{"action":"created","issue":{"url":"https://api.github.com/repos/servo/webrender/issues/3018","repository_url":"https://api.github.com/repos/servo/webrender","labels_url":"https://api.github.com/repos/servo/webrender/issues/3018/labels{/name}","comments_url":"https://api.github.com/repos/servo/webrender/issues/3018/comments","events_url":"https://api.github.com/repos/servo/webrender/issues/3018/events","html_url":"https://github.com/servo/webrender/issues/3018","id":357068537,"node_id":"MDU6SXNzdWUzNTcwNjg1Mzc=","number":3018,"title":"Google Maps overdraws a lot due to canvas context not being marked opaque","user":{"login":"pcwalton","id":157897,"node_id":"MDQ6VXNlcjE1Nzg5Nw==","avatar_url":"https://avatars0.githubusercontent.com/u/157897?v=4","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},"labels":[{"id":668593863,"node_id":"MDU6TGFiZWw2Njg1OTM4NjM=","url":"https://api.github.com/repos/servo/webrender/labels/area:%20performance","name":"area: performance","color":"bfd4f2","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":6,"created_at":"2018-09-05T05:14:29Z","updated_at":"2018-09-06T14:13:38Z","closed_at":null,"author_association":"COLLABORATOR","body":"Maybe we should try to autodetect the case in which the canvas context is opaque to avoid overdraw."},"comment":{"url":"https://api.github.com/repos/servo/webrender/issues/comments/419108843","html_url":"https://github.com/servo/webrender/issues/3018#issuecomment-419108843","issue_url":"https://api.github.com/repos/servo/webrender/issues/3018","id":419108843,"node_id":"MDEyOklzc3VlQ29tbWVudDQxOTEwODg0Mw==","user":{"login":"nical","id":264854,"node_id":"MDQ6VXNlcjI2NDg1NA==","avatar_url":"https://avatars2.githubusercontent.com/u/264854?v=4","gravatar_id":"","url":"https://api.github.com/users/nical","html_url":"https://github.com/nical","followers_url":"https://api.github.com/users/nical/followers","following_url":"https://api.github.com/users/nical/following{/other_user}","gists_url":"https://api.github.com/users/nical/gists{/gist_id}","starred_url":"https://api.github.com/users/nical/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nical/subscriptions","organizations_url":"https://api.github.com/users/nical/orgs","repos_url":"https://api.github.com/users/nical/repos","events_url":"https://api.github.com/users/nical/events{/privacy}","received_events_url":"https://api.github.com/users/nical/received_events","type":"User","site_admin":false},"created_at":"2018-09-06T14:13:38Z","updated_at":"2018-09-06T14:13:38Z","author_association":"COLLABORATOR","body":"We can detect some of the opaque cases in gecko's canvas implementation the same way we try to detect when the first drawing command clobbers all pixels to skip the copy-on-write.\r\nIf possible I'd prefer to avoid complicated rendering tricks when compositing the canvas."}}
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