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* src/smooth/ftgrays.c (gray_render_scanline): Improve code.

This commit is contained in:
Alexei Podtelezhnikov 2017-01-31 23:13:50 -05:00
parent fa437d8d3c
commit 2ca5b07d4f
2 changed files with 23 additions and 23 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2017-01-31 Alexei Podtelezhnikov <apodtele@gmail.com>
* src/smooth/ftgrays.c (gray_render_scanline): Improve code.
2017-01-31 Werner Lemberg <wl@gnu.org> 2017-01-31 Werner Lemberg <wl@gnu.org>
[cff] Provide metrics variation service interface (#50196). [cff] Provide metrics variation service interface (#50196).

42
src/smooth/ftgrays.c
View File

@ -600,7 +600,7 @@ typedef ptrdiff_t FT_PtrDist;
TPos x2, TPos x2,
TCoord y2 ) TCoord y2 )
{ {
TCoord ex1, ex2, fx1, fx2, first, delta, mod; TCoord ex1, ex2, fx1, fx2, first, dy, delta, mod;
TPos p, dx; TPos p, dx;
int incr; int incr;
@ -617,31 +617,27 @@ typedef ptrdiff_t FT_PtrDist;
fx1 = (TCoord)( x1 - SUBPIXELS( ex1 ) ); fx1 = (TCoord)( x1 - SUBPIXELS( ex1 ) );
fx2 = (TCoord)( x2 - SUBPIXELS( ex2 ) ); fx2 = (TCoord)( x2 - SUBPIXELS( ex2 ) );
delta = y2 - y1;
/* everything is located in a single cell. That is easy! */ /* everything is located in a single cell. That is easy! */
/* */ /* */
if ( ex1 == ex2 ) if ( ex1 == ex2 )
{ goto End;
ras.area += (TArea)(( fx1 + fx2 ) * delta);
ras.cover += delta;
return;
}
/* ok, we'll have to render a run of adjacent cells on the same */ /* ok, we'll have to render a run of adjacent cells on the same */
/* scanline... */ /* scanline... */
/* */ /* */
dx = x2 - x1; dx = x2 - x1;
dy = y2 - y1;
if ( dx > 0 ) if ( dx > 0 )
{ {
p = ( ONE_PIXEL - fx1 ) * delta; p = ( ONE_PIXEL - fx1 ) * dy;
first = ONE_PIXEL; first = ONE_PIXEL;
incr = 1; incr = 1;
} }
else else
{ {
p = fx1 * delta; p = fx1 * dy;
first = 0; first = 0;
incr = -1; incr = -1;
dx = -dx; dx = -dx;
@ -649,34 +645,31 @@ typedef ptrdiff_t FT_PtrDist;
FT_DIV_MOD( TCoord, p, dx, delta, mod ); FT_DIV_MOD( TCoord, p, dx, delta, mod );
ras.area += (TArea)(( fx1 + first ) * delta); ras.area += (TArea)( ( fx1 + first ) * delta );
ras.cover += delta; ras.cover += delta;
y1 += delta;
ex1 += incr; ex1 += incr;
gray_set_cell( RAS_VAR_ ex1, ey ); gray_set_cell( RAS_VAR_ ex1, ey );
y1 += delta;
if ( ex1 != ex2 ) if ( ex1 != ex2 )
{ {
TCoord lift, rem; TCoord lift, rem;
p = ONE_PIXEL * ( y2 - y1 + delta ); p = ONE_PIXEL * dy;
FT_DIV_MOD( TCoord, p, dx, lift, rem ); FT_DIV_MOD( TCoord, p, dx, lift, rem );
mod -= (int)dx;
do do
{ {
delta = lift; delta = lift;
mod += rem; mod += rem;
if ( mod >= 0 ) if ( mod >= (TCoord)dx )
{ {
mod -= (TCoord)dx; mod -= (TCoord)dx;
delta++; delta++;
} }
ras.area += (TArea)(ONE_PIXEL * delta); ras.area += (TArea)( ONE_PIXEL * delta );
ras.cover += delta; ras.cover += delta;
y1 += delta; y1 += delta;
ex1 += incr; ex1 += incr;
@ -684,9 +677,13 @@ typedef ptrdiff_t FT_PtrDist;
} while ( ex1 != ex2 ); } while ( ex1 != ex2 );
} }
delta = y2 - y1; fx1 = ONE_PIXEL - first;
ras.area += (TArea)(( fx2 + ONE_PIXEL - first ) * delta);
ras.cover += delta; End:
dy = y2 - y1;
ras.area += (TArea)( ( fx1 + fx2 ) * dy );
ras.cover += dy;
} }
@ -798,13 +795,12 @@ typedef ptrdiff_t FT_PtrDist;
p = ONE_PIXEL * dx; p = ONE_PIXEL * dx;
FT_DIV_MOD( TCoord, p, dy, lift, rem ); FT_DIV_MOD( TCoord, p, dy, lift, rem );
mod -= (TCoord)dy;
do do
{ {
delta = lift; delta = lift;
mod += rem; mod += rem;
if ( mod >= 0 ) if ( mod >= (TCoord)dy )
{ {
mod -= (TCoord)dy; mod -= (TCoord)dy;
delta++; delta++;