Is there a scaling support for cursors

Question

Is there a scaling support for cursors

Igor Korot 56

Hi, All,If I create a cursor from resource, will it be properly scaled if I move my window to a monitor with the different scaling?Or I will have to create multiple icons and switch cursors based on dpi change message?Please advice Thank you.

Junjie Zhu - MSFT 21,646 Reputation points Microsoft External Staff

2023-04-18T10:06:25.37+00:00

Hi @Igor Korot , Has your problem been solved with the help of Castorix31？

1 answer

Your answer

Junjie Zhu - MSFT 21,646 Reputation points Microsoft External Staff

2023-04-18T10:06:25.37+00:00

Hi @Igor Korot , Has your problem been solved with the help of Castorix31？

Answer 1

Castorix31 90,191

Before, cursors were limited to 32x32

But now you can add several formats inside the .cur (32x32, 48x48... 128x128...), like Aero cursors in C:\Windows\Cursors, which will be chosen according to DPI scale or when cursor size is changed (HKEY_CURRENT_USER\SOFTWARE\Microsoft\Accessibility CursorSize or HKEY_CURRENT_USER\Control Panel\Cursors CursorBaseSize)

There is also a recent API : SetThreadCursorCreationScaling but I cannot test it (for OS >= Windows 11 21H2)

Igor Korot 56 Reputation points

2023-04-10T14:59:37.9733333+00:00

@Castorix31 , Is it going to be automatic? What I mean is - if I add the different sizes of cursor and then move my application onto the monitor with different DPI, will Windows automatically switch the cursor or I will need to do something? Also - what this function should do? Will it do the cursor scaling for me? Or I will have to do it manually. And probably one last question - if I create my cursor from the SVG and don't use the new API, will it be scaled by itself? What if I use that new function? Thank you.
Castorix31 90,191 Reputation points

2023-04-10T17:41:03.8733333+00:00

I have only 1 monitor, so I can only test with my monitor by changing cursor size/DPI scale in Windows Settings

The right cursor is automatically loaded according to cursor size/DPI scale (WM_SETTINGCHANGE/WM_DPICHANGED must be intercepted to reload the cursor)

(I tested with a .cur with several sizes, by drawing "48" in 48*48 size, "64" in 64x64 size, etc...)

And as I said, I cannot test the new API because I'm on Windows 10 (22H2), not Windows 11
Igor Korot 56 Reputation points

2023-04-10T18:04:44+00:00

@Castorix31 , Could you post the code you tested with? What did you put inside the handler? Thank you.

Castorix31 90,191

It is a quick test with WM_SETTINGCHANGE and a .cur file : (WM_DPICHANGED should be added with a Manifest)

case WM_SETTINGCHANGE:
	{
		if (wParam == SPI_SETLOGICALDPIOVERRIDE || wParam == 0x2029)
		{
			if (hCursor)
			{
				DestroyCursor(hCursor);
				hCursor = (HCURSOR)LoadImage(NULL, TEXT("E:\\Sources\\Test7\\arrowupdated.cur"), IMAGE_CURSOR, 0, 0, LR_DEFAULTSIZE |LR_DEFAULTCOLOR | LR_LOADFROMFILE);
				//Beep(6000, 10);
			}
		}
	}
	break;
	case WM_SETCURSOR:
	{
		if (hCursor == NULL)
		{
			hCursor = (HCURSOR)LoadImage(NULL, TEXT("E:\\Sources\\Test7\\arrowupdated.cur"), IMAGE_CURSOR, 0, 0, LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_LOADFROMFILE);
		}
		if (LOWORD(lParam) == HTCLIENT)
		{
			SetCursor(hCursor);
			return TRUE;
		}
		else
			return DefWindowProc(hWnd, message, wParam, lParam);
	}
	break;

Share via

Is there a scaling support for cursors

1 answer

Your answer