Use `Path2D`, if available, when rendering Type3-fonts (bug 810214) #14858

Snuffleupagus · 2022-04-30T11:10:18Z

Note that in order to avoid unnecessary allocations we build the Path2D-object inline during parsing, rather than iterating through the complete outlines-Array at the end.

This patch was tested using the PDF file from bug 810214, i.e. https://bug810214.bmoattachments.org/attachment.cgi?id=9254990, with the following manifest file:

[
    {  "id": "bug810214",
       "file": "../web/pdfs/bug810214.pdf",
       "md5": "2b7243178f5dd5fd3edc7b6649e4bdf3",
       "rounds": 100,
       "lastPage": 25,
       "type": "eq"
    }
]

which gave the following results when comparing this patch against the master branch:

Overall

-- Grouped By browser, stat --
browser | stat         | Count | Baseline(ms) | Current(ms) | +/- |     %  | Result(P<.05)
------- | ------------ | ----- | ------------ | ----------- | --- | ------ | -------------
firefox | Overall      |  2500 |          123 |          78 | -44 | -36.25 |        faster
firefox | Page Request |  2500 |            2 |           2 |   0 |   9.11 |        slower
firefox | Rendering    |  2500 |          121 |          76 | -45 | -36.93 |        faster

Page-specific

-- Grouped By browser, page, stat --
browser | page | stat         | Count | Baseline(ms) | Current(ms) | +/- |     %  | Result(P<.05)
------- | ---- | ------------ | ----- | ------------ | ----------- | --- | ------ | -------------
firefox | 0    | Overall      |   100 |           36 |          35 |  -1 |  -2.89 |
firefox | 0    | Page Request |   100 |            2 |           2 |   0 |   7.33 |
firefox | 0    | Rendering    |   100 |           34 |          33 |  -1 |  -3.47 |
firefox | 1    | Overall      |   100 |          123 |          81 | -42 | -33.92 |        faster
firefox | 1    | Page Request |   100 |            2 |           2 |   0 |  -3.31 |
firefox | 1    | Rendering    |   100 |          121 |          79 | -42 | -34.44 |        faster
firefox | 2    | Overall      |   100 |          129 |          82 | -47 | -36.61 |        faster
firefox | 2    | Page Request |   100 |            2 |           2 |   0 |  24.84 |        slower
firefox | 2    | Rendering    |   100 |          127 |          80 | -47 | -37.33 |        faster
firefox | 3    | Overall      |   100 |          114 |          68 | -46 | -40.18 |        faster
firefox | 3    | Page Request |   100 |            2 |           2 |   0 |  15.63 |        slower
firefox | 3    | Rendering    |   100 |          112 |          66 | -46 | -41.07 |        faster
firefox | 4    | Overall      |   100 |          102 |          75 | -27 | -26.09 |        faster
firefox | 4    | Page Request |   100 |            2 |           2 |   0 |   9.62 |
firefox | 4    | Rendering    |   100 |          100 |          73 | -27 | -26.71 |        faster
firefox | 5    | Overall      |   100 |          103 |          77 | -26 | -25.15 |        faster
firefox | 5    | Page Request |   100 |            2 |           2 |   0 |  -6.86 |
firefox | 5    | Rendering    |   100 |          100 |          75 | -26 | -25.53 |        faster
firefox | 6    | Overall      |   100 |           48 |          37 | -11 | -22.56 |        faster
firefox | 6    | Page Request |   100 |            2 |           2 |   0 | -10.14 |
firefox | 6    | Rendering    |   100 |           46 |          35 | -11 | -23.16 |        faster
firefox | 7    | Overall      |   100 |          109 |          70 | -39 | -35.59 |        faster
firefox | 7    | Page Request |   100 |            2 |           2 |   0 |   5.29 |
firefox | 7    | Rendering    |   100 |          107 |          68 | -39 | -36.23 |        faster
firefox | 8    | Overall      |   100 |           39 |          31 |  -9 | -22.14 |        faster
firefox | 8    | Page Request |   100 |            2 |           2 |   0 |   1.72 |
firefox | 8    | Rendering    |   100 |           38 |          29 |  -9 | -23.38 |        faster
firefox | 9    | Overall      |   100 |          156 |          96 | -60 | -38.49 |        faster
firefox | 9    | Page Request |   100 |            1 |           2 |   0 |  13.61 |
firefox | 9    | Rendering    |   100 |          155 |          94 | -60 | -38.98 |        faster
