image/SVGDocumentWrapper.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "SVGDocumentWrapper.h"
   7
   8 #include "mozilla/PresShell.h"
   9 #include "mozilla/SMILAnimationController.h"
  10 #include "mozilla/SVGObserverUtils.h"
  11 #include "mozilla/dom/Document.h"
  12 #include "mozilla/dom/DocumentTimeline.h"
  13 #include "mozilla/dom/Element.h"
  14 #include "mozilla/dom/ImageTracker.h"
  15 #include "mozilla/dom/SVGDocument.h"
  16 #include "mozilla/dom/SVGSVGElement.h"
  17 #include "nsICategoryManager.h"
  18 #include "nsIChannel.h"
  19 #include "nsIContentViewer.h"
  20 #include "nsIDocumentLoaderFactory.h"
  21 #include "nsIHttpChannel.h"
  22 #include "nsIObserverService.h"
  23 #include "nsIParser.h"
  24 #include "nsIRequest.h"
  25 #include "nsIStreamListener.h"
  26 #include "nsIXMLContentSink.h"
  27 #include "nsNetCID.h"
  28 #include "nsComponentManagerUtils.h"
  29 #include "nsServiceManagerUtils.h"
  30 #include "nsMimeTypes.h"
  31
  32 namespace mozilla {
  33
  34 using namespace dom;
  35 using namespace gfx;
  36
  37 namespace image {
  38
  39 NS_IMPL_ISUPPORTS(SVGDocumentWrapper, nsIStreamListener, nsIRequestObserver,
  40                   nsIObserver, nsISupportsWeakReference)
  41
  42 SVGDocumentWrapper::SVGDocumentWrapper()
  43     : mIgnoreInvalidation(false), mRegisteredForXPCOMShutdown(false) {}
  44
  45 SVGDocumentWrapper::~SVGDocumentWrapper() {
  46   DestroyViewer();
  47   if (mRegisteredForXPCOMShutdown) {
  48     UnregisterForXPCOMShutdown();
  49   }
  50 }
  51
  52 void SVGDocumentWrapper::DestroyViewer() {
  53   if (mViewer) {
  54     mViewer->GetDocument()->OnPageHide(false, nullptr);
  55     mViewer->Close(nullptr);
  56     mViewer->Destroy();
  57     mViewer = nullptr;
  58   }
  59 }
  60
  61 nsIFrame* SVGDocumentWrapper::GetRootLayoutFrame() {
  62   Element* rootElem = GetRootSVGElem();
  63   return rootElem ? rootElem->GetPrimaryFrame() : nullptr;
  64 }
  65
  66 void SVGDocumentWrapper::UpdateViewportBounds(const nsIntSize& aViewportSize) {
  67   MOZ_ASSERT(!mIgnoreInvalidation, "shouldn't be reentrant");
  68   mIgnoreInvalidation = true;
  69
  70   nsIntRect currentBounds;
  71   mViewer->GetBounds(currentBounds);
  72
  73   // If the bounds have changed, we need to do a layout flush.
  74   if (currentBounds.Size() != aViewportSize) {
  75     mViewer->SetBounds(IntRect(IntPoint(0, 0), aViewportSize));
  76     FlushLayout();
  77   }
  78
  79   mIgnoreInvalidation = false;
  80 }
  81
  82 void SVGDocumentWrapper::FlushImageTransformInvalidation() {
  83   MOZ_ASSERT(!mIgnoreInvalidation, "shouldn't be reentrant");
  84
  85   SVGSVGElement* svgElem = GetRootSVGElem();
  86   if (!svgElem) {
  87     return;
  88   }
  89
  90   mIgnoreInvalidation = true;
  91   svgElem->FlushImageTransformInvalidation();
  92   FlushLayout();
  93   mIgnoreInvalidation = false;
  94 }
  95
  96 bool SVGDocumentWrapper::IsAnimated() {
  97   // Can be called for animated images during shutdown, after we've
  98   // already Observe()'d XPCOM shutdown and cleared out our mViewer pointer.
  99   if (!mViewer) {
 100     return false;
 101   }
 102
 103   Document* doc = mViewer->GetDocument();
 104   if (!doc) {
 105     return false;
 106   }
 107   if (doc->Timeline()->HasAnimations()) {
 108     // CSS animations (technically HasAnimations() also checks for CSS
 109     // transitions and Web animations but since SVG-as-an-image doesn't run
 110     // script they will never run in the document that we wrap).
