RESOLVED INVALID 125911
Subpixel layout: roundedLayoutPoint(FloatPoint) should CSS pixel round (nytimes.com). 
https://bugs.webkit.org/show_bug.cgi?id=125911
Summary Subpixel layout: roundedLayoutPoint(FloatPoint) should CSS pixel round (nytim...
zalan
Reported 2013-12-17 22:15:47 PST
Created attachment 219505 [details] test case This is a placeholders to discuss the rounding strategy (if needed at all) 'Moves' text is calculated to be at 71.649414px which gets rounded to 72px with subpixel off, while to 4544 (71*64) with subpixel on by calling setLocation(roundedLayoutPoint(box.topLeft())); at RenderBox::positionLineBox. <html> <head> <style> body { font-size: 53px; } span { display: inline-block; border: solid 1px red; } div { width: 212px; border: solid 1px blue; } </style> </head> <body> There should be no gap between the red and the blue borders at the right side. <div>foo<span>moves</span></div> </body> </html>
Attachments
test case (337 bytes, text/html)
2013-12-17 22:15 PST, zalan 		no flags
Details
screenshot(nytimes.com) (558.85 KB, image/gif)
2013-12-20 16:58 PST, zalan 		no flags
Details
test case (roundedLayoutPoint(box.topLeft()) (306 bytes, text/html)
2013-12-26 17:13 PST, zalan 		no flags
Details
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
zalan
Comment 1 2013-12-17 22:17:01 PST
frame #0: 0x0000000105bd6438 WebCore`WebCore::RenderBox::positionLineBox(this=0x00007fb70ad63bb0, box=0x00007fb70ad67af0) + 440 at RenderBox.cpp:2003 frame #1: 0x0000000105ba7dbe WebCore`WebCore::RenderBlockFlow::computeBlockDirectionPositionsForLine(this=0x00007fb70ad81150, lineBox=0x00007fb70ad639b0, firstRun=0x00007fb70ad98ac0, textBoxDataMap=0x00007fff5eb769b8, verticalPositionCache=0x00007fff5eb77ea0) + 446 at RenderBlockLineLayout.cpp:776 frame #2: 0x0000000105ba80e6 WebCore`WebCore::RenderBlockFlow::createLineBoxesFromBidiRuns(this=0x00007fb70ad81150, bidiRuns=0x00007fff5eb781d8, end=0x00007fff5eb77f40, lineInfo=0x00007fff5eb78430, verticalPositionCache=0x00007fff5eb77ea0, trailingSpaceRun=0x0000000000000000, wordMeasurements=0x00007fff5eb76dd0) + 486 at RenderBlockLineLayout.cpp:998 frame #3: 0x0000000105baa169 WebCore`WebCore::RenderBlockFlow::layoutRunsAndFloatsInRange(this=0x00007fb70ad81150, layoutState=0x00007fff5eb78430, resolver=0x00007fff5eb78118, cleanLineStart=0x00007fff5eb780c8, cleanLineBidiStatus=0x00007fff5eb780b0, consecutiveHyphenatedLines=0) + 3209 at RenderBlockLineLayout.cpp:1381 frame #4: 0x0000000105ba8699 WebCore`WebCore::RenderBlockFlow::layoutRunsAndFloats(this=0x00007fb70ad81150, layoutState=0x00007fff5eb78430, hasInlineChild=true) + 1177 at RenderBlockLineLayout.cpp:1094 frame #5: 0x0000000105bae3a1 WebCore`WebCore::RenderBlockFlow::layoutLineBoxes(this=0x00007fb70ad81150, relayoutChildren=true, repaintLogicalTop=0x00007fff5eb78888, repaintLogicalBottom=0x00007fff5eb78880) + 1969 at RenderBlockLineLayout.cpp:1686 frame #6: 0x00000001063e00f1 WebCore`WebCore::RenderBlockFlow::layoutInlineChildren(this=0x00007fb70ad81150, relayoutChildren=true, repaintLogicalTop=0x00007fff5eb78888, repaintLogicalBottom=0x00007fff5eb78880) + 433 at RenderBlockFlow.cpp:536 frame #7: 0x00000001063df365 WebCore`WebCore::RenderBlockFlow::layoutBlock(this=0x00007fb70ad81150, relayoutChildren=true, pageLogicalHeight=LayoutUnit at 0x00007fff5eb78910) + 1189 at RenderBlockFlow.cpp:361 frame #8: 0x0000000105b6cded WebCore`WebCore::RenderBlock::layout(this=0x00007fb70ad81150) + 125 at