firefox | 10   | Overall      |   100 |          173 |         105 | -68 | -39.20 |        faster
firefox | 10   | Page Request |   100 |            2 |           2 |   0 |  -8.81 |
firefox | 10   | Rendering    |   100 |          171 |         103 | -68 | -39.60 |        faster
firefox | 11   | Overall      |   100 |          152 |          89 | -64 | -41.88 |        faster
firefox | 11   | Page Request |   100 |            2 |           2 |   0 |   6.04 |
firefox | 11   | Rendering    |   100 |          150 |          87 | -64 | -42.47 |        faster
firefox | 12   | Overall      |   100 |          141 |          90 | -51 | -35.91 |        faster
firefox | 12   | Page Request |   100 |            2 |           2 |   0 |  17.37 |
firefox | 12   | Rendering    |   100 |          139 |          88 | -51 | -36.60 |        faster
firefox | 13   | Overall      |   100 |           97 |          61 | -36 | -36.79 |        faster
firefox | 13   | Page Request |   100 |            2 |           2 |   0 |  25.44 |        slower
firefox | 13   | Rendering    |   100 |           95 |          59 | -36 | -37.87 |        faster
firefox | 14   | Overall      |   100 |          118 |          82 | -36 | -30.33 |        faster
firefox | 14   | Page Request |   100 |            2 |           2 |   0 |   9.20 |
firefox | 14   | Rendering    |   100 |          117 |          80 | -36 | -30.95 |        faster
firefox | 15   | Overall      |   100 |          111 |          73 | -37 | -33.85 |        faster
firefox | 15   | Page Request |   100 |            2 |           2 |   0 |  13.25 |
firefox | 15   | Rendering    |   100 |          109 |          71 | -38 | -34.61 |        faster
firefox | 16   | Overall      |   100 |          145 |          88 | -57 | -39.19 |        faster
firefox | 16   | Page Request |   100 |            2 |           2 |   1 |  33.75 |        slower
firefox | 16   | Rendering    |   100 |          143 |          86 | -57 | -40.03 |        faster
firefox | 17   | Overall      |   100 |          171 |         126 | -45 | -26.27 |        faster
firefox | 17   | Page Request |   100 |            2 |           2 |   0 |  17.92 |        slower
firefox | 17   | Rendering    |   100 |          169 |         124 | -45 | -26.69 |        faster
firefox | 18   | Overall      |   100 |          126 |          78 | -47 | -37.71 |        faster
firefox | 18   | Page Request |   100 |            2 |           2 |   0 |   2.43 |
firefox | 18   | Rendering    |   100 |          124 |          76 | -48 | -38.43 |        faster
firefox | 19   | Overall      |   100 |           92 |          58 | -34 | -37.19 |        faster
firefox | 19   | Page Request |   100 |            2 |           2 |   0 |  12.74 |
firefox | 19   | Rendering    |   100 |           90 |          56 | -35 | -38.13 |        faster
firefox | 20   | Overall      |   100 |          178 |          96 | -82 | -46.18 |        faster
firefox | 20   | Page Request |   100 |            2 |           2 |   0 |  -2.23 |
firefox | 20   | Rendering    |   100 |          176 |          94 | -82 | -46.67 |        faster
firefox | 21   | Overall      |   100 |          181 |         102 | -79 | -43.77 |        faster
firefox | 21   | Page Request |   100 |            2 |           2 |   0 |  12.36 |        slower
firefox | 21   | Rendering    |   100 |          179 |          99 | -79 | -44.34 |        faster
firefox | 22   | Overall      |   100 |          140 |          84 | -55 | -39.59 |        faster
firefox | 22   | Page Request |   100 |            2 |           2 |   0 |  12.50 |
firefox | 22   | Rendering    |   100 |          138 |          82 | -55 | -40.25 |        faster
firefox | 23   | Overall      |   100 |          119 |          73 | -46 | -38.48 |        faster
firefox | 23   | Page Request |   100 |            2 |           2 |   1 |  35.71 |        slower
firefox | 23   | Rendering    |   100 |          117 |          71 | -46 | -39.48 |        faster
firefox | 24   | Overall      |   100 |          165 |          96 | -68 | -41.51 |        faster
firefox | 24   | Page Request |   100 |            2 |           2 |   0 |   2.81 |
firefox | 24   | Rendering    |   100 |          163 |          94 | -68 | -42.00 |        faster

