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.

'' 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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