-/* 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 to encode a character code into a glyph code of 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;
-
- /* Width of the space glyph of the font. */
- int space_width;
-
- /* Average width of glyphs in the font. */
- int average_width;
-
- /* 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 *));
-