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Merge pull request #167 from KonstantinRitt/unicode_cp_opt 

Micro optimizations to UTF-16 and UTF-32 codecs
This commit is contained in:
Behdad Esfahbod 2015-11-07 07:50:58 -08:00
parent 04ff23e73d 529a933128
commit d5f0d7c9fb
1 changed files with 25 additions and 21 deletions
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40
src/hb-utf-private.hh
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@ -146,11 +146,11 @@ struct hb_utf16_t
return text;
}
if (likely (hb_in_range (c, 0xD800u, 0xDBFFu)))
if (likely (c <= 0xDBFFu && text < end))
{
/* High-surrogate in c */
hb_codepoint_t l;
if (text < end && ((l = *text), likely (hb_in_range (l, 0xDC00u, 0xDFFFu))))
hb_codepoint_t l = *text;
if (likely (hb_in_range (l, 0xDC00u, 0xDFFFu)))
{
/* Low-surrogate in l */
*unicode = (c << 10) + l - ((0xD800u << 10) - 0x10000u + 0xDC00u);
@ -170,8 +170,7 @@ struct hb_utf16_t
hb_codepoint_t *unicode,
hb_codepoint_t replacement)
{
const uint16_t *end = text--;
hb_codepoint_t c = *text;
hb_codepoint_t c = *--text;
if (likely (!hb_in_range (c, 0xD800u, 0xDFFFu)))
{
@ -179,14 +178,22 @@ struct hb_utf16_t
return text;
}
if (likely (start < text && hb_in_range (c, 0xDC00u, 0xDFFFu)))
if (likely (c >= 0xDC00u && start < text))
{
/* Low-surrogate in c */
hb_codepoint_t h = text[-1];
if (likely (hb_in_range (h, 0xD800u, 0xDBFFu)))
{
/* High-surrogate in h */
*unicode = (h << 10) + c - ((0xD800u << 10) - 0x10000u + 0xDC00u);
text--;
if (likely (next (text, end, unicode, replacement) == end))
return text;
}
}
/* Lonely / out-of-order surrogate. */
*unicode = replacement;
return end - 1;
return text;
}
@ -211,13 +218,8 @@ struct hb_utf32_t
hb_codepoint_t *unicode,
hb_codepoint_t replacement)
{
hb_codepoint_t c = *text++;
if (validate && unlikely (c > 0x10FFFFu || hb_in_range (c, 0xD800u, 0xDFFFu)))
goto error;
*unicode = c;
return text;
error:
hb_codepoint_t c = *unicode = *text++;
if (validate && unlikely (c >= 0xD800u && (c <= 0xDFFFu || c > 0x10FFFFu)))
*unicode = replacement;
return text;
}
@ -228,8 +230,10 @@ struct hb_utf32_t
hb_codepoint_t *unicode,
hb_codepoint_t replacement)
{
next (text - 1, text, unicode, replacement);
return text - 1;
hb_codepoint_t c = *unicode = *--text;
if (validate && unlikely (c >= 0xD800u && (c <= 0xDFFFu || c > 0x10FFFFu)))
*unicode = replacement;
return text;
}
static inline unsigned int