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3918 Serge 1 
FreeType font driver for PCF fonts
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                       Francesco Zappa Nardelli
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Introduction
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************
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PCF (Portable Compiled Format) is a binary bitmap font format, largely used
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in X world. This code implements a PCF driver for the FreeType library.
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Glyph images are loaded into memory only on demand, thus leading to a small
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memory footprint.
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Information on the PCF font format can only be worked out from
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`pcfread.c', and `pcfwrite.c', to be found, for instance, in the XFree86
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(www.xfree86.org) source tree (xc/lib/font/bitmap/).
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Many good bitmap fonts in bdf format come with XFree86: they can be
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compiled into the pcf format using the `bdftopcf' utility.
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Supported hardware
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******************
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The driver has been tested on linux/x86 and sunos5.5/sparc.  In both
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cases the compiler was gcc.  When back in Paris, I will test it also
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on linux/alpha.
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Encodings
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*********
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Use `FT_Get_BDF_Charset_ID' to access the encoding and registry.
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The driver always exports `ft_encoding_none' as face->charmap.encoding.
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FT_Get_Char_Index() behavior is unmodified, that is, it converts the ULong
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value given as argument into the corresponding glyph number.
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Known problems
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**************
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- dealing explicitly with encodings breaks the uniformity of freetype2
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  api.
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- except for encodings properties, client applications have no
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  visibility of the PCF_Face object.  This means that applications
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  cannot directly access font tables and are obliged to trust
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  FreeType.
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- currently, glyph names and ink_metrics are ignored.
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I plan to give full visibility of the PCF_Face object in the next
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release of the driver, thus implementing also glyph names and
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ink_metrics.
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- height is defined as (ascent - descent).  Is this correct?
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- if unable to read size information from the font, PCF_Init_Face
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  sets available_size->width and available_size->height to 12.
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- too many english grammar errors in the readme file :-(
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License
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*******
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Copyright (C) 2000 by Francesco Zappa Nardelli
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Credits
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*******
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Keith Packard wrote the pcf driver found in XFree86.  His work is at
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the same time the specification and the sample implementation of the
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PCF format.  Undoubtedly, this driver is inspired from his work.