RenderBlock.cpp:1323 frame #9: 0x00000001063e274b WebCore`WebCore::RenderBlockFlow::layoutBlockChild(this=0x00007fb70ad67a30, child=0x00007fb70ad81150, marginInfo=0x00007fff5eb78d98, previousFloatLogicalBottom=0x00007fff5eb78d78, maxFloatLogicalBottom=0x00007fff5eb79078) + 1323 at RenderBlockFlow.cpp:597 frame #10: 0x00000001063e0371 WebCore`WebCore::RenderBlockFlow::layoutBlockChildren(this=0x00007fb70ad67a30, relayoutChildren=true, maxFloatLogicalBottom=0x00007fff5eb79078) + 625 at RenderBlockFlow.cpp:516 frame #11: 0x00000001063df388 WebCore`WebCore::RenderBlockFlow::layoutBlock(this=0x00007fb70ad67a30, relayoutChildren=true, pageLogicalHeight=LayoutUnit at 0x00007fff5eb79110) + 1224 at RenderBlockFlow.cpp:363 frame #12: 0x0000000105b6cded WebCore`WebCore::RenderBlock::layout(this=0x00007fb70ad67a30) + 125 at RenderBlock.cpp:1323 frame #13: 0x00000001063e274b WebCore`WebCore::RenderBlockFlow::layoutBlockChild(this=0x00007fb70ad78f10, child=0x00007fb70ad67a30, marginInfo=0x00007fff5eb79598, previousFloatLogicalBottom=0x00007fff5eb79578, maxFloatLogicalBottom=0x00007fff5eb79878) + 1323 at RenderBlockFlow.cpp:597 frame #14: 0x00000001063e0371 WebCore`WebCore::RenderBlockFlow::layoutBlockChildren(this=0x00007fb70ad78f10, relayoutChildren=true, maxFloatLogicalBottom=0x00007fff5eb79878) + 625 at RenderBlockFlow.cpp:516 frame #15: 0x00000001063df388 WebCore`WebCore::RenderBlockFlow::layoutBlock(this=0x00007fb70ad78f10, relayoutChildren=true, pageLogicalHeight=LayoutUnit at 0x00007fff5eb79910) + 1224 at RenderBlockFlow.cpp:363 frame #16: 0x0000000105b6cded WebCore`WebCore::RenderBlock::layout(this=0x00007fb70ad78f10) + 125 at RenderBlock.cpp:1323 frame #17: 0x00000001063e274b WebCore`WebCore::RenderBlockFlow::layoutBlockChild(this=0x00007fb70ad5ea20, child=0x00007fb70ad78f10, marginInfo=0x00007fff5eb79d98, previousFloatLogicalBottom=0x00007fff5eb79d78, maxFloatLogicalBottom=0x00007fff5eb7a078) + 1323 at RenderBlockFlow.cpp:597 frame #18: 0x00000001063e0371 WebCore`WebCore::RenderBlockFlow::layoutBlockChildren(this=0x00007fb70ad5ea20, relayoutChildren=true, maxFloatLogicalBottom=0x00007fff5eb7a078) + 625 at RenderBlockFlow.cpp:516 frame #19: 0x00000001063df388 WebCore`WebCore::RenderBlockFlow::layoutBlock(this=0x00007fb70ad5ea20, relayoutChildren=true, pageLogicalHeight=LayoutUnit at 0x00007fff5eb7a110) + 1224 at RenderBlockFlow.cpp:363 frame #20: 0x0000000105b6cded WebCore`WebCore::RenderBlock::layout(this=0x00007fb70ad5ea20) + 125 at RenderBlock.cpp:1323 frame #21: 0x0000000105e3267d WebCore`WebCore::RenderView::layoutContent(this=0x00007fb70ad5ea20, state=0x00007fb70ad80fa0) + 93 at RenderView.cpp:158 frame #22: 0x0000000105e33827 WebCore`WebCore::RenderView::layout(this=0x00007fb70ad5ea20) + 2087 at RenderView.cpp:342 frame #23: 0x0000000104eeb1ce WebCore`WebCore::FrameView::layout(this=0x00007fb70ad6d8e0, allowSubtree=true) + 3422 at FrameView.cpp:1261 frame #24: 0x0000000104bfb910 WebCore`WebCore::Document::implicitClose(this=0x00007fb70b843600) + 1008 at Document.cpp:2472 frame #25: 0x0000000104eb4beb WebCore`WebCore::FrameLoader::checkCallImplicitClose(this=0x00007fb70ad39e58) + 155 at FrameLoader.cpp:849 frame #26: 0x0000000104eb4866 WebCore`WebCore::FrameLoader::checkCompleted(this=0x00007fb70ad39e58) + 358 at FrameLoader.cpp:792 frame #27: 0x0000000104eb3178 WebCore`WebCore::FrameLoader::finishedParsing(this=0x00007fb70ad39e58) + 184 at FrameLoader.cpp:725 frame #28: 0x0000000104c0670b