src/dfb/dcclient.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/dfb/dcclient.cpp
   3 // Purpose:     wxWindowDCImpl, wxClientDCImpl 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 #ifndef WX_PRECOMP
  27     #include "wx/window.h"
  28     #include "wx/nonownedwnd.h"
  29 #endif
  30
  31 #include "wx/dfb/dcclient.h"
  32 #include "wx/dfb/private.h"
  33
  34 #define TRACE_PAINT  "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
  62     // normal windows cannot extend out of its parent's client area:
  63     if ( !win->CanBeOutsideClientArea() )
  64         rp.Intersect(parent->GetClientRect());
  65
  66     rp.Offset(-win->GetPosition());
  67     rp.Offset(-parent->GetClientAreaOrigin());
  68     r.Intersect(rp);
  69
  70     return r;
  71 }
  72
  73 // creates a dummy surface that has the same format as the real window's
  74 // surface, but is not visible and so can be painted on even if the window
  75 // is hidden
  76 static
  77 wxIDirectFBSurfacePtr CreateDummySurface(wxWindow *win, const wxRect *rect)
  78 {
  79     wxLogTrace(TRACE_PAINT, "%p ('%s'): creating dummy DC surface",
  80                win, win->GetName().c_str());
  81     wxSize size(rect ? rect->GetSize() : win->GetSize());
  82
  83     // we can't create a surface of 0 size but the size of the window may be 0,
  84     // so ensure that we have at least a single pixel to draw on
  85     size.IncTo(wxSize(1, 1));
  86
  87     return win->GetDfbSurface()->CreateCompatible
  88            (
  89              size,
  90              wxIDirectFBSurface::CreateCompatible_NoBackBuffer
  91            );
  92 }
  93
  94 //-----------------------------------------------------------------------------
  95 // wxWindowDCImpl
  96 //-----------------------------------------------------------------------------
  97
  98 IMPLEMENT_ABSTRACT_CLASS(wxWindowDCImpl, wxDFBDCImpl)
  99
 100 wxWindowDCImpl::wxWindowDCImpl(wxDC *owner, wxWindow *win)
 101               : wxDFBDCImpl(owner)
 102 {
 103     InitForWin(win, NULL);
 104 }
 105
 106 void wxWindowDCImpl::InitForWin(wxWindow *win, const wxRect *rect)
 107 {
 108     wxCHECK_RET( win, "invalid window" );
 109
 110     m_win = win;
 111
 112     // obtain the surface used for painting:
 113     wxPoint origin;
 114     wxIDirectFBSurfacePtr surface;
 115
 116     wxRect rectOrig(rect ? *rect : wxRect(win->GetSize()));
 117     wxRect r;
 118
 119     if ( !win->IsShownOnScreen() )
 120     {
 121         // leave 'r' rectangle empty to indicate the window is not visible,
 122         // see below (below "create the surface:") for how is this case handled
 123     }
 124     else
 125     {
 126         // compute painting rectangle after clipping if we're in PaintWindow
 127         // code, otherwise paint on the entire window:
 128         r = rectOrig;
 129
 130         const wxRegion& updateRegion = win->GetUpdateRegion();
 131         if ( win->GetTLW()->IsPainting() && !updateRegion.IsEmpty() )
 132         {
 133             r.Intersect(updateRegion.AsRect());
 134             wxCHECK_RET( !r.IsEmpty(), "invalid painting rectangle" );
 135
 136             // parent TLW will flip the entire surface when painting is done
 137             m_shouldFlip = false;
 138         }
 139         else
 140         {
 141             // One of two things happened:
 142             // (1) the TLW is not being painted by PaintWindow() now; or
 143             // (2) we're drawing on some window other than the one that is
 144             //     currently painted on by PaintWindow()
 145             // In either case, we need to flip the surface when we're done
 146             // painting and we don't have to use updateRegion for clipping.
 147             // OTOH, if the window is (partially) hidden by being
 148             // out of its parent's area, we must clip the surface accordingly.
