GFX_NULL

Using the `GFX_NULL` driver in Windows
The client area of the window is updated using GfxLib. Menus, toolbars or dialogs can be added to the window using normal Win API calls.
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'' Example of use of the GFX_NULL driver in windows
'' The GfxLib is set up in the ON_Create sub
'' The GFXLib buffer is drawn to screen in th On_Paint Sub
'' The GfXLib is updated in the event loop
#include "fbgfx.bi"
#include Once "windows.bi"
Using fb
Dim Shared bmi As bitmapv4header
Dim Shared mywin As rect
''
''--------------------------------------------------------------------------
Function on_paint(ByVal hwnd As HWND,ByVal wparam As WPARAM,ByVal lparam As LPARAM) As Integer
Dim rct As RECT
Dim pnt As PAINTSTRUCT
Dim hDC As HDC
'draw the gfx buffer to screen
hDC = BeginPaint(hWnd, @pnt)
GetClientRect( hWnd, @rct )
With rct
StretchDIBits hDC, 0, 0,.Right-.Left+1,.bottom-.top+1, 0, 0, .Right-.Left+1,_
.bottom-.top+1,ScreenPtr,CPtr(bitmapinfo Ptr, @bmi), DIB_RGB_COLORS, SRCCOPY
End With
EndPaint hWnd, @pnt
Function = 0
End Function
''
''---------------------------------------------------------------------------
Function on_Create(ByVal hwnd As HWND,ByVal wparam As WPARAM,ByVal lparam As LPARAM) As Integer
Dim rct As RECT
'set a gfxscreen of the size of the client area
GetClientRect( hWnd, @mywin)
ScreenRes mywin.right+1,mywin.bottom+1, 32, 1, GFX_NULL
'and create a bmp header,required to paint it yo screen
With bmi
.bV4Size = Len(BITMAPV4HEADER)
.bv4width=mywin.right+1
.bv4height=-(mywin.bottom+1) 'negative value=>top to bottom bmp
'(standard BMP's are bottom to top)
.bv4planes= 1
.bv4bitcount=32
.bv4v4compression=0
.bv4sizeimage=mywin.right+1*mywin.bottom+1*4
.bV4RedMask = &h0F00
.bV4GreenMask = &h00F0
.bV4BlueMask = &h000F
.bV4AlphaMask = &hF000
End With
Function = 0
End Function
''
''---------------------------------------------------------------------------
Function on_Destroy(ByVal hwnd As HWND,ByVal wparam As WPARAM,ByVal lparam As LPARAM) As Integer
'clear arrays....
PostQuitMessage( 0 )
Function = 0
End Function
''
''----------------------------------------------------------------------------
Function WndProc ( ByVal hWnd As HWND,ByVal message As UINT, _
ByVal wParam As WPARAM,ByVal lParam As LPARAM ) As LRESULT
Function = 0
Select Case As Const message
Case WM_CREATE
Function = On_create(hwnd,wparam,lparam)
Case WM_PAINT
Function = On_paint(hwnd,wparam,lparam)
Case WM_DESTROY
Function = On_destroy(hwnd,wparam,lparam)
Case Else
Function = DefWindowProc( hWnd, message, wParam, lParam )
End Select
End Function
''
''------------------------------------------------------------------------------
''main program create window + event loop
Dim wMsg As MSG
Dim wcls As WNDCLASS
Dim szAppName As ZString * 30 => "Random Rectangles"
Dim hWnd As HWND
Dim i As Integer
With wcls
.style = CS_HREDRAW Or CS_VREDRAW
.lpfnWndProc = @WndProc
.cbClsExtra = 0
.cbWndExtra = 0
.hInstance = GetModuleHandle( null )
.hIcon = LoadIcon( NULL, IDI_APPLICATION )
.hCursor = LoadCursor( NULL, IDC_ARROW )
.hbrBackground = GetStockObject(WHITE_BRUSH )
.lpszMenuName = NULL
.lpszClassName = @szAppName
End With
If( RegisterClass( @wcls ) = False ) Then
End
End If
'make a non-resizable screen
hWnd = CreateWindowEx( 0,szAppName,"Example of GFX_NULL",_
WS_OVERLAPPEDWINDOW And Not (WS_sizebox Or ws_maximizebox),_
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT, CW_USEDEFAULT, _
NULL,NULL, wcls.hinstance,NULL )
ShowWindow( hWnd, SW_NORMAL )
UpdateWindow( hWnd )
While 1
If PeekMessage( @wMsg, NULL, 0,0, PM_Remove) Then
If wmsg.message=WM_QUIT Then
Exit While
End If
TranslateMessage( @wMsg )
DispatchMessage( @wMsg )
Else
'update the gfx buffer
Line (Rnd*mywin.right,Rnd*mywin.bottom)-(Rnd*mywin.right,Rnd*mywin.bottom),_
RGB(Rnd*255,Rnd*255,Rnd*255),bf
redrawwindow (hwnd,0,0,rdw_invalidate)
End If
Wend
End wMsg.wparam
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