"SfR Fresh" - the SfR Freeware/Shareware Archive

Member "freetype-2.3.7/src/pcf/README" of archive freetype-2.3.7.tar.gz:

    1                   FreeType font driver for PCF fonts
    2 
    3                        Francesco Zappa Nardelli
    4                   <francesco.zappa.nardelli@ens.fr>
    5 
    6 
    7 Introduction
    8 ************
    9 
   10 PCF (Portable Compiled Format) is a binary bitmap font format, largely used
   11 in X world. This code implements a PCF driver for the FreeType library.
   12 Glyph images are loaded into memory only on demand, thus leading to a small
   13 memory footprint.
   14 
   15 Information on the PCF font format can only be worked out from
   16 `pcfread.c', and `pcfwrite.c', to be found, for instance, in the XFree86
   17 (www.xfree86.org) source tree (xc/lib/font/bitmap/).
   18 
   19 Many good bitmap fonts in bdf format come with XFree86: they can be
   20 compiled into the pcf format using the `bdftopcf' utility.
   21 
   22 
   23 Supported hardware
   24 ******************
   25 
   26 The driver has been tested on linux/x86 and sunos5.5/sparc.  In both
   27 cases the compiler was gcc.  When back in Paris, I will test it also
   28 on linux/alpha.
   29 
   30 
   31 Encodings
   32 *********
   33 
   34 The variety of encodings that accompanies pcf fonts appears to encompass the
   35 small set defined in freetype.h.  On the other hand, each pcf font defines
   36 two properties that specify encoding and registry.
   37 
   38 I decided to make these two properties directly accessible, leaving to the
   39 client application the work of interpreting them.  For instance:
   40 
   41   #include "pcftypes.h"  /* include/freetype/internal/pcftypes.h */
   42 
   43   FT_Face     face;
   44   PCF_Public_Face  pcfface;
   45 
   46   FT_New_Face( library,..., &face );
   47 
   48   pcfface = (PCF_Public_Face)face;
   49 
   50   if ((pcfface->charset_registry == "ISO10646") &&
   51         (pcfface->charset_encoding) == "1")) [..]
   52 
   53 Thus the driver always export `ft_encoding_none' as
   54 face->charmap.encoding.  FT_Get_Char_Index() behavior is unmodified, that
   55 is, it converts the ULong value given as argument into the corresponding
   56 glyph number.
   57 
   58 
   59 Known problems
   60 **************
   61 
   62 - dealing explicitly with encodings breaks the uniformity of freetype2
   63   api.
   64 
   65 - except for encodings properties, client applications have no
   66   visibility of the PCF_Face object.  This means that applications
   67   cannot directly access font tables and are obliged to trust
   68   FreeType.
   69 
   70 - currently, glyph names and ink_metrics are ignored.
   71 
   72 I plan to give full visibility of the PCF_Face object in the next
   73 release of the driver, thus implementing also glyph names and
   74 ink_metrics.
   75 
   76 - height is defined as (ascent - descent).  Is this correct?
   77 
   78 - if unable to read size information from the font, PCF_Init_Face
   79   sets available_size->width and available_size->height to 12.
   80 
   81 - too many english grammar errors in the readme file :-(
   82 
   83 
   84 License
   85 *******
   86 
   87 Copyright (C) 2000 by Francesco Zappa Nardelli
   88 
   89 Permission is hereby granted, free of charge, to any person obtaining
   90 a copy of this software and associated documentation files (the
   91 "Software"), to deal in the Software without restriction, including
   92 without limitation the rights to use, copy, modify, merge, publish,
   93 distribute, sublicense, and/or sell copies of the Software, and to
   94 permit persons to whom the Software is furnished to do so, subject to
   95 the following conditions:
   96 
   97 The above copyright notice and this permission notice shall be
   98 included in all copies or substantial portions of the Software.
   99 
  100 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  101 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  102 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  103 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  104 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  105 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  106 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  107 
  108 
  109 Credits
  110 *******
  111 
  112 Keith Packard wrote the pcf driver found in XFree86.  His work is at
  113 the same time the specification and the sample implementation of the
  114 PCF format.  Undoubtedly, this driver is inspired from his work.