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[autofit] Use better blue zone characters for lowercase latin.

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The number of lowercase characters for computing the top flat blue
zone value was too small (in most cases only `x' and `z').  If one
of the two characters has a large serif, say, it can happen that
FreeType must select between two different values, having a 50%
chance to use the wrong one.  As a result, rendering at larger PPEM
values could yield uneven lowercase glyph heights.

Problem reported by Christoph Koeberlin <christoph@koe.berlin>.

* src/autofit/afblue.dat (AF_BLUE_STRING_LATIN_SMALL): Replaced
with...
(AF_BLUE_STRING_LATIN_SMALL_TOP, AF_BLUE_STRING_LATIN_SMALL_BOTTOM):
... New, extended sets.
(AF_BLUE_STRINGSET_LATN): Updated.

* src/autofit/afblue.c, scr/autofit/afblue.h: Regenerated.
Harmony
Werner Lemberg 8 years ago
parent a18f5e1002
commit 1dee4bf9f7
4 changed files with 66 additions and 40 deletions
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  1. 21
      ChangeLog
  2. 8
      src/autofit/afblue.c
  3. 10
      src/autofit/afblue.dat
  4. 67
      src/autofit/afblue.h

21
ChangeLog
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@ -1,3 +1,24 @@
2017-02-05 Werner Lemberg <wl@gnu.org>
[autofit] Use better blue zone characters for lowercase latin.
The number of lowercase characters for computing the top flat blue
zone value was too small (in most cases only `x' and `z'). If one
of the two characters has a large serif, say, it can happen that
FreeType must select between two different values, having a 50%
chance to use the wrong one. As a result, rendering at larger PPEM
values could yield uneven lowercase glyph heights.
Problem reported by Christoph Koeberlin <christoph@koe.berlin>.
* src/autofit/afblue.dat (AF_BLUE_STRING_LATIN_SMALL): Replaced
with...
(AF_BLUE_STRING_LATIN_SMALL_TOP, AF_BLUE_STRING_LATIN_SMALL_BOTTOM):
... New, extended sets.
(AF_BLUE_STRINGSET_LATN): Updated.
* src/autofit/afblue.c, scr/autofit/afblue.h: Regenerated.
2017-02-04 Werner Lemberg <wl@gnu.org>
Make `freetype-config' a wrapper of `pkg-config' if possible.

8
src/autofit/afblue.c
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@ -168,7 +168,9 @@
'\0',
'f', ' ', 'i', ' ', 'j', ' ', 'k', ' ', 'd', ' ', 'b', ' ', 'h', /* f i j k d b h */
'\0',
'x', ' ', 'z', ' ', 'r', ' ', 'o', ' ', 'e', ' ', 's', ' ', 'c', /* x z r o e s c */
'u', ' ', 'v', ' ', 'x', ' ', 'z', ' ', 'o', ' ', 'e', ' ', 's', ' ', 'c', /* u v x z o e s c */
'\0',
'n', ' ', 'r', ' ', 'x', ' ', 'z', ' ', 'o', ' ', 'e', ' ', 's', ' ', 'c', /* n r x z o e s c */
'\0',
'p', ' ', 'q', ' ', 'g', ' ', 'j', ' ', 'y', /* p q g j y */
'\0',
@ -392,9 +394,9 @@
{ AF_BLUE_STRING_LATIN_CAPITAL_TOP, AF_BLUE_PROPERTY_LATIN_TOP },
{ AF_BLUE_STRING_LATIN_CAPITAL_BOTTOM, 0 },
{ AF_BLUE_STRING_LATIN_SMALL_F_TOP, AF_BLUE_PROPERTY_LATIN_TOP },
{ AF_BLUE_STRING_LATIN_SMALL, AF_BLUE_PROPERTY_LATIN_TOP |
{ AF_BLUE_STRING_LATIN_SMALL_TOP, AF_BLUE_PROPERTY_LATIN_TOP |
AF_BLUE_PROPERTY_LATIN_X_HEIGHT },
{ AF_BLUE_STRING_LATIN_SMALL, 0 },
{ AF_BLUE_STRING_LATIN_SMALL_BOTTOM, 0 },
{ AF_BLUE_STRING_LATIN_SMALL_DESCENDER, 0 },
{ AF_BLUE_STRING_MAX, 0 },
{ AF_BLUE_STRING_LATIN_SUBS_CAPITAL_TOP, AF_BLUE_PROPERTY_LATIN_TOP },

