mirror of https://github.com/freetype/freetype
[autofit] Introduce subscript top blue zones.
This feature is mainly for Khmer: The idea is to avoid a clash between the top of subscript glyphs and the bottom of normal baseline glyphs. This only works for character clusters mapped to multiple glyphs. * src/autofit/afblue.dat: Add subscript top blue zone for Khmer. * src/autofit/afblue.hin (AF_BLUE_PROPERTY_LATIN_SUB_TOP): New macro. * src/autofit/afblue.c, src/autofit/afblue.h: Regenerated. * src/autofit/aflatin.h (AF_LATIN_IS_SUB_TOP_BLUE, AF_LATIN_BLUE_SUB_TOP): New macros. * src/autofit/aflatin.c (af_latin_metrics_init_blues): Handle new blue zone property. Update tracing messages. (af_latin_metrics_scale_dim): Handle new blue zone property. (af_latin_hints_compute_blue_edges): Updated.
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ChangeLog
26
ChangeLog
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@ -1,3 +1,29 @@
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2015-12-09 Werner Lemberg <wl@gnu.org>
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[autofit] Introduce subscript top blue zones.
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This feature is mainly for Khmer: The idea is to avoid a clash
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between the top of subscript glyphs and the bottom of normal
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baseline glyphs.
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This only works for character clusters mapped to multiple glyphs.
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* src/autofit/afblue.dat: Add subscript top blue zone for Khmer.
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* src/autofit/afblue.hin (AF_BLUE_PROPERTY_LATIN_SUB_TOP): New
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macro.
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* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
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* src/autofit/aflatin.h (AF_LATIN_IS_SUB_TOP_BLUE,
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AF_LATIN_BLUE_SUB_TOP): New macros.
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* src/autofit/aflatin.c (af_latin_metrics_init_blues): Handle new
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blue zone property.
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Update tracing messages.
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(af_latin_metrics_scale_dim): Handle new blue zone property.
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(af_latin_hints_compute_blue_edges): Updated.
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2015-12-09 Werner Lemberg <wl@gnu.org>
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[autofit] Fix tracing message.
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@ -66,6 +66,8 @@
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'\0',
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'\xE1', '\x9E', '\x81', ' ', '\xE1', '\x9E', '\x91', ' ', '\xE1', '\x9E', '\x93', ' ', '\xE1', '\x9E', '\xA7', ' ', '\xE1', '\x9E', '\xA9', ' ', '\xE1', '\x9E', '\xB6', /* ខ ទ ន ឧ ឩ ា */
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'\0',
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'\xE1', '\x9E', '\x80', '\xE1', '\x9F', '\x92', '\xE1', '\x9E', '\x80', ' ', '\xE1', '\x9E', '\x80', '\xE1', '\x9F', '\x92', '\xE1', '\x9E', '\x81', ' ', '\xE1', '\x9E', '\x80', '\xE1', '\x9F', '\x92', '\xE1', '\x9E', '\x82', ' ', '\xE1', '\x9E', '\x80', '\xE1', '\x9F', '\x92', '\xE1', '\x9E', '\x90', /* ក្ក ក្ខ ក្គ ក្ថ */
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'\0',
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'\xE1', '\x9E', '\x81', ' ', '\xE1', '\x9E', '\x83', ' ', '\xE1', '\x9E', '\x85', ' ', '\xE1', '\x9E', '\x8B', ' ', '\xE1', '\x9E', '\x94', ' ', '\xE1', '\x9E', '\x98', ' ', '\xE1', '\x9E', '\x99', ' ', '\xE1', '\x9E', '\xB2', /* ខ ឃ ច ឋ ប ម យ ឲ */
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'\0',
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'\xE1', '\x9E', '\x8F', '\xE1', '\x9F', '\x92', '\xE1', '\x9E', '\x9A', ' ', '\xE1', '\x9E', '\x9A', '\xE1', '\x9F', '\x80', ' ', '\xE1', '\x9E', '\xB2', '\xE1', '\x9F', '\x92', '\xE1', '\x9E', '\x99', ' ', '\xE1', '\x9E', '\xA2', '\xE1', '\x9E', '\xBF', /* ត្រ រៀ ឲ្យ អឿ */
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@ -217,6 +219,7 @@
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{ AF_BLUE_STRING_MAX, 0 },
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{ AF_BLUE_STRING_KHMER_TOP, AF_BLUE_PROPERTY_LATIN_TOP |
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AF_BLUE_PROPERTY_LATIN_X_HEIGHT },
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{ AF_BLUE_STRING_KHMER_SUBSCRIPT_TOP, AF_BLUE_PROPERTY_LATIN_SUB_TOP },
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{ AF_BLUE_STRING_KHMER_BOTTOM, 0 },
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{ AF_BLUE_STRING_KHMER_DESCENDER, 0 },
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{ AF_BLUE_STRING_KHMER_LARGE_DESCENDER, 0 },
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@ -127,6 +127,8 @@ AF_BLUE_STRING_ENUM AF_BLUE_STRINGS_ARRAY AF_BLUE_STRING_MAX_LEN:
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AF_BLUE_STRING_KHMER_TOP
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"ខ ទ ន ឧ ឩ ា"
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AF_BLUE_STRING_KHMER_SUBSCRIPT_TOP
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"ក្ក ក្ខ ក្គ ក្ថ"
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AF_BLUE_STRING_KHMER_BOTTOM
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"ខ ឃ ច ឋ ប ម យ ឲ"
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AF_BLUE_STRING_KHMER_DESCENDER
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@ -297,6 +299,21 @@ AF_BLUE_STRING_ENUM AF_BLUE_STRINGS_ARRAY AF_BLUE_STRING_MAX_LEN:
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//
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// If not set, take the minimum values.
