716 lines
18 KiB
C++
716 lines
18 KiB
C++
/*
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* Copyright © 2011 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef OPTIONS_HH
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#define OPTIONS_HH
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#include "hb.hh"
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#include "hb-subset.h"
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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#include <assert.h>
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#include <math.h>
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#include <locale.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h> /* for isatty() */
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#endif
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#if defined(_WIN32) || defined(__CYGWIN__)
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#include <io.h> /* for setmode() under Windows */
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#endif
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#include <hb.h>
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#include <hb-ot.h>
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#include <glib.h>
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#include <glib/gprintf.h>
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void fail (hb_bool_t suggest_help, const char *format, ...) G_GNUC_NORETURN G_GNUC_PRINTF (2, 3);
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struct option_group_t
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{
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virtual ~option_group_t () {}
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virtual void add_options (struct option_parser_t *parser) = 0;
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virtual void pre_parse (GError **error G_GNUC_UNUSED) {}
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virtual void post_parse (GError **error G_GNUC_UNUSED) {}
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};
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struct option_parser_t
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{
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option_parser_t (const char *usage)
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{
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memset (this, 0, sizeof (*this));
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usage_str = usage;
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context = g_option_context_new (usage);
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to_free = g_ptr_array_new ();
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add_main_options ();
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}
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static void _g_free_g_func (void *p, void * G_GNUC_UNUSED) { g_free (p); }
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~option_parser_t ()
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{
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g_option_context_free (context);
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g_ptr_array_foreach (to_free, _g_free_g_func, nullptr);
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g_ptr_array_free (to_free, TRUE);
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}
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void add_main_options ();
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void add_group (GOptionEntry *entries,
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const gchar *name,
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const gchar *description,
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const gchar *help_description,
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option_group_t *option_group);
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void free_later (char *p) {
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g_ptr_array_add (to_free, p);
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}
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void parse (int *argc, char ***argv);
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G_GNUC_NORETURN void usage () {
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g_printerr ("Usage: %s [OPTION...] %s\n", g_get_prgname (), usage_str);
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exit (1);
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}
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private:
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const char *usage_str;
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GOptionContext *context;
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GPtrArray *to_free;
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};
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#define DEFAULT_MARGIN 16
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#define DEFAULT_FORE "#000000"
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#define DEFAULT_BACK "#FFFFFF"
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#define FONT_SIZE_UPEM 0x7FFFFFFF
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#define FONT_SIZE_NONE 0
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struct view_options_t : option_group_t
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{
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view_options_t (option_parser_t *parser)
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{
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annotate = false;
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fore = nullptr;
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back = nullptr;
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line_space = 0;
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have_font_extents = false;
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font_extents.ascent = font_extents.descent = font_extents.line_gap = 0;
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margin.t = margin.r = margin.b = margin.l = DEFAULT_MARGIN;
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add_options (parser);
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}
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~view_options_t () override
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{
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g_free (fore);
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g_free (back);
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}
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void add_options (option_parser_t *parser) override;
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hb_bool_t annotate;
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char *fore;
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char *back;
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double line_space;
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bool have_font_extents;
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struct font_extents_t {
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double ascent, descent, line_gap;
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} font_extents;
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struct margin_t {
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double t, r, b, l;
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} margin;
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};
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struct shape_options_t : option_group_t
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{
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shape_options_t (option_parser_t *parser)
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{
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direction = language = script = nullptr;
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bot = eot = preserve_default_ignorables = remove_default_ignorables = false;
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features = nullptr;
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num_features = 0;
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shapers = nullptr;
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utf8_clusters = false;
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invisible_glyph = 0;
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cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
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normalize_glyphs = false;
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verify = false;
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num_iterations = 1;
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add_options (parser);
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}
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~shape_options_t () override
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{
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g_free (direction);
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g_free (language);
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g_free (script);
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free (features);
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g_strfreev (shapers);
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}
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void add_options (option_parser_t *parser) override;
