kc3-lang/freetype

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Hash : a632fb54
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Date : 2018-06-24T15:22:10

[truetype] Increase precision while applying VF deltas.

It turned out that we incorrectly round CVT and glyph point deltas
before accumulation, leading to severe positioning errors if there
are many delta values to sum up.

Problem reported by Akiem Helmling <akiem@underware.nl> and analyzed
by Behdad.

* src/truetype/ttgxvar.c (ft_var_readpackeddelta): Return deltas in
16.16 format.
(tt_face_var_cvt): Collect deltas in `cvt_deltas', which is a 16.16
format array, and add the accumulated values to the CVT at the end
of the function.
(TT_Vary_Apply_Glyph_Deltas): Store data in `points_org' and
`points_out' in 16.16 format.
Collect deltas in `point_deltas_x' and `point_deltas_y', which are
16.16 format arrays, and add the accumulated values to the glyph
coordinates at the end of the function.

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README

  FreeType 2.9.1
  ==============

  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.

  The FreeType 2 API reference is located in `docs/reference'; use the
  file   `ft2-toc.html'   as   the   top  entry   point.    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-2.9.1.tar.bz2
    freetype-doc-2.9.1.tar.gz
    ftdoc291.zip

  To view the documentation online, go to

    https://www.freetype.org/freetype2/documentation.html


  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://savannah.nongnu.org/bugs/?group=freetype

  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'.


  Enjoy!


    The FreeType Team

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

Copyright 2006-2018 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 ---

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