1 files changed, 68 insertions, 1 deletions
diff --git a/src/3rdparty/freetype/src/base/ftcalc.c b/src/3rdparty/freetype/src/base/ftcalc.c
index 6c1e7fbd45..13e74f3353 100644
--- a/src/3rdparty/freetype/src/base/ftcalc.c
+++ b/src/3rdparty/freetype/src/base/ftcalc.c
@@ -4,7 +4,7 @@
  *
  *   Arithmetic computations (body).
  *
- * Copyright (C) 1996-2022 by
+ * Copyright (C) 1996-2023 by
  * David Turner, Robert Wilhelm, and Werner Lemberg.
  *
  * This file is part of the FreeType project, and may only be used,
@@ -1085,4 +1085,71 @@
   }
 
 
+  FT_BASE_DEF( FT_Int32 )
+  FT_MulAddFix( FT_Fixed*  s,
+                FT_Int32*  f,
+                FT_UInt    count )
+  {
+    FT_UInt   i;
+    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 + 0x8000 ) >> 16;
+#else
+    temp.hi = 0;
+    temp.lo = 0;
+
+    for ( i = 0; i < count; ++i )
+    {
+      FT_Int64  multResult;
+
+      FT_Int     sign  = 1;
+      FT_UInt32  carry = 0;
+
+      FT_UInt32  scalar;
+      FT_UInt32  factor;
+
+
+      scalar = (FT_UInt32)s[i];
+      factor = (FT_UInt32)f[i];
+
+      FT_MOVE_SIGN( s[i], scalar, sign );
+      FT_MOVE_SIGN( f[i], factor, sign );
+
+      ft_multo64( scalar, factor, &multResult );
+
+      if ( sign < 0 )
+      {
+        /* Emulated `FT_Int64` negation. */
+        carry = ( multResult.lo == 0 );
+
+        multResult.lo = ~multResult.lo + 1;
+        multResult.hi = ~multResult.hi + carry;
+      }
+
+      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 )            );
+
+#endif /* !FT_INT64 */
+
+  }
+
+
 /* END */