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 #if !GLIB_CHECK_VERSION (2, 22, 0)
56 # define g_mapped_file_unref g_mapped_file_free
59 void fail (hb_bool_t suggest_help, const char *format, ...) G_GNUC_NORETURN G_GNUC_PRINTF (2, 3);
61 extern hb_bool_t debug;
65 virtual void add_options (struct option_parser_t *parser) = 0;
67 virtual void pre_parse (GError **error G_GNUC_UNUSED) {};
68 virtual void post_parse (GError **error G_GNUC_UNUSED) {};
72 struct option_parser_t
74 option_parser_t (const char *usage) {
75 memset (this, 0, sizeof (*this));
77 context = g_option_context_new (usage);
78 to_free = g_ptr_array_new ();
82 ~option_parser_t (void) {
83 g_option_context_free (context);
84 g_ptr_array_foreach (to_free, (GFunc) g_free, nullptr);
85 g_ptr_array_free (to_free, TRUE);
88 void add_main_options (void);
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 (void) {
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) {
127 margin.t = margin.r = margin.b = margin.l = DEFAULT_MARGIN;
129 add_options (parser);
131 ~view_options_t (void)
137 void add_options (option_parser_t *parser);
149 struct shape_options_t : option_group_t
151 shape_options_t (option_parser_t *parser)
153 direction = language = script = nullptr;
154 bot = eot = preserve_default_ignorables = remove_default_ignorables = false;
158 utf8_clusters = false;
159 cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
160 normalize_glyphs = false;
164 add_options (parser);
166 ~shape_options_t (void)
172 g_strfreev (shapers);
175 void add_options (option_parser_t *parser);
177 void setup_buffer (hb_buffer_t *buffer)
179 hb_buffer_set_direction (buffer, hb_direction_from_string (direction, -1));
180 hb_buffer_set_script (buffer, hb_script_from_string (script, -1));
181 hb_buffer_set_language (buffer, hb_language_from_string (language, -1));
182 hb_buffer_set_flags (buffer, (hb_buffer_flags_t)
183 (HB_BUFFER_FLAG_DEFAULT |
184 (bot ? HB_BUFFER_FLAG_BOT : 0) |
185 (eot ? HB_BUFFER_FLAG_EOT : 0) |
186 (preserve_default_ignorables ? HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES : 0) |
187 (remove_default_ignorables ? HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES : 0) |
189 hb_buffer_set_cluster_level (buffer, cluster_level);
190 hb_buffer_guess_segment_properties (buffer);
193 static void copy_buffer_properties (hb_buffer_t *dst, hb_buffer_t *src)
195 hb_segment_properties_t props;
196 hb_buffer_get_segment_properties (src, &props);
197 hb_buffer_set_segment_properties (dst, &props);
198 hb_buffer_set_flags (dst, hb_buffer_get_flags (src));
199 hb_buffer_set_cluster_level (dst, hb_buffer_get_cluster_level (src));
202 void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len,
203 const char *text_before, const char *text_after)
205 hb_buffer_clear_contents (buffer);
207 unsigned int len = strlen (text_before);
208 hb_buffer_add_utf8 (buffer, text_before, len, len, 0);
210 hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
212 hb_buffer_add_utf8 (buffer, text_after, -1, 0, 0);
215 if (!utf8_clusters) {
216 /* Reset cluster values to refer to Unicode character index
217 * instead of UTF-8 index. */
218 unsigned int num_glyphs = hb_buffer_get_length (buffer);
219 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
220 for (unsigned int i = 0; i < num_glyphs; i++)
227 setup_buffer (buffer);
230 hb_bool_t shape (hb_font_t *font, hb_buffer_t *buffer, const char **error=nullptr)
232 hb_buffer_t *text_buffer = nullptr;
235 text_buffer = hb_buffer_create ();
236 hb_buffer_append (text_buffer, buffer, 0, -1);
239 if (!hb_shape_full (font, buffer, features, num_features, shapers))
242 *error = "all shapers failed.";
246 if (normalize_glyphs)
247 hb_buffer_normalize_glyphs (buffer);
249 if (verify && !verify_buffer (buffer, text_buffer, font, error))
253 hb_buffer_destroy (text_buffer);
259 hb_buffer_destroy (text_buffer);
264 bool verify_buffer (hb_buffer_t *buffer,
265 hb_buffer_t *text_buffer,
267 const char **error=nullptr)
269 if (!verify_buffer_monotone (buffer, error))
271 if (!verify_buffer_safe_to_break (buffer, text_buffer, font, error))
276 bool verify_buffer_monotone (hb_buffer_t *buffer, const char **error=nullptr)
278 /* Check that clusters are monotone. */
279 if (cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES ||
280 cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
282 bool is_forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
284 unsigned int num_glyphs;
285 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
287 for (unsigned int i = 1; i < num_glyphs; i++)
288 if (info[i-1].cluster != info[i].cluster &&
289 (info[i-1].cluster < info[i].cluster) != is_forward)
292 *error = "clusters are not monotone.";
300 bool verify_buffer_safe_to_break (hb_buffer_t *buffer,
301 hb_buffer_t *text_buffer,
303 const char **error=nullptr)
305 if (cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES &&
306 cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
308 /* Cannot perform this check without monotone clusters.
