| /* |
| * Copyright © 2009 Red Hat, Inc. |
| * Copyright © 2012 Google, Inc. |
| * |
| * This is part of HarfBuzz, a text shaping library. |
| * |
| * Permission is hereby granted, without written agreement and without |
| * license or royalty fees, to use, copy, modify, and distribute this |
| * software and its documentation for any purpose, provided that the |
| * above copyright notice and the following two paragraphs appear in |
| * all copies of this software. |
| * |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| * |
| * Red Hat Author(s): Behdad Esfahbod |
| * Google Author(s): Behdad Esfahbod |
| */ |
| |
| #include "hb.hh" |
| |
| #include "hb-shaper.hh" |
| #include "hb-shape-plan.hh" |
| #include "hb-buffer.hh" |
| #include "hb-font.hh" |
| #include "hb-machinery.hh" |
| |
| |
| /** |
| * SECTION:hb-shape |
| * @title: hb-shape |
| * @short_description: Conversion of text strings into positioned glyphs |
| * @include: hb.h |
| * |
| * Shaping is the central operation of HarfBuzz. Shaping operates on buffers, |
| * which are sequences of Unicode characters that use the same font and have |
| * the same text direction, script, and language. After shaping the buffer |
| * contains the output glyphs and their positions. |
| **/ |
| |
| |
| static inline void free_static_shaper_list (); |
| |
| static const char * const nil_shaper_list[] = {nullptr}; |
| |
| static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *, |
| hb_shaper_list_lazy_loader_t> |
| { |
| static const char ** create () |
| { |
| const char **shaper_list = (const char **) hb_calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *)); |
| if (unlikely (!shaper_list)) |
| return nullptr; |
| |
| const hb_shaper_entry_t *shapers = _hb_shapers_get (); |
| unsigned int i; |
| for (i = 0; i < HB_SHAPERS_COUNT; i++) |
| shaper_list[i] = shapers[i].name; |
| shaper_list[i] = nullptr; |
| |
| hb_atexit (free_static_shaper_list); |
| |
| return shaper_list; |
| } |
| static void destroy (const char **l) |
| { hb_free (l); } |
| static const char * const * get_null () |
| { return nil_shaper_list; } |
| } static_shaper_list; |
| |
| static inline |
| void free_static_shaper_list () |
| { |
| static_shaper_list.free_instance (); |
| } |
| |
| |
| /** |
| * hb_shape_list_shapers: |
| * |
| * Retrieves the list of shapers supported by HarfBuzz. |
| * |
| * Return value: (transfer none) (array zero-terminated=1): an array of |
| * constant strings |
| * |
| * Since: 0.9.2 |
| **/ |
| const char ** |
| hb_shape_list_shapers () |
| { |
| return static_shaper_list.get_unconst (); |
| } |
| |
| |
| /** |
| * hb_shape_full: |
| * @font: an #hb_font_t to use for shaping |
| * @buffer: an #hb_buffer_t to shape |
| * @features: (array length=num_features) (nullable): an array of user |
| * specified #hb_feature_t or `NULL` |
| * @num_features: the length of @features array |
| * @shaper_list: (array zero-terminated=1) (nullable): a `NULL`-terminated |
| * array of shapers to use or `NULL` |
| * |
| * See hb_shape() for details. If @shaper_list is not `NULL`, the specified |
| * shapers will be used in the given order, otherwise the default shapers list |
| * will be used. |
| * |
| * Return value: false if all shapers failed, true otherwise |
| * |
| * Since: 0.9.2 |
| **/ |
| hb_bool_t |
| hb_shape_full (hb_font_t *font, |
| hb_buffer_t *buffer, |
| const hb_feature_t *features, |
| unsigned int num_features, |
| const char * const *shaper_list) |
| { |
| if (unlikely (!buffer->len)) |
| return true; |
| |
| buffer->enter (); |
| |
| hb_buffer_t *text_buffer = nullptr; |
| if (buffer->flags & HB_BUFFER_FLAG_VERIFY) |
| { |
| text_buffer = hb_buffer_create (); |
| hb_buffer_append (text_buffer, buffer, 0, -1); |
| } |
| |
| hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached2 (font->face, &buffer->props, |
| features, num_features, |
| font->coords, font->num_coords, |
| shaper_list); |
| |
| hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features); |
| |
| if (buffer->max_ops <= 0) |
| buffer->shaping_failed = true; |
| |
| hb_shape_plan_destroy (shape_plan); |
| |
| if (text_buffer) |
| { |
| if (res && buffer->successful && !buffer->shaping_failed |
| && text_buffer->successful |
| && !buffer->verify (text_buffer, |
| font, |
| features, |
| num_features, |
| shaper_list)) |
| res = false; |
| hb_buffer_destroy (text_buffer); |
| } |
| |
| buffer->leave (); |
| |
| return res; |
| } |
| |
| /** |
| * hb_shape: |
| * @font: an #hb_font_t to use for shaping |
| * @buffer: an #hb_buffer_t to shape |
| * @features: (array length=num_features) (nullable): an array of user |
| * specified #hb_feature_t or `NULL` |
| * @num_features: the length of @features array |
| * |
| * Shapes @buffer using @font turning its Unicode characters content to |
| * positioned glyphs. If @features is not `NULL`, it will be used to control the |
| * features applied during shaping. If two @features have the same tag but |
| * overlapping ranges the value of the feature with the higher index takes |
| * precedence. |
| * |
| * Since: 0.9.2 |
| **/ |
| void |
| hb_shape (hb_font_t *font, |
| hb_buffer_t *buffer, |
| const hb_feature_t *features, |
| unsigned int num_features) |
| { |
| hb_shape_full (font, buffer, features, num_features, nullptr); |
| } |