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JPEG loading speedup possible? #39

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p0nce opened this issue Jan 3, 2023 · 2 comments
Open

JPEG loading speedup possible? #39

p0nce opened this issue Jan 3, 2023 · 2 comments
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enhancement New feature or request

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p0nce commented Jan 3, 2023 •
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Graillon diffuse takes 34ms to decode, isn't it a bit much for a 1332 x 1276?

  • JPGD_SUPPORT_FREQ_DOMAIN_UPSAMPLING adds 7ms by itself
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p0nce commented Jan 3, 2023 •
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Using that 34ms time as baseline:

  • Try for Row and Col not to be templated
  • expanded convert seemingly can be optimized
  • Col!4.idct not great at all

@p0nce p0nce added the enhancement New feature or request label Jan 3, 2023
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p0nce commented Jan 5, 2023 •
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So, there was a small YUV to RGB speedup, we can perhaps remove the tables if generalized, which will win 4kb ram :|
The DCT/iDCT not that easy to optimize

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