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README

      1                   FreeType font driver for PCF fonts
      2 
      3                        Francesco Zappa Nardelli
      4                   <francesco.zappa.nardelli (a] 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 Use `FT_Get_BDF_Charset_ID' to access the encoding and registry.
     35 
     36 The driver always exports `ft_encoding_none' as face->charmap.encoding.
     37 FT_Get_Char_Index() behavior is unmodified, that is, it converts the ULong
     38 value given as argument into the corresponding glyph number.
     39 
     40 
     41 Known problems
     42 **************
     43 
     44 - dealing explicitly with encodings breaks the uniformity of FreeType 2
     45   API.
     46 
     47 - except for encodings properties, client applications have no
     48   visibility of the PCF_Face object.  This means that applications
     49   cannot directly access font tables and are obliged to trust
     50   FreeType.
     51 
     52 - currently, glyph names and ink_metrics are ignored.
     53 
     54 I plan to give full visibility of the PCF_Face object in the next
     55 release of the driver, thus implementing also glyph names and
     56 ink_metrics.
     57 
     58 - height is defined as (ascent - descent).  Is this correct?
     59 
     60 - if unable to read size information from the font, PCF_Init_Face
     61   sets available_size->width and available_size->height to 12.
     62 
     63 - too many english grammar errors in the readme file :-(
     64 
     65 
     66 License
     67 *******
     68 
     69 Copyright (C) 2000 by Francesco Zappa Nardelli
     70 
     71 Permission is hereby granted, free of charge, to any person obtaining
     72 a copy of this software and associated documentation files (the
     73 "Software"), to deal in the Software without restriction, including
     74 without limitation the rights to use, copy, modify, merge, publish,
     75 distribute, sublicense, and/or sell copies of the Software, and to
     76 permit persons to whom the Software is furnished to do so, subject to
     77 the following conditions:
     78 
     79 The above copyright notice and this permission notice shall be
     80 included in all copies or substantial portions of the Software.
     81 
     82 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     83 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     84 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     85 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
     86 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     87 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     88 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     89 
     90 
     91 Credits
     92 *******
     93 
     94 Keith Packard wrote the pcf driver found in XFree86.  His work is at
     95 the same time the specification and the sample implementation of the
     96 PCF format.  Undoubtedly, this driver is inspired from his work.
     97