[FOP-2445] PDF Linearization

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Assignee: Simon Steiner
• Reporter: Simon Steiner
• Created: 06/Feb/15 12:05
• Updated: 24/Feb/15 11:58
• Resolved: 24/Feb/15 11:58

Description

Linearization is helpful to allow viewing of pdf over a slow connection.

Feature will be disabled by default, can be enabled with

<fop version="1.0">
  <renderers>
    <renderer mime="application/pdf">
      <linearization>true</linearization>
    </renderer>
  </renderers>
</fop>

Branch:
https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_PDFLinearization

Some changes:
Postpone writing PDF until end of document is reached.
Split cross reference table into two, one for first page objects, the other for the remaining objects.
Use an object number place holder for every object and an object number generator.
Build mapping between objects and pages.
Assign effective numbers to objects.
Write catalog and first page objects before writing remaining objects.
Write objects to file in order of object number.
Create linearization dictionary and adapt cross reference tables.
Create hint tables.