misc/libfreetype/src/pcf/README
changeset 9431 0f5961910e27
parent 9357 a501f5ec7b34
parent 9429 7a97a554ac80
child 9433 f0a8ac191839
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9357:a501f5ec7b34 9431:0f5961910e27
     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 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 freetype2
       
    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.