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void setup_buffer (hb_buffer_t *buffer)
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{
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hb_buffer_set_direction (buffer, hb_direction_from_string (direction, -1));
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hb_buffer_set_script (buffer, hb_script_from_string (script, -1));
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hb_buffer_set_language (buffer, hb_language_from_string (language, -1));
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hb_buffer_set_flags (buffer, (hb_buffer_flags_t)
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(HB_BUFFER_FLAG_DEFAULT |
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(bot ? HB_BUFFER_FLAG_BOT : 0) |
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(eot ? HB_BUFFER_FLAG_EOT : 0) |
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(preserve_default_ignorables ? HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES : 0) |
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(remove_default_ignorables ? HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES : 0) |
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0));
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hb_buffer_set_invisible_glyph (buffer, invisible_glyph);
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hb_buffer_set_cluster_level (buffer, cluster_level);
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hb_buffer_guess_segment_properties (buffer);
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}
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static void copy_buffer_properties (hb_buffer_t *dst, hb_buffer_t *src)
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{
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hb_segment_properties_t props;
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hb_buffer_get_segment_properties (src, &props);
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hb_buffer_set_segment_properties (dst, &props);
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hb_buffer_set_flags (dst, hb_buffer_get_flags (src));
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hb_buffer_set_cluster_level (dst, hb_buffer_get_cluster_level (src));
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}
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void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len,
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const char *text_before, const char *text_after)
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{
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hb_buffer_clear_contents (buffer);
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if (text_before) {
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unsigned int len = strlen (text_before);
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hb_buffer_add_utf8 (buffer, text_before, len, len, 0);
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}
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hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
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if (text_after) {
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hb_buffer_add_utf8 (buffer, text_after, -1, 0, 0);
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}
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if (!utf8_clusters) {
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/* Reset cluster values to refer to Unicode character index
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* instead of UTF-8 index. */
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unsigned int num_glyphs = hb_buffer_get_length (buffer);
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
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for (unsigned int i = 0; i < num_glyphs; i++)
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{
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info->cluster = i;
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info++;
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}
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}
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setup_buffer (buffer);
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}
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hb_bool_t shape (hb_font_t *font, hb_buffer_t *buffer, const char **error=nullptr)
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{
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hb_buffer_t *text_buffer = nullptr;
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if (verify)
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{
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text_buffer = hb_buffer_create ();
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hb_buffer_append (text_buffer, buffer, 0, -1);
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}
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if (!hb_shape_full (font, buffer, features, num_features, shapers))
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{
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if (error)
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*error = "all shapers failed.";
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goto fail;
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}
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if (normalize_glyphs)
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hb_buffer_normalize_glyphs (buffer);
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if (verify && !verify_buffer (buffer, text_buffer, font, error))
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goto fail;
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if (text_buffer)
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hb_buffer_destroy (text_buffer);
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return true;
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fail:
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if (text_buffer)
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hb_buffer_destroy (text_buffer);
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return false;
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}
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bool verify_buffer (hb_buffer_t *buffer,
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hb_buffer_t *text_buffer,
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hb_font_t *font,
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const char **error=nullptr)
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{
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if (!verify_buffer_monotone (buffer, error))
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return false;
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if (!verify_buffer_safe_to_break (buffer, text_buffer, font, error))
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return false;
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return true;
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}
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bool verify_buffer_monotone (hb_buffer_t *buffer, const char **error=nullptr)
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{
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/* Check that clusters are monotone. */
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if (cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES ||
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cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
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{
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bool is_forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
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unsigned int num_glyphs;
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
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for (unsigned int i = 1; i < num_glyphs; i++)
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if (info[i-1].cluster != info[i].cluster &&
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(info[i-1].cluster < info[i].cluster) != is_forward)
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{
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if (error)
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*error = "clusters are not monotone.";
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return false;
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}
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}
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return true;
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}
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bool verify_buffer_safe_to_break (hb_buffer_t *buffer,
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hb_buffer_t *text_buffer,
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hb_font_t *font,
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const char **error=nullptr)
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{
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if (cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES &&
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cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
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{
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/* Cannot perform this check without monotone clusters.
