void
KeymapWrapper::InitBySystemSettings()
{
    PR_LOG(gKeymapWrapperLog, PR_LOG_ALWAYS,
      ("KeymapWrapper(%p): InitBySystemSettings, mGdkKeymap=%p",
       this, mGdkKeymap));

    Display* display =
        gdk_x11_display_get_xdisplay(gdk_display_get_default());

    int min_keycode = 0;
    int max_keycode = 0;
    XDisplayKeycodes(display, &min_keycode, &max_keycode);

    int keysyms_per_keycode = 0;
    KeySym* xkeymap = XGetKeyboardMapping(display, min_keycode,
                                          max_keycode - min_keycode + 1,
                                          &keysyms_per_keycode);
    if (!xkeymap) {
        PR_LOG(gKeymapWrapperLog, PR_LOG_ALWAYS,
            ("KeymapWrapper(%p): InitBySystemSettings, "
             "Failed due to null xkeymap", this));
        return;
    }

    XModifierKeymap* xmodmap = XGetModifierMapping(display);
    if (!xmodmap) {
        PR_LOG(gKeymapWrapperLog, PR_LOG_ALWAYS,
            ("KeymapWrapper(%p): InitBySystemSettings, "
             "Failed due to null xmodmap", this));
        XFree(xkeymap);
        return;
    }
    PR_LOG(gKeymapWrapperLog, PR_LOG_ALWAYS,
        ("KeymapWrapper(%p): InitBySystemSettings, min_keycode=%d, "
         "max_keycode=%d, keysyms_per_keycode=%d, max_keypermod=%d",
         this, min_keycode, max_keycode, keysyms_per_keycode,
         xmodmap->max_keypermod));

    // The modifiermap member of the XModifierKeymap structure contains 8 sets
    // of max_keypermod KeyCodes, one for each modifier in the order Shift,
    // Lock, Control, Mod1, Mod2, Mod3, Mod4, and Mod5.
    // Only nonzero KeyCodes have meaning in each set, and zero KeyCodes are
    // ignored.

    // Note that two or more modifiers may use one modifier flag.  E.g.,
    // on Ubuntu 10.10, Alt and Meta share the Mod1 in default settings.
    // And also Super and Hyper share the Mod4. In such cases, we need to
    // decide which modifier flag means one of DOM modifiers.

    // mod[0] is Modifier introduced by Mod1.
    Modifier mod[5];
    int32_t foundLevel[5];
    for (uint32_t i = 0; i < ArrayLength(mod); i++) {
        mod[i] = NOT_MODIFIER;
        foundLevel[i] = INT32_MAX;
    }
    const uint32_t map_size = 8 * xmodmap->max_keypermod;
    for (uint32_t i = 0; i < map_size; i++) {
        KeyCode keycode = xmodmap->modifiermap[i];
        PR_LOG(gKeymapWrapperLog, PR_LOG_ALWAYS,
            ("KeymapWrapper(%p): InitBySystemSettings, "
             "  i=%d, keycode=0x%08X",
             this, i, keycode));
        if (!keycode || keycode < min_keycode || keycode > max_keycode) {
            continue;
        }

        ModifierKey* modifierKey = GetModifierKey(keycode);
        if (!modifierKey) {
            modifierKey = mModifierKeys.AppendElement(ModifierKey(keycode));
        }

        const KeySym* syms =
            xkeymap + (keycode - min_keycode) * keysyms_per_keycode;
        const uint32_t bit = i / xmodmap->max_keypermod;
        modifierKey->mMask |= 1 << bit;

        // We need to know the meaning of Mod1, Mod2, Mod3, Mod4 and Mod5.
        // Let's skip if current map is for others.
        if (bit < 3) {
            continue;
        }

        const int32_t modIndex = bit - 3;
        for (int32_t j = 0; j < keysyms_per_keycode; j++) {
            Modifier modifier = GetModifierForGDKKeyval(syms[j]);
            PR_LOG(gKeymapWrapperLog, PR_LOG_ALWAYS,
                ("KeymapWrapper(%p): InitBySystemSettings, "
                 "    Mod%d, j=%d, syms[j]=%s(0x%X), modifier=%s",
                 this, modIndex + 1, j, gdk_keyval_name(syms[j]), syms[j],
                 GetModifierName(modifier)));

            switch (modifier) {
                case NOT_MODIFIER:
                    // Don't overwrite the stored information with
                    // NOT_MODIFIER.
                    break;
                case CAPS_LOCK:
                case SHIFT:
//.........这里部分代码省略.........

