Merge from emacs-23
[bpt/emacs.git] / admin / notes / font-backend
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5df4f04c 1Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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2 Free Software Foundation, Inc.
3See the end of the file for license conditions.
4
5
6New font handling mechanism with font backend method
7----------------------------------------------------
8
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9The 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
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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.
e88a2ed3 27
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28So we already have codes for X and w32. For Mac it seems that we need
29these files:
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30 atmfont.c -- font-driver on mac using ATM fonts, corresponding
31 to xfont.c
32As 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
37But, as FreeType already supports BDF fonts, if FreeType and
38Fontconfig 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
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42It may be interesting if Emacs supports a frame buffer directly and
43has these font driver.
44 ftfbfont.c -- font-driver on FB for FreeType fonts.
45 bdffbfont.c -- font-driver on FB for BDF fonts.
46
47Note: The fontset related codes are not yet matured to work well with
48the font backend method. So, for instance, even if you start Emacs
49as something like this:
50 % emacs -fn tahoma
51Non-ASCII Latin characters will not be displayed by the font "tahoma".
52In such a case, please try this:
53
54(set-fontset-font "fontset-default" 'latin '("tahoma" . "unicode-bmp"))
55
56\f
57This file is part of GNU Emacs.
58
9ad5de0c 59GNU Emacs is free software: you can redistribute it and/or modify
e88a2ed3 60it under the terms of the GNU General Public License as published by
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61the Free Software Foundation, either version 3 of the License, or
62(at your option) any later version.
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63
64GNU Emacs is distributed in the hope that it will be useful,
65but WITHOUT ANY WARRANTY; without even the implied warranty of
66MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
67GNU General Public License for more details.
68
69You should have received a copy of the GNU General Public License
9ad5de0c 70along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.