bool
qtCanvas::Impl::prepareMovie(CFStringRef path)
{
mPath = path;
CFRetain(mPath);
return (GetMoviesStickyError() == noErr) &&
setupMovie() && setupTrack() && setupCompression();
}
//------------------------------------------------------------------------------
xdm::RefPtr< DatasetIdentifier > createDatasetIdentifier(
const DatasetParameters& parameters ) {
// check if the dataset already exists within the given parent
htri_t exists = H5Lexists(
parameters.parent,
parameters.name.c_str(),
H5P_DEFAULT );
if ( exists ) {
if ( parameters.mode == xdm::Dataset::kCreate ) {
// the dataset exists and a create was requested, delete the existing one
H5Ldelete( parameters.parent, parameters.name.c_str(), H5P_DEFAULT );
} else {
// read or modify access, open and return the existing dataset
return openExistingDataset( parameters );
}
}
// the dataset doesn't exist. Read only access is an error.
if ( parameters.mode == xdm::Dataset::kRead ) {
XDM_THROW( xdm::DatasetNotFound( parameters.name ) );
}
// Determine the dataset access properties based off chunking and compression
// parameters.
xdm::RefPtr< PListIdentifier > createPList( new PListIdentifier( H5P_DEFAULT ) );
if ( parameters.chunked ) {
createPList->reset( H5Pcreate( H5P_DATASET_CREATE ) );
setupChunks( createPList->get(), parameters.chunkSize, parameters.dataspace );
// Chunking is enabled, so check for compression and enable it if possible.
if ( parameters.compress ) {
setupCompression( createPList->get(), parameters.compressionLevel );
}
}
// the mode is create or modify. In both cases we want to create it if it
// doesn't yet exist. It is safe to create the dataset here because we deleted
// the dataset earlier if it existed.
hid_t datasetId = H5Dcreate(
parameters.parent,
parameters.name.c_str(),
parameters.type,
parameters.dataspace,
H5P_DEFAULT,
createPList->get(),
H5P_DEFAULT );
return xdm::RefPtr< DatasetIdentifier >( new DatasetIdentifier( datasetId ) );
}
