Bug 564991. Part 37: Add test plugin API to make the plugin invalidate itself during each paint. r=josh

modules/plugin/test/testplugin/README

@@ -171,6 +171,10 @@ window.
 * getWidthAtLastPaint()
 Returns the window width that was current when the plugin last painted.
 
+* setInvalidateDuringPaint(value)
+When value is true, every time the plugin paints, it will invalidate
+itself *during the paint* using NPN_Invalidate.
+
 == Plugin geometry ==
 
 The test plugin supports the following scriptable methods:

modules/plugin/test/testplugin/nptest.cpp

@@ -142,6 +142,7 @@ static bool getLastMouseX(NPObject* npobj, const NPVariant* args, uint32_t argCo
 static bool getLastMouseY(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result);
 static bool getPaintCount(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result);
 static bool getWidthAtLastPaint(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result);
+static bool setInvalidateDuringPaint(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result);
 static bool getError(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result);
 static bool doInternalConsistencyCheck(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result);
 static bool setColor(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result);
@@ -192,6 +193,7 @@ static const NPUTF8* sPluginMethodIdentifierNames[] = {
   "getLastMouseY",
   "getPaintCount",
   "getWidthAtLastPaint",
+  "setInvalidateDuringPaint",
   "getError",
   "doInternalConsistencyCheck",
   "setColor",
@@ -243,6 +245,7 @@ static const ScriptableFunction sPluginMethodFunctions[] = {
   getLastMouseY,
   getPaintCount,
   getWidthAtLastPaint,
+  setInvalidateDuringPaint,
   getError,
   doInternalConsistencyCheck,
   setColor,
@@ -689,6 +692,7 @@ NPP_New(NPMIMEType pluginType, NPP instance, uint16_t mode, int16_t argc, char*
   instanceData->testrange = NULL;
   instanceData->hasWidget = false;
   instanceData->npnNewStream = false;
+  instanceData->invalidateDuringPaint = false;
   instanceData->writeCount = 0;
   instanceData->writeReadyCount = 0;
   memset(&instanceData->window, 0, sizeof(instanceData->window));
@@ -2127,6 +2131,22 @@ getWidthAtLastPaint(NPObject* npobj, const NPVariant* args, uint32_t argCount, N
   return true;
 }
 
+static bool
+setInvalidateDuringPaint(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result)
+{
+  if (argCount != 1)
+    return false;
+
+  if (!NPVARIANT_IS_BOOLEAN(args[0]))
+    return false;
+  bool doInvalidate = NPVARIANT_TO_BOOLEAN(args[0]);
+
+  NPP npp = static_cast<TestNPObject*>(npobj)->npp;
+  InstanceData* id = static_cast<InstanceData*>(npp->pdata);
+  id->invalidateDuringPaint = doInvalidate;
+  return true;
+}
+
 static bool
 getError(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result)
 {
@@ -2338,6 +2358,15 @@ void notifyDidPaint(InstanceData* instanceData)
 {
   ++instanceData->paintCount;
   instanceData->widthAtLastPaint = instanceData->window.width;
+
+  if (instanceData->invalidateDuringPaint) {
+    NPRect r;
+    r.left = 0;
+    r.top = 0;
+    r.right = instanceData->window.width;
+    r.bottom = instanceData->window.height;
+    NPN_InvalidateRect(instanceData->npp, &r);
+  }
 }
 
 static const NPClass kTestSharedNPClass = {

modules/plugin/test/testplugin/nptest.h

@@ -102,6 +102,7 @@ typedef struct InstanceData {
   uint32_t timerID[2];
   bool timerTestResult;
   bool asyncCallbackResult;
+  bool invalidateDuringPaint;
   int32_t winX;
   int32_t winY;
   int32_t lastMouseX;