Commit 53ae7a542dd7c7b36168cdddb120ef3e0ab97f43
2016-09-22T22:48:15
[smooth] Reduce divisions in the line renderer. We don't need some divisions if a line segments stays within a single row or a single column of pixels. * src/smooth/ftgrays.c (gray_render_line) [FT_LONG64]: Make divisions conditional.
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diff --git a/ChangeLog b/ChangeLog
index e79dce8..e698225 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2016-09-22 Alexei Podtelezhnikov <apodtele@gmail.com>
+
+ [smooth] Reduce divisions in the line renderer.
+
+ We don't need some divisions if a line segments stays within a single
+ row or a single column of pixels.
+
+ * src/smooth/ftgrays.c (gray_render_line) [FT_LONG64]: Make divisions
+ conditional.
+
2016-09-15 Alexei Podtelezhnikov <apodtele@gmail.com>
* src/smooth/ftgrays.c (gray_sweep): Remove check for empty table.
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c
index 75108da..7558312 100644
--- a/src/smooth/ftgrays.c
+++ b/src/smooth/ftgrays.c
@@ -371,8 +371,9 @@ typedef ptrdiff_t FT_PtrDist;
/* These macros speed up repetitive divisions by replacing them */
/* with multiplications and right shifts. */
-#define FT_UDIVPREP( b ) \
- long b ## _r = (long)( FT_ULONG_MAX >> PIXEL_BITS ) / ( b )
+#define FT_UDIVPREP( c, b ) \
+ long b ## _r = c ? (long)( FT_ULONG_MAX >> PIXEL_BITS ) / ( b ) \
+ : 0
#define FT_UDIV( a, b ) \
( ( (unsigned long)( a ) * (unsigned long)( b ## _r ) ) >> \
( sizeof( long ) * FT_CHAR_BIT - PIXEL_BITS ) )
@@ -890,8 +891,8 @@ typedef ptrdiff_t FT_PtrDist;
else /* any other line */
{
TPos prod = dx * fy1 - dy * fx1;
- FT_UDIVPREP( dx );
- FT_UDIVPREP( dy );
+ FT_UDIVPREP( ex1 != ex2, dx );
+ FT_UDIVPREP( ey1 != ey2, dy );
/* The fundamental value `prod' determines which side and the */