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//
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// Mutually exclusive with `LATIN_SUB_TOP'.
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//
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// LATIN_SUB_TOP
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// For all glyphs of a character cluster, compute the maximum flat
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// and round coordinate values of each component, then take the
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// smallest of the maximum values. The idea is to get the top of
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// subscript glyphs, as used in Khmer, for example. Note that
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// this mechanism doesn't work for ordinary ligatures.
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//
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// This flags indicates a secondary blue zone: It gets removed if
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// there is a non-LATIN_SUB_TOP blue zone at the same coordinate
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// value (after scaling).
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//
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// Mutually exclusive with `LATIN_TOP'.
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//
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// LATIN_NEUTRAL
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// Ignore round extrema and define the blue zone with flat values only.
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// Both top and bottom of contours can match. This is useful for
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@ -401,6 +418,7 @@ AF_BLUE_STRINGSET_ENUM AF_BLUE_STRINGSETS_ARRAY AF_BLUE_STRINGSET_MAX_LEN:
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AF_BLUE_STRINGSET_KHMR
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{ AF_BLUE_STRING_KHMER_TOP, AF_BLUE_PROPERTY_LATIN_TOP |
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AF_BLUE_PROPERTY_LATIN_X_HEIGHT }
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{ AF_BLUE_STRING_KHMER_SUBSCRIPT_TOP, AF_BLUE_PROPERTY_LATIN_SUB_TOP }
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{ AF_BLUE_STRING_KHMER_BOTTOM, 0 }
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{ AF_BLUE_STRING_KHMER_DESCENDER, 0 }
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{ AF_BLUE_STRING_KHMER_LARGE_DESCENDER, 0 }
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@ -97,41 +97,42 @@ FT_BEGIN_HEADER
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AF_BLUE_STRING_HEBREW_BOTTOM = 350,
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AF_BLUE_STRING_HEBREW_DESCENDER = 368,
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AF_BLUE_STRING_KHMER_TOP = 383,
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AF_BLUE_STRING_KHMER_BOTTOM = 407,
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AF_BLUE_STRING_KHMER_DESCENDER = 439,
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AF_BLUE_STRING_KHMER_LARGE_DESCENDER = 473,
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AF_BLUE_STRING_KHMER_SYMBOLS_WAXING_TOP = 560,
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AF_BLUE_STRING_KHMER_SYMBOLS_WANING_BOTTOM = 568,
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AF_BLUE_STRING_LAO_TOP = 576,
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AF_BLUE_STRING_LAO_BOTTOM = 608,
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AF_BLUE_STRING_LAO_ASCENDER = 640,
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AF_BLUE_STRING_LAO_LARGE_ASCENDER = 656,
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AF_BLUE_STRING_LAO_DESCENDER = 668,
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AF_BLUE_STRING_LATIN_CAPITAL_TOP = 692,
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AF_BLUE_STRING_LATIN_CAPITAL_BOTTOM = 708,
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AF_BLUE_STRING_LATIN_SMALL_F_TOP = 724,
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AF_BLUE_STRING_LATIN_SMALL = 738,
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AF_BLUE_STRING_LATIN_SMALL_DESCENDER = 752,
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AF_BLUE_STRING_LATIN_SUBS_CAPITAL_TOP = 762,
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AF_BLUE_STRING_LATIN_SUBS_CAPITAL_BOTTOM = 782,
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AF_BLUE_STRING_LATIN_SUBS_SMALL_F_TOP = 802,
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AF_BLUE_STRING_LATIN_SUBS_SMALL = 822,
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AF_BLUE_STRING_LATIN_SUBS_SMALL_DESCENDER = 858,
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AF_BLUE_STRING_LATIN_SUPS_CAPITAL_TOP = 878,
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AF_BLUE_STRING_LATIN_SUPS_CAPITAL_BOTTOM = 909,
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AF_BLUE_STRING_LATIN_SUPS_SMALL_F_TOP = 938,
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AF_BLUE_STRING_LATIN_SUPS_SMALL = 964,
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AF_BLUE_STRING_LATIN_SUPS_SMALL_DESCENDER = 989,
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AF_BLUE_STRING_TELUGU_TOP = 1000,
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AF_BLUE_STRING_TELUGU_BOTTOM = 1028,
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AF_BLUE_STRING_THAI_TOP = 1056,
