With the introduction of the error callbacks for PNG, we have the
opportunity for the user to set a breakpoint (via _cairo_error) at the
point the error is first rasied.
We wish to avoid writing to file descriptors (and streams) that are
outside cairo's control. In this case, the messages are superfluous as
the errors are propagated via the cairo_status_t returns.
To build, do:
make malloc-stats.so
inside util/, and to use, run:
LD_PRELOAD=malloc-stats.so some-program
For binaries managed by libtool, eg, cairo-perf, do:
../libtool --mode=execute /bin/true ./cairo-perf
LD_PRELOAD="../util/malloc-stats.so" .libs/lt-cairo-perf
The code also includes Jeff Muizelaar's libbacktracesymbols that
is a much better implementation of backtrace_symbols() than what
is provided by glibc. That can be built by:
make backtrace-symbols.so
I introduced some compiler warnings into read_png() with the superfluous
introduction of a couple of volatile qualifiers. I'm sure at the time,
the reason was that gcc suggested adding them - however, ATM gcc issues
no warnings without them.
The CID font subsetting exposed a bug where the subset_glyph->is_scaled
return argument of _cairo_scaled_font_subsets_map_glyph() is sometimes
not assigned a value.
Make cairo-scaled-font-subsets.c limit Type1 font subsets to
256 glyphs. This allows Type1 subsetting to be enabled again
with type1-fallback as the fallback option for Type1 fonts.
Switching to CID font embedding requires a fallback font for
the case where CFF CID or TrueType CID subsetting fails.
The new function _cairo_type2_charstrings_init() added to
cairo-type1-fallback.c creates Type2 charstrings from glyph
paths. _cairo_cff_fallback_init() in cairo-cff-subset.c
wraps these charstrings in a CFF CID font.
OpenType/CFF fonts come in two types: CID and non CID.
CFF CID font subsetting was previously disabled in cairo
due 1) to the need to embed CFF CID fonts in PDF as a CID fonts
and 2) there is no easy way to convert CFF CID to CFF non CID.
With the switch to CID fonts cairo-cff-subset.c has been
updated to subset CID fonts and to covert non CID fonts to
CID. A further advantage of converting non CID CFF fonts
to CID is the reduction in size due to not embedding the
name of each glyph in the font subset.
cairo-scaled-font-subsets.c now provides three functions for creating subsets:
_cairo_scaled_font_subsets_create_scaled()
Create a subset for each scaled font with maximum size INT_MAX.
_cairo_scaled_font_subsets_create_simple()
Create subsets suitable for embedding as simple fonts in PS/PDF.
_cairo_scaled_font_subsets_create_composite()
Create subsets suitable for embedding as composite fonts in PS/PDF.
The _create_simple() and _create_composite() functions both merge
scaled fonts with the same face and an outline path available into
the same subset. _create_composite() has a maximum subset size of
65536 for outline fonts. Bitmap fonts have a separate subset for
each scale with a maximum subset size of 256.
The _create_simple() and _create_composite() functions both reserve
the first glyph in the subset for the .notdef glyph. CID fonts require
CID 0 to be .notdef.
Update Type1, TrueType and CFF subsetting to expect glyph 0 of each
subset to be the .notdef.
