[Git][freetype/freetype][master] Expand comment (cont'd).

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType

Commits:

• 3785393d
  by Alexei Podtelezhnikov at 2021-08-26T15:31:11+00:00

  Expand comment (cont'd).

1 changed file:

• src/smooth/ftgrays.c

Changes:

src/smooth/ftgrays.c

---

...	...	@@ -380,6 +380,12 @@ typedef ptrdiff_t FT_PtrDist;
380	380	/* each slanted line. Nevertheless, these divisions are noticeable */
381	381	/* in the overall performance because flattened curves produce a */
382	382	/* very large number of slanted lines. */
	383	+ /* */
	384	+ /* The division results here are always within ONE_PIXEL. Therefore */
	385	+ /* the shift magnitude should be at least PIXEL_BITS wider than the */
	386	+ /* divisors to provide sufficient accuracy of the multiply-shift. */
	387	+ /* It should not exceed (64 - PIXEL_BITS) to prevent overflowing and */
	388	+ /* leave enough room for 64-bit unsigned multiplication however. */
383	389	#define FT_UDIVPREP( c, b ) \
384	390	FT_Int64 b ## _r = c ? (FT_Int64)( ~(FT_UInt64)0 >> PIXEL_BITS ) / ( b ) \
385	391	: 0

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