jpeg: port LLM IDCT from stb_image #232
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Ports stb_images LLM IDCT implementation which is based off of `Practical fast 1-D DCT algorithms with 11 multiplications` and named after its authors. Results in ~20% speed increase in IDCT (1-2% overall). This also makes it easier to use simd implementations. Also fixes jpeg_test pixel values due to rounding changes.
Reduce code duplication
If we've checked fast_bits, then we only need to check the lengths that are greater than fast_bits. Improves overall decode performance by ~ 1.5%
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Ports stb_images LLM IDCT implementation which is based off of
Practical fast 1-D DCT algorithms with 11 multiplicationsand named after its authors.Results in ~20% speed increase in IDCT (1-2% overall)