Merge branch 'gtk-dpi'

A bunch of improvements for per-monitor DPI support in wxGTK and
wxGraphicsContext more generally.

Closes https://github.com/wxWidgets/wxWidgets/pull/995

docs/changes.txt

@@ -138,6 +138,7 @@ All (GUI):
 - Add strikethrough support for fonts defined in XRC.
 - Add wxDisplay::GetPPI().
 - Add wxJoystickEvent::GetButtonOrdinal() (Mick Phillips).
+- Add wxGraphicsContext::GetWindow() and implement wxGraphicsContext::GetDPI().
 
 wxGTK:
 

include/wx/display.h

@@ -49,6 +49,10 @@ public:
     // primary display and the only one which is always supported
     wxDisplay(unsigned n = 0);
 
+    // create display object corresponding to the display of the given window
+    // or the default one if the window display couldn't be found
+    explicit wxDisplay(const wxWindow* window);
+
     // dtor is not virtual as this is a concrete class not meant to be derived
     // from
 

include/wx/graphics.h

@@ -452,7 +452,7 @@ private:
 class WXDLLIMPEXP_CORE wxGraphicsContext : public wxGraphicsObject
 {
 public:
-    wxGraphicsContext(wxGraphicsRenderer* renderer);
+    wxGraphicsContext(wxGraphicsRenderer* renderer, wxWindow* window = NULL);
 
     virtual ~wxGraphicsContext();
 
@@ -490,6 +490,9 @@ public:
     // create a context that can be used for measuring texts only, no drawing allowed
     static wxGraphicsContext * Create();
 
+    // Return the window this context is associated with, if any.
+    wxWindow* GetWindow() const { return m_window; }
+
     // begin a new document (relevant only for printing / pdf etc) if there is a progress dialog, message will be shown
     virtual bool StartDoc( const wxString& message );
 
@@ -788,6 +791,12 @@ protected:
                                          wxDouble angle,
                                          const wxGraphicsBrush& backgroundBrush);
 
+private:
+    // The associated window, if any, i.e. if one was passed directly to
+    // Create() or the associated window of the wxDC this context was created
+    // from.
+    wxWindow* const m_window;
+
     wxDECLARE_NO_COPY_CLASS(wxGraphicsContext);
     wxDECLARE_ABSTRACT_CLASS(wxGraphicsContext);
 };

include/wx/private/display.h

@@ -81,8 +81,11 @@ public:
     // return the depth or 0 if unknown
     virtual int GetDepth() const = 0;
 
-    // return the resolution of the display, uses GetSizeMM() by default but
+    // return the scale factor used to convert logical pixels to physical ones
-    // can be also overridden directly
+    virtual double GetScaleFactor() const { return 1.0; }
+
+    // return the resolution of the display, uses GetSize(), GetScaleFactor()
+    // and GetSizeMM() by default but can be also overridden directly
     virtual wxSize GetPPI() const;
 
     // return the physical size of the display or (0, 0) if unknown: this is
@@ -115,6 +118,11 @@ protected:
     // create the object providing access to the display with the given index
     wxDisplayImpl(unsigned n) : m_index(n) { }
 
+    // Compute PPI from the sizes in pixels and mm.
+    //
+    // Return (0, 0) if physical size (in mm) is not known, i.e. 0.
+    static wxSize ComputePPI(int pxX, int pxY, int mmX, int mmY);
+
 
     // the index of this display (0 is always the primary one)
     const unsigned m_index;

interface/wx/display.h

@@ -26,6 +26,23 @@ public:
     */
     wxDisplay(unsigned int index = 0);
 
+    /**
+        Constructor creating the display object associated with the given
+        window.
+
+        This is the most convenient way of finding the display on which the
+        given window is shown while falling back to the default display if it
+        is not shown at all or positioned outside of any display.
+
+        @param window
+            A valid, i.e. non-null, window.
+
+        @see GetFromWindow()
+
+        @since 3.1.2
+     */
+    explicit wxDisplay(const wxWindow* window);
+
     /**
         Destructor.
     */

interface/wx/graphics.h

@@ -1095,6 +1095,19 @@ public:
     */
     virtual void GetDPI( wxDouble* dpiX, wxDouble* dpiY);
 
