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756d5f5a9a
Here we add a new UserFontLoadState value, STATUS_LOAD_PENDING, which represents the state just after a gfxUserFontEntry's url()-valued source would being loading, except that we can't start the load due to being on a Servo style worker thread. In that case, we defer the work of initiating the load until just after the Servo traversal is finished. URLs that can normally be loaded synchronously, such as data: URLs and script-implemented protocols marked as synchronous, must be handled asynchronously when encountered during Servo traversal, since various main-thread only work (in FontFaceSet::SyncLoadFontData) must happen. This is a user visible change from stock Gecko, but should only happen when font metrics for a data: URL font are requested due to ch/ex unit resolution when layout hasn't previously requested the font load. Hopefully nobody relies on synchronous resolution of ch/ex units with data: URLs. We unfortunately also can't pick gfxUserFontEntry objects out of the UserFontCache during Servo traversal, since validating the cache entry involves doing content policy checking, which is not thread-safe (due in part to taking strong references to nsIPrincipals). Platform fonts and ArrayBuffer-backed DOM FontFace objects continue to be handled synchronously. The PostTraversalTask does not take a strong reference to the gfxUserFontEntry object, since it is held on to by the DOM FontFace object, which itself won't go away before the PostTraversalTask is run. MozReview-Commit-ID: J9ODLsusrNV --HG-- extra : rebase_source : d3e3d1dc187cb252750b57bcecd0b1ed77a15a7c
46 lines
1.2 KiB
C++
46 lines
1.2 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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#include "PostTraversalTask.h"
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#include "mozilla/dom/FontFace.h"
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#include "mozilla/dom/FontFaceSet.h"
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#include "gfxUserFontSet.h"
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namespace mozilla {
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using namespace dom;
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void
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PostTraversalTask::Run()
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{
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switch (mType) {
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case Type::ResolveFontFaceLoadedPromise:
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static_cast<FontFace*>(mTarget)->DoResolve();
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break;
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case Type::RejectFontFaceLoadedPromise:
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static_cast<FontFace*>(mTarget)->DoReject(mResult);
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break;
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case Type::DispatchLoadingEventAndReplaceReadyPromise:
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static_cast<FontFaceSet*>(mTarget)->
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DispatchLoadingEventAndReplaceReadyPromise();
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break;
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case Type::DispatchFontFaceSetCheckLoadingFinishedAfterDelay:
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static_cast<FontFaceSet*>(mTarget)->
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DispatchCheckLoadingFinishedAfterDelay();
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break;
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case Type::LoadFontEntry:
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static_cast<gfxUserFontEntry*>(mTarget)->ContinueLoad();
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break;
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}
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}
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} // namespace mozilla
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