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[wxWidgets.git] / include / wx / dcbuffer.h

diff --git a/include/wx/dcbuffer.h b/include/wx/dcbuffer.h
index 85f5f6cef4696d98c8e8342b06dcc6a21c0b2905..203f7cd1a38c93a7aef6be8c9718a7caf3fe71e2 100644 (file)
--- a/include/wx/dcbuffer.h
+++ b/include/wx/dcbuffer.h
@@ -18,7 +18,7 @@
 
 // Split platforms into two groups - those which have well-working
 // double-buffering by default, and those which do not.
 
 // Split platforms into two groups - those which have well-working
 // double-buffering by default, and those which do not.

-#if defined(__WXMAC__) || defined(__WXGTK20__)
+#if defined(__WXMAC__) || defined(__WXGTK20__) || defined(__WXDFB__)

     #define wxALWAYS_NATIVE_DOUBLE_BUFFER       1
 #else
     #define wxALWAYS_NATIVE_DOUBLE_BUFFER       0
     #define wxALWAYS_NATIVE_DOUBLE_BUFFER       1
 #else
     #define wxALWAYS_NATIVE_DOUBLE_BUFFER       0


@@ -37,62 +37,63 @@
 // does not prepare the window DC
 #define wxBUFFER_CLIENT_AREA        0x02
 
 // does not prepare the window DC
 #define wxBUFFER_CLIENT_AREA        0x02
 

-class WXDLLEXPORT wxBufferedDC : public wxMemoryDC
+// Set when not using specific buffer bitmap. Note that this
+// is private style and not returned by GetStyle.
+#define wxBUFFER_USES_SHARED_BUFFER 0x04
+
+class WXDLLIMPEXP_CORE wxBufferedDC : public wxMemoryDC

 {
 public:
     // Default ctor, must subsequently call Init for two stage construction.
 {
 public:
     // Default ctor, must subsequently call Init for two stage construction.

-    wxBufferedDC() : m_dc( 0 ), m_style(0)
+    wxBufferedDC()
+        : m_dc(NULL),
+          m_buffer(NULL),
+          m_style(0)

     {
     }
 
     // Construct a wxBufferedDC using a user supplied buffer.
     wxBufferedDC(wxDC *dc,
     {
     }
 
     // Construct a wxBufferedDC using a user supplied buffer.
     wxBufferedDC(wxDC *dc,

-                 const wxBitmap &buffer = wxNullBitmap,
+                 wxBitmap& buffer = wxNullBitmap,

                  int style = wxBUFFER_CLIENT_AREA)
                  int style = wxBUFFER_CLIENT_AREA)

-        : m_dc( dc ),
-          m_buffer( buffer ),
-          m_style(style)
+        : m_dc(NULL), m_buffer(NULL)

     {
     {

-        UseBuffer();
+        Init(dc, buffer, style);

     }
 
     // Construct a wxBufferedDC with an internal buffer of 'area'
     // (where area is usually something like the size of the window
     // being buffered)
     }
 
     // Construct a wxBufferedDC with an internal buffer of 'area'
     // (where area is usually something like the size of the window
     // being buffered)

-    wxBufferedDC(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
-        : m_dc( dc ),
-          m_buffer( area.GetWidth(), area.GetHeight() ),
-          m_style(style)
-
+    wxBufferedDC(wxDC *dc, const wxSize& area, int style = wxBUFFER_CLIENT_AREA)
+        : m_dc(NULL), m_buffer(NULL)

     {
     {

-        UseBuffer();
+        Init(dc, area, style);

     }
 
     }
 

-    // default copy ctor ok.
-

     // The usually desired  action in the dtor is to blit the buffer.
     virtual ~wxBufferedDC()
     {
     // The usually desired  action in the dtor is to blit the buffer.
     virtual ~wxBufferedDC()
     {

-        if ( m_dc ) UnMask();
+        if ( m_dc )
+            UnMask();

