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MagickImageLuminanceSource.cs
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MagickImageLuminanceSource.cs
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/*
* Copyright 2017 ZXing.Net authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using ImageMagick;
namespace ZXing.Magick
{
/// <summary>
/// A luminance source class which consumes a MagickImage image from ImageMagick and calculates the luminance values based on the bytes of the image
/// </summary>
public class MagickImageLuminanceSource : BaseLuminanceSource
{
/// <summary>
/// initializing constructor
/// </summary>
/// <param name="image"></param>
public MagickImageLuminanceSource(IMagickImage image)
: base(CalculateLuminance(image), image.Width, image.Height)
{
}
/// <summary>
/// internal constructor used by CreateLuminanceSource
/// </summary>
/// <param name="luminances"></param>
/// <param name="width"></param>
/// <param name="height"></param>
protected MagickImageLuminanceSource(byte[] luminances, int width, int height)
: base(luminances, width, height)
{
}
/// <summary>
/// Should create a new luminance source with the right class type.
/// The method is used in methods crop and rotate.
/// </summary>
/// <param name="newLuminances">The new luminances.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <returns></returns>
protected override LuminanceSource CreateLuminanceSource(byte[] newLuminances, int width, int height)
{
return new MagickImageLuminanceSource(newLuminances, width, height);
}
private static byte[] CalculateLuminance(IMagickImage src)
{
if (src == null)
throw new ArgumentNullException(nameof(src));
if (src.DetermineBitDepth() < 8)
src.SetBitDepth(8);
return src.ToByteArray(MagickFormat.Gray);
}
}
}