{"action":"created","issue":{"url":"https://api.github.com/repos/servo/servo/issues/12543","repository_url":"https://api.github.com/repos/servo/servo","labels_url":"https://api.github.com/repos/servo/servo/issues/12543/labels{/name}","comments_url":"https://api.github.com/repos/servo/servo/issues/12543/comments","events_url":"https://api.github.com/repos/servo/servo/issues/12543/events","html_url":"https://github.com/servo/servo/pull/12543","id":166836781,"number":12543,"title":"Accumulate subpixels through stacking contexts","user":{"login":"mrobinson","id":13536,"avatar_url":"https://avatars.githubusercontent.com/u/13536?v=3","gravatar_id":"","url":"https://api.github.com/users/mrobinson","html_url":"https://github.com/mrobinson","followers_url":"https://api.github.com/users/mrobinson/followers","following_url":"https://api.github.com/users/mrobinson/following{/other_user}","gists_url":"https://api.github.com/users/mrobinson/gists{/gist_id}","starred_url":"https://api.github.com/users/mrobinson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mrobinson/subscriptions","organizations_url":"https://api.github.com/users/mrobinson/orgs","repos_url":"https://api.github.com/users/mrobinson/repos","events_url":"https://api.github.com/users/mrobinson/events{/privacy}","received_events_url":"https://api.github.com/users/mrobinson/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/servo/servo/labels/S-awaiting-merge","name":"S-awaiting-merge","color":"d4c5f9"}],"state":"open","locked":false,"assignee":{"login":"pcwalton","id":157897,"avatar_url":"https://avatars.githubusercontent.com/u/157897?v=3","gravatar_id":"","url":"https://api.github.com/users/pcwalton","html_url":"https://github.com/pcwalton","followers_url":"https://api.github.com/users/pcwalton/followers","following_url":"https://api.github.com/users/pcwalton/following{/other_user}","gists_url":"https://api.github.com/users/pcwalton/gists{/gist_id}","starred_url":"https://api.github.com/users/pcwalton/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pcwalton/subscriptions","organizations_url":"https://api.github.com/users/pcwalton/orgs","repos_url":"https://api.github.com/users/pcwalton/repos","events_url":"https://api.github.com/users/pcwalton/events{/privacy}","received_events_url":"https://api.github.com/users/pcwalton/received_events","type":"User","site_admin":false},"assignees":[{"login":"pcwalton","id":157897,"avatar_url":"https://avatars.githubusercontent.com/u/157897?v=3","gravatar_id":"","url":"https://api.github.com/users/pcwalton","html_url":"https://github.com/pcwalton","followers_url":"https://api.github.com/users/pcwalton/followers","following_url":"https://api.github.com/users/pcwalton/following{/other_user}","gists_url":"https://api.github.com/users/pcwalton/gists{/gist_id}","starred_url":"https://api.github.com/users/pcwalton/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pcwalton/subscriptions","organizations_url":"https://api.github.com/users/pcwalton/orgs","repos_url":"https://api.github.com/users/pcwalton/repos","events_url":"https://api.github.com/users/pcwalton/events{/privacy}","received_events_url":"https://api.github.com/users/pcwalton/received_events","type":"User","site_admin":false}],"milestone":null,"comments":6,"created_at":"2016-07-21T14:42:51Z","updated_at":"2016-07-26T03:17:43Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/servo/servo/pulls/12543","html_url":"https://github.com/servo/servo/pull/12543","diff_url":"https://github.com/servo/servo/pull/12543.diff","patch_url":"https://github.com/servo/servo/pull/12543.patch"},"body":"<!-- Please describe your changes on the following line: -->\r\n\r\n---\r\n<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->\r\n- [X] `./mach build -d` does not report any errors\r\n- [X] `./mach test-tidy` does not report any errors\r\n- [ ] These changes fix #__ (github issue number if applicable).\r\n\r\n<!-- Either: -->\r\n- [X] There are tests for these changes OR\r\n- [ ] These changes do not require tests because _____\r\n\r\n<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->\r\n\r\nInstead of simply rounding layer origins and discarding subpixel\r\noffsets, accumulate them by transforming them into the space of the\r\nnext child stacking context. This is an attempt to eliminate subpixel\r\ndifferences that are caused by different stacking context boundaries in\r\nreference tests.\r\n\r\nCurrently these accumulated subpixels are only used for text\r\npositioning, but the plan is that they can be used for all drawing in\r\nthe future.\n\n<!-- Reviewable:start -->\n---\nThis change is [<img src=\"https://reviewable.io/review_button.svg\" height=\"34\" align=\"absmiddle\" alt=\"Reviewable\"/>](https://reviewable.io/reviews/servo/servo/12543)\n<!-- Reviewable:end -->\n"},"comment":{"url":"https://api.github.com/repos/servo/servo/issues/comments/235151736","html_url":"https://github.com/servo/servo/pull/12543#issuecomment-235151736","issue_url":"https://api.github.com/repos/servo/servo/issues/12543","id":235151736,"user":{"login":"bors-servo","id":4368172,"avatar_url":"https://avatars.githubusercontent.com/u/4368172?v=3","gravatar_id":"","url":"https://api.github.com/users/bors-servo","html_url":"https://github.com/bors-servo","followers_url":"https://api.github.com/users/bors-servo/followers","following_url":"https://api.github.com/users/bors-servo/following{/other_user}","gists_url":"https://api.github.com/users/bors-servo/gists{/gist_id}","starred_url":"https://api.github.com/users/bors-servo/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bors-servo/subscriptions","organizations_url":"https://api.github.com/users/bors-servo/orgs","repos_url":"https://api.github.com/users/bors-servo/repos","events_url":"https://api.github.com/users/bors-servo/events{/privacy}","received_events_url":"https://api.github.com/users/bors-servo/received_events","type":"User","site_admin":false},"created_at":"2016-07-26T03:17:43Z","updated_at":"2016-07-26T03:17:43Z","body":":broken_heart: Test failed - [mac-rel-css](http://build.servo.org/builders/mac-rel-css/builds/2214)"}}
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