PetscErrorCode FiberField_UnpackFromRecvbufs( FiberField f )
{
  int i;
  int e;
  int b;
  int lv; // local vert index
  int le; // local edge index
  int len; // length of recvbuf
  int total_recv_verts;
  int total_recv_edges;
  Array *recvbufs = f->recvbufs;
  Vertex v_local;
  Edge e_local;
  VertexEdgeMPI *buf;
  FiberType *ftype = ArrayGetData( f->fibertypesDB );
  PetscErrorCode ierr;

  PetscFunctionBegin;
 
  // sum up total number of verts and edges received
  total_recv_verts = 0;
  total_recv_edges = 0;

  for (b = 0; b < NUMNEI; b++) {
    len = ArrayLength( recvbufs[b] );
    buf = ArrayGetData( recvbufs[b] );
    for (i = 0; i < len; i++) {
      if ( ftype[ buf[i].type ].isEdge ) {
        total_recv_edges++;
      } else {
        total_recv_verts++;
      }
    }
  }

  ierr = PetscInfo1(0, "total_recv_verts = %d\n", total_recv_verts  ); CHKERRQ(ierr);
  ierr = PetscInfo1(0, "total_recv_edges = %d\n", total_recv_edges  ); CHKERRQ(ierr);

  // set local vert/edge array length to sum of total received
  ierr = ArraySetSize( f->verts, total_recv_verts); CHKERRQ(ierr);
  ierr = ArraySetSize( f->edges, total_recv_edges); CHKERRQ(ierr);
  v_local = ArrayGetData( f->verts );
  e_local = ArrayGetData( f->edges );

  // copy from bufs to local vert list
  // for each buf
  //   for each elem in buf
  //     if edge
  //       e_local = buf
  //     else
  //       v_local = buf
  lv = 0;
  le = 0;
  for (b = 0; b < NUMNEI; b++) {
    len = ArrayLength( recvbufs[b] );
    buf = ArrayGetData( recvbufs[b] );
    for (i = 0; i < len; i++) {
      if ( ftype[ buf[i].type ].isEdge ) {
        e_local[le].eID    = buf[i].xID;
        e_local[le].type   = buf[i].type;
        e_local[le].l0     = buf[i].X.x;
        e_local[le].vID[0] = buf[i].yIDs[0];
        e_local[le].vID[1] = buf[i].yIDs[1];
        le++;
      } else {
        v_local[lv].vID = buf[i].xID;
        v_local[lv].type= buf[i].type;
        v_local[lv].X   = buf[i].X;
        v_local[lv].V   = buf[i].V;
        for (e = 0; e < MAXEDGES; e++) {
          v_local[lv].eID[e] = buf[i].yIDs[e];
        }
        lv++;
      } // if vertex or edge
    } // for i in recvbuf
  } // for b in NUMNEI

  PetscFunctionReturn(0);
}

nsSVGElement::StringAttributesInfo
SVGMPathElement::GetStringInfo()
{
  return StringAttributesInfo(mStringAttributes, sStringInfo,
                              ArrayLength(sStringInfo));
}

bool
PluginHangUIParent::Init(const nsString& aPluginName)
{
  if (mHangUIProcessHandle) {
    return false;
  }

  nsresult rv;
  rv = mMiniShm.Init(this, ::IsDebuggerPresent() ? INFINITE : mIPCTimeoutMs);
  NS_ENSURE_SUCCESS(rv, false);
  nsCOMPtr<nsIProperties>
    directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID));
  if (!directoryService) {
    return false;
  }
  nsCOMPtr<nsIFile> greDir;
  rv = directoryService->Get(NS_GRE_DIR,
                             NS_GET_IID(nsIFile),
                             getter_AddRefs(greDir));
  if (NS_FAILED(rv)) {
    return false;
  }
  nsAutoString path;
  greDir->GetPath(path);

