using System;

using System.Collections.Generic;

using System.Drawing;

using System.Drawing.Imaging;

using System.Runtime.InteropServices;

using System.Text;

namespace Spectrogram

{

public static class Image

{

public static Bitmap Create(byte[,] pixelValues, int wrapIndex = 0)

{

int height = pixelValues.GetLength(1);

int width = pixelValues.GetLength(0);

Bitmap bmp = new Bitmap(width, height, PixelFormat.Format8bppIndexed);

var lockRect = new Rectangle(0, 0, width, height);

BitmapData bitmapData = bmp.LockBits(lockRect, ImageLockMode.ReadOnly, bmp.PixelFormat);

int stride = bitmapData.Stride;

byte[] bytes = new byte[bitmapData.Stride * height];

for (int col = 0; col < width; col++)

{

for (int row = 0; row < height; row++)

{

int bytePosition = (height - 1 - row) * stride + col;

bytes[bytePosition] = pixelValues[col, row];

}

}

Marshal.Copy(bytes, 0, bitmapData.Scan0, bytes.Length);

bmp.UnlockBits(bitmapData);

return bmp;

}

public static Bitmap CreateMax(byte[,] pixelValues, int wrapIndex = 0, int pxPerPx = 1)

{

int height = pixelValues.GetLength(1) / pxPerPx;

int width = pixelValues.GetLength(0);

Bitmap bmp = new Bitmap(width, height, PixelFormat.Format8bppIndexed);

var lockRect = new Rectangle(0, 0, width, height);

BitmapData bitmapData = bmp.LockBits(lockRect, ImageLockMode.ReadOnly, bmp.PixelFormat);

int stride = bitmapData.Stride;

byte[] bytes = new byte[bitmapData.Stride * height];

for (int col = 0; col < width; col++)

{

for (int row = 0; row < height; row++)

{

int bytePosition = (height - 1 - row) * stride + col;

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

bytes[bytePosition] = Math.Max(bytes[bytePosition], pixelValues[col, row * pxPerPx + i]);

}

}

Marshal.Copy(bytes, 0, bitmapData.Scan0, bytes.Length);

bmp.UnlockBits(bitmapData);

return bmp;

}

}

}