private PngChunk GenerateIhdrChunk(Image.Image image)
{
PngChunk chunk = new PngChunk();
chunk.PngChunkType = PngChunkType.IHDR;
chunk.ChunkBody = new byte[13];
byte[] widthBytes = BitConverter.GetBytes(image.Width);
byte[] heightBytes = BitConverter.GetBytes(image.Height);
chunk.ChunkBody[0] = widthBytes[3];
chunk.ChunkBody[1] = widthBytes[2];
chunk.ChunkBody[2] = widthBytes[1];
chunk.ChunkBody[3] = widthBytes[0];
chunk.ChunkBody[4] = heightBytes[3];
chunk.ChunkBody[5] = heightBytes[2];
chunk.ChunkBody[6] = heightBytes[1];
chunk.ChunkBody[7] = heightBytes[0];
chunk.ChunkBody[8] = 8;
chunk.ChunkBody[9] = 2;
chunk.ChunkBody[10] = 0;
chunk.ChunkBody[11] = 0;
chunk.ChunkBody[12] = 0;
return(chunk);
}
public void WriteImage(Image.Image format, string path = "test.ppm")
{
var width = format.Width;
var height = format.Height;
var bytes = new byte[width * height * 3];
var bytePos = 0;
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++, bytePos += 3)
{
var _pixel = format.Pixels[row][col];
if (_pixel is null)
{
continue;
}
bytes[bytePos] = (byte)_pixel.Red;
bytes[bytePos + 1] = (byte)_pixel.Green;
bytes[bytePos + 2] = (byte)_pixel.Blue;
}
}
File.WriteAllText(path, $"P6\n{width} {height}\n255\n");
using var stream = new FileStream(path, FileMode.Append);
stream.Write(bytes, 0, bytes.Length);
}
private PngChunk GenerateIdatChunk(Image.Image image)
{
PngChunk chunk = new PngChunk();
chunk.PngChunkType = PngChunkType.IDAT;
chunk.ChunkBody = Compressing(Filtering(image));
return(chunk);
}
public void WriteImage(Image.Image image, String path)
{
byte[] widthBytes = BitConverter.GetBytes(image.Width);
byte[] heightBytes = BitConverter.GetBytes(image.Height);
byte[] imageSizeBytes = BitConverter.GetBytes(image.Width * image.Height * 4);
byte[] fileSizeBytes = BitConverter.GetBytes(HeaderSize + HeaderInfoSize + (image.Width * image.Height * 4));
byte[] pixelDataOffsetBytes = BitConverter.GetBytes(HeaderSize + HeaderInfoSize);
byte[] imageBytes = new byte[HeaderSize + HeaderInfoSize + (image.Width * image.Height * 4)];
imageBytes[0] = 66;
imageBytes[1] = 77;
imageBytes[26] = 1;
imageBytes[28] = 32;
for (int i = 0; i < fileSizeBytes.Length; i++)
{
imageBytes[i + 2] = fileSizeBytes[i];
}
for (int i = 0; i < pixelDataOffsetBytes.Length; i++)
{
imageBytes[i + 10] = pixelDataOffsetBytes[i];
}
for (int i = 0; i < HeaderSizeBytse.Length; i++)
{
imageBytes[i + 14] = HeaderSizeBytse[i];
}
for (int i = 0; i < widthBytes.Length; i++)
{
imageBytes[i + 18] = widthBytes[i];
}
for (int i = 0; i < heightBytes.Length; i++)
{
imageBytes[i + 22] = heightBytes[i];
}
for (int i = 0; i < imageSizeBytes.Length; i++)
{
imageBytes[i + 34] = imageSizeBytes[i];
}
for (int i = 0; i < image.Pixels.Length; i++)
{
int reversedI = image.Height - 1 - i;
for (int l = 0; l < image.Pixels[i].Length; l++)
{
imageBytes[i * image.Width * 4 + HeaderSize + HeaderInfoSize + l * 4] = image.Pixels[reversedI][l].Blue;
imageBytes[i * image.Width * 4 + HeaderSize + HeaderInfoSize + l * 4 + 1] = image.Pixels[reversedI][l].Green;
imageBytes[i * image.Width * 4 + HeaderSize + HeaderInfoSize + l * 4 + 2] = image.Pixels[reversedI][l].Red;
imageBytes[i * image.Width * 4 + HeaderSize + HeaderInfoSize + l * 4 + 3] = 0;
}
}
File.WriteAllBytes(path, imageBytes);
}
private byte[] Filtering(Image.Image image)
{
byte[] filteredData = new byte[image.Height * ((image.Width * 3) + 1)];
int iteratorI = 0;
for (int i = 0; i < filteredData.Length;)
{
filteredData[i] = 0;
i++;
for (int l = 0; l < image.Width; l++)
