Brendan Dahl da1af02ac8 Improve performance of reused patterns. ...

Bug 1721218 has a shading pattern that was used thousands of times.
To improve performance of this PDF:
 - add a cache for patterns in the evaluator and only send the IR form once
   to the main thread (this also makes caching in canvas easier)
 - cache the created canvas radial/axial patterns
 - for shading fill radial/axial use the pattern directly instead of creating temporary
   canvas

2021-07-22 16:47:40 -07:00

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