C++ (Cpp) utf16_to_code_point_prev Examples

Example #1

File: harfbuzz-unicode.c Project: TeamNyx/external_harfbuzz

char
hb_utf16_script_run_prev(unsigned *num_code_points, HB_ScriptItem *output,
                         const uint16_t *chars, size_t len, ssize_t *iter) {
  if (*iter == (size_t) -1)
    return 0;

  const size_t ending_index = *iter;
  const uint32_t init_cp = utf16_to_code_point_prev(chars, len, iter);
  unsigned cps = 1;
  if (init_cp == HB_InvalidCodePoint)
    return 0;
  const HB_Script init_script = code_point_to_script(init_cp);
  HB_Script current_script = init_script;
  output->script = init_script;

  for (;;) {
    if (*iter < 0)
      break;
    const ssize_t prev_iter = *iter;
    const uint32_t cp = utf16_to_code_point_prev(chars, len, iter);
    if (cp == HB_InvalidCodePoint)
      return 0;
    cps++;
    const HB_Script script = code_point_to_script(cp);

    if (script != current_script) {
      if (current_script == HB_Script_Inherited && init_script == HB_Script_Inherited) {
        // If we started off as inherited, we take whatever we can find.
        output->script = script;
        current_script = script;
        continue;
      } else if (script == HB_Script_Inherited) {
        /* BEGIN android-changed
           We apply the same fix for Chrome to Android.
           Chrome team will talk with upsteam about it.
           Just assume that whatever follows this combining character is within
           the same script.  This is incorrect if you had language1 + combining
           char + language 2, but that is rare and this code is suspicious
           anyway.
           END android-changed */
        continue;
      } else {
        *iter = prev_iter;
        cps--;
        break;
      }
    }
  }

  if (output->script == HB_Script_Inherited)
    output->script = HB_Script_Common;

  output->pos = *iter + 1;
  output->length = ending_index - *iter;
  if (num_code_points)
    *num_code_points = cps;
  return 1;
}

Example #2

File: harfbuzz-unicode.c Project: Zahnstocher/OsmAnd-external-harfbuzz-legacy

char
hb_utf16_script_run_prev(unsigned *num_code_points, HB_ScriptItem *output,
                         const uint16_t *chars, size_t len, ssize_t *iter) {
  if (*iter == (size_t) -1)
    return 0;

  const size_t ending_index = *iter;
  const uint32_t init_cp = utf16_to_code_point_prev(chars, len, iter);
  unsigned cps = 1;
  if (init_cp == HB_InvalidCodePoint)
    return 0;
  const HB_Script init_script = code_point_to_script(init_cp);
  HB_Script current_script = init_script;
  output->script = init_script;

  for (;;) {
    if (*iter < 0)
      break;
    const ssize_t prev_iter = *iter;
    const uint32_t cp = utf16_to_code_point_prev(chars, len, iter);
    if (cp == HB_InvalidCodePoint)
      return 0;
    cps++;
    const HB_Script script = code_point_to_script(cp);

    if (script != current_script) {
      if (current_script == HB_Script_Inherited && init_script == HB_Script_Inherited) {
        // If we started off as inherited, we take whatever we can find.
        output->script = script;
        current_script = script;
        continue;
      } else if (script == HB_Script_Inherited) {
        current_script = script;
        continue;
      } else {
        *iter = prev_iter;
        cps--;
        break;
      }
    }
  }

  if (output->script == HB_Script_Inherited)
    output->script = HB_Script_Common;

  output->pos = *iter + 1;
  output->length = ending_index - *iter;
  if (num_code_points)
    *num_code_points = cps;
  return 1;
}