Filesystem.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Aiv.Draw;

namespace Filesystem1B
{
    class Program
    {
        static void PutPixel(Window window, int x, int y, byte r, byte g, byte b, byte a)
        {
            if (x < 0 || x >= window.width || y < 0 || y >= window.height)
            {
                return;
            }

            // converto to 0..1 domain
            float alpha = a / 255.0f;
            float invAlpha = 1 - alpha;

            int index = (y * window.width + x) * 3;

            // alpha blending
            window.bitmap[index] = (byte)((r * alpha) + (window.bitmap[index] * invAlpha));
            window.bitmap[index + 1] = (byte)((g * alpha) + (window.bitmap[index + 1] * invAlpha));
            window.bitmap[index + 2] = (byte)((b * alpha) + (window.bitmap[index + 2] * invAlpha));
        }

        static void ClearScreen(Window window)
        {
            for (int i = 0; i < window.bitmap.Length; i++)
            {
                window.bitmap[i] = 0;
            }
        }

        static void DrawSprite(Window window, Sprite sprite, int x, int y)
        {
            for (int spriteY = 0; spriteY < sprite.height; spriteY++)
            {
                for (int spriteX = 0; spriteX < sprite.width; spriteX++)
                {
                    int index = (spriteY * sprite.width + spriteX) * 4;
                    byte r = sprite.bitmap[index];
                    byte g = sprite.bitmap[index + 1];
                    byte b = sprite.bitmap[index + 2];
                    byte a = sprite.bitmap[index + 3];
                    PutPixel(window, x + spriteX, y + spriteY, r, g, b, a);
                }
            }
        }

        static void Main(string[] args)
        {
            Window window = new Window(1024, 768, "Sprite", PixelFormat.RGB);

            Sprite sprite001 = new Sprite("C:/Users/rober/Desktop/spyke_green.png");
            Sprite sprite002 = new Sprite("C:/Users/rober/Desktop/Spaceship-Transparent-PNG.png");

            DrawSprite(window, sprite001, 150, 150);
            DrawSprite(window, sprite002, 100, 100);
            

            while (window.opened)
            {
                window.Blit();
            }
        }
    }
}