* Google Author(s): Behdad Esfahbod
*/
-#include "hb-private.hh"
+#include "hb.hh"
-#include "hb-shaper-private.hh"
-#include "hb-shape-plan-private.hh"
-#include "hb-buffer-private.hh"
-#include "hb-font-private.hh"
+#include "hb-shaper.hh"
+#include "hb-shape-plan.hh"
+#include "hb-buffer.hh"
+#include "hb-font.hh"
+#include "hb-machinery.hh"
-static bool
-parse_space (const char **pp, const char *end)
-{
- while (*pp < end && ISSPACE (**pp))
- (*pp)++;
- return true;
-}
-
-static bool
-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 bool
-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 bool
-parse_bool (const char **pp, const char *end, unsigned int *pv)
-{
- parse_space (pp, end);
-
- const char *p = *pp;
- while (*pp < end && ISALPHA(**pp))
- (*pp)++;
-
- /* CSS allows on/off as aliases 1/0. */
- if (*pp - p == 2 || 0 == strncmp (p, "on", 2))
- *pv = 1;
- else if (*pp - p == 3 || 0 == strncmp (p, "off", 2))
- *pv = 0;
- else
- return false;
-
- return true;
-}
-
-static bool
-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 bool
-parse_feature_tag (const char **pp, const char *end, hb_feature_t *feature)
-{
- parse_space (pp, end);
-
- char quote = 0;
-
- if (*pp < end && (**pp == '\'' || **pp == '"'))
- {
- quote = **pp;
- (*pp)++;
- }
-
- const char *p = *pp;
- while (*pp < end && ISALNUM(**pp))
- (*pp)++;
-
- if (p == *pp || *pp - p > 4)
- return false;
-
- feature->tag = hb_tag_from_string (p, *pp - p);
-
- if (quote)
- {
- /* CSS expects exactly four bytes. And we only allow quotations for
- * CSS compatibility. So, enforce the length. */
- if (*pp - p != 4)
- return false;
- if (*pp == end || **pp != quote)
- return false;
- (*pp)++;
- }
-
- return true;
-}
-
-static bool
-parse_feature_indices (const char **pp, const char *end, hb_feature_t *feature)
-{
- parse_space (pp, end);
-
- bool 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 bool
-parse_feature_value_postfix (const char **pp, const char *end, hb_feature_t *feature)
-{
- bool had_equal = parse_char (pp, end, '=');
- bool had_value = parse_uint (pp, end, &feature->value) ||
- parse_bool (pp, end, &feature->value);
- /* CSS doesn't use equal-sign between tag and value.
- * If there was an equal-sign, then there *must* be a value.
- * A value without an eqaul-sign is ok, but not required. */
- return !had_equal || had_value;
-}
-
-
-static bool
-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) &&
- parse_space (pp, end) &&
- *pp == end;
-}
-
/**
- * hb_feature_from_string:
- * @str: (array length=len):
- * @len:
- * @feature: (out) (optional):
- *
- *
- *
- * Return value:
- *
- * Since: 1.0
+ * 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.
**/
-hb_bool_t
-hb_feature_from_string (const char *str, int len,
- hb_feature_t *feature)
-{
- hb_feature_t feat;
- if (len < 0)
- len = strlen (str);
- if (likely (parse_one_feature (&str, str + len, &feat)))
- {
- if (feature)
- *feature = feat;
- return true;
- }
+#if HB_USE_ATEXIT
+static void free_static_shaper_list ();
+#endif
- if (feature)
- memset (feature, 0, sizeof (*feature));
- return false;
-}
+static const char *nil_shaper_list[] = {nullptr};
-/**
- * hb_feature_to_string:
- * @feature:
- * @buf: (array length=size):
- * @size:
- *
- *
- *
- * Since: 1.0
- **/
-void
-hb_feature_to_string (hb_feature_t *feature,
- char *buf, unsigned int size)
+static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *,
+ hb_shaper_list_lazy_loader_t>
{
- 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)
+ static const char ** create ()
{
- s[len++] = '[';
- if (feature->start)
- len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->start));
- if (feature->end != feature->start + 1) {
- s[len++] = ':';
- if (feature->end != (unsigned int) -1)
- len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->end));
- }
- s[len++] = ']';
- }
- if (feature->value > 1)
- {
- s[len++] = '=';
- len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->value));
- }
- assert (len < ARRAY_LENGTH (s));
- len = MIN (len, size - 1);
- memcpy (buf, s, len);
- buf[len] = '\0';
-}
+ const char **shaper_list = (const char **) 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;
+#if HB_USE_ATEXIT
+ atexit (free_static_shaper_list);
+#endif
-static const char **static_shaper_list;
+ return shaper_list;
+ }
+ static void destroy (const char **l)
+ { free (l); }
+ static const char ** get_null ()
+ { return nil_shaper_list; }
+} static_shaper_list;
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
static
-void free_static_shaper_list (void)
+void free_static_shaper_list ()
{
- free (static_shaper_list);
+ static_shaper_list.free_instance ();
}
#endif
+
/**
* hb_shape_list_shapers:
*
- *
+ * Retrieves the list of shapers supported by HarfBuzz.
*
- * Return value: (transfer none):
+ * Return value: (transfer none) (array zero-terminated=1): an array of
+ * constant strings
*
- * Since: 1.0
+ * Since: 0.9.2
**/
const char **
-hb_shape_list_shapers (void)
+hb_shape_list_shapers ()
{
-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 HB_USE_ATEXIT
- atexit (free_static_shaper_list); /* First person registers atexit() callback. */
-#endif
- }
-
- return shaper_list;
+ return static_shaper_list.get_unconst ();
}
/**
* hb_shape_full:
- * @font: a font.
- * @buffer: a buffer.
- * @features: (array length=num_features):
- * @num_features:
- * @shaper_list: (array zero-terminated=1):
+ * @font: an #hb_font_t to use for shaping
+ * @buffer: an #hb_buffer_t to shape
+ * @features: (array length=num_features) (allow-none): an array of user
+ * specified #hb_feature_t or %NULL
+ * @num_features: the length of @features array
+ * @shaper_list: (array zero-terminated=1) (allow-none): 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:
+ * Return value: false if all shapers failed, true otherwise
*
- * Since: 1.0
+ * Since: 0.9.2
**/
hb_bool_t
hb_shape_full (hb_font_t *font,
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_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);
hb_shape_plan_destroy (shape_plan);
/**
* hb_shape:
- * @font: a font.
- * @buffer: a buffer.
- * @features: (array length=num_features):
- * @num_features:
+ * @font: an #hb_font_t to use for shaping
+ * @buffer: an #hb_buffer_t to shape
+ * @features: (array length=num_features) (allow-none): 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.
*
- * Since: 1.0
+ * Since: 0.9.2
**/
void
hb_shape (hb_font_t *font,
const hb_feature_t *features,
unsigned int num_features)
{
- hb_shape_full (font, buffer, features, num_features, NULL);
+ hb_shape_full (font, buffer, features, num_features, nullptr);
}
projects / platform / upstream / harfbuzz.git / blobdiff