65123 2011-07-25 11:09:02 -0700 Font loading during layout can cause layout code to be re-entered via resource load delegate 2011-11-11 08:36:02 -0800 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mitz mitz abarth ap webkit-bug-importer oldest_to_newest 441752 0 mitz 2011-07-25 11:09:02 -0700 Font loading during layout can cause layout code to be re-entered via resource load delegate Here is an example: #import <Foundation/Foundation.h> #import <WebKit/WebKit.h> @interface ResourceLoadDelegate : NSObject { } @end @implementation ResourceLoadDelegate - (NSURLRequest *)webView:(WebView *)sender resource:(id)identifier willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse fromDataSource:(WebDataSource *)dataSource { if ([[[request URL] path] hasSuffix:@".ttf"]) { DOMElement *documentElement = [[[sender mainFrame] DOMDocument] documentElement]; [[documentElement style] setProperty:@"display" value:@"none" priority:@""]; [documentElement offsetTop]; } return request; } @end int main (int argc, const char * argv[]) { @autoreleasepool { WebView *webView = [[WebView alloc] initWithFrame:NSZeroRect frameName:nil groupName:[[NSBundle mainBundle] bundleIdentifier]]; ResourceLoadDelegate *delegate = [[ResourceLoadDelegate alloc] init]; webView.resourceLoadDelegate = delegate; [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.alistapart.com/d/cssatten/heid.html"]]]; [[NSRunLoop mainRunLoop] run]; } return 0; } 441753 1 webkit-bug-importer 2011-07-25 11:09:33 -0700 <rdar://problem/9835028> 441758 2 101886 mitz 2011-07-25 11:33:42 -0700 Created attachment 101886 Defer font loading using a zero-delay timer so that it does not happen during layout 441783 3 101886 andersca 2011-07-25 12:04:56 -0700 Comment on attachment 101886 Defer font loading using a zero-delay timer so that it does not happen during layout View in context: https://bugs.webkit.org/attachment.cgi?id=101886&action=review > Source/WebCore/css/CSSFontFaceSource.cpp:205 > + m_fontSelector.clear(); please use m_fontSelector = nullptr; here. 441807 4 mitz 2011-07-25 13:01:32 -0700 Fixed in <http://trac.webkit.org/r91699>. 441913 5 mitz 2011-07-25 15:26:26 -0700 I reverted r91699 in <http://trac.webkit.org/r91710> because some tests had relied on the synchronous behavior in the cached, error, and local cases. 442030 6 101952 mitz 2011-07-25 17:45:34 -0700 Created attachment 101952 Patch 442057 7 101952 darin 2011-07-25 18:29:00 -0700 Comment on attachment 101952 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=101952&action=review > Source/WebCore/css/CSSFontFaceSource.cpp:178 > + // the middle of layout, and the loader may invoke aribtrary delegate or event handler code. typo: aribtrary > Source/WebCore/css/CSSFontFaceSource.cpp:181 > + if (!m_startLoadingTimer.isActive()) > + m_startLoadingTimer.startOneShot(0); Sometimes it seems to me that these zero-length timers aren’t really timers. > Source/WebCore/css/CSSFontFaceSource.cpp:203 > + if (CachedResourceLoader* cachedResourceLoader = m_fontSelector->cachedResourceLoader()) > + m_font->beginLoadIfNeeded(cachedResourceLoader); Could just call it loader. > Source/WebCore/css/CSSFontFaceSource.h:81 > + Timer<CSSFontFaceSource> m_startLoadingTimer; That’s a verb phrase, not a noun phrase. Maybe m_loadStartTimer? > LayoutTests/ChangeLog:10 > + Unfortunately, font loading does not fire any DOM events, so in most cases > + a constant timeout had to be introduced. Wah! Well at least the timeout is only for test failures. 442085 8 mitz 2011-07-25 20:22:38 -0700 Committed <http://trac.webkit.org/r91738>. 442089 9 mitz 2011-07-25 20:37:52 -0700 Build fix in <http://trac.webkit.org/r91739>. 446761 10 abarth 2011-08-04 14:01:42 -0700 This patch appears to have made these tests flaky: svg/custom/svg-fonts-with-no-element-reference.html svg/custom/svg-fonts-without-missing-glyph.xhtml 500596 11 101952 zimmermann 2011-11-11 01:53:51 -0800 Comment on attachment 101952 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=101952&action=review > LayoutTests/fast/css/custom-font-xheight.html:59 > + }, 100); > } I just noticed Darins comment "Wah! Well at least the timeout is only for test failures.". I think this observation is wrong, the timeout affects these tests in general. According to chromiums flakiness dashboard Recent examples of failure from their dashboard: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=svg%2Fcustom%2Fsvg-fonts-fallback.xhtml%2Csvg%2Fcustom%2Fsvg-fonts-segmented.xhtml%2Csvg%2Ftext%2Ftext-overflow-ellipsis-svgfont.html&showExpectations=true I've spotted this while working with bashi on his testcase in bug 71765. To fix this fully we need to be able to listen for events indicating the custom font has finished loading. I think we could do this through window.internals, what do you think? 500800 12 mitz 2011-11-11 08:36:02 -0800 Sure would be nice to have a way to do this without a timer. 101886 2011-07-25 11:33:42 -0700 2011-07-25 17:45:30 -0700 Defer font loading using a zero-delay timer so that it does not happen during layout bug-65123-20110725113341.patch text/plain 4366 mitz SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDkxNjgzKQorKysgU291cmNlL1dlYkNvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMjEgQEAKKzIwMTEtMDctMjUgIERhbiBCZXJu c3RlaW4gIDxtaXR6QGFwcGxlLmNvbT4KKworICAgICAgICA8cmRhcjovL3Byb2JsZW0vOTgzNTAy OD4gRm9udCBsb2FkaW5nIGR1cmluZyBsYXlvdXQgY2FuIGNhdXNlIGxheW91dCBjb2RlIHRvIGJl IHJlLWVudGVyZWQgdmlhIHJlc291cmNlIGxvYWQgZGVsZWdhdGUKKyAgICAgICAgaHR0cHM6Ly9i dWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTY1MTIzCisKKyAgICAgICAgUmV2aWV3ZWQg 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