IDirect3DDevice9Ex windowed mode resize without a reset

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I recently encountered an issue related to resizing internal DirectX9 overlay. Doing a full device reset on a window move or resize is too slow and did not seemed to be an appropriate way to do it.

The issue occurred when a target window was changed from windowed mode to borderless mode. The drawn lines did not shift according to the resolution.

I needed to find a solution on how to do DirectX9 window resize in runtime without device reset.

C++

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typedef struct
{
	IDirect3D9Ex* object;
	IDirect3DDevice9Ex* device;
	D3DPRESENT_PARAMETERS param;
	ID3DXFont* font;
	ID3DXFont* fontWarning;
	ID3DXLine* line;
} DX;

extern DX DX9;

The solution was to use the following D3DPRESENT PARAMETERS:

DX9.param.Windowed = true;	
	DX9.param.BackBufferFormat = D3DFMT_A8R8G8B8;	
	DX9.param.BackBufferWidth = 0;
	DX9.param.BackBufferHeight = 0;
	DX9.param.EnableAutoDepthStencil = true;
	DX9.param.AutoDepthStencilFormat = D3DFMT_D16;
	DX9.param.MultiSampleQuality = D3DMULTISAMPLE_NONE;
	DX9.param.SwapEffect = D3DSWAPEFFECT_DISCARD;
	DX9.param.hDeviceWindow = overlay.hwnd;
	DX9.param.FullScreen_RefreshRateInHz = 0;
	DX9.param.PresentationInterval = D3DPRESENT_INTERVAL_DEFAULT;
	DX9.param.Flags = 0;

The most important part:

DX9.device->BeginScene();
// Render your ESP whatever here ...
DX9.device->EndScene();

RECT rect = { 0, 0, overlay.width, overlay.height };			
	DX9.device->PresentEx(&rect, &rect, overlay.hwnd, 0, 0);	

	DX9.device->Clear(0, 0, D3DCLEAR_TARGET, 0, 1.0f, 0);	

Resize works just fine if I start a process in borderless mode and switch back to windowed mode. Doing other way does not work unless I reset the device. If anyone knows a proper solution. Feel free to write a comment. Thanks.

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