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  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.
  97.