module PNG::Heuristic

Defined in:

png/heuristic.cr

Constant Summary

AVERAGE = ->(prev : Scanline | ::Nil, curr : Scanline) do curr.filter = FilterMethod::Average curr end

NONE = ->(prev : Scanline | ::Nil, curr : Scanline) do curr end

PAETH = ->(prev : Scanline | ::Nil, curr : Scanline) do curr.filter = FilterMethod::Paeth curr end

SUB = ->(prev : Scanline | ::Nil, curr : Scanline) do curr.filter = FilterMethod::Sub curr end

UP = ->(prev : Scanline | ::Nil, curr : Scanline) do curr.filter = FilterMethod::Up curr end