  FilePath exePath(path.get());
  exePath = exePath.AppendASCII(MOZ_HANGUI_PROCESS_NAME);
  CommandLine commandLine(exePath.value());

  nsXPIDLString localizedStr;
  const PRUnichar* formatParams[] = { aPluginName.get() };
  rv = nsContentUtils::FormatLocalizedString(nsContentUtils::eDOM_PROPERTIES,
                                             "PluginHangUIMessage",
                                             formatParams,
                                             localizedStr);
  if (NS_FAILED(rv)) {
    return false;
  }
  commandLine.AppendLooseValue(localizedStr.get());

  const char* keys[] = { "PluginHangUITitle",
                         "PluginHangUIWaitButton",
                         "PluginHangUIStopButton",
                         "DontAskAgain" };
  for (unsigned int i = 0; i < ArrayLength(keys); ++i) {
    rv = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
                                            keys[i],
                                            localizedStr);
    if (NS_FAILED(rv)) {
      return false;
    }
    commandLine.AppendLooseValue(localizedStr.get());
  }

  rv = GetHangUIOwnerWindowHandle(mMainWindowHandle);
  if (NS_FAILED(rv)) {
    return false;
  }
  nsAutoString hwndStr;
  hwndStr.AppendPrintf("%p", mMainWindowHandle);
  commandLine.AppendLooseValue(hwndStr.get());

  ScopedHandle procHandle(::OpenProcess(SYNCHRONIZE,
                                        TRUE,
                                        GetCurrentProcessId()));
  if (!procHandle.IsValid()) {
    return false;
  }
  nsAutoString procHandleStr;
  procHandleStr.AppendPrintf("%p", procHandle.Get());
  commandLine.AppendLooseValue(procHandleStr.get());

  // On Win7+, pass the application user model to the child, so it can
  // register with it. This insures windows created by the Hang UI
  // properly group with the parent app on the Win7 taskbar.
  nsCOMPtr<nsIWinTaskbar> taskbarInfo = do_GetService(NS_TASKBAR_CONTRACTID);
  if (taskbarInfo) {
    bool isSupported = false;
    taskbarInfo->GetAvailable(&isSupported);
    nsAutoString appId;
    if (isSupported && NS_SUCCEEDED(taskbarInfo->GetDefaultGroupId(appId))) {
      commandLine.AppendLooseValue(appId.get());
    } else {
      commandLine.AppendLooseValue(L"-");
    }
  } else {
    commandLine.AppendLooseValue(L"-");
  }

  nsAutoString ipcTimeoutStr;
  ipcTimeoutStr.AppendInt(mIPCTimeoutMs);
  commandLine.AppendLooseValue(ipcTimeoutStr.get());

  std::wstring ipcCookie;
  rv = mMiniShm.GetCookie(ipcCookie);
  if (NS_FAILED(rv)) {
    return false;
  }
  commandLine.AppendLooseValue(ipcCookie);

//.........这里部分代码省略.........

bool
WebGLContext::InitWebGL2()
{
    MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");

    // check OpenGL features
    if (!gl->IsSupported(gl::GLFeature::occlusion_query) &&
        !gl->IsSupported(gl::GLFeature::occlusion_query_boolean))
    {
        // On desktop, we fake occlusion_query_boolean with occlusion_query if
        // necessary. (See WebGL2ContextQueries.cpp)
        GenerateWarning("WebGL 2 unavailable. Requires occlusion queries.");
        return false;
    }

    std::vector<gl::GLFeature> missingList;

    for (size_t i = 0; i < ArrayLength(kRequiredFeatures); i++) {
        if (!gl->IsSupported(kRequiredFeatures[i]))
            missingList.push_back(kRequiredFeatures[i]);
    }

#ifdef XP_MACOSX
    // On OSX, GL core profile is used. This requires texture swizzle
    // support to emulate legacy texture formats: ALPHA, LUMINANCE,
    // and LUMINANCE_ALPHA.
    if (!gl->IsSupported(gl::GLFeature::texture_swizzle))
        missingList.push_back(gl::GLFeature::texture_swizzle);
#endif

    if (missingList.size()) {
        nsAutoCString exts;
        for (auto itr = missingList.begin(); itr != missingList.end(); ++itr) {
            exts.AppendLiteral("\n  ");
            exts.Append(gl::GLContext::GetFeatureName(*itr));
        }
        GenerateWarning("WebGL 2 unavailable. The following required features are"
                        " unavailible: %s", exts.BeginReading());
        return false;
    }

    // ok WebGL 2 is compatible, we can enable natively supported extensions.
    for (size_t i = 0; i < ArrayLength(kNativelySupportedExtensions); i++) {
        EnableExtension(kNativelySupportedExtensions[i]);