+    /**
+        Returns the associated window if any.
+
+        If this context was created using Create() overload taking wxWindow or
+        wxWindowDC, this method returns the corresponding window. Otherwise
+        returns @NULL.
+
+        @return A possibly @NULL window pointer.
+
+        @since 3.1.2
+     */
+    wxWindow* GetWindow() const;
+
     /** @}
     */
 

samples/display/display.cpp

@@ -232,9 +232,7 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size,
 #endif // wxUSE_STATUSBAR
 
     // create child controls
-    wxPanel *panel = new wxPanel(this, wxID_ANY);
+    m_book = new wxBookCtrl(this, wxID_ANY);
-
-    m_book = new wxBookCtrl(panel, wxID_ANY);
     const size_t countDpy = wxDisplay::GetCount();
     for ( size_t nDpy = 0; nDpy < countDpy; nDpy++ )
     {
@@ -291,6 +289,7 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size,
         sizer->Add(new wxStaticText(page, wxID_ANY,
                                     display.IsPrimary() ? "yes" : "no"));
 
+        // add it to another sizer to have borders around it and button below
         wxSizer *sizerTop = new wxBoxSizer(wxVERTICAL);
         sizerTop->Add(sizer, 1, wxALL | wxEXPAND, 10);
 
@@ -313,22 +312,19 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size,
         sizer->Add(new wxStaticText(page, Display_CurrentMode,
                                     VideoModeToText(display.GetCurrentMode())));
 
-        // add it to another sizer to have borders around it and button below
         sizerTop->Add(new wxButton(page, Display_ResetMode, "&Reset mode"),
                       0, wxALL | wxCENTRE, 5);
 #endif // wxUSE_DISPLAY
 
         page->SetSizer(sizerTop);
+        page->Layout();
 
         m_book->AddPage(page,
                         wxString::Format("Display %lu",
                                          (unsigned long)nDpy));
     }
 
-    wxBoxSizer *sizer = new wxBoxSizer(wxHORIZONTAL);
+    SetClientSize(m_book->GetBestSize());
-    sizer->Add(m_book, 1, wxEXPAND);
-    panel->SetSizer(sizer);
-    sizer->SetSizeHints(this);
 }
 
 #if wxUSE_DISPLAY

src/common/dcgraph.cpp

@@ -418,6 +418,15 @@ void wxGCDCImpl::SetTextBackground( const wxColour &col )
 
 wxSize wxGCDCImpl::GetPPI() const
 {
+    if ( m_graphicContext )
+    {
+        wxDouble x, y;
+        m_graphicContext->GetDPI(&x, &y);
+        return wxSize(wxRound(x), wxRound(y));
+    }
+
+    // This is the same value that wxGraphicsContext::GetDPI() returns by
+    // default.
     return wxSize(72, 72);
 }
 

src/common/dlgcmn.cpp

@@ -871,7 +871,7 @@ int wxStandardDialogLayoutAdapter::DoMustScroll(wxDialog* dialog, wxSize& window
     wxSize minWindowSize = dialog->GetSizer()->GetMinSize();
     windowSize = dialog->GetSize();
     windowSize = wxSize(wxMax(windowSize.x, minWindowSize.x), wxMax(windowSize.y, minWindowSize.y));
-    displaySize = wxDisplay(wxDisplay::GetFromWindow(dialog)).GetClientArea().GetSize();
+    displaySize = wxDisplay(dialog).GetClientArea().GetSize();
 
     int flags = 0;
 

src/common/dpycmn.cpp

@@ -85,6 +85,13 @@ wxDisplay::wxDisplay(unsigned n)
     m_impl = Factory().GetDisplay(n);
 }
 
+wxDisplay::wxDisplay(const wxWindow* window)
+{
+    const int n = GetFromWindow(window);
+
+    m_impl = Factory().GetDisplay(n != wxNOT_FOUND ? n : 0);
+}
+
 // ----------------------------------------------------------------------------
 // static functions forwarded to wxDisplayFactory
 // ----------------------------------------------------------------------------
@@ -193,20 +200,29 @@ bool wxDisplay::ChangeMode(const wxVideoMode& mode)
 // wxDisplayImpl implementation
 // ============================================================================
 
