195743 2019-03-14 05:33:04 -0700 Optimize Region for single rectangle case 2019-03-15 08:44:17 -0700 1 1 1 Unclassified WebKit Platform WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 koivisto webkit-unassigned cdumez cmarcelo commit-queue ews-watchlist kondapallykalyan luiz noam simon.fraser webkit-bug-importer zalan oldest_to_newest 1516487 0 koivisto 2019-03-14 05:33:04 -0700 Instrumentation shows vast majority of Region objects consist of a single rectangle. However it always allocates the large Shape data structure. This makes it unsuitable to use as a member in any popular objects. 1516490 1 364656 koivisto 2019-03-14 06:00:19 -0700 Created attachment 364656 patch 1516502 2 364659 koivisto 2019-03-14 08:14:27 -0700 Created attachment 364659 patch 1516506 3 364659 simon.fraser 2019-03-14 08:57:05 -0700 Comment on attachment 364659 patch View in context: https://bugs.webkit.org/attachment.cgi?id=364659&action=review > Source/WebCore/platform/graphics/Region.cpp:60 > +Region::~Region() = default > Source/WebCore/platform/graphics/Region.cpp:85 > + if (!m_bounds.isEmpty()) > + rects.append(m_bounds); > + return rects; Since this is the common case, maybe reserveInitialCapacity(1) and uncheckedAppend here, avoiding wasted vector capacity. > Source/WebCore/platform/graphics/Region.h:189 > + return a.m_bounds == b.m_bounds && arePointingToEqualData(a.m_shape, b.m_shape); very nice > Source/WebCore/platform/graphics/Region.h:226 > + Optional<size_t> segmentIndex; > + decoder >> segmentIndex; I don't really find this use of Optional<> and decoder >> much clearer than testing for decode success directly. 1516508 4 364659 cdumez 2019-03-14 08:59:26 -0700 Comment on attachment 364659 patch View in context: https://bugs.webkit.org/attachment.cgi?id=364659&action=review >> Source/WebCore/platform/graphics/Region.h:226 >> + decoder >> segmentIndex; > > I don't really find this use of Optional<> and decoder >> much clearer than testing for decode success directly. It's not really about readability though. The reason we changed the way we decode was to not require a default constructor for the classes being decoded. 1516533 5 simon.fraser 2019-03-14 10:52:52 -0700 (In reply to Chris Dumez from comment #4) > It's not really about readability though. The reason we changed the way we > decode was to not require a default constructor for the classes being > decoded. Makes sense. 1516938 6 364783 koivisto 2019-03-15 02:27:22 -0700 Created attachment 364783 patch 1516945 7 364785 koivisto 2019-03-15 03:21:36 -0700 Created attachment 364785 patch 1516951 8 364789 koivisto 2019-03-15 03:53:44 -0700 Created attachment 364789 patch 1516958 9 364790 koivisto 2019-03-15 06:17:28 -0700 Created attachment 364790 patch 1516959 10 364791 koivisto 2019-03-15 06:22:16 -0700 Created attachment 364791 patch 1516961 11 364793 koivisto 2019-03-15 07:00:54 -0700 Created attachment 364793 patch 1516962 12 364794 koivisto 2019-03-15 07:23:36 -0700 Created attachment 364794 patch 1516964 13 364795 koivisto 2019-03-15 07:45:37 -0700 Created attachment 364795 patch 1516978 14 364795 commit-queue 2019-03-15 08:43:26 -0700 Comment on attachment 364795 patch Clearing flags on attachment: 364795 Committed r242995: <https://trac.webkit.org/changeset/242995> 1516979 15 commit-queue 2019-03-15 08:43:28 -0700 All reviewed patches have been landed. Closing bug. 1516980 16 webkit-bug-importer 2019-03-15 08:44:17 -0700 <rdar://problem/48925684> 364656 2019-03-14 06:00:19 -0700 2019-03-14 08:14:27 -0700 patch region-rect-optimize.patch text/plain 27415 koivisto SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDI0MjgzMCkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDY2IEBACisyMDE5LTAzLTE0ICBBbnR0aSBL b2l2aXN0byAgPGFudHRpQGFwcGxlLmNvbT4KKworICAgICAgICBPcHRpbWl6ZSBSZWdpb24gZm9y IHNpbmdsZSByZWN0YW5nbGUgY2FzZQorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9z aG93X2J1Zy5jZ2k/aWQ9MTk1NzQzCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BT ISkuCisKKyAgICAgICAgSW5zdHJ1bWVudGF0aW9uIHNob3dzIHZhc3QgbWFqb3JpdHkgb2YgUmVn aW9uIG9iamVjdHMgY29uc2lzdCBvZiBhIHNpbmdsZSByZWN0YW5nbGUuIEhvd2V2ZXIgaXQgYWx3 YXlzIGFsbG9jYXRlcworICAgICAgICB0aGUgbGFyZ2UgU2hhcGUgZGF0YSBzdHJ1Y3R1cmUuIFRo 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