WebCore`WebCore::Document::finishedParsing(this=0x00007fb70b843600) + 379 at Document.cpp:4490 frame #29: 0x000000010504b758 WebCore`WebCore::HTMLConstructionSite::finishedParsing(this=0x00007fb70ad83388) + 24 at HTMLConstructionSite.cpp:347 frame #30: 0x0000000105157767 WebCore`WebCore::HTMLTreeBuilder::finished(this=0x00007fb70ad83370) + 183 at HTMLTreeBuilder.cpp:3056 frame #31: 0x000000010506fa2e WebCore`WebCore::HTMLDocumentParser::end(this=0x00007fb70ad69100) + 174 at HTMLDocumentParser.cpp:749 frame #32: 0x000000010506e512 WebCore`WebCore::HTMLDocumentParser::attemptToRunDeferredScriptsAndEnd(this=0x00007fb70ad69100) + 242 at HTMLDocumentParser.cpp:760 frame #33: 0x000000010506e33f WebCore`WebCore::HTMLDocumentParser::prepareToStopParsing(this=0x00007fb70ad69100) + 271 at HTMLDocumentParser.cpp:203 frame #34: 0x000000010506fa83 WebCore`WebCore::HTMLDocumentParser::attemptToEnd(this=0x00007fb70ad69100) + 67 at HTMLDocumentParser.cpp:772 frame #35: 0x000000010506fad8 WebCore`WebCore::HTMLDocumentParser::finish(this=0x00007fb70ad69100) + 72 at HTMLDocumentParser.cpp:821 frame #36: 0x0000000104c7577a WebCore`WebCore::DocumentWriter::end(this=0x00007fb70b034aa0) + 346 at DocumentWriter.cpp:245 frame #37: 0x0000000104c41da6 WebCore`WebCore::DocumentLoader::finishedLoading(this=0x00007fb70b034a00, finishTime=0) + 598 at DocumentLoader.cpp:408 frame #38: 0x0000000104c41abe WebCore`WebCore::DocumentLoader::notifyFinished(this=0x00007fb70b034a00, resource=0x00007fb70c4336e0) + 270 at DocumentLoader.cpp:345 frame #39: 0x00000001048635cd WebCore`WebCore::CachedResource::checkNotify(this=0x00007fb70c4336e0) + 109 at CachedResource.cpp:369 frame #40: 0x00000001048636e4 WebCore`WebCore::CachedResource::finishLoading(this=0x00007fb70c4336e0, =0x00007fb70ad7d6e0) + 52 at CachedResource.cpp:385 frame #41: 0x000000010485ddeb WebCore`WebCore::CachedRawResource::finishLoading(this=0x00007fb70c4336e0, data=0x00007fb70ad7d6e0) + 187 at CachedRawResource.cpp:94 frame #42: 0x000000010605e298 WebCore`WebCore::SubresourceLoader::didFinishLoading(this=0x00007fb70b11a400, finishTime=0) + 440 at SubresourceLoader.cpp:279 frame #43: 0x0000000105e60815 WebCore`WebCore::ResourceLoader::didFinishLoading(this=0x00007fb70b11a400, =0x00007fb70ac1c950, finishTime=0) + 53 at ResourceLoader.cpp:487
zalan
Comment 2 2013-12-17 22:19:28 PST
<rdar://problem/15687112>
Simon Fraser (smfr)
Comment 3 2013-12-18 11:41:33 PST
Dave Hyatt should say whether the line box tree should be converted from floats to LayoutUnits, or how to round the line box floats to LayoutUnits.
zalan
Comment 4 2013-12-20 16:58:50 PST
Created attachment 219812 [details] screenshot(nytimes.com) anim gif to demonstrate the off-by-one issue.
zalan
Comment 5 2013-12-26 17:13:57 PST
Created attachment 220041 [details] test case (roundedLayoutPoint(box.topLeft())
zalan
Comment 6 2014-01-08 14:04:33 PST
failed cases: fast/css/resize-corner-tracking-transformed-iframe.html [ Failure ] fast/css/resize-corner-tracking-transformed.html [ Failure ] fast/events/document-elementFromPoint.html [ Failure ] fast/events/offsetX-offsetY.html [ Failure ] fast/regions/cssom/get-regions-by-content-horiz-bt.html [ Failure ] fast/regions/cssom/get-regions-by-content-vert-rl.html [ Failure ] fast/regions/overflow-region-transform.html [ ImageOnlyFailure ]
zalan
Comment 7 2014-01-15 10:01:15 PST
We match FF's (v26) behavior.
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