-wxSize wxDisplayImpl::GetPPI() const
+/* static */
+wxSize wxDisplayImpl::ComputePPI(int pxX, int pxY, int mmX, int mmY)
 {
-    const wxSize pixels = GetGeometry().GetSize();
+    if ( !mmX || !mmY )
-    const wxSize mm = GetSizeMM();
-
-    if ( !mm.x || !mm.y )
     {
         // Physical size is unknown, return a special value indicating that we
         // can't compute the resolution -- what else can we do?
         return wxSize(0, 0);
     }
 
-    return wxSize(wxRound((pixels.x * inches2mm) / mm.x),
+    return wxSize(wxRound((pxX * inches2mm) / mmX),
-                  wxRound((pixels.y * inches2mm) / mm.y));
+                  wxRound((pxY * inches2mm) / mmY));
+}
+
+wxSize wxDisplayImpl::GetPPI() const
+{
+    const wxSize mm = GetSizeMM();
+
+    // We need physical pixels here, not logical ones returned by
+    // GetGeometry(), to compute the real DPI.
+    const wxSize pixels = GetGeometry().GetSize()*GetScaleFactor();
+
+    return ComputePPI(pixels.x, pixels.y, mm.x, mm.y);
 }
 
 // ============================================================================
@@ -224,6 +240,8 @@ wxDisplayFactory::~wxDisplayFactory()
 
 int wxDisplayFactory::GetFromWindow(const wxWindow *window)
 {
+    wxCHECK_MSG( window, wxNOT_FOUND, "window can't be NULL" );
+
     // consider that the window belongs to the display containing its centre
     const wxRect r(window->GetScreenRect());
     return GetFromPoint(wxPoint(r.x + r.width/2, r.y + r.height/2));

src/common/graphcmn.cpp

@@ -31,6 +31,8 @@
     #include "wx/log.h"
 #endif
 
+#include "wx/display.h"
+
 #ifdef __WXMSW__
     #include "wx/msw/enhmeta.h"
 #endif
@@ -565,12 +567,14 @@ void * wxGraphicsBitmap::GetNativeBitmap() const
 wxIMPLEMENT_ABSTRACT_CLASS(wxGraphicsContext, wxObject);
 
 
-wxGraphicsContext::wxGraphicsContext(wxGraphicsRenderer* renderer) :
+wxGraphicsContext::wxGraphicsContext(wxGraphicsRenderer* renderer,
-    wxGraphicsObject(renderer),
+                                     wxWindow* window)
+    : wxGraphicsObject(renderer),
       m_antialias(wxANTIALIAS_DEFAULT),
       m_composition(wxCOMPOSITION_OVER),
       m_interpolation(wxINTERPOLATION_DEFAULT),
-      m_enableOffset(false)
+      m_enableOffset(false),
+      m_window(window)
 {
 }
 
@@ -618,8 +622,19 @@ wxDouble wxGraphicsContext::GetAlpha() const
 
 void wxGraphicsContext::GetDPI( wxDouble* dpiX, wxDouble* dpiY)
 {
+    if ( m_window )
+    {
+        const wxSize ppi = wxDisplay(m_window).GetPPI();
+        *dpiX = ppi.x;
+        *dpiY = ppi.y;
+    }
+    else
+    {
+        // Use some standard DPI value, it doesn't make much sense for the
+        // contexts not using any pixels anyhow.
         *dpiX = 72.0;
         *dpiY = 72.0;
+    }
 }
 
 // sets the pen

src/common/sizer.cpp

@@ -930,15 +930,9 @@ wxSize wxSizer::ComputeFittingClientSize(wxWindow *window)
             return tlw->GetClientSize();
         }
 
-        // limit the window to the size of the display it is on
+        // limit the window to the size of the display it is on (or the main
-        int disp = wxDisplay::GetFromWindow(window);
+        // one if the window display can't be determined)
-        if ( disp == wxNOT_FOUND )
+        sizeMax = wxDisplay(window).GetClientArea().GetSize();
-        {
-            // or, if we don't know which one it is, of the main one
-            disp = 0;
-        }
-
-        sizeMax = wxDisplay(disp).GetClientArea().GetSize();
 
