[api-minor] Fix issues in text selection #13424

calixteman · 2021-05-23T17:16:50Z

PR [api-minor] Fix the way to chunk the strings #13257 fixed a lot of issues but not all and this patch aims to fix almost all remaining issues.
the idea in this new patch is to compare position of new glyph with the last position where a glyph has been drawn;
- no space are "drawn": it just moves the cursor but they aren't added in the chunk;
- so this way a space followed by a cursor move can be treated as only one space: it helps to merge all spaces into one.
to make difference between real spaces and tracking ones, we used a factor of the space width (from the font)
- it was a pretty good idea in general but it fails with some fonts where space was too big:
- in Poppler, they're using a factor of the font size: this is an excellent idea (<= 0.1 * fontSize implies tracking space).

Fixes #6705
Fixes #7833
Fixes #9247
Fixes #9998
Fixes #10448
Fixes #10640
Fixes #10900
Fixes #11913
Fixes #13201
Fixes #13226

test/test_manifest.json

test/unit/api_spec.js

timvandermeij · 2021-05-25T19:12:10Z

/botio test

pdfjsbot · 2021-05-25T19:12:11Z

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pdfjsbot · 2021-05-25T19:12:11Z

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pdfjsbot · 2021-05-25T19:38:02Z

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Full output at http://54.67.70.0:8877/ba7e5367fe2761d/output.txt

Total script time: 25.83 mins

Font tests: Passed
Unit tests: Passed
Integration Tests: Passed
Regression tests: FAILED

Image differences available at: http://54.67.70.0:8877/ba7e5367fe2761d/reftest-analyzer.html#web=eq.log

pdfjsbot · 2021-05-25T19:45:10Z

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Full output at http://3.101.106.178:8877/ff49f0a56667729/output.txt

Total script time: 30.32 mins

Font tests: Passed
Unit tests: Passed
Integration Tests: Passed
Regression tests: FAILED

Image differences available at: http://3.101.106.178:8877/ff49f0a56667729/reftest-analyzer.html#web=eq.log

Snuffleupagus

Unfortunately this patch causes rendering regressions in eq-tests, and those tests should definitely not be changing for a text-selection only patch (see a possibly incomplete list below). My guess is that the src/core/fonts.js changes are not generally appropriate and/or correct here.

bug921760
issue9949
issue6127
font_ascent_descent (slight movement)
issue6737 (slight movement)

There's also some text-tests which looks slightly worse than before, some examples include:

tracemonkey-text-page14
issue11713
issue6019
issue5972
issue3925

src/core/fonts.js

calixteman · 2021-05-29T18:17:00Z

Unfortunately this patch causes rendering regressions in eq-tests, and those tests should definitely not be changing for a text-selection only patch (see a possibly incomplete list below). My guess is that the src/core/fonts.js changes are not generally appropriate and/or correct here.
* bug921760

* issue9949

* issue6127

* font_ascent_descent (slight movement)

* issue6737 (slight movement)

They should be fixed now (I reverted changes in fonts.js).

There's also some text-tests which looks slightly worse than before, some examples include:
* tracemonkey-text-page14

There's slightly less spans so it implies a shift between canvas and text layer.

* issue11713

There no font change between sigmas but scale factor changes so chunks are not flushed and glyphes with different scale factor can be merged.

* issue6019

I handled this in using the rotation angle from document: it's ok now.

* issue5972

I'm not sure to know if it's worth or better.
Anyway some chunks are flushed because of https://github.com/mozilla/pdf.js/pull/13424/files#diff-cf40014d9c7d352f3ae212e7fffe5386decf96a10e53066a4d900c3eb8fc559eR2339.
We can change the factor in HALF_LAST_CHAR (and the name too) to have all the chars in the same chunk, what do you think ?

* issue3925

I fixed the big space things but some shift are due to less spans.

src/core/fonts.js

src/core/evaluator.js

calixteman · 2021-10-03T15:03:51Z

/botio test

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pdfjsbot · 2021-10-03T15:03:52Z

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pdfjsbot · 2021-10-03T15:26:14Z

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Full output at http://54.241.84.105:8877/94d0bf5ff830e90/output.txt

Total script time: 22.36 mins

Font tests: Passed
Unit tests: Passed
Integration Tests: FAILED
Regression tests: FAILED

  different ref/snapshot: 112
  different first/second rendering: 1

Image differences available at: http://54.241.84.105:8877/94d0bf5ff830e90/reftest-analyzer.html#web=eq.log

pdfjsbot · 2021-10-03T15:45:05Z

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Full output at http://54.193.163.58:8877/74a22de94fb2026/output.txt

Total script time: 41.21 mins

Font tests: Passed
Unit tests: Passed
Integration Tests: FAILED
Regression tests: FAILED

  different ref/snapshot: 105
  different first/second rendering: 1

Image differences available at: http://54.193.163.58:8877/74a22de94fb2026/reftest-analyzer.html#web=eq.log

Snuffleupagus

Looking at the test results, I do believe that there's too much movement (and some outright regressions) in existing test-cases. The following is a non-exhaustive list (focusing on Firefox), so please go through the test results and see what can be done to improve (some of) these cases:

tracemonkey-text-page1, one case of worse agreement between the canvas/textLayer.
issue3925-page1, many cases of disagreement between the canvas/textLayer.
taro-text-page1..4, worse agreement between the canvas/textLayer for the vertical text.
issue11713-page1, the sizing looks off for the last glyph.
issue1127-text-page1, there's both improvements and regressions,
issue4684-text-page1, lots of separate spaces being inserted.
issue5896-text-page1, another possible issue with space handling (based on the reference images).
mao-text-page1, slightly worse agreement between the canvas/textLayer in places.
issue6605-page1, all spaces seem to be missing in the textLayer (causing bad alignment).