{
filteredData[i + l * 3] = image.Pixels[iteratorI][l].Red;
filteredData[i + l * 3 + 1] = image.Pixels[iteratorI][l].Green;
filteredData[i + l * 3 + 2] = image.Pixels[iteratorI][l].Blue;
}
iteratorI++;
i += image.Width * 3;
}
return(filteredData);
}
public Image.Image ReadImage(String fileName)
{
byte[] array = File.ReadAllBytes(fileName);
List <PngChunk> chunks = ReadChunks(array);
PngHeader header = GetPngHeader(chunks);
// Console.WriteLine(array.Length);
// Console.WriteLine(header);
// for (int i = 0; i < array.Length; i++)
// {
// Console.WriteLine("I: " + i + ", B: " + array[i] + ", C: " + (char) array[i]);
// // if (i > 50) break;
// }
byte[] decompressedData = Decompressing(GetCompressedDataFromAllIdatChunks(chunks));
byte[] unfilteredData = Unfiltering(decompressedData, header);
Image.Image image = new Image.Image(header.Width, header.Height, GetPixelMatrix(unfilteredData, header));
// image.PrintPixels();
return(image);
}
public Image.Image ReadImage(String fileName)
{
byte[] array = File.ReadAllBytes(fileName);
byte[] fileSizeBytes = { array[2], array[3], array[4], array[5] };
int fileSize = BitConverter.ToInt32(fileSizeBytes, 0);
byte[] sizeHeaderBytes = { array[14], array[15], array[16], array[17] };
int headerSize = BitConverter.ToInt32(sizeHeaderBytes, 0);
byte[] widthBytes = { array[18], array[19], array[20], array[21] };
int width = BitConverter.ToInt32(widthBytes, 0);
byte[] heightBytes = { array[22], array[23], array[24], array[25] };
int height = BitConverter.ToInt32(heightBytes, 0);
byte[] imageSizeBytes = { array[34], array[35], array[36], array[37] };
int imageSize = BitConverter.ToInt32(imageSizeBytes, 0);
Image.Image image = new Image.Image();
image.Width = width;
image.Height = height;
Pixel[][] pixels = new Pixel[height][];
for (int i = 0; i < height; i++)
{
int rowStart = 14 + headerSize + (image.Height - 1 - i) * width * 4;
pixels[i] = new Pixel[width];
for (int l = 0; l < width; l++)
{
pixels[i][l] = new Pixel(array[rowStart + l * 4 + 2],
array[rowStart + l * 4 + 1],
array[rowStart + l * 4]);
}
}
image.Pixels = pixels;
return(image);
}
public void WriteImage(Image.Image image, String path)
{
PngChunk ihdr = GenerateIhdrChunk(image);
PngChunk idat = GenerateIdatChunk(image);
byte[] file = new byte[57 + idat.ChunkBody.Length];
file[0] = 137;
file[1] = 80;
file[2] = 78;
file[3] = 71;
file[4] = 13;
file[5] = 10;
file[6] = 26;
file[7] = 10;
file[8] = 0;
file[9] = 0;
file[10] = 0;
file[11] = 13;
file[12] = 73;
file[13] = 72;
file[14] = 68;
file[15] = 82;
for (int i = 0; i < ihdr.ChunkBody.Length; i++)
{
file[16 + i] = ihdr.ChunkBody[i];
}
file[29] = 141;
file[30] = 111;
file[31] = 38;
file[32] = 229;
byte[] idatSizeBytes = BitConverter.GetBytes(idat.ChunkBody.Length);
file[33] = idatSizeBytes[3];
file[34] = idatSizeBytes[2];
file[35] = idatSizeBytes[1];
file[36] = idatSizeBytes[0];
file[37] = 73;
file[38] = 68;
file[39] = 65;
file[40] = 84;
for (int i = 0; i < idat.ChunkBody.Length; i++)
{
file[41 + i] = idat.ChunkBody[i];
}
int iterator = 41 + idat.ChunkBody.Length;
file[iterator] = 45;
file[iterator + 1] = 27;
file[iterator + 2] = 23;
file[iterator + 3] = 249;
file[iterator + 4] = 0;
file[iterator + 5] = 0;
file[iterator + 6] = 0;
file[iterator + 7] = 0;
file[iterator + 8] = 73;
file[iterator + 9] = 69;
file[iterator + 10] = 78;
file[iterator + 11] = 68;
file[iterator + 12] = 174;
file[iterator + 13] = 66;
file[iterator + 14] = 96;
file[iterator + 15] = 130;
File.WriteAllBytes(path, file);
}
