X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/17dd5538ef281b552875e9a7c5c49cf87d8b1ad9..f1f5f16f780bb41aa2ea24ccbf728f14c86cc475:/src/dfb/dcclient.cpp

diff --git a/src/dfb/dcclient.cpp b/src/dfb/dcclient.cpp
index 36a57c8330..1045b6305e 100644
--- a/src/dfb/dcclient.cpp
+++ b/src/dfb/dcclient.cpp
@@ -31,10 +31,56 @@
 
 #include "wx/dfb/private.h"
 
+#define TRACE_PAINT  _T("paint")
+
 // ===========================================================================
 // implementation
 // ===========================================================================
 
+//-----------------------------------------------------------------------------
+// helpers
+//-----------------------------------------------------------------------------
+
+// Returns subrect of the window that is not outside of its parent's
+// boundaries ("hidden behind its borders"), recursively:
+static wxRect GetUncoveredWindowArea(wxWindow *win)
+{
+    wxRect r(win->GetSize());
+
+    if ( win->IsTopLevel() )
+        return r;
+
+    wxWindow *parent = win->GetParent();
+    if ( !parent )
+        return r;
+
+    // intersect with parent's uncovered area, after offsetting it into win's
+    // coordinates; this will remove parts of 'r' that are outside of the
+    // parent's area:
+    wxRect rp(GetUncoveredWindowArea(parent));
+    rp.Offset(-win->GetPosition());
+    rp.Offset(-parent->GetClientAreaOrigin());
+    r.Intersect(rp);
+
+    return r;
+}
+
+// creates a dummy surface that has the same format as the real window's
+// surface, but is not visible and so can be painted on even if the window
+// is hidden
+static
+wxIDirectFBSurfacePtr CreateDummySurface(wxWindow *win, const wxRect *rect)
+{
+    wxLogTrace(TRACE_PAINT, _T("%p ('%s'): creating dummy DC surface"),
+               win, win->GetName().c_str());
+    wxSize size(rect ? rect->GetSize() : win->GetSize());
+    return win->GetDfbSurface()->CreateCompatible
+           (
+             size,
+             wxIDirectFBSurface::CreateCompatible_NoBackBuffer
+           );
+}
+
 //-----------------------------------------------------------------------------
 // wxWindowDC
 //-----------------------------------------------------------------------------
@@ -42,56 +88,131 @@
 IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
 
 wxWindowDC::wxWindowDC(wxWindow *win)
-    : wxDC(win ? win->GetDfbSurface() : NULL)
 {
-    InitForWin(win);
+    InitForWin(win, NULL);
 }
 
-void wxWindowDC::InitForWin(wxWindow *win)
+void wxWindowDC::InitForWin(wxWindow *win, const wxRect *rect)
 {
     wxCHECK_RET( win, _T("invalid window") );
 
-    // FIXME: this should be made to work: we need to detect that the window
-    //        is not visible and in that case, a) ignore any drawing actions
-    //        and b) provide dummy surface that can still be used to get
-    //        information (e.g. text extents):
-    wxWindow *w = win;
-    for ( wxWindow *w = win; w; w = w->GetParent() )
+    m_win = win;
+
+    // obtain the surface used for painting:
+    wxPoint origin;
+    wxIDirectFBSurfacePtr surface;
+
+    wxRect rectOrig(rect ? *rect : wxRect(win->GetSize()));
+    wxRect r;
+
+    if ( !win->IsShownOnScreen() )
+    {
+        // leave 'r' rectangle empty to indicate the window is not visible,
+        // see below (below "create the surface:") for how is this case handled
+    }
+    else
     {
-        // painting on hidden TLW when non-TLW windows are shown is OK,
-        // DirectFB manages that:
-        if ( w->IsTopLevel() )
-            break;
+        // compute painting rectangle after clipping if we're in PaintWindow
+        // code, otherwise paint on the entire window:
+        r = rectOrig;
+
+        const wxRegion& updateRegion = win->GetUpdateRegion();
+        if ( win->GetTLW()->IsPainting() && !updateRegion.IsEmpty() )
+        {
+            r.Intersect(updateRegion.AsRect());
+            wxCHECK_RET( !r.IsEmpty(), _T("invalid painting rectangle") );
+
+            // parent TLW will flip the entire surface when painting is done
+            m_shouldFlip = false;
+        }
+        else
+        {
+            // One of two things happened:
+            // (1) the TLW is not being painted by PaintWindow() now; or
+            // (2) we're drawing on some window other than the one that is
+            //     currently painted on by PaintWindow()
+            // In either case, we need to flip the surface when we're done
+            // painting and we don't have to use updateRegion for clipping.
+            // OTOH, if the window is (partially) hidden by being
+            // out of its parent's area, we must clip the surface accordingly.
+            r.Intersect(GetUncoveredWindowArea(win));
+            m_shouldFlip = true; // paint the results immediately
+        }
+    }
 
