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[smooth] Streamline pixmap drawing a bit more. 

Zero coverage is unlikely (1 out of 256) to warrant checking. This
gives 0.5% speed improvement in dendering simple glyphs.

* src/smooth/ftgrays.c (gray_hline, gray_render_span): Remove checks.
This commit is contained in:
Alexei Podtelezhnikov 2016-08-30 23:21:23 -04:00
parent e73055c791
commit f44ddfda45
2 changed files with 32 additions and 33 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2016-08-30 Alexei Podtelezhnikov <apodtele@gmail.com>
[smooth] Streamline pixmap drawing a bit more.
Zero coverage is unlikely (1 out of 256) to warrant checking. This
gives 0.5% speed improvement in dendering simple glyphs.
* src/smooth/ftgrays.c (gray_hline, gray_render_span): Remove checks.
2016-08-29 Alexei Podtelezhnikov <apodtele@gmail.com>
[smooth] Streamline pixmap drawing.

56
src/smooth/ftgrays.c
View File

@ -1281,31 +1281,26 @@ typedef ptrdiff_t FT_PtrDist;
for ( ; count > 0; count--, spans++ )
{
unsigned char coverage = spans->coverage;
unsigned char coverage = spans->coverage;
unsigned char* q = p + spans->x;
if ( coverage )
/* For small-spans it is faster to do it by ourselves than
* calling `memset'. This is mainly due to the cost of the
* function call.
*/
switch ( spans->len )
{
unsigned char* q = p + spans->x;
/* For small-spans it is faster to do it by ourselves than
* calling `memset'. This is mainly due to the cost of the
* function call.
*/
switch ( spans->len )
{
case 7: *q++ = coverage;
case 6: *q++ = coverage;
case 5: *q++ = coverage;
case 4: *q++ = coverage;
case 3: *q++ = coverage;
case 2: *q++ = coverage;
case 1: *q = coverage;
case 0: break;
default:
FT_MEM_SET( q, coverage, spans->len );
}
case 7: *q++ = coverage;
case 6: *q++ = coverage;
case 5: *q++ = coverage;
case 4: *q++ = coverage;
case 3: *q++ = coverage;
case 2: *q++ = coverage;
case 1: *q = coverage;
case 0: break;
default:
FT_MEM_SET( q, coverage, spans->len );
}
}
}
@ -1317,7 +1312,8 @@ typedef ptrdiff_t FT_PtrDist;
TArea area,
TCoord acount )
{
int coverage;
int coverage;
FT_Span span;
/* compute the coverage line's coverage, depending on the */
@ -1346,17 +1342,11 @@ typedef ptrdiff_t FT_PtrDist;
coverage = 255;
}
if ( coverage )
{
FT_Span span;
span.x = (short)( x + ras.min_ex );
span.len = (unsigned short)acount;
span.coverage = (unsigned char)coverage;
span.x = (short)( x + ras.min_ex );
span.len = (unsigned short)acount;
span.coverage = (unsigned char)coverage;
ras.render_span( y + ras.min_ey, 1, &span, ras.render_span_data );
}
ras.render_span( y + ras.min_ey, 1, &span, ras.render_span_data );
}