10
src/autofit/afblue.dat
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@ -242,8 +242,10 @@ AF_BLUE_STRING_ENUM AF_BLUE_STRINGS_ARRAY AF_BLUE_STRING_MAX_LEN:
"H E Z L O C U S"
AF_BLUE_STRING_LATIN_SMALL_F_TOP
"f i j k d b h"
AF_BLUE_STRING_LATIN_SMALL
"x z r o e s c"
AF_BLUE_STRING_LATIN_SMALL_TOP
"u v x z o e s c"
AF_BLUE_STRING_LATIN_SMALL_BOTTOM
"n r x z o e s c"
AF_BLUE_STRING_LATIN_SMALL_DESCENDER
"p q g j y"
@ -630,9 +632,9 @@ AF_BLUE_STRINGSET_ENUM AF_BLUE_STRINGSETS_ARRAY AF_BLUE_STRINGSET_MAX_LEN:
{ AF_BLUE_STRING_LATIN_CAPITAL_TOP, AF_BLUE_PROPERTY_LATIN_TOP }
{ AF_BLUE_STRING_LATIN_CAPITAL_BOTTOM, 0 }
{ AF_BLUE_STRING_LATIN_SMALL_F_TOP, AF_BLUE_PROPERTY_LATIN_TOP }
{ AF_BLUE_STRING_LATIN_SMALL, AF_BLUE_PROPERTY_LATIN_TOP |
{ AF_BLUE_STRING_LATIN_SMALL_TOP, AF_BLUE_PROPERTY_LATIN_TOP |
AF_BLUE_PROPERTY_LATIN_X_HEIGHT }
{ AF_BLUE_STRING_LATIN_SMALL, 0 }
{ AF_BLUE_STRING_LATIN_SMALL_BOTTOM, 0 }
{ AF_BLUE_STRING_LATIN_SMALL_DESCENDER, 0 }
{ AF_BLUE_STRING_MAX, 0 }

