202548 2019-10-03 16:29:09 -0700 FontFaceSet's ready promise is not always resolved 2019-10-10 12:53:02 -0700 1 1 1 Unclassified WebKit Text WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=202476 InRadar P2 Normal --- 1 mmaxfield mmaxfield cdumez dino esprehn+autocc ews-watchlist glenn gyuyoung.kim jonlee macpherson menard mmaxfield simon.fraser thorton webkit-bug-importer youennf oldest_to_newest 1576637 0 mmaxfield 2019-10-03 16:29:09 -0700 When we do layout on an element, FontRanges::glyphDataForCharacter() will cause the first available font to start loading, but will continue looking at subsequent fonts to see if there's a good one we can render while the load is happening. When looking for a fallback font, it calls FontRanges::Range::font() with a ExternalResourceDownloadPolicy set to Forbid. This is fine, except that a side effect of calling this function is that the CSSFontFace marks itself as Loading, which means document.fonts.ready is deferred. Then, the load finishes, and the subsequent CSSFontFace is never actually used, meaning it never exits the Loading state, which means document.fonts.ready never fires. 1576638 1 380167 mmaxfield 2019-10-03 16:29:39 -0700 Created attachment 380167 Test 1576639 2 mmaxfield 2019-10-03 16:30:32 -0700 This was discovered during Chris's investigation of https://bugs.webkit.org/show_bug.cgi?id=202476. 1576640 3 mmaxfield 2019-10-03 16:33:14 -0700 The fix for this is likely in CSSFontFace::pump() where it setStatus(Status::Loading) right before source->load(). 1576647 4 380169 mmaxfield 2019-10-03 17:00:13 -0700 Created attachment 380169 Patch 1576870 5 380169 cdumez 2019-10-04 08:36:04 -0700 Comment on attachment 380169 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=380169&action=review > Source/WebCore/css/CSSFontFace.cpp:740 > + if (policy == ExternalResourceDownloadPolicy::Allow && m_status == Status::Pending) I have one concern. Imagine the case where this is a local font and this local font ends up being successful and Policy is ExternalResourceDownloadPolicy::Forbid. Previously, we would do: 1. Status update: Pending -> Loading 2. Call load() 3. Then below, source->status() returns Success 4. Status update: Loading -> Success (See switch below). After your change: 1. Call load() without status update, so we are Pending 2. Then below, source->status() returns Success 3. Status update: Pending -> Loading Now we're stuck in Loading state even though our source successfully loaded, right? 1576871 6 380169 cdumez 2019-10-04 08:39:07 -0700 Comment on attachment 380169 Patch cq- to make sure this does not inadvertently committed before answering my comment. If my comment is inaccurate, feel free to override and cq+. 1578789 7 380169 mmaxfield 2019-10-10 12:38:52 -0700 Comment on attachment 380169 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=380169&action=review >> Source/WebCore/css/CSSFontFace.cpp:740 >> + if (policy == ExternalResourceDownloadPolicy::Allow && m_status == Status::Pending) > > I have one concern. > > Imagine the case where this is a local font and this local font ends up being successful and Policy is ExternalResourceDownloadPolicy::Forbid. Previously, we would do: > 1. Status update: Pending -> Loading > 2. Call load() > 3. Then below, source->status() returns Success > 4. Status update: Loading -> Success (See switch below). > > After your change: > 1. Call load() without status update, so we are Pending > 2. Then below, source->status() returns Success > 3. Status update: Pending -> Loading > > Now we're stuck in Loading state even though our source successfully loaded, right? The next two lines after the Pending -> Loading transition is if (m_status == Status::Loading || m_status == Status::TimedOut) setStatus(Status::Success); We just set the status to Loading, so we take this "if" branch and set the status to success. I'll add a test. 1578792 8 mmaxfield 2019-10-10 12:42:25 -0700 Committed r250983: <https://trac.webkit.org/changeset/250983> 1578793 9 webkit-bug-importer 2019-10-10 12:43:17 -0700 <rdar://problem/56165070> 1578797 10 380169 cdumez 2019-10-10 12:53:02 -0700 Comment on attachment 380169 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=380169&action=review >>> Source/WebCore/css/CSSFontFace.cpp:740 >>> + if (policy == ExternalResourceDownloadPolicy::Allow && m_status == Status::Pending) >> >> I have one concern. >> >> Imagine the case where this is a local font and this local font ends up being successful and Policy is ExternalResourceDownloadPolicy::Forbid. Previously, we would do: >> 1. Status update: Pending -> Loading >> 2. Call load() >> 3. Then below, source->status() returns Success >> 4. Status update: Loading -> Success (See switch below). >> >> After your change: >> 1. Call load() without status update, so we are Pending >> 2. Then below, source->status() returns Success >> 3. Status update: Pending -> Loading >> >> Now we're stuck in Loading state even though our source successfully loaded, right? > > The next two lines after the Pending -> Loading transition is > > if (m_status == Status::Loading || m_status == Status::TimedOut) > setStatus(Status::Success); > > We just set the status to Loading, so we take this "if" branch and set the status to success. > > I'll add a test. Oh, duh. 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