-        wxASSERT_MSG( w->IsShown(),
-                      _T("painting on hidden window not implemented yet") );
+    // create the surface:
+    if ( r.IsEmpty() )
+    {
+        // we're painting on invisible window: the changes won't have any
+        // effect, as the window will be repainted anyhow when it is shown,
+        // but we still need a valid DC so that e.g. text extents can be
+        // measured, so let's create a dummy surface that has the same
+        // format as the real one would have and let the code paint on it:
+        surface = CreateDummySurface(win, rect);
+
+        // painting on hidden window has no effect on TLW's surface, don't
+        // waste time flipping the dummy surface:
+        m_shouldFlip = false;
     }
+    else
+    {
+        m_winRect = r;
+        DFBRectangle dfbrect = { r.x, r.y, r.width, r.height };
+        surface = win->GetDfbSurface()->GetSubSurface(&dfbrect);
 
+        // if the DC was clipped thanks to rectPaint, we must adjust the
+        // origin accordingly; but we do *not* adjust for 'rect', because
+        // rect.GetPosition() has coordinates (0,0) in the DC:
+        origin.x = rectOrig.x - r.x;
+        origin.y = rectOrig.y - r.y;
 
-    SetFont(win->GetFont());
-}
+        // m_shouldFlip was set in the "if" block above this one
+    }
 
-//-----------------------------------------------------------------------------
-// base class for wxClientDC and wxPaintDC
-//-----------------------------------------------------------------------------
+    if ( !surface )
+        return;
 
-wxClientDCBase::wxClientDCBase(wxWindow *win)
-{
-    wxCHECK_RET( win, _T("invalid window") );
+    wxLogTrace(TRACE_PAINT,
+               _T("%p ('%s'): creating DC for area [%i,%i,%i,%i], clipped to [%i,%i,%i,%i], origin [%i,%i]"),
+               win, win->GetName().c_str(),
+               rectOrig.x, rectOrig.y, rectOrig.GetRight(), rectOrig.GetBottom(),
+               r.x, r.y, r.GetRight(), r.GetBottom(),
+               origin.x, origin.y);
 
-    wxRect rect = win->GetClientRect();
-    DFBRectangle dfbrect = { rect.x, rect.y, rect.width, rect.height };
+    DFBInit(surface);
+    SetFont(win->GetFont());
+
+    // offset coordinates to account for subsurface's origin coordinates:
+    SetDeviceOrigin(origin.x, origin.y);
+}
 
-    wxIDirectFBSurfacePtr subsurf(
-            win->GetDfbSurface()->GetSubSurface(&dfbrect));
-    if ( !subsurf )
+wxWindowDC::~wxWindowDC()
+{
+    wxIDirectFBSurfacePtr surface(GetDirectFBSurface());
+    if ( !surface )
         return;
 
-    Init(subsurf);
-    InitForWin(win);
+    // if no painting was done on the DC, we don't have to flip the surface:
+    if ( !m_isBBoxValid )
+        return;
 
-    // offset coordinates to account for subsurface's origin coordinates:
-    SetDeviceOrigin(rect.x, rect.y);
+    if ( m_shouldFlip )
+    {
+        // paint overlays on top of the surface being drawn to by this DC
+        // before showing anything on the screen:
+        m_win->PaintOverlays(m_winRect);
+
+        DFBSurfaceCapabilities caps = DSCAPS_NONE;
+        surface->GetCapabilities(&caps);
+        if ( caps & DSCAPS_DOUBLE )
+        {
+            // FIXME: flip only modified parts of the surface
+            surface->FlipToFront();
+        }
+        // else: the surface is not double-buffered and so cannot be flipped
+    }
+    // else: don't flip the surface, wxTLW will do it when it finishes
+    //       painting of its invalidated areas
 }
 
 //-----------------------------------------------------------------------------
@@ -100,15 +221,12 @@ wxClientDCBase::wxClientDCBase(wxWindow *win)
 
 IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)
 
-wxClientDC::~wxClientDC()
+wxClientDC::wxClientDC(wxWindow *win)
 {
-    // flip to surface so that the changes become visible
-    wxIDirectFBSurfacePtr surface(GetDirectFBSurface());
+    wxCHECK_RET( win, _T("invalid window") );
 
-    // FIXME: do this only if the surface was modified (as opposed to e.g.
-    //        used only to obtain text metrics)
-    if ( surface )
-        surface->Flip(NULL, DSFLIP_NONE);
+    wxRect rect = win->GetClientRect();
+    InitForWin(win, &rect);
 }
 
 //-----------------------------------------------------------------------------
@@ -116,12 +234,3 @@ wxClientDC::~wxClientDC()
 //-----------------------------------------------------------------------------
 
 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxWindowDC)
-
-#warning "wxPaintDC ctor must respect m_updateRegion"
-
-wxPaintDC::~wxPaintDC()
-{
-    // NB: do *not* flip the surface: wxPaintDC is used with EVT_PAINT and the
-    //     surface will be flipped for the entire TLW once all children are
-    //     repainted
-}