        MOZ_ASSERT(IsExtensionEnabled(kNativelySupportedExtensions[i]));
    }

    // we initialise WebGL 2 related stuff.
    gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
                     &mGLMaxTransformFeedbackSeparateAttribs);
    gl->GetUIntegerv(LOCAL_GL_MAX_UNIFORM_BUFFER_BINDINGS,
                     &mGLMaxUniformBufferBindings);

    mBoundTransformFeedbackBuffers.SetLength(mGLMaxTransformFeedbackSeparateAttribs);
    mBoundUniformBuffers.SetLength(mGLMaxUniformBufferBindings);

    mDefaultTransformFeedback = new WebGLTransformFeedback(this, 0);
    mBoundTransformFeedback = mDefaultTransformFeedback;

    mBypassShaderValidation = true;

    return true;
}

nsSVGElement::NumberAttributesInfo
SVGFEDisplacementMapElement::GetNumberInfo()
{
  return NumberAttributesInfo(mNumberAttributes, sNumberInfo,
                              ArrayLength(sNumberInfo));
}

nsSVGElement::StringAttributesInfo
SVGFEDisplacementMapElement::GetStringInfo()
{
  return StringAttributesInfo(mStringAttributes, sStringInfo,
                              ArrayLength(sStringInfo));
}

nsSVGElement::IntegerPairAttributesInfo
SVGFEConvolveMatrixElement::GetIntegerPairInfo()
{
  return IntegerPairAttributesInfo(mIntegerPairAttributes, sIntegerPairInfo,
                                   ArrayLength(sIntegerPairInfo));
}

nsSVGElement::BooleanAttributesInfo
SVGFEConvolveMatrixElement::GetBooleanInfo()
{
  return BooleanAttributesInfo(mBooleanAttributes, sBooleanInfo,
                               ArrayLength(sBooleanInfo));
}

////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
// When a peer has accepted a GT2Connection the UDP layer needs to let 
// higher level app or message handler know that it accepted the request to
// to message a peer.
void gsUdpConnectedRoutingCB(GT2Connection theConnection, GT2Result theResult, GT2Byte *theMessage,
							 int theMessageLen)
{
	GSUdpEngineObject *aUdp = gsUdpEngineGetEngine();
	int aIndex, len;
	GSUdpErrorCode aCode;
	char anAddr[GS_IP_ADDR_AND_PORT];

	switch(theResult)
	{
		case GT2NegotiationError:
			aCode = GS_UDP_REMOTE_ERROR;
			break;
		case GT2Rejected:
			aCode = GS_UDP_REJECTED;
			break;
		case GT2TimedOut:
			aCode = GS_UDP_TIMED_OUT;
			break;
		case GT2Success:
			aCode = GS_UDP_NO_ERROR;
			break;
		default: 
			aCode = GS_UDP_UNKNOWN_ERROR;
			break;
	}
	if (theResult == GT2Rejected)
	{
		int aRemotePeerIdx;
		GSUdpRemotePeer aRemotePeer;
		aRemotePeer.mAddr = gt2GetRemoteIP(theConnection);
		aRemotePeer.mPort = gt2GetRemotePort(theConnection);
		aRemotePeerIdx = ArraySearch(aUdp->mRemotePeers, &aRemotePeer, gsUdpRemotePeerCompare, 0, 0);
		if (aRemotePeerIdx != NOT_FOUND)
		{
			gsDebugFormat(GSIDebugCat_Common, GSIDebugType_Network, GSIDebugLevel_Comment, 
				"[Udp Engine] Connect rejected by %s\n", gt2AddressToString(gt2GetRemoteIP(theConnection), 
				gt2GetRemotePort(theConnection), anAddr));

