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lightning-sunbird  0.9+nobinonly
nsToolkit.cpp
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00037 
00038 #include "nscore.h" // needed for 'nsnull'
00039 #include "xlibrgb.h"
00040 #include "nsToolkit.h"
00041 #include "nsGCCache.h"
00042 #include "nsAppShell.h" // needed for nsAppShell::GetXlibRgbHandle()
00043 
00044 // Static Thread Local Storage index of the toolkit object associated with
00045 // a given thread...
00046 static PRUintn gToolkitTLSIndex = 0;
00047 
00048 nsToolkit::nsToolkit()
00049 {
00050   mGC = nsnull;
00051   mDisplay = xxlib_rgb_get_display(nsAppShell::GetXlibRgbHandle());
00052 }
00053 
00054 nsToolkit::~nsToolkit()
00055 {
00056   if (mGC)
00057     mGC->Release();
00058 
00059   // Remove the TLS reference to the toolkit...
00060   PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
00061 }
00062 
00063 NS_IMPL_ISUPPORTS1(nsToolkit, nsIToolkit)
00064 
00065 void nsToolkit::CreateSharedGC()
00066 {
00067   if (mGC)
00068     return;
00069 
00070   mGC = new xGC(mDisplay, XDefaultRootWindow(mDisplay), 0, nsnull);
00071   mGC->AddRef(); // this is for us
00072 }
00073 
00074 xGC *nsToolkit::GetSharedGC()
00075 {
00076   if (!mGC)
00077     CreateSharedGC();
00078 
00079   mGC->AddRef();
00080   return mGC;
00081 }
00082 
00083 NS_METHOD nsToolkit::Init(PRThread *aThread)
00084 {
00085   CreateSharedGC();
00086 
00087   return NS_OK;
00088 }
00089 
00090 NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
00091 {
00092   nsIToolkit* toolkit = nsnull;
00093   nsresult rv = NS_OK;
00094   PRStatus status;
00095 
00096   // Create the TLS (Thread Local Storage) index the first time through
00097   if (gToolkitTLSIndex == 0)
00098   {
00099     status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, nsnull);
00100     if (PR_FAILURE == status)
00101     {
00102       rv = NS_ERROR_FAILURE;
00103     }
00104   }
00105 
00106   if (NS_SUCCEEDED(rv))
00107   {
00108     toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);
00109 
00110     //
00111     // Create a new toolkit for this thread...
00112     //
00113     if (!toolkit) {
00114       toolkit = new nsToolkit();
00115       
00116       if (!toolkit) {
00117         rv = NS_ERROR_OUT_OF_MEMORY;
00118       } else {
00119         NS_ADDREF(toolkit);
00120         toolkit->Init(PR_GetCurrentThread());
00121         //
00122         // The reference stored in the TLS is weak.  It is removed in the
00123         // nsToolkit destructor...
00124         //
00125         PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
00126       }
00127     } else {
00128       NS_ADDREF(toolkit);
00129     }
00130     *aResult = toolkit;
00131   }
00132   return rv;
00133 }