Method getDefaultMetadata

Engine/EffectInstance.cpp:5358–5553

}

StatusEnum
EffectInstance::getDefaultMetadata(NodeMetadata &metadata)
{
    NodePtr node = getNode();

    if (!node) {
        return eStatusFailed;
    }

    const bool multiBitDepth = supportsMultipleClipDepths();
    int nInputs = getNInputs();
    metadata.clearAndResize(nInputs);

    // OK find the deepest chromatic component on our input clips and the one with the
    // most components
    bool hasSetCompsAndDepth = false;
    ImageBitDepthEnum deepestBitDepth = eImageBitDepthNone;
    int mostComponents = 0;

    //Default to the project frame rate
    double frameRate = getApp()->getProjectFrameRate();
    std::vector<EffectInstancePtr> inputs(nInputs);

    // Find the components of the first non optional connected input
    // They will be used for disconnected input
    int firstNonOptionalConnectedInputComps = 0;
    for (std::size_t i = 0; i < inputs.size(); ++i) {
        inputs[i] = getInput(i);
        if ( !firstNonOptionalConnectedInputComps && inputs[i] && !isInputOptional(i) ) {
            firstNonOptionalConnectedInputComps = inputs[i]->getMetadataNComps(-1);
        }
    }

    double inputPar = 1.;
    bool inputParSet = false;
    ImagePremultiplicationEnum premult = eImagePremultiplicationOpaque;
    bool premultSet = false;
    for (int i = 0; i < nInputs; ++i) {
        const EffectInstancePtr& input = inputs[i];
        if (input) {
            frameRate = std::max( frameRate, input->getFrameRate() );
        }


        if (input) {
            if (!inputParSet) {
                inputPar = input->getAspectRatio(-1);
                inputParSet = true;
            }
        }

        int rawComp = getUnmappedComponentsForInput(this, i, inputs, firstNonOptionalConnectedInputComps);
        ImageBitDepthEnum rawDepth = input ? input->getBitDepth(-1) : eImageBitDepthFloat;
        ImagePremultiplicationEnum rawPreMult = input ? input->getPremult() : eImagePremultiplicationPremultiplied;

        // Note: first chromatic input gives the default output premult too, even if not connected
        // (else the output of generators may be opaque even if the host default is premultiplied)
        if ( ( rawComp == 4 ) && (input || !premultSet) ) {