			ArrayDeleteAt(aUdp->mRemotePeers, aRemotePeerIdx);
		}
	}

	len = ArrayLength(aUdp->mMsgHandlers);
	for (aIndex = 0; aIndex < len; aIndex++)
	{
		int aRemotePeerIdx;
		GSUdpRemotePeer aRemotePeer;
		GSUdpMsgHandler *aTempHandler = (GSUdpMsgHandler *)ArrayNth(aUdp->mMsgHandlers, aIndex);
		
		aRemotePeer.mAddr = gt2GetRemoteIP(theConnection);
		aRemotePeer.mPort = gt2GetRemotePort(theConnection);
		aRemotePeerIdx = ArraySearch(aTempHandler->mPendingConnections, &aRemotePeer, gsUdpRemotePeerCompare, 0, 0);
		if (aRemotePeerIdx != NOT_FOUND)
		{
			if (aTempHandler->mConnected)
			{	
				gsDebugFormat(GSIDebugCat_Common, GSIDebugType_Network, GSIDebugLevel_Comment, 
					"[Udp Engine] Passing connect result to message handler\n");
				aTempHandler->mConnected(gt2GetRemoteIP(theConnection), gt2GetRemotePort(theConnection), 
					aCode, theResult == GT2Rejected ? gsi_true : gsi_false, aTempHandler->mUserData);				
			}
			ArrayDeleteAt(aTempHandler->mPendingConnections, aRemotePeerIdx);
			return;
		}
	}
	
	if (aUdp->mAppPendingConnections > 0)
	{
		if (aUdp->mAppConnected)
		{
			gsDebugFormat(GSIDebugCat_Common, GSIDebugType_Network, GSIDebugLevel_Comment, 
				"[Udp Engine] Passing connect result to app\n");
			aUdp->mAppConnected(gt2GetRemoteIP(theConnection),gt2GetRemotePort(theConnection), 
				aCode, theResult == GT2Rejected ? gsi_true : gsi_false, aUdp->mAppUserData);
		}
		aUdp->mAppPendingConnections--;
	}
	GSI_UNUSED(theMessage);
	GSI_UNUSED(theMessageLen);
	GSI_UNUSED(anAddr);
}

////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
// UDP Layer must be initialized
// theIp and thePort cannot be 0 (Zero)
// Starts a request to open a communication channel with another peer based on 
// IP and port.  
GSUdpErrorCode gsUdpEngineStartTalkingToPeer(unsigned int theIp, unsigned short thePort,
									  char theInitMsg[GS_UDP_MSG_HEADER_LEN], int timeOut)
{
	char anAddr[GS_IP_ADDR_AND_PORT];
	GSUdpRemotePeer aRemotePeer;	
	GSUdpMsgHandler aHandler;
	GSUdpEngineObject *aUdp = gsUdpEngineGetEngine();
	GT2ConnectionCallbacks aCallbacks;
	int index;
	GS_ASSERT(aUdp->mInitialized);
	GS_ASSERT(theIp);
	GS_ASSERT(thePort);

	if (!aUdp->mInitialized)
	{
		gsDebugFormat(GSIDebugCat_Common, GSIDebugType_Network, GSIDebugLevel_Debug,
			"[Udp Engine] Engine not initialized\n");
		return GS_UDP_NETWORK_ERROR;
	}
	
	if (theIp == 0 || thePort == 0)
	{
		gsDebugFormat(GSIDebugCat_Common, GSIDebugType_Network, GSIDebugLevel_Debug,
			"[Udp Engine] Invalid parameter(s), check ip, port");
		return GS_UDP_PARAMETER_ERROR;
	}
	
	aRemotePeer.mAddr = theIp;  // In Network Byte Order for GT2
	aRemotePeer.mPort = thePort;  // In Host Byte Order for GT2

	index = ArraySearch(aUdp->mRemotePeers, &aRemotePeer, gsUdpRemotePeerCompare, 0, 0);
	if (index != NOT_FOUND)
	{
		GSUdpRemotePeer *aPeerFound = (GSUdpRemotePeer *)ArrayNth(aUdp->mRemotePeers, index);
		GT2ConnectionState aState = gt2GetConnectionState(aPeerFound->mConnection);
		if (aState == GT2Connected)
		{
			gsDebugFormat(GSIDebugCat_Common, GSIDebugType_Network, GSIDebugLevel_Debug,
				"[Udp Engine] Engine is already talking to remote address\n");
			return GS_UDP_ADDRESS_ALREADY_IN_USE;
		}
		else if (aState == GT2Connecting)
		{
			memcpy(aHandler.mInitialMsg, theInitMsg, GS_UDP_MSG_HEADER_LEN);
			
			index = ArraySearch(aUdp->mMsgHandlers, &aHandler, gsUdpMsgHandlerCompare, 0, 0);
			if (index != NOT_FOUND)
			{
				GSUdpMsgHandler *aHandlerFound = (GSUdpMsgHandler *)ArrayNth(aUdp->mMsgHandlers, index);
				ArrayAppend(aHandlerFound->mPendingConnections, aPeerFound);
			}
		}
	}	
	else
	{
		gt2AddressToString(theIp, thePort, anAddr);
		aCallbacks.closed = gsUdpClosedRoutingCB;
		aCallbacks.connected = gsUdpConnectedRoutingCB;
		aCallbacks.ping = gsUdpPingRoutingCB;
		aCallbacks.received = gsUdpReceivedRoutingCB;

