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Replace the DroidSansFallback TTF files with a TTC that has two fonts:
The original and a copy where the OpenType 'vert' substitution
lookup has been pre-applied by copying the uniXXXX.vert glyph data
to uniXXXX.
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OpenType CFF fonts are detected as TYPE1 by ft_kind.
Relaxing the test for when to load a CIDToGIDMap lets us load
it even for OpenType fonts.
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See https://code.google.com/p/sumatrapdf/issues/detail?id=2526 for a
file which renders wrongly if no encoding is loaded.
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The following changes allow font providers to make better choices WRT
what font to provide and under what circumstances:
* bold and italic flags are passed in so that implementors can decide
themselves whether to ask for simulated boldening/italicising
if a font claims not to be bold/italic
* is_substitute is replaced with needs_exact_metrics to make the
meaning of this argument hopefully clearer (that argument is set only
for PDF fonts without a FontDescriptor)
* the font name is always passed as requested by the document instead
of the cleaned name for the standard 14 fonts which allows
distinguishing e.g. Symbol and Symbol,Bold
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For SumatraPDF, the following changes are required:
* fz_load_system_font is called from pdf_load_builtin_font as well so
that Arial, Courier New, etc. can be loaded from the system instead
of their Nimbus replacements. In order to distinguish between calls
from pdf_load_builtin_font and pdf_load_substitute_font, an
is_substitute argument is added.
* fz_load_system_cjk_font is added and called from
pdf_load_substitute_cjk_font so that a better replacement font can
be loaded instead of DroidSansFallback.
* Both fz_load_system_font and fz_load_system_cjk_font return fz_font*
instead of fz_buffer* so that implementers aren't required to load
fonts into memory (SumatraPDF uses fz_new_font_from_file for system
fonts).
In addition to that, fz_load_system_font_func is renamed to
fz_load_system_font_funcs since it now accepts two functions, and the
PDF_ROS_* constants are renamed to FZ_ADOBE_* (collection names aren't
passed as const char* so that implementers know which collections to
expect). For convenience, fz_load_*_font also never throws since
currently all callers have further fallbacks available.
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Some warnings we'd like to enable for MuPDF and still be able to
compile it with warnings as errors using MSVC (2008 to 2013):
* C4115: 'timeval' : named type definition in parentheses
* C4204: nonstandard extension used : non-constant aggregate initializer
* C4295: 'hex' : array is too small to include a terminating null character
* C4389: '==' : signed/unsigned mismatch
* C4702: unreachable code
* C4706: assignment within conditional expression
Also, globally disable C4701 which is frequently caused by MSVC not
being able to correctly figure out fz_try/fz_catch code flow.
And don't define isnan for VS2013 and later where that's no longer needed.
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fz_new_font_from_buffer keeps the buffer for the font, so callers which
no longer need the data have to drop the buffer themselves explicitly.
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Use fz_buffer to wrap and reference count data used in font.
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When putting store objects into the store, ensure that they do cannot
collide across documents.
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Prevously the true bounds of the glyph were used which didn't account
for the total area blocked out by a character
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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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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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