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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.Collections;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using PrusaSL1Reader.Extensions;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using Point = System.Drawing.Point;
namespace PrusaSL1Reader
{
#region LayerIsland Class
public class LayerIsland : IEnumerable<Point>
{
/// <summary>
/// Gets the layer who own this island
/// </summary>
public Layer Owner { get; }
public uint X => (uint) Pixels[0].X;
public uint Y => (uint)Pixels[0].Y;
public Point Point => new Point((int) X, (int) Y);
/// <summary>
/// Gets pixels locations
/// </summary>
public Point[] Pixels { get; }
/// <summary>
/// Gets the number of pixels on this island
/// </summary>
public uint Size => (uint) Pixels.Length;
public LayerIsland(Layer owner, Point[] pixels)
{
Owner = owner;
Pixels = pixels;
}
public Point this[uint index] => Pixels[index];
public Point this[int index] => Pixels[index];
public IEnumerator<Point> GetEnumerator()
{
return ((IEnumerable<Point>)Pixels).GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
#endregion
#region Layer Class
/// <summary>
/// Represent a Layer
/// </summary>
public class Layer : IEquatable<Layer>, IEquatable<uint>
{
#region Properties
/// <summary>
/// Gets the parent layer manager
/// </summary>
public LayerManager ParentLayerManager { get; set; }
/// <summary>
/// Gets the layer index
/// </summary>
public uint Index { get; }
private byte[] _rawData;
/// <summary>
/// Gets or sets layer image compressed data
/// </summary>
public byte[] RawData
{
get => LayerManager.DecompressLayer(_rawData);
set
{
_rawData = LayerManager.CompressLayer(value);
IsModified = true;
}
}
/// <summary>
/// Gets the original filename, null if no filename attached with layer
/// </summary>
public string Filename { get; set; }
/// <summary>
/// Gets if layer has been modified
/// </summary>
public bool IsModified { get; set; }
/// <summary>
/// Gets or sets a new image instance
/// </summary>
public Image<L8> Image
{
get => SixLabors.ImageSharp.Image.Load<L8>(RawData);
set
{
using (MemoryStream stream = new MemoryStream())
{
value.Save(stream, Helpers.PngEncoder);
RawData = stream.ToArray();
}
}
}
#endregion
#region Constructor
public Layer(uint index, byte[] rawData, string filename = null, LayerManager pararentLayerManager = null)
{
Index = index;
RawData = rawData;
Filename = filename ?? $"Layer{index}.png";
IsModified = false;
ParentLayerManager = pararentLayerManager;
}
public Layer(uint index, Image<L8> image, string filename = null, LayerManager pararentLayerManager = null) : this(index, new byte[0], filename, pararentLayerManager)
{
Image = image;
IsModified = false;
}
public Layer(uint index, Stream stream, string filename = null, LayerManager pararentLayerManager = null) : this(index, stream.ToArray(), filename, pararentLayerManager)
{ }
#endregion
#region Equatables
public static bool operator ==(Layer obj1, Layer obj2)
{
return obj1.Equals(obj2);
}
public static bool operator !=(Layer obj1, Layer obj2)
{
return !obj1.Equals(obj2);
}
public static bool operator >(Layer obj1, Layer obj2)
{
return obj1.Index > obj2.Index;
}
public static bool operator <(Layer obj1, Layer obj2)
{
return obj1.Index < obj2.Index;
}
public static bool operator >=(Layer obj1, Layer obj2)
{
return obj1.Index >= obj2.Index;
}
public static bool operator <=(Layer obj1, Layer obj2)
{
return obj1.Index <= obj2.Index;
}
public bool Equals(uint other)
{
return Index == other;
}
public bool Equals(Layer other)
{
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return Equals(_rawData, other._rawData);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != this.GetType()) return false;
return Equals((Layer)obj);
}
public override int GetHashCode()
{
return (_rawData != null ? _rawData.GetHashCode() : 0);
}
private sealed class IndexRelationalComparer : IComparer<Layer>
{
public int Compare(Layer x, Layer y)
{
