Implementing a True Type grid fitting, step 12, final.

[Log message beg]
Implementing a True Type grid fitting, step 12, final.

DETAILS :

This patch switches on the new grid fitter,
and provides related changes to the documentation.

EXPECTED DIFFERENCES :

All True type fonts render differently.
They present in the following tests :

01_001.pdf
159.pdf
adesso2.pdf
adesso7.pdf
adesso8.pdf
Altona.Page_3.2002-09-27.pdf
annots.pdf
budget2.pdf
budget2_ai87.pdf
bugsample.pdf
Faktura.pdf
fonts.pdf
ICPconcept.pdf
keyboard.pdf
MagicEye.pdf
ngnews.pdf
ngnews1.pdf
S2_Digitalproof-Forum_x3k.pdf
test_multipage_prob.pdf
Testform.v1.0.2.pdf
xngnews.pdf
japan.ps
japan-.ps
korea.ps
MyTest5.ps
MyTest6.ps
Type11CDevProc.ps
type42_glyph_index.ps

[Log message end]

Changes:



*** f:\casper\HEAD\gs\src\gx.h Tue Dec 30 14:50:11 2003
--- files\gs\src\gx.h Thu Jan  1 13:40:53 2004
***************
*** 31,35 ****
  /* Users should not modify them. */
  #define NEW_TT_INTERPRETER 1
! #define TT_GRID_FITTING (NEW_TT_INTERPRETER && 0) /* old code = 0, new
code = 1. */
  #define CURVED_TRAPEZOID_FILL 1 /* old code = 0, new code = 1. */
  /* The following switches are only important with CURVED_TRAPEZOID_FILL 1.
*/
--- 31,35 ----
  /* Users should not modify them. */
  #define NEW_TT_INTERPRETER 1
! #define TT_GRID_FITTING (NEW_TT_INTERPRETER && 1) /* old code = 0, new
code = 1. */
  #define CURVED_TRAPEZOID_FILL 1 /* old code = 0, new code = 1. */
  /* The following switches are only important with CURVED_TRAPEZOID_FILL 1.
*/


*** f:\casper\HEAD\gs\doc\Language.htm Thu Jan  1 13:37:03 2004
--- files\gs\doc\Language.htm Wed Jan  7 17:15:41 2004
***************
*** 2001,2017 ****
  not covered by Apple's patents. This allows the Dynalab fonts to
  rasterize properly.
! Fonts with patented instructions can't be properly grid fitted.
! This parameter controls the action of the reduced interpreter:
! a value of 0 disables grid fitting for all fonts;
! a value of 1 enables the grid fitting for glyphs that don't involve
! patented instructions.
! When set to 1 a warning is printed to stderr when a patented
! instruction is encountered, and the glyph is rendered ignoring the
! entire grid fitting program. This parameter defaults to 0, but this
  may be overridden on the command line with
! <b><tt>-dGridFitTT=1</tt></b>.
  <p>
  The bytecode interpreter is based in part of the work of the
  <a href="http://freetype.org/">Freetype</a> Team.
  </dl>

--- 2001,2043 ----
  not covered by Apple's patents. This allows the Dynalab fonts to
  rasterize properly.
! <p>
! The reduced interpreter can't properly grid fit
! fonts with patented instructions. Therefore Ghostscript implements
! another grid fitter for True Types, based on a spot topology analyzis.
! <p>
! This parameter controls the action of the reduced interpreter and the grid
fitter :
!
! <li>
! A value of 0 disables grid fitting for all True Type fonts. It is a
backward compatibility mode.
! </li>
!
! <li>
! A value of 1 enables the grid fitting for glyphs that don't involve
! patented instructions, using the reduced True Type bytecode interpreter.
! When a patented instruction is encountered, a warning is printed to
stderr,
! and the glyph is rendered ignoring the
! entire grid fitting program.
! </li>
!
! <li>
! A value of 2 envolves the topological grid fitter. This value is
recommended
! for common use.
! </li>
!
! <li>
! A value of 3 specifies that the bytecode interpreter to be used
! to grid fit glyphs that have no patented instructions,
! and other glyphs are grid fitted topologically. This mode may
! improve the rendering of some fonts, but in general the best result
! is not guaranteed.
! </li>
! <p>
! This parameter defaults to 2, but this
  may be overridden on the command line with
! <b><tt>-dGridFitTT=n</tt></b>.
  <p>
  The bytecode interpreter is based in part of the work of the
  <a href="http://freetype.org/">Freetype</a> Team.
+ The topological grid fitting is a new original Ghostscript method.
  </dl>




*** f:\casper\HEAD\gs\doc\News.htm Tue Jan  6 08:30:41 2004
--- files\gs\doc\News.htm Wed Jan  7 17:38:52 2004
***************
*** 61,64 ****
--- 61,69 ----
  This is an unreleased development source version.

+ <p>
+ A new feature in this version is <b><tt>a topological grid
fitting</b></tt>,
+ originally developed for Ghostscript by Dr. I. Melichev. It significantly
improves
+ the rendering of True Type fonts at small resolutions.
+
  <p>
  The following <a href="http://bugs.ghostscript.com/">bug</a> numbers were
open at



*** f:\casper\HEAD\gs\doc\Use.htm Tue Dec  9 02:17:16 2003
--- files\gs\doc\Use.htm Wed Jan  7 17:31:41 2004
***************
*** 1826,1845 ****
  <dt><b><tt>-dGridFitTT=</tt></b><em>n</em>
  <dd> This specifies the initial value for the implementation specific
! user parameter <b><tt>GridFitTT</tt></b>.
  It controls a grid fitting of True Type fonts
  (Some people call it "hinting", but stronly speaking
  the latter is a Type 1 feature).
! Setting this to 1 enables grid fitting for True Type glyphs
! that don't involve patented instructions. The value 0 disables grid
! fitting for all True Type fonts. The default value is 0.

- <p>
- Setting <b><tt>-dGridFitTT=1</tt></b> may improve rendering
- of True Type fonts. In particular, some fonts rely on the grid fitting
- instructions for proper rasterization.
- Ghostscript only supports the freely-implementable subset of grid
- fitting instructions. If a patented instruction is encountered, a
- warning is printed to <tt>stderr</tt> and the glyph is rendered with no
- grid fitting.
  </dl>

--- 1826,1838 ----
  <dt><b><tt>-dGridFitTT=</tt></b><em>n</em>
  <dd> This specifies the initial value for the implementation specific
! user parameter <a href="Language.htm#User_parameters">GridFitTT</a>
  It controls a grid fitting of True Type fonts
  (Some people call it "hinting", but stronly speaking
  the latter is a Type 1 feature).
! Setting this to 2 enables grid fitting for True Type glyphs.
! The value 0 disables grid fitting. The default value is 2.
! For more information see the description of the user parameter
! <a href="Language.htm#User_parameters">GridFitTT</a>.

  </dl>