67
src/autofit/afblue.h
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@ -148,39 +148,40 @@ FT_BEGIN_HEADER
AF_BLUE_STRING_LATIN_CAPITAL_TOP = 1852,
AF_BLUE_STRING_LATIN_CAPITAL_BOTTOM = 1868,
AF_BLUE_STRING_LATIN_SMALL_F_TOP = 1884,
AF_BLUE_STRING_LATIN_SMALL = 1898,
AF_BLUE_STRING_LATIN_SMALL_DESCENDER = 1912,
AF_BLUE_STRING_LATIN_SUBS_CAPITAL_TOP = 1922,
AF_BLUE_STRING_LATIN_SUBS_CAPITAL_BOTTOM = 1942,
AF_BLUE_STRING_LATIN_SUBS_SMALL_F_TOP = 1962,
AF_BLUE_STRING_LATIN_SUBS_SMALL = 1982,
AF_BLUE_STRING_LATIN_SUBS_SMALL_DESCENDER = 2018,
AF_BLUE_STRING_LATIN_SUPS_CAPITAL_TOP = 2038,
AF_BLUE_STRING_LATIN_SUPS_CAPITAL_BOTTOM = 2069,
AF_BLUE_STRING_LATIN_SUPS_SMALL_F_TOP = 2098,
AF_BLUE_STRING_LATIN_SUPS_SMALL = 2124,
AF_BLUE_STRING_LATIN_SUPS_SMALL_DESCENDER = 2149,
AF_BLUE_STRING_MALAYALAM_TOP = 2160,
AF_BLUE_STRING_MALAYALAM_BOTTOM = 2204,
AF_BLUE_STRING_MYANMAR_TOP = 2236,
AF_BLUE_STRING_MYANMAR_BOTTOM = 2268,
AF_BLUE_STRING_MYANMAR_ASCENDER = 2300,
AF_BLUE_STRING_MYANMAR_DESCENDER = 2328,
AF_BLUE_STRING_SINHALA_TOP = 2360,
AF_BLUE_STRING_SINHALA_BOTTOM = 2392,
AF_BLUE_STRING_SINHALA_DESCENDER = 2424,
AF_BLUE_STRING_TAMIL_TOP = 2468,
AF_BLUE_STRING_TAMIL_BOTTOM = 2500,
AF_BLUE_STRING_TELUGU_TOP = 2532,
AF_BLUE_STRING_TELUGU_BOTTOM = 2560,
AF_BLUE_STRING_THAI_TOP = 2588,
AF_BLUE_STRING_THAI_BOTTOM = 2612,
AF_BLUE_STRING_THAI_ASCENDER = 2640,
AF_BLUE_STRING_THAI_LARGE_ASCENDER = 2652,
AF_BLUE_STRING_THAI_DESCENDER = 2664,
AF_BLUE_STRING_THAI_LARGE_DESCENDER = 2680,
AF_BLUE_STRING_THAI_DIGIT_TOP = 2688,
af_blue_1_1 = 2699,
AF_BLUE_STRING_LATIN_SMALL_TOP = 1898,
AF_BLUE_STRING_LATIN_SMALL_BOTTOM = 1914,
AF_BLUE_STRING_LATIN_SMALL_DESCENDER = 1930,
AF_BLUE_STRING_LATIN_SUBS_CAPITAL_TOP = 1940,
AF_BLUE_STRING_LATIN_SUBS_CAPITAL_BOTTOM = 1960,
AF_BLUE_STRING_LATIN_SUBS_SMALL_F_TOP = 1980,
AF_BLUE_STRING_LATIN_SUBS_SMALL = 2000,
AF_BLUE_STRING_LATIN_SUBS_SMALL_DESCENDER = 2036,
AF_BLUE_STRING_LATIN_SUPS_CAPITAL_TOP = 2056,
AF_BLUE_STRING_LATIN_SUPS_CAPITAL_BOTTOM = 2087,
AF_BLUE_STRING_LATIN_SUPS_SMALL_F_TOP = 2116,
AF_BLUE_STRING_LATIN_SUPS_SMALL = 2142,
AF_BLUE_STRING_LATIN_SUPS_SMALL_DESCENDER = 2167,
AF_BLUE_STRING_MALAYALAM_TOP = 2178,
AF_BLUE_STRING_MALAYALAM_BOTTOM = 2222,
AF_BLUE_STRING_MYANMAR_TOP = 2254,
AF_BLUE_STRING_MYANMAR_BOTTOM = 2286,
AF_BLUE_STRING_MYANMAR_ASCENDER = 2318,
AF_BLUE_STRING_MYANMAR_DESCENDER = 2346,
AF_BLUE_STRING_SINHALA_TOP = 2378,
AF_BLUE_STRING_SINHALA_BOTTOM = 2410,
AF_BLUE_STRING_SINHALA_DESCENDER = 2442,
AF_BLUE_STRING_TAMIL_TOP = 2486,
AF_BLUE_STRING_TAMIL_BOTTOM = 2518,
AF_BLUE_STRING_TELUGU_TOP = 2550,
AF_BLUE_STRING_TELUGU_BOTTOM = 2578,
AF_BLUE_STRING_THAI_TOP = 2606,
AF_BLUE_STRING_THAI_BOTTOM = 2630,
AF_BLUE_STRING_THAI_ASCENDER = 2658,
AF_BLUE_STRING_THAI_LARGE_ASCENDER = 2670,
AF_BLUE_STRING_THAI_DESCENDER = 2682,
AF_BLUE_STRING_THAI_LARGE_DESCENDER = 2698,
AF_BLUE_STRING_THAI_DIGIT_TOP = 2706,
af_blue_1_1 = 2717,
#ifdef AF_CONFIG_OPTION_CJK
AF_BLUE_STRING_CJK_TOP = af_blue_1_1 + 1,
AF_BLUE_STRING_CJK_BOTTOM = af_blue_1_1 + 203,

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