if (ReferenceEquals(x, y)) return 0;
if (ReferenceEquals(null, y)) return 1;
if (ReferenceEquals(null, x)) return -1;
return x.Index.CompareTo(y.Index);
}
}
public static IComparer<Layer> IndexComparer { get; } = new IndexRelationalComparer();
#endregion
#region Formaters
public override string ToString()
{
return $"{nameof(Filename)}: {Filename}, {nameof(IsModified)}: {IsModified}";
}
#endregion
#region Methods
public Layer PreviousLayer()
{
if (ReferenceEquals(ParentLayerManager, null) || Index == 0)
return null;
return ParentLayerManager[Index - 1];
}
public Layer NextLayer()
{
if (ReferenceEquals(ParentLayerManager, null) || Index >= ParentLayerManager.Count - 1)
return null;
return ParentLayerManager[Index + 1];
}
/// <summary>
/// Gets all islands start pixel location for this layer
/// https://www.geeksforgeeks.org/find-number-of-islands/
/// </summary>
/// <returns><see cref="List{T}"/> holding all islands coordinates</returns>
public List<LayerIsland> GetIslandsLocation(uint requiredPixelsToSupportIsland = 5)
{
if (requiredPixelsToSupportIsland == 0)
requiredPixelsToSupportIsland = 1;
// These arrays are used to
// get row and column numbers
// of 8 neighbors of a given cell
List<LayerIsland> result = new List<LayerIsland>();
List<Point> pixels = new List<Point>();
if (Index == 0) return result;
sbyte[] rowNbr = { -1, -1, -1, 0, 0, 1, 1, 1 };
sbyte[] colNbr = { -1, 0, 1, -1, 1, -1, 0, 1 };
const uint minPixel = 10;
const uint minPixelForSupportIsland = 200;
int pixelIndex;
uint islandSupportingPixels;
var image = Image;
byte[] bytes = null;
if (image.TryGetSinglePixelSpan(out var pixelSpan))
{
bytes = MemoryMarshal.AsBytes(pixelSpan).ToArray();
}
var previousLayerImage = PreviousLayer()?.Image;
byte[] previousBytes = null;
if (!ReferenceEquals(previousLayerImage, null))
{
if (previousLayerImage.TryGetSinglePixelSpan(out var previousPixelSpan))
{
previousBytes = MemoryMarshal.AsBytes(previousPixelSpan).ToArray();
}
}
// Make a bool array to
// mark visited cells.
// Initially all cells
// are unvisited
bool[,] visited = new bool[image.Height, image.Width];
/*bool isSafe()
{
// row number is in range,
// column number is in range
// and value is 1 and not
// yet visited
pixelIndex = y2 * image.Width + x2;
return (y2 >= 0) && (y2 < image.Height) && (x2 >= 0) && (x2 < image.Width) && (bytes[pixelIndex] >= minPixel && !visited[y2, x2]);
}*/
void DFS(int y2, int x2)
{
Queue<System.Drawing.Point> queue = new Queue<System.Drawing.Point>();
queue.Enqueue(new System.Drawing.Point(x2, y2));
// Mark this cell as visited
visited[y2, x2] = true;
while (queue.Count > 0)
{
var point = queue.Dequeue();
y2 = point.Y;
x2 = point.X;
for (byte k = 0; k < 8; k++)
{
//if (isSafe(y2 + rowNbr[k], x2 + colNbr[k]))
var tempy2 = y2 + rowNbr[k];
var tempx2 = x2 + colNbr[k];
pixelIndex = tempy2 * image.Width + tempx2;
if (tempy2 >= 0 &&
tempy2 < image.Height &&
tempx2 >= 0 && tempx2 < image.Width &&
bytes[pixelIndex] >= minPixel &&
!visited[tempy2, tempx2])
{
visited[tempy2, tempx2] = true;
point = new Point(tempx2, tempy2);
pixels.Add(point);
queue.Enqueue(point);
islandSupportingPixels += previousBytes[pixelIndex] >= minPixelForSupportIsland ? 1u : 0;
/*if (!presetOnPrevious)
{
if (previousBytes[pixelIndex] >= minPixelForSupportIsland) presetOnPrevious = true;
}*/
}
}
}
}
// Initialize count as 0 and
// travese through the all
// cells of given matrix
//uint count = 0;
for (int y = 0; y < image.Height; ++y)
{
for (int x = 0; x < image.Width; ++x)
{
pixelIndex = y * image.Width + x;
if (bytes[pixelIndex] > minPixel && !visited[y, x])
{
// If a cell with value 1 is not
// visited yet, then new island
// found, Visit all cells in this
// island and increment island count
pixels.Clear();
pixels.Add(new Point(x, y));
islandSupportingPixels = previousBytes[pixelIndex] >= minPixelForSupportIsland ? 1u : 0;
DFS(y, x);
//count++;
if (islandSupportingPixels >= requiredPixelsToSupportIsland) continue; // Not a island, bounding is strong