     }
 
     }
 

-    // These reimplement the actions of the ctors for two stage creation, but
-    // are not used by the ctors themselves to save a few cpu cycles.
+    // These reimplement the actions of the ctors for two stage creation

     void Init(wxDC *dc,
     void Init(wxDC *dc,

-              const wxBitmap &buffer=wxNullBitmap,
+              wxBitmap& buffer = wxNullBitmap,

               int style = wxBUFFER_CLIENT_AREA)
     {
               int style = wxBUFFER_CLIENT_AREA)
     {

-        wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
-                      _T("wxBufferedDC already initialised") );
-        m_dc = dc;
-        m_buffer = buffer;
-        m_style = style;
+        InitCommon(dc, style);
+
+        m_buffer = &buffer;
+

         UseBuffer();
     }
 
     void Init(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
     {
         UseBuffer();
     }
 
     void Init(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
     {

-        Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()), style);
+        InitCommon(dc, style);
+
+        UseBuffer(area.x, area.y);

     }
 
     // Blits the buffer to the dc, and detaches the dc from the buffer (so it
     }
 
     // Blits the buffer to the dc, and detaches the dc from the buffer (so it


@@ -101,40 +102,29 @@ public:
     // Usually called in the dtor or by the dtor of derived classes if the
     // BufferedDC must blit before the derived class (which may own the dc it's
     // blitting to) is destroyed.
     // Usually called in the dtor or by the dtor of derived classes if the
     // BufferedDC must blit before the derived class (which may own the dc it's
     // blitting to) is destroyed.

-    void UnMask()
-    {
-        wxASSERT_MSG( m_dc != 0,
-                      _T("No underlying DC associated with wxBufferedDC (anymore)") );
-
-        wxCoord x=0, y=0;
-
-        if (m_style & wxBUFFER_CLIENT_AREA)
-            GetDeviceOrigin(&x, &y);
-
-        m_dc->Blit( 0, 0,
-                    m_buffer.GetWidth(), m_buffer.GetHeight(), this,
-                    -x, -y );
-        m_dc = NULL;
-    }
+    void UnMask();

 
     // Set and get the style
     void SetStyle(int style) { m_style = style; }
 
     // Set and get the style
     void SetStyle(int style) { m_style = style; }

-    int GetStyle() const { return m_style; }
+    int GetStyle() const { return m_style & ~wxBUFFER_USES_SHARED_BUFFER; }

 
 private:
 
 private:

-    // check that the bitmap is valid and use it
-    void UseBuffer()
+    // common part of Init()s
+    void InitCommon(wxDC *dc, int style)

     {
     {

-        if (!m_buffer.Ok())
-        {
-            wxCoord w, h;
-            m_dc->GetSize(&w, &h);
-            m_buffer = wxBitmap(w, h);
-        }
-
-        SelectObject(m_buffer);
+        wxASSERT_MSG( !m_dc, _T("wxBufferedDC already initialised") );
+
+        m_dc = dc;
+        m_style = style;
+
+        // inherit the same layout direction as the original DC
+        if (dc && dc->IsOk())
+            SetLayoutDirection(dc->GetLayoutDirection());

     }
 
     }
 

+    // check that the bitmap is valid and use it
+    void UseBuffer(wxCoord w = -1, wxCoord h = -1);
+

     // the underlying DC to which we copy everything drawn on this one in
     // UnMask()
     //
     // the underlying DC to which we copy everything drawn on this one in
     // UnMask()
     //


@@ -142,8 +132,8 @@ private:
     //     could probably be a reference.
     wxDC *m_dc;
 
     //     could probably be a reference.
     wxDC *m_dc;
 

-    // the buffer (selected in this DC)
-    wxBitmap m_buffer;
+    // the buffer (selected in this DC), initially invalid
+    wxBitmap *m_buffer;

 
     // the buffering style
     int m_style;
 
     // the buffering style
     int m_style;


@@ -159,21 +149,21 @@ private:
 
 // Creates a double buffered wxPaintDC, optionally allowing the
 // user to specify their own buffer to use.
 
 // Creates a double buffered wxPaintDC, optionally allowing the
 // user to specify their own buffer to use.

