diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-shape.cc')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-shape.cc | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-shape.cc b/src/3rdparty/harfbuzz-ng/src/hb-shape.cc new file mode 100644 index 0000000000..c28fdfa254 --- /dev/null +++ b/src/3rdparty/harfbuzz-ng/src/hb-shape.cc @@ -0,0 +1,275 @@ +/* + * 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-private.hh" + +#include "hb-shaper-private.hh" +#include "hb-shape-plan-private.hh" +#include "hb-buffer-private.hh" +#include "hb-font-private.hh" + + +static void +parse_space (const char **pp, const char *end) +{ + char c; + while (*pp < end && (c = **pp, ISSPACE (c))) + (*pp)++; +} + +static hb_bool_t +parse_char (const char **pp, const char *end, char c) +{ + parse_space (pp, end); + + if (*pp == end || **pp != c) + return false; + + (*pp)++; + return true; +} + +static hb_bool_t +parse_uint (const char **pp, const char *end, unsigned int *pv) +{ + char buf[32]; + unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - *pp)); + strncpy (buf, *pp, len); + buf[len] = '\0'; + + char *p = buf; + char *pend = p; + unsigned int v; + + /* Intentionally use strtol instead of strtoul, such that + * -1 turns into "big number"... */ + errno = 0; + v = strtol (p, &pend, 0); + if (errno || p == pend) + return false; + + *pv = v; + *pp += pend - p; + return true; +} + +static hb_bool_t +parse_feature_value_prefix (const char **pp, const char *end, hb_feature_t *feature) +{ + if (parse_char (pp, end, '-')) + feature->value = 0; + else { + parse_char (pp, end, '+'); + feature->value = 1; + } + + return true; +} + +static hb_bool_t +parse_feature_tag (const char **pp, const char *end, hb_feature_t *feature) +{ + const char *p = *pp; + char c; + + parse_space (pp, end); + +#define ISALNUM(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z') || ('0' <= (c) && (c) <= '9')) + while (*pp < end && (c = **pp, ISALNUM(c))) + (*pp)++; +#undef ISALNUM + + if (p == *pp) + return false; + + feature->tag = hb_tag_from_string (p, *pp - p); + return true; +} + +static hb_bool_t +parse_feature_indices (const char **pp, const char *end, hb_feature_t *feature) +{ + parse_space (pp, end); + + hb_bool_t has_start; + + feature->start = 0; + feature->end = (unsigned int) -1; + + if (!parse_char (pp, end, '[')) + return true; + + has_start = parse_uint (pp, end, &feature->start); + + if (parse_char (pp, end, ':')) { + parse_uint (pp, end, &feature->end); + } else { + if (has_start) + feature->end = feature->start + 1; + } + + return parse_char (pp, end, ']'); +} + +static hb_bool_t +parse_feature_value_postfix (const char **pp, const char *end, hb_feature_t *feature) +{ + return !parse_char (pp, end, '=') || parse_uint (pp, end, &feature->value); +} + + +static hb_bool_t +parse_one_feature (const char **pp, const char *end, hb_feature_t *feature) +{ + return parse_feature_value_prefix (pp, end, feature) && + parse_feature_tag (pp, end, feature) && + parse_feature_indices (pp, end, feature) && + parse_feature_value_postfix (pp, end, feature) && + *pp == end; +} + +hb_bool_t +hb_feature_from_string (const char *str, int len, + hb_feature_t *feature) +{ + if (len < 0) + len = strlen (str); + + return parse_one_feature (&str, str + len, feature); +} + +void +hb_feature_to_string (hb_feature_t *feature, + char *buf, unsigned int size) +{ + if (unlikely (!size)) return; + + char s[128]; + unsigned int len = 0; + if (feature->value == 0) + s[len++] = '-'; + hb_tag_to_string (feature->tag, s + len); + len += 4; + while (len && s[len - 1] == ' ') + len--; + if (feature->start != 0 || feature->end != (unsigned int) -1) + { + s[len++] = '['; + if (feature->start) + len += snprintf (s + len, ARRAY_LENGTH (s) - len, "%d", feature->start); + if (feature->end != feature->start + 1) { + s[len++] = ':'; + if (feature->end != (unsigned int) -1) + len += snprintf (s + len, ARRAY_LENGTH (s) - len, "%d", feature->end); + } + s[len++] = ']'; + } + if (feature->value > 1) + { + s[len++] = '='; + len += snprintf (s + len, ARRAY_LENGTH (s) - len, "%d", feature->value); + } + assert (len < ARRAY_LENGTH (s)); + len = MIN (len, size - 1); + memcpy (buf, s, len); + buf[len] = '\0'; +} + + +static const char **static_shaper_list; + +static inline +void free_static_shaper_list (void) +{ + free (static_shaper_list); +} + +const char ** +hb_shape_list_shapers (void) +{ +retry: + const char **shaper_list = (const char **) hb_atomic_ptr_get (&static_shaper_list); + + if (unlikely (!shaper_list)) + { + /* Not found; allocate one. */ + shaper_list = (const char **) calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *)); + if (unlikely (!shaper_list)) { + static const char *nil_shaper_list[] = {NULL}; + return nil_shaper_list; + } + + const hb_shaper_pair_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] = NULL; + + if (!hb_atomic_ptr_cmpexch (&static_shaper_list, NULL, shaper_list)) { + free (shaper_list); + goto retry; + } + +#ifdef HAVE_ATEXIT + atexit (free_static_shaper_list); /* First person registers atexit() callback. */ +#endif + } + + return shaper_list; +} + + +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; + + assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_UNICODE); + + hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props, features, num_features, shaper_list); + hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features); + hb_shape_plan_destroy (shape_plan); + + if (res) + buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS; + return res; +} + +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, NULL); +} |