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 // helpers
  42 //-----------------------------------------------------------------------------
  43
  44 // Returns subrect of the window that is not outside of its parent's
  45 // boundaries ("hidden behind its borders"), recursively:
  46 static wxRect GetUncoveredWindowArea(wxWindow *win)
  47 {
  48     wxRect r(win->GetSize());
  49
  50     if ( win->IsTopLevel() )
  51         return r;
  52
  53     wxWindow *parent = win->GetParent();
  54     if ( !parent )
  55         return r;
  56
  57     // intersect with parent's uncovered area, after offsetting it into win's
  58     // coordinates; this will remove parts of 'r' that are outside of the
  59     // parent's area:
  60     wxRect rp(GetUncoveredWindowArea(parent));
  61     rp.Offset(-win->GetPosition());
  62     rp.Offset(-parent->GetClientAreaOrigin());
  63     r.Intersect(rp);
  64
  65     return r;
  66 }
  67
  68 // creates a dummy surface that has the same format as the real window's
  69 // surface, but is not visible and so can be painted on even if the window
  70 // is hidden
  71 static
  72 wxIDirectFBSurfacePtr CreateDummySurface(wxWindow *win, const wxRect *rect)
  73 {
  74     wxLogTrace(TRACE_PAINT, _T("%p ('%s'): creating dummy DC surface"),
  75                win, win->GetName().c_str());
  76     wxSize size(rect ? rect->GetSize() : win->GetSize());
  77     return win->GetDfbSurface()->CreateCompatible
  78            (
  79              size,
  80              wxIDirectFBSurface::CreateCompatible_NoBackBuffer
  81            );
  82 }
  83
  84 //-----------------------------------------------------------------------------
  85 // wxWindowDC
  86 //-----------------------------------------------------------------------------
  87
  88 IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
  89
  90 wxWindowDC::wxWindowDC(wxWindow *win)
  91 {
  92     InitForWin(win, NULL);
  93 }
  94
  95 void wxWindowDC::InitForWin(wxWindow *win, const wxRect *rect)
  96 {
  97     wxCHECK_RET( win, _T("invalid window") );
  98
  99     // obtain the surface used for painting:
 100     wxPoint origin;
 101     wxIDirectFBSurfacePtr surface;
 102
 103     wxRect rectOrig(rect ? *rect : wxRect(win->GetSize()));
 104     wxRect r;
 105
 106     if ( !win->IsShownOnScreen() )
 107     {
 108         // leave 'r' rectangle empty to indicate the window is not visible,
 109         // see below (below "create the surface:") for how is this case handled
 110     }
 111     else
 112     {
 113         // compute painting rectangle after clipping if we're in PaintWindow
 114         // code, otherwise paint on the entire window:
 115         r = rectOrig;
 116
 117         const wxRegion& updateRegion = win->GetUpdateRegion();
 118         if ( win->GetTLW()->IsPainting() && !updateRegion.IsEmpty() )
 119         {
 120             r.Intersect(updateRegion.AsRect());
 121             wxCHECK_RET( !r.IsEmpty(), _T("invalid painting rectangle") );
 122
 123             // parent TLW will flip the entire surface when painting is done
 124             m_shouldFlip = false;
 125         }
 126         else
 127         {
 128             // One of two things happened:
 129             // (1) the TLW is not being painted by PaintWindow() now; or
 130             // (2) we're drawing on some window other than the one that is
 131             //     currently painted on by PaintWindow()
 132             // In either case, we need to flip the surface when we're done
 133             // painting and we don't have to use updateRegion for clipping.
 134             // OTOH, if the window is (partially) hidden by being
 135             // out of its parent's area, we must clip the surface accordingly.
 136             r.Intersect(GetUncoveredWindowArea(win));
 137             m_shouldFlip = true; // paint the results immediately
 138         }
 139     }
 140
 141     // create the surface:
 142     if ( r.IsEmpty() )
 143     {
 144         // we're painting on invisible window: the changes won't have any
 145         // effect, as the window will be repainted anyhow when it is shown,
 146         // but we still need a valid DC so that e.g. text extents can be
 147         // measured, so let's create a dummy surface that has the same
 148         // format as the real one would have and let the code paint on it:
 149         surface = CreateDummySurface(win, rect);
 150
 151         // painting on hidden window has no effect on TLW's surface, don't
 152         // waste time flipping the dummy surface:
 153         m_shouldFlip = false;
 154     }
 155     else
 156     {
 157         DFBRectangle dfbrect = { r.x, r.y, r.width, r.height };
 158         surface = win->GetDfbSurface()->GetSubSurface(&dfbrect);
 159
 160         // if the DC was clipped thanks to rectPaint, we must adjust the
 161         // origin accordingly; but we do *not* adjust for 'rect', because
 162         // rect.GetPosition() has coordinates (0,0) in the DC:
 163         origin.x = rectOrig.x - r.x;
 164         origin.y = rectOrig.y - r.y;
 165
 166         // m_shouldFlip was set in the "if" block above this one
 167     }
 168
 169     if ( !surface )
 170         return;
 171
 172     wxLogTrace(TRACE_PAINT,
 173                _T("%p ('%s'): creating DC for area [%i,%i,%i,%i], clipped to [%i,%i,%i,%i], origin [%i,%i]"),
 174                win, win->GetName().c_str(),
 175                rectOrig.x, rectOrig.y, rectOrig.GetRight(), rectOrig.GetBottom(),
 176                r.x, r.y, r.GetRight(), r.GetBottom(),
 177                origin.x, origin.y);
 178
 179     Init(surface);
 180     SetFont(win->GetFont());
 181
 182     // offset coordinates to account for subsurface's origin coordinates:
 183     SetDeviceOrigin(origin.x, origin.y);
 184 }
 185
 186 wxWindowDC::~wxWindowDC()
 187 {
 188     wxIDirectFBSurfacePtr surface(GetDirectFBSurface());
 189     if ( !surface )
 190         return;
 191
 192     // if no painting was done on the DC, we don't have to flip the surface:
 193     if ( !m_isBBoxValid )
 194         return;
 195
 196     if ( m_shouldFlip )
 197     {
 198         DFBSurfaceCapabilities caps = DSCAPS_NONE;
 199         surface->GetCapabilities(&caps);
 200         if ( caps & DSCAPS_DOUBLE )
 201         {
 202             // FIXME: flip only modified parts of the surface
 203             surface->FlipToFront();
 204         }
 205         // else: the surface is not double-buffered and so cannot be flipped
 206     }
 207     // else: don't flip the surface, wxTLW will do it when it finishes
 208     //       painting of its invalidated areas
 209 }
 210
 211 //-----------------------------------------------------------------------------
 212 // wxClientDC
 213 //-----------------------------------------------------------------------------
 214
 215 IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)
 216
 217 wxClientDC::wxClientDC(wxWindow *win)
 218 {
 219     wxCHECK_RET( win, _T("invalid window") );
 220
 221     wxRect rect = win->GetClientRect();
 222     InitForWin(win, &rect);
 223 }
 224
 225 //-----------------------------------------------------------------------------
 226 // wxPaintDC
 227 //-----------------------------------------------------------------------------
 228
 229 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxWindowDC)