FlipBackBuffer

gistfile1.asm

FlipBackBuffer PROC hWin:DWORD

	LOCAL hDC:HDC
	LOCAL ps:PAINTSTRUCT

        ; start painting the window
	invoke BeginPaint, hWin, ADDR ps
	mov hDC, eax

        ; work out the dimensions to blit
	mov eax, clientRect.right
	sub eax, clientRect.left

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

        ; write the memory buffer to the front buffer
	invoke BitBlt, hDC, 0, 0, eax, ebx, memDC, 0, 0, SRCCOPY

        ; we're done
	invoke EndPaint, hWin, ADDR ps

	xor eax, eax
	ret

FlipBackBuffer ENDP