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    • Ell's avatar
      transform: round numerical errors in transformation matrix · 5b2c7dd4
      Ell authored
      In the transform ops, round numerical errors in the generated
      matrix to the nearest integer.  This is especially important when
      using the NEAREST sampler, which is sensitive to boundary
      conditions.
      
      In particular, a perfect 90-deg rotation matrix cannot be generated
      naively using the trigonometric functions (since there is no double
      x such that cos(x) = 1 exactly), which can cause a single row or
      column to be missing from the output in some cases.
      5b2c7dd4
    • Ell's avatar
      matrix: add gegl_matrix_round_error() · ddbeefcd
      Ell authored
      ... which rounds numerical errors in the matrix's coefficients to
      the nearest integer.
      ddbeefcd
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