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JimBobSquarePants/GifEncoder.md

Last active December 17, 2016 10:59
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Performance improvements in the gif encoder
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GifEncoder.md

WIP improvements made so far in the gif encoder. All the time/memory usage is in the OctreeQuantizer.cs I don't know what quantizer System.Drawing uses (Most likely a fixed palette with pre-dithering) but the quality difference is incomparable.

It'll probably take a better mind than mine to bring the memory usage in the quantizer down further.

P.S ArrayPool<T> rocks!!!

Before

Method Mean StdDev Scaled Scaled-StdDev Gen 0 Allocated
'System.Drawing Gif' 13.5993 ms 0.4928 ms 1.00 0.00 - 1.12 MB
'ImageSharp Gif' 75.0405 ms 2.1495 ms 5.52 0.24 2645.8333 17.96 MB

After

Method Mean StdErr StdDev Scaled Scaled-StdDev Gen 0 Gen 1 Allocated
'System.Drawing Gif' 14.7249 ms 0.1580 ms 0.9866 ms 1.00 0.00 - - 1.12 MB
'ImageSharp Gif' 75.0355 ms 0.4332 ms 1.6777 ms 5.12 0.34 1187.5000 312.5000 9.22 MB

New After Massive improvement after removing boxing allocations.

Method Mean StdDev Scaled Scaled-StdDev Allocated
'System.Drawing Gif' 20.2133 ms 1.1400 ms 1.00 0.00 1.12 MB
'ImageSharp Gif' 86.3056 ms 0.8807 ms 4.28 0.23 2.74 MB
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