screenshoting

bool update(std::vector<std::vector<col>> &pix)
{
    uint h = pix.size(), w = pix.front().size();

    HDC hdcSource = GetDC(NULL);
    HDC hdcMemory = CreateCompatibleDC(hdcSource);

    HBITMAP hBitmap = CreateCompatibleBitmap(hdcSource, w, h);
    SelectObject(hdcMemory, hBitmap);

    BitBlt(hdcMemory, 0, 0, w, h, hdcSource, sc.lCor.x, sc.lCor.y, SRCCOPY);

    BITMAPINFO bmpinfo = { 0 };
    bmpinfo.bmiHeader.biSize = sizeof(bmpinfo.bmiHeader);

    if (!GetDIBits(hdcMemory, hBitmap, 0, 0, NULL, &bmpinfo, DIB_RGB_COLORS))
    {
        return false;
    }

    BYTE *pixelMap = new BYTE[bmpinfo.bmiHeader.biSizeImage];

    bmpinfo.bmiHeader.biBitCount = 32;
    bmpinfo.bmiHeader.biCompression = BI_RGB;
    bmpinfo.bmiHeader.biHeight = -bmpinfo.bmiHeader.biHeight;

    if (!GetDIBits(hdcMemory, hBitmap, 0, h, pixelMap, &bmpinfo, DIB_RGB_COLORS))
    {
        return false;
    }

    ReleaseDC(NULL, hdcSource);
    DeleteDC(hdcMemory);
    DeleteObject(hBitmap);

    char* cPixel = (char*)pixelMap;

    for (uint y = 0; y < h; y++)
    {
        for (uint x = 0; x < w; x++)
        {
            pix[y][x] = col(cPixel[2] & 0xFF, cPixel[1] & 0xFF, cPixel[0] & 0xFF);
            cPixel += 4;
        }
    }

    delete[] pixelMap;

    return true;
}