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 // RCS-ID:      $Id$
   7 // Copyright:   (c) wxWidgets team
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // For compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/window.h"
  28     #include "wx/dcclient.h"
  29 #endif
  30
  31 #include "wx/private/overlay.h"
  32 #include "wx/dfb/dcclient.h"
  33 #include "wx/dfb/private.h"
  34
  35 // ============================================================================
  36 // implementation
  37 // ============================================================================
  38
  39 // ----------------------------------------------------------------------------
  40 // wxOverlay
  41 // ----------------------------------------------------------------------------
  42
  43 wxOverlayImpl::wxOverlayImpl()
  44 {
  45     m_window = NULL;
  46     m_isEmpty = true;
  47 }
  48
  49 wxOverlayImpl::~wxOverlayImpl()
  50 {
  51     Reset();
  52 }
  53
  54 bool wxOverlayImpl::IsOk()
  55 {
  56     return m_window != NULL;
  57 }
  58
  59 void wxOverlayImpl::Init(wxDC *dc, int x, int y, int width, int height)
  60 {
  61     wxCHECK_RET( dc, "NULL dc pointer" );
  62     wxASSERT_MSG( !IsOk() , _("You cannot Init an overlay twice") );
  63
  64     wxDFBDCImpl * const dcimpl = wxDynamicCast(dc->GetImpl(), wxDFBDCImpl);
  65     wxCHECK_RET( dcimpl, "must have a DFB wxDC" );
  66
  67     m_window = dc->GetWindow();
  68
  69     m_rect = wxRect(x, y, width, height);
  70     if ( wxDynamicCast(dc, wxClientDC) )
  71         m_rect.Offset(m_window->GetClientAreaOrigin());
  72
  73     // FIXME: create surface with transparency or key color (?)
  74     m_surface = dcimpl->GetDirectFBSurface()->CreateCompatible
  75                 (
  76                    m_rect.GetSize(),
  77                    wxIDirectFBSurface::CreateCompatible_NoBackBuffer
  78                 );
  79
  80     m_window->AddOverlay(this);
  81 }
  82
  83 void wxOverlayImpl::BeginDrawing(wxDC *dc)
  84 {
  85     wxCHECK_RET( dc, "NULL dc pointer" );
  86
  87     wxWindowDCImpl * const
  88         dcimpl = static_cast<wxWindowDCImpl *>(dc->GetImpl());
  89
  90     wxPoint origin(m_rect.GetPosition());
  91     if ( wxDynamicCast(dc, wxClientDC) )
  92         origin -= m_window->GetClientAreaOrigin();
  93
  94     // drawing on overlay "hijacks" existing wxWindowDC rather then using
  95     // another DC, so we have to change the DC to draw on the overlay's surface.
  96     // Setting m_shouldFlip is done to avoid flipping and drawing of overlays
  97     // in ~wxWindowDC (we do it EndDrawing).
  98     dcimpl->DFBInit(m_surface);
  99     dcimpl->m_shouldFlip = false;
 100     dc->SetDeviceOrigin(-origin.x, -origin.y);
 101
 102     m_isEmpty = false;
 103 }
 104
 105 void wxOverlayImpl::EndDrawing(wxDC *WXUNUSED(dc))
 106 {
 107     m_window->RefreshWindowRect(m_rect);
 108 }
 109
 110 void wxOverlayImpl::Clear(wxDC *WXUNUSED(dc))
 111 {
 112     wxASSERT_MSG( IsOk(),
 113                   "You cannot Clear an overlay that is not initialized" );
 114
 115     m_isEmpty = true;
 116 }
 117
 118 void wxOverlayImpl::Reset()
 119 {
 120     if ( m_window )
 121     {
 122         m_window->RemoveOverlay(this);
 123         m_window = NULL;
 124         m_surface.Reset();
 125     }
 126 }