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