		// start the connect without blocking since we want the engine to be as asynchronous as possible
		gt2Connect(aUdp->mSocket, &aRemotePeer.mConnection, anAddr, (unsigned char *)theInitMsg, GS_UDP_MSG_HEADER_LEN, timeOut, &aCallbacks, GT2False);

		ArrayAppend(aUdp->mRemotePeers, &aRemotePeer);
		
		memcpy(aHandler.mInitialMsg, theInitMsg, GS_UDP_MSG_HEADER_LEN);
		
		index = ArraySearch(aUdp->mMsgHandlers, &aHandler, gsUdpMsgHandlerCompare, 0, 0);
		if (index != NOT_FOUND)
		{
			GSUdpRemotePeer *aRemotePeerPtr = (GSUdpRemotePeer *)ArrayNth(aUdp->mRemotePeers, ArrayLength(aUdp->mRemotePeers) - 1);
			GSUdpMsgHandler *aHandlerFound = (GSUdpMsgHandler *)ArrayNth(aUdp->mMsgHandlers, index);
			ArrayAppend(aHandlerFound->mPendingConnections, &aRemotePeerPtr);
		}
		else
		{
			aUdp->mAppPendingConnections++;
		}
	}
	return GS_UDP_NO_ERROR;
}

//.........这里部分代码省略.........
  } else {
    // The buffer's not big enough, so allocate a new one
    createdBuffer = true;
  }
  NS_ASSERTION(!(aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE) ||
               destBufferRect == neededRegion.GetBounds(),
               "If we're resampling, we need to validate the entire buffer");

  if (!createdBuffer && !mHasBuffer) {
    return result;
  }

  if (createdBuffer) {
    if (mHasBuffer &&
        (mode != Layer::SURFACE_COMPONENT_ALPHA || mHasBufferOnWhite)) {
      mTextureInfo.mDeprecatedTextureHostFlags = TEXTURE_HOST_COPY_PREVIOUS;
    }

    mHasBuffer = true;
    if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
      mHasBufferOnWhite = true;
    }
    mBufferRect = destBufferRect;
    mBufferRotation = nsIntPoint(0,0);
    NotifyBufferCreated(contentType, bufferFlags);
  }

  NS_ASSERTION(canHaveRotation || mBufferRotation == nsIntPoint(0,0),
               "Rotation disabled, but we have nonzero rotation?");

  nsIntRegion invalidate;
  invalidate.Sub(aLayer->GetValidRegion(), destBufferRect);
  result.mRegionToInvalidate.Or(result.mRegionToInvalidate, invalidate);

  // BeginUpdate is allowed to modify the given region,
  // if it wants more to be repainted than we request.
  if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
    nsIntRegion drawRegionCopy = result.mRegionToDraw;
    nsRefPtr<gfxASurface> onBlack = GetUpdateSurface(BUFFER_BLACK, drawRegionCopy);
    nsRefPtr<gfxASurface> onWhite = GetUpdateSurface(BUFFER_WHITE, result.mRegionToDraw);
    if (onBlack && onWhite) {
      NS_ASSERTION(result.mRegionToDraw == drawRegionCopy,
                   "BeginUpdate should always modify the draw region in the same way!");
      FillSurface(onBlack, result.mRegionToDraw, nsIntPoint(drawBounds.x, drawBounds.y), gfxRGBA(0.0, 0.0, 0.0, 1.0));
      FillSurface(onWhite, result.mRegionToDraw, nsIntPoint(drawBounds.x, drawBounds.y), gfxRGBA(1.0, 1.0, 1.0, 1.0));
      if (RefPtr<DrawTarget> onBlackDT = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(onBlack, onBlack->GetSize())) {
        RefPtr<DrawTarget> onWhiteDT = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(onWhite, onWhite->GetSize());
        RefPtr<DrawTarget> dt = Factory::CreateDualDrawTarget(onBlackDT, onWhiteDT);
        result.mContext = new gfxContext(dt);
      } else {
        gfxASurface* surfaces[2] = { onBlack.get(), onWhite.get() };
        nsRefPtr<gfxTeeSurface> surf = new gfxTeeSurface(surfaces, ArrayLength(surfaces));