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AF_BLUE_STRING_THAI_BOTTOM = 1080,
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AF_BLUE_STRING_THAI_ASCENDER = 1108,
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AF_BLUE_STRING_THAI_LARGE_ASCENDER = 1120,
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AF_BLUE_STRING_THAI_DESCENDER = 1132,
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AF_BLUE_STRING_THAI_LARGE_DESCENDER = 1148,
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AF_BLUE_STRING_THAI_DIGIT_TOP = 1156,
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af_blue_1_1 = 1167,
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AF_BLUE_STRING_KHMER_SUBSCRIPT_TOP = 407,
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AF_BLUE_STRING_KHMER_BOTTOM = 447,
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AF_BLUE_STRING_KHMER_DESCENDER = 479,
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AF_BLUE_STRING_KHMER_LARGE_DESCENDER = 513,
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AF_BLUE_STRING_KHMER_SYMBOLS_WAXING_TOP = 600,
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AF_BLUE_STRING_KHMER_SYMBOLS_WANING_BOTTOM = 608,
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AF_BLUE_STRING_LAO_TOP = 616,
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AF_BLUE_STRING_LAO_BOTTOM = 648,
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AF_BLUE_STRING_LAO_ASCENDER = 680,
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AF_BLUE_STRING_LAO_LARGE_ASCENDER = 696,
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AF_BLUE_STRING_LAO_DESCENDER = 708,
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AF_BLUE_STRING_LATIN_CAPITAL_TOP = 732,
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AF_BLUE_STRING_LATIN_CAPITAL_BOTTOM = 748,
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AF_BLUE_STRING_LATIN_SMALL_F_TOP = 764,
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AF_BLUE_STRING_LATIN_SMALL = 778,
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AF_BLUE_STRING_LATIN_SMALL_DESCENDER = 792,
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AF_BLUE_STRING_LATIN_SUBS_CAPITAL_TOP = 802,
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AF_BLUE_STRING_LATIN_SUBS_CAPITAL_BOTTOM = 822,
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AF_BLUE_STRING_LATIN_SUBS_SMALL_F_TOP = 842,
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AF_BLUE_STRING_LATIN_SUBS_SMALL = 862,
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AF_BLUE_STRING_LATIN_SUBS_SMALL_DESCENDER = 898,
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AF_BLUE_STRING_LATIN_SUPS_CAPITAL_TOP = 918,
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AF_BLUE_STRING_LATIN_SUPS_CAPITAL_BOTTOM = 949,
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AF_BLUE_STRING_LATIN_SUPS_SMALL_F_TOP = 978,
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AF_BLUE_STRING_LATIN_SUPS_SMALL = 1004,
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AF_BLUE_STRING_LATIN_SUPS_SMALL_DESCENDER = 1029,
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AF_BLUE_STRING_TELUGU_TOP = 1040,
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AF_BLUE_STRING_TELUGU_BOTTOM = 1068,
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AF_BLUE_STRING_THAI_TOP = 1096,
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AF_BLUE_STRING_THAI_BOTTOM = 1120,
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AF_BLUE_STRING_THAI_ASCENDER = 1148,
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AF_BLUE_STRING_THAI_LARGE_ASCENDER = 1160,
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AF_BLUE_STRING_THAI_DESCENDER = 1172,
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AF_BLUE_STRING_THAI_LARGE_DESCENDER = 1188,
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AF_BLUE_STRING_THAI_DIGIT_TOP = 1196,
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af_blue_1_1 = 1207,
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#ifdef AF_CONFIG_OPTION_CJK
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AF_BLUE_STRING_CJK_TOP = af_blue_1_1 + 1,
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AF_BLUE_STRING_CJK_BOTTOM = af_blue_1_1 + 203,
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/* blue string can't be used in more than a single writing system, which */
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/* is a safe bet. */
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#define AF_BLUE_PROPERTY_LATIN_TOP ( 1U << 0 ) /* must have value 1 */
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#define AF_BLUE_PROPERTY_LATIN_NEUTRAL ( 1U << 1 )
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#define AF_BLUE_PROPERTY_LATIN_X_HEIGHT ( 1U << 2 )
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#define AF_BLUE_PROPERTY_LATIN_LONG ( 1U << 3 )
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#define AF_BLUE_PROPERTY_LATIN_SUB_TOP ( 1U << 1 )
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#define AF_BLUE_PROPERTY_LATIN_NEUTRAL ( 1U << 2 )
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#define AF_BLUE_PROPERTY_LATIN_X_HEIGHT ( 1U << 3 )
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#define AF_BLUE_PROPERTY_LATIN_LONG ( 1U << 4 )
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#define AF_BLUE_PROPERTY_CJK_TOP ( 1U << 0 ) /* must have value 1 */
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#define AF_BLUE_PROPERTY_CJK_HORIZ ( 1U << 1 ) /* must have value 2 */
