2 * Copyright © 2011 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 * Google Author(s): Behdad Esfahbod
31 #include "hb-subset.h"
43 #include <unistd.h> /* for isatty() */
45 #if defined(_WIN32) || defined(__CYGWIN__)
46 #include <io.h> /* for setmode() under Windows */
52 #include <glib/gprintf.h>
54 void fail (hb_bool_t suggest_help, const char *format, ...) G_GNUC_NORETURN G_GNUC_PRINTF (2, 3);
58 virtual ~option_group_t () {}
60 virtual void add_options (struct option_parser_t *parser) = 0;
62 virtual void pre_parse (GError **error G_GNUC_UNUSED) {}
63 virtual void post_parse (GError **error G_GNUC_UNUSED) {}
67 struct option_parser_t
69 option_parser_t (const char *usage)
71 memset (this, 0, sizeof (*this));
73 context = g_option_context_new (usage);
74 to_free = g_ptr_array_new ();
79 static void _g_free_g_func (void *p, void * G_GNUC_UNUSED) { g_free (p); }
83 g_option_context_free (context);
84 g_ptr_array_foreach (to_free, _g_free_g_func, nullptr);
85 g_ptr_array_free (to_free, TRUE);
88 void add_main_options ();
90 void add_group (GOptionEntry *entries,
92 const gchar *description,
93 const gchar *help_description,
94 option_group_t *option_group);
96 void free_later (char *p) {
97 g_ptr_array_add (to_free, p);
100 void parse (int *argc, char ***argv);
102 G_GNUC_NORETURN void usage () {
103 g_printerr ("Usage: %s [OPTION...] %s\n", g_get_prgname (), usage_str);
108 const char *usage_str;
109 GOptionContext *context;
114 #define DEFAULT_MARGIN 16
115 #define DEFAULT_FORE "#000000"
116 #define DEFAULT_BACK "#FFFFFF"
117 #define FONT_SIZE_UPEM 0x7FFFFFFF
118 #define FONT_SIZE_NONE 0
120 struct view_options_t : option_group_t
122 view_options_t (option_parser_t *parser)
128 margin.t = margin.r = margin.b = margin.l = DEFAULT_MARGIN;
130 add_options (parser);
132 ~view_options_t () override
138 void add_options (option_parser_t *parser) override;
150 struct shape_options_t : option_group_t
152 shape_options_t (option_parser_t *parser)
154 direction = language = script = nullptr;
155 bot = eot = preserve_default_ignorables = remove_default_ignorables = false;
159 utf8_clusters = false;
161 cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
162 normalize_glyphs = false;
166 add_options (parser);
168 ~shape_options_t () override
174 g_strfreev (shapers);
177 void add_options (option_parser_t *parser) override;
179 void setup_buffer (hb_buffer_t *buffer)
181 hb_buffer_set_direction (buffer, hb_direction_from_string (direction, -1));
182 hb_buffer_set_script (buffer, hb_script_from_string (script, -1));
183 hb_buffer_set_language (buffer, hb_language_from_string (language, -1));
184 hb_buffer_set_flags (buffer, (hb_buffer_flags_t)
185 (HB_BUFFER_FLAG_DEFAULT |
186 (bot ? HB_BUFFER_FLAG_BOT : 0) |
187 (eot ? HB_BUFFER_FLAG_EOT : 0) |
188 (preserve_default_ignorables ? HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES : 0) |
189 (remove_default_ignorables ? HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES : 0) |
191 hb_buffer_set_invisible_glyph (buffer, invisible_glyph);
192 hb_buffer_set_cluster_level (buffer, cluster_level);
193 hb_buffer_guess_segment_properties (buffer);
196 static void copy_buffer_properties (hb_buffer_t *dst, hb_buffer_t *src)
198 hb_segment_properties_t props;
199 hb_buffer_get_segment_properties (src, &props);
200 hb_buffer_set_segment_properties (dst, &props);
201 hb_buffer_set_flags (dst, hb_buffer_get_flags (src));
202 hb_buffer_set_cluster_level (dst, hb_buffer_get_cluster_level (src));
205 void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len,
206 const char *text_before, const char *text_after)
208 hb_buffer_clear_contents (buffer);
210 unsigned int len = strlen (text_before);
211 hb_buffer_add_utf8 (buffer, text_before, len, len, 0);
213 hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
215 hb_buffer_add_utf8 (buffer, text_after, -1, 0, 0);
218 if (!utf8_clusters) {
219 /* Reset cluster values to refer to Unicode character index
220 * instead of UTF-8 index. */
221 unsigned int num_glyphs = hb_buffer_get_length (buffer);
222 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
223 for (unsigned int i = 0; i < num_glyphs; i++)
230 setup_buffer (buffer);
233 hb_bool_t shape (hb_font_t *font, hb_buffer_t *buffer, const char **error=nullptr)
235 hb_buffer_t *text_buffer = nullptr;
238 text_buffer = hb_buffer_create ();
239 hb_buffer_append (text_buffer, buffer, 0, -1);