         // If determining the display size failed, skip the max size checks as
         // we really don't want to create windows of (0, 0) size.

src/common/toplvcmn.cpp

@@ -249,8 +249,7 @@ void wxTopLevelWindowBase::DoCentre(int dir)
     // we need the display rect anyhow so store it first: notice that we should
     // be centered on the same display as our parent window, the display of
     // this window itself is not really defined yet
-    int nDisplay = wxDisplay::GetFromWindow(GetParent() ? GetParent() : this);
+    wxDisplay dpy(GetParent() ? GetParent() : this);
-    wxDisplay dpy(nDisplay == wxNOT_FOUND ? 0 : nDisplay);
     const wxRect rectDisplay(dpy.GetClientArea());
 
     // what should we centre this window on?

src/generic/graphicc.cpp

@@ -1830,7 +1830,7 @@ wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxPrinterDC&
 #endif
 
 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc )
-: wxGraphicsContext(renderer)
+: wxGraphicsContext(renderer, dc.GetWindow())
 {
     int width, height;
     dc.GetSize( &width, &height );
@@ -2244,7 +2244,7 @@ wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context )
 }
 
 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window)
-    : wxGraphicsContext(renderer)
+    : wxGraphicsContext(renderer, window)
 #ifdef __WXMSW__
     , m_mswWindowHDC(GetHwndOf(window))
 #endif

src/generic/richtooltipg.cpp

@@ -318,11 +318,7 @@ private:
 
         // Use GetFromWindow() and not GetFromPoint() here to try to get the
         // correct display even if the tip point itself is not visible.
-        int dpy = wxDisplay::GetFromWindow(GetParent());
+        const wxRect rectDpy = wxDisplay(GetParent()).GetClientArea();
-        if ( dpy == wxNOT_FOUND )
-            dpy = 0; // What else can we do?
-
-        const wxRect rectDpy = wxDisplay(dpy).GetClientArea();
 
 #ifdef __WXMAC__
         return pos.y > rectDpy.height/2 ? wxTipKind_Bottom : wxTipKind_Top;

src/gtk/dc.cpp

@@ -15,6 +15,7 @@
 #include "wx/dcclient.h"
 #include "wx/dcmemory.h"
 #include "wx/dcscreen.h"
+#include "wx/display.h"
 #include "wx/gdicmn.h"
 #include "wx/icon.h"
 #include "wx/gtk/dc.h"
@@ -238,7 +239,7 @@ wxSize wxGTKCairoDCImpl::GetPPI() const
 {
     if ( m_window )
     {
-        return wxGetDisplayPPI();
+        return wxDisplay(m_window).GetPPI();
     }
 
     // For a non-window-based DC the concept of PPI doesn't make much sense

src/gtk/display.cpp

@@ -46,6 +46,7 @@ public:
     virtual wxRect GetGeometry() const wxOVERRIDE;
     virtual wxRect GetClientArea() const wxOVERRIDE;
     virtual int GetDepth() const wxOVERRIDE;
+    virtual double GetScaleFactor() const wxOVERRIDE;
     virtual wxSize GetSizeMM() const wxOVERRIDE;
 
 #if wxUSE_DISPLAY
@@ -121,6 +122,11 @@ int wxDisplayImplGTK::GetDepth() const
     return 24;
 }
 
+double wxDisplayImplGTK::GetScaleFactor() const
+{
+    return gdk_monitor_get_scale_factor(m_monitor);
+}
+
 wxSize wxDisplayImplGTK::GetSizeMM() const
 {
     return wxSize
@@ -222,6 +228,10 @@ public:
     virtual wxRect GetGeometry() const wxOVERRIDE;
     virtual wxRect GetClientArea() const wxOVERRIDE;
     virtual int GetDepth() const wxOVERRIDE;
+#if GTK_CHECK_VERSION(3,10,0)
+    virtual double GetScaleFactor() const wxOVERRIDE;
+#endif // GTK+ 3.10
+    virtual wxSize GetPPI() const wxOVERRIDE;
     virtual wxSize GetSizeMM() const wxOVERRIDE;
 