-class WXDLLEXPORT wxBufferedPaintDC : public wxBufferedDC
+class WXDLLIMPEXP_CORE wxBufferedPaintDC : public wxBufferedDC

 {
 public:
     // If no bitmap is supplied by the user, a temporary one will be created.
 {
 public:
     // If no bitmap is supplied by the user, a temporary one will be created.

-    wxBufferedPaintDC(wxWindow *window, const wxBitmap& buffer, int style = wxBUFFER_CLIENT_AREA)
+    wxBufferedPaintDC(wxWindow *window, wxBitmap& buffer, int style = wxBUFFER_CLIENT_AREA)

         : m_paintdc(window)
     {
         // If we're buffering the virtual window, scale the paint DC as well
         if (style & wxBUFFER_VIRTUAL_AREA)
             window->PrepareDC( m_paintdc );
 
         : m_paintdc(window)
     {
         // If we're buffering the virtual window, scale the paint DC as well
         if (style & wxBUFFER_VIRTUAL_AREA)
             window->PrepareDC( m_paintdc );
 

-        if( buffer != wxNullBitmap )
+        if( buffer.IsOk() )

             Init(&m_paintdc, buffer, style);
         else
             Init(&m_paintdc, buffer, style);
         else

-            Init(&m_paintdc, window->GetClientSize(), style);
+            Init(&m_paintdc, GetBufferedSize(window, style), style);

     }
 
     // If no bitmap is supplied by the user, a temporary one will be created.
     }
 
     // If no bitmap is supplied by the user, a temporary one will be created.


@@ -184,7 +174,7 @@ public:
         if (style & wxBUFFER_VIRTUAL_AREA)
             window->PrepareDC( m_paintdc );
 
         if (style & wxBUFFER_VIRTUAL_AREA)
             window->PrepareDC( m_paintdc );
 

-        Init(&m_paintdc, window->GetClientSize(), style);
+        Init(&m_paintdc, GetBufferedSize(window, style), style);

     }
 
     // default copy ctor ok.
     }
 
     // default copy ctor ok.


@@ -196,6 +186,15 @@ public:
         UnMask();
     }
 
         UnMask();
     }
 

+protected:
+    // return the size needed by the buffer: this depends on whether we're
+    // buffering just the currently shown part or the total (scrolled) window
+    static wxSize GetBufferedSize(wxWindow *window, int style)
+    {
+        return style & wxBUFFER_VIRTUAL_AREA ? window->GetVirtualSize()
+                                             : window->GetClientSize();
+    }
+

 private:
     wxPaintDC m_paintdc;
 
 private:
     wxPaintDC m_paintdc;
 


@@ -220,7 +219,7 @@ private:
 
 #ifdef __WXDEBUG__
 
 
 #ifdef __WXDEBUG__
 

-class wxAutoBufferedPaintDC : public wxAutoBufferedPaintDCBase
+class WXDLLIMPEXP_CORE wxAutoBufferedPaintDC : public wxAutoBufferedPaintDCBase

 {
 public:
 
 {
 public:
 


@@ -238,7 +237,7 @@ private:
     {
         // Help the user to get the double-buffering working properly.
         wxASSERT_MSG( win->GetBackgroundStyle() == wxBG_STYLE_CUSTOM,
     {
         // Help the user to get the double-buffering working properly.
         wxASSERT_MSG( win->GetBackgroundStyle() == wxBG_STYLE_CUSTOM,

-                      wxT("In constructor, you need to call GetBackgroundStyle(wxBG_STYLE_CUSTOM), ")
+                      wxT("In constructor, you need to call SetBackgroundStyle(wxBG_STYLE_CUSTOM), ")

                       wxT("and also, if needed, paint the background manually in the paint event handler."));
     }
 
                       wxT("and also, if needed, paint the background manually in the paint event handler."));
     }
 


@@ -263,6 +262,5 @@ inline wxDC* wxAutoBufferedPaintDCFactory(wxWindow* window)
     else
         return new wxBufferedPaintDC(window);
 }
     else
         return new wxBufferedPaintDC(window);
 }

-            

 
 #endif  // _WX_DCBUFFER_H_
 
 #endif  // _WX_DCBUFFER_H_