/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsICanvasRenderingContextInternal.h"

#include "mozilla/dom/CanvasUtils.h"
#include "mozilla/dom/Document.h"
#include "mozilla/PresShell.h"
#include "nsRefreshDriver.h"

nsICanvasRenderingContextInternal::nsICanvasRenderingContextInternal() =
    default;

nsICanvasRenderingContextInternal::~nsICanvasRenderingContextInternal() =
    default;

mozilla::PresShell* nsICanvasRenderingContextInternal::GetPresShell() {
  if (mCanvasElement) {
    return mCanvasElement->OwnerDoc()->GetPresShell();
  }
  return nullptr;
}

nsIGlobalObject* nsICanvasRenderingContextInternal::GetParentObject() const {
  if (mCanvasElement) {
    return mCanvasElement->OwnerDoc()->GetScopeObject();
  }
  if (mOffscreenCanvas) {
    return mOffscreenCanvas->GetParentObject();
  }
  return nullptr;
}

nsIPrincipal* nsICanvasRenderingContextInternal::PrincipalOrNull() const {
  if (mCanvasElement) {
    return mCanvasElement->NodePrincipal();
  }
  if (mOffscreenCanvas) {
    nsIGlobalObject* global = mOffscreenCanvas->GetParentObject();
    if (global) {
      return global->PrincipalOrNull();
    }
  }
  return nullptr;
}

void nsICanvasRenderingContextInternal::RemovePostRefreshObserver() {
  if (mRefreshDriver) {
    mRefreshDriver->RemovePostRefreshObserver(this);
    mRefreshDriver = nullptr;
  }
}

void nsICanvasRenderingContextInternal::AddPostRefreshObserverIfNecessary() {
  if (!GetPresShell() || !GetPresShell()->GetPresContext() ||
      !GetPresShell()->GetPresContext()->RefreshDriver()) {
    return;
  }
  mRefreshDriver = GetPresShell()->GetPresContext()->RefreshDriver();
  mRefreshDriver->AddPostRefreshObserver(this);
}

void nsICanvasRenderingContextInternal::DoSecurityCheck(
    nsIPrincipal* aPrincipal, bool aForceWriteOnly, bool aCORSUsed) {
  if (mCanvasElement) {
    mozilla::CanvasUtils::DoDrawImageSecurityCheck(mCanvasElement, aPrincipal,
                                                   aForceWriteOnly, aCORSUsed);
  } else if (mOffscreenCanvas) {
    mozilla::CanvasUtils::DoDrawImageSecurityCheck(mOffscreenCanvas, aPrincipal,
                                                   aForceWriteOnly, aCORSUsed);
  }
}