 #if wxUSE_DISPLAY
@@ -293,16 +303,36 @@ int wxDisplayImplGTK::GetDepth() const
     return gdk_visual_get_depth(gdk_window_get_visual(wxGetTopLevelGDK()));
 }
 
-wxSize wxDisplayImplGTK::GetSizeMM() const
+#if GTK_CHECK_VERSION(3,10,0)
+double wxDisplayImplGTK::GetScaleFactor() const
 {
-    // At least in some configurations, gdk_screen_xxx_mm() functions return
+    if ( gtk_check_version(3,10,0) == NULL )
-    // valid values when gdk_screen_get_monitor_xxx_mm() only return -1, so
+        return gdk_screen_get_monitor_scale_factor(m_screen, m_index);
-    // handle this case specially.
+
-    if ( IsPrimary() )
+    return 1.0;
+}
+#endif // GTK+ 3.10
+
+wxSize wxDisplayImplGTK::GetPPI() const
+{
+    // Try the base class version which uses our GetSizeMM() and returns
+    // per-display PPI value if it works.
+    wxSize ppi = wxDisplayImpl::GetPPI();
+
+    if ( !ppi.x || !ppi.y )
     {
-        return wxSize(gdk_screen_width_mm(), gdk_screen_height_mm());
+        // But if it didn't work, fall back to the global DPI value common to
+        // all displays -- this is still better than nothing and more
+        // compatible with the previous wxWidgets versions.
+        ppi = ComputePPI(gdk_screen_width(), gdk_screen_height(),
+                         gdk_screen_width_mm(), gdk_screen_height_mm());
     }
 
+    return ppi;
+}
+
+wxSize wxDisplayImplGTK::GetSizeMM() const
+{
     wxSize sizeMM;
 #if GTK_CHECK_VERSION(2,14,0)
     if ( wx_is_at_least_gtk2(14) )
@@ -318,6 +348,19 @@ wxSize wxDisplayImplGTK::GetSizeMM() const
             sizeMM.y = rc;
     }
 #endif // GTK+ 2.14
+
+    // When we have only a single display, we can use global GTK+ functions.
+    // Note that at least in some configurations, these functions return valid
+    // values when gdk_screen_get_monitor_xxx_mm() only return -1, so it's
+    // always worth fallng back on them, but we can't do it when using
+    // multiple displays because they combine the sizes of all displays in this
+    // case, which would result in a completely wrong value for GetPPI().
+    if ( !(sizeMM.x && sizeMM.y) && gdk_screen_get_n_monitors(m_screen) == 1 )
+    {
+        sizeMM.x = gdk_screen_width_mm();
+        sizeMM.y = gdk_screen_height_mm();
+    }
+
     return sizeMM;
 }
 

src/msw/graphics.cpp

@@ -358,7 +358,7 @@ class wxGDIPlusContext : public wxGraphicsContext
 public:
     wxGDIPlusContext( wxGraphicsRenderer* renderer, const wxDC& dc );
     wxGDIPlusContext( wxGraphicsRenderer* renderer, HDC hdc, wxDouble width, wxDouble height );
-    wxGDIPlusContext( wxGraphicsRenderer* renderer, HWND hwnd );
+    wxGDIPlusContext( wxGraphicsRenderer* renderer, HWND hwnd, wxWindow* window = NULL);
     wxGDIPlusContext( wxGraphicsRenderer* renderer, Graphics* gr);
     wxGDIPlusContext(wxGraphicsRenderer* renderer);
 
@@ -1647,7 +1647,7 @@ wxGDIPlusContext::wxGDIPlusContext( wxGraphicsRenderer* renderer, HDC hdc, wxDou
 }
 
 wxGDIPlusContext::wxGDIPlusContext( wxGraphicsRenderer* renderer, const wxDC& dc )
-    : wxGraphicsContext(renderer)
+    : wxGraphicsContext(renderer, dc.GetWindow())
 {
     wxMSWDCImpl *msw = wxDynamicCast( dc.GetImpl() , wxMSWDCImpl );
     HDC hdc = (HDC) msw->GetHDC();
@@ -1656,8 +1656,10 @@ wxGDIPlusContext::wxGDIPlusContext( wxGraphicsRenderer* renderer, const wxDC& dc
     Init(new Graphics(hdc), sz.x, sz.y);
 }
 
