otf2bdf.c

将windows 的ttf字库转化成嵌入式开发需要的bdf字库的工具。

/*
 * Copyright 2005 Computing Research Labs, New Mexico State University
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COMPUTING RESEARCH LAB OR NEW MEXICO STATE UNIVERSITY BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
 * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef lint
#ifdef __GNUC__
static char rcsid[] __attribute__ ((unused)) = "$Id: otf2bdf.c,v 1.3 2005/11/07 23:35:24 mleisher Exp $";
#else
static char rcsid[] = "$Id: otf2bdf.c,v 1.3 2005/11/07 23:35:24 mleisher Exp $";
#endif
#endif

#include <stdio.h>

#ifdef WIN32
#include <windows.h>
#else
#include <stdlib.h>
#include <unistd.h>
#endif

#include <string.h>

#include <freetype/freetype.h>
#include FT_GLYPH_H
#include FT_SFNT_NAMES_H
#include FT_TRUETYPE_TABLES_H

/*
 * Include the remapping support.
 */
#include "remap.h"

/**************************************************************************
 *
 * Macros.
 *
 **************************************************************************/

/*
 * The version of otf2bdf.
 */
#define OTF2BDF_VERSION "3.0"

/*
 * Set the default values used to generate a BDF font.
 */
#ifndef DEFAULT_PLATFORM_ID
#define DEFAULT_PLATFORM_ID 3
#endif

#ifndef DEFAULT_ENCODING_ID
#define DEFAULT_ENCODING_ID 1
#endif

#ifndef DEFAULT_POINT_SIZE
#define DEFAULT_POINT_SIZE 12
#endif

#ifndef DEFAULT_RESOLUTION
#define DEFAULT_RESOLUTION 100
#endif

/*
 * Used as a fallback for XLFD names where the character set/encoding can not
 * be determined.
 */
#ifndef DEFAULT_XLFD_CSET
#define DEFAULT_XLFD_CSET "-FontSpecific-0"
#endif

/*
 * nameID macros for getting strings from the OT font.
 */
#define BDFOTF_COPYRIGHT_STRING  0
#define BDFOTF_FAMILY_STRING     1
#define BDFOTF_SUBFAMILY_STRING  2
#define BDFOTF_UNIQUEID_STRING   3
#define BDFOTF_FULLNAME_STRING   4
#define BDFOTF_VENDOR_STRING     5
#define BDFOTF_POSTSCRIPT_STRING 6
#define BDFOTF_TRADEMARK_STRING  7

/*
 * String names for the string indexes. Used for error messages.
 */
static char *string_names[] = {
    "\"Copyright\"",
    "\"Family\"",
    "\"SubFamily\"",
    "\"Unique ID\"",
    "\"Full Name\"",
    "\"Vendor\"",
    "\"Postscript Name\"",
    "\"Trademark\""
};

#if 0
#define TTF_COPYRIGHT 0
#define TTF_TYPEFACE  1
#define TTF_PSNAME    6
#endif

#ifndef MAX
#define MAX(h,i) ((h) > (i) ? (h) : (i))
#endif

#ifndef MIN
#define MIN(l,o) ((l) < (o) ? (l) : (o))
#endif

/**************************************************************************
 *
 * General globals set from command line.
 *
 **************************************************************************/

/*
 * The program name.
 */
static char *prog;

/*
 * The flag indicating whether messages should be printed or not.
 */
static int verbose = 0;

/*
 * Flags used when loading glyphs.
 */
static int load_flags = FT_LOAD_DEFAULT;

/*
 * The default platform and encoding ID's.
 */
static int pid = DEFAULT_PLATFORM_ID;
static int eid = DEFAULT_ENCODING_ID;

/*
 * Default point size and resolutions.
 */
static int point_size = DEFAULT_POINT_SIZE;
static int hres = DEFAULT_RESOLUTION;
static int vres = DEFAULT_RESOLUTION;

/*
 * The user supplied foundry name to use in the XLFD name.
 */
static char *foundry_name = 0;

/*
 * The user supplied typeface name to use in the XLFD name.
 */
static char *face_name = 0;

/*
 * The user supplied weight name to use in the XLFD name.
 */
static char *weight_name = 0;

/*
 * The user supplied slant name to use in the XLFD name.
 */
static char *slant_name = 0;

/*
 * The user supplied width name to use in the XLFD name.
 */
static char *width_name = 0;

/*
 * The user supplied additional style name to use in the XLFD name.
 */
static char *style_name = 0;

/*
 * The user supplied spacing (p = proportional, c = character cell,
 * m = monospace).
 */
static int spacing = 0;

/*
 * The dash character to use in the names retrieved from the font.  Default is
 * the space.
 */
static int dashchar = ' ';

/*
 * Flag, bitmask, and max code for generating a subset of the glyphs in a font.
 */
static int do_subset = 0;
static unsigned short maxcode;
static unsigned long subset[2048];

/*
 * The flag that indicates the remapping table should be used to
 * reencode the font.
 */
static int do_remap = 0;

/**************************************************************************
 *
 * Internal globals.
 *
 **************************************************************************/

/*
 * Structure used for calculating the font bounding box as the glyphs are
 * generated.
 */
typedef struct {
    short minlb;
    short maxlb;
    short maxrb;
    short maxas;
    short maxds;
    short rbearing;
} bbx_t;

static bbx_t bbx;

/*
 * The buffer used to transfer the temporary file to the actual output file.
 */
#define OTF2BDF_IOBUFSIZ 8192
static char iobuf[OTF2BDF_IOBUFSIZ];

