Commit Graph

24 Commits

Author SHA1 Message Date
Alexei Podtelezhnikov a692170a23 Call it fixed-point. 2013-01-12 19:17:05 -05:00
Werner Lemberg 8be5d3ac0d Improve documentation w.r.t. stroking and advance widths.
Based on suggestions from johnpf74 <jfalcone@ea.com>.
2012-05-24 07:05:03 +02:00
suzuki toshiya 1749d8bc6a Remove trailing spaces. 2012-01-17 02:00:24 +09:00
David Bevan aecbfe1ba7 [ftstroke] Major revision.
The main problems
-----------------

  o If FT_STROKER_LINEJOIN_BEVEL was specified, unlimited miter
    joins (not bevel joins) were generated.  Indeed, the meanings of
    `miter' and `bevel' were incorrectly reversed (consistently) in
    both the code and comments.

  o The way bevel joins were constructed (whether specified
    explicitly, or created as a result of exceeding the miter limit)
    did not match what is required for stroked text in PostScript or
    PDF.

The main fixes
--------------

  o The behaviour of FT_STROKER_LINEJOIN_BEVEL has been corrected.

  o A new line join style, FT_STROKER_LINEJOIN_MITER_FIXED, has been
    introduced to support PostScript and PDF miter joins.

  o FT_STROKER_LINEJOIN_MITER_VARIABLE has been introduced as an
    alias for FT_STROKER_LINEJOIN_MITER.

Additionally, a variety of stroking errors have been fixed.  These
would cause various artifacts (including points `at infinity'),
especially when stroking poor quality fonts.

See

  http://lists.gnu.org/archive/html/freetype-devel/2011-07/msg00001.html

for example documents.  The FreeType stroker now produces results
very similar to that produced by GhostScript and Distiller for these
fonts.

Other problems
--------------

The following problems have been resolved:

  o Inside corners could be generated incorrectly.  Intersecting the
    inside corner could cause a missing triangular area and other
    effects.

    The intersection point can only be used if the join is between
    two lines and both lines are long enough.  The `optimization'
    condition in `ft_stroker_inside' has been corrected; this
    requires the line length to be passed into various functions and
    stored in `FT_StrokerRec'.

  o Incorrect cubic curves could be generated.  The angle
    calculations in `FT_Stroker_CubicTo' have been corrected to
    handle the case of the curve crossing the +/-PI direction.

  o If the border radius was greater than the radius of curvature of
    a curve, then the negative sector would end up outside (not
    inside) the border.  This situation is now recognized and the
    negative sector is circumnavigated in the opposite direction.
    (If round line joins are being used, this code is disabled
    because the line join will always cover the negative sector.)

  o When a curve is split, the arcs may not join smoothly (especially
    if the curve turns sharply back on itself).  Changes in
    direction between adjacent arcs were not handled.  A round
    corner is now added if the deviation from one arc to the next is
    greater than a suitable threshold.

  o The current direction wasn't retained if a the outline contained
    a zero length lineto or a curve that was determined to be
    `basically a point'.  This could cause a spurious join to be
    added.

  o Cubics with close control points could be mishandled.  All eight
    cases are now distinguished correctly.

Other improvements
------------------

o Borders for cubic curves could be too `flat'.
  FT_SMALL_CUBIC_THRESHOLD has been reduced a little to prevent
  this.

o The handling and use of movable points has been simplified a
  little.

o Various values are now computed only if the results are actually
  needed.

o The directions of the outer and inner borders have been swapped,
  as recommended by Graham Asher.

* src/base/ftstroke.c: Revised.
* include/freetype/ftstroke.h: Updated.
2011-07-02 12:09:52 +02:00
Werner Lemberg dc20faaf4c Typo. 2009-07-17 10:50:04 +02:00
Werner Lemberg 59e2c8dd25 Fix documentation of FT_Outline_GetInsideBorder.
* include/freetype/ftstroke.h (FT_Outline_GetInsideBorder): Fix
documentation.  Problem reported by Truc Truong <tructv@necsv.com>.

* docs/CHANGES: Updated.
2009-01-18 06:42:59 +00:00
Werner Lemberg 634df6e3ba * src/cff/cffgload.h, src/cff/cffgload.c
(cff_decoder_set_width_only): Eliminate function call.
2008-09-16 07:25:31 +00:00
Werner Lemberg 8a9b63913f Improve navigation in API reference.
* src/tools/docmaker/tohtml.py (html_header_3): Renamed to...
(html_header_6): This.
(html_header_3, html_header_3i, html_header_4, html_header_5,
html_header_5t): New strings.
(toc_footer_start, toc_footer_end): New strings.
(HtmlFormatter::html_header): Updated.
(HtmlFormatter::html_index_header, HtmlFormatter::html_toc_header):
New strings.
(HtmlFormatter::index_enter): Use `html_index_header'.
(HtmlFormatter::index_exit): Print `html_footer'.
(HtmlFormatter::toc_enter): Use `html_toc_header'.
(HtmlFormatter::toc_exit): Print proper footer.

Convert ~ to non-breakable space.

* src/tools/docmaker/tohtml.py (make_html_para): Implement it.
Update header files accordingly.