 111     return true;
 112   }
 113   if (doc->HasAnimationController() &&
 114       doc->GetAnimationController()->HasRegisteredAnimations()) {
 115     // SMIL animations
 116     return true;
 117   }
 118   return false;
 119 }
 120
 121 void SVGDocumentWrapper::StartAnimation() {
 122   // Can be called for animated images during shutdown, after we've
 123   // already Observe()'d XPCOM shutdown and cleared out our mViewer pointer.
 124   if (!mViewer) {
 125     return;
 126   }
 127
 128   Document* doc = mViewer->GetDocument();
 129   if (doc) {
 130     SMILAnimationController* controller = doc->GetAnimationController();
 131     if (controller) {
 132       controller->Resume(SMILTimeContainer::PAUSE_IMAGE);
 133     }
 134     doc->ImageTracker()->SetAnimatingState(true);
 135   }
 136 }
 137
 138 void SVGDocumentWrapper::StopAnimation() {
 139   // Can be called for animated images during shutdown, after we've
 140   // already Observe()'d XPCOM shutdown and cleared out our mViewer pointer.
 141   if (!mViewer) {
 142     return;
 143   }
 144
 145   Document* doc = mViewer->GetDocument();
 146   if (doc) {
 147     SMILAnimationController* controller = doc->GetAnimationController();
 148     if (controller) {
 149       controller->Pause(SMILTimeContainer::PAUSE_IMAGE);
 150     }
 151     doc->ImageTracker()->SetAnimatingState(false);
 152   }
 153 }
 154
 155 void SVGDocumentWrapper::ResetAnimation() {
 156   SVGSVGElement* svgElem = GetRootSVGElem();
 157   if (!svgElem) {
 158     return;
 159   }
 160
 161   svgElem->SetCurrentTime(0.0f);
 162 }
 163
 164 float SVGDocumentWrapper::GetCurrentTimeAsFloat() {
 165   SVGSVGElement* svgElem = GetRootSVGElem();
 166   return svgElem ? svgElem->GetCurrentTimeAsFloat() : 0.0f;
 167 }
 168
 169 void SVGDocumentWrapper::SetCurrentTime(float aTime) {
 170   SVGSVGElement* svgElem = GetRootSVGElem();
 171   if (svgElem && svgElem->GetCurrentTimeAsFloat() != aTime) {
 172     svgElem->SetCurrentTime(aTime);
 173   }
 174 }
 175
 176 void SVGDocumentWrapper::TickRefreshDriver() {
 177   if (RefPtr<PresShell> presShell = mViewer->GetPresShell()) {
 178     if (RefPtr<nsPresContext> presContext = presShell->GetPresContext()) {
 179       presContext->RefreshDriver()->DoTick();
 180     }
 181   }
 182 }
 183
 184 /** nsIStreamListener methods **/
 185
 186 NS_IMETHODIMP
 187 SVGDocumentWrapper::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* inStr,
 188                                     uint64_t sourceOffset, uint32_t count) {
 189   return mListener->OnDataAvailable(aRequest, inStr, sourceOffset, count);
 190 }
 191
 192 /** nsIRequestObserver methods **/
 193
 194 NS_IMETHODIMP
 195 SVGDocumentWrapper::OnStartRequest(nsIRequest* aRequest) {
 196   nsresult rv = SetupViewer(aRequest, getter_AddRefs(mViewer),
 197                             getter_AddRefs(mLoadGroup));
 198
 199   if (NS_SUCCEEDED(rv) && NS_SUCCEEDED(mListener->OnStartRequest(aRequest))) {
 200     mViewer->GetDocument()->SetIsBeingUsedAsImage();
 201     StopAnimation();  // otherwise animations start automatically in helper doc
 202
 203     rv = mViewer->Init(nullptr, nsIntRect(0, 0, 0, 0), nullptr);
 204     if (NS_SUCCEEDED(rv)) {
 205       rv = mViewer->Open(nullptr, nullptr);
 206     }
 207   }
 208   return rv;
 209 }
 210
 211 NS_IMETHODIMP
 212 SVGDocumentWrapper::OnStopRequest(nsIRequest* aRequest, nsresult status) {
 213   if (mListener) {
 214     mListener->OnStopRequest(aRequest, status);
 215     mListener = nullptr;
 216   }
 217
 218   return NS_OK;
 219 }
 220
 221 /** nsIObserver Methods **/
 222 NS_IMETHODIMP
 223 SVGDocumentWrapper::Observe(nsISupports* aSubject, const char* aTopic,
 224                             const char16_t* aData) {
 225   if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
 226     // Sever ties from rendering observers to helper-doc's root SVG node
 227     SVGSVGElement* svgElem = GetRootSVGElem();
 228     if (svgElem) {
 229       SVGObserverUtils::RemoveAllRenderingObservers(svgElem);
 230     }
 231
 232     // Clean up at XPCOM shutdown time.
