[Git][freetype/freetype][master] * src/base/ftcalc.c /* FT_SqrtFixed */: Fix defunct overflow.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType

Commits:

• babe6af1
  by Alexei Podtelezhnikov at 2023-09-18T15:01:26+00:00

  * src/base/ftcalc.c /* FT_SqrtFixed */: Fix defunct overflow.

1 changed file:

• src/base/ftcalc.c

Changes:

src/base/ftcalc.c

---

...	...	@@ -917,17 +917,18 @@
917	917
918	918	/* documentation is in ftcalc.h */
919	919
920		- /* Algorithm and code by Christophe Meessen (1993). */
	920	+ /* Algorithm and code by Christophe Meessen (1993) */
	921	+ /* with overflow fixed. */
921	922	FT_BASE_DEF( FT_UInt32 )
922		- FT_SqrtFixed( FT_UInt32 r )
	923	+ FT_SqrtFixed( FT_UInt32 v )
923	924	{
924		- FT_UInt32 t, q, b;
	925	+ FT_UInt32 r = v >> 1;
	926	+ FT_UInt32 q = ( v & 1 ) << 15;
	927	+ FT_UInt32 b = 0x20000000;
	928	+ FT_UInt32 t;
925	929
926	930
927		- q = 0;
928		-
929		- b = 0x40000000;
930		- while ( b > 0x40 )
	931	+ do
931	932	{
932	933	t = q + b;
933	934	if ( r >= t )
...	...	@@ -938,8 +939,9 @@
938	939	r <<= 1;
939	940	b >>= 1;
940	941	}
	942	+ while ( b > 0x20 );
941	943
942		- return q >> 8;
	944	+ return q >> 7;
943	945	}
944	946
945	947	#endif /* 0 */

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