Lode Vandevenne
b8c44f1aa4
3% speed improvement for lossless webp encoder for low effort mode:
...
prevent updating unused histogram.
Benchmark on 1000 PNGs, 30 iterations, lossless, quality 0, method 0:
before: Compression (output/input): 2.9120/3.2667 bpp, Encode rate (raw data): 34.578 MP/s
after: Compression (output/input): 2.9120/3.2667 bpp, Encode rate (raw data): 36.980 MP/s
Change-Id: Id62759d4d111a6ba41c85c611a15d4f6ffc9f935
2015-11-22 09:12:54 +01:00
Jyrki Alakuijala
85b44d8a69
lossless: encoding, don't compute unnecessary histo
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share the computation between different modes
3-5 % speedup for lossless alpha
1 % for lossy alpha
no change in compression density
Change-Id: I5e31413b3efcd4319121587da8320ac4f14550b2
2015-07-07 20:24:26 -07:00
James Zern
39216e59d9
cosmetics: fix indent after 32462a07
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Change-Id: If9a5d91c25e981bc4cd81adb476244e63fc7c3c8
2015-07-01 23:49:20 -07:00
Pascal Massimino
7017001462
SSE2: speed-up some lossless-encoding functions
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optimized: CollectColorRedTransforms, CollectColorBlueTransforms, SubtractGreenFromBlueAndRed
overall effect is sub-1% speed-up, though.
Change-Id: I9cb49af5c56e4c03db417929b0a2cf575d60a5c6
2015-06-24 20:09:13 -07:00
Pascal Massimino
32462a072c
Speedup to HuffmanCostCombinedCount
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~3% speedup for lossless encoding
Improves compression ratio by ~0.03%
Change-Id: Ic6d05fb0b1099b5ca56689b92b1c6515d54a5d6b
2015-06-23 16:41:03 +02:00
Pascal Massimino
f3d687e3fa
SSE4.1 implementation of some lossless encoding functions
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New implementations: SubtractGreenFromBlueAndRed and TransformColor
around 1-2% faster lossless encoding.
Change-Id: I1668e36fdc316ba55b3b798b91b4a3e36ce62861
2015-06-23 08:46:57 +02:00
James Zern
65ef5afc27
Merge "lossless: 0.13% compression density gain"
2015-06-03 03:02:09 +00:00
Jyrki Alakuijala
2beef2f245
lossless: 0.13% compression density gain
...
over a 1000 image corpus
Single photograph benchmark:
Before:
Q=20: 2.560 MP/s
Q=40: 2.593 MP/s
Q=60: 1.795 MP/s
Q=80: 1.603 MP/s
Q=99: 1.122 MP/s
After:
Q=20: 3.334 MP/s
Q=40: 2.464 MP/s
Q=60: 2.009 MP/s
Q=80: 1.871 MP/s
Q=99: 1.163 MP/s
This CL allows for some further improvements that would not be possible
otherwise.
Change-Id: I61ba154beca2266cb96469281cf96e84a4412586
2015-06-02 17:27:36 -07:00
Pascal Massimino
3033f24c26
lossless: 0.06 % compression density improvement
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Change-Id: Ib662e6aec53b40d6bc736d3ecfd6475bb005c790
2015-06-02 14:51:51 +02:00
Pascal Massimino
c64659e1b4
remove duplicate variables after the lossless{_enc}.c split
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clang was giving "duplicate symbols" error messages at link time.
Change-Id: I2b77b55222fe033cc1d4636567902e80d814aab6
2015-03-25 11:10:21 +01:00
James Zern
553051f741
dsp/lossless: split enc/dec functions
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adds lossless_enc*.c; reduces the size of the decode-only so: ~78K
w/gcc-4.8.2 on x86_64.
Change-Id: If5e4610b67d05eba5896bc64bab79e9df92b2092
2015-03-23 22:57:50 -07:00
