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
30 #include "hb-private.hh"
42 #include <unistd.h> /* for isatty() */
44 #if defined(_WIN32) || defined(__CYGWIN__)
45 #include <io.h> /* for setmode() under Windows */
53 #include <glib/gprintf.h>
55 void fail (hb_bool_t suggest_help, const char *format, ...) G_GNUC_NORETURN G_GNUC_PRINTF (2, 3);
59 virtual void add_options (struct option_parser_t *parser) = 0;
61 virtual void pre_parse (GError **error G_GNUC_UNUSED) {};
62 virtual void post_parse (GError **error G_GNUC_UNUSED) {};
66 struct option_parser_t
68 option_parser_t (const char *usage) {
69 memset (this, 0, sizeof (*this));
71 context = g_option_context_new (usage);
72 to_free = g_ptr_array_new ();
76 ~option_parser_t (void) {
77 g_option_context_free (context);
78 g_ptr_array_foreach (to_free, (GFunc) g_free, nullptr);
79 g_ptr_array_free (to_free, TRUE);
82 void add_main_options (void);
84 void add_group (GOptionEntry *entries,
86 const gchar *description,
87 const gchar *help_description,
88 option_group_t *option_group);
90 void free_later (char *p) {
91 g_ptr_array_add (to_free, p);
94 void parse (int *argc, char ***argv);
96 G_GNUC_NORETURN void usage (void) {
97 g_printerr ("Usage: %s [OPTION...] %s\n", g_get_prgname (), usage_str);
102 const char *usage_str;
103 GOptionContext *context;
108 #define DEFAULT_MARGIN 16
109 #define DEFAULT_FORE "#000000"
110 #define DEFAULT_BACK "#FFFFFF"
111 #define FONT_SIZE_UPEM 0x7FFFFFFF
112 #define FONT_SIZE_NONE 0
114 struct view_options_t : option_group_t
116 view_options_t (option_parser_t *parser) {
121 margin.t = margin.r = margin.b = margin.l = DEFAULT_MARGIN;
123 add_options (parser);
125 ~view_options_t (void)
131 void add_options (option_parser_t *parser);
143 struct shape_options_t : option_group_t
145 shape_options_t (option_parser_t *parser)
147 direction = language = script = nullptr;
148 bot = eot = preserve_default_ignorables = remove_default_ignorables = false;
152 utf8_clusters = false;
153 cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
154 normalize_glyphs = false;
158 add_options (parser);
160 ~shape_options_t (void)
166 g_strfreev (shapers);
169 void add_options (option_parser_t *parser);
171 void setup_buffer (hb_buffer_t *buffer)
173 hb_buffer_set_direction (buffer, hb_direction_from_string (direction, -1));
174 hb_buffer_set_script (buffer, hb_script_from_string (script, -1));
175 hb_buffer_set_language (buffer, hb_language_from_string (language, -1));
176 hb_buffer_set_flags (buffer, (hb_buffer_flags_t)
177 (HB_BUFFER_FLAG_DEFAULT |
178 (bot ? HB_BUFFER_FLAG_BOT : 0) |
179 (eot ? HB_BUFFER_FLAG_EOT : 0) |
180 (preserve_default_ignorables ? HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES : 0) |
181 (remove_default_ignorables ? HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES : 0) |
183 hb_buffer_set_cluster_level (buffer, cluster_level);
184 hb_buffer_guess_segment_properties (buffer);
187 static void copy_buffer_properties (hb_buffer_t *dst, hb_buffer_t *src)
189 hb_segment_properties_t props;
190 hb_buffer_get_segment_properties (src, &props);
191 hb_buffer_set_segment_properties (dst, &props);
192 hb_buffer_set_flags (dst, hb_buffer_get_flags (src));
193 hb_buffer_set_cluster_level (dst, hb_buffer_get_cluster_level (src));
196 void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len,
197 const char *text_before, const char *text_after)
199 hb_buffer_clear_contents (buffer);
201 unsigned int len = strlen (text_before);
202 hb_buffer_add_utf8 (buffer, text_before, len, len, 0);
204 hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
206 hb_buffer_add_utf8 (buffer, text_after, -1, 0, 0);
209 if (!utf8_clusters) {
210 /* Reset cluster values to refer to Unicode character index
211 * instead of UTF-8 index. */
212 unsigned int num_glyphs = hb_buffer_get_length (buffer);
213 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
214 for (unsigned int i = 0; i < num_glyphs; i++)
221 setup_buffer (buffer);
224 hb_bool_t shape (hb_font_t *font, hb_buffer_t *buffer, const char **error=nullptr)
226 hb_buffer_t *text_buffer = nullptr;
229 text_buffer = hb_buffer_create ();
230 hb_buffer_append (text_buffer, buffer, 0, -1);
233 if (!hb_shape_full (font, buffer, features, num_features, shapers))
