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* src/base/ftlcdfil.c (ft_lcd_filter_fir): Improve code.

This commit is contained in:
Alexei Podtelezhnikov 2017-07-03 22:49:07 -04:00
parent ca799e9be5
commit c56d8851ea
2 changed files with 13 additions and 21 deletions
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6
ChangeLog
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@ -1,3 +1,7 @@
2017-07-03 Alexei Podtelezhnikov <apodtele@gmail.com>
* src/base/ftlcdfil.c (ft_lcd_filter_fir): Improve code.
2017-07-03 Werner Lemberg <wl@gnu.org>
[truetype] Integer overflow.
@ -112,7 +116,7 @@
[base, smooth] LCD filtering cleanups.
* src/base/ftlcdlil.c (ft_lcd_filter_fir, _ft_lcd_filter_legacy):
* src/base/ftlcdfil.c (ft_lcd_filter_fir, _ft_lcd_filter_legacy):
Clean up, start filtering from the bottom-left origin.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Updated.

28
src/base/ftlcdfil.c
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@ -29,6 +29,8 @@
/* define USE_LEGACY to implement the legacy filter */
#define USE_LEGACY
#define FT_SHIFTCLAMP( x ) ( x >>= 8, (FT_Byte)( x > 255 ? 255 : x ) )
/* FIR filter used by the default and light filters */
FT_BASE( void )
ft_lcd_filter_fir( FT_Bitmap* bitmap,
@ -80,18 +82,11 @@
fir[3] = fir[4] + weights[3] * val;
fir[4] = weights[4] * val;
fir[0] >>= 8;
fir[0] |= (FT_UInt)-(FT_Int)( fir[0] >> 8 );
line[xx - 2] = (FT_Byte)fir[0];
line[xx - 2] = FT_SHIFTCLAMP( fir[0] );
}
fir[1] >>= 8;
fir[1] |= (FT_UInt)-(FT_Int)( fir[1] >> 8 );
line[xx - 2] = (FT_Byte)fir[1];
fir[2] >>= 8;
fir[2] |= (FT_UInt)-(FT_Int)( fir[2] >> 8 );
line[xx - 1] = (FT_Byte)fir[2];
line[xx - 2] = FT_SHIFTCLAMP( fir[1] );
line[xx - 1] = FT_SHIFTCLAMP( fir[2] );
}
}
@ -130,18 +125,11 @@
fir[3] = fir[4] + weights[3] * val;
fir[4] = weights[4] * val;
fir[0] >>= 8;
fir[0] |= (FT_UInt)-(FT_Int)( fir[0] >> 8 );
col[pitch * 2] = (FT_Byte)fir[0];
col[pitch * 2] = FT_SHIFTCLAMP( fir[0] );
}
fir[1] >>= 8;
fir[1] |= (FT_UInt)-(FT_Int)( fir[1] >> 8 );
col[pitch * 2] = (FT_Byte)fir[1];
fir[2] >>= 8;
fir[2] |= (FT_UInt)-(FT_Int)( fir[2] >> 8 );
col[pitch] = (FT_Byte)fir[2];
col[pitch * 2] = FT_SHIFTCLAMP( fir[1] );
col[pitch] = FT_SHIFTCLAMP( fir[2] );
}
}
}