Snuffleupagus · 2022-04-30T11:32:52Z

/botio test

pdfjsbot · 2022-04-30T11:32:53Z

From: Bot.io (Linux m4)

Received

Command cmd_test from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/d87055b99a35292/output.txt

pdfjsbot · 2022-04-30T11:32:53Z

From: Bot.io (Windows)

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Command cmd_test from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/d46f50bbf0624e0/output.txt

calixteman · 2022-04-30T11:40:43Z

Would it be possible to build the paths in the worker ? would it be useful to do that if possible ?

pdfjsbot · 2022-04-30T11:58:58Z

From: Bot.io (Linux m4)

Failed

Full output at http://54.241.84.105:8877/d87055b99a35292/output.txt

Total script time: 26.07 mins

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

  different ref/snapshot: 7
  different first/second rendering: 1

Image differences available at: http://54.241.84.105:8877/d87055b99a35292/reftest-analyzer.html#web=eq.log

pdfjsbot · 2022-04-30T11:59:30Z

From: Bot.io (Windows)

Failed

Full output at http://54.193.163.58:8877/d46f50bbf0624e0/output.txt

Total script time: 26.60 mins

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

  different ref/snapshot: 1

Image differences available at: http://54.193.163.58:8877/d46f50bbf0624e0/reftest-analyzer.html#web=eq.log

Snuffleupagus · 2022-04-30T12:19:43Z

Would it be possible to build the paths in the worker ?

Well, it doesn't actually seem possible to send a Path2D-object via postMessage according to some quick tests (it's not supported by the structured cloning algorithm as far as I can tell). Hence it seems like the answer is NO, and looking at all of the Type3-code in canvas.js it probably wouldn't have been exactly trivial anyway.

would it be useful to do that if possible ?

I'm actually not so sure if would've helped much, had it worked, considering that:

Type3-fonts are, thankfully, not all that common in PDF documents. It seems that we're no longer collecting the relevant Telemetry-data, since the most recent data I could find is a bit old.
Type3-fonts are already, thanks to the pre-existing compiling and caching on first use, rendered fairly quickly.
With this patch, the rendering time in real world test-cases is reduced even further.

src/display/canvas.js

src/shared/util.js

timvandermeij · 2022-04-30T17:26:30Z

Out of curiosity, what makes Path2D so much faster here? AFAICT in the previous code we populated an array and looped over that at the end to perform the drawing instructions, while we now make a Path2D object where we do the same operations on so it seems. Is it purely the prevention of the array creation/loop that saves so much, or is the fact that all drawing instructions are now being performed on the canvas object in one go instead of individually, or is Path2D doing something else more efficiently?