236 *error = "all shapers failed.";
240 if (normalize_glyphs)
241 hb_buffer_normalize_glyphs (buffer);
243 if (verify && !verify_buffer (buffer, text_buffer, font, error))
247 hb_buffer_destroy (text_buffer);
253 hb_buffer_destroy (text_buffer);
258 bool verify_buffer (hb_buffer_t *buffer,
259 hb_buffer_t *text_buffer,
261 const char **error=nullptr)
263 if (!verify_buffer_monotone (buffer, error))
265 if (!verify_buffer_safe_to_break (buffer, text_buffer, font, error))
270 bool verify_buffer_monotone (hb_buffer_t *buffer, const char **error=nullptr)
272 /* Check that clusters are monotone. */
273 if (cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES ||
274 cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
276 bool is_forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
278 unsigned int num_glyphs;
279 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
281 for (unsigned int i = 1; i < num_glyphs; i++)
282 if (info[i-1].cluster != info[i].cluster &&
283 (info[i-1].cluster < info[i].cluster) != is_forward)
286 *error = "clusters are not monotone.";
294 bool verify_buffer_safe_to_break (hb_buffer_t *buffer,
295 hb_buffer_t *text_buffer,
297 const char **error=nullptr)
299 if (cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES &&
300 cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
302 /* Cannot perform this check without monotone clusters.
303 * Then again, unsafe-to-break flag is much harder to use without
304 * monotone clusters. */
308 /* Check that breaking up shaping at safe-to-break is indeed safe. */
310 hb_buffer_t *fragment = hb_buffer_create ();
311 hb_buffer_t *reconstruction = hb_buffer_create ();
312 copy_buffer_properties (reconstruction, buffer);
314 unsigned int num_glyphs;
315 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
317 unsigned int num_chars;
318 hb_glyph_info_t *text = hb_buffer_get_glyph_infos (text_buffer, &num_chars);
320 /* Chop text and shape fragments. */
321 bool forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
322 unsigned int start = 0;
323 unsigned int text_start = forward ? 0 : num_chars;
324 unsigned int text_end = text_start;
325 for (unsigned int end = 1; end < num_glyphs + 1; end++)
327 if (end < num_glyphs &&
328 (info[end].cluster == info[end-1].cluster ||
329 info[end-(forward?0:1)].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK))
332 /* Shape segment corresponding to glyphs start..end. */
333 if (end == num_glyphs)
336 text_end = num_chars;
344 unsigned int cluster = info[end].cluster;
345 while (text_end < num_chars && text[text_end].cluster < cluster)
350 unsigned int cluster = info[end - 1].cluster;
351 while (text_start && text[text_start - 1].cluster >= cluster)
355 assert (text_start < text_end);
358 printf("start %d end %d text start %d end %d\n", start, end, text_start, text_end);
360 hb_buffer_clear_contents (fragment);
361 copy_buffer_properties (fragment, buffer);
363 /* TODO: Add pre/post context text. */
364 hb_buffer_flags_t flags = hb_buffer_get_flags (fragment);
366 flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_BOT);
367 if (text_end < num_chars)
368 flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_EOT);
369 hb_buffer_set_flags (fragment, flags);
371 hb_buffer_append (fragment, text_buffer, text_start, text_end);
372 if (!hb_shape_full (font, fragment, features, num_features, shapers))
375 *error = "all shapers failed while shaping fragment.";
376 hb_buffer_destroy (reconstruction);
377 hb_buffer_destroy (fragment);
380 hb_buffer_append (reconstruction, fragment, 0, -1);
384 text_start = text_end;
386 text_end = text_start;
390 hb_buffer_diff_flags_t diff = hb_buffer_diff (reconstruction, buffer, (hb_codepoint_t) -1, 0);
394 *error = "Safe-to-break test failed.";
397 /* Return the reconstructed result instead so it can be inspected. */
398 hb_buffer_set_length (buffer, 0);
399 hb_buffer_append (buffer, reconstruction, 0, -1);
402 hb_buffer_destroy (reconstruction);
403 hb_buffer_destroy (fragment);
408 void shape_closure (const char *text, int text_len,
409 hb_font_t *font, hb_buffer_t *buffer,
412 hb_buffer_reset (buffer);
413 hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
414 setup_buffer (buffer);
