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Re-factor the LocalTilingPatternCache to cache by Ref rather than Name (PR 12458 follow-up, issue 13780) #13904

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Snuffleupagus
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This way there cannot be any incorrect cache hits, since Refs are guaranteed to be unique.
Please note that the reason for caching by Ref rather than doing something along the lines of the localShadingPatternCache (which uses a Map directly), is that TilingPatterns are streams and those cannot be cached on the XRef-instance (this way we avoid unnecessary parsing).

Fixes #13780

…ame (PR 12458 follow-up, issue 13780)

This way there cannot be any *incorrect* cache hits, since Refs are guaranteed to be unique.
Please note that the reason for caching by Ref rather than doing something along the lines of the `localShadingPatternCache` (which uses a `Map` directly), is that TilingPatterns are streams and those cannot be cached on the `XRef`-instance (this way we avoid unnecessary parsing).
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/botio test

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From: Bot.io (Windows)


Received

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

Live output at: http://3.101.106.178:8877/2ce2eff49cd3334/output.txt

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From: Bot.io (Linux m4)


Received

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

Live output at: http://54.67.70.0:8877/983ac6bf82091b2/output.txt

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From: Bot.io (Linux m4)


Failed

Full output at http://54.67.70.0:8877/983ac6bf82091b2/output.txt

Total script time: 33.57 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://54.67.70.0:8877/983ac6bf82091b2/reftest-analyzer.html#web=eq.log

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From: Bot.io (Windows)


Failed

Full output at http://3.101.106.178:8877/2ce2eff49cd3334/output.txt

Total script time: 34.06 mins

  • Font tests: Passed
  • Unit tests: Passed
  • Integration Tests: Passed
  • Regression tests: FAILED
  errors: 585
  different ref/snapshot: 7

Image differences available at: http://3.101.106.178:8877/2ce2eff49cd3334/reftest-analyzer.html#web=eq.log

@timvandermeij timvandermeij merged commit 1b3382f into mozilla:master Aug 21, 2021
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Looks good; thanks for improving this!

@Snuffleupagus Snuffleupagus deleted the fix-LocalTilingPatternCache branch August 21, 2021 15:15
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Tiling pattern cache may incorrectly cache patterns with same name
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