Function getTransformForDir

src/OpenColorIO/ConfigUtils.cpp:867–896

Return a transform in either the to_ref or from_ref direction for this color space. Return an identity matrix, if the color space has no transforms.

// Return an identity matrix, if the color space has no transforms.
//
ConstTransformRcPtr getTransformForDir(const ConstColorSpaceRcPtr & cs, ColorSpaceDirection dir)
{
    ColorSpaceDirection otherDir = COLORSPACE_DIR_TO_REFERENCE;
    if (dir == COLORSPACE_DIR_TO_REFERENCE)
    {
        otherDir = COLORSPACE_DIR_FROM_REFERENCE;
    }

    ConstTransformRcPtr t = cs->getTransform(dir);
    if (t) 
    {
        return t;
    }

    ConstTransformRcPtr tOther = cs->getTransform(otherDir);
    if (tOther) 
    {
        return invertTransform(tOther);
    }

    // If it's the reference space, it won't have a transform, so return an identity matrix.
    double m44[16];
    double offset4[4];
    MatrixTransform::Identity(m44, offset4);
    MatrixTransformRcPtr p = MatrixTransform::Create();
    p->setMatrix(m44);
    p->setOffset(offset4);

    return p;
}

// Get a transform to convert from the source config reference space to the
// destination config reference space.  The ref_space_type specifies whether