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Split functions out of pdf-form.c that shouldn't be there, and make
javascript initialization explicit.
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Currently fz_streams have a 4K buffer within their header. The call
to read from a stream fills this buffer, resulting in more data being
pulled from any underlying stream than we might like. This causes
problems with the forthcoming 'leech' filter.
Here we simplify the fields available in the public stream header.
No specific buffer is given; simply the read and write pointers.
The underlying 'read' function is replaced by a 'next' function
that makes the next block of data available and returns the first
character of it (or EOF).
A caller to the 'next' function should supply the maximum number of
bytes that it knows it will need (possibly not now, but eventually).
This enables the underlying stream to efficiently decode just enough.
The underlying stream is free to return fewer, or a greater number
if it wants to.
The exact size of the 'block' of data returned will depend on the
filter in use and (possibly) the data therein.
Callers can get the currently available amount of data by calling
fz_available (but again should pass the maximum amount of data they know
they will need). The only time this will ever return 0 is if we have
hit EOF.
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We add various facilities here, intended to allow us to efficiently
minimise the memory we use for holding cached pdf objects.
Firstly, we add the ability to 'mark' all the currently loaded objects.
Next we add the ability to 'clear the xref' - to drop all the currently
loaded objects that have no other references except the ones held by the
xref table itself.
Finally, we add the ability to 'clear the xref to the last mark' - to
drop all the currently loaded objects that have been created since the
last 'mark' operation and have no other references except the ones held
by the xref table.
We expose this to the user by adding a new device hint 'FZ_NO_CACHE'.
If set on the device, then the PDF interpreter will pdf_mark_xref before
starting and pdf_clear_xref_to_mark afterwards. Thus no additional
objects will be retained in memory after a given page is run, unless
someone else picks them up and takes a reference to them as part of
the run.
We amend our simple example app to set this device hint when loading
pages as part of a search.
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We define a document handler for each file type (2 in the case of PDF, one
to handle files with the ability to 'run' them, and one without).
We then register these handlers with the context at startup, and then
call fz_open_document... as usual. This enables people to select the
document types they want at will (and even to extend the library with more
document types should they wish).
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Thanks to 'tom' from irc for pointing this out.
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Set display timeout where the page number is shown, not in x11 main.
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The scenario is that the user first displayed the page number (visible
for two seconds) and then searched while the page number was still
visible. The page number was automatically cleared when entering search
text, but the timeout for clearing the page number was never cancelled.
This caused an unnecessary redraw of the window while the search text
was still being edited.
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Based on a patch from Sebastian Neuser - many thanks.
Use mouse buttons 6 and 7 to do the same as 4 and 5, but with Y
rather than X being the default.
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Windows and X11. Allows files to be fetched and displayed
as they are downloaded both with and without linearization, using
hints if available.
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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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