Module png_filters::fallbacks

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Functions in this module are always available, they don’t depend on CPU intrinsics or even on a specific CPU architecture.

Functions

  • recon_average
    Recon(x) = Filt(x) + floor((Recon(a) + Recon(b)) / 2)
  • recon_average_top
    As [recon_average_fallback], but for the top line of a PNG.
  • recon_paeth
    Recon(x) = Filt(x) + PaethPredictor(Recon(a), Recon(b), Recon(c))
  • recon_sub
    Recon(x) = Filt(x) + Recon(a)
  • recon_up
    Recon(x) = Filt(x) + Recon(b)