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Skef Iterum 8eab511017 [CFF] Extract BlueValues as Fixed rather than Int. 
This is a follow-up to commit 26a7f047,

  [cff] Make blend operator work with floats in private dicts.

which addressed the 'party baseline' bug.  However, the reporting user
indicated that the default location and some other points in design space
rendered OK, but other points in design space still had problems.  The most
obvious issue being that the x-heights of lower-case letters did not align;
see

  https://github.com/adobe-fonts/source-serif/issues/121#issuecomment-1773794136

After some analysis we determined that this was due to an interaction
between `BlueValue` rounding and the zone-based algorithm.  In short, for a
point to be considered in a zone it must fall within the bounds of the zone.
(There is a slop factor in some cases, but only a very small one.)  In the
Adobe-contributed side of the code, point values are not integer-rounded,
instead they're kept as (some form of) fixed.  Rounding just the `BlueValues`
means that points that need to be considered within a zone will fall outside
of it at some points in design space.

The majority of this patch changes the storage and parsing of `BlueValues`
to keep them as `FT_Fixed`.  No significant code changes were needed because
the values are converted to `Fixed` anyway when stored in `CF_BlueRec`.  No
attempt was made to address problems in the older pshinter code beyond
converting the values from `FT_Fixed` to `FT_Short` when copying the private
dictionary.  (However, as the point values are also rounded in that code,
the problem is much less likely to occur, although inconsistency between
rounding and truncation could cause an analogous problem.)

* include/freetype/internal/cfftypes.h (CFF_PrivateRec): Use `FT_Fixed` for
`blue_values`, `other_blues`, `family_blues`, and `family_other_blues`.

* src/cff/cffload.c (cff_blend_doBlend): Updated.

* src/cff/cffobjs.c (CFF_fixedToInt): New macro.
(cff_make_private_dict): Use it.

* src/cff/cffparse.h (cff_kind_delta_fixed): New enum value.

* src/cff/cffparse.c (do_fixed): Updated.
(CFF_FIELD_DELTA, CFF_FIELD_DELTA_FIXED, CFF_DELTA_KIND): New set of macros,
replacing `CFF_FIELD_DELTA`.
(cff_parser_run): Updated to handle fixed-float deltas.

* src/cff/cfftoken.h: Updated to use `CFF_FIELD_DELTA_FIXED` for blue
values.

* src/psaux/psblues.c (cf2_blueToFixed): Removed, no longer needed.
(cf2_blues_init): Updated.

* src/pxaux/psft.c, src/pxaux/psft.h (cf2_getBlueValues, cf2_getOtherBlues,
cf2_getFamilyBlues, cf2_getFamilyOtherBlues): Updated signatures.

* src/psaux/psobjs.c (t1_make_subfont): Updated.
2023-12-14 07:17:01 +01:00
builds [msbuild] Streamline the process. 2023-12-06 23:33:32 -05:00
devel [truetype] Hide Infinality. 2023-02-17 04:22:24 +00:00
docs [msbuild] Streamline the process. 2023-12-06 23:33:32 -05:00
include [CFF] Extract BlueValues as Fixed rather than Int. 2023-12-14 07:17:01 +01:00
objs * builds/windows/vc2010/freetype.vcxproj: AfterBuild copy. 2017-12-16 22:00:40 -05:00
src [CFF] Extract BlueValues as Fixed rather than Int. 2023-12-14 07:17:01 +01:00
subprojects * subprojects/*.wrap: Updated. 2023-08-24 20:47:00 +02:00
tests * tests/issue-1063/main.c: s/PATH_MAX/FILENAME_MAX/. 2021-10-20 11:27:03 -04:00
.clang-format Add .clang-format file 2020-07-16 15:51:06 +02:00
.gitignore [meson] Add first regression test to FreeType 2021-06-16 10:28:47 +02:00
.gitlab-ci.yml * Version 2.13.1 released. 2023-06-24 08:11:05 +02:00
.gitmodules Move 'dlg' submodule to subprojects directory. 2021-02-16 14:07:18 +01:00
.mailmap .mailmap: Updated. 2023-05-13 09:35:12 +02:00
autogen.sh [builds] Abbreviate the DLG submodule update. 2023-08-30 02:28:48 +00:00
CMakeLists.txt * Version 2.13.2 released. 2023-08-25 20:12:52 +02:00
configure * configure: Use sed instead of grep. 2023-03-02 20:53:21 +00:00
LICENSE.TXT [autofit] Don't depend on 'hb-ft'. 2023-01-06 12:54:17 +01:00
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modules.cfg Update all copyright notices. 2023-01-17 09:18:25 +01:00
MSBuild.rsp [msbuild] Streamline the process. 2023-12-06 23:33:32 -05:00
MSBuild.sln [msbuild] Streamline the process. 2023-12-06 23:33:32 -05:00
README * Version 2.13.2 released. 2023-08-25 20:12:52 +02:00
README.git Update all copyright notices. 2023-01-17 09:18:25 +01:00
vms_make.com * vms_make.com: Switch to clang. 2023-12-14 06:21:52 +01:00