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AF_BLUE_STRINGSET_GREK = 16,
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AF_BLUE_STRINGSET_HEBR = 23,
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AF_BLUE_STRINGSET_KHMR = 27,
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AF_BLUE_STRINGSET_KHMS = 32,
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AF_BLUE_STRINGSET_LAO = 35,
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AF_BLUE_STRINGSET_LATN = 41,
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AF_BLUE_STRINGSET_LATB = 48,
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AF_BLUE_STRINGSET_LATP = 55,
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AF_BLUE_STRINGSET_TELU = 62,
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AF_BLUE_STRINGSET_THAI = 65,
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af_blue_2_1 = 73,
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AF_BLUE_STRINGSET_KHMS = 33,
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AF_BLUE_STRINGSET_LAO = 36,
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AF_BLUE_STRINGSET_LATN = 42,
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AF_BLUE_STRINGSET_LATB = 49,
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AF_BLUE_STRINGSET_LATP = 56,
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AF_BLUE_STRINGSET_TELU = 63,
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AF_BLUE_STRINGSET_THAI = 66,
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af_blue_2_1 = 74,
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#ifdef AF_CONFIG_OPTION_CJK
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AF_BLUE_STRINGSET_HANI = af_blue_2_1 + 0,
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af_blue_2_1_1 = af_blue_2_1 + 2,
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/* blue string can't be used in more than a single writing system, which */
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/* is a safe bet. */
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#define AF_BLUE_PROPERTY_LATIN_TOP ( 1U << 0 ) /* must have value 1 */
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#define AF_BLUE_PROPERTY_LATIN_NEUTRAL ( 1U << 1 )
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#define AF_BLUE_PROPERTY_LATIN_X_HEIGHT ( 1U << 2 )
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#define AF_BLUE_PROPERTY_LATIN_LONG ( 1U << 3 )
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#define AF_BLUE_PROPERTY_LATIN_SUB_TOP ( 1U << 1 )
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#define AF_BLUE_PROPERTY_LATIN_NEUTRAL ( 1U << 2 )
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#define AF_BLUE_PROPERTY_LATIN_X_HEIGHT ( 1U << 3 )
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#define AF_BLUE_PROPERTY_LATIN_LONG ( 1U << 4 )
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#define AF_BLUE_PROPERTY_CJK_TOP ( 1U << 0 ) /* must have value 1 */
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#define AF_BLUE_PROPERTY_CJK_HORIZ ( 1U << 1 ) /* must have value 2 */
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@ -330,6 +330,11 @@
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FT_TRACE5(( "top" ));
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have_flag = 1;
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}
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else if ( AF_LATIN_IS_SUB_TOP_BLUE( bs ) )
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{
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FT_TRACE5(( "sub top" ));
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have_flag = 1;
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}
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if ( AF_LATIN_IS_NEUTRAL_BLUE( bs ) )
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{
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if ( last <= first )
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continue;
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if ( AF_LATIN_IS_TOP_BLUE( bs ) )
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if ( AF_LATIN_IS_TOP_BLUE( bs ) ||
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AF_LATIN_IS_SUB_TOP_BLUE( bs ) )
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{
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for ( pp = first; pp <= last; pp++ )
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{
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FT_Bool over_ref = FT_BOOL( shoot > ref );
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if ( AF_LATIN_IS_TOP_BLUE( bs ) ^ over_ref )
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if ( ( AF_LATIN_IS_TOP_BLUE( bs ) ||
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AF_LATIN_IS_SUB_TOP_BLUE( bs) ) ^ over_ref )
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{
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*blue_ref =
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*blue_shoot = ( shoot + ref ) / 2;
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blue->flags = 0;
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if ( AF_LATIN_IS_TOP_BLUE( bs ) )
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blue->flags |= AF_LATIN_BLUE_TOP;
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if ( AF_LATIN_IS_SUB_TOP_BLUE( bs ) )
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blue->flags |= AF_LATIN_BLUE_SUB_TOP;
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if ( AF_LATIN_IS_NEUTRAL_BLUE( bs ) )
