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* src/smooth/ftgrays.c (gray_convert_glyph): Simplify bisections.

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This commit is contained in:
Alexei Podtelezhnikov 2026-05-14 23:14:25 -04:00
parent 5a280ecde6
commit ce82ebedfe
1 changed files with 16 additions and 17 deletions
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33
src/smooth/ftgrays.c
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@ -1869,7 +1869,7 @@ typedef ptrdiff_t FT_PtrDist;
gray_convert_glyph( RAS_ARG )
{
TCoord bands[32]; /* enough to accommodate bisections */
TCoord* band;
TCoord* band = bands;
int continued = 0;
int error = Smooth_Err_Ok;
@ -1885,11 +1885,9 @@ typedef ptrdiff_t FT_PtrDist;
ras.ycells = (PCell*)ras.buffer;
ras.min_ex = ras.cbox.xMin;
ras.min_ey = ras.cbox.yMin;
ras.max_ex = ras.cbox.xMax;
band = bands;
band[1] = ras.cbox.yMin;
band[0] = ras.cbox.yMax;
ras.max_ey = ras.cbox.yMax;
do
{
@ -1897,8 +1895,6 @@ typedef ptrdiff_t FT_PtrDist;
TCoord i;
ras.min_ey = band[1];
ras.max_ey = band[0];
ras.count_ey = ras.max_ey - ras.min_ey;
/* memory management: zero out and skip ycells */
@ -1921,27 +1917,30 @@ typedef ptrdiff_t FT_PtrDist;
gray_sweep_direct( RAS_VAR );
else
gray_sweep( RAS_VAR );
band--;
if ( band == bands )
break; /* done */
ras.max_ey = ras.min_ey;
ras.min_ey = *--band;
continue;
}
else if ( error != Smooth_Err_Raster_Overflow )
goto Exit;
/* render pool overflow; we will reduce the render band by half */
i = ( band[0] - band[1] ) >> 1;
/* this should never happen even with tiny rendering pool */
if ( i == 0 )
/* this happens only if the rendering pool is too small */
if ( ras.count_ey == 1 )
{
FT_TRACE7(( "gray_convert_glyph: rotten glyph\n" ));
error = FT_THROW( Raster_Overflow );
goto Exit;
}
band++;
band[1] = band[0];
band[0] += i;
} while ( band >= bands );
/* render pool overflow; we will reduce the render band by half */
*band++ = ras.min_ey;
ras.min_ey += ras.count_ey >> 1;
} while ( 1 );
Exit:
return error;