-wxGDIPlusContext::wxGDIPlusContext( wxGraphicsRenderer* renderer, HWND hwnd  )
+wxGDIPlusContext::wxGDIPlusContext( wxGraphicsRenderer* renderer,
-    : wxGraphicsContext(renderer)
+                                    HWND hwnd,
+                                    wxWindow* window )
+    : wxGraphicsContext(renderer, window)
 {
     RECT rect = wxGetWindowRect(hwnd);
     Init(new Graphics(hwnd), rect.right - rect.left, rect.bottom - rect.top);
@@ -2492,7 +2494,7 @@ wxGraphicsContext * wxGDIPlusRenderer::CreateContextFromNativeHDC(WXHDC dc)
 wxGraphicsContext * wxGDIPlusRenderer::CreateContext( wxWindow* window )
 {
     ENSURE_LOADED_OR_RETURN(NULL);
-    return new wxGDIPlusContext(this, (HWND) window->GetHWND() );
+    return new wxGDIPlusContext(this, (HWND) window->GetHWND(), window );
 }
 
 // Path

src/msw/graphicsd2d.cpp

@@ -3462,9 +3462,19 @@ public:
 class wxD2DContext : public wxGraphicsContext, wxD2DResourceManager
 {
 public:
-    wxD2DContext(wxGraphicsRenderer* renderer, ID2D1Factory* direct2dFactory, HWND hwnd);
+    // Create the context for the given HWND, which may be associated (if it's
+    // non-null) with the given wxWindow.
+    wxD2DContext(wxGraphicsRenderer* renderer,
+                 ID2D1Factory* direct2dFactory,
+                 HWND hwnd,
+                 wxWindow* window = NULL);
 
-    wxD2DContext(wxGraphicsRenderer* renderer, ID2D1Factory* direct2dFactory, HDC hdc, const wxSize& dcSize,
+    // Create the context for the given HDC which may be associated (if it's
+    // non-null) with the given wxDC.
+    wxD2DContext(wxGraphicsRenderer* renderer,
+                 ID2D1Factory* direct2dFactory,
+                 HDC hdc,
+                 const wxDC* dc = NULL,
                  D2D1_ALPHA_MODE alphaMode = D2D1_ALPHA_MODE_IGNORE);
 
 #if wxUSE_IMAGE
@@ -3612,8 +3622,11 @@ private:
 // wxD2DContext implementation
 //-----------------------------------------------------------------------------
 
-wxD2DContext::wxD2DContext(wxGraphicsRenderer* renderer, ID2D1Factory* direct2dFactory, HWND hwnd) :
+wxD2DContext::wxD2DContext(wxGraphicsRenderer* renderer,
-    wxGraphicsContext(renderer), m_direct2dFactory(direct2dFactory),
+                           ID2D1Factory* direct2dFactory,
+                           HWND hwnd,
+                           wxWindow* window) :
+    wxGraphicsContext(renderer, window), m_direct2dFactory(direct2dFactory),
 #if wxD2D_DEVICE_CONTEXT_SUPPORTED
     m_renderTargetHolder(new wxD2DDeviceContextResourceHolder(direct2dFactory, hwnd))
 #else
@@ -3626,13 +3639,21 @@ wxD2DContext::wxD2DContext(wxGraphicsRenderer* renderer, ID2D1Factory* direct2dF
     Init();
 }
 
