Visual-C Win32 API Layered Window Flickering

Question

I've been fiddling around with custom windows using the windows API. As of such I have been working with Extended Layered Windows. I have the window drawn, and it works. However when resizing the window there is an odd flickering/glitching [(Screenshot) ][1]when the redraw/UpdateLayeredWindow (and UpdateLayeredWindowIndirect) method is called. Is there anything I'm doing wrong here?

void redrawBaseWindow(HWND window) {
    RECT rect;
    GetWindowRect(window, &rect);
    int elipseDiam = ((rect.right - rect.left)+(rect.bottom-rect.top))/2*0.025;
    HDC mainDC = GetDC(NULL);
    POINT destination = { rect.left,rect.top };
    POINT zero = destination;
    SIZE size = { rect.right - rect.left,rect.bottom - rect.top };
    BLENDFUNCTION bf;
    bf.BlendOp = AC_SRC_OVER;
    bf.BlendFlags = 0;
    bf.AlphaFormat = 0;
    bf.SourceConstantAlpha = 255;
    HBRUSH brush = CreateSolidBrush(RGB(255, 0, 100));
    HBRUSH oldbrush = SelectObject(mainDC, brush);
    HPEN pen = CreatePen(PS_NULL, 0, RGB(0, 0, 0));
    HPEN oldPen = SelectObject(mainDC, pen);
    HBITMAP bmp = CreateCompatibleBitmap(mainDC, size.cx,size.cy);
    HBITMAP oldBmp = SelectObject(mainDC, bmp);
    FillRect(mainDC, &rect, CreateSolidBrush(RGB(0, 0, 0)));
    Rectangle(mainDC, rect.left, rect.top + elipseDiam/2, rect.right, rect.bottom - elipseDiam/2);
    Rectangle(mainDC, rect.left + elipseDiam/2, rect.top, rect.right - elipseDiam/2, rect.bottom);
    UPDATELAYEREDWINDOWINFO updated = { sizeof(UPDATELAYEREDWINDOWINFO), NULL, &destination, &size, mainDC, &zero, RGB(0,0,0),&bf, ULW_COLORKEY, &rect};
    UpdateLayeredWindowIndirect(window, &updated);
    //BOOL error = UpdateLayeredWindow(window, NULL, &destination, &size, mainDC, &zero, RGB(0, 0, 0), &bf, ULW_COLORKEY);
    SelectObject(mainDC, oldbrush);
    SelectObject(mainDC, oldBmp);
    SelectObject(mainDC, oldPen);
    DeleteObject(brush);
    DeleteObject(bmp);
    DeleteObject(pen);
}

Just in case, the Window Message Proc.

long __stdcall WndProc(HWND window, unsigned int msg, WPARAM wp, LPARAM lp) {
    PAINTSTRUCT ps;
    HDC hdc;
    TCHAR greeting[] = "Hello, World!";
    RECT rect_window;
    GetWindowRect(window, &rect_window);
    switch (msg) {
    case WM_SYSKEYDOWN:
        MessageBeep(MB_ICONERROR);
    case WM_CREATE:
    break;
case WM_DESTROY:
    PostQuitMessage(0);
    break;
case WM_NCHITTEST:;
    int x = LOWORD(lp);
    int y = HIWORD(lp);
    if (x > rect_window.left && xrect_window.top && y < rect_window.top + 25)
        return HTCAPTION;
    if (x>=rect_window.left-3 && x<=rect_window.left+3) 
        return HTLEFT;
    if (x >= rect_window.right - 3 && x <= rect_window.right + 3)
        return HTRIGHT;
    if (y >= rect_window.top - 3 && y <= rect_window.top + 3)
        return HTTOP;
    if (y >= rect_window.bottom - 3 && y <= rect_window.bottom + 3)
        return HTBOTTOM;
    break;
case WM_LBUTTONDOWN:
    break;
case WM_SIZE:
    redrawBaseWindow(window);
    break;
case WM_PAINT:
    break;
}
return DefWindowProc(window, msg, wp, lp);
}

Edit: Gif of the glitch

Edit 2: Using CreateCompatibleDC value into UpdateLayeredWindow [Also not working]

