code.delx.au - gnu-emacs/blob - admin/notes/font-backend

   1 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   2   Free Software Foundation, Inc.
   3 See the end of the file for license conditions.
   4
   5
   6 New font handling mechanism with font backend method
   7 ----------------------------------------------------
   8
   9 The new files are:
  10         font.h -- header providing font-backend related structures
  11                 (most important ones are "struct font" and "struct
  12                 font_driver"), macros, and etc.
  13         font.c -- main font handling code.
  14         xfont.c -- font-driver on X for X core fonts.
  15         ftfont.c -- generic font-driver for FreeType fonts providing
  16                 device-independent methods of struct font_driver.
  17         xftfont.c -- font-driver on X using Xft for FreeType fonts
  18                 utilizing methods provided by ftfont.c.
  19         ftxfont.c -- font-driver on X directly using FreeType fonts
  20                 utilizing methods provided by ftfont.c.
  21         w32font.c -- font driver on w32 using Windows native fonts,
  22                 corresponding to xfont.c
  23         w32uniscribe.c -- font driver on w32, using the uniscribe API
  24                 to provide complex script support for opentype fonts on
  25                 Windows 2000 and later, or earlier versions of Windows
  26                 with uniscribe installed as an add-on.
  27
  28 So we already have codes for X and w32.  For Mac it seems that we need
  29 these files:
  30         atmfont.c -- font-driver on mac using ATM fonts, corresponding
  31                 to xfont.c
  32 As BDF fonts are currently used on w32, we may also implement these:
  33         bdffont.c -- generic font-driver for BDF fonts, corresponding to
  34                 ftfont.c
  35         bdfw32font.c -- font-driver on w32 using BDF fonts,
  36                 corresponding to ftxfont.c
  37 But, as FreeType already supports BDF fonts, if FreeType and
  38 Fontconfig are also available on w32, what we need may be:
  39         ftw32font.c -- font-driver on w32 directly using FreeType fonts
  40                 utilizing methods provided by ftfont.c.
  41
  42 It may be interesting if Emacs supports a frame buffer directly and
  43 has these font driver.
  44         ftfbfont.c -- font-driver on FB for FreeType fonts.
  45         bdffbfont.c -- font-driver on FB for BDF fonts.
  46
  47 Note: The fontset related codes are not yet matured to work well with
  48 the font backend method.  So, for instance, even if you start Emacs
  49 as something like this:
  50   % emacs -fn tahoma
  51 Non-ASCII Latin characters will not be displayed by the font "tahoma".
  52 In such a case, please try this:
  53
  54 (set-fontset-font "fontset-default" 'latin '("tahoma" . "unicode-bmp"))
  55
  56 \f
  57 This file is part of GNU Emacs.
  58
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  62 (at your option) any later version.
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