965254 - HiDPI upscaling of 1x images looks worse than in Safari

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Markus Stange [:mstange]]

Attachment: comparison

This bug was originally reported in bug 957660.

STR:
1. Go to http://www.mozilla.org/en-US/ in Firefox and Safari on a retina Mac.
2. Look at the red thread in the background image behind "Learn the web".

This image does not have a 2x resolution, it gets scaled up by the browser.

The scaled image looks better in Safari than in Firefox. The differences are especially apparent in the curved parts of the red line.

Comment 1

[Jeff Muizelaar [:jrmuizel]]

The difference in quality seems to come from using Accelerated CoreGraphics. If you "Disable Full Page Accelerated Drawing in New Windows" the quality that you get is the same as Firefox.

Comment 2

[Andreas Gal :gal]

I think we are using NN for background images to avoid slow scaling of really large background images. CNN for example uses a tiny image they scale across the whole page which is super slow. I added a path to scale that on the GPU which uses higher quality scaling. We could try that

Comment 3

[Gregory Pappas [:gregp]]

Are you still able to reproduce?

Comment 4

[Markus Stange [:mstange]]

No, this looks fixed!