Many other minor documentation fixes.
2008-06-26 19:56:51 +00:00
Werner Lemberg 2b0b4221ab Cosmetic code changes. 2008-05-28 22:17:28 +00:00
Werner Lemberg f6c120f826 * docs/CHANGES: Document FT_Face_CheckTrueTypePatents).
Formatting, reformulations.
2007-06-11 04:55:58 +00:00
Werner Lemberg e12a471f6a * src/tools/docmaker/tohtml.py (html_header_1): Use `utf-8' charset.
Convert some files to UTF-8.
2006-05-12 14:20:43 +00:00
Werner Lemberg 2ee71f1f01 More minor fixes. Move `version' section to the end of freetype.h so that
the library compiles actually.
2006-05-12 13:55:04 +00:00
Werner Lemberg 8a8c6022bf Formatting, copyright years, documentation. 2006-04-22 12:24:52 +00:00
David Turner 7dc7f21533 doc updates
- fixing FT_Stroker_New to use a FT_Library instead of a FT_Memory

i know, i know, the ChangeLog will be updated later
2006-04-13 16:31:02 +00:00
Werner Lemberg d6e2498f74 * src/tools/docmaker/tohtml.py (make_html_para): Convert `...' quotations
into real left and right single quotes.
Use `para_header' and `para_footer'.

* src/tools/docmaker/sources.py (re_bold, re_italic): Accept "'" also.
2006-03-24 18:31:47 +00:00
Werner Lemberg 9d3de385a6 Fix comment style. 2005-10-26 20:08:45 +00:00
Werner Lemberg ee95b6f0d4 Adding OpenType validation module. The code is based on the
(unfinished) `otlayout' module but has been heavily modified to make
it much more compact.

* src/otvalid/*: New module.

* include/freetype/ftotval.h, src/base/ftotval.c,
include/freetype/internal/services/svotval.h: New files.

* include/freetype/config/ftmodule.h: Add otv_module_class.
* include/freetype/config/ftheader.h (FT_OPENTYPE_VALIDATE_H): New
macro.
* include/freetype/internal/ftserv.h
(FT_SERVICE_OPENTYPE_VALIDATE_H): New macro.
* include/freetype/internal/fttrace.h (otvmodule, otvcommon,
otvbase, otvgdef, otvgpos, otvgsub, otvjstf): New trace components.

* include/freetype/ftchapters.h: Updated.

* src/base/Jamfile (Library), src/base/descrip.mms (OBJS),
src/base/rules.mk (BASE_EXT_SRC): Updated.

* docs/CHANGES: Updated.
2004-09-10 14:39:00 +00:00
Werner Lemberg 43f0e26c8e * docs/CHANGES: Updated.
* src/base/ftstroke.c (FT_Stroker_ParseOutline): Fix compiler
warning.
2004-07-17 16:45:21 +00:00
David Turner 9f67a45dbe * include/freetype/ftstroke.h: updating documentation comments.
I hereby declare the stroker as OFFICIAL !
2004-07-15 21:13:54 +00:00
Werner Lemberg 6cda9c489d * include/freetype/ftcache.h: Delete duplicated definition of
FTC_FaceID.

* src/cff/cffdrivr.c (cff_get_cmap_info): Call sfnt module's TT CMap
Info service function if the cmap comes from sfnt.  Return 0 if the
cmap is sythesized in cff module.

Formatting; updating copyright.
2004-01-22 09:07:12 +00:00
David Turner fa0346d6d9 * src/base/ftstroke.c, include/freetype/ftstroke.h: fixing bugs and
adding FT_Glyph_Stroke and FT_Glyph_StrokerBorder APIs
2004-01-16 08:57:05 +00:00
Werner Lemberg 80cfbd7073 * src/base/fttrigon.c, src/base/ftgloadr.c: Inlude
FT_INTERNAL_OBJECTS_H.

* src/base/ftstroke.c (FT_Outline_GetInsideBorder,
FT_Outline_GetOutsideBorder): s/or/o/ to make it compile with
C++ compilers.

* src/cache/ftcmru.c, include/freetype/cache/ftcmru.h:
s/select/selection/ to avoid compiler warning.
* src/cff/cffload.h: s/select/ftselect/ to avoid potential
compiler warning.

Formatting.
2003-12-26 07:26:08 +00:00
David Turner 57ecae22a7 new version of the cache sub-system - still under debugging 2003-12-19 21:23:58 +00:00
Werner Lemberg 499053c1c5 * include/freetype/ftstroker.h: Renamed to...
* include/freetype/ftstroke.h: This.

* src/base/ftstroker.c: Renamed to...
* src/base/ftstroke.c: This.

* include/freetype/config/ftheader.h (FT_STROKER_H): Updated.

* src/base/descrip.mms, src/base/Jamfile, src/base/rules.mk:
Updated.

* src/pcf/pcfdriver.c: Renamed to...
* src/pcf/pcfdrivr.c: This.
* src/pcf/pcfdriver.h: Renamed to...
* src/pcf/pcfdrivr.h: This.

* src/pcf/Jamfile, src/pcf/rules.mk: Updated.
2003-06-07 04:02:21 +00:00