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blue->flags |= AF_LATIN_BLUE_NEUTRAL;
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@ -1259,6 +1268,40 @@
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}
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}
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/* use sub-top blue zone only if it doesn't overlap with */
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/* another (non-sup-top) blue zone; otherwise, the */
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/* effect would be similar to a neutral blue zone, which */
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/* is not desired here */
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for ( nn = 0; nn < axis->blue_count; nn++ )
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{
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AF_LatinBlue blue = &axis->blues[nn];
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FT_UInt i;
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if ( !( blue->flags & AF_LATIN_BLUE_SUB_TOP ) )
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continue;
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if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) )
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continue;
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for ( i = 0; i < axis->blue_count; i++ )
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{
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AF_LatinBlue b = &axis->blues[i];
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if ( b->flags & AF_LATIN_BLUE_SUB_TOP )
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continue;
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if ( !( b->flags & AF_LATIN_BLUE_ACTIVE ) )
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continue;
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if ( b->ref.fit <= blue->shoot.fit &&
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b->shoot.fit >= blue->ref.fit )
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{
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blue->flags &= ~AF_LATIN_BLUE_ACTIVE;
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break;
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}
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}
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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for ( nn = 0; nn < axis->blue_count; nn++ )
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{
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@ -2071,7 +2114,8 @@
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/* the major direction) -- this assumes the TrueType convention */
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/* for the orientation of contours */
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is_top_blue =
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(FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );
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(FT_Byte)( ( blue->flags & ( AF_LATIN_BLUE_TOP |
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AF_LATIN_BLUE_SUB_TOP ) ) != 0 );
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is_neutral_blue =
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(FT_Byte)( ( blue->flags & AF_LATIN_BLUE_NEUTRAL ) != 0);
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is_major_dir =
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@ -53,6 +53,8 @@ FT_BEGIN_HEADER
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#define AF_LATIN_IS_TOP_BLUE( b ) \
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( (b)->properties & AF_BLUE_PROPERTY_LATIN_TOP )
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#define AF_LATIN_IS_SUB_TOP_BLUE( b ) \
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( (b)->properties & AF_BLUE_PROPERTY_LATIN_SUB_TOP )
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#define AF_LATIN_IS_NEUTRAL_BLUE( b ) \
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( (b)->properties & AF_BLUE_PROPERTY_LATIN_NEUTRAL )
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#define AF_LATIN_IS_X_HEIGHT_BLUE( b ) \
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@ -65,8 +67,10 @@ FT_BEGIN_HEADER
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#define AF_LATIN_BLUE_ACTIVE ( 1U << 0 ) /* zone height is <= 3/4px */
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#define AF_LATIN_BLUE_TOP ( 1U << 1 ) /* we have a top blue zone */
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#define AF_LATIN_BLUE_NEUTRAL ( 1U << 2 ) /* we have neutral blue zone */
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#define AF_LATIN_BLUE_ADJUSTMENT ( 1U << 3 ) /* used for scale adjustment */
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#define AF_LATIN_BLUE_SUB_TOP ( 1U << 2 ) /* we have a subscript top */
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/* blue zone */
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#define AF_LATIN_BLUE_NEUTRAL ( 1U << 3 ) /* we have neutral blue zone */
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#define AF_LATIN_BLUE_ADJUSTMENT ( 1U << 4 ) /* used for scale adjustment */
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/* optimization */
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||||
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||||
|
||||
|
|
Loading…
Reference in New Issue