Minor.
[autofit] Variable renaming.

* src/autofit/aftypes.h (AF_ScriptMetricsRec):
s/clazz/script_class/.
Update all users.
[autofit] Introduce `writing systems'.

This patch adds a new top level to the auto-hinter's script class
hierarchy.  It defines `writing systems' which can contain multiple
scripts.

For example, the `latin' writing system (in file `aflatin.c') is
able to support scripts like Latin, Cyrillic, Armenian, etc., which
can be handled similarly.

Scripts are now named using four-letter OpenType tags.

* src/autofit/aftypes.h (AF_ScriptClassRec): Move relevant members
to...
(AF_WritingSystemClassRec): This new structure.  It holds pointers
to functions which can be shared among related scripts.
(AF_WritingSystem): New enumeration.
(AF_Script): Revised values using four-letter tags.
(AF_DEFINE_WRITING_SYSTEM_CLASS): New macro.
(AF_DEFINE_SCRIPT_CLASS): Updated.

* src/autofit/afglobal.c (af_writing_system_classes): New global,
constant array.
(af_script_classes): Updated.
(af_face_globals_free): Updated.
Remove assertion.
(af_face_globals_get_metrics): Updated.

* src/autofit/afglobal.h (AF_SCRIPT_FALLBACK)
[!AF_CONFIG_OPTION_CJK]: Handle this case.

* src/autofit/afloader.c (af_loader_load_g, af_loader_load_glyph):
Updated.

* src/autofit/afpic.c (autofit_module_class_pic_init): Updated;
initialize structures for both writing systems and scripts.
* src/autofit/afpic.h: Updated.
(AF_WRITING_SYSTEM_CLASSES_GET): New macro.

* src/autofit/afcjk.c (af_cjk_writing_system_class): New writing
system.
(af_cjk_uniranges): Renamed to...
(af_hani_uniranges): This.
(af_cjk_script_class): Reduced and renamed to...
(af_hani_script_class): This.
* src/autofit/afcjk.h: Updated.

* src/autofit/afdummy.c (af_dummy_writing_system_class): New writing
system.
(af_dummy_script_class): Reduced and renamed to...
(af_dflt_script_class): This.
* src/autofit/afdummy.h: Updated.

* src/autofit/afindic.c (af_indic_writing_system_class): New writing
system.
(af_indic_uniranges): Renamed to...
(af_deva_uniranges): This.
(af_indic_script_class): Reduced and renamed to...
(af_deva_script_class): This.
* src/autofit/afcjk.h: Updated.

* src/autofit/aflatin.c (af_latin_writing_system_class): New writing
system.
(af_latin_uniranges): Renamed to...
(af_latn_uniranges): This.
(af_latin_script_class): Reduced and renamed to...
(af_latn_script_class): This.
* src/autofit/aflatin.h: Updated.

* src/autofit/aflatin2.c (af_latin2_writing_system_class): New
writing system.
(af_latin2_uniranges): Renamed to...
(af_ltn2_uniranges): This.
Synchronize ranges with `latin'.
(af_latin2_script_class): Reduced and renamed to...
(af_ltn2_script_class): This.
* src/autofit/aflatin2.h: Updated.
Another round of cppcheck nitpicks.

The call was (from the top-level of the FreeType tree):

  cppcheck --force \
           --enable=all \
           -I /usr/include \
           -I /usr/local/include \
           -I /usr/lib/gcc/i586-suse-linux/4.7/include \
           -I include \
           -I include/freetype \
           -I include/freetype/config \
           -I include/freetype/internal \
           -DFT2_BUILD_LIBRARY \
           . &> cppcheck.log

using cppcheck git commit f7e93f99.

Note that cppcheck still can't handle `#include FOO' (with `FOO' a
macro).

*/* Improve variable scopes.
*/* Remove redundant initializations which get overwritten.

* src/gxvalid/*: Comment out redundant code or guard it with
FT_DEBUG_LEVEL_TRACE.
[autofit] Fix `make multi'.

* include/freetype/config/ftconfig.h (FT_LOCAL_ARRAY,
FT_LOCAL_ARRAY_DEF): New macros.

* src/autofit/afglobal.c (af_writing_system_classes,
af_script_classes): Use FT_LOCAL_ARRAY_DEF.
* src/autofit/afglobal.h: Declare `af_writing_system_classes' and
`af_script_classes'.
* src/autofit/afloader.c: Include `afpic.h'.
[sfnt] Fix compilation with g++.

