annotate lisp/mule/mule-x-init.el @ 5716:1003acd5a4b8

Fix cygwin build on new win32api.
author Vin Shelton <acs@xemacs.org>
date Mon, 04 Feb 2013 20:03:04 -0500
parents 071b810ceb18
children
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1 ;;; mule-x-init.el --- initialization code for X Windows under MULE -*- coding: iso-2022-7bit; -*-
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2 ;; Copyright (C) 1994 Free Software Foundation, Inc.
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3 ;; Copyright (C) 1996, 2002 Ben Wing <ben@xemacs.org>
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4
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5 ;; Author: various
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6 ;; Keywords: mule X11
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software: you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by the
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12 ;; Free Software Foundation, either version 3 of the License, or (at your
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13 ;; option) any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but WITHOUT
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16 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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18 ;; for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs. If not, see <http://www.gnu.org/licenses/>.
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22
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23 ;;; Commentary:
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24
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25 ;;; Code:
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26
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27 ;;; Work around what is arguably a Sun CDE bug.
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28
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29 ;; #### This is unused, apparently.
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30 (defun x-use-halfwidth-roman-font (fullwidth-charset roman-registry)
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31 "Maybe set charset registry of the 'ascii charset to ROMAN-REGISTRY.
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32
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33 Do this only if:
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34 - the current display is an X device
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35 - the displayed width of FULLWIDTH-CHARSET is twice the displayed
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36 width of the 'ascii charset, but only when using ROMAN-REGISTRY.
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37
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38 Traditionally, Asian characters have been displayed so that they
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39 occupy exactly twice the screen space of ASCII (`halfwidth')
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40 characters. On many systems, e.g. Sun CDE systems, this can only be
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41 achieved by using a national variant roman font to display ASCII."
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42 (labels ((charset-font-width (charset)
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43 (font-instance-width
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44 (face-font-instance 'default (selected-device) charset)))
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45
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46 (twice-as-wide (cs1 cs2)
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47 (let ((width1 (charset-font-width cs1))
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48 (width2 (charset-font-width cs2)))
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49 (and width1 width2 (eq (+ width1 width1) width2)))))
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50 (declare (inline charset-font-width))
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51 (when (eq 'x (device-type))
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52 (let ((original-registries (charset-registries 'ascii)))
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53 (condition-case nil
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54 (unless (twice-as-wide 'ascii fullwidth-charset)
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55 (set-charset-registries 'ascii (vector roman-registry))
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56 (unless (twice-as-wide 'ascii fullwidth-charset)
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57 ;; Restore if roman-registry didn't help
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58 (set-charset-registries 'ascii original-registries)))
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59 (error (set-charset-registries 'ascii original-registries)))))))
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60
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61 ;;;;