Now that the content stream is no longer split into multiple streams
it is not possible to implement a copy_page function that shares the
common content between pages.
Remove this function so the paginated surface will rewrite the
content from the meta surface.
Each fallback image needs to be in a separate group in the knockout
group. Otherwise transparent edges of adjacent fallback images will
composite with each other creating visible seams between the images.
The PDF surface needs to know when the fallback images start so it can
close off the content stream and create a knockout transparency group
for the fallback images. Currently it does this by looking for
operations with CAIRO_OPERATOR_SOURCE. PDF returns unsupported for
_SOURCE during the analysis phase so _SOURCE will never appear during
native operations. However this prevents the PDF surface from
supporting _SOURCE operations that can be natively supported. For
example a _SOURCE operation with nothing painting under it can be
converted to _OVER and natively supported.
A third mode, CAIRO_PAGINATED_MODE_FALLBACK, has been added. The
paginated surface will set this mode before it paints finer-grained
fallback images.
Previously this was done in a separate group. Now that the PDF backend
has been re-organized to not interrupt the content stream the clipping
can be done in the same stream.
To fix this performance issue
http://lists.cairographics.org/archives/cairo/2007-December/012197.html
the PDF surface needs to avoid starting and stopping the content
stream every time it emits a pattern. This patch makes the PDF surface
store a list of all patterns used while the content stream is written
out then write out all the patterns after the content stream is
closed.
This code is never used because outline glyphs that go through the
fallback path are always embedded with Type 1 fallback. The only fonts
that are embedded as Type 3 are bitmap fonts.
Do not return after encountering the first error whilst closing streams,
but continue to close any auxiliary streams before finally reporting the
error. Also during finalize check that we have closed any streams that
may have been left open after encountering an error.
This was failing with more than one level of push/pop group. The
problem was that the meta surface replay in PS/PDF emit_meta_surface
was replaying all the meta surface commands insteads of only the
natively supported commands. The analysis surface has also been
changed to replay meta surface patterns back to the one analysis
surface instead of creating a separate analysis surface for each
pattern. The analysis surface now transforms bounding boxes with the
meta surface pattern matrix so that fallback regions are correctly
tracked.
Distinguish the UNSUPPORTED case where the font backend does not
support conversion to unicode from other fatal errors by returning a
status value rather than using stream.id == 0 to indicate any error.
Ensure we restore the surface->current_group if we encounter an error
during _cairo_pdf_surface_emit_meta_surface() lest we leak the
current_group array.
During _cairo_pdf_surface_create_for_stream_internal() destroy all
locally allocated resources and the output stream if we fail to create
the pdf surface or its paginated wrapper.
Every time we assign or return a hard-coded error status wrap that value
with a call to _cairo_error(). So the idiom becomes:
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
or
return _cairo_error (CAIRO_STATUS_INVALID_DASH);
This ensures that a breakpoint placed on _cairo_error() will trigger
immediately cairo detects the error.
The content stream compression that was previously implemented was
inadvertently bypassed when the new stream handling for meta surface
patterns was implemented.
The finer-grained fallbacks would not work correctly if the page
was set to a larger size.
Add _cairo_paginated_surface_set_size() function that is called
from cairo_ps_surface_set_size() and cairo_pdf_surface_set_size().
The BC (background color) in the smask of the recently added
cairo_mask() support was causing Ghostscript to crash due to the wrong
number of BC values. The BC entry has been removed as BC default color
is already what we want.