242 if (!hb_shape_full (font, buffer, features, num_features, shapers))
245 *error = "all shapers failed.";
249 if (normalize_glyphs)
250 hb_buffer_normalize_glyphs (buffer);
252 if (verify && !verify_buffer (buffer, text_buffer, font, error))
256 hb_buffer_destroy (text_buffer);
262 hb_buffer_destroy (text_buffer);
267 bool verify_buffer (hb_buffer_t *buffer,
268 hb_buffer_t *text_buffer,
270 const char **error=nullptr)
272 if (!verify_buffer_monotone (buffer, error))
274 if (!verify_buffer_safe_to_break (buffer, text_buffer, font, error))
279 bool verify_buffer_monotone (hb_buffer_t *buffer, const char **error=nullptr)
281 /* Check that clusters are monotone. */
282 if (cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES ||
283 cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
285 bool is_forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
287 unsigned int num_glyphs;
288 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
290 for (unsigned int i = 1; i < num_glyphs; i++)
291 if (info[i-1].cluster != info[i].cluster &&
292 (info[i-1].cluster < info[i].cluster) != is_forward)
295 *error = "clusters are not monotone.";
303 bool verify_buffer_safe_to_break (hb_buffer_t *buffer,
304 hb_buffer_t *text_buffer,
306 const char **error=nullptr)
308 if (cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES &&
309 cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
311 /* Cannot perform this check without monotone clusters.
312 * Then again, unsafe-to-break flag is much harder to use without
313 * monotone clusters. */
317 /* Check that breaking up shaping at safe-to-break is indeed safe. */
319 hb_buffer_t *fragment = hb_buffer_create ();
320 hb_buffer_t *reconstruction = hb_buffer_create ();
321 copy_buffer_properties (reconstruction, buffer);
323 unsigned int num_glyphs;
324 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
326 unsigned int num_chars;
327 hb_glyph_info_t *text = hb_buffer_get_glyph_infos (text_buffer, &num_chars);
329 /* Chop text and shape fragments. */
330 bool forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
331 unsigned int start = 0;
332 unsigned int text_start = forward ? 0 : num_chars;
333 unsigned int text_end = text_start;
334 for (unsigned int end = 1; end < num_glyphs + 1; end++)
336 if (end < num_glyphs &&
337 (info[end].cluster == info[end-1].cluster ||
338 info[end-(forward?0:1)].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK))
341 /* Shape segment corresponding to glyphs start..end. */
342 if (end == num_glyphs)
345 text_end = num_chars;
353 unsigned int cluster = info[end].cluster;
354 while (text_end < num_chars && text[text_end].cluster < cluster)
359 unsigned int cluster = info[end - 1].cluster;
360 while (text_start && text[text_start - 1].cluster >= cluster)
364 assert (text_start < text_end);
367 printf("start %d end %d text start %d end %d\n", start, end, text_start, text_end);
369 hb_buffer_clear_contents (fragment);
370 copy_buffer_properties (fragment, buffer);
372 /* TODO: Add pre/post context text. */
373 hb_buffer_flags_t flags = hb_buffer_get_flags (fragment);
375 flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_BOT);
376 if (text_end < num_chars)
377 flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_EOT);
378 hb_buffer_set_flags (fragment, flags);
380 hb_buffer_append (fragment, text_buffer, text_start, text_end);
381 if (!hb_shape_full (font, fragment, features, num_features, shapers))
384 *error = "all shapers failed while shaping fragment.";
385 hb_buffer_destroy (reconstruction);
386 hb_buffer_destroy (fragment);
389 hb_buffer_append (reconstruction, fragment, 0, -1);
393 text_start = text_end;
395 text_end = text_start;
399 hb_buffer_diff_flags_t diff = hb_buffer_diff (reconstruction, buffer, (hb_codepoint_t) -1, 0);
403 *error = "Safe-to-break test failed.";
406 /* Return the reconstructed result instead so it can be inspected. */
407 hb_buffer_set_length (buffer, 0);
408 hb_buffer_append (buffer, reconstruction, 0, -1);
411 hb_buffer_destroy (reconstruction);
412 hb_buffer_destroy (fragment);
417 void shape_closure (const char *text, int text_len,
418 hb_font_t *font, hb_buffer_t *buffer,
421 hb_buffer_reset (buffer);
422 hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
423 setup_buffer (buffer);
424 hb_ot_shape_glyphs_closure (font, buffer, features, num_features, glyphs);
427 /* Buffer properties */
435 hb_bool_t preserve_default_ignorables;
