1 files changed, 55 insertions, 2 deletions
diff --git a/wx+/rtl.h b/wx+/rtl.h
index f89bb86e..84009a86 100644
--- a/wx+/rtl.h
+++ b/wx+/rtl.h
@@ -13,6 +13,7 @@
 #include <wx/image.h>
 #include <wx/icon.h>
 #include <wx/app.h>
+#include <wx/dcbuffer.h> //for macro: wxALWAYS_NATIVE_DOUBLE_BUFFER
 
 namespace zen
 {
@@ -30,15 +31,25 @@ void drawBitmapRtlNoMirror(wxDC& dc,  //wxDC::DrawLabel does already NOT mirror
                            int alignment,
                            std::unique_ptr<wxBitmap>& buffer);
 
-void drawIconRtlNoMirror(wxDC& dc,
-                         const wxIcon& icon, //wxDC::DrawIcon DOES mirror by default
+void drawIconRtlNoMirror(wxDC& dc, //wxDC::DrawIcon DOES mirror by default
+                         const wxIcon& icon,
                          const wxPoint& pt,
                          std::unique_ptr<wxBitmap>& buffer);
 
 wxBitmap mirrorIfRtl(const wxBitmap& bmp);
 
 
+/*
+class BufferedPaintDC
+{
+public:
+    BufferedPaintDC(wxWindow& wnd, std::unique_ptr<wxBitmap>& buffer);
+};
+*/
+//a fix for a poor wxWidgets implementation (wxAutoBufferedPaintDC skips one pixel on left side when RTL layout is active)
+
 
+//manual text flow correction: http://www.w3.org/International/articles/inline-bidi-markup/
 
 
 
@@ -116,6 +127,48 @@ wxBitmap mirrorIfRtl(const wxBitmap& bmp)
     else
         return bmp;
 }
+
+
+#ifndef wxALWAYS_NATIVE_DOUBLE_BUFFER
+#error we need this one!
+#endif
+
+#if wxALWAYS_NATIVE_DOUBLE_BUFFER
+struct BufferedPaintDC : public wxPaintDC { BufferedPaintDC(wxWindow& wnd, std::unique_ptr<wxBitmap>& buffer) : wxPaintDC(&wnd) {} };
+
+#else
+class BufferedPaintDC : public wxMemoryDC
+{
+public:
+    BufferedPaintDC(wxWindow& wnd, std::unique_ptr<wxBitmap>& buffer) : buffer_(buffer), paintDc(&wnd)
+    {
+        const wxSize clientSize = wnd.GetClientSize();
+        if (!buffer_ || clientSize != wxSize(buffer->GetWidth(), buffer->GetHeight()))
+            buffer.reset(new wxBitmap(clientSize.GetWidth(), clientSize.GetHeight()));
+
+        SelectObject(*buffer);
+
+        if (paintDc.IsOk() && paintDc.GetLayoutDirection() == wxLayout_RightToLeft)
+            SetLayoutDirection(wxLayout_RightToLeft);
+    }
+
+    ~BufferedPaintDC()
+    {
+        if (GetLayoutDirection() == wxLayout_RightToLeft)
+        {
+            paintDc.SetLayoutDirection(wxLayout_LeftToRight); //workaround bug in wxDC::Blit()
+            SetLayoutDirection(wxLayout_LeftToRight);         //
+        }
+
+        const wxPoint origin = GetDeviceOrigin();
+        paintDc.Blit(0, 0, buffer_->GetWidth(), buffer_->GetHeight(), this, -origin.x, -origin.y);
+    }
+
+private:
+    std::unique_ptr<wxBitmap>& buffer_;
+    wxPaintDC paintDc;
+};
+#endif
 }
 
 #endif //RTL_H_0183487180058718273432148