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b936c00a65
Differential Revision: https://phabricator.services.mozilla.com/D21115 --HG-- extra : rebase_source : 4d65c07d8822f3a54ac881b5d0f55468ce884554
114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* a CSS style sheet returned from nsIStyleSheetService.preloadSheet */
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#include "PreloadedStyleSheet.h"
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#include "mozilla/css/Loader.h"
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#include "mozilla/dom/Promise.h"
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#include "nsICSSLoaderObserver.h"
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#include "nsLayoutUtils.h"
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namespace mozilla {
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PreloadedStyleSheet::PreloadedStyleSheet(nsIURI* aURI,
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css::SheetParsingMode aParsingMode)
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: mLoaded(false), mURI(aURI), mParsingMode(aParsingMode) {}
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/* static */
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nsresult PreloadedStyleSheet::Create(nsIURI* aURI,
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css::SheetParsingMode aParsingMode,
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PreloadedStyleSheet** aResult) {
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*aResult = nullptr;
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RefPtr<PreloadedStyleSheet> preloadedSheet =
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new PreloadedStyleSheet(aURI, aParsingMode);
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preloadedSheet.forget(aResult);
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return NS_OK;
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}
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PreloadedStyleSheet)
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NS_INTERFACE_MAP_ENTRY(nsIPreloadedStyleSheet)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(PreloadedStyleSheet)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(PreloadedStyleSheet)
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NS_IMPL_CYCLE_COLLECTION(PreloadedStyleSheet, mSheet)
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nsresult PreloadedStyleSheet::GetSheet(StyleSheet** aResult) {
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*aResult = nullptr;
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MOZ_DIAGNOSTIC_ASSERT(mLoaded);
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if (!mSheet) {
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RefPtr<css::Loader> loader = new css::Loader;
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nsresult rv = loader->LoadSheetSync(mURI, mParsingMode, true, &mSheet);
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NS_ENSURE_SUCCESS(rv, rv);
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MOZ_ASSERT(mSheet);
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}
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*aResult = mSheet;
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return NS_OK;
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}
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nsresult PreloadedStyleSheet::Preload() {
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MOZ_DIAGNOSTIC_ASSERT(!mLoaded);
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// The nsIStyleSheetService.preloadSheet API doesn't tell us which backend
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// the sheet will be used with, and it seems wasteful to eagerly create
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// both a CSSStyleSheet and a ServoStyleSheet. So instead, we guess that
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// the sheet type we will want matches the current value of the stylo pref,
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// and preload a sheet of that type.
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//
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// If we guess wrong, we will re-load the sheet later with the requested type,
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// and we won't really have front loaded the loading time as the name
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// "preload" might suggest. Also, in theory we could get different data from
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// fetching the URL again, but for the usage patterns of this API this is
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// unlikely, and it doesn't seem worth trying to store the contents of the URL
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// and duplicating a bunch of css::Loader's logic.
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mLoaded = true;
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StyleSheet* sheet;
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return GetSheet(&sheet);
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}
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NS_IMPL_ISUPPORTS(PreloadedStyleSheet::StylesheetPreloadObserver,
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nsICSSLoaderObserver)
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NS_IMETHODIMP
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PreloadedStyleSheet::StylesheetPreloadObserver::StyleSheetLoaded(
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StyleSheet* aSheet, bool aWasDeferred, nsresult aStatus) {
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MOZ_DIAGNOSTIC_ASSERT(!mPreloadedSheet->mLoaded);
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mPreloadedSheet->mLoaded = true;
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if (NS_FAILED(aStatus)) {
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mPromise->MaybeReject(aStatus);
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} else {
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mPromise->MaybeResolve(mPreloadedSheet);
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}
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return NS_OK;
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}
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// Note: After calling this method, the preloaded sheet *must not* be used
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// until the observer is notified that the sheet has finished loading.
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nsresult PreloadedStyleSheet::PreloadAsync(NotNull<dom::Promise*> aPromise) {
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MOZ_DIAGNOSTIC_ASSERT(!mLoaded);
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RefPtr<css::Loader> loader = new css::Loader;
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RefPtr<StylesheetPreloadObserver> obs =
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new StylesheetPreloadObserver(aPromise, this);
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return loader->LoadSheet(mURI, mParsingMode, false, obs, &mSheet);
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}
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} // namespace mozilla
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