Home | History | Annotate | Download | only in util 
      1 /*
      2  * Copyright  2010  Behdad Esfahbod
      3  * Copyright  2011,2012  Google, Inc.
      4  *
      5  *  This is part of HarfBuzz, a text shaping library.
      6  *
      7  * Permission is hereby granted, without written agreement and without
      8  * license or royalty fees, to use, copy, modify, and distribute this
      9  * software and its documentation for any purpose, provided that the
     10  * above copyright notice and the following two paragraphs appear in
     11  * all copies of this software.
     12  *
     13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     17  * DAMAGE.
     18  *
     19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     24  *
     25  * Google Author(s): Garret Rieger, Rod Sheeter
     26  */
     27 
     28 #include <stdio.h>
     29 
     30 #include "main-font-text.hh"
     31 #include "hb-subset.h"
     32 
     33 /*
     34  * Command line interface to the harfbuzz font subsetter.
     35  */
     36 
     37 struct subset_consumer_t
     38 {
     39   subset_consumer_t (option_parser_t *parser)
     40       : failed (false), options (parser), subset_options (parser), font (nullptr), input (nullptr) {}
     41 
     42   void init (hb_buffer_t  *buffer_,
     43              const font_options_t *font_opts)
     44   {
     45     font = hb_font_reference (font_opts->get_font ());
     46     input = hb_subset_input_create_or_fail ();
     47   }
     48 
     49   void consume_line (const char   *text,
     50                      unsigned int  text_len,
     51                      const char   *text_before,
     52                      const char   *text_after)
     53   {
     54     // TODO(Q1) does this only get called with at least 1 codepoint?
     55     hb_set_t *codepoints = hb_subset_input_unicode_set (input);
     56     gchar *c = (gchar *)text;
     57     do {
     58       gunichar cp = g_utf8_get_char(c);
     59       hb_codepoint_t hb_cp = cp;
     60       hb_set_add (codepoints, hb_cp);
     61     } while ((c = g_utf8_find_next_char(c, text + text_len)) != nullptr);
     62   }
     63 
     64   hb_bool_t
     65   write_file (const char *output_file, hb_blob_t *blob) {
     66     unsigned int data_length;
     67     const char* data = hb_blob_get_data (blob, &data_length);
     68 
     69     FILE *fp_out = fopen(output_file, "wb");
     70     if (fp_out == nullptr) {
     71       fprintf(stderr, "Unable to open output file\n");
     72       return false;
     73     }
     74     int bytes_written = fwrite(data, 1, data_length, fp_out);
     75 
     76     fclose (fp_out);
     77 
     78     if (bytes_written == -1) {
     79       fprintf(stderr, "Unable to write output file\n");
     80       return false;
     81     }
     82     if ((unsigned int) bytes_written != data_length) {
     83       fprintf(stderr, "Expected %u bytes written, got %d\n", data_length,
     84               bytes_written);
     85       return false;
     86     }
     87     return true;
     88   }
     89 
     90   void finish (const font_options_t *font_opts)
     91   {
     92     hb_subset_input_set_drop_layout (input, !subset_options.keep_layout);
     93     hb_subset_input_set_drop_hints (input, subset_options.drop_hints);
     94     hb_subset_input_set_desubroutinize (input, subset_options.desubroutinize);
     95 
     96     hb_face_t *face = hb_font_get_face (font);
     97 
     98     hb_face_t *new_face = hb_subset (face, input);
     99     hb_blob_t *result = hb_face_reference_blob (new_face);
    100 
    101     failed = !hb_blob_get_length (result);
    102     if (!failed)
    103       write_file (options.output_file, result);
    104 
    105     hb_subset_input_destroy (input);
    106     hb_blob_destroy (result);
    107     hb_face_destroy (new_face);
    108     hb_font_destroy (font);
    109   }
    110 
    111   public:
    112   bool failed;
    113 
    114   private:
    115   output_options_t options;
    116   subset_options_t subset_options;
    117   hb_font_t *font;
    118   hb_subset_input_t *input;
    119 };
    120 
    121 int
    122 main (int argc, char **argv)
    123 {
    124   main_font_text_t<subset_consumer_t, 10, 0> driver;
    125   return driver.main (argc, argv);
    126 }
    127