436 hb_bool_t remove_default_ignorables;
438 hb_feature_t *features;
439 unsigned int num_features;
441 hb_bool_t utf8_clusters;
442 hb_codepoint_t invisible_glyph;
443 hb_buffer_cluster_level_t cluster_level;
444 hb_bool_t normalize_glyphs;
446 unsigned int num_iterations;
450 struct font_options_t : option_group_t
452 font_options_t (option_parser_t *parser,
453 int default_font_size_,
454 unsigned int subpixel_bits_)
456 variations = nullptr;
458 default_font_size = default_font_size_;
462 subpixel_bits = subpixel_bits_;
465 font_size_x = font_size_y = default_font_size;
466 font_funcs = nullptr;
472 add_options (parser);
474 ~font_options_t () override
479 hb_font_destroy (font);
482 void add_options (option_parser_t *parser) override;
484 hb_font_t *get_font () const;
487 mutable hb_blob_t *blob;
489 hb_variation_t *variations;
490 unsigned int num_variations;
491 int default_font_size;
495 unsigned int subpixel_bits;
496 mutable double font_size_x;
497 mutable double font_size_y;
502 mutable hb_font_t *font;
506 struct text_options_t : option_group_t
508 text_options_t (option_parser_t *parser)
510 text_before = nullptr;
511 text_after = nullptr;
520 line_len = (unsigned int) -1;
522 add_options (parser);
524 ~text_options_t () override
526 g_free (text_before);
531 g_string_free (gs, true);
532 if (fp && fp != stdin)
536 void add_options (option_parser_t *parser) override;
538 void post_parse (GError **error G_GNUC_UNUSED) override {
539 if (text && text_file)
541 G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
542 "Only one of text and text-file can be set");
545 const char *get_line (unsigned int *len);
558 unsigned int line_len;
561 struct output_options_t : option_group_t
563 output_options_t (option_parser_t *parser,
564 const char **supported_formats_ = nullptr)
566 output_file = nullptr;
567 output_format = nullptr;
568 supported_formats = supported_formats_;
569 explicit_output_format = false;
573 add_options (parser);
575 ~output_options_t () override
577 g_free (output_file);
578 g_free (output_format);
579 if (fp && fp != stdout)
583 void add_options (option_parser_t *parser) override;
585 void post_parse (GError **error G_GNUC_UNUSED) override
588 explicit_output_format = true;
590 if (output_file && !output_format) {
591 output_format = strrchr (output_file, '.');
594 output_format++; /* skip the dot */
595 output_format = g_strdup (output_format);
599 if (output_file && 0 == strcmp (output_file, "-"))
600 output_file = nullptr; /* STDOUT */
603 FILE *get_file_handle ();
607 const char **supported_formats;
608 bool explicit_output_format;
613 struct format_options_t : option_group_t
615 format_options_t (option_parser_t *parser) {
616 show_glyph_names = true;
617 show_positions = true;
618 show_advances = true;
619 show_clusters = true;
621 show_unicode = false;
622 show_line_num = false;
623 show_extents = false;
627 add_options (parser);
630 void add_options (option_parser_t *parser) override;
632 void serialize_unicode (hb_buffer_t *buffer,
634 void serialize_glyphs (hb_buffer_t *buffer,
636 hb_buffer_serialize_format_t format,
637 hb_buffer_serialize_flags_t flags,
639 void serialize_line_no (unsigned int line_no,
641 void serialize_buffer_of_text (hb_buffer_t *buffer,
642 unsigned int line_no,
644 unsigned int text_len,
647 void serialize_message (unsigned int line_no,
651 void serialize_buffer_of_glyphs (hb_buffer_t *buffer,
652 unsigned int line_no,
654 unsigned int text_len,
656 hb_buffer_serialize_format_t output_format,
657 hb_buffer_serialize_flags_t format_flags,
661 hb_bool_t show_glyph_names;
662 hb_bool_t show_positions;
663 hb_bool_t show_advances;
664 hb_bool_t show_clusters;
666 hb_bool_t show_unicode;
667 hb_bool_t show_line_num;
668 hb_bool_t show_extents;
669 hb_bool_t show_flags;
673 struct subset_options_t : option_group_t
675 subset_options_t (option_parser_t *parser)
677 input = hb_subset_input_create_or_fail ();
678 add_options (parser);
681 ~subset_options_t () override
683 hb_subset_input_destroy (input);
686 void add_options (option_parser_t *parser) override;
688 hb_subset_input_t *input;
691 /* fallback implementation for scalbn()/scalbnf() for pre-2013 MSVC */
692 #if defined (_MSC_VER) && (_MSC_VER < 1800)
698 __inline long double scalbn (long double x, int exp)
700 return x * (pow ((long double) FLT_RADIX, exp));
703 __inline float scalbnf (float x, int exp)
705 return x * (pow ((float) FLT_RADIX, exp));