C++ NotNull::GetProgressTracker方法代码示例

void
VectorImage::CreateSurfaceAndShow(const SVGDrawingParameters& aParams, BackendType aBackend)
{
  mSVGDocumentWrapper->UpdateViewportBounds(aParams.viewportSize);
  mSVGDocumentWrapper->FlushImageTransformInvalidation();

  RefPtr<gfxDrawingCallback> cb =
    new SVGDrawingCallback(mSVGDocumentWrapper,
                           aParams.viewportSize,
                           aParams.size,
                           aParams.flags);

  RefPtr<gfxDrawable> svgDrawable =
    new gfxCallbackDrawable(cb, aParams.size);

  bool bypassCache = bool(aParams.flags & FLAG_BYPASS_SURFACE_CACHE) ||
                     // Refuse to cache animated images:
                     // XXX(seth): We may remove this restriction in bug 922893.
                     mHaveAnimations ||
                     // The image is too big to fit in the cache:
                     !SurfaceCache::CanHold(aParams.size);
  if (bypassCache) {
    return Show(svgDrawable, aParams);
  }

  // We're about to rerasterize, which may mean that some of the previous
  // surfaces we've rasterized aren't useful anymore. We can allow them to
  // expire from the cache by unlocking them here, and then sending out an
  // invalidation. If this image is locked, any surfaces that are still useful
  // will become locked again when Draw touches them, and the remainder will
  // eventually expire.
  SurfaceCache::UnlockEntries(ImageKey(this));

  // Try to create an imgFrame, initializing the surface it contains by drawing
  // our gfxDrawable into it. (We use FILTER_NEAREST since we never scale here.)
  NotNull<RefPtr<imgFrame>> frame = WrapNotNull(new imgFrame);
  nsresult rv =
    frame->InitWithDrawable(svgDrawable, aParams.size,
                            SurfaceFormat::B8G8R8A8,
                            SamplingFilter::POINT, aParams.flags,
                            aBackend);

  // If we couldn't create the frame, it was probably because it would end
  // up way too big. Generally it also wouldn't fit in the cache, but the prefs
  // could be set such that the cache isn't the limiting factor.
  if (NS_FAILED(rv)) {
    return Show(svgDrawable, aParams);
  }

  // Take a strong reference to the frame's surface and make sure it hasn't
  // already been purged by the operating system.
  RefPtr<SourceSurface> surface = frame->GetSourceSurface();
  if (!surface) {
    return Show(svgDrawable, aParams);
  }

  // Attempt to cache the frame.
  SurfaceKey surfaceKey = VectorSurfaceKey(aParams.size, aParams.svgContext);
  NotNull<RefPtr<ISurfaceProvider>> provider =
    WrapNotNull(new SimpleSurfaceProvider(ImageKey(this), surfaceKey, frame));
  SurfaceCache::Insert(provider);

  // Draw.
  RefPtr<gfxDrawable> drawable =
    new gfxSurfaceDrawable(surface, aParams.size);
  Show(drawable, aParams);

  // Send out an invalidation so that surfaces that are still in use get
  // re-locked. See the discussion of the UnlockSurfaces call above.
  if (!(aParams.flags & FLAG_ASYNC_NOTIFY)) {
    mProgressTracker->SyncNotifyProgress(FLAG_FRAME_COMPLETE,
                                         GetMaxSizedIntRect());
  } else {
    NotNull<RefPtr<VectorImage>> image = WrapNotNull(this);
    NS_DispatchToMainThread(NS_NewRunnableFunction(
                              "ProgressTracker::SyncNotifyProgress",
                              [=]() -> void {
      RefPtr<ProgressTracker> tracker = image->GetProgressTracker();
      if (tracker) {
        tracker->SyncNotifyProgress(FLAG_FRAME_COMPLETE,
                                    GetMaxSizedIntRect());
      }
    }));
  }
}