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Diffstat (limited to 'gfx/harfbuzz/src/hb-shape.cc')
| -rw-r--r-- | gfx/harfbuzz/src/hb-shape.cc | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-shape.cc b/gfx/harfbuzz/src/hb-shape.cc new file mode 100644 index 0000000000..7b5bf2c5ef --- /dev/null +++ b/gfx/harfbuzz/src/hb-shape.cc @@ -0,0 +1,199 @@ +/* + * 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" + + +#ifndef HB_NO_SHAPER + +/** + * 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); +} + + +#endif |