/*
 * The Units Per Em value used in numerous places.
 */
static FT_UShort upm;

/*
 * A flag indicating if a CMap was found or not.
 */
static FT_UShort nocmap;

/*
 * The scaling factor needed to compute the SWIDTH (scalable width) value
 * for BDF glyphs.
 */
static double swscale;

/**************************************************************************
 *
 * Platform and encoding table names.
 *
 **************************************************************************/

static char *platform_names[] = {
    "Apple Unicode", "Macintosh", "ISO", "Microsoft", "Unknown"
};
static int nplatform_names = sizeof(platform_names)/sizeof(platform_names[0]);

/*
 * Mac encoding names used when creating the BDF XLFD font name.
 */
static char *mac_encodings[] = {
    "-MacRoman-0",    "-MacJapanese-0",   "-MacChinese-0",   "-MacKorean-0",
    "-MacArabic-0",   "-MacHebrew-0",     "-MacGreek-0",     "-MacRussian-0",
    "-MacRSymbol-0",  "-MacDevanagari-0", "-MacGurmukhi-0",  "-MacGujarati-0",
    "-MacOriya-0",    "-MacBengali-0",    "-MacTamil-0",     "-MacTelugu-0",
    "-MacKannada-0",  "-MacMalayalam-0",  "-MacSinhalese-0", "-MacBurmese-0",
    "-MacKhmer-0",    "-MacThai-0",       "-MacLaotian-0",   "-MacGeorgian-0",
    "-MacArmenian-0", "-MacMaldivian-0",  "-MacTibetan-0",   "-MacMongolian-0",
    "-MacGeez-0",     "-MacSlavic-0",     "-MacVietnamese-0","-MacSindhi-0",
    "-MacUninterp-0"
};
static int nmac_encodings = sizeof(mac_encodings)/sizeof(mac_encodings[0]);

/*
 * ISO encoding names used when creating the BDF XLFD font name.
 */
static char *iso_encodings[] = {
    "-ASCII-0", "-ISO10646-1", "-ISO8859-1"
};
static int niso_encodings = sizeof(iso_encodings)/sizeof(iso_encodings[0]);

/*
 * Microsoft encoding names used when creating the BDF XLFD font name.
 */
static char *ms_encodings[] = {
    "-Symbol-0", "-ISO10646-1", "-ShiftJIS-0", "-GB2312.1980-0", "-Big5-0",
    "-KSC5601.1987-0", "-KSC5601.1992-0"
};
static int nms_encodings = sizeof(ms_encodings)/sizeof(ms_encodings[0]);

/*
 * The propery names for all the XLFD properties.
 */
static char *xlfd_props[] = {
    "FOUNDRY",
    "FAMILY_NAME",
    "WEIGHT_NAME",
    "SLANT",
    "SETWIDTH_NAME",
    "ADD_STYLE_NAME",
    "PIXEL_SIZE",
    "POINT_SIZE",
    "RESOLUTION_X",
    "RESOLUTION_Y",
    "SPACING",
    "AVERAGE_WIDTH",
    "CHARSET_REGISTRY",
    "CHARSET_ENCODING",
};

/**************************************************************************
 *
 * Freetype globals.
 *
 **************************************************************************/

static FT_Library library;
static FT_Face face;
static FT_Size_Metrics imetrics;
static TT_HoriHeader *horizontal;

/**************************************************************************
 *
 * Freetype related code.
 *
 **************************************************************************/

/*
 * A generic routine to get a name from the OT name table.  This routine
 * always looks for English language names and checks three possibilities:
 * 1. English names with the MS Unicode encoding ID.
 * 2. English names with the MS unknown encoding ID.
 * 3. English names with the Apple Unicode encoding ID.
 *
 * The particular name ID mut be provided (e.g. nameID = 0 for copyright
 * string, nameID = 6 for Postscript name, nameID = 1 for typeface name.
 *
 * If the `dash_to_space' flag is non-zero, all dashes (-) in the name will be
 * replaced with the character passed.
 *
 * Returns the number of bytes added.
 */
static int
otf_get_english_string(FT_Face face, int nameID, int dash_to_space,
                       char *name, int name_size)
{
    int j, encid;
    FT_UInt i, nrec;
    FT_SfntName sfntName;
    unsigned char *s;
    unsigned short slen;

    nrec = FT_Get_Sfnt_Name_Count(face);

    for (encid = 1, j = 0; j < 2; j++, encid--) {
        /*
         * Locate one of the MS English font names.
         */
        for (i = 0; i < nrec; i++) {
           FT_Get_Sfnt_Name(face, i, &sfntName);
           if (sfntName.platform_id == 3 &&
               sfntName.encoding_id == encid &&
               sfntName.name_id == nameID &&
               (sfntName.language_id == 0x0409 ||
                sfntName.language_id == 0x0809 ||
                sfntName.language_id == 0x0c09 ||
                sfntName.language_id == 0x1009 ||
                sfntName.language_id == 0x1409 ||
                sfntName.language_id == 0x1809)) {
               s = sfntName.string;
               slen = sfntName.string_len;
               break;
           }
        }

        if (i < nrec) {
            if (slen >> 1 >= name_size) {
                fprintf(stderr, "%s: warning: %s string longer than buffer. Truncating to %d bytes.\n", prog, string_names[nameID], name_size);
                slen = name_size << 1;
            }

            /*
             * Found one of the MS English font names.  The name is by
             * definition encoded in Unicode, so copy every second byte into
             * the `name' parameter, assuming there is enough space.
             */