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debian/missing-sources/plupload-1.5.7/csharp/Plupload/FJCore/Filter/FilterLowpassResize.cs

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/// Copyright (c) 2009 Jeffrey Powers for Occipital Open Source.

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/// Under the MIT License, details: License.txt.

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namespace FluxJpeg.Core.Filtering

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{

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    using System;

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    internal class LowpassResize : Filter

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    {

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        protected override void ApplyFilter()

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        {

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            // get source image size

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            int width = _sourceData[0].GetLength(0),

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                height = _sourceData[0].GetLength(1);

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            int channels = _sourceData.Length;

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            // Estimate a good filter size for the gaussian.

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            // Note that gaussian isn't an ideal bandpass filter

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            //  so this is an experimentally determined quantity

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            double std = (width / _newWidth) * 0.50;

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            for(int i = 0; i < channels; i++)

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            {

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                GrayImage channel = new GrayImage(_sourceData[i]);

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                channel = Convolution.Instance.GaussianConv(channel, std);

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                _sourceData[i] = channel.ToByteArray2D();

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            }

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            // number of pixels to shift in the original image

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            double xStep = (double)width / _newWidth,

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                   yStep = (double)height / _newHeight;

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            NNResize resizer = new NNResize();

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             _destinationData = resizer.Apply(_sourceData, _newWidth, _newHeight);

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        }

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    }

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}

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