1687208 - Slow animation on https://www.apple.com/ca/iphone-se/

Status: NEW

(Core :: Graphics: Canvas2D, defect, P3)

Description

[Markus Stange [:mstange]]

Profile: https://share.firefox.dev/3bVVa3g

When scrolling down on https://www.apple.com/ca/iphone-se/ below the "Smile, you're in portrait mode", there is a scrolling stage during which a vector graphic of a 3d cube is slowly scaled to fill the entire screen, while another picture is scaled down slightly.

The vector upscaling is implemented as a drawImage of an SVG image on a 2d canvas. At this size, 2d software canvas does not do a very good job.

Comment 1

[Bas Schouten (:bas.schouten)]

This is slow on Windows with HWA as well.

https://share.firefox.dev/2OuMvLL

Comment 2

[Markus Stange [:mstange]]

So we must be doing something bad then, maybe we're doing work in intermediate buffers that are too large. If we fix that, then the software canvas performance should also improve.