1701533 - Full page screenshot of zoomed page creates picture of incorrect size

Status: RESOLVED DUPLICATE of bug 1699410

(Core :: Web Painting, defect)

Description

[7cf148fd]

Attachment: Screen Shot 2021-03-29 at 8.30.08 AM.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

Open browser on any web page (Windows or Mac is the same)

1. Zoom in or out of a web page (say, zoom out to 50%)
2. Use the screenshot functionality to take a full-page (important) screen shot

Actual results:

The saved picture has an incorrect size (already visible on preview).
A transparent border is added on the right-hand and bottom sides, equals to 1/Xth of the zoom level:

• if the zoom level was 50%, the picture is 1/0.5 = 2x the width and 2x the height
• if the zoom level was 67%, the picture is 1/0.67 = 1.5x the width and 1.5x the height
• if the zoom level was 200%, the picture is 1/0.5 = 0.5x the width and 0.5x the height

Expected results:

The screenshot shouldn't have that transparent margin.

Comment 1

[7cf148fd]

Please note that I submitted the bug using a different browser but I observed the bug with v87, which is the latest as of the submission of this bug.

Comment 2

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Core::Graphics: WebRender' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 3

[Timothy Nikkel (:tnikkel)]

Not sure if the bug is in the web painting code or in the js code that implements the screenshot functionality.

Comment 4

[Emma Malysz]

Thanks for reporting! The work for this is being completed in Bug 1699410.