rgbquad.cpp

#include <windows.h>
static ULONGLONG n, r;
int randy() { return n = r, n ^= 0x8ebf635bee3c6d25, n ^= n << 5 | n >> 26, n *= 0xf3e05ca5c43e376b, r = n, n & 0x7fffffff; }

DWORD WINAPI rgb(LPVOID lpParam) {
    int time = GetTickCount();
    int w = GetSystemMetrics(0), h = GetSystemMetrics(1);
    RGBQUAD* data = (RGBQUAD*)VirtualAlloc(0, (w * h + w) * sizeof(RGBQUAD), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
    for (int i = 0;; i++, i %= 3) {
        HDC desk = GetDC(NULL);
        HDC hdcdc = CreateCompatibleDC(desk);
        HBITMAP hbm = CreateBitmap(w, h, 1, 32, data);
        SelectObject(hdcdc, hbm);
        BitBlt(hdcdc, 0, 0, w, h, desk, 0, 0, SRCCOPY);
        GetBitmapBits(hbm, w * h * 4, data);
        int v = 0;
        BYTE byte = 0;
        if ((GetTickCount() - time) > 60000)
            byte = randy()%0xff;
        for (int i = 0; w * h > i; i++) {
            if (i % h == 0 && randy() % 100 == 0)
                v = randy() % 50;
            ((BYTE*)(data + i))[v % 3] += ((BYTE*)(data + i + v))[v] ^ byte;
        }
        SetBitmapBits(hbm, w * h * 4, data);
        BitBlt(desk, 0, 0, w, h, hdcdc, 0, 0, SRCCOPY);
        DeleteObject(hbm);
        DeleteObject(hdcdc);
        DeleteObject(desk);
    }
    return 0;
} 

int main() {
    CreateThread(0, 0, rgb, 0, 0, 0);
    Sleep(-1);
}