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* Then again, unsafe-to-break flag is much harder to use without
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* monotone clusters. */
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return true;
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}
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/* Check that breaking up shaping at safe-to-break is indeed safe. */
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hb_buffer_t *fragment = hb_buffer_create ();
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hb_buffer_t *reconstruction = hb_buffer_create ();
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copy_buffer_properties (reconstruction, buffer);
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unsigned int num_glyphs;
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
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unsigned int num_chars;
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hb_glyph_info_t *text = hb_buffer_get_glyph_infos (text_buffer, &num_chars);
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/* Chop text and shape fragments. */
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bool forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
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unsigned int start = 0;
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unsigned int text_start = forward ? 0 : num_chars;
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unsigned int text_end = text_start;
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for (unsigned int end = 1; end < num_glyphs + 1; end++)
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{
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if (end < num_glyphs &&
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(info[end].cluster == info[end-1].cluster ||
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info[end-(forward?0:1)].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK))
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continue;
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/* Shape segment corresponding to glyphs start..end. */
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if (end == num_glyphs)
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{
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if (forward)
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text_end = num_chars;
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else
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text_start = 0;
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}
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else
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{
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if (forward)
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{
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unsigned int cluster = info[end].cluster;
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while (text_end < num_chars && text[text_end].cluster < cluster)
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text_end++;
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}
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else
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{
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unsigned int cluster = info[end - 1].cluster;
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while (text_start && text[text_start - 1].cluster >= cluster)
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text_start--;
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}
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}
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assert (text_start < text_end);
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if (0)
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printf("start %d end %d text start %d end %d\n", start, end, text_start, text_end);
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hb_buffer_clear_contents (fragment);
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copy_buffer_properties (fragment, buffer);
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/* TODO: Add pre/post context text. */
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hb_buffer_flags_t flags = hb_buffer_get_flags (fragment);
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if (0 < text_start)
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flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_BOT);
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if (text_end < num_chars)
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flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_EOT);
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hb_buffer_set_flags (fragment, flags);
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hb_buffer_append (fragment, text_buffer, text_start, text_end);
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if (!hb_shape_full (font, fragment, features, num_features, shapers))
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{
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if (error)
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*error = "all shapers failed while shaping fragment.";
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hb_buffer_destroy (reconstruction);
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hb_buffer_destroy (fragment);
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return false;
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}
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hb_buffer_append (reconstruction, fragment, 0, -1);
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start = end;
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if (forward)
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text_start = text_end;
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else
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text_end = text_start;
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}
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bool ret = true;