-wxD2DContext::wxD2DContext(wxGraphicsRenderer* renderer, ID2D1Factory* direct2dFactory, HDC hdc,
+wxD2DContext::wxD2DContext(wxGraphicsRenderer* renderer,
-                           const wxSize& dcSize, D2D1_ALPHA_MODE alphaMode) :
+                           ID2D1Factory* direct2dFactory,
-    wxGraphicsContext(renderer), m_direct2dFactory(direct2dFactory),
+                           HDC hdc,
+                           const wxDC* dc,
+                           D2D1_ALPHA_MODE alphaMode) :
+    wxGraphicsContext(renderer, dc->GetWindow()), m_direct2dFactory(direct2dFactory),
     m_renderTargetHolder(new wxD2DDCRenderTargetResourceHolder(direct2dFactory, hdc, alphaMode))
 {
+    if ( dc )
+    {
+        const wxSize dcSize = dc->GetSize();
         m_width = dcSize.GetWidth();
         m_height = dcSize.GetHeight();
+    }
+
     Init();
 }
 
@@ -4593,7 +4614,7 @@ wxD2DRenderer::~wxD2DRenderer()
 
 wxGraphicsContext* wxD2DRenderer::CreateContext(const wxWindowDC& dc)
 {
-    return new wxD2DContext(this, m_direct2dFactory, dc.GetHDC(), dc.GetSize());
+    return new wxD2DContext(this, m_direct2dFactory, dc.GetHDC(), &dc);
 }
 
 wxGraphicsContext* wxD2DRenderer::CreateContext(const wxMemoryDC& dc)
@@ -4601,7 +4622,7 @@ wxGraphicsContext* wxD2DRenderer::CreateContext(const wxMemoryDC& dc)
     wxBitmap bmp = dc.GetSelectedBitmap();
     wxASSERT_MSG( bmp.IsOk(), wxS("Should select a bitmap before creating wxGraphicsContext") );
 
-    return new wxD2DContext(this, m_direct2dFactory, dc.GetHDC(), dc.GetSize(),
+    return new wxD2DContext(this, m_direct2dFactory, dc.GetHDC(), &dc,
                             bmp.HasAlpha() ? D2D1_ALPHA_MODE_PREMULTIPLIED : D2D1_ALPHA_MODE_IGNORE);
 }
 
@@ -4633,12 +4654,12 @@ wxGraphicsContext* wxD2DRenderer::CreateContextFromNativeWindow(void* window)
 
 wxGraphicsContext* wxD2DRenderer::CreateContextFromNativeHDC(WXHDC dc)
 {
-    return new wxD2DContext(this, m_direct2dFactory, (HDC)dc, wxSize(0, 0));
+    return new wxD2DContext(this, m_direct2dFactory, (HDC)dc);
 }
 
 wxGraphicsContext* wxD2DRenderer::CreateContext(wxWindow* window)
 {
-    return new wxD2DContext(this, m_direct2dFactory, (HWND)window->GetHWND());
+    return new wxD2DContext(this, m_direct2dFactory, (HWND)window->GetHWND(), window);
 }
 
 #if wxUSE_IMAGE

src/msw/msgdlg.cpp

@@ -162,10 +162,7 @@ wxMessageDialog::HookFunction(int code, WXWPARAM wParam, WXLPARAM lParam)
 void wxMessageDialog::ReplaceStaticWithEdit()
 {
     // check if the message box fits the display
-    int nDisplay = wxDisplay::GetFromWindow(this);
+    const wxRect rectDisplay = wxDisplay(this).GetClientArea();
-    if ( nDisplay == wxNOT_FOUND )
-        nDisplay = 0;
-    const wxRect rectDisplay = wxDisplay(nDisplay).GetClientArea();
 
     if ( rectDisplay.Contains(GetRect()) )
     {

src/msw/toplevel.cpp

@@ -756,8 +756,7 @@ void wxTopLevelWindowMSW::DoGetPosition(int *x, int *y) const
             {
                 // we must use the correct display for the translation as the
                 // task bar might be shown on one display but not the other one
-                int n = wxDisplay::GetFromWindow(this);
+                wxDisplay dpy(this);
-                wxDisplay dpy(n == wxNOT_FOUND ? 0 : n);
                 const wxPoint ptOfs = dpy.GetClientArea().GetPosition() -
                                       dpy.GetGeometry().GetPosition();
 
@@ -916,11 +915,7 @@ bool wxTopLevelWindowMSW::ShowFullScreen(bool show, long style)
 