Snuffleupagus · 2022-04-30T20:14:50Z

Is it purely the prevention of the array creation/loop that saves so much,

While I obviously don't know, this is likely more-or-less completely unrelated to the performance improvements.

or is the fact that all drawing instructions are now being performed on the canvas object in one go instead of individually,

That'd rather be the most likely explanation, as far as I understand things.
In the old code we'd apply lots of moveTo/lineTo operators individually during rendering, whereas with Path2D all those instructions are applied at once instead (and thus allowing the browser to optimize things a fair bit). Also, everytime that we render one specific Type3-glyph we're now also using the same identical Path2D-object.

src/display/canvas.js

Note that in order to avoid unnecessary allocations we build the `Path2D`-object *inline* during parsing, rather than iterating through the complete `outlines`-Array at the end. This patch was tested using the PDF file from bug 810214, i.e. https://bug810214.bmoattachments.org/attachment.cgi?id=9254990, with the following manifest file: ``` [ { "id": "bug810214", "file": "../web/pdfs/bug810214.pdf", "md5": "2b7243178f5dd5fd3edc7b6649e4bdf3", "rounds": 100, "lastPage": 25, "type": "eq" } ] ``` which gave the following results when comparing this patch against the `master` branch: - Overall ``` -- Grouped By browser, stat -- browser | stat | Count | Baseline(ms) | Current(ms) | +/- | % | Result(P<.05) ------- | ------------ | ----- | ------------ | ----------- | --- | ------ | ------------- firefox | Overall | 2500 | 123 | 78 | -44 | -36.25 | faster firefox | Page Request | 2500 | 2 | 2 | 0 | 9.11 | slower firefox | Rendering | 2500 | 121 | 76 | -45 | -36.93 | faster ``` - Page-specific ``` -- Grouped By browser, page, stat -- browser | page | stat | Count | Baseline(ms) | Current(ms) | +/- | % | Result(P<.05) ------- | ---- | ------------ | ----- | ------------ | ----------- | --- | ------ | ------------- firefox | 0 | Overall | 100 | 36 | 35 | -1 | -2.89 | firefox | 0 | Page Request | 100 | 2 | 2 | 0 | 7.33 | firefox | 0 | Rendering | 100 | 34 | 33 | -1 | -3.47 | firefox | 1 | Overall | 100 | 123 | 81 | -42 | -33.92 | faster firefox | 1 | Page Request | 100 | 2 | 2 | 0 | -3.31 | firefox | 1 | Rendering | 100 | 121 | 79 | -42 | -34.44 | faster firefox | 2 | Overall | 100 | 129 | 82 | -47 | -36.61 | faster firefox | 2 | Page Request | 100 | 2 | 2 | 0 | 24.84 | slower firefox | 2 | Rendering | 100 | 127 | 80 | -47 | -37.33 | faster firefox | 3 | Overall | 100 | 114 | 68 | -46 | -40.18 | faster firefox | 3 | Page Request | 100 | 2 | 2 | 0 | 15.63 | slower firefox | 3 | Rendering | 100 | 112 | 66 | -46 | -41.07 | faster firefox | 4 | Overall | 100 | 102 | 75 | -27 | -26.09 | faster firefox | 4 | Page Request | 100 | 2 | 2 | 0 | 9.62 | firefox | 4 | Rendering | 100 | 100 | 73 | -27 | -26.71 | faster firefox | 5 | Overall | 100 | 103 | 77 | -26 | -25.15 | faster firefox | 5 | Page Request | 100 | 2 | 2 | 0 | -6.86 | firefox | 5 | Rendering | 100 | 100 | 75 | -26 | -25.53 | faster firefox | 6 | Overall | 100 | 48 | 37 | -11 | -22.56 | faster firefox | 6 | Page Request | 100 | 2 | 2 | 0 | -10.14 | firefox | 6 | Rendering | 100 | 46 | 35 | -11 | -23.16 | faster firefox | 7 | Overall | 100 | 109 | 70 | -39 | -35.59 | faster firefox | 7 | Page Request | 100 | 2 | 2 | 0 | 5.29 | firefox | 7 | Rendering | 100 | 107 | 68 | -39 | -36.23 | faster firefox | 8 | Overall | 100 | 39 | 31 | -9 | -22.14 | faster firefox | 8 | Page Request | 100 | 2 | 2 | 0 | 1.72 | firefox | 8 | Rendering | 100 | 38 | 29 | -9 | -23.38 | faster firefox | 9 | Overall | 100 | 156 | 96 | -60 | -38.49 | faster firefox | 9 | Page Request | 100 | 1 | 2 | 0 | 13.61 | firefox | 9 | Rendering | 100 | 155 | 94 | -60 | -38.98 | faster firefox | 10 | Overall | 100 | 173 | 105 | -68 | -39.20 | faster firefox | 10 | Page Request | 100 | 2 | 2 | 0 | -8.81 | firefox | 10 | Rendering | 100 | 171 | 103 | -68 | -39.60 | faster firefox | 11 | Overall | 100 | 152 | 89 | -64 | -41.88 | faster firefox | 11 | Page Request | 100 | 2 | 2 | 0 | 6.04 | firefox | 11 | Rendering | 100 | 150 | 87 | -64 | -42.47 | faster firefox | 12 | Overall | 100 | 141 | 90 | -51 | -35.91 | faster firefox | 12 | Page Request | 100 | 2 | 2 | 0 | 17.37 | firefox | 12 | Rendering | 100 | 139 | 88 | -51 | -36.60 | faster firefox | 13 | Overall | 100 | 97 | 61 | -36 | -36.79 | faster firefox | 13 | Page Request | 100 | 2 | 2 | 0 | 25.44 | slower firefox | 13 | Rendering | 100 | 95 | 59 | -36 | -37.87 | faster firefox | 14 | Overall | 100 | 118 | 82 | -36 | -30.33 | faster firefox | 14 | Page Request | 100 | 2 | 2 | 0 | 9.20 | firefox | 14 | Rendering | 100 | 117 | 80 | -36 | -30.95 | faster firefox | 15 | Overall | 100 | 111 | 73 | -37 | -33.85 | faster firefox | 15 | Page Request | 100 | 2 | 2 | 0 | 13.25 | firefox | 15 | Rendering | 100 | 109 | 71 | -38 | -34.61 | faster firefox | 16 | Overall | 100 | 145 | 88 | -57 | -39.19 | faster firefox | 16 | Page Request | 100 | 2 | 2 | 1 | 33.75 | slower firefox | 16 | Rendering | 100 | 143 | 86 | -57 | -40.03 | faster firefox | 17 | Overall | 100 | 171 | 126 | -45 | -26.27 | faster firefox | 17 | Page Request | 100 | 2 | 2 | 0 | 17.92 | slower firefox | 17 | Rendering | 100 | 169 | 124 | -45 | -26.69 | faster firefox | 18 | Overall | 100 | 126 | 78 | -47 | -37.71 | faster firefox | 18 | Page Request | 100 | 2 | 2 | 0 | 2.43 | firefox | 18 | Rendering | 100 | 124 | 76 | -48 | -38.43 | faster firefox | 19 | Overall | 100 | 92 | 58 | -34 | -37.19 | faster firefox | 19 | Page Request | 100 | 2 | 2 | 0 | 12.74 | firefox | 19 | Rendering | 100 | 90 | 56 | -35 | -38.13 | faster firefox | 20 | Overall | 100 | 178 | 96 | -82 | -46.18 | faster firefox | 20 | Page Request | 100 | 2 | 2 | 0 | -2.23 | firefox | 20 | Rendering | 100 | 176 | 94 | -82 | -46.67 | faster firefox | 21 | Overall | 100 | 181 | 102 | -79 | -43.77 | faster firefox | 21 | Page Request | 100 | 2 | 2 | 0 | 12.36 | slower firefox | 21 | Rendering | 100 | 179 | 99 | -79 | -44.34 | faster firefox | 22 | Overall | 100 | 140 | 84 | -55 | -39.59 | faster firefox | 22 | Page Request | 100 | 2 | 2 | 0 | 12.50 | firefox | 22 | Rendering | 100 | 138 | 82 | -55 | -40.25 | faster firefox | 23 | Overall | 100 | 119 | 73 | -46 | -38.48 | faster firefox | 23 | Page Request | 100 | 2 | 2 | 1 | 35.71 | slower firefox | 23 | Rendering | 100 | 117 | 71 | -46 | -39.48 | faster firefox | 24 | Overall | 100 | 165 | 96 | -68 | -41.51 | faster firefox | 24 | Page Request | 100 | 2 | 2 | 0 | 2.81 | firefox | 24 | Rendering | 100 | 163 | 94 | -68 | -42.00 | faster ```

