Improve Performance of TTFunk::Table::OS2#group_original_code_points_by_bit #83
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kokuyouwind
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@kokuyouwind Thank you for your contribution. The numbers look great. @camertron Could you please take a quick look? |
camertron
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Jun 9, 2020
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is there any progress? i'm looking forward to merging this fix🥺 |
pointlessone
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Jan 5, 2021
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@kokuyouwind Could you please rebase your branch on top of the current master? |
…by_bit Original Code takes O(N * M) time where N is UNICODE_RANGES size and M is code_map keys size Improved Code takes O(MAX(N, M)) time
kokuyouwind
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@pointlessone OK, rebased. |
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@pointlessone @camertron or somebody authorized, |
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Abstruct
fix #82
Original code takes
O(N * M)time where N is UNICODE_RANGES size and M is code_map keys size.Improved code takes
O(max(N, M))time.Idea
Original code calls
r.cover?with all pair ofUNICODE_RANGESandcode_map keys.This takes
O(N * M)time.If
UNICODE_RANGESandcode_map keysare both sorted, firstUNICODE_RANGEcontains somecode_map keysof the head flagment (or empty), nextUNICODE_RANGEcontains next flagment, and so on.This storategy loops
UNICODE_RANGESandcode_map keysindivisualy, so it takesO(max(N, M))time.Performance Test Result
I measure
Problem: TTFunk::Subset#encodetime with #82 reproduction code.(English Font changed to 'spec/fonts/DejaVuSans.ttf')It's about 8x faster than master branch, still 4x slower than 1.5.1 branch.