Default First-Page Open View

Version 3.12.1 writes a default Catalog /OpenAction during full saves so newly generated PDFs open on page 1 with a /FitV destination. This sizes the first page to the viewer window height, showing the page top-to-bottom at the largest height-fitting zoom.

The default is guarded. PDFlibPas does not replace an OpenAction already present on the document catalog, and applications can override the default with SetOpenActionDestination, SetOpenActionDestinationFull, SetOpenActionMenu, or SetOpenActionJavaScript before saving.

Append and incremental-save workflows preserve the source document view instead of introducing a new default OpenAction. Use the explicit OpenAction APIs when an incremental output must change the first-open view.

Default catalog destination: D = [<page 1 reference> /FitV 0]