[Git][freetype/freetype][master] Expand comment.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType

Commits:

• 686e2a5e
  by Alexei Podtelezhnikov at 2021-08-25T23:18:43+00:00

  Expand comment.

1 changed file:

• src/smooth/ftgrays.c

Changes:

src/smooth/ftgrays.c

---

...	...	@@ -373,8 +373,13 @@ typedef ptrdiff_t FT_PtrDist;
373	373	#endif /* __arm__ */
374	374
375	375
376		- /* These macros speed up repetitive divisions by replacing them */
377		- /* with multiplications and right shifts. */
	376	+ /* Calculating coverages for a slanted line requires a division each */
	377	+ /* time the line crosses from cell to cell. These macros speed up */
	378	+ /* the repetitive divisions by replacing them with multiplications */
	379	+ /* and right shifts so that at most two divisions are performed for */
	380	+ /* each slanted line. Nevertheless, these divisions are noticeable */
	381	+ /* in the overall performance because flattened curves produce a */
	382	+ /* very large number of slanted lines. */
378	383	#define FT_UDIVPREP( c, b ) \
379	384	FT_Int64 b ## _r = c ? (FT_Int64)( ~(FT_UInt64)0 >> PIXEL_BITS ) / ( b ) \
380	385	: 0

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