         // resize to the size of the display containing us, falling back to the
         // primary one
-        int dpy = wxDisplay::GetFromWindow(this);
+        const wxRect rect = wxDisplay(this).GetGeometry();
-        if ( dpy == wxNOT_FOUND )
-            dpy = 0;
-
-        const wxRect rect = wxDisplay(dpy).GetGeometry();
 
         SetSize(rect);
 

src/osx/carbon/graphics.cpp

@@ -1303,7 +1303,11 @@ bool wxMacCoreGraphicsPathData::Contains( wxDouble x, wxDouble y, wxPolygonFillM
 class WXDLLEXPORT wxMacCoreGraphicsContext : public wxGraphicsContext
 {
 public:
-    wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, CGContextRef cgcontext, wxDouble width = 0, wxDouble height = 0 );
+    wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer,
+                              CGContextRef cgcontext,
+                              wxDouble width = 0,
+                              wxDouble height = 0,
+                              wxWindow* window = NULL );
 
     wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, wxWindow* window );
 
@@ -1509,7 +1513,12 @@ void wxMacCoreGraphicsContext::Init()
     m_interpolation = wxINTERPOLATION_DEFAULT;
 }
 
-wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, CGContextRef cgcontext, wxDouble width, wxDouble height ) : wxGraphicsContext(renderer)
+wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer,
+                                                    CGContextRef cgcontext,
+                                                    wxDouble width,
+                                                    wxDouble height,
+                                                    wxWindow* window )
+    : wxGraphicsContext(renderer, window)
 {
     Init();
     SetNativeContext(cgcontext);
@@ -1518,7 +1527,9 @@ wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer
     m_initTransform = m_cgContext ? CGContextGetCTM(m_cgContext) : CGAffineTransformIdentity;
 }
 
-wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, wxWindow* window ): wxGraphicsContext(renderer)
+wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer,
+                                                    wxWindow* window )
+    : wxGraphicsContext(renderer, window)
 {
     Init();
 
@@ -2694,26 +2705,18 @@ wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
 
 wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateContext( const wxWindowDC& dc )
 {
-    const wxDCImpl* impl = dc.GetImpl();
+    wxWindow* const win = dc.GetWindow();
-    wxWindowDCImpl *win_impl = wxDynamicCast( impl, wxWindowDCImpl );
+    wxCHECK_MSG( win, NULL, "Invalid wxWindowDC" );
-    if (win_impl)
-    {
-        int w, h;
-        win_impl->GetSize( &w, &h );
-        CGContextRef cgctx = 0;
 
-        wxASSERT_MSG(win_impl->GetWindow(), "Invalid wxWindow in wxMacCoreGraphicsRenderer::CreateContext");
+    const wxSize sz = win->GetSize();
-        if (win_impl->GetWindow())
-            cgctx =  (CGContextRef)(win_impl->GetWindow()->MacGetCGContextRef());
 
     // having a cgctx being NULL is fine (will be created on demand)
     // this is the case for all wxWindowDCs except wxPaintDC
+    CGContextRef cgctx = (CGContextRef)(win->MacGetCGContextRef());
     wxMacCoreGraphicsContext *context =
-            new wxMacCoreGraphicsContext( this, cgctx, (wxDouble) w, (wxDouble) h );
+        new wxMacCoreGraphicsContext( this, cgctx, sz.x, sz.y, win );
     context->EnableOffset(dc.GetContentScaleFactor() < 2);
     return context;
-    }
-    return NULL;
 }
 
 wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateContext( const wxMemoryDC& dc )

src/stc/PlatWX.cpp

@@ -1861,8 +1861,7 @@ void Window::SetPositionRelative(PRectangle rc, Window relativeTo) {
     position.x = wxRound(position.x + rc.left);
     position.y = wxRound(position.y + rc.top);
 
-    const int currentDisplay = wxDisplay::GetFromWindow(relativeWin);
+    const wxRect displayRect = wxDisplay(relativeWin).GetClientArea();
-    const wxRect displayRect = wxDisplay(currentDisplay).GetClientArea();
 
     if (position.x < displayRect.GetLeft())
         position.x = displayRect.GetLeft();