Jbig2 optimizations #4434
Jbig2 optimizations #4434
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This might depend on PR #4431. |
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This PR doesn't really depend on #4431 but I pushed a micro optimization to the ArithmeticDecoder that would then benefit both JBIG2 and JPX |
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The #4431 was merged, could you rebase your changes? |
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Thanks. Done. |
| @@ -105,7 +105,7 @@ var Jbig2Image = (function Jbig2ImageClosure() { | |||
| offset = 340; | |||
| break; | |||
| default: | |||
| v = v * 2 + bit; | |||
| v = (v << 1) | bit; | |||
There was a problem hiding this comment.
This shall stay unsigned. Please add a note of danger this getting this singed, or use ((v << 1) | bit) >>> 0
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/botio test |
From: Bot.io (Windows)ReceivedCommand cmd_test from @yurydelendik received. Current queue size: 1 Live output at: http://107.22.172.223:8877/f4a400360ffc4a4/output.txt |
From: Bot.io (Linux)ReceivedCommand cmd_test from @yurydelendik received. Current queue size: 3 Live output at: http://107.21.233.14:8877/9ccf874ff811d88/output.txt |
From: Bot.io (Windows)SuccessFull output at http://107.22.172.223:8877/f4a400360ffc4a4/output.txt Total script time: 37.23 mins
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Moved the switch(combinationOperator) outside the width and height loops Check bitmap[i][j] before applying the switch(combinationOperator)
ltp can only become truthy if predition is true.
…ner loop There is no need to slow down the inner loop with a test for ltp as it can only change if prediction is true in which case it only changes in the outer loop.
From: Bot.io (Linux)SuccessFull output at http://107.21.233.14:8877/9ccf874ff811d88/output.txt Total script time: 25.95 mins
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/botio test |
From: Bot.io (Windows)ReceivedCommand cmd_test from @yurydelendik received. Current queue size: 0 Live output at: http://107.22.172.223:8877/c81c088bb963f73/output.txt |
From: Bot.io (Linux)ReceivedCommand cmd_test from @yurydelendik received. Current queue size: 0 Live output at: http://107.21.233.14:8877/ab322fd5543cc52/output.txt |
From: Bot.io (Linux)SuccessFull output at http://107.21.233.14:8877/ab322fd5543cc52/output.txt Total script time: 25.80 mins
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From: Bot.io (Windows)SuccessFull output at http://107.22.172.223:8877/c81c088bb963f73/output.txt Total script time: 37.14 mins
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Thank you for the patch |
~13% speed improvement in JBIG2 decoding.
Measured 10x the decoding time of ten 33M pixels JBIG2 images:
Average decoding time went from ~1440ms to ~1270ms in Opera, and ~1240ms to ~1060ms in Aurora