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hb_buffer_diff_flags_t diff = hb_buffer_diff (reconstruction, buffer, (hb_codepoint_t) -1, 0);
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if (diff)
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{
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if (error)
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*error = "Safe-to-break test failed.";
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ret = false;
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/* Return the reconstructed result instead so it can be inspected. */
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hb_buffer_set_length (buffer, 0);
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hb_buffer_append (buffer, reconstruction, 0, -1);
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}
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hb_buffer_destroy (reconstruction);
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hb_buffer_destroy (fragment);
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return ret;
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}
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void shape_closure (const char *text, int text_len,
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hb_font_t *font, hb_buffer_t *buffer,
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hb_set_t *glyphs)
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{
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hb_buffer_reset (buffer);
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hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
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setup_buffer (buffer);
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hb_ot_shape_glyphs_closure (font, buffer, features, num_features, glyphs);
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}
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/* Buffer properties */
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char *direction;
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char *language;
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char *script;
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/* Buffer flags */
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hb_bool_t bot;
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hb_bool_t eot;
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hb_bool_t preserve_default_ignorables;
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hb_bool_t remove_default_ignorables;
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hb_feature_t *features;
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unsigned int num_features;
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char **shapers;
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hb_bool_t utf8_clusters;
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hb_codepoint_t invisible_glyph;
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hb_buffer_cluster_level_t cluster_level;
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hb_bool_t normalize_glyphs;
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hb_bool_t verify;
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unsigned int num_iterations;
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};
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struct font_options_t : option_group_t
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{
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font_options_t (option_parser_t *parser,
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int default_font_size_,
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unsigned int subpixel_bits_)
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{
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variations = nullptr;
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num_variations = 0;
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default_font_size = default_font_size_;
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x_ppem = 0;
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y_ppem = 0;
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ptem = 0.;
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subpixel_bits = subpixel_bits_;
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font_file = nullptr;
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face_index = 0;
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font_size_x = font_size_y = default_font_size;
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font_funcs = nullptr;
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ft_load_flags = 2;
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blob = nullptr;
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font = nullptr;
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add_options (parser);
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}
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~font_options_t () override
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{
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g_free (font_file);
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free (variations);
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g_free (font_funcs);
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hb_font_destroy (font);
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}
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void add_options (option_parser_t *parser) override;
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hb_font_t *get_font () const;
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char *font_file;
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mutable hb_blob_t *blob;
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int face_index;
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hb_variation_t *variations;
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unsigned int num_variations;
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int default_font_size;
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int x_ppem;
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int y_ppem;
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double ptem;