415 hb_ot_shape_glyphs_closure (font, buffer, features, num_features, glyphs);
418 /* Buffer properties */
426 hb_bool_t preserve_default_ignorables;
427 hb_bool_t remove_default_ignorables;
429 hb_feature_t *features;
430 unsigned int num_features;
432 hb_bool_t utf8_clusters;
433 hb_buffer_cluster_level_t cluster_level;
434 hb_bool_t normalize_glyphs;
436 unsigned int num_iterations;
440 struct font_options_t : option_group_t
442 font_options_t (option_parser_t *parser,
443 int default_font_size_,
444 unsigned int subpixel_bits_)
446 variations = nullptr;
448 default_font_size = default_font_size_;
452 subpixel_bits = subpixel_bits_;
455 font_size_x = font_size_y = default_font_size;
456 font_funcs = nullptr;
460 add_options (parser);
462 ~font_options_t (void) {
466 hb_font_destroy (font);
469 void add_options (option_parser_t *parser);
471 hb_font_t *get_font (void) const;
475 hb_variation_t *variations;
476 unsigned int num_variations;
477 int default_font_size;
481 unsigned int subpixel_bits;
482 mutable double font_size_x;
483 mutable double font_size_y;
487 mutable hb_font_t *font;
491 struct text_options_t : option_group_t
493 text_options_t (option_parser_t *parser) {
494 text_before = nullptr;
495 text_after = nullptr;
503 line_len = (unsigned int) -1;
505 add_options (parser);
507 ~text_options_t (void) {
508 g_free (text_before);
513 g_string_free (gs, true);
518 void add_options (option_parser_t *parser);
520 void post_parse (GError **error G_GNUC_UNUSED) {
521 if (text && text_file)
523 G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
524 "Only one of text and text-file can be set");
527 const char *get_line (unsigned int *len);
539 unsigned int line_len;
542 struct output_options_t : option_group_t
544 output_options_t (option_parser_t *parser,
545 const char **supported_formats_ = nullptr) {
546 output_file = nullptr;
547 output_format = nullptr;
548 supported_formats = supported_formats_;
549 explicit_output_format = false;
553 add_options (parser);
555 ~output_options_t (void) {
556 g_free (output_file);
557 g_free (output_format);
562 void add_options (option_parser_t *parser);
564 void post_parse (GError **error G_GNUC_UNUSED)
567 explicit_output_format = true;
569 if (output_file && !output_format) {
570 output_format = strrchr (output_file, '.');
573 output_format++; /* skip the dot */
574 output_format = strdup (output_format);
578 if (output_file && 0 == strcmp (output_file, "-"))
579 output_file = nullptr; /* STDOUT */
582 FILE *get_file_handle (void);
586 const char **supported_formats;
587 bool explicit_output_format;
592 struct format_options_t : option_group_t
594 format_options_t (option_parser_t *parser) {
595 show_glyph_names = true;
596 show_positions = true;
597 show_advances = true;
598 show_clusters = true;
600 show_unicode = false;
601 show_line_num = false;
602 show_extents = false;
606 add_options (parser);
609 void add_options (option_parser_t *parser);
611 void serialize_unicode (hb_buffer_t *buffer,
613 void serialize_glyphs (hb_buffer_t *buffer,
615 hb_buffer_serialize_format_t format,
616 hb_buffer_serialize_flags_t flags,
618 void serialize_line_no (unsigned int line_no,
620 void serialize_buffer_of_text (hb_buffer_t *buffer,
621 unsigned int line_no,
623 unsigned int text_len,
626 void serialize_message (unsigned int line_no,
630 void serialize_buffer_of_glyphs (hb_buffer_t *buffer,
631 unsigned int line_no,
633 unsigned int text_len,
635 hb_buffer_serialize_format_t output_format,
636 hb_buffer_serialize_flags_t format_flags,
640 hb_bool_t show_glyph_names;
641 hb_bool_t show_positions;
642 hb_bool_t show_advances;
643 hb_bool_t show_clusters;
645 hb_bool_t show_unicode;
646 hb_bool_t show_line_num;
647 hb_bool_t show_extents;
648 hb_bool_t show_flags;
652 struct subset_options_t : option_group_t
654 subset_options_t (option_parser_t *parser)
658 add_options (parser);
661 void add_options (option_parser_t *parser);
663 hb_bool_t drop_hints;
666 /* fallback implementation for scalbn()/scalbnf() for pre-2013 MSVC */
667 #if defined (_MSC_VER) && (_MSC_VER < 1800)
673 __inline long double scalbn (long double x, int exp)
675 return x * (pow ((long double) FLT_RADIX, exp));
678 __inline float scalbnf (float x, int exp)
680 return x * (pow ((float) FLT_RADIX, exp));