 233     DestroyViewer();
 234     if (mListener) {
 235       mListener = nullptr;
 236     }
 237     if (mLoadGroup) {
 238       mLoadGroup = nullptr;
 239     }
 240
 241     // Turn off "registered" flag, or else we'll try to unregister when we die.
 242     // (No need for that now, and the try would fail anyway -- it's too late.)
 243     mRegisteredForXPCOMShutdown = false;
 244   } else {
 245     NS_ERROR("Unexpected observer topic.");
 246   }
 247   return NS_OK;
 248 }
 249
 250 /** Private helper methods **/
 251
 252 // This method is largely cribbed from
 253 // nsExternalResourceMap::PendingLoad::SetupViewer.
 254 nsresult SVGDocumentWrapper::SetupViewer(nsIRequest* aRequest,
 255                                          nsIContentViewer** aViewer,
 256                                          nsILoadGroup** aLoadGroup) {
 257   nsCOMPtr<nsIChannel> chan(do_QueryInterface(aRequest));
 258   NS_ENSURE_TRUE(chan, NS_ERROR_UNEXPECTED);
 259
 260   // Check for HTTP error page
 261   nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(aRequest));
 262   if (httpChannel) {
 263     bool requestSucceeded;
 264     if (NS_FAILED(httpChannel->GetRequestSucceeded(&requestSucceeded)) ||
 265         !requestSucceeded) {
 266       return NS_ERROR_FAILURE;
 267     }
 268   }
 269
 270   // Give this document its own loadgroup
 271   nsCOMPtr<nsILoadGroup> loadGroup;
 272   chan->GetLoadGroup(getter_AddRefs(loadGroup));
 273
 274   nsCOMPtr<nsILoadGroup> newLoadGroup =
 275       do_CreateInstance(NS_LOADGROUP_CONTRACTID);
 276   NS_ENSURE_TRUE(newLoadGroup, NS_ERROR_OUT_OF_MEMORY);
 277   newLoadGroup->SetLoadGroup(loadGroup);
 278
 279   nsCOMPtr<nsICategoryManager> catMan =
 280       do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
 281   NS_ENSURE_TRUE(catMan, NS_ERROR_NOT_AVAILABLE);
 282   nsCString contractId;
 283   nsresult rv = catMan->GetCategoryEntry("Gecko-Content-Viewers", IMAGE_SVG_XML,
 284                                          contractId);
 285   NS_ENSURE_SUCCESS(rv, rv);
 286   nsCOMPtr<nsIDocumentLoaderFactory> docLoaderFactory =
 287       do_GetService(contractId.get());
 288   NS_ENSURE_TRUE(docLoaderFactory, NS_ERROR_NOT_AVAILABLE);
 289
 290   nsCOMPtr<nsIContentViewer> viewer;
 291   nsCOMPtr<nsIStreamListener> listener;
 292   rv = docLoaderFactory->CreateInstance(
 293       "external-resource", chan, newLoadGroup, nsLiteralCString(IMAGE_SVG_XML),
 294       nullptr, nullptr, getter_AddRefs(listener), getter_AddRefs(viewer));
 295   NS_ENSURE_SUCCESS(rv, rv);
 296
 297   NS_ENSURE_TRUE(viewer, NS_ERROR_UNEXPECTED);
 298
 299   // Create a navigation time object and pass it to the SVG document through
 300   // the viewer.
