diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-utf.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-utf.hh | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-utf.hh b/src/3rdparty/harfbuzz-ng/src/hb-utf.hh index ff5712d16d..1120bd1ccc 100644 --- a/src/3rdparty/harfbuzz-ng/src/hb-utf.hh +++ b/src/3rdparty/harfbuzz-ng/src/hb-utf.hh @@ -35,6 +35,7 @@ struct hb_utf8_t { typedef uint8_t codepoint_t; + static constexpr unsigned max_len = 4; static const codepoint_t * next (const codepoint_t *text, @@ -182,6 +183,7 @@ struct hb_utf16_xe_t { static_assert (sizeof (TCodepoint) == 2, ""); typedef TCodepoint codepoint_t; + static constexpr unsigned max_len = 2; static const codepoint_t * next (const codepoint_t *text, @@ -290,6 +292,7 @@ struct hb_utf32_xe_t { static_assert (sizeof (TCodepoint) == 4, ""); typedef TCodepoint codepoint_t; + static constexpr unsigned max_len = 1; static const TCodepoint * next (const TCodepoint *text, @@ -348,6 +351,7 @@ typedef hb_utf32_xe_t<uint32_t, false> hb_utf32_novalidate_t; struct hb_latin1_t { typedef uint8_t codepoint_t; + static constexpr unsigned max_len = 1; static const codepoint_t * next (const codepoint_t *text, @@ -399,12 +403,13 @@ struct hb_latin1_t struct hb_ascii_t { typedef uint8_t codepoint_t; + static constexpr unsigned max_len = 1; static const codepoint_t * next (const codepoint_t *text, const codepoint_t *end HB_UNUSED, hb_codepoint_t *unicode, - hb_codepoint_t replacement HB_UNUSED) + hb_codepoint_t replacement) { *unicode = *text++; if (*unicode >= 0x0080u) @@ -450,4 +455,27 @@ struct hb_ascii_t } }; +template <typename utf_t> +static inline const typename utf_t::codepoint_t * +hb_utf_offset_to_pointer (const typename utf_t::codepoint_t *start, + signed offset) +{ + hb_codepoint_t unicode; + + while (offset-- > 0) + start = utf_t::next (start, + start + utf_t::max_len, + &unicode, + HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT); + + while (offset++ < 0) + start = utf_t::prev (start, + start - utf_t::max_len, + &unicode, + HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT); + + return start; +} + + #endif /* HB_UTF_HH */ |