This moves the `COMPILE_TYPE3_GLYPHS`/`MAX_SIZE_TO_COMPILE`-checks into the `compileType3Glyph` function itself, which allows for some simplification at the call-site. These changes also mean that the `COMPILE_TYPE3_GLYPHS`-check is now done *once* per Type3-glyph, rather than everytime that the glyph is being rendered.

Snuffleupagus · 2022-05-01T12:02:11Z

/botio test

pdfjsbot · 2022-05-01T12:02:12Z

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pdfjsbot · 2022-05-01T12:02:12Z

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calixteman

Nice improvement !

timvandermeij

r=me with passing tests. Thank you for optimizing this!

pdfjsbot · 2022-05-01T12:28:58Z

From: Bot.io (Linux m4)

Failed

Full output at http://54.241.84.105:8877/f64aa40958562db/output.txt

Total script time: 26.75 mins

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

  different ref/snapshot: 6
  different first/second rendering: 1

Image differences available at: http://54.241.84.105:8877/f64aa40958562db/reftest-analyzer.html#web=eq.log

pdfjsbot · 2022-05-01T12:29:14Z

From: Bot.io (Windows)

Success

Full output at http://54.193.163.58:8877/d52f631469692a1/output.txt

Total script time: 27.02 mins

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

Snuffleupagus added performance font-type3 labels Apr 30, 2022

calixteman reviewed Apr 30, 2022

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Snuffleupagus force-pushed the Type3-Path2D branch from f548324 to 0b6e2d5 Compare April 30, 2022 13:55

timvandermeij reviewed Apr 30, 2022

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src/shared/util.js Outdated Show resolved Hide resolved

calixteman reviewed Apr 30, 2022

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Snuffleupagus force-pushed the Type3-Path2D branch 3 times, most recently from b99a8a0 to ba5b667 Compare May 1, 2022 11:33

Snuffleupagus added 2 commits May 1, 2022 13:56

Snuffleupagus force-pushed the Type3-Path2D branch from ba5b667 to e658acf Compare May 1, 2022 11:57

Snuffleupagus requested review from calixteman and timvandermeij May 1, 2022 12:03

calixteman approved these changes May 1, 2022

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timvandermeij merged commit 5ec8c3c into mozilla:master May 1, 2022

Snuffleupagus deleted the Type3-Path2D branch May 1, 2022 12:32

Snuffleupagus mentioned this pull request May 8, 2022

Time for a new release? #14892

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Use `Path2D`, if available, when rendering Type3-fonts (bug 810214) #14858

Use `Path2D`, if available, when rendering Type3-fonts (bug 810214) #14858

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Use Path2D, if available, when rendering Type3-fonts (bug 810214) #14858

Use Path2D, if available, when rendering Type3-fonts (bug 810214) #14858

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Use `Path2D`, if available, when rendering Type3-fonts (bug 810214) #14858

Use `Path2D`, if available, when rendering Type3-fonts (bug 810214) #14858

timvandermeij commented Apr 30, 2022 •

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