if (islandSupportingPixels > 0 && pixels.Count < requiredPixelsToSupportIsland && islandSupportingPixels >= Math.Max(1, pixels.Count / 2)) continue; // Not a island
result.Add(new LayerIsland(this, pixels.ToArray()));
}
}
}
return result;
}
/// <summary>
/// Count the number of islands on this layer
/// </summary>
/// <returns>Number of islands</returns>
public uint CountIslands => (uint)GetIslandsLocation().Count;
public Layer Clone()
{
return new Layer(Index, RawData, Filename, ParentLayerManager);
}
#endregion
}
#endregion
#region LayerManager Class
public class LayerManager : IEnumerable<Layer>
{
#region Properties
/// <summary>
/// Layers List
/// </summary>
public Layer[] Layers { get; }
/// <summary>
/// Gets the layers count
/// </summary>
public uint Count => (uint) Layers.Length;
/// <summary>
/// Gets if any layer got modified, otherwise false
/// </summary>
public bool IsModified
{
get
{
for (uint i = 0; i < Count; i++)
{
if (Layers[i].IsModified) return true;
}
return false;
}
}
#endregion
#region Constructors
public LayerManager(uint layerCount)
{
Layers = new Layer[layerCount];
}
#endregion
#region Indexers
public Layer this[uint index]
{
get => Layers[index];
set => AddLayer(index, value);
}
public Layer this[int index]
{
get => Layers[index];
set => AddLayer((uint) index, value);
}
public Layer this[long index]
{
get => Layers[index];
set => AddLayer((uint) index, value);
}
#endregion
#region Numerators
public IEnumerator<Layer> GetEnumerator()
{
return ((IEnumerable<Layer>)Layers).GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
#endregion
#region Static Methods
/// <summary>
/// Compress a layer from a <see cref="Stream"/>
/// </summary>
/// <param name="input"><see cref="Stream"/> to compress</param>
/// <returns>Compressed byte array</returns>
public static byte[] CompressLayer(Stream input)
{
return CompressLayer(input.ToArray());
}
/// <summary>
/// Compress a layer from a byte array
/// </summary>
/// <param name="input">byte array to compress</param>
/// <returns>Compressed byte array</returns>
public static byte[] CompressLayer(byte[] input)
{
return input;
/*using (MemoryStream output = new MemoryStream())
{
using (DeflateStream dstream = new DeflateStream(output, CompressionLevel.Optimal))
{
dstream.Write(input, 0, input.Length);
}
return output.ToArray();
}*/
}
/// <summary>
/// Decompress a layer from a byte array
/// </summary>
/// <param name="input">byte array to decompress</param>
/// <returns>Decompressed byte array</returns>
public static byte[] DecompressLayer(byte[] input)
{
return input;
/*using (MemoryStream ms = new MemoryStream(input))
{
using (MemoryStream output = new MemoryStream())
{
using (DeflateStream dstream = new DeflateStream(ms, CompressionMode.Decompress))
{
dstream.CopyTo(output);
}
return output.ToArray();
}
}*/
}
#endregion
#region Methods
/// <summary>
/// Add a layer
/// </summary>
/// <param name="index">Layer index</param>
/// <param name="layer">Layer to add</param>
public void AddLayer(uint index, Layer layer)
{
Layers[index] = layer;
layer.ParentLayerManager = this;
}
/// <summary>
/// Get layer given index
/// </summary>
/// <param name="index">Layer index</param>
/// <returns></returns>
public Layer GetLayer(uint index)
{
return Layers[index];
}
public Dictionary<uint, List<LayerIsland>> GetAllIslands()
{
var result = new Dictionary<uint, List<LayerIsland>>((int) Count);
Parallel.ForEach(this, (layer) =>
{
result[layer.Index] = layer.GetIslandsLocation();
});
return result;
}
/// <summary>
/// Desmodify all layers
/// </summary>
public void Desmodify()
{
for (uint i = 0; i < Count; i++)
{
Layers[i].IsModified = false;
}
}
/// <summary>
/// Clone this object
/// </summary>
/// <returns></returns>
public LayerManager Clone()
{
LayerManager layerManager = new LayerManager(Count);
foreach (var layer in this)
{
layerManager[layer.Index] = layer.Clone();
}
return layerManager;
}
#endregion
}
#endregion
}
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