author Lee Salzman <>
Sat, 28 Jan 2023 11:24:54 +0000
changeset 650885 f4f63f0138feb7535fa58c3f77fd8a51361371d8
parent 626550 c4ff74cf2f4d0c13674ec34be2675c727d4919ba
permissions -rw-r--r--
Bug 1812970 - Avoid using Skia's deprecated clip ops. r=jrmuizel Skia upstream removed deprecated clip ops that could be used to replace the clipping stack and bypass clips. We shouldn't really need to do this anymore, as we can work around it just using public APIs. The only SkCanvas operation that allows us to bypass clipping is writePixels, which still allows us to implement CopySurface/putImageData. Other instances where we were using the replace op for DrawTargetWebgl layering support can just be worked around by creating a separate DrawTargetSkia pointing to the same pixel data, but on which no clipping or transforms are applied so that we can freely do drawing operations on it to the base layer pixel data regardless of any user-applied clipping. Differential Revision:

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 */

#ifndef mozilla_dom_SessionStoreUtils_h
#define mozilla_dom_SessionStoreUtils_h

#include "mozilla/Attributes.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/SessionStoreUtilsBinding.h"
#include "SessionStoreData.h"
#include "SessionStoreRestoreData.h"

class nsIDocument;
class nsGlobalWindowInner;

namespace mozilla {
class ErrorResult;

namespace dom {

class CanonicalBrowsingContext;
class GlobalObject;
struct SSScrollPositionDict;
class SSCacheCopy;
class SSSetItemInfo;

namespace sessionstore {
class DocShellRestoreState;
class FormData;
class FormEntry;
class StorageEntry;
}  // namespace sessionstore

class SessionStoreUtils {
  static void ForEachNonDynamicChildFrame(
      const GlobalObject& aGlobal, WindowProxyHolder& aWindow,
      SessionStoreUtilsFrameCallback& aCallback, ErrorResult& aRv);

  static already_AddRefed<nsISupports> AddDynamicFrameFilteredListener(
      const GlobalObject& aGlobal, EventTarget& aTarget, const nsAString& aType,
      JS::Handle<JS::Value> aListener, bool aUseCapture, bool aMozSystemGroup,
      ErrorResult& aRv);

  static void RemoveDynamicFrameFilteredListener(
      const GlobalObject& aGlobal, EventTarget& aTarget, const nsAString& aType,
      nsISupports* aListener, bool aUseCapture, bool aMozSystemGroup,
      ErrorResult& aRv);

  static void CollectDocShellCapabilities(const GlobalObject& aGlobal,
                                          nsIDocShell* aDocShell,
                                          nsCString& aRetVal);

  static void RestoreDocShellCapabilities(
      nsIDocShell* aDocShell, const nsCString& aDisallowCapabilities);
  static void RestoreDocShellCapabilities(
      const GlobalObject& aGlobal, nsIDocShell* aDocShell,
      const nsCString& aDisallowCapabilities) {
    return RestoreDocShellCapabilities(aDocShell, aDisallowCapabilities);

  static void CollectScrollPosition(const GlobalObject& aGlobal,
                                    WindowProxyHolder& aWindow,
                                    Nullable<CollectedData>& aRetVal);

  static void RestoreScrollPosition(const GlobalObject& aGlobal,
                                    nsGlobalWindowInner& aWindow,
                                    const CollectedData& data);
  static void RestoreScrollPosition(nsGlobalWindowInner& aWindow,
                                    const nsCString& aScrollPosition);

  static uint32_t CollectFormData(Document* aDocument,
                                  sessionstore::FormData& aFormData);

    @param aDocument: DOMDocument instance to obtain form data for.
    @param aGeneratedCount: the current number of XPath expressions in the
                            returned object.
  template <typename... ArgsT>
  static void CollectFromTextAreaElement(Document& aDocument,
                                         uint16_t& aGeneratedCount,
                                         ArgsT&&... args);
  template <typename... ArgsT>
  static void CollectFromInputElement(Document& aDocument,
                                      uint16_t& aGeneratedCount,
                                      ArgsT&&... args);
  template <typename... ArgsT>
  static void CollectFromSelectElement(Document& aDocument,
                                       uint16_t& aGeneratedCount,
                                       ArgsT&&... args);

  static void CollectFormData(const GlobalObject& aGlobal,
                              WindowProxyHolder& aWindow,
                              Nullable<CollectedData>& aRetVal);

  static bool RestoreFormData(const GlobalObject& aGlobal, Document& aDocument,
                              const CollectedData& aData);
  MOZ_CAN_RUN_SCRIPT static void RestoreFormData(
      Document& aDocument, const nsString& aInnerHTML,
      const nsTArray<SessionStoreRestoreData::Entry>& aEntries);

  static void ComposeInputData(const nsTArray<CollectedInputDataValue>& aData,
                               InputElementData& ret);

  MOZ_CAN_RUN_SCRIPT static already_AddRefed<nsISessionStoreRestoreData>
  ConstructSessionStoreRestoreData(const GlobalObject& aGlobal);

  MOZ_CAN_RUN_SCRIPT static already_AddRefed<Promise> InitializeRestore(
      const GlobalObject& aGlobal, CanonicalBrowsingContext& aContext,
      nsISessionStoreRestoreData* aData, ErrorResult& aError);

  static void RestoreDocShellState(
      nsIDocShell* aDocShell, const sessionstore::DocShellRestoreState& aState);

  static already_AddRefed<Promise> RestoreDocShellState(
      const GlobalObject& aGlobal, CanonicalBrowsingContext& aContext,
      const nsACString& aURL, const nsCString& aDocShellCaps,
      ErrorResult& aError);

  static void RestoreSessionStorageFromParent(
      const GlobalObject& aGlobal, const CanonicalBrowsingContext& aContext,
      const Record<nsCString, Record<nsString, nsString>>& aSessionStorage);

  static nsresult ConstructFormDataValues(
      JSContext* aCx, const nsTArray<sessionstore::FormEntry>& aValues,
      nsTArray<Record<nsString, OwningStringOrBooleanOrObject>::EntryType>&
      bool aParseSessionData = false);

  static nsresult ConstructSessionStorageValues(
      CanonicalBrowsingContext* aBrowsingContext,
      const nsTArray<SSCacheCopy>& aValues,
      Record<nsCString, Record<nsString, nsString>>& aStorage);

  static bool CopyProperty(JSContext* aCx, JS::Handle<JSObject*> aDst,
                           JS::Handle<JSObject*> aSrc, const nsAString& aName);

  template <typename T>
  static bool CopyChildren(JSContext* aCx, JS::Handle<JSObject*> aDst,
                           const nsTArray<RefPtr<T>>& aChildren) {
    if (!aChildren.IsEmpty()) {
      JS::Rooted<JSObject*> children(
          aCx, JS::NewArrayObject(aCx, aChildren.Length()));

      for (const auto index : IntegerRange(aChildren.Length())) {
        if (!aChildren[index]) {

        JS::Rooted<JSObject*> object(aCx);
        aChildren[index]->ToJSON(aCx, &object);

        if (!JS_DefineElement(aCx, children, index, object, JSPROP_ENUMERATE)) {
          return false;

      if (!JS_DefineProperty(aCx, aDst, "children", children,
                             JSPROP_ENUMERATE)) {
        return false;

    return true;

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_SessionStoreUtils_h