Imports github.com/unidoc/unipdf/v3/contentstream/draw github.com/unidoc/unipdf/v3/model github.com/unidoc/unipdf/v3/common github.com/unidoc/unipdf/v3/contentstream github.com/unidoc/unipdf/v3/core Standard library imports image unicode bytes errors fmt io math os sort strconv strings