src/dfb/overlay.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/dfb/overlay.cpp
   3 // Purpose:     wxOverlay implementation for wxDFB
   4 // Author:      Vaclav Slavik
   5 // Created:     2006-10-20
   6 // Copyright:   (c) wxWidgets team
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // ============================================================================
  11 // declarations
  12 // ============================================================================
  13
  14 // ----------------------------------------------------------------------------
  15 // headers
  16 // ----------------------------------------------------------------------------
  17
  18 // For compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #ifdef __BORLANDC__
  22     #pragma hdrstop
  23 #endif
  24
  25 #ifndef WX_PRECOMP
  26     #include "wx/window.h"
  27     #include "wx/dcclient.h"
  28 #endif
  29
  30 #include "wx/private/overlay.h"
  31 #include "wx/dfb/dcclient.h"
  32 #include "wx/dfb/private.h"
  33
  34 // ============================================================================
  35 // implementation
  36 // ============================================================================
  37
  38 // ----------------------------------------------------------------------------
  39 // wxOverlay
  40 // ----------------------------------------------------------------------------
  41
  42 wxOverlayImpl::wxOverlayImpl()
  43 {
  44     m_window = NULL;
  45     m_isEmpty = true;
  46 }
  47
  48 wxOverlayImpl::~wxOverlayImpl()
  49 {
  50     Reset();
  51 }
  52
  53 bool wxOverlayImpl::IsOk()
  54 {
  55     return m_window != NULL;
  56 }
  57
  58 void wxOverlayImpl::Init(wxDC *dc, int x, int y, int width, int height)
  59 {
  60     wxCHECK_RET( dc, "NULL dc pointer" );
  61     wxASSERT_MSG( !IsOk() , _("You cannot Init an overlay twice") );
  62
  63     wxDFBDCImpl * const dcimpl = wxDynamicCast(dc->GetImpl(), wxDFBDCImpl);
  64     wxCHECK_RET( dcimpl, "must have a DFB wxDC" );
  65
  66     m_window = dc->GetWindow();
  67
  68     m_rect = wxRect(x, y, width, height);
  69     if ( wxDynamicCast(dc, wxClientDC) )
  70         m_rect.Offset(m_window->GetClientAreaOrigin());
  71
  72     // FIXME: create surface with transparency or key color (?)
  73     m_surface = dcimpl->GetDirectFBSurface()->CreateCompatible
  74                 (
  75                    m_rect.GetSize(),
  76                    wxIDirectFBSurface::CreateCompatible_NoBackBuffer
  77                 );
  78
  79     m_window->AddOverlay(this);
  80 }
  81
  82 void wxOverlayImpl::BeginDrawing(wxDC *dc)
  83 {
  84     wxCHECK_RET( dc, "NULL dc pointer" );
  85
  86     wxWindowDCImpl * const
  87         dcimpl = static_cast<wxWindowDCImpl *>(dc->GetImpl());
  88
  89     wxPoint origin(m_rect.GetPosition());
  90     if ( wxDynamicCast(dc, wxClientDC) )
  91         origin -= m_window->GetClientAreaOrigin();
  92
  93     // drawing on overlay "hijacks" existing wxWindowDC rather then using
  94     // another DC, so we have to change the DC to draw on the overlay's surface.
  95     // Setting m_shouldFlip is done to avoid flipping and drawing of overlays
  96     // in ~wxWindowDC (we do it EndDrawing).
  97     dcimpl->DFBInit(m_surface);
  98     dcimpl->m_shouldFlip = false;
  99     dc->SetDeviceOrigin(-origin.x, -origin.y);
 100
 101     m_isEmpty = false;
 102 }
 103
 104 void wxOverlayImpl::EndDrawing(wxDC *WXUNUSED(dc))
 105 {
 106     m_window->RefreshWindowRect(m_rect);
 107 }
 108
 109 void wxOverlayImpl::Clear(wxDC *WXUNUSED(dc))
 110 {
 111     wxASSERT_MSG( IsOk(),
 112                   "You cannot Clear an overlay that is not initialized" );
 113
 114     m_isEmpty = true;
 115 }
 116
 117 void wxOverlayImpl::Reset()
 118 {
 119     if ( m_window )
 120     {
 121         m_window->RemoveOverlay(this);
 122         m_window = NULL;
 123         m_surface.Reset();
 124     }
 125 }