// WL-816n — 비교 캡처 합성: ⓐ 데모 | 섬 전 | 섬 후
public static class WL816n_Cmp
{
    public static void Run()
    {
        var demo = Load("Screenshots_WL/WL816f/c_demo_vs_island_ground.png");
        var bef = Load("Screenshots_WL/WL816n/a_before.png");
        var aft = Load("Screenshots_WL/WL816n/b_after.png");
        if (demo == null || bef == null || aft == null) { UnityEngine.Debug.LogError("[816n] png 없음"); return; }
        // 데모 좌측 절반만 잘라 쓴다
        int dw = demo.width / 2 - 20, dh = demo.height - 60;
        var dcrop = Crop(demo, 10, 30, dw, dh);
        int H = 900;
        var a = Fit(dcrop, H); var b = Fit(bef, H); var c = Fit(aft, H);
        int W = a.width + b.width + c.width + 16;
        var outT = new UnityEngine.Texture2D(W, H, UnityEngine.TextureFormat.RGB24, false);
        var bg = new UnityEngine.Color32(24, 24, 24, 255);
        var fill = new UnityEngine.Color32[W * H];
        for (int i = 0; i < fill.Length; i++) fill[i] = bg;
        outT.SetPixels32(fill);
        Blit(outT, a, 0); Blit(outT, b, a.width + 8); Blit(outT, c, a.width + b.width + 16);
        outT.Apply();
        System.IO.File.WriteAllBytes("Screenshots_WL/WL816n/a_demo_vs_before_after.png", UnityEngine.ImageConversion.EncodeToPNG(outT));
        UnityEngine.Debug.Log("[816n] cmp written " + W + "x" + H);
    }
    static UnityEngine.Texture2D Load(string p)
    {
        if (!System.IO.File.Exists(p)) return null;
        var t = new UnityEngine.Texture2D(2, 2, UnityEngine.TextureFormat.RGB24, false);
        UnityEngine.ImageConversion.LoadImage(t, System.IO.File.ReadAllBytes(p));
        return t;
    }
    static UnityEngine.Texture2D Crop(UnityEngine.Texture2D s, int x, int y, int w, int h)
    {
        var t = new UnityEngine.Texture2D(w, h, UnityEngine.TextureFormat.RGB24, false);
        t.SetPixels(s.GetPixels(x, y, w, h)); t.Apply(); return t;
    }
    static UnityEngine.Texture2D Fit(UnityEngine.Texture2D s, int H)
    {
        int W = UnityEngine.Mathf.RoundToInt(s.width * (float)H / s.height);
        var t = new UnityEngine.Texture2D(W, H, UnityEngine.TextureFormat.RGB24, false);
        for (int y = 0; y < H; y++)
            for (int x = 0; x < W; x++)
                t.SetPixel(x, y, s.GetPixelBilinear((x + 0.5f) / W, (y + 0.5f) / H));
        t.Apply(); return t;
    }
    static void Blit(UnityEngine.Texture2D dst, UnityEngine.Texture2D src, int x0)
    {
        for (int y = 0; y < src.height && y < dst.height; y++)
            for (int x = 0; x < src.width && x0 + x < dst.width; x++)
                dst.SetPixel(x0 + x, y, src.GetPixel(x, y));
    }
}