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unsigned int subpixel_bits;
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mutable double font_size_x;
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mutable double font_size_y;
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char *font_funcs;
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int ft_load_flags;
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private:
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mutable hb_font_t *font;
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};
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struct text_options_t : option_group_t
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{
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text_options_t (option_parser_t *parser)
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{
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text_before = nullptr;
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text_after = nullptr;
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text_len = -1;
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text = nullptr;
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text_file = nullptr;
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fp = nullptr;
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gs = nullptr;
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line = nullptr;
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line_len = UINT_MAX;
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add_options (parser);
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}
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~text_options_t () override
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{
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g_free (text_before);
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|
g_free (text_after);
|
|
g_free (text);
|
|
g_free (text_file);
|
|
if (gs)
|
|
g_string_free (gs, true);
|
|
if (fp && fp != stdin)
|
|
fclose (fp);
|
|
}
|
|
|
|
void add_options (option_parser_t *parser) override;
|
|
|
|
void post_parse (GError **error G_GNUC_UNUSED) override {
|
|
if (text && text_file)
|
|
g_set_error (error,
|
|
G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
|
|
"Only one of text and text-file can be set");
|
|
}
|
|
|
|
const char *get_line (unsigned int *len, char eol);
|
|
|
|
char *text_before;
|
|
char *text_after;
|
|
|
|
int text_len;
|
|
char *text;
|
|
char *text_file;
|
|
|
|
private:
|
|
FILE *fp;
|
|
GString *gs;
|
|
char *line;
|
|
unsigned int line_len;
|
|
};
|
|
|
|
struct output_options_t : option_group_t
|
|
{
|
|
output_options_t (option_parser_t *parser,
|
|
const char **supported_formats_ = nullptr)
|
|
{
|
|
output_file = nullptr;
|
|
output_format = nullptr;
|
|
supported_formats = supported_formats_;
|
|
explicit_output_format = false;
|
|
|
|
fp = nullptr;
|
|
|
|
add_options (parser);
|
|
}
|
|
~output_options_t () override
|
|
{
|
|
g_free (output_file);
|
|
g_free (output_format);
|
|
if (fp && fp != stdout)
|
|
fclose (fp);
|
|
}
|
|
|
|
void add_options (option_parser_t *parser) override;
|
|
|
|
void post_parse (GError **error G_GNUC_UNUSED) override
|
|
{
|
|
if (output_format)
|
|
explicit_output_format = true;
|
|
|
|
if (output_file && !output_format) {
|
|
output_format = strrchr (output_file, '.');
|
|
if (output_format)
|
|
{
|
|
output_format++; /* skip the dot */
|
|
output_format = g_strdup (output_format);
|
|
}
|
|
}
|
|
|
|
if (output_file && 0 == strcmp (output_file, "-"))
|
|
output_file = nullptr; /* STDOUT */
|
|
}
|
|
|
|
FILE *get_file_handle ();
|
|
|
|
char *output_file;
|
|
char *output_format;
|
|
const char **supported_formats;
|
|
bool explicit_output_format;
|
|
|
|
mutable FILE *fp;
|
|
};
|
|
|
|
struct format_options_t : option_group_t
|
|
{
|
|
format_options_t (option_parser_t *parser) {
|
|
show_glyph_names = true;
|
|
show_positions = true;
|
|
show_advances = true;
|
|
show_clusters = true;
|
|
show_text = false;
|
|
show_unicode = false;
|
|
show_line_num = false;
|
|
show_extents = false;
|
|
show_flags = false;
|
|
trace = false;
|
|
|
|
add_options (parser);
|
|
}
|
|
|
|
void add_options (option_parser_t *parser) override;
|
|
|
|
void serialize (hb_buffer_t *buffer,
|
|
hb_font_t *font,
|
|
hb_buffer_serialize_format_t format,
|
|
hb_buffer_serialize_flags_t flags,
|
|
GString *gs);
|
|
void serialize_line_no (unsigned int line_no,
|
|
GString *gs);
|
|
void serialize_buffer_of_text (hb_buffer_t *buffer,
|
|
unsigned int line_no,
|
|
const char *text,
|
|
unsigned int text_len,
|
|
hb_font_t *font,
|
|
GString *gs);
|
|
void serialize_message (unsigned int line_no,
|
|
const char *type,
|
|
const char *msg,
|
|
GString *gs);
|
|
void serialize_buffer_of_glyphs (hb_buffer_t *buffer,
|
|
unsigned int line_no,
|
|
const char *text,
|
|
unsigned int text_len,
|
|
hb_font_t *font,
|
|
hb_buffer_serialize_format_t output_format,
|
|
hb_buffer_serialize_flags_t format_flags,
|
|
GString *gs);
|
|
|
|
|
|
hb_bool_t show_glyph_names;
|
|
hb_bool_t show_positions;
|
|
hb_bool_t show_advances;
|
|
hb_bool_t show_clusters;
|
|
hb_bool_t show_text;
|
|
hb_bool_t show_unicode;
|
|
hb_bool_t show_line_num;
|
|
hb_bool_t show_extents;
|
|
hb_bool_t show_flags;
|
|
hb_bool_t trace;
|
|
};
|
|
|
|
struct subset_options_t : option_group_t
|
|
{
|
|
subset_options_t (option_parser_t *parser)
|
|
{
|
|
input = hb_subset_input_create_or_fail ();
|
|
num_iterations = 1;
|
|
add_options (parser);
|
|
}
|
|
|
|
~subset_options_t () override
|
|
{
|
|
hb_subset_input_destroy (input);
|
|
}
|
|
|
|
void add_options (option_parser_t *parser) override;
|
|
|
|
unsigned num_iterations;
|
|
hb_subset_input_t *input;
|
|
};
|
|
|
|
/* fallback implementation for scalbn()/scalbnf() for pre-2013 MSVC */
|
|
#if defined (_MSC_VER) && (_MSC_VER < 1800)
|
|
|
|
#ifndef FLT_RADIX
|
|
#define FLT_RADIX 2
|
|
#endif
|
|
|
|
__inline long double scalbn (long double x, int exp)
|
|
{
|
|
return x * (pow ((long double) FLT_RADIX, exp));
|
|
}
|
|
|
|
__inline float scalbnf (float x, int exp)
|
|
{
|
|
return x * (pow ((float) FLT_RADIX, exp));
|
|
}
|
|
#endif
|
|
|
|
#endif
|