/// <summary>
/// Initializes a new instance of the <see cref="Tileset"/> class from the specified source image.
/// </summary>
/// <param name="source">The source image.</param>
public Tileset(Bitmap source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (source.Width < 8 || source.Height < 8)
{
throw new ArgumentException("Image must be at least 8x8 pixels.", nameof(source));
}
// Create the tiles
var width = source.Width / 8;
var height = source.Height / 8;
Tiles = new TilesetEntry[width * height];
// Copy image data from source
using (var fb = DirectBitmap.FromImage(source))
{
// Create the palette
Palette = Palette.Create(source);
// Create the tiles
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
ref var tile = ref Tiles[x + y * width];
for (int j = 0; j < 8; j++)
{
for (int i = 0; i < 8; i++)
{
var color = Color.FromArgb(fb.Pixels[(x * 8 + i) + (y * 8 + j) * fb.Width]);
// Find the color index
var index = Palette.IndexOf(color);
if (index < 0)
{
throw new IndexOutOfRangeException();
}
// Copy to the tile
tile[i, j] = index;
}
}
}
}
}
public unsafe bool Equals(ref TilesetEntry other, bool flipX = false, bool flipY = false)
{
for (int srcY = 0; srcY < 8; srcY++)
{
for (int srcX = 0; srcX < 8; srcX++)
{
var dstX = flipX ? (7 - srcX) : srcX;
var dstY = flipY ? (7 - srcY) : srcY;
if (this[srcX, srcY] != other[dstX, dstY])
{
return(false);
}
}
}
return(true);
}