309 * Then again, unsafe-to-break flag is much harder to use without
310 * monotone clusters. */
314 /* Check that breaking up shaping at safe-to-break is indeed safe. */
316 hb_buffer_t *fragment = hb_buffer_create ();
317 hb_buffer_t *reconstruction = hb_buffer_create ();
318 copy_buffer_properties (reconstruction, buffer);
320 unsigned int num_glyphs;
321 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
323 unsigned int num_chars;
324 hb_glyph_info_t *text = hb_buffer_get_glyph_infos (text_buffer, &num_chars);
326 /* Chop text and shape fragments. */
327 bool forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
328 unsigned int start = 0;
329 unsigned int text_start = forward ? 0 : num_chars;
330 unsigned int text_end = text_start;
331 for (unsigned int end = 1; end < num_glyphs + 1; end++)
333 if (end < num_glyphs &&
334 (info[end].cluster == info[end-1].cluster ||
335 info[end-(forward?0:1)].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK))
338 /* Shape segment corresponding to glyphs start..end. */
339 if (end == num_glyphs)
342 text_end = num_chars;
350 unsigned int cluster = info[end].cluster;
351 while (text_end < num_chars && text[text_end].cluster < cluster)
356 unsigned int cluster = info[end - 1].cluster;
357 while (text_start && text[text_start - 1].cluster >= cluster)
361 assert (text_start < text_end);
364 printf("start %d end %d text start %d end %d\n", start, end, text_start, text_end);
366 hb_buffer_clear_contents (fragment);
367 copy_buffer_properties (fragment, buffer);
369 /* TODO: Add pre/post context text. */
370 hb_buffer_flags_t flags = hb_buffer_get_flags (fragment);
372 flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_BOT);
373 if (text_end < num_chars)
374 flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_EOT);
375 hb_buffer_set_flags (fragment, flags);
377 hb_buffer_append (fragment, text_buffer, text_start, text_end);
378 if (!hb_shape_full (font, fragment, features, num_features, shapers))
381 *error = "all shapers failed while shaping fragment.";
382 hb_buffer_destroy (reconstruction);
383 hb_buffer_destroy (fragment);
386 hb_buffer_append (reconstruction, fragment, 0, -1);
390 text_start = text_end;
392 text_end = text_start;
396 hb_buffer_diff_flags_t diff = hb_buffer_diff (reconstruction, buffer, (hb_codepoint_t) -1, 0);
400 *error = "Safe-to-break test failed.";
403 /* Return the reconstructed result instead so it can be inspected. */
404 hb_buffer_set_length (buffer, 0);
405 hb_buffer_append (buffer, reconstruction, 0, -1);
408 hb_buffer_destroy (reconstruction);
409 hb_buffer_destroy (fragment);
414 void shape_closure (const char *text, int text_len,
415 hb_font_t *font, hb_buffer_t *buffer,
418 hb_buffer_reset (buffer);
419 hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
420 setup_buffer (buffer);
421 hb_ot_shape_glyphs_closure (font, buffer, features, num_features, glyphs);
424 /* Buffer properties */
432 hb_bool_t preserve_default_ignorables;
433 hb_bool_t remove_default_ignorables;
435 hb_feature_t *features;
436 unsigned int num_features;
438 hb_bool_t utf8_clusters;
439 hb_buffer_cluster_level_t cluster_level;
440 hb_bool_t normalize_glyphs;
442 unsigned int num_iterations;
446 struct font_options_t : option_group_t
448 font_options_t (option_parser_t *parser,
449 int default_font_size_,
450 unsigned int subpixel_bits_)
452 variations = nullptr;
454 default_font_size = default_font_size_;
458 subpixel_bits = subpixel_bits_;
461 font_size_x = font_size_y = default_font_size;
462 font_funcs = nullptr;
466 add_options (parser);
