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Diffstat (limited to 'TODO')
| -rw-r--r-- | TODO | 26 |
1 files changed, 26 insertions, 0 deletions
@@ -15,6 +15,32 @@ General ======= + * See whether it's possible to remove the call to + flattenScalarReferences. I can't easily figure out why I do it, + but removing it causes strange test failures in linearization. I + would have to study the optimization and linearization code to + figure out why I added this to begin with and what in the code + assumes it's the case. For enqueueObject and unparseChild in + QPDFWriter, simply removing the checks for indirect scalars seems + sufficient. + + To pursue this, remove the call to flattenScalarReferences in + QPDFWriter.cc and disable the logic_error exceptions for indirect + scalars. Just search for flattenScalarReferences in QPDFWriter.cc + since the logic errors have comments that mention + flattenScalarReferences. Then run the test suite. Several files + that explicitly test flattening of scalar references fail, but the + indirect scalars are properly preserved and written. But then + there are some linearized files that have a bunch of unreferenced + objects that contain scalars. Need to figure out what these are + and why they're there. Maybe they're objects that used to be + stream lengths. Probably we just need to make sure don't traverse + through a stream's /Length stream when enqueueing stream + dictionaries. + + If flattenScalarReferences is removed, a new method will be needed + for checking PDF files. + * For debugging linearization bugs, consider adding an option to save pass 1 of linearization. This code is sufficient. Change the interface to allow specification of a pass1 file, which would |