 149             r.Intersect(GetUncoveredWindowArea(win));
 150             m_shouldFlip = true; // paint the results immediately
 151         }
 152     }
 153
 154     // create the surface:
 155     if ( r.IsEmpty() )
 156     {
 157         // we're painting on invisible window: the changes won't have any
 158         // effect, as the window will be repainted anyhow when it is shown,
 159         // but we still need a valid DC so that e.g. text extents can be
 160         // measured, so let's create a dummy surface that has the same
 161         // format as the real one would have and let the code paint on it:
 162         surface = CreateDummySurface(win, rect);
 163
 164         // painting on hidden window has no effect on TLW's surface, don't
 165         // waste time flipping the dummy surface:
 166         m_shouldFlip = false;
 167     }
 168     else
 169     {
 170         m_winRect = r;
 171         DFBRectangle dfbrect = { r.x, r.y, r.width, r.height };
 172         surface = win->GetDfbSurface()->GetSubSurface(&dfbrect);
 173
 174         // if the DC was clipped thanks to rectPaint, we must adjust the
 175         // origin accordingly; but we do *not* adjust for 'rect', because
 176         // rect.GetPosition() has coordinates (0,0) in the DC:
 177         origin.x = rectOrig.x - r.x;
 178         origin.y = rectOrig.y - r.y;
 179
 180         // m_shouldFlip was set in the "if" block above this one
 181     }
 182
 183     if ( !surface )
 184         return;
 185
 186     wxLogTrace(TRACE_PAINT,
 187                "%p ('%s'): creating DC for area [%i,%i,%i,%i], clipped to [%i,%i,%i,%i], origin [%i,%i]",
 188                win, win->GetName().c_str(),
 189                rectOrig.x, rectOrig.y, rectOrig.GetRight(), rectOrig.GetBottom(),
 190                r.x, r.y, r.GetRight(), r.GetBottom(),
 191                origin.x, origin.y);
 192
 193     DFBInit(surface);
 194     SetFont(win->GetFont());
 195
 196     // offset coordinates to account for subsurface's origin coordinates:
 197     SetDeviceOrigin(origin.x, origin.y);
 198 }
 199
 200 wxWindowDCImpl::~wxWindowDCImpl()
 201 {
 202     wxIDirectFBSurfacePtr surface(GetDirectFBSurface());
 203     if ( !surface )
 204         return;
 205
 206     // if no painting was done on the DC, we don't have to flip the surface:
 207     if ( !m_isBBoxValid )
 208         return;
 209
 210     if ( m_shouldFlip )
 211     {
 212         // paint overlays on top of the surface being drawn to by this DC
 213         // before showing anything on the screen:
 214         m_win->PaintOverlays(m_winRect);
 215
 216         DFBSurfaceCapabilities caps = DSCAPS_NONE;
 217         surface->GetCapabilities(&caps);
 218         if ( caps & DSCAPS_DOUBLE )
 219         {
 220             // FIXME: flip only modified parts of the surface
 221             surface->FlipToFront();
 222         }
 223         // else: the surface is not double-buffered and so cannot be flipped
 224     }
 225     // else: don't flip the surface, wxTLW will do it when it finishes
 226     //       painting of its invalidated areas
 227 }
 228
 229 //-----------------------------------------------------------------------------
 230 // wxClientDCImpl
 231 //-----------------------------------------------------------------------------
 232
 233 IMPLEMENT_ABSTRACT_CLASS(wxClientDCImpl, wxWindowDCImpl)
 234
 235 wxClientDCImpl::wxClientDCImpl(wxDC *owner, wxWindow *win)
 236               : wxWindowDCImpl(owner, win)
 237 {
 238     wxCHECK_RET( win, "invalid window" );
 239
 240     wxRect rect = win->GetClientRect();
 241     InitForWin(win, &rect);
 242 }
 243
 244 //-----------------------------------------------------------------------------
 245 // wxPaintDC
 246 //-----------------------------------------------------------------------------
 247
 248 IMPLEMENT_ABSTRACT_CLASS(wxPaintDCImpl, wxWindowDCImpl)