78 lines
3.2 KiB
Text
78 lines
3.2 KiB
Text
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Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
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Free Software Foundation, Inc.
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See the end of the file for license conditions.
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New font handling mechanism with font backend method
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----------------------------------------------------
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The configure script, if invoked with "--enable-font-backend", checks
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if libraries freetype and fontconfig exist. If they are both
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available, macro "USE_FONT_BACKEND" is defined in src/config.h. In
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that case, the existence of Xft library is checked too.
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The new files are:
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font.h -- header providing font-backend related structures
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(most important ones are "struct font" and "struct
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font_driver"), macros, and etc.
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font.c -- main font handling code.
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xfont.c -- font-driver on X for X core fonts.
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ftfont.c -- generic font-driver for FreeType fonts providing
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device-independent methods of struct font_driver.
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xftfont.c -- font-driver on X using Xft for FreeType fonts
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utilizing methods provided by ftfont.c.
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ftxfont.c -- font-driver on X directly using FreeType fonts
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utilizing methods provided by ftfont.c.
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w32font.c -- font driver on w32 using Windows native fonts,
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corresponding to xfont.c
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So we already have codes for X. For the other systems (w32 and mac),
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it seems that we need these files:
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atmfont.c -- font-driver on mac using ATM fonts, corresponding
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to xfont.c
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As BDF fonts are currently used on w32, we may also implement these:
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bdffont.c -- generic font-driver for BDF fonts, corresponding to
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ftfont.c
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bdfw32font.c -- font-driver on w32 using BDF fonts,
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corresponding to ftxfont.c
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But, as FreeType already supports BDF fonts, if FreeType and
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Fontconfig are also available on w32, what we need may be:
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ftw32font.c -- font-driver on w32 directly using FreeType fonts
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utilizing methods provided by ftfont.c.
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And, for those to work, macterm.c and macfns.c must be changed by the
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similar way as xterm.c and xfns.c (the parts "#ifdef USE_FONT_BACKEND"
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... "#endif" should be checked).
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It may be interesting if Emacs supports a frame buffer directly and
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has these font driver.
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ftfbfont.c -- font-driver on FB for FreeType fonts.
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bdffbfont.c -- font-driver on FB for BDF fonts.
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Note: The fontset related codes are not yet matured to work well with
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the font backend method. So, for instance, even if you start Emacs
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as something like this:
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% emacs -fn tahoma
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Non-ASCII Latin characters will not be displayed by the font "tahoma".
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In such a case, please try this:
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(set-fontset-font "fontset-default" 'latin '("tahoma" . "unicode-bmp"))
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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