Method: VIPS::Mask#initialize

Defined in:
ext/mask.c

#new(coeffs, scale = 1, offset = 0) ⇒ Object

Create a new Mask object. coeffs is a two-dimensional array where every row must have the same length. Note that some methods require a mask where all values in coeffs are whole integers.


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# File 'ext/mask.c', line 97

static VALUE
mask_initialize(int argc, VALUE *argv, VALUE obj)
{
    VALUE coeffs, scale, offset;
    vipsMask *msk;
    Data_Get_Struct(obj, vipsMask, msk);

  rb_scan_args(argc, argv, "12", &coeffs, &scale, &offset);

    if (NIL_P(scale))
        scale = INT2NUM(1);

    if (NIL_P(offset))
        offset = INT2NUM(0);

    if(TYPE(scale) == T_FIXNUM && TYPE(offset) == T_FIXNUM &&
        ary_is_int_2d(coeffs)) {
        msk->imask = mask_ary2imask(coeffs);
        msk->imask->scale = NUM2INT(scale);
        msk->imask->offset = NUM2INT(offset);
    }

    msk->dmask = mask_ary2dmask(coeffs);
    msk->dmask->scale = NUM2DBL(scale);
    msk->dmask->offset = NUM2DBL(offset);

    return obj;
}