960315 - really bad performance on this pdf

Status: RESOLVED FIXED

(Firefox :: PDF Viewer, defect, P4)

Description

[Nick Fitzgerald [:fitzgen] [⏰PST; UTC-8]]

bdahl says that the text layer's algorithm is breaking down and creating a div for every character.

http://www.dwarfstd.org/doc/Debugging%20using%20DWARF.pdf

It's better with "#textLayer=off" in the url, but still not as good as pdfjs usually is.

Comment 1

[Nicholas Nethercote [inactive]]

Yeah, this document mostly consists of moveText/showText pairs, where most of the showText ops display a single glyph. An example:

> showText: [[{"fontChar":"I","unicode":"I","accent":null,"width":389}]]
> moveText: [9.2,0]
> showText: [[{"fontChar":"n","unicode":"n","accent":null,"width":666}]]
> moveText: [15.6,0]
> showText: [[{"fontChar":"t","unicode":"t","accent":null,"width":443}]]
> moveText: [10.5,0]
> showText: [[{"fontChar":"r","unicode":"r","accent":null,"width":443}]]
> moveText: [10.4,0]
> showText: [[{"fontChar":"o","unicode":"o","accent":null,"width":666}]]
> moveText: [15.7,0]
> showText: [[{"fontChar":"d","unicode":"d","accent":null,"width":666}]]
> moveText: [15.7,0]
> showText: [[{"fontChar":"u","unicode":"u","accent":null,"width":666}]]
> moveText: [15.7,0]
> showText: [[{"fontChar":"c","unicode":"c","accent":null,"width":666}]]
> moveText: [15.7,0]
> showText: [[{"fontChar":"t","unicode":"t","accent":null,"width":443}]]
> moveText: [10.4,0]
> showText: [[{"fontChar":"i","unicode":"i","accent":null,"width":333}]]
> moveText: [7.8,0]
> showText: [[{"fontChar":"o","unicode":"o","accent":null,"width":666}]]
> moveText: [15.7,0]
> showText: [[{"fontChar":"n","unicode":"n","accent":null,"width":666}]]
> moveText: [15.7,0]

Comment 2

[Yury Delendik (:yury)]

https://github.com/mozilla/pdf.js/pull/6590 shall address this issue