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/*
* GNU AFFERO GENERAL PUBLIC LICENSE
* Version 3, 19 November 2007
* Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
* Everyone is permitted to copy and distribute verbatim copies
* of this license document, but changing it is not allowed.
*/
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using Emgu.CV;
using Emgu.CV.CvEnum;
namespace UVtools.Core.Extensions
{
public static class EmguExtensions
{
/// <summary>
/// Gets a single pixel span to manipulate or read pixels
/// </summary>
/// <typeparam name="T">Pixel type</typeparam>
/// <param name="mat"><see cref="Mat"/> Input</param>
/// <returns>A <see cref="Span{T}"/> containing all pixels in data memory</returns>
public static unsafe Span<T> GetPixelSpan<T>(this Mat mat)
{
return new Span<T>(mat.DataPointer.ToPointer(), mat.GetLength());
}
public static Span<T> GetPixelRowSpan<T>(this Mat mat, int y)
{
int offset = y * mat.Step;
//IntPtr ptr = IntPtr.Add(mat.DataPointer, offset);
return mat.GetPixelSpan<T>().Slice(offset, mat.Step);
}
/// <summary>
/// Scale image from it center, preserving src bounds
/// https://stackoverflow.com/a/62543674/933976
/// </summary>
/// <param name="src"><see cref="Mat"/> to transform</param>
/// <param name="xScale">X scale factor</param>
/// <param name="yScale">Y scale factor</param>
/// <param name="xTrans">X translation</param>
/// <param name="yTrans">Y translation</param>
/// <param name="interpolation">Interpolation mode</param>
public static void ScaleFromCenter(this Mat src, double xScale, double yScale, double xTrans = 0, double yTrans = 0, Inter interpolation = Inter.Linear)
{
//var dst = new Mat(src.Size, src.Depth, src.NumberOfChannels);
var translateTransform = new Matrix<double>(2, 3)
{
[0, 0] = xScale, // xScale
[1, 1] = yScale, // yScale
[0, 2] = xTrans + (src.Width - src.Width * xScale) / 2.0, //x translation + compensation of x scaling
[1, 2] = yTrans + (src.Height - src.Height * yScale) / 2.0 // y translation + compensation of y scaling
};
CvInvoke.WarpAffine(src, src, translateTransform, src.Size, interpolation);
}
/// <summary>
/// Copy a <see cref="Mat"/> to center of other <see cref="Mat"/>
/// </summary>
/// <param name="src">Source <see cref="Mat"/> to be copied to</param>
/// <param name="dst">Target <see cref="Mat"/> to paste the <param name="src"></param></param>
public static void CopyToCenter(this Mat src, Mat dst)
{
if (dst.Step > src.Step && dst.Height > src.Height)
{
var dx = Math.Abs(dst.Step - src.Step) / 2;
var dy = Math.Abs(dst.Height - src.Height) / 2;
Mat m = new Mat(dst, new Rectangle(dx, dy, src.Width, src.Height));
src.CopyTo(m);
}
else if (dst.Step < src.Step && dst.Height < src.Height)
{
var dx = Math.Abs(dst.Step - src.Step) / 2;
var dy = Math.Abs(dst.Height - src.Height) / 2;
Mat m = new Mat(src, new Rectangle(dx, dy, dst.Width, dst.Height));
m.CopyTo(dst);
}
}
/// <summary>
/// Gets the total length of this <see cref="Mat"/></param>
/// </summary>
/// <param name="mat"></param>
/// <returns>The total length of this <see cref="Mat"/></returns>
public static int GetLength(this Mat mat)
{
return mat.Step * mat.Height;
}
/// <summary>
/// Gets a pixel index position on a span given X and Y
/// </summary>
/// <param name="mat"></param>
/// <param name="x">X coordinate</param>
/// <param name="y">Y coordinate</param>
/// <returns>The pixel index position</returns>
public static int GetPixelPos(this Mat mat, int x, int y)
{
return y * mat.Step + x * mat.NumberOfChannels;
}
/// <summary>
/// Gets a pixel index position on a span given X and Y
/// </summary>
/// <param name="mat"></param>
/// <param name="point">X and Y Location</param>
/// <returns>The pixel index position</returns>
public static int GetPixelPos(this Mat mat, Point point)
{
return point.Y * mat.Step + point.X * mat.NumberOfChannels;
}
/// <summary>
/// Gets a byte array copy of this <see cref="Mat"/>
/// </summary>
/// <param name="mat"></param>
/// <returns>Byte array </returns>
public static byte[] GetBytes(this Mat mat)
{
byte[] data = new byte[mat.GetLength()];
Marshal.Copy(mat.DataPointer, data, 0, data.Length);
return data;
/*GCHandle handle = GCHandle.Alloc(data, GCHandleType.Pinned);
using (Mat m2 = new Mat(mat.Size, mat.Depth, mat.NumberOfChannels, handle.AddrOfPinnedObject(),
mat.Width * mat.NumberOfChannels))
{
mat.CopyTo(m2);
}
handle.Free();*/
}
/// <summary>
/// Create a byte array of size of this <see cref="Mat"/>
/// </summary>
/// <param name="mat"></param>
/// <returns>Blank byte array</returns>
public static byte[] CreateByteArray(this Mat mat)
{
return new byte[mat.GetLength()];
}
/// <summary>
/// Clone this <see cref="Mat"/> blanked (All zeros)
/// </summary>
/// <param name="mat"></param>
/// <returns>Blanked <see cref="Mat"/></returns>
public static Mat CloneBlank(this Mat mat)
{
return new Mat(new Size(mat.Width, mat.Height), mat.Depth, mat.NumberOfChannels);
}
public static byte GetByte(this Mat mat, int pos)
{
var value = new byte[1];
Marshal.Copy(mat.DataPointer + pos * mat.ElementSize, value, 0, value.Length);
return value[0];
}
public static byte GetByte(this Mat mat, int x, int y) => GetByte(mat, y * mat.Cols + x);
public static void SetByte(this Mat mat, int pixel, byte value) => SetByte(mat, pixel, new[] {value});
public static void SetByte(this Mat mat, int pixel, byte[] value)
{
Marshal.Copy(value, 0, mat.DataPointer + pixel * mat.ElementSize, value.Length);
}
public static void SetByte(this Mat mat, int x, int y, byte value) =>
SetByte(mat, x, y, new[] {value});
public static void SetByte(this Mat mat, int x, int y, byte[] value) =>
SetByte(mat, y * mat.Cols + x, value);
public static void SetBytes(this Mat mat, byte[] value)
{
Marshal.Copy(value, 0, mat.DataPointer, value.Length);
}
}
}
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