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By default an OCG is supposed to be visible (for a testcase, see
2011 - ocg without ocgs invisible.pdf). Also, the default visibility
value can be overwritten in both ways, so that pdf_is_hidden_ocg
must check the state both for being "OFF" and "ON" (testcase was
2066 - ocg not printed.pdf rendered with event="Print").
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The symptoms were that, created annoations were in some cases not saved.
Some updated objects withing the document were not being moved into the
incremental-save xref section. That in turn was due to nodes within the
hierarchy of those objects not having their parent_num field set. The
objects falling foul of this problem were those held in object streams.
When any one object from a stream is cached, the whole stream is read and
all other objects from that stream are also cached, but only the initial
one has its parent_num set. This patch ensures that all objects from a
stream are accounted for. In fact, for the initially-requested object, we
now set parent_num twice, but that is harmless and the code to avoid doing
so wouls be an unnecessary complication.
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Use of the feature is currently enabled only in the case that a file
that already contains xref streams is being updated incrementally. To
do so in that case is necessary because an old-style xref is then not
permitted.
This fixes bug #694527
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We are testing this using a new -p flag to mupdf that sets a bitrate at
which data will appear to arrive progressively as time goes on. For
example:
mupdf -p 102400 pdf_reference17.pdf
Details of the scheme used here are presented in docs/progressive.txt
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No more caching a flattened page tree in doc->page_objs/refs.
No more flattening of page resources, rotation and boxes.
Smart page number lookup by following Parent links.
Naive implementation of insert and delet page that doesn't rebalance the trees.
Requires existing page tree to hook into, cannot be used to create a page tree
from scratch.
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Thanks to zeniko for spotting the problem here.
Type 3 fonts contain a reference to the resources objects required
to render the glyphs. Traditionally these have been freed when the
font is freed. Unfortunately, after recent changes, freeing a PDF
object requires the pdf_document concerned to still exist.
While in most cases the type 3 resources are not used after we have
converted the type3 glyphs to display lists, this is not always the
case. For uncachable Type 3 glyphs (such as those that do not
completely define elements in the graphics state that they use, such
as color or line width), we end up running the glyphs at interpretation
time.
[ Interpretation time = when doing a direct render on the main thread,
or when creating a display list - so also on the main thread. No
multi-threading issues with file access here. ]
The fix implemented here is for each pdf document to keep a list of
the type3 fonts it has created, and to 'decouple' them from the
document when the document is destroyed. The sole effect of this
decoupling is to remove the resources (and the PDF operator buffers)
from the font. These are only ever used during interpretation, and
no further interpretations are possible without the document being
alive anyway, so this should have no net effect on operation, other
than allowing cleanup to proceed cleanly later on.
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Make pdf_specifics callable with a NULL doc, as was fz_interact, which
it replaces.
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Thanks to zeniko for spotting these problems.
When we close a document, purge the glyph cache to ensure that
no type3 glyphs hang around with pointers to pdf_obj's that
are now gone.
Pass doc to pdf_new_obj_from_str rather than NULL. We believe
that the reason this needed to be NULL is no longer valid.
Also, revert to using an int for ref counts.
In a quick test of our regression suite we only found 2 files
that ever made a refcount > 256 (and they never got larger than
768), but the potential is there for issues. Reverting to an
int until we can think of a better idea.
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Never allow a new xref_section to be smaller than a previous
one, as this makes pdf_xref_len(xref) get unexpectedly
smaller.
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For historical reasons lots of the code uses "xref" when talking about
a pdf document. Now pdf_xref is a separate type this has become
confusing, so replace 'xref' with 'doc' for clarity.
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Remove the fz_context field to avoid the structure growing.
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* at one place, code returns from inside an fz_try which borks up the
error stack
* pdf_load_xref wrongly assumes that at least one non-empty xref has
been read if there were no errors thrown during parsing
* pdf_repair_xref skips integers when object numbers are out of range
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