FreeBSD/Linux Kernel Cross Reference
sys/sys/font.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2009, 2013 The FreeBSD Foundation
      *
      * This software was developed by Ed Schouten under sponsorship from the
      * FreeBSD Foundation.
      *
      * Portions of this software were developed by Oleksandr Rybalko
     * under sponsorship from the FreeBSD Foundation.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_FONT_H_
    #define _SYS_FONT_H_
    
    #include <sys/queue.h>
    
    /*
     * Fonts.
     *
     * Fonts support normal and bold weights, and single and double width glyphs.
     * Mapping tables are used to map Unicode points to glyphs.  They are sorted by
     * code point, and vtfont_lookup() uses this to perform a binary search.  Each
     * font has four mapping tables: two weights times two halves (left/single,
     * right).  When a character is not present in a bold map the glyph from the
     * normal map is used.  When no glyph is available, it uses glyph 0, which is
     * normally equal to U+FFFD.
     */
    
    enum vfnt_map_type {
            VFNT_MAP_NORMAL = 0,    /* Normal font. */
            VFNT_MAP_NORMAL_RIGHT,  /* Normal font right hand. */
            VFNT_MAP_BOLD,          /* Bold font. */
            VFNT_MAP_BOLD_RIGHT,    /* Bold font right hand. */
            VFNT_MAPS               /* Number of maps. */
    };
    
    struct font_info {
            int32_t fi_checksum;
            uint32_t fi_width;
            uint32_t fi_height;
            uint32_t fi_bitmap_size;
            uint32_t fi_map_count[VFNT_MAPS];
    };
    
    struct vfnt_map {
            uint32_t         vfm_src;
            uint16_t         vfm_dst;
            uint16_t         vfm_len;
    } __packed;
    typedef struct vfnt_map vfnt_map_t;
    
    struct vt_font {
            vfnt_map_t      *vf_map[VFNT_MAPS];
            uint8_t         *vf_bytes;
            uint32_t         vf_height;
            uint32_t         vf_width;
            uint32_t         vf_map_count[VFNT_MAPS];
            uint32_t         vf_refcount;
    };
    
    typedef struct vt_font_bitmap_data {
            uint32_t        vfbd_width;
            uint32_t        vfbd_height;
            uint32_t        vfbd_compressed_size;
            uint32_t        vfbd_uncompressed_size;
            uint8_t         *vfbd_compressed_data;
            struct vt_font  *vfbd_font;
    } vt_font_bitmap_data_t;
    
    typedef enum {
            FONT_AUTO,      /* This font is loaded by software */
            FONT_MANUAL,    /* This font is loaded manually by user */
            FONT_BUILTIN,   /* This font was built in at compile time */
            FONT_RELOAD     /* This font is marked to be re-read from file */
    } FONT_FLAGS;
   
   struct fontlist {
           char                    *font_name;
           FONT_FLAGS              font_flags;
           vt_font_bitmap_data_t   *font_data;
           vt_font_bitmap_data_t   *(*font_load)(char *);
           STAILQ_ENTRY(fontlist)  font_next;
   };
   
   typedef STAILQ_HEAD(font_list, fontlist) font_list_t;
   
   #define FONT_HEADER_MAGIC       "VFNT0002"
   struct font_header {
           uint8_t         fh_magic[8];
           uint8_t         fh_width;
           uint8_t         fh_height;
           uint16_t        fh_pad;
           uint32_t        fh_glyph_count;
           uint32_t        fh_map_count[VFNT_MAPS];
   } __packed;
   
   #endif /* !_SYS_FONT_H_ */

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