Added SetOption,GetOption[Int] to wxSystemSettings. Made native MaskBlt optional.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10563 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/settings.h

@@ -32,6 +32,16 @@ public:
 
     // Get a system metric, e.g. scrollbar size
     static int GetSystemMetric(int index);
+
+    // User-customizable hints to wxWindows or associated libraries
+    // These could also be used to influence GetSystem... calls, indeed
+    // to implement SetSystemColour/Font/Metric
+
+    static void SetOption(const wxString& name, const wxString& value);
+    static void SetOption(const wxString& name, int value);
+    static wxString GetOption(const wxString& name) ;
+    static int GetOptionInt(const wxString& name) ;
+    static bool HasOption(const wxString& name) ;
 };
 
 #endif

src/msw/dc.cpp

@@ -781,16 +781,23 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
     if ( useMask )
     {
 #ifdef __WIN32__
-        HDC hdcMem = ::CreateCompatibleDC(GetHdc());
-        ::SelectObject(hdcMem, GetHbitmapOf(bmp));
-
         // use MaskBlt() with ROP which doesn't do anything to dst in the mask
         // points
-        bool ok = ::MaskBlt(GetHdc(), x, y, width, height,
+        // On some systems, MaskBlt succeeds yet is much much slower
+        // than the wxWindows fall-back implementation. So we need
+        // to be able to switch this on and off at runtime.
+        bool ok = FALSE;
+        if (wxSystemSettings::GetOptionInt(wxT("no-maskblt")) == 0)
+        {
+            HDC hdcMem = ::CreateCompatibleDC(GetHdc());
+            ::SelectObject(hdcMem, GetHbitmapOf(bmp));
+
+            ok = ::MaskBlt(GetHdc(), x, y, width, height,
                             hdcMem, 0, 0,
                             hbmpMask, 0, 0,
                             MAKEROP4(SRCCOPY, DSTCOPY)) != 0;
-        ::DeleteDC(hdcMem);
+            ::DeleteDC(hdcMem);
+        }
 
         if ( !ok )
 #endif // Win32
@@ -1471,7 +1478,7 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
            return FALSE;
     }
 
-    bool success;
+    bool success = FALSE;
 
     if (useMask)
     {
@@ -1480,10 +1487,17 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
         // transparent, so use "DSTCOPY" ROP for the mask points (the usual
         // meaning of fg and bg is inverted which corresponds to wxWin notion
         // of the mask which is also contrary to the Windows one)
-        success = ::MaskBlt(GetHdc(), xdest, ydest, width, height,
+
+        // On some systems, MaskBlt succeeds yet is much much slower
+        // than the wxWindows fall-back implementation. So we need
+        // to be able to switch this on and off at runtime.
+        if (wxSystemSettings::GetOptionInt(wxT("no-maskblt")) == 0)
+        {
+           success = ::MaskBlt(GetHdc(), xdest, ydest, width, height,
                             GetHdcOf(*source), xsrc, ysrc,
                             (HBITMAP)mask->GetMaskBitmap(), xsrc, ysrc,
                             MAKEROP4(dwRop, DSTCOPY)) != 0;
+        }
 
         if ( !success )
 #endif // Win32

src/msw/settings.cpp

@@ -49,12 +49,16 @@
 // singleton class so it can't be done in the dtor)
 class wxSystemSettingsModule : public wxModule
 {
+    friend class wxSystemSettings;
 public:
     virtual bool OnInit();
     virtual void OnExit();
 
 private:
     DECLARE_DYNAMIC_CLASS(wxSystemSettingsModule)
+
+    static wxArrayString   sm_optionNames;
+    static wxArrayString   sm_optionValues;
 };
 
 // ----------------------------------------------------------------------------
@@ -73,6 +77,9 @@ static wxFont *gs_fontDefault = NULL;
 
 IMPLEMENT_DYNAMIC_CLASS(wxSystemSettingsModule, wxModule)
 
+wxArrayString wxSystemSettingsModule::sm_optionNames;
+wxArrayString wxSystemSettingsModule::sm_optionValues;
+
 bool wxSystemSettingsModule::OnInit()
 {
     return TRUE;
@@ -80,6 +87,8 @@ bool wxSystemSettingsModule::OnInit()
 
 void wxSystemSettingsModule::OnExit()
 {
+    sm_optionNames.Clear();
+    sm_optionValues.Clear();
     delete gs_fontDefault;
 }
 
@@ -243,3 +252,45 @@ int wxSystemSettings::GetSystemMetric(int index)
     }
 }
 
+// Option functions (arbitrary name/value mapping)
+void wxSystemSettings::SetOption(const wxString& name, const wxString& value)
+{
+    int idx = wxSystemSettingsModule::sm_optionNames.Index(name, FALSE);
+    if (idx == wxNOT_FOUND)
+    {
+        wxSystemSettingsModule::sm_optionNames.Add(name);
+        wxSystemSettingsModule::sm_optionValues.Add(value);
+    }
+    else
+    {
+        wxSystemSettingsModule::sm_optionNames[idx] = name;
+        wxSystemSettingsModule::sm_optionValues[idx] = value;
+    }
+}
+
+void wxSystemSettings::SetOption(const wxString& name, int value)
+{
+    wxString valStr;
+    valStr.Printf(wxT("%d"), value);
+    SetOption(name, valStr);
+}
+
+wxString wxSystemSettings::GetOption(const wxString& name)
+{
+    int idx = wxSystemSettingsModule::sm_optionNames.Index(name, FALSE);
+    if (idx == wxNOT_FOUND)
+        return wxEmptyString;
+    else
+        return wxSystemSettingsModule::sm_optionValues[idx];
+}
+
+int wxSystemSettings::GetOptionInt(const wxString& name)
+{
+    return wxAtoi(GetOption(name));
+}
+
+bool wxSystemSettings::HasOption(const wxString& name)
+{
+    return (wxSystemSettingsModule::sm_optionNames.Index(name, FALSE) != wxNOT_FOUND);
+}
+