/// <summary>
/// Convert binary data into an image in 2BPP planar (Gameboy).
/// </summary>
/// <param name="stream">MemoryStream which contains data.</param>
/// <param name="parameters">Parameters for the image.</param>
/// <returns>Return the data converted into a SKBitmap.</returns>
public SKBitmap Convert(MemoryStream stream, IImagePattern parameters)
{
if (stream == null || parameters == null)
{
return(null);
}
SKBitmap bitmap = null;
using (var binaryReader = new BinaryReader(stream, Encoding.UTF8, true))
{
var imageInfo = new SKImageInfo(parameters.Width, parameters.Height, SKColorType.Rgba8888);
bitmap = new SKBitmap(imageInfo);
int tileHeight = parameters.TilePattern.Height;
int tileWidth = parameters.TilePattern.Width;
int numberOfRowsOfTiles = parameters.Height / tileHeight;
int numberOfColsOfTiles = parameters.Width / tileWidth;
var pixels = bitmap.Pixels;
int numberOfTiles = numberOfRowsOfTiles * numberOfColsOfTiles;
int numberTotalOfBit = numberOfTiles * parameters.TilePattern.Size * 8;
var imageBits = new BitList(numberTotalOfBit, false);
var imageTiles = new BitList();
for (int i = 0; i < numberOfTiles; i++)
{
var tileBytes = binaryReader.ReadBytes(parameters.TilePattern.Size);
var tileBits = new BitList(tileBytes);
var tile = tileBits.RearrangeBitsWith2Planes(parameters.TilePattern);
imageTiles.AddBitList(tile);
}
int index = 0;
for (var row = 0; row < numberOfRowsOfTiles; row++)
{
for (var column = 0; column < numberOfColsOfTiles; column++)
{
for (var height = 0; height < tileHeight; height++)
{
for (var width = 0; width < tileWidth; width++)
{
var bitColor = System.Convert.ToInt32(imageTiles.GetBinaryString(index++) + imageTiles.GetBinaryString(index++), 2);
SKColor color;
if (parameters.Palette.Count > 0)
{
color = parameters.Palette[bitColor];
}
else
{
color = this.defaultPalette[bitColor];
}
pixels[(height * parameters.Width) + width + (column * tileWidth) + (row * tileHeight * parameters.Width)] = color;
}
}
}
}
bitmap.Pixels = pixels;
}
return(bitmap);
}
