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[Emacs-diffs] Changes to emacs/src/fontset.h [emacs-unicode-2]
From: |
Kenichi Handa |
Subject: |
[Emacs-diffs] Changes to emacs/src/fontset.h [emacs-unicode-2] |
Date: |
Mon, 08 Sep 2003 08:48:59 -0400 |
Index: emacs/src/fontset.h
diff -c /dev/null emacs/src/fontset.h:1.26.6.1
*** /dev/null Mon Sep 8 08:48:59 2003
--- emacs/src/fontset.h Mon Sep 8 08:48:11 2003
***************
*** 0 ****
--- 1,238 ----
+ /* Header for fontset handler.
+ Copyright (C) 1995, 1997, 2000 Electrotechnical Laboratory, JAPAN.
+ Licensed to the Free Software Foundation.
+ Copyright (C) 2003
+ National Institute of Advanced Industrial Science and Technology (AIST)
+ Registration Number H13PRO009
+
+ This file is part of GNU Emacs.
+
+ GNU Emacs is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ GNU Emacs is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNU Emacs; see the file COPYING. If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+ #ifndef EMACS_FONTSET_H
+ #define EMACS_FONTSET_H
+
+ /* This data type is used for the font_table field of window system
+ depending data area (e.g. struct x_display_info on X window). */
+
+ struct font_info
+ {
+ /* Pointer to window system dependent font structure. On X window,
+ this value should be coerced to (XFontStruct *). */
+ void *font;
+
+ /* Index number of the font. */
+ int font_idx;
+
+ /* Name to be used to find the font. */
+ char *name;
+
+ /* Full name of the font given by a window system. */
+ char *full_name;
+
+ /* Charset of characters displayed by the font. */
+ int charset;
+
+ #ifdef WINDOWSNT
+ /* Codepage of characters that will be displayed by the font. */
+ int codepage;
+ #endif
+
+ /* Maximum bound width over all existing characters of the font. On
+ X window, this is same as (font->max_bounds.width) */
+ int size;
+
+ /* Height of the font. On X window, this is the same as
+ (font->ascent + font->descent). */
+ int height;
+
+ /* 1 iff `vertical-centering-font-regexp' matches this font name.
+ In this case, we render characters at vartical center positions
+ of lines. */
+ int vertical_centering;
+
+ /* Encoding type of the font. The value is one of
+ 0, 1, 2, or 3:
+ 0: code points 0x20..0x7F or 0x2020..0x7F7F are used
+ 1: code points 0xA0..0xFF or 0xA0A0..0xFFFF are used
+ 2: code points 0x20A0..0x7FFF are used
+ 3: code points 0xA020..0xFF7F are used
+ If the member `font_encoder' is not NULL, this member is ignored.
+ */
+ unsigned char encoding_type;
+
+ /* The baseline position of a font is normally `ascent' value of the
+ font. However, there exists many fonts which don't set `ascent'
+ an appropriate value to be used as baseline position. This is
+ typical in such ASCII fonts which are designed to be used with
+ Chinese, Japanese, Korean characters. When we use mixture of
+ such fonts and normal fonts (having correct `ascent' value), a
+ display line gets very ugly. Since we have no way to fix it
+ automatically, it is users responsibility to supply well designed
+ fonts or correct `ascent' value of fonts. But, the latter
+ requires heavy work (modifying all bitmap data in BDF files).
+ So, Emacs accepts a private font property
+ `_MULE_BASELINE_OFFSET'. If a font has this property, we
+ calculate the baseline position by subtracting the value from
+ `ascent'. In other words, the value indicates how many bits
+ higher we should draw a character of the font than normal ASCII
+ text for a better looking.
+
+ We also have to consider the fact that the concept of `baseline'
+ differs among languages to which each character belongs. For
+ instance, baseline should be at the bottom most position of all
+ glyphs for Chinese, Japanese, and Korean. But, many of existing
+ fonts for those characters doesn't have correct `ascent' values
+ because they are designed to be used with ASCII fonts. To
+ display characters of different language on the same line, the
+ best way will be to arrange them in the middle of the line. So,
+ in such a case, again, we utilize the font property
+ `_MULE_BASELINE_OFFSET'. If the value is larger than `ascent' we
+ calculate baseline so that a character is arranged in the middle
+ of a line. */
+
+ int baseline_offset;
+
+ /* Non zero means a character should be composed at a position
+ relative to the height (or depth) of previous glyphs in the
+ following cases:
+ (1) The bottom of the character is higher than this value. In
+ this case, the character is drawn above the previous glyphs.
+ (2) The top of the character is lower than 0 (i.e. baseline
+ height). In this case, the character is drawn beneath the
+ previous glyphs.