void redrawBaseWindow(HWND window) {
    RECT rect;
    GetWindowRect(window, &rect);
    int elipseDiam = ((rect.right - rect.left)+(rect.bottom-rect.top))/2*0.025;
    HDC mainDC = GetDC(NULL);
    HDC memDC = CreateCompatibleDC(mainDC);
    POINT destination = { rect.left,rect.top };
    POINT zero = destination;
    SIZE size = { rect.right - rect.left,rect.bottom - rect.top };
    BLENDFUNCTION bf;
    bf.BlendOp = AC_SRC_OVER;
    bf.BlendFlags = 0;
    bf.AlphaFormat = 0;
    bf.SourceConstantAlpha = 255;
    HBRUSH brush = CreateSolidBrush(RGB(255, 0, 100));
    HBRUSH oldbrush = SelectObject(memDC, brush);
    HPEN pen = CreatePen(PS_NULL, 0, RGB(0, 0, 0));
    HPEN oldPen = SelectObject(memDC, pen);
    HBITMAP bmp = CreateCompatibleBitmap(memDC, size.cx,size.cy);
    HBITMAP oldBmp = SelectObject(memDC, bmp);
    FillRect(memDC, &rect, CreateSolidBrush(RGB(0, 0, 0)));
    Rectangle(memDC, rect.left, rect.top + elipseDiam/2, rect.right, rect.bottom - elipseDiam/2);
    Rectangle(memDC, rect.left + elipseDiam/2, rect.top, rect.right - elipseDiam/2, rect.bottom);
    Ellipse(memDC, rect.left + elipseDiam, rect.top + elipseDiam, rect.left, rect.top); //Top-Left
    Ellipse(memDC, rect.right - elipseDiam, rect.top, rect.right, rect.top + elipseDiam); //Top-Right
    Ellipse(memDC, rect.left, rect.bottom, rect.left + elipseDiam, rect.bottom - elipseDiam); //Bottom-Left
    Ellipse(memDC, rect.right - elipseDiam, rect.bottom, rect.right, rect.bottom - elipseDiam); //Bottom-Right
    UPDATELAYEREDWINDOWINFO updated = { sizeof(UPDATELAYEREDWINDOWINFO), NULL, &destination, &size, memDC, &zero, RGB(0,0,0),&bf, ULW_COLORKEY, &rect};
    UpdateLayeredWindowIndirect(window, &updated);
    //BOOL error = UpdateLayeredWindow(window, NULL, &destination, &size, mainDC, &zero, RGB(0, 0, 0), &bf, ULW_COLORKEY);
    SelectObject(memDC, oldbrush);
    SelectObject(memDC, oldBmp);
    SelectObject(memDC, oldPen);
    DeleteObject(brush);
    DeleteObject(bmp);
    DeleteObject(pen);
    ReleaseDC(NULL,mainDC);
    ReleaseDC(NULL,memDC);
}

Edit 3: DeleteDC on CreateCompatibleDC device, as well as creation of bitmap on screen DC rather than CompatibleDC

void redrawBaseWindow(HWND window) {
    RECT rect;
    GetWindowRect(window, &rect);
    int elipseDiam = ((rect.right - rect.left)+(rect.bottom-rect.top))/2*0.025;
    HDC mainDC = GetDC(NULL);
    HDC memDC = CreateCompatibleDC(mainDC);
    POINT destination = { rect.left,rect.top };
    POINT zero = destination;
    SIZE size = { rect.right - rect.left,rect.bottom - rect.top };
    BLENDFUNCTION bf;
    bf.BlendOp = AC_SRC_OVER;
    bf.BlendFlags = 0;
    bf.AlphaFormat = 0;
    bf.SourceConstantAlpha = 255;
    HBRUSH brush = CreateSolidBrush(RGB(255, 0, 100));
    HBRUSH oldbrush = SelectObject(memDC, brush);
    HPEN pen = CreatePen(PS_NULL, 0, RGB(0, 0, 0));
    HPEN oldPen = SelectObject(memDC, pen);
    HBITMAP bmp = CreateCompatibleBitmap(mainDC, size.cx,size.cy);
    HBITMAP oldBmp = SelectObject(memDC, bmp);
    FillRect(memDC, &rect, CreateSolidBrush(RGB(0, 0, 0)));
    Rectangle(memDC, rect.left, rect.top + elipseDiam/2, rect.right, rect.bottom - elipseDiam/2);
    Rectangle(memDC, rect.left + elipseDiam/2, rect.top, rect.right - elipseDiam/2, rect.bottom);
    Ellipse(memDC, rect.left + elipseDiam, rect.top + elipseDiam, rect.left, rect.top); //Top-Left
    Ellipse(memDC, rect.right - elipseDiam, rect.top, rect.right, rect.top + elipseDiam); //Top-Right
    Ellipse(memDC, rect.left, rect.bottom, rect.left + elipseDiam, rect.bottom - elipseDiam); //Bottom-Left
    Ellipse(memDC, rect.right - elipseDiam, rect.bottom, rect.right, rect.bottom - elipseDiam); //Bottom-Right
    UPDATELAYEREDWINDOWINFO updated = { sizeof(UPDATELAYEREDWINDOWINFO), NULL, &destination, &size, memDC, &zero, RGB(0,0,0),&bf, ULW_COLORKEY, &rect};
    UpdateLayeredWindowIndirect(window, &updated);
    //BOOL error = UpdateLayeredWindow(window, NULL, &destination, &size, mainDC, &zero, RGB(0, 0, 0), &bf, ULW_COLORKEY);
    SelectObject(memDC, oldbrush);
    SelectObject(memDC, oldBmp);
    SelectObject(memDC, oldPen);
    DeleteObject(brush);
    DeleteObject(bmp);
    DeleteObject(pen);
    DeleteDC(memDC);
    ReleaseDC(NULL,mainDC);
}

Original flickering fixed. Thanks [Jonathan Pottar] Another error has occurred however : This

Visual-C Win32 API Layered Window Flickering

Answers (1)

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