaussianblurParameters, new RenderArgs(wrk), new RenderArgs(src));
    if (IsCancelRequested) return;
    gaussianblurEffect.Render(new Rectangle[1] {wrk.Bounds},0,1);
}

// Here is the main multi-threaded render function
// The dst canvas is broken up into rectangles and
// your job is to write to each pixel of that rectangle
void Render(Surface dst, Surface src, Rectangle rect)
{
    // Darken Blend the src surface and the wrk surface to the dst surface
    darkenOp.Apply(dst, wrk, src, rect);


    // Step through each row of the current rectangle
    for (int y = rect.Top; y < rect.Bottom; y++)
    {
        if (IsCancelRequested) return;
        // Step through each pixel on the current row of the rectangle
        for (int x = rect.Left; x < rect.Right; x++)
        {
            ColorBgra SrcPixel = src[x,y];
            ColorBgra WrkPixel = wrk[x,y];
            ColorBgra DstPixel = dst[x,y];

            ColorBgra CurrentPixel = DstPixel;

            // TODO: Add additional pixel processing code here


            dst[x,y] = CurrentPixel;
        }
    }
}

    // Step through each row of the current rectangle
    for (int y = rect.Top; y < rect.Bottom; y++)
    {
        if (IsCancelRequested) return;
        // Step through each pixel on the current row of the rectangle
        for (int x = rect.Left; x < rect.Right; x++)
        {
            ColorBgra SrcPixel = src[x,y];
            ColorBgra WrkPixel = wrk[x,y];
            ColorBgra DstPixel = dst[x,y];

            ColorBgra CurrentPixel = DstPixel;

            // TODO: Add additional pixel processing code here


            dst[x,y] = CurrentPixel;
        }
    }

CurrentPixel = ColorBgra.FromBgraClamped(
    (CurrentPixel.G - 204) * (float)5,
    (CurrentPixel.G - 140) * (float)2.2173,
    CurrentPixel.R,
    CurrentPixel.A
);