src/dfb/dcclient.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/dfb/dcclient.cpp
   3 // Purpose:     wxWindowDC, wxClientDC and wxPaintDC
   4 // Author:      Vaclav Slavik
   5 // Created:     2006-08-10
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2006 REA Elektronik GmbH
   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 #include "wx/dcclient.h"
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/window.h"
  30 #endif
  31
  32 #include "wx/dfb/private.h"
  33
  34 #define TRACE_PAINT  _T("paint")
  35
  36 // ===========================================================================
  37 // implementation
  38 // ===========================================================================
  39
  40 //-----------------------------------------------------------------------------
  41 // wxWindowDC
  42 //-----------------------------------------------------------------------------
  43
  44 IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
  45
  46 wxWindowDC::wxWindowDC(wxWindow *win)
  47 {
  48     InitForWin(win, NULL);
  49 }
  50
  51 void wxWindowDC::InitForWin(wxWindow *win, const wxRect *rect)
  52 {
  53     m_win = win;
  54
  55     wxCHECK_RET( win, _T("invalid window") );
  56
  57     // obtain the surface used for painting:
  58     wxPoint origin;
  59     wxIDirectFBSurfacePtr surface;
  60
  61     if ( !win->IsShownOnScreen() )
  62     {
  63         // we're painting on invisible window: the changes won't have any
  64         // effect, as the window will be repainted anyhow when it is shown, but
  65         // we still need a valid DC so that e.g. text extents can be measured,
  66         // so let's create a dummy surface that has the same format as the real
  67         // one would have and let the code paint on it:
  68         wxLogTrace(TRACE_PAINT, _T("%p ('%s'): creating dummy DC surface"),
  69                    win, win->GetName().c_str());
  70         wxSize size(rect ? rect->GetSize() : win->GetSize());
  71         surface = win->GetDfbSurface()->CreateCompatible(size);
  72     }
  73     else
  74     {
  75         wxRect rectOrig(rect ? *rect : wxRect(win->GetSize()));
  76
  77         // compute painting rectangle after clipping if we're in PaintWindow
  78         // code, otherwise paint on the entire window:
  79         wxRect r(rectOrig);
  80         if ( win->GetTLW()->IsPainting() )
  81             r.Intersect(win->GetUpdateRegion().AsRect());
  82
  83         wxCHECK_RET( !r.IsEmpty(), _T("invalid painting rectangle") );
  84
  85         // if the DC was clipped thanks to rectPaint, we must adjust the origin
  86         // accordingly; but we do *not* adjust for 'rect', because
  87         // rect.GetPosition() has coordinates (0,0) in the DC:
  88         origin.x = rectOrig.x - r.x;
  89         origin.y = rectOrig.y - r.y;
  90
  91         wxLogTrace(TRACE_PAINT,
  92                    _T("%p ('%s'): creating DC for area [%i,%i,%i,%i], clipped to [%i,%i,%i,%i], origin [%i,%i]"),
  93                    win, win->GetName().c_str(),
  94                    rectOrig.x, rectOrig.y, rectOrig.GetRight(), rectOrig.GetBottom(),
  95                    r.x, r.y, r.GetRight(), r.GetBottom(),
  96                    origin.x, origin.y);
  97
  98         DFBRectangle dfbrect = { r.x, r.y, r.width, r.height };
  99         surface = win->GetDfbSurface()->GetSubSurface(&dfbrect);
 100     }
 101
 102     if ( !surface )
 103         return;
 104
 105     Init(surface);
 106     SetFont(win->GetFont());
 107
 108     // offset coordinates to account for subsurface's origin coordinates:
 109     SetDeviceOrigin(origin.x, origin.y);
 110 }
 111
 112 wxWindowDC::~wxWindowDC()
 113 {
 114     wxIDirectFBSurfacePtr surface(GetDirectFBSurface());
 115     if ( !surface || !m_win )
 116         return;
 117
 118     // painting on hidden window has no effect on TLW's surface, don't
 119     // waste time flipping the dummy surface:
 120     if ( !m_win->IsShownOnScreen() )
 121         return;
 122
 123     // if no painting was done on the DC, we don't have to flip the surface:
 124     if ( !m_isBBoxValid )
 125         return;
 126
 127     if ( !m_win->GetTLW()->IsPainting() )
 128     {
 129         // FIXME: flip only modified parts of the surface
 130         surface->FlipToFront();
 131     }
 132     // else: don't flip the surface, wxTLW will do it when it finishes
 133     //       painting of its invalidated areas
 134 }
 135
 136 //-----------------------------------------------------------------------------
 137 // wxClientDC
 138 //-----------------------------------------------------------------------------
 139
 140 IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)
 141
 142 wxClientDC::wxClientDC(wxWindow *win)
 143 {
 144     wxCHECK_RET( win, _T("invalid window") );
 145
 146     wxRect rect = win->GetClientRect();
 147     InitForWin(win, &rect);
 148 }
 149
 150 //-----------------------------------------------------------------------------
 151 // wxPaintDC
 152 //-----------------------------------------------------------------------------
 153
 154 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxWindowDC)