[api-minor] Add a temporary function-cache in AlternateCS.prototype.getRgbBuffer, and disable eval support by default
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AlternateCS.prototype.getRgbBufferAlternateCS.prototype.getRgbBuffer, and disable eval support by default
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AlternateCS.prototype.getRgbBuffer, and disable eval support by defaultAlternateCS.prototype.getRgbBuffer, and disable eval support by default
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This supplements, rather than replaces, the existing caching in `PDFFunction.constructPostScript` since that one still makes sense given that functions are cached on the page-level. Using an additional cache helps improve performance because: - There are many fewer function calls, and overall less parsing this way. - For the common case of `Uint8Array`-data we're able to use integer cache-keys, which is a lot faster than string concatenation. This significantly improves performance of the `pr5134` test-case with `isEvalSupported = false` set, and testing locally in the viewer: - With the `master` branch and `isEvalSupported = true`, page 2 renders in approx. 340 milliseconds. - With the `master` branch and `isEvalSupported = false`, page 2 renders in approx. 1200 milliseconds. - With this patch and `isEvalSupported = false`, page 2 renders in approx. 380 milliseconds. While this is obviously still slower, the difference is now small enough that it shouldn't be too much of an issue in practice (compare with PR 18070) and the `pr5134` test-case is an especially "bad" one w.r.t. its PostScript function use.
The idea behind this patch is to see if disabling of `eval` leads to any reports about bad performance, since the previous patch should have improved things a fair bit.
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nicolo-ribaudo
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Mar 11, 2025
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Add a temporary function-cache in
AlternateCS.prototype.getRgbBufferThis supplements, rather than replaces, the existing caching in
PDFFunction.constructPostScriptsince that one still makes sense given that functions are cached on the page-level.Using an additional cache helps improve performance because:
There are many fewer function calls, and overall less parsing this way.
For the common case of
Uint8Array-data we're able to use integer cache-keys, which is a lot faster than string concatenation.This significantly improves performance of the
pr5134test-case withisEvalSupported = falseset, and testing locally in the viewer:With the
masterbranch andisEvalSupported = true, page 2 renders in approx. 340 milliseconds.With the
masterbranch andisEvalSupported = false, page 2 renders in approx. 1200 milliseconds.With this patch and
isEvalSupported = false, page 2 renders in approx. 380 milliseconds.While this is obviously still slower, the difference is now small enough that it shouldn't be too much of an issue in practice (compare with PR Use fuzzy-matching to improve cache hit rates with
PostScriptEvaluator#18070) and thepr5134test-case is an especially "bad" one w.r.t. its PostScript function use.[api-minor] Disable
evalsupport by defaultThe idea behind this patch is to see if disabling of
evalleads to any reports about bad performance, since the previous patch should have improved things a fair bit.