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Introduce the concept of 'packed' paths. These reduce the header
overhead for most common paths (ones with less than 256 commands
and 256 coords) to a single 32bit int once stored in the
display list.
The previous commit reduces the torture-test.pdf from 95 to 87Meg.
This commit futher reduces it to 70Meg.
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Update buffer and filter processors.
Filter both colors and stroke states.
Move OCG hiding logic into interpreter.
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When we meet cached tiles when rendering the display list, we need to
skip over their contents. Previously we did this by skipping
display list nodes in their entirety.
With the new display list scheme however, we cannot simply skip
nodes completely as the graphic state changes must be remembered.
We therefore update the list playback routine to keep track of the
clip depth and to skip the function calls as required.
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I was testing an untransformed rectangle. This was not being picked up
as our cluster tests use the identity matrix.
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Rather than a linked list of display nodes, we use solid block of
serialised data. We send a 32bit word, which contains various bitfields.
These bitfields indicate the command type, and the presence or absence
of various fields (such as paths, colorspaces, colors etc).
If these fields are not present, they are held to be the same as the
previous values.
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Purge several embedded contexts:
Remove embedded context in fz_output.
Remove embedded context in fz_stream.
Remove embedded context in fz_device.
Remove fz_rebind_stream (since it is no longer necessary).
Remove embedded context in svg_device.
Remove embedded context in XML parser.
Add ctx argument to fz_document functions.
Remove embedded context in fz_document.
Remove embedded context in pdf_document.
Remove embedded context in pdf_obj.
Make fz_page independent of fz_document in the interface.
We shouldn't need to pass the document to all functions handling a page.
If a page is tied to the source document, it's redundant; otherwise it's
just pointless.
Fix reference counting oddity in fz_new_image_from_pixmap.
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Rename fz_close to fz_drop_stream.
Rename fz_close_archive to fz_drop_archive.
Rename fz_close_output to fz_drop_output.
Rename fz_free_* to fz_drop_*.
Rename pdf_free_* to pdf_drop_*.
Rename xps_free_* to xps_drop_*.
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Disallow modification of shared fz_path and fz_text objects.
They should follow a create once, consume often pattern, and as such should
be immutable once created.
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Add a new class of errors and use them to abort interpretation when
the test device detects a color page.
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(Revert the fix for potential memory leak - there wasn't a potential memory
leak as the device only takes ownership of it's display list if
dev->free_user is set).
This reverts commit ada560eb015e7b2208c492d47f28da8093733c4a.
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FZ_CMD_CLIP_TEXT behaves quite differently whether the accumulate flag
is set or not (see fz_list_clip_text). fz_run_display_list handles this
correctly but fz_append_display_node doesn't do so yet.
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