* src/sfnt/pngshim.c (error_callback, read_data_from_FT_stream): Use
cast.
(Load_SBit_Png): Pacify compiler.
[autofit] Move declaration of writing systems into separate file.

This has the benefit that we don't need to duplicate the data at
different places.

* src/autofit/afwrtsys.h: New file.

* src/autofit/aftypes.h (AF_WritingSystem): Include `afwrtsys.h' to
define the enumeration values.

* src/autofit/afglobal.c: Include `afwrtsys.h' to get the writing
system specific header files.
Include `afpic.h'.
(af_writing_system_classes): Include `afwrtsys.h' to fill this
array.

* src/autofit/afpic.c: Include `afwrtsys.h' to get the writing
system specific header files.
(autofit_module_class_pic_init): Include `afwrtsys.h' for
initialization.
* src/autofit/afpic.h (AF_WRITING_SYSTEM_CLASSES_COUNT,
AF_WRITING_SYSTEM_CLASSES_REC_COUNT): Removed.  Use
`AF_WRITING_SYSTEM_MAX' instead.
[autofit] Move declaration of scripts into separate file.

This has the benefit that we don't need to duplicate the data at
different places.

* src/autofit/afscript.h: New file.

* src/autofit/aftypes.h (AF_Script): Include `afscript.h' to define
the enumeration values.

* src/autofit/afglobal.c: Include `afscript.h' to get the script
specific header files.
(af_script_classes): Include `afscript.h' to fill this array.

* src/autofit/afpic.c: Include `afscript.h' to get the script
specific header files.
(autofit_module_class_pic_init): Include `afscript.h' for
initialization.
* src/autofit/afpic.h (AF_SCRIPT_CLASSES_COUNT,
AF_SCRIPT_CLASSES_REC_COUNT): Removed.  Use `AF_SCRIPT_MAX' instead.

* src/autofit/rules.mk (AUTOF_DRV_H): Updated.
Typo.
* include/freetype/ftcffdrv.h: Improve documentation.
This is based on blog entries from David Lemon and Dave Arnold (both
from Adobe) with kind permission.  Dave also helped in
proof-reading.
[autofit] Update comments.
Add comments to `ft_corner_is_flat'.
Comment typo.
[autofit] Improve handling of `near' points.

Points which are very near to each other are now marked as such.
The `weak' flag is then computed by using the `in' vector of the
first and the `out' vector of the last point of a group of near
points.

For example, this fixes the rendering of glyph `Oslash' in
`Roboto-Thin.ttf'.

* src/autofit/afhints.h (AF_Flags): New value `AF_FLAGS_NEAR'.

* src/autofit/afhints.c (af_glyph_hints_reload): Introduce
the heuristic value `near_limit' to decide whether the current point
is near to the previous one, then set `AF_FLAG_NEAR' accordingly.
Store good `in' vector (of last non-near point) in
`last_good_in_{x,y}' and use it as an argument to
`ft_corner_is_flat' if necessary.
Whitespace.
Fix Savannah bug #39700.

* builds/unix/ftconfig.h: Synchronize with
`include/freetype/config/ftconfig.h'.

* builds/vms/ftconfig.h: Ditto.
Make the differences to the master `ftconfig.h' file as small as
possible for easier maintainance.
Fix gcc pragmas.

* src/truetype/ttinterp.c (TT_MulFix14_long_long,
TT_DotFix14_long_long): Older gcc versions don't accept diagnostic
pragmas within a function body.
Fix gcc pragmas, part 2.

* src/truetype/ttinterp.c (TT_MulFix14_long_long,
TT_DotFix14_long_long): `#pragma gcc diagnostic {push,pop}' has been
introduced with gcc version 4.6.
Fix Savannah bug #39702.

* src/cff/cffload.c (cff_index_get_pointers): Check for `cur_offset
!= 0'; this stronger test is mandated by the CFF specification.
Fix test for INDEX structures which have one or more empty entries
at the end.
[base] Refactor experimental (disabled) BBox_Cubic_Check.

* src/base/ftbbox.c (BBox_Cubic_Check): Implement the minimum search
as the mirror image of the maximum search.