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Issue metadata

Status: Available
Owner: ----
Cc:
Components:
EstimatedDays: ----
NextAction: 2018-11-30
OS: Windows
Pri: 2
Type: Bug



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1 pixel offset error in small canvas elements

Reported by dwer...@riskamp.com, Oct 26

Issue description

UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0

Steps to reproduce the problem:
1. Create a small canvas (e.g. 600px x 24px)
2. Assign background color (style)
3. Fill canvas with color

What is the expected behavior?
canvas completely obscures background

What went wrong?
1 pixel wide strip of background shows through

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 70.0.3538.77  Channel: stable
OS Version: 10.0
Flash Version: 

Example: https://jsbin.com/kolitoxede/1/edit?output

- The specific example is 600px x 24px. Various sizes exhibit the same issue, but it's not simply the size of the canvas -- for example it appears at 600 x 26px, but not 600 x 25px.

- This does not happen on high-dpi displays
 
Labels: Needs-Triage-M70
Cc: fs...@chromium.org
Labels: Needs-Feedback
NextAction: 2018-11-12
I can't repro this. Try to repro this in incognito mode without any extensions, please.

And if it stills repro, please attach a screenshot.
And the result of your chrome://gpu

thanks.

See attached screenshot and chrome://gpu output.

screenshot.png
58.9 KB View Download
chrome_gpu.txt
16.4 KB View Download
Project Member

Comment 4 by sheriffbot@chromium.org, Oct 29

Labels: -Needs-Feedback
Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
Components: -Blink>Canvas Blink>Paint
Status: Untriaged (was: Unconfirmed)
Owner: schenney@chromium.org
Status: Assigned (was: Untriaged)
I need to look at the sizes of the elements.
The NextAction date has arrived: 2018-11-12
NextAction: 2018-11-30
Owner: ----
Status: Available (was: Assigned)
Making available because I can't look at it soon.
The NextAction date has arrived: 2018-11-30

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