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Re: [ft-devel] new CFF engine
From: |
octoploid |
Subject: |
Re: [ft-devel] new CFF engine |
Date: |
Sun, 12 May 2013 16:34:01 +0200 |
12.05.2013, 15:52, "Vernon Adams" <address@hidden>:
> I have been testing the new adobe-Freetype CFF engine, and was wondering if
> the default 'darkness' of stem darkening is a little too high?
> How does the width of stems in a font effect the amount of darkness rendered?
> I think someone mentioned that thinner stems will render with relatively more
> darkness than thicker stems? Is that correct? Or is the amount of darkness a
> uniform value across all rendered fonts?
You should read src/cff/cf2font.c:
95 /*
96 * Total darkening amount is computed in 1000 unit character space
97 * using the modified 5 part curve as Avalon rasterizer.
98 * The darkening amount is smaller for thicker stems.
99 * It becomes zero when the stem is thicker than 2.333 pixels.
100 *
101 * In Avalon rasterizer,
102 *
103 * darkenAmount = 0.5 pixels if scaledStem <= 0.5 pixels,
104 * darkenAmount = 0.333 pixels if 1 <= scaledStem <= 1.667 pixels,
105 * darkenAmount = 0 pixel if scaledStem >= 2.333 pixels,
106 *
107 * and piecewise linear in-between.
108 *
109 */
110 if ( scaledStem < cf2_intToFixed( 500 ) )
111 *darkenAmount = FT_DivFix( cf2_intToFixed( 400 ), ppem );
112
113 else if ( scaledStem < cf2_intToFixed( 1000 ) )
114 *darkenAmount = FT_DivFix( cf2_intToFixed( 525 ), ppem ) -
115 FT_MulFix( stemWidthPer1000,
116 cf2_floatToFixed( .25 ) );
117
118 else if ( scaledStem < cf2_intToFixed( 1667 ) )
119 *darkenAmount = FT_DivFix( cf2_intToFixed( 275 ), ppem );
120
121 else if ( scaledStem < cf2_intToFixed( 2333 ) )
122 *darkenAmount = FT_DivFix( cf2_intToFixed( 963 ), ppem ) -
123 FT_MulFix( stemWidthPer1000,
124 cf2_floatToFixed( .413 ) );
- Re: [ft-devel] new CFF engine, (continued)
- Re: [ft-devel] new CFF engine, Nikolaus Waxweiler, 2013/05/11
- Re: [ft-devel] new CFF engine, Werner LEMBERG, 2013/05/11
- Re: [ft-devel] new CFF engine, Werner LEMBERG, 2013/05/11
- Re: [ft-devel] new CFF engine, Dave Arnold, 2013/05/11
- Re: [ft-devel] new CFF engine, Nikolaus Waxweiler, 2013/05/12
- Re: [ft-devel] new CFF engine, Vernon Adams, 2013/05/12
- Re: [ft-devel] new CFF engine,
octoploid <=
- Re: [ft-devel] new CFF engine, Vernon Adams, 2013/05/12
Re: [ft-devel] new CFF engine, James Cloos, 2013/05/02
- Re: [ft-devel] new CFF engine, Werner LEMBERG, 2013/05/02
- Re: [ft-devel] new CFF engine, Werner LEMBERG, 2013/05/02
- Re: [ft-devel] new CFF engine, Ross Lagerwall, 2013/05/02
- Re: [ft-devel] new CFF engine, Werner LEMBERG, 2013/05/02
- Re: [ft-devel] new CFF engine, Ross Lagerwall, 2013/05/03
- Re: [ft-devel] new CFF engine, Werner LEMBERG, 2013/05/03
- Re: [ft-devel] new CFF engine, Werner LEMBERG, 2013/05/03
- Re: [ft-devel] new CFF engine, octoploid, 2013/05/03