        // XXX If the device offset is set on the individual surfaces instead of on
        // the tee surface, we render in the wrong place. Why?
        gfxPoint deviceOffset = onBlack->GetDeviceOffset();
        onBlack->SetDeviceOffset(gfxPoint(0, 0));
        onWhite->SetDeviceOffset(gfxPoint(0, 0));
        surf->SetDeviceOffset(deviceOffset);

        // Using this surface as a source will likely go horribly wrong, since
        // only the onBlack surface will really be used, so alpha information will
        // be incorrect.
        surf->SetAllowUseAsSource(false);
        result.mContext = new gfxContext(surf);
      }
    } else {
      result.mContext = nullptr;
    }
  } else {
    nsRefPtr<gfxASurface> surf = GetUpdateSurface(BUFFER_BLACK, result.mRegionToDraw);
    if (RefPtr<DrawTarget> dt = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(surf, surf->GetSize())) {
      result.mContext = new gfxContext(dt);
    } else {
      result.mContext = new gfxContext(surf);
    }
  }
  if (!result.mContext) {
    NS_WARNING("unable to get context for update");
    return result;
  }
  result.mContext->Translate(-gfxPoint(drawBounds.x, drawBounds.y));

  // If we do partial updates, we have to clip drawing to the regionToDraw.
  // If we don't clip, background images will be fillrect'd to the region correctly,
  // while text or lines will paint outside of the regionToDraw. This becomes apparent
  // with concave regions. Right now the scrollbars invalidate a narrow strip of the bar
  // although they never cover it. This leads to two draw rects, the narow strip and the actually
  // newly exposed area. It would be wise to fix this glitch in any way to have simpler
  // clip and draw regions.
  gfxUtils::ClipToRegion(result.mContext, result.mRegionToDraw);

  if (mContentType == gfxASurface::CONTENT_COLOR_ALPHA) {
    result.mContext->SetOperator(gfxContext::OPERATOR_CLEAR);
    result.mContext->Paint();
    result.mContext->SetOperator(gfxContext::OPERATOR_OVER);
  }

  return result;
}

void
TextTrackManager::PerformTrackSelection(TextTrackKind aTextTrackKind)
{
  TextTrackKind ttKinds[] = { aTextTrackKind };
  PerformTrackSelection(ttKinds, ArrayLength(ttKinds));
}

/* static */ guint
KeymapWrapper::GuessGDKKeyval(uint32_t aDOMKeyCode)
{
    // First, try to handle alphanumeric input, not listed in nsKeycodes:
    // most likely, more letters will be getting typed in than things in
    // the key list, so we will look through these first.

    if (aDOMKeyCode >= NS_VK_A && aDOMKeyCode <= NS_VK_Z) {
        // gdk and DOM both use the ASCII codes for these keys.
        return aDOMKeyCode;
    }

    // numbers
    if (aDOMKeyCode >= NS_VK_0 && aDOMKeyCode <= NS_VK_9) {
        // gdk and DOM both use the ASCII codes for these keys.
        return aDOMKeyCode - NS_VK_0 + GDK_0;
    }

