144499 2015-05-01 13:58:08 -0700 Postpone caption style sheet creation 2015-05-01 18:16:13 -0700 1 1 1 Unclassified WebKit Media 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 eric.carlson eric.carlson webkit-bug-importer oldest_to_newest 1090876 0 eric.carlson 2015-05-01 13:58:08 -0700 CaptionUserPreferences::updateCaptionStyleSheetOverride() is called when a <video> element is created. This is a fairly expensive operation and the style sheet it generates is only needed when the <video> has captions, so it should be postponed as long as possible. 1090877 1 eric.carlson 2015-05-01 13:58:34 -0700 rdar://problem/20691225 1090992 2 252203 eric.carlson 2015-05-01 17:19:51 -0700 Created attachment 252203 Proposed patch. 1090997 3 252203 simon.fraser 2015-05-01 17:32:56 -0700 Comment on attachment 252203 Proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=252203&action=review > Source/WebCore/html/HTMLMediaElement.cpp:480 > + if (m_haveRegisteredForCaptionPreferenceChanges) > + document.unregisterForCaptionPreferencesChangedCallbacks(this); Does this need to set m_haveRegisteredForCaptionPreferenceChanges=false? Or maybe my suggested rename would clarify. > Source/WebCore/html/HTMLMediaElement.h:888 > + bool m_haveRegisteredForCaptionPreferenceChanges { false }; Would this be better as m_hasHadTextTrack? 1091000 4 252203 eric.carlson 2015-05-01 17:41:28 -0700 Comment on attachment 252203 Proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=252203&action=review >> Source/WebCore/html/HTMLMediaElement.cpp:480 >> + document.unregisterForCaptionPreferencesChangedCallbacks(this); > > Does this need to set m_haveRegisteredForCaptionPreferenceChanges=false? Or maybe my suggested rename would clarify. No, because we want to re-register if the element is inserted back into the DOM (like the layout test does). I will rename it. 1091009 5 252203 simon.fraser 2015-05-01 17:55:01 -0700 Comment on attachment 252203 Proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=252203&action=review > Source/WebCore/page/CaptionUserPreferencesMediaAF.cpp:200 > + // Generating and registering the caption stylesheet can be expensive and this method is called indirectly when the parser creates an audio or Maybe early return on if (m_listeningForPreferenceChanges) before this whole block. 1091017 6 eric.carlson 2015-05-01 18:16:01 -0700 Committed r183705: https://trac.webkit.org/r183705 252203 2015-05-01 17:19:51 -0700 2015-05-01 18:16:13 -0700 Proposed patch. patch_1.txt text/plain 9646 eric.carlson SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE4MzcwMCkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI3IEBACisyMDE1LTA1LTAxICBFcmljIENh cmxzb24gIDxlcmljLmNhcmxzb25AYXBwbGUuY29tPgorCisgICAgICAgIFBvc3Rwb25lIGNhcHRp 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