468 ~font_options_t (void) {
472 hb_font_destroy (font);
475 void add_options (option_parser_t *parser);
477 hb_font_t *get_font (void) const;
481 hb_variation_t *variations;
482 unsigned int num_variations;
483 int default_font_size;
487 unsigned int subpixel_bits;
488 mutable double font_size_x;
489 mutable double font_size_y;
493 mutable hb_font_t *font;
497 struct text_options_t : option_group_t
499 text_options_t (option_parser_t *parser) {
500 text_before = nullptr;
501 text_after = nullptr;
509 line_len = (unsigned int) -1;
511 add_options (parser);
513 ~text_options_t (void) {
514 g_free (text_before);
519 g_string_free (gs, true);
524 void add_options (option_parser_t *parser);
526 void post_parse (GError **error G_GNUC_UNUSED) {
527 if (text && text_file)
529 G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
530 "Only one of text and text-file can be set");
533 const char *get_line (unsigned int *len);
545 unsigned int line_len;
548 struct output_options_t : option_group_t
550 output_options_t (option_parser_t *parser,
551 const char **supported_formats_ = nullptr) {
552 output_file = nullptr;
553 output_format = nullptr;
554 supported_formats = supported_formats_;
555 explicit_output_format = false;
559 add_options (parser);
561 ~output_options_t (void) {
562 g_free (output_file);
563 g_free (output_format);
568 void add_options (option_parser_t *parser);
570 void post_parse (GError **error G_GNUC_UNUSED)
573 explicit_output_format = true;
575 if (output_file && !output_format) {
576 output_format = strrchr (output_file, '.');
579 output_format++; /* skip the dot */
580 output_format = strdup (output_format);
584 if (output_file && 0 == strcmp (output_file, "-"))
585 output_file = nullptr; /* STDOUT */
588 FILE *get_file_handle (void);
592 const char **supported_formats;
593 bool explicit_output_format;
598 struct format_options_t : option_group_t
600 format_options_t (option_parser_t *parser) {
601 show_glyph_names = true;
602 show_positions = true;
603 show_advances = true;
604 show_clusters = true;
606 show_unicode = false;
607 show_line_num = false;
608 show_extents = false;
612 add_options (parser);
615 void add_options (option_parser_t *parser);
617 void serialize_unicode (hb_buffer_t *buffer,
619 void serialize_glyphs (hb_buffer_t *buffer,
621 hb_buffer_serialize_format_t format,
622 hb_buffer_serialize_flags_t flags,
624 void serialize_line_no (unsigned int line_no,
626 void serialize_buffer_of_text (hb_buffer_t *buffer,
627 unsigned int line_no,
629 unsigned int text_len,
632 void serialize_message (unsigned int line_no,
636 void serialize_buffer_of_glyphs (hb_buffer_t *buffer,
637 unsigned int line_no,
639 unsigned int text_len,
641 hb_buffer_serialize_format_t output_format,
642 hb_buffer_serialize_flags_t format_flags,
646 hb_bool_t show_glyph_names;
647 hb_bool_t show_positions;
648 hb_bool_t show_advances;
649 hb_bool_t show_clusters;
651 hb_bool_t show_unicode;
652 hb_bool_t show_line_num;
653 hb_bool_t show_extents;
654 hb_bool_t show_flags;
658 struct subset_options_t : option_group_t
660 subset_options_t (option_parser_t *parser)
664 add_options (parser);
667 void add_options (option_parser_t *parser);
669 hb_bool_t drop_hints;
672 /* fallback implementation for scalbn()/scalbnf() for pre-2013 MSVC */
673 #if defined (_MSC_VER) && (_MSC_VER < 1800)
679 __inline long double scalbn (long double x, int exp)
681 return x * (pow ((long double) FLT_RADIX, exp));
684 __inline float scalbnf (float x, int exp)
686 return x * (pow ((float) FLT_RADIX, exp));