Bug 242847

Summary: iOS 16 beta3 , canvas is blurry in some case.
Product: WebKit Reporter: acery <acery.ycy>
Component: CanvasAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: baba, damir.veapi+webkit, dino, mattwoodrow, simon.fraser, tanaka.toshiyuki, webkit-bug-importer
Priority: P1 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=241450
Attachments:
Description Flags
screenshot
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Testcase none

acery
Reported 2022-07-17 17:58:01 PDT
Created attachment 460966 [details] screenshot We found that canvas of the same size is more blurry in iOS 16 Beta 3. Here's the code: ``` <!DOCTYPE html> <html lang="en"> <head> <title>Document</title> <style> #app { height: 586px; width: 1170px; } </style> </head> <body> <canvas height="586px" width="1170px" id="app"></canvas> <script> const el = document.getElementById('app'); const ctx = el.getContext('2d'); ctx.font = '80px Arial'; ctx.fillText('Hello World', 100, 100) </script> </body> </html> ``` Oddly enough, if you set the height of the code above to 585 px(one pixel less), the text on the canvas becomes clear. This will only happen with iOS Beta 3.
Attachments
screenshot (200.12 KB, image/png)
2022-07-17 17:58 PDT, acery 		no flags
Details
Testcase (416 bytes, text/html)
2022-07-20 14:17 PDT, Simon Fraser (smfr) 		no flags
Details
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Radar WebKit Bug Importer
Comment 1 2022-07-18 16:21:12 PDT
<rdar://problem/97226180>
acery
Comment 2 2022-07-19 20:38:24 PDT
It's urgent. I hope your team can follow up as soon as possible.
Simon Fraser (smfr)
Comment 3 2022-07-20 14:17:00 PDT
Created attachment 461051 [details] Testcase
Damir
Comment 4 2022-11-29 06:13:59 PST
We have a similar issue here. Setting the canvas to `display: none` and then restoring it to `display: block` makes it sharp.
Matt Woodrow
Comment 5 2022-11-29 14:47:47 PST
This got fixed by bug 241450. *** This bug has been marked as a duplicate of bug 241450 ***
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