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+                  FreeType font driver for PCF fonts
+
+                       Francesco Zappa Nardelli
+                  <francesco.zappa.nardelli@ens.fr>
+
+
+Introduction
+************
+
+PCF (Portable Compiled Format) is a binary bitmap font format, largely used
+in X world. This code implements a PCF driver for the FreeType library.
+Glyph images are loaded into memory only on demand, thus leading to a small
+memory footprint.
+
+Information on the PCF font format can only be worked out from
+`pcfread.c', and `pcfwrite.c', to be found, for instance, in the XFree86
+(www.xfree86.org) source tree (xc/lib/font/bitmap/).
+
+Many good bitmap fonts in bdf format come with XFree86: they can be
+compiled into the pcf format using the `bdftopcf' utility.
+
+
+Supported hardware
+******************
+
+The driver has been tested on linux/x86 and sunos5.5/sparc.  In both
+cases the compiler was gcc.  When back in Paris, I will test it also
+on linux/alpha.
+
+
+Encodings
+*********
+
+The variety of encodings that accompanies pcf fonts appears to encompass the
+small set defined in freetype.h.  On the other hand, each pcf font defines
+two properties that specify encoding and registry.
+
+I decided to make these two properties directly accessible, leaving to the
+client application the work of interpreting them.  For instance:
+
+  #include "pcftypes.h"  /* include/freetype/internal/pcftypes.h */
+
+  FT_Face     face;
+  PCF_Public_Face  pcfface;
+
+  FT_New_Face( library,..., &face );
+
+  pcfface = (PCF_Public_Face)face;
+
+  if ((pcfface->charset_registry == "ISO10646") &&
+        (pcfface->charset_encoding) == "1")) [..]
+
+Thus the driver always export `ft_encoding_none' as
+face->charmap.encoding.  FT_Get_Char_Index() behavior is unmodified, that
+is, it converts the ULong value given as argument into the corresponding
+glyph number.
+
+
+Known problems
+**************
+
+- dealing explicitly with encodings breaks the uniformity of freetype2
+  api.
+
+- except for encodings properties, client applications have no
+  visibility of the PCF_Face object.  This means that applications
+  cannot directly access font tables and are obliged to trust
+  FreeType.
+
+- currently, glyph names and ink_metrics are ignored.
+
+I plan to give full visibility of the PCF_Face object in the next
+release of the driver, thus implementing also glyph names and
+ink_metrics.
+
+- height is defined as (ascent - descent).  Is this correct?
+
+- if unable to read size information from the font, PCF_Init_Face
+  sets available_size->width and available_size->height to 12.
+
+- too many english grammar errors in the readme file :-(
+
+
+License
+*******
+
+Copyright (C) 2000 by Francesco Zappa Nardelli
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+Credits
+*******
+
+Keith Packard wrote the pcf driver found in XFree86.  His work is at
+the same time the specification and the sample implementation of the
+PCF format.  Undoubtedly, this driver is inspired from his work.