 301   // The timeline(DocumentTimeline, used in CSS animation) of this SVG
 302   // document needs this navigation timing object for time computation, such
 303   // as to calculate current time stamp based on the start time of navigation
 304   // time object.
 305   //
 306   // For a root document, DocShell would do these sort of things
 307   // automatically. Since there is no DocShell for this wrapped SVG document,
 308   // we must set it up manually.
 309   RefPtr<nsDOMNavigationTiming> timing = new nsDOMNavigationTiming(nullptr);
 310   timing->NotifyNavigationStart(
 311       nsDOMNavigationTiming::DocShellState::eInactive);
 312   viewer->SetNavigationTiming(timing);
 313
 314   nsCOMPtr<nsIParser> parser = do_QueryInterface(listener);
 315   NS_ENSURE_TRUE(parser, NS_ERROR_UNEXPECTED);
 316
 317   // XML-only, because this is for SVG content
 318   nsCOMPtr<nsIContentSink> sink = parser->GetContentSink();
 319   NS_ENSURE_TRUE(sink, NS_ERROR_UNEXPECTED);
 320
 321   listener.swap(mListener);
 322   viewer.forget(aViewer);
 323   newLoadGroup.forget(aLoadGroup);
 324
 325   RegisterForXPCOMShutdown();
 326   return NS_OK;
 327 }
 328
 329 void SVGDocumentWrapper::RegisterForXPCOMShutdown() {
 330   MOZ_ASSERT(!mRegisteredForXPCOMShutdown, "re-registering for XPCOM shutdown");
 331   // Listen for xpcom-shutdown so that we can drop references to our
 332   // helper-document at that point. (Otherwise, we won't get cleaned up
 333   // until imgLoader::Shutdown, which can happen after the JAR service
 334   // and RDF service have been unregistered.)
 335   nsresult rv;
 336   nsCOMPtr<nsIObserverService> obsSvc = do_GetService(OBSERVER_SVC_CID, &rv);
 337   if (NS_FAILED(rv) || NS_FAILED(obsSvc->AddObserver(
 338                            this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true))) {
 339     NS_WARNING("Failed to register as observer of XPCOM shutdown");
 340   } else {
 341     mRegisteredForXPCOMShutdown = true;
 342   }
 343 }
 344
 345 void SVGDocumentWrapper::UnregisterForXPCOMShutdown() {
 346   MOZ_ASSERT(mRegisteredForXPCOMShutdown,
 347              "unregistering for XPCOM shutdown w/out being registered");
 348
 349   nsresult rv;
 350   nsCOMPtr<nsIObserverService> obsSvc = do_GetService(OBSERVER_SVC_CID, &rv);
 351   if (NS_FAILED(rv) ||
 352       NS_FAILED(obsSvc->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID))) {
 353     NS_WARNING("Failed to unregister as observer of XPCOM shutdown");
 354   } else {
 355     mRegisteredForXPCOMShutdown = false;
 356   }
 357 }
 358
 359 void SVGDocumentWrapper::FlushLayout() {
 360   if (SVGDocument* doc = GetDocument()) {
 361     doc->FlushPendingNotifications(FlushType::Layout);
 362   }
 363 }
 364
 365 SVGDocument* SVGDocumentWrapper::GetDocument() {
 366   if (!mViewer) {
 367     return nullptr;
 368   }
 369   Document* doc = mViewer->GetDocument();
 370   if (!doc) {
 371     return nullptr;
 372   }
 373   return doc->AsSVGDocument();
 374 }
 375
 376 SVGSVGElement* SVGDocumentWrapper::GetRootSVGElem() {
 377   if (!mViewer) {
 378     return nullptr;  // Can happen during destruction
 379   }
 380
 381   Document* doc = mViewer->GetDocument();
 382   if (!doc) {
 383     return nullptr;  // Can happen during destruction
 384   }
 385
 386   Element* rootElem = mViewer->GetDocument()->GetRootElement();
 387   if (!rootElem || !rootElem->IsSVGElement(nsGkAtoms::svg)) {
 388     return nullptr;
 389   }
 390
 391   return static_cast<SVGSVGElement*>(rootElem);
 392 }
 393
 394 }  // namespace image
 395 }  // namespace mozilla