Print Page - Is it possible to render a window to a bitmap without showing the window?

Title: Is it possible to render a window to a bitmap without showing the window?
Post by: xanatose on March 16, 2022, 06:38:43 AM

I basically need to render win32 controls on an OpenGL application. Letting windows handle the UI. (Specially the text input in other languages). While allowing transformation of the windows rectangles in 3d.

Title: Re: Is it possible to render a window to a bitmap without showing the window?
Post by: Greenhorn on March 16, 2022, 11:07:30 PM

Hi xanatose,

I have no idea what you try to do but anyways ...

Code Select


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
;    CreateBitmapFromCtrl
;
CreateBitmapFromCtrl proc hwndCtrl:HWND

LOCAL hdc:	HDC
LOCAL hbm:	HBITMAP
LOCAL hObjOld:	HGDIOBJ
LOCAL rc:		RECT

	invoke GetClientRect, hwndCtrl, addr rc
	
	invoke CreateCompatibleDC, 0
	
	.if (rax)
		mov  hdc, rax
	.else
		jmp  @F
	.endif
	
	invoke CreateCompatibleBitmap, hdc, rc.right, rc.bottom
	
	.if (rax)
		mov  hbm, rax
	.else
		invoke DeleteDC, hdc
		jmp  @F
	.endif
	
	invoke SelectObject, hdc, hbm
	
	mov  hObjOld, rax
	
	invoke SendMessage, hwndCtrl, WM_PRINTCLIENT, hdc, PRF_CLIENT
	
	invoke SelectObject, hdc, hObjOld
	invoke DeleteDC, hdc

	mov  rax, hbm
@@:
	ret
CreateBitmapFromCtrl endp

Kind Regards
Greenhorn

The MASM Forum

General => The Workshop => Topic started by: xanatose on March 16, 2022, 06:38:43 AM