1902012 - Disable hardware acceleration in pdf.js

Status: RESOLVED FIXED

(Firefox :: PDF Viewer, defect, P1)

Description

[Calixte Denizet (:calixte)]

It should improve performances and avoid some bad rendering issues.

Comment 1

[BMO Github Automation]

Attachment: [mozilla/pdf.js] Add an option to enable/disable hardware acceleration (bug 1902012) (#18238)

Comment 2

[mirh]

How can disabling acceleration, actually improve performance? Aside of bugs, that is.

Comment 3

[Marco Castelluccio [:marco]]

(In reply to mirh from comment #2)

How can disabling acceleration, actually improve performance? Aside of bugs, that is.

Hardware acceleration doesn't always help, it depends on the characteristics of the workload.
E.g. in the case of pdf.js, we often need to read back the pixels we draw. If we draw them with the GPU on the GPU, we need to read back the memory from the GPU, and this is very costly. If we draw them with the CPU on the CPU memory, reading is very cheap.