void ImageNode::compute( ValuePlug *output, const Context *context ) const
{
ImagePlug *imagePlug = output->parent<ImagePlug>();
if( !imagePlug )
{
ComputeNode::compute( output, context );
return;
}
// we're computing part of an ImagePlug
if( !enabled() )
{
// disabled nodes just output a default black image.
output->setToDefault();
return;
}
// node is enabled - defer to our derived classes to perform the appropriate computation
if( output == imagePlug->formatPlug() )
{
static_cast<AtomicFormatPlug *>( output )->setValue(
computeFormat( context, imagePlug )
);
}
else if( output == imagePlug->dataWindowPlug() )
{
static_cast<AtomicBox2iPlug *>( output )->setValue(
computeDataWindow( context, imagePlug )
);
}
else if( output == imagePlug->metadataPlug() )
{
static_cast<CompoundObjectPlug *>( output )->setValue(
computeMetadata( context, imagePlug )
);
}
else if( output == imagePlug->channelNamesPlug() )
{
static_cast<StringVectorDataPlug *>( output )->setValue(
computeChannelNames( context, imagePlug )
);
}
else if( output == imagePlug->channelDataPlug() )
{
std::string channelName = context->get<string>( ImagePlug::channelNameContextName );
if( channelEnabled( channelName ) )
{
V2i tileOrigin = context->get<V2i>( ImagePlug::tileOriginContextName );
if( tileOrigin.x % ImagePlug::tileSize() || tileOrigin.y % ImagePlug::tileSize() )
{
throw Exception( "The image:tileOrigin must be a multiple of ImagePlug::tileSize()" );
}
static_cast<FloatVectorDataPlug *>( output )->setValue(
computeChannelData( channelName, tileOrigin, context, imagePlug )
);
}
else
{
output->setToDefault();
}
}
}
