39884 2010-05-28 10:33:45 -0700 Full Page Zoom: rounding errors with element metrics 2012-10-08 16:14:57 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 60318 1 ojan webkit-unassigned djlee eae erosenthal gregsimon hyatt isherman komoroske leviw logingx tonikitoo oldest_to_newest 231778 0 ojan 2010-05-28 10:33:45 -0700 Google Spreadsheets has some bugs with rounding errors during full page zoom. The cause is the rounding to an int in adjustForLocalZoom in Element.cpp. It used to be unusable during full page zoom because the rounding errors would add up to quite a bit. They've thrown a bunch of JS code at it that detects the zoom level and guesses at what the rounding error will be. It mostly works now, but it's unfortunate, it's fragile and this surely affects other sites. Firefox doesn't have this problem because use decimal values both interally and exposed to JS. Should we do the same? That's a super scary change, but it's the only way I can think of making full-page zoom actually work. Test case attached. 232045 1 57400 ojan 2010-05-28 18:33:11 -0700 Created attachment 57400 test case 737185 2 eae 2012-10-08 16:14:57 -0700 This has been fixed by subpixel layout and works as expected on ports that enable the SUBPIXEL_LAYOUT flag. Marking as fixed. Bug 85532 tracks the ports that have turned on the flag. 57400 2010-05-28 18:33:11 -0700 2010-05-28 18:33:11 -0700 test case scratch.html text/html 378 ojan PHN0eWxlPgpodG1sIHsKICAgIHpvb206IDE1MCU7Cn0KYm9keSA+IGRpdiB7CiAgICBwb3NpdGlv bjphYnNvbHV0ZTsKICAgIHRvcDoyZW07CiAgICBsZWZ0OjA7CiAgICB3aWR0aDoyMDBweDsKfQo8 L3N0eWxlPgoKVGhlcmUgc2hvdWxkIGJlIGEgc29saWQgZ3JlZW4gYm94IGJlbG93LiBObyByZWQu CjxkaXYgc3R5bGU9ImJhY2tncm91bmQtY29sb3I6cmVkO2hlaWdodDoxNTBweDsiPjwvZGl2Pgo8 ZGl2IHN0eWxlPSJiYWNrZ3JvdW5kLWNvbG9yOmdyZWVuIj4KPHNjcmlwdD4KZm9yICh2YXIgaSA9 IDA7IGkgPCAxMDsgaSsrKSB7CiAgICBkb2N1bWVudC53cml0ZSgnPGRpdiBzdHlsZT0iaGVpZ2h0 OjE1cHgiPjwvZGl2PicpOwp9Cjwvc2NyaXB0Pgo8L2Rpdj4K