Re: How can I blur a image?

[Brian Osman]

I'm not sure what's exposed in SkiaSharp, but you want to be using an ImageFilter, rather than a MaskFilter. Mask filters affect the geometry (which for a single image, is just a rectangle - they effectively blur the "shape", but not the contents of that shape), while image filters affect all the pixels within the shape.

This uses C++ Skia code, but you should be able to translate it to SkiaSharp: https://fiddle.skia.org/c/e1094f2d082a5c9dd074be8149c76b23

On Sun, Dec 10, 2017, 12:41 AM Miranda <hardly.a....@gmail.com> wrote:

Right now I'm using Skia through the SkiaSharp wrapper.

I really new to Skia, so I'm not really sure how to do even the most basic things...

As far as I know, I should avoid using SKBitmap since it's going to be deprecated in in the future (right?).
So I'm using a "image" as input and a "surface" as output.

I created a paint, a blur filter and then set the paint's filter to the blur filter.

Then I draw the image on the surface using the paint and save it.
But the output image is exactly equal to the input.

So uh... How can I blur a image?

Here's the piece of code I wrote:

            using (var image = SKImage.FromEncodedData(SKData.Create(@"../../../images/testInput.bmp")))

            using (var surface = SKSurface.Create(info: new SKImageInfo(image.Width, image.Height)))

            using (var canvas = surface.Canvas)

            using (var paint = new SKPaint())

            using (var filter = SKMaskFilter.CreateBlur(blurStyle: SKBlurStyle.Normal, sigma: 10, flags: SKBlurMaskFilterFlags.HighQuality)) {

                paint.IsAntialias = true;

                paint.MaskFilter = filter;

                paint.BlendMode = SKBlendMode.Difference;

                canvas.DrawImage(image, 0, 0, paint);

                using (var snapshot = surface.Snapshot())

                using (var data = snapshot.Encode(format: SkiaSharp.SKEncodedImageFormat.Png, quality: 100)) {

                    if (data == null)

                        throw new InvalidOperationException(nameof(SkiaSharp) + " failed... And didn't explain why.");

                    using (var fileStream = new FileStream(@"../../../images/testOutput.bmp", FileMode.Create))

                        data.SaveTo(fileStream);

                }

                System.Environment.Exit(1);

                throw new NotImplementedException();

            }

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[Hal Canary]

i was about to say this:

https://fiddle.skia.org/c/9ca7df3d424edb87653c56f7cd506d92

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