Add a SetDoubleBuffered method for wxMSW (XP+)

[wxWidgets.git] / src / msw / mediactrl_am.cpp

diff --git a/src/msw/mediactrl_am.cpp b/src/msw/mediactrl_am.cpp
index be49d39044e3577c92dd88b4dbadece4da2a4408..5c8ed2cc35c455249b3876f1bc4cf7ba0e4d46ea 100644 (file)
--- a/src/msw/mediactrl_am.cpp
+++ b/src/msw/mediactrl_am.cpp
@@ -1483,6 +1483,7 @@ public:
     LPAMGETERRORTEXT m_lpAMGetErrorText;
     wxString GetErrorString(HRESULT hrdsv);
 #endif // __WXDEBUG__
+    wxEvtHandler* m_evthandler;
 
     friend class wxAMMediaEvtHandler;
     DECLARE_DYNAMIC_CLASS(wxAMMediaBackend)
@@ -1573,6 +1574,7 @@ wxAMMediaBackend::wxAMMediaBackend()
 #endif
                   m_bestSize(wxDefaultSize)
 {
+   m_evthandler = NULL;
 }
 
 //---------------------------------------------------------------------------
@@ -1591,7 +1593,11 @@ wxAMMediaBackend::~wxAMMediaBackend()
         if (GetMP())
             GetMP()->Release();
 
-        m_ctrl->PopEventHandler(true);
+        if (m_evthandler)
+        {
+            m_ctrl->RemoveEventHandler(m_evthandler);
+            delete m_evthandler;
+        }
     }
 }
 
@@ -1683,7 +1689,8 @@ bool wxAMMediaBackend::CreateControl(wxControl* ctrl, wxWindow* parent,
 #endif
                                   );
     // Connect for events
-    m_ctrl->PushEventHandler(new wxAMMediaEvtHandler(this));
+    m_evthandler = new wxAMMediaEvtHandler(this);
+    m_ctrl->PushEventHandler(m_evthandler);
 
     //
     //  Here we set up wx-specific stuff for the default
@@ -1949,12 +1956,12 @@ wxLongLong wxAMMediaBackend::GetPosition()
 }
 
 //---------------------------------------------------------------------------
-// wxAMMediaBackend::GetVolume
+// wxAMMediaBackend::GetVolume and SetVolume()
 //
-// Gets the volume through the IActiveMovie interface -
-// value ranges from 0 (MAX volume) to -10000 (minimum volume).
-// -100 per decibel (Logorithmic in 0.01db per step).
+// Notice that for the IActiveMovie interface value ranges from 0 (MAX volume)
+// to -10000 (minimum volume) and the scale is logarithmic in 0.01db per step.
 //---------------------------------------------------------------------------
+
 double wxAMMediaBackend::GetVolume()
 {
     long lVolume;
@@ -1965,37 +1972,20 @@ double wxAMMediaBackend::GetVolume()
         return 0.0;
     }
 
-    // Volume conversion from Greg Hazel
-    double dVolume = (double)lVolume / 125;
+    double dVolume = lVolume / 2000.; // volume is now in [-5..0] range
+    dVolume = pow(10.0, dVolume);     //                 [10^-5, 1]
+    dVolume -= 0.00001;               //                [0, 1-10^-5]
+    dVolume /= 1 - 0.00001;           //                   [0, 1]
 
-    // convert to 0 to 1
-    dVolume = pow(10.0, dVolume/20.0);
-    // handle -INF
-    dVolume *= 1 + pow(10.0, -5.0);
-    dVolume -= pow(10.0, -5.0);
     return dVolume;
 }
 
-//---------------------------------------------------------------------------
-// wxAMMediaBackend::SetVolume
-//
-// Sets the volume through the IActiveMovie interface -
-// value ranges from 0 (MAX volume) to -10000 (minimum volume).
-// -100 per decibel (Logorithmic in 0.01db per step).
-//---------------------------------------------------------------------------
 bool wxAMMediaBackend::SetVolume(double dVolume)
 {
-    // Volume conversion from Greg Hazel
-    long lVolume;
-    // handle -INF
-    dVolume *= 1 - pow(10.0, -5.0);
-    dVolume += pow(10.0, -5.0);
-    // convert to -100db to 0db
-    dVolume = 20 * log10(dVolume);
-    // scale to -10000 to 0
-    lVolume = (long)(125 * dVolume);
-
-    HRESULT hr = GetAM()->put_Volume( lVolume );
+    // inverse the transformation above
+    long lVolume = wx_static_cast(long, 2000*log10(dVolume + (1 - dVolume)*0.00001));
+
+    HRESULT hr = GetAM()->put_Volume(lVolume);
     if(FAILED(hr))
     {
         wxAMLOG(hr);