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[freetype2] master bec4ef415: [base] Round values in `FT_MulAdd_Fix`.
From: |
Werner Lemberg |
Subject: |
[freetype2] master bec4ef415: [base] Round values in `FT_MulAdd_Fix`. |
Date: |
Fri, 1 Jul 2022 08:02:11 -0400 (EDT) |
branch: master
commit bec4ef415ef07ad1fa9542978136d9863dd7a6d0
Author: Dominik Röttsches <drott@chromium.org>
Commit: Werner Lemberg <wl@gnu.org>
[base] Round values in `FT_MulAdd_Fix`.
This avoids regressing Blink layout tests and makes `FT_MulAdd_Fix` delta
retrieval implementation consistent with the previous implementation, which
used `FT_fixedToInt` and included rounding.
* src/base/ftcalc.c (FT_MulAdd_Fix): Implement it.
Also fix remaining `temp` initialization compilation issue.
Fixes #1169.
---
src/base/ftcalc.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/src/base/ftcalc.c b/src/base/ftcalc.c
index 34170a582..55d2f7cc8 100644
--- a/src/base/ftcalc.c
+++ b/src/base/ftcalc.c
@@ -1091,18 +1091,20 @@
FT_UInt count )
{
FT_UInt i;
- FT_Int64 temp = 0;
+ FT_Int64 temp;
+#ifndef FT_INT64
+ FT_Int64 halfUnit;
+#endif
#ifdef FT_INT64
+ temp = 0;
for ( i = 0; i < count; ++i )
temp += (FT_Int64)s[i] * f[i];
- return temp >> 16;
-
+ return ( temp + 0x8000 ) >> 16;
#else
-
temp.hi = 0;
temp.lo = 0;
@@ -1137,6 +1139,11 @@
FT_Add64( &temp, &multResult, &temp );
}
+ /* Round value. */
+ halfUnit.hi = 0;
+ halfUnit.lo = 0x8000;
+ FT_Add64( &temp, &halfUnit, &temp );
+
return (FT_Int32)( ( (FT_Int32)( temp.hi & 0xFFFF ) << 16 ) |
( temp.lo >> 16 ) );
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