public void Write(Texture2D texture2D, Stream outputStream)
{
width = texture2D.Width;
height = texture2D.Height;
GetColorData(texture2D);
// write PNG signature
outputStream.Write(HeaderChunk.PngSignature, 0, HeaderChunk.PngSignature.Length);
// write header chunk
var headerChunk = new HeaderChunk();
headerChunk.Width = (uint)texture2D.Width;
headerChunk.Height = (uint)texture2D.Height;
headerChunk.BitDepth = 8;
headerChunk.ColorType = colorType;
headerChunk.CompressionMethod = 0;
headerChunk.FilterMethod = 0;
headerChunk.InterlaceMethod = 0;
var headerChunkBytes = headerChunk.Encode();
outputStream.Write(headerChunkBytes, 0, headerChunkBytes.Length);
// write data chunks
var encodedPixelData = EncodePixelData(texture2D);
var compressedPixelData = new MemoryStream();
ZlibStream deflateStream = null;
try
{
deflateStream = new ZlibStream(compressedPixelData, CompressionMode.Compress);
deflateStream.Write(encodedPixelData, 0, encodedPixelData.Length);
deflateStream.Finish();
}
catch (Exception exception)
{
throw new Exception("An error occurred during DEFLATE compression.", exception);
}
var dataChunk = new DataChunk();
dataChunk.Data = compressedPixelData.ToArray();
var dataChunkBytes = dataChunk.Encode();
outputStream.Write(dataChunkBytes, 0, dataChunkBytes.Length);
deflateStream.Dispose();
compressedPixelData.Dispose();
// write end chunk
var endChunk = new EndChunk();
var endChunkBytes = endChunk.Encode();
outputStream.Write(endChunkBytes, 0, endChunkBytes.Length);
}