dom/canvas/nsICanvasRenderingContextInternal.cpp

   1 /* -*- Mode: C++; tab-width: 40; 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 "nsICanvasRenderingContextInternal.h"
   7
   8 #include "mozilla/dom/Document.h"
   9 #include "mozilla/PresShell.h"
  10 #include "nsRefreshDriver.h"
  11
  12 nsICanvasRenderingContextInternal::nsICanvasRenderingContextInternal()
  13     : mSharedPtrPtr(
  14           std::make_shared<nsICanvasRenderingContextInternal*>(this)) {}
  15
  16 nsICanvasRenderingContextInternal::~nsICanvasRenderingContextInternal() =
  17     default;
  18
  19 mozilla::PresShell* nsICanvasRenderingContextInternal::GetPresShell() {
  20   if (mCanvasElement) {
  21     return mCanvasElement->OwnerDoc()->GetPresShell();
  22   }
  23   return nullptr;
  24 }
  25
  26 void nsICanvasRenderingContextInternal::RemovePostRefreshObserver() {
  27   if (mRefreshDriver) {
  28     mRefreshDriver->RemovePostRefreshObserver(this);
  29     mRefreshDriver = nullptr;
  30   }
  31 }
  32
  33 void nsICanvasRenderingContextInternal::AddPostRefreshObserverIfNecessary() {
  34   if (!GetPresShell() || !GetPresShell()->GetPresContext() ||
  35       !GetPresShell()->GetPresContext()->RefreshDriver()) {
  36     return;
  37   }
  38   mRefreshDriver = GetPresShell()->GetPresContext()->RefreshDriver();
  39   mRefreshDriver->AddPostRefreshObserver(this);
  40 }