RecreateBuffer

gistfile1.asm

RecreateBackBuffer PROC hWin:DWORD

        ; make sure we've destroyed anything already setup
	invoke DestroyBackBuffer, hWin

        ; get an updated reading on the window's area
	invoke GetClientRect, hWin, ADDR clientRect

        ; acquire a new DC for the window	
	invoke GetDC, hWin
	mov winDC, eax

        ; create a new memory DC based off the window DC
	invoke CreateCompatibleDC, winDC
	mov memDC, eax

        ; make eax,ebx the width,height pair
	mov eax, clientRect.right
	sub eax, clientRect.left

	mov ebx, clientRect.bottom
	sub ebx, clientRect.top

        ; create our off-screen drawing surface
	invoke CreateCompatibleBitmap, winDC, eax, ebx
	mov memBitmap, eax

        ; this is where we'll draw to from here on
	invoke SelectObject, memDC, memBitmap
	mov memOldBitmap, eax

	xor eax, eax
	ret

RecreateBackBuffer ENDP