Tearing while 'windup' window moves

[DevonAA]

Not really an issue. More like FYI.

While the 'windup' window is moved with the mouse I get a lot of tearing. The painted image cuts off and is just white.

I've removed the WM_PAINT message handling and instead try to paint 'instantly'. That solved the tearing issue. Except if the window is moved into the screen from outside there is still a little bit - but that makes sense because it cannot capture from outside the screens size ahead of time.

I have no clue whether this is a proper fix. Nice demo project Ben :) Much faster capture than GDI and definitely better and easier than Microsoft docs.

case WM_TIMER:
	//if (dup.CaptureNext())
		//InvalidateRect(hWnd, nullptr, false);
	if (dup.CaptureNext())
	{
		InvalidateRect(hWnd, nullptr, false);
		PAINTSTRUCT ps;
		HDC         hdc = BeginPaint(hWnd, &ps);
		BITMAPINFO  inf;
		memset(&inf, 0, sizeof(inf));
		inf.bmiHeader.biSize        = sizeof(inf.bmiHeader);
		inf.bmiHeader.biWidth       = dup.Latest.Width;
		inf.bmiHeader.biHeight      = -dup.Latest.Height;
		inf.bmiHeader.biPlanes      = 1;
		inf.bmiHeader.biBitCount    = 32;
		inf.bmiHeader.biCompression = BI_RGB;
		void*   bits                = nullptr;
		HDC     srcDC               = CreateCompatibleDC(hdc);
		HBITMAP dib                 = CreateDIBSection(hdc, &inf, 0, &bits, nullptr, 0);
		memcpy(bits, dup.Latest.Buf.data(), dup.Latest.Width * dup.Latest.Height * 4);
		SelectObject(srcDC, dib);
		BitBlt(hdc, 0, 0, dup.Latest.Width, dup.Latest.Height, srcDC, 0, 0, SRCCOPY);
		DeleteObject(dib);
		DeleteObject(srcDC);
		EndPaint(hWnd, &ps);
	}
	break;
/*
case WM_PAINT:{
	PAINTSTRUCT ps;
	HDC         hdc = BeginPaint(hWnd, &ps);
	BITMAPINFO  inf;
	memset(&inf, 0, sizeof(inf));
	inf.bmiHeader.biSize        = sizeof(inf.bmiHeader);
	inf.bmiHeader.biWidth       = dup.Latest.Width;
	inf.bmiHeader.biHeight      = -dup.Latest.Height;
	inf.bmiHeader.biPlanes      = 1;
	inf.bmiHeader.biBitCount    = 32;
	inf.bmiHeader.biCompression = BI_RGB;
	void*   bits                = nullptr;
	HDC     srcDC               = CreateCompatibleDC(hdc);
	HBITMAP dib                 = CreateDIBSection(hdc, &inf, 0, &bits, nullptr, 0);
	memcpy(bits, dup.Latest.Buf.data(), dup.Latest.Width * dup.Latest.Height * 4);
	SelectObject(srcDC, dib);
	BitBlt(hdc, 0, 0, dup.Latest.Width, dup.Latest.Height, srcDC, 0, 0, SRCCOPY);
	DeleteObject(dib);
	DeleteObject(srcDC);
	EndPaint(hWnd, &ps);
} break;
*/