+
+ This value is taken from a private font property
+ `_MULE_RELATIVE_COMPOSE' which is introduced by Emacs. */
+ int relative_compose;
+
+ /* Non zero means an ascent value to be used for a character
+ registered in char-table `use-default-ascent'. */
+ int default_ascent;
+
+ /* CCL program to calculate code points of the font. */
+ struct ccl_program *font_encoder;
+ };
+
+ /* A value which may appear in the member `encoding' of struch
+ font_info indicating that a font itself doesn't tell which encoding
+ to be used. */
+ #define FONT_ENCODING_NOT_DECIDED 255
+
+ enum FONT_SPEC_INDEX
+ {
+ FONT_SPEC_FAMILY_INDEX,
+ FONT_SPEC_WEIGHT_INDEX,
+ FONT_SPEC_SLANT_INDEX,
+ FONT_SPEC_SWIDTH_INDEX,
+ FONT_SPEC_ADSTYLE_INDEX,
+ FONT_SPEC_REGISTRY_INDEX,
+ FONT_SPEC_MAX_INDEX
+ };
+
+ /* Forward declaration for prototypes. */
+ struct frame;
+
+ /* The following six are window system dependent functions.
+ Initialization routine of each window system should set appropriate
+ functions to these variables. For instance, in case of X window,
+ x_term_init does this. */
+
+ /* Return a pointer to struct font_info of font FONT_IDX of frame F. */
+ extern struct font_info *(*get_font_info_func) P_ ((struct frame *f,
+ int font_idx));
+
+ /* Return a list of font names which matches PATTERN. See the document of
+ `x-list-fonts' for more detail. */
+ extern Lisp_Object (*list_fonts_func) P_ ((struct frame *f,
+ Lisp_Object pattern,
+ int size,
+ int maxnames));
+
+ /* Load a font named NAME for frame F and return a pointer to the
+ information of the loaded font. If loading is failed, return -1. */
+ extern struct font_info *(*load_font_func) P_ ((struct frame *f,
+ char *name, int));
+
+ /* Return a pointer to struct font_info of a font named NAME for frame F.
+ If no such font is loaded, return NULL. */
+ extern struct font_info *(*query_font_func) P_ ((struct frame *f, char
*name));
+
+ /* Additional function for setting fontset or changing fontset
+ contents of frame F. This function may change the coordinate of
+ the frame. */
+ extern void (*set_frame_fontset_func) P_ ((struct frame *f, Lisp_Object arg,
+ Lisp_Object oldval));
+
+ /* To find a CCL program, fs_load_font calls this function.
+ The argument is a pointer to the struct font_info.
+ This function set the memer `encoder' of the structure. */
+ extern void (*find_ccl_program_func) P_ ((struct font_info *));
+
+ extern Lisp_Object (*get_font_repertory_func) P_ ((struct frame *,
+ struct font_info *));
+
+ /* Check if any window system is used now. */
+ extern void (*check_window_system_func) P_ ((void));
+
+ struct face;
+
+ extern void free_face_fontset P_ ((FRAME_PTR, struct face *));
+ extern Lisp_Object fontset_font_pattern P_ ((FRAME_PTR, struct face *, int));
+ extern int face_suitable_for_char_p P_ ((struct face *, int));
+ extern int face_for_char P_ ((FRAME_PTR, struct face *, int));
+ extern int make_fontset_for_ascii_face P_ ((FRAME_PTR, int, struct face *));
+ extern int new_fontset_from_font_name P_ ((Lisp_Object));
+ extern struct font_info *fs_load_font P_ ((struct frame *, char *, int));
+ extern int fs_query_fontset P_ ((Lisp_Object, int));
+ EXFUN (Fquery_fontset, 2);
+ extern Lisp_Object list_fontsets P_ ((struct frame *, Lisp_Object, int));
+
+ extern Lisp_Object Vuse_default_ascent;
+ extern Lisp_Object Vignore_relative_composition;
+ extern Lisp_Object Valternate_fontname_alist;
+ extern Lisp_Object Vfontset_alias_alist;
+ extern Lisp_Object Vvertical_centering_font_regexp;
+
+ /* Load a font named FONTNAME on frame F. All fonts for frame F is
+ stored in a table pointed by FONT_TABLE. Return a pointer to the
+ struct font_info of the loaded font. If loading fails, return
+ NULL. */
+
+ #define FS_LOAD_FONT(f, fontname) fs_load_font (f, fontname, -1)
+
+
+ /* Return an immutable id for font_info FONT_INFO on frame F. The
+ reason for this macro is hat one cannot hold pointers to font_info
+ structures in other data structures, because the table is
+ reallocated in x_list_fonts. */
+
+ #define FONT_INFO_ID(F, FONT_INFO) \
+ (FONT_INFO) - (FRAME_X_DISPLAY_INFO ((F))->font_table)
+
+ /* Given a font_info id ID, return a pointer to the font_info
+ structure on frame F. If ID is invalid, return null. */
+
+ #define FONT_INFO_FROM_ID(F, ID) \
+ (((ID) >= 0 && (ID) < FRAME_X_DISPLAY_INFO ((F))->font_table_size)
\
+ ? (FRAME_X_DISPLAY_INFO ((F))->font_table + (ID))
\
+ : 0)
+
+ extern Lisp_Object fontset_name P_ ((int));
+ extern Lisp_Object fontset_ascii P_ ((int));
+ extern int fontset_height P_ ((int));
+
+ #endif /* EMACS_FONTSET_H */
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