src/core/fonts.js

src/core/evaluator.js

Snuffleupagus

I'm honestly not really sure what to make of the test results, since regardless of the MAX_FACTOR value there's going to be some regressions.
/cc @brendandahl What's your opinion here, what sort of movement (in existing test-cases) are we willing to trade for a handful of fixed issues?

src/display/text_layer.js

brendandahl · 2021-10-14T02:29:26Z

Calixte mentioned .5 seemed to be the best compromise, so I looked through those ones. As mentioned above there are few regressions but there also some improvements (issue6019-text-page1, taro-text-page1). IIRC the PDF in issue3925-page1 is a really weird one, so I'm not too worried about regressing it.

One I'm a bit concerned about is mao-text-page1, we have very few CJK text layer tests. Is there something we should do differently for CJK fonts?

If we can fix mao, I'd be fine with taking a few minor regressions for all the copy/paste bugs this fixes.

- PR mozilla#13257 fixed a lot of issues but not all and this patch aims to fix almost all remaining issues. - the idea in this new patch is to compare position of new glyph with the last position where a glyph has been drawn; - no space are "drawn": it just moves the cursor but they aren't added in the chunk; - so this way a space followed by a cursor move can be treated as only one space: it helps to merge all spaces into one. - to make difference between real spaces and tracking ones, we used a factor of the space width (from the font) - it was a pretty good idea in general but it fails with some fonts where space was too big: - in Poppler, they're using a factor of the font size: this is an excellent idea (<= 0.1 * fontSize implies tracking space).

calixteman · 2021-10-17T14:28:26Z

I set the MAX_FACTOR to 0.6 and fixed few issues in mao test.
/botio test

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pdfjsbot · 2021-10-17T14:28:27Z

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pdfjsbot · 2021-10-17T14:48:59Z

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Full output at http://54.241.84.105:8877/6b6d60f532e2ded/output.txt

Total script time: 20.51 mins

Font tests: Passed
Unit tests: Passed
Integration Tests: Passed
Regression tests: FAILED

  errors: 654
  different ref/snapshot: 90

Image differences available at: http://54.241.84.105:8877/6b6d60f532e2ded/reftest-analyzer.html#web=eq.log

calixteman · 2021-10-17T14:49:38Z

/botio-linux test

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pdfjsbot · 2021-10-17T15:09:21Z

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Full output at http://54.193.163.58:8877/d0283e3b1279d8d/output.txt

Total script time: 40.88 mins

Font tests: Passed
Unit tests: Passed
Integration Tests: Passed
Regression tests: FAILED

  different ref/snapshot: 114
  different first/second rendering: 1

Image differences available at: http://54.193.163.58:8877/d0283e3b1279d8d/reftest-analyzer.html#web=eq.log

pdfjsbot · 2021-10-17T15:12:12Z

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Full output at http://54.241.84.105:8877/fb791b216583a90/output.txt

Total script time: 22.53 mins

Font tests: Passed
Unit tests: Passed
Integration Tests: Passed
Regression tests: FAILED

  different ref/snapshot: 112

Image differences available at: http://54.241.84.105:8877/fb791b216583a90/reftest-analyzer.html#web=eq.log

Snuffleupagus · 2021-10-18T07:29:06Z

/botio-linux preview

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pdfjsbot · 2021-10-18T07:33:35Z

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Full output at http://54.241.84.105:8877/2c304410c0dd850/output.txt

Total script time: 4.44 mins

Published

Viewer: http://54.241.84.105:8877/2c304410c0dd850/web/viewer.html
Viewer (legacy): http://54.241.84.105:8877/2c304410c0dd850/legacy/web/viewer.html

calixteman · 2021-10-18T13:14:29Z

/botio makeref

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pdfjsbot · 2021-10-18T13:14:31Z

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pdfjsbot · 2021-10-18T13:34:53Z

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Full output at http://54.241.84.105:8877/1e5d6828893ccdb/output.txt

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Lint: Passed
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Check references: Passed

pdfjsbot · 2021-10-18T13:57:55Z

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Total script time: 38.20 mins

Lint: Passed
Make references: Passed
Check references: Passed

calixteman requested review from timvandermeij and brendandahl May 23, 2021 17:17

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This was referenced Oct 21, 2021

PDF viewer showing/copying double spaces instead of single #9083

Closed

TextLayer not well aligned for Amharic fonts extracted from this PDF #11756

Closed

This was referenced Oct 31, 2021

Arabic characters in text-layer are not correct #9523

Closed

Add a RTL-text reference test (issue 10301) #14212

Merged

marco-c added this to Closed in PDF.js quality Feb 24, 2022

Snuffleupagus mentioned this pull request May 11, 2024

Remove the unused Font.prototype.spaceWidth getter (PR 13424 follow-up) #18069

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[api-minor] Fix issues in text selection #13424

[api-minor] Fix issues in text selection #13424

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[api-minor] Fix issues in text selection #13424

[api-minor] Fix issues in text selection #13424

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