for (var i = 0; i < 3; i++)
{
    var current_sprite = current_sprites[i];
    var resolution_factor = 1;
    if (ds_map_exists(global.firework_sprite_pixel_data, current_sprite))
        continue;
    var h_pixels = sprite_get_width(current_sprite) * resolution_factor;
    var v_pixels = sprite_get_height(current_sprite) * resolution_factor;
    var x_offset = sprite_get_xoffset(current_sprite) * resolution_factor;
    var y_offset = sprite_get_yoffset(current_sprite) * resolution_factor;
    var surf = surface_create(h_pixels, v_pixels);
    surface_set_target(surf);
    draw_clear_alpha(c_black, 0);
    draw_sprite_ext(current_sprite, 0, x_offset, y_offset, resolution_factor, resolution_factor, 0, c_white, 1);
    surface_reset_target();
    var pixels = 0;
    var pixelx = [];
    var pixely = [];
    var pixelrgb = [];
    var pixelalpha = [];
    for (var _x = 0; _x < h_pixels; _x++)
    {
        for (var _y = 0; _y < v_pixels; _y++)
        {
            var col = surface_getpixel_ext(surf, _x, _y);
            var _alpha = (col >> 24) & 255;
            if (_alpha == 0)
                continue;
            var _blue = (col >> 16) & 255;
            var _green = (col >> 8) & 255;
            var _red = col & 255;
            pixelrgb[pixels] = make_colour_rgb(_red, _green, _blue);
            pixelalpha[pixels] = _alpha;
            pixelx[pixels] = _x - x_offset;
            pixely[pixels] = _y - y_offset;
            pixels++;
        }
    }
    surface_free(surf);
    var width = h_pixels;
    var height = v_pixels;
    ds_map_add(global.firework_sprite_pixel_data, current_sprite, [pixels, pixelx, pixely, width, height, pixelrgb, pixelalpha]);
}