DQMJ2P bmp

using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;

public class NCGRViewer : Form
{
    private PictureBox pictureBox;
    private Bitmap bitmap;
    private const int TILE_SIZE = 8;
    private const int TILES_PER_ROW = 5;
    private const int TILE_COUNT = 25;
    private const int IMAGE_SIZE = TILE_SIZE * TILES_PER_ROW;
    private Color[] palette = new Color[16];

    public NCGRViewer()
    {
        this.Text = "NCGR Viewer";
        this.ClientSize = new Size(IMAGE_SIZE, IMAGE_SIZE);

        pictureBox = new PictureBox
        {
            Dock = DockStyle.Fill,
            SizeMode = PictureBoxSizeMode.StretchImage
        };

        this.Controls.Add(pictureBox);
        LoadNCGR("test.bin");
    }

    private void LoadNCGR(string filePath)
    {
        byte[] data = File.ReadAllBytes(filePath);

        // パレットデコード
        for (int i = 0; i < 16; i++)
        {
            int offset = 0x350 + (i * 2);
            ushort colorData = BitConverter.ToUInt16(data, offset);
            int r = (colorData & 0x1F) * 8;
            int g = ((colorData >> 5) & 0x1F) * 8;
            int b = ((colorData >> 10) & 0x1F) * 8;
            palette[i] = Color.FromArgb(r, g, b);
        }

        // 画像データデコード
        bitmap = new Bitmap(IMAGE_SIZE, IMAGE_SIZE);

        for (int tile = 0; tile < TILE_COUNT; tile++)
        {
            int newTileIndex = tile;
            int tileX;
            int tileY;

            if (tile < 20)
            {
                newTileIndex = ((tile % 4) * 5) + (tile / 4);
                if (tile < 16)
                {
                    newTileIndex = ((tile / 4) * 5) + (tile % 4);
                }
            }

                tileX = (newTileIndex % TILES_PER_ROW) * TILE_SIZE;
                tileY = (newTileIndex / TILES_PER_ROW) * TILE_SIZE;


            int tileOffset = 0x30 + (tile * 32);

            for (int y = 0; y < TILE_SIZE; y++)
            {
                for (int x = 0; x < TILE_SIZE; x += 2)
                {
                    if (tileOffset + (y * 4) + (x / 2) >= data.Length)
                        continue; // 範囲外ならスキップ

                    byte pixelData = data[tileOffset + (y * 4) + (x / 2)];

                    byte index1 = (byte)(pixelData & 0x0F);        // 下位4bit 左のピクセル
                    byte index2 = (byte)((pixelData >> 4) & 0x0F); // 上位4bit 右のピクセル

                    bitmap.SetPixel(tileX + x, tileY + y, palette[index1]); // 1ピクセル目
                    bitmap.SetPixel(tileX + x + 1, tileY + y, palette[index2]); // 2ピクセル目
                }
            }
        }
        pictureBox.Image = bitmap;
    }

    [STAThread]
    public static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new NCGRViewer());
    }
}