Function getKeyIndex

Engine/OfxParamInstance.cpp:163–224

}

static
OfxStatus
getKeyIndex(const KnobIPtr& knob,
            OfxTime time,
            int direction,
            int & index,
            int startDim = -1,
            int endDim = -1)
{
    OfxKeyFramesSet keyframes;

    getOfxKeyFrames(knob.get(), keyframes, startDim, endDim);
    int i = 0;
    if (direction == 0) {
        //search for key at indicated time
        for (OfxKeyFramesSet::iterator it = keyframes.begin(); it != keyframes.end(); ++it, ++i) {
            if (std::abs(*it - time) < NATRON_CURVE_X_SPACING_EPSILON) {
                index = i;

                return kOfxStatOK;
            }
        }
    } else if (direction < 0) {
        //search for key before indicated time
        OfxKeyFramesSet::iterator next = keyframes.begin();
        if ( !keyframes.empty() ) {
            ++next;
        }
        for (OfxKeyFramesSet::iterator it = keyframes.begin(); it != keyframes.end(); ++it, ++i) {
            if (*it < time) {
                if ( next != keyframes.end() ) {
                    if (*next > time) {
                        index = i;

                        return kOfxStatOK;
                    }
                } else {
                    index = i;
                    assert(i == (int)keyframes.size() - 1);

                    return kOfxStatOK;
                }
            } else {
                return kOfxStatFailed;
            }
            if ( !keyframes.empty() ) {
                ++next;
            }
        }
    } else if (direction > 0) {
        ///Find the first keyframe that is considered to be after the given time
        for (OfxKeyFramesSet::iterator it = keyframes.begin(); it != keyframes.end(); ++it, ++i) {
            if (*it > time) {
                index = i;

                return kOfxStatOK;
            }
        }