    switch (aDOMKeyCode) {
        // keys in numpad
        case NS_VK_MULTIPLY:  return GDK_KP_Multiply;
        case NS_VK_ADD:       return GDK_KP_Add;
        case NS_VK_SEPARATOR: return GDK_KP_Separator;
        case NS_VK_SUBTRACT:  return GDK_KP_Subtract;
        case NS_VK_DECIMAL:   return GDK_KP_Decimal;
        case NS_VK_DIVIDE:    return GDK_KP_Divide;
        case NS_VK_NUMPAD0:   return GDK_KP_0;
        case NS_VK_NUMPAD1:   return GDK_KP_1;
        case NS_VK_NUMPAD2:   return GDK_KP_2;
        case NS_VK_NUMPAD3:   return GDK_KP_3;
        case NS_VK_NUMPAD4:   return GDK_KP_4;
        case NS_VK_NUMPAD5:   return GDK_KP_5;
        case NS_VK_NUMPAD6:   return GDK_KP_6;
        case NS_VK_NUMPAD7:   return GDK_KP_7;
        case NS_VK_NUMPAD8:   return GDK_KP_8;
        case NS_VK_NUMPAD9:   return GDK_KP_9;
        // other prinable keys
        case NS_VK_SPACE:               return GDK_space;
        case NS_VK_COLON:               return GDK_colon;
        case NS_VK_SEMICOLON:           return GDK_semicolon;
        case NS_VK_LESS_THAN:           return GDK_less;
        case NS_VK_EQUALS:              return GDK_equal;
        case NS_VK_GREATER_THAN:        return GDK_greater;
        case NS_VK_QUESTION_MARK:       return GDK_question;
        case NS_VK_AT:                  return GDK_at;
        case NS_VK_CIRCUMFLEX:          return GDK_asciicircum;
        case NS_VK_EXCLAMATION:         return GDK_exclam;
        case NS_VK_DOUBLE_QUOTE:        return GDK_quotedbl;
        case NS_VK_HASH:                return GDK_numbersign;
        case NS_VK_DOLLAR:              return GDK_dollar;
        case NS_VK_PERCENT:             return GDK_percent;
        case NS_VK_AMPERSAND:           return GDK_ampersand;
        case NS_VK_UNDERSCORE:          return GDK_underscore;
        case NS_VK_OPEN_PAREN:          return GDK_parenleft;
        case NS_VK_CLOSE_PAREN:         return GDK_parenright;
        case NS_VK_ASTERISK:            return GDK_asterisk;
        case NS_VK_PLUS:                return GDK_plus;
        case NS_VK_PIPE:                return GDK_bar;
        case NS_VK_HYPHEN_MINUS:        return GDK_minus;
        case NS_VK_OPEN_CURLY_BRACKET:  return GDK_braceleft;
        case NS_VK_CLOSE_CURLY_BRACKET: return GDK_braceright;
        case NS_VK_TILDE:               return GDK_asciitilde;
        case NS_VK_COMMA:               return GDK_comma;
        case NS_VK_PERIOD:              return GDK_period;
        case NS_VK_SLASH:               return GDK_slash;
        case NS_VK_BACK_QUOTE:          return GDK_grave;
        case NS_VK_OPEN_BRACKET:        return GDK_bracketleft;
        case NS_VK_BACK_SLASH:          return GDK_backslash;
        case NS_VK_CLOSE_BRACKET:       return GDK_bracketright;
        case NS_VK_QUOTE:               return GDK_apostrophe;
    }

    // misc other things
    for (uint32_t i = 0; i < ArrayLength(kKeyPairs); ++i) {
        if (kKeyPairs[i].DOMKeyCode == aDOMKeyCode) {
            return kKeyPairs[i].GDKKeyval;
        }
    }

    return 0;
}

nsSVGElement::AngleAttributesInfo
SVGMarkerElement::GetAngleInfo()
{
  return AngleAttributesInfo(mAngleAttributes, sAngleInfo,
                             ArrayLength(sAngleInfo));
}

nsSVGElement::EnumAttributesInfo
SVGFEConvolveMatrixElement::GetEnumInfo()
{
  return EnumAttributesInfo(mEnumAttributes, sEnumInfo,
                            ArrayLength(sEnumInfo));
}

nsSVGElement::EnumAttributesInfo
SVGMarkerElement::GetEnumInfo()
{
  return EnumAttributesInfo(mEnumAttributes, sEnumInfo,
                            ArrayLength(sEnumInfo));
}

nsSVGElement::StringAttributesInfo
SVGFEConvolveMatrixElement::GetStringInfo()
{
  return StringAttributesInfo(mStringAttributes, sStringInfo,
                              ArrayLength(sStringInfo));
}

nsSVGElement::EnumAttributesInfo
SVGFEDisplacementMapElement::GetEnumInfo()
{
  return EnumAttributesInfo(mEnumAttributes, sEnumInfo,
                            ArrayLength(sEnumInfo));
}

nsSVGElement::NumberListAttributesInfo
SVGFEConvolveMatrixElement::GetNumberListInfo()
{
  return NumberListAttributesInfo(mNumberListAttributes, sNumberListInfo,
                                  ArrayLength(sNumberListInfo));
}