Bug 583053 - Corruption issues when running rdio because windows double-pass rendering events don't win the RPC race, r=bent

dom/plugins/PluginInstanceChild.cpp

@@ -86,8 +86,6 @@ using mozilla::gfx::SharedDIB;
 // helpers' section for details.
 const int kFlashWMUSERMessageThrottleDelayMs = 5;
 
-#define NS_OOPP_DOUBLEPASS_MSGID TEXT("MozDoublePassMsg")
-
 #elif defined(XP_MACOSX)
 #include <ApplicationServices/ApplicationServices.h>
 #endif // defined(XP_MACOSX)
@@ -125,7 +123,6 @@ PluginInstanceChild::PluginInstanceChild(const NPPluginFuncs* aPluginIface,
 #endif // MOZ_X11 && XP_UNIX && !XP_MACOSX
 #if defined(OS_WIN)
     memset(&mAlphaExtract, 0, sizeof(mAlphaExtract));
-    mAlphaExtract.doublePassEvent = ::RegisterWindowMessage(NS_OOPP_DOUBLEPASS_MSGID);
 #endif // OS_WIN
     InitQuirksModes(aMimeType);
 #if defined(OS_WIN)
@@ -565,7 +562,7 @@ PluginInstanceChild::AnswerNPP_HandleEvent(const NPRemoteEvent& event,
           *handled = SharedSurfacePaint(evcopy);
           return true;
        }
-       else if (evcopy.event == mAlphaExtract.doublePassEvent) {
+       else if (DoublePassRenderingEvent() == evcopy.event) {
             // We'll render to mSharedSurfaceDib first, then render to a cached bitmap
             // we store locally. The two passes are for alpha extraction, so the second
             // pass must be to a flat white surface in order for things to work.

dom/plugins/PluginInstanceChild.h

@@ -352,7 +352,6 @@ private:
     };
     gfx::SharedDIBWin mSharedSurfaceDib;
     struct {
-      PRUint32        doublePassEvent;
       PRUint16        doublePass;
       HDC             hdc;
       HBITMAP         bmp;

dom/plugins/PluginInstanceParent.cpp

@@ -638,7 +638,12 @@ PluginInstanceParent::NPP_HandleEvent(void* event)
 
 #if defined(OS_WIN)
     if (mWindowType == NPWindowTypeDrawable) {
-        switch(npevent->event) {
+        if (DoublePassRenderingEvent() == npevent->event) {
+            CallPaint(npremoteevent, &handled);
+            return handled;
+        }
+
+        switch (npevent->event) {
             case WM_PAINT:
             {
                 RECT rect;

dom/plugins/PluginMessageUtils.cpp

@@ -162,5 +162,18 @@ void DeferNPVariantLastRelease(const NPNetscapeFuncs* f, NPVariant* v)
   VOID_TO_NPVARIANT(*v);
 }
 
+#ifdef XP_WIN
+
+// The private event used for double-pass widgetless plugin rendering.
+UINT DoublePassRenderingEvent()
+{
+  static UINT gEventID = 0;
+  if (!gEventID)
+    gEventID = ::RegisterWindowMessage(L"MozDoublePassMsg");
+  return gEventID;
+}
+
+#endif
+
 } // namespace plugins
 } // namespace mozilla

dom/plugins/PluginMessageUtils.h

@@ -271,6 +271,11 @@ struct DeletingObjectEntry : public nsPtrHashKey<NPObject>
   bool mDeleted;
 };
 
+#ifdef XP_WIN
+// The private event used for double-pass widgetless plugin rendering.
+UINT DoublePassRenderingEvent();
+#endif
+
 } /* namespace plugins */
 
 } /* namespace mozilla */

layout/generic/Makefile.in

@@ -144,6 +144,8 @@ RESOURCES_HTML = \
 
 FORCE_STATIC_LIB = 1
 
+include $(topsrcdir)/config/config.mk
+include $(topsrcdir)/ipc/chromium/chromium-config.mk
 include $(topsrcdir)/config/rules.mk
 
 LOCAL_INCLUDES += \

layout/generic/nsObjectFrame.cpp

@@ -46,6 +46,10 @@
 
 /* rendering objects for replaced elements implemented by a plugin */
 
+#ifdef MOZ_IPC
+#include "mozilla/plugins/PluginMessageUtils.h"
+#endif
+
 #ifdef MOZ_WIDGET_QT
 #include <QWidget>
 #include <QKeyEvent>
@@ -207,9 +211,6 @@ using mozilla::DefaultXDisplay;
 #ifdef XP_WIN
 #include <wtypes.h>
 #include <winuser.h>
-#ifdef MOZ_IPC
-#define NS_OOPP_DOUBLEPASS_MSGID TEXT("MozDoublePassMsg")
-#endif
 #endif
 
 #ifdef XP_OS2
@@ -624,10 +625,6 @@ nsObjectFrame::Init(nsIContent*      aContent,
 
   nsresult rv = nsObjectFrameSuper::Init(aContent, aParent, aPrevInFlow);
 
-#ifdef XP_WIN
-  mDoublePassEvent = 0;
-#endif
-
   return rv;
 }
 
@@ -1726,15 +1723,12 @@ nsObjectFrame::PaintPlugin(nsIRenderingContext& aRenderingContext,
         // OOP plugin specific: let the shim know before we paint if we are doing a
         // double pass render. If this plugin isn't oop, the register window message
         // will be ignored.
-        if (!mDoublePassEvent)
-          mDoublePassEvent = ::RegisterWindowMessage(NS_OOPP_DOUBLEPASS_MSGID);
-        if (mDoublePassEvent) {
-          NPEvent pluginEvent;
-          pluginEvent.event = mDoublePassEvent;
-          pluginEvent.wParam = 0;
-          pluginEvent.lParam = 0;
+        NPEvent pluginEvent;
+        pluginEvent.event = mozilla::plugins::DoublePassRenderingEvent();
+        pluginEvent.wParam = 0;
+        pluginEvent.lParam = 0;
+        if (pluginEvent.event)
           inst->HandleEvent(&pluginEvent, nsnull);
-        }
       }
 #endif
       do {

layout/generic/nsObjectFrame.h

@@ -252,9 +252,6 @@ private:
   nsIView*                        mInnerView;
   nsCOMPtr<nsIWidget>             mWidget;
   nsIntRect                       mWindowlessRect;
-#ifdef XP_WIN
-  PRUint32                        mDoublePassEvent;
-#endif
 
   // For assertions that make it easier to determine if a crash is due
   // to the underlying problem described in bug 136927, and to prevent