README 

FreeType 2.13.2
===============

Homepage: https://www.freetype.org

FreeType is a freely available software library to render fonts.

It  is  written  in  C,   designed  to  be  small,  efficient,  highly
customizable,  and portable  while capable  of producing  high-quality
output (glyph images) of most vector and bitmap font formats.

Please   read  the   `docs/CHANGES`   file,   it  contains   IMPORTANT
INFORMATION.

Read the files `docs/INSTALL*`  for installation instructions; see the
file `docs/LICENSE.TXT` for the available licenses.

For using FreeType's git repository  instead of a distribution bundle,
please read file  `README.git`.  Note that you have  to actually clone
the repository; using a snapshot will  not work (in other words, don't
use gitlab's 'Download' button).

The FreeType 2 API reference is located in directory `docs/reference`;
use the file  `index.html` as the top entry point.   [Please note that
currently  the search  function  for  locally installed  documentation
doesn't work due to cross-site scripting issues.]

Additional documentation is  available as a separate  package from our
sites.  Go to

  https://download.savannah.gnu.org/releases/freetype/

and download one of the following files.

  freetype-doc-2.13.2.tar.xz
  freetype-doc-2.13.2.tar.gz
  ftdoc2132.zip

To view the documentation online, go to

  https://www.freetype.org/freetype2/docs/


Mailing Lists
-------------

The preferred  way of  communication with the  FreeType team  is using
e-mail lists.

  general use and discussion:      freetype@nongnu.org
  engine internals, porting, etc.: freetype-devel@nongnu.org
  announcements:                   freetype-announce@nongnu.org
  git repository tracker:          freetype-commit@nongnu.org

The lists are moderated; see

  https://www.freetype.org/contact.html

how to subscribe.


Bugs
----

Please submit bug reports at

  https://gitlab.freedesktop.org/freetype/freetype/-/issues

Alternatively,    you    might    report    bugs    by    e-mail    to
`freetype-devel@nongnu.org`.    Don't  forget   to  send   a  detailed
explanation of the problem -- there  is nothing worse than receiving a
terse message that only says 'it doesn't work'.


Patches
-------

For larger changes please provide merge requests at

  https://gitlab.freedesktop.org/freetype/freetype/-/merge_requests

Alternatively, you can send patches to the `freetype-devel@nongnu.org`
mailing list  -- and thank you  in advance for your  work on improving
FreeType!

Details on the process can be found here:

  https://www.freetype.org/developer.html#patches


Enjoy!

  The FreeType Team

----------------------------------------------------------------------

Copyright (C) 2006-2023 by
David Turner, Robert Wilhelm, and Werner Lemberg.

This  file is  part of  the FreeType  project, and  may only  be used,
modified,  and distributed  under the  terms of  the  FreeType project
license,  LICENSE.TXT.  By  continuing to  use, modify,  or distribute
this file you  indicate that you have read  the license and understand
and accept it fully.


--- end of README ---