The Tor Browser: comparison gfx/harfbuzz/src/hb-unicode-private.hh

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+:91487cf6ebb2
+/*
+* Copyright © 2009  Red Hat, Inc.
+* Copyright © 2011  Codethink Limited
+* Copyright © 2010,2011,2012  Google, Inc.
+*
+*  This is part of HarfBuzz, a text shaping library.
+*
+* Permission is hereby granted, without written agreement and without
+* license or royalty fees, to use, copy, modify, and distribute this
+* software and its documentation for any purpose, provided that the
+* above copyright notice and the following two paragraphs appear in
+* all copies of this software.
+*
+* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+* DAMAGE.
+*
+* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+* FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+*
+* Red Hat Author(s): Behdad Esfahbod
+* Codethink Author(s): Ryan Lortie
+* Google Author(s): Behdad Esfahbod
+*/
+#ifndef HB_UNICODE_PRIVATE_HH
+#define HB_UNICODE_PRIVATE_HH
+#include "hb-private.hh"
+#include "hb-object-private.hh"
+extern HB_INTERNAL const uint8_t _hb_modified_combining_class[256];
+/*
+* hb_unicode_funcs_t
+*/
+#define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS \
+HB_UNICODE_FUNC_IMPLEMENT (combining_class) \
+HB_UNICODE_FUNC_IMPLEMENT (eastasian_width) \
+HB_UNICODE_FUNC_IMPLEMENT (general_category) \
+HB_UNICODE_FUNC_IMPLEMENT (mirroring) \
+HB_UNICODE_FUNC_IMPLEMENT (script) \
+HB_UNICODE_FUNC_IMPLEMENT (compose) \
+HB_UNICODE_FUNC_IMPLEMENT (decompose) \
+HB_UNICODE_FUNC_IMPLEMENT (decompose_compatibility) \
+/* ^--- Add new callbacks here */
+/* Simple callbacks are those taking a hb_codepoint_t and returning a hb_codepoint_t */
+#define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE \
+HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_combining_class_t, combining_class) \
+HB_UNICODE_FUNC_IMPLEMENT (unsigned int, eastasian_width) \
+HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_general_category_t, general_category) \
+HB_UNICODE_FUNC_IMPLEMENT (hb_codepoint_t, mirroring) \
+HB_UNICODE_FUNC_IMPLEMENT (hb_script_t, script) \
+/* ^--- Add new simple callbacks here */
+struct hb_unicode_funcs_t {
+hb_object_header_t header;
+ASSERT_POD ();
+hb_unicode_funcs_t *parent;
+bool immutable;
+#define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \
+inline return_type name (hb_codepoint_t unicode) { return func.name (this, unicode, user_data.name); }
+HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
+#undef HB_UNICODE_FUNC_IMPLEMENT
+inline hb_bool_t compose (hb_codepoint_t a, hb_codepoint_t b,
+			    hb_codepoint_t *ab)
+{
+*ab = 0;
+if (unlikely (!a || !b)) return false;
+return func.compose (this, a, b, ab, user_data.compose);
+}
+inline hb_bool_t decompose (hb_codepoint_t ab,
+			      hb_codepoint_t *a, hb_codepoint_t *b)
+{
+*a = ab; *b = 0;
+return func.decompose (this, ab, a, b, user_data.decompose);
+}
+inline unsigned int decompose_compatibility (hb_codepoint_t  u,
+					       hb_codepoint_t *decomposed)
+{
+unsigned int ret = func.decompose_compatibility (this, u, decomposed, user_data.decompose_compatibility);
+if (ret == 1 && u == decomposed[0]) {
+decomposed[0] = 0;
+return 0;
+}
+decomposed[ret] = 0;
+return ret;
+}
+unsigned int
+modified_combining_class (hb_codepoint_t unicode)
+{
+/* XXX This hack belongs to the Myanmar shaper. */
+if (unlikely (unicode == 0x1037)) unicode = 0x103A;
+/* XXX This hack belongs to the SEA shaper (for Tai Tham):
+* Reorder SAKOT to ensure it comes after any tone marks. */
+if (unlikely (unicode == 0x1A60)) return 254;
+return _hb_modified_combining_class[combining_class (unicode)];
+}
+inline hb_bool_t
+is_variation_selector (hb_codepoint_t unicode)
+{
+return unlikely (hb_in_ranges<hb_codepoint_t> (unicode,
+						   0x180B, 0x180D, /* MONGOLIAN FREE VARIATION SELECTOR ONE..THREE */
+						   0xFE00, 0xFE0F, /* VARIATION SELECTOR-1..16 */
+						   0xE0100, 0xE01EF));  /* VARIATION SELECTOR-17..256 */
+}
+/* Default_Ignorable codepoints:
+*
+* Note that as of Oct 2012 (Unicode 6.2), U+180E MONGOLIAN VOWEL SEPARATOR
+* is NOT Default_Ignorable, but it really behaves in a way that it should
+* be.  That has been reported to the Unicode Technical Committee for
+* consideration.  As such, we include it here, since Uniscribe removes it.
+* It *is* in Unicode 6.3 however.  U+061C ARABIC LETTER MARK from Unicode
+* 6.3 is also added manually.  The new Unicode 6.3 bidi formatting
+* characters are encoded in a block that was Default_Ignorable already.
+*
+* Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable,
+* we do NOT want to hide them, as the way Uniscribe has implemented them
+* is with regular spacing glyphs, and that's the way fonts are made to work.
+* As such, we make exceptions for those four.
+*
+* Gathered from:
+* http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[:DI:]&abb=on&ucd=on&esc=on
+*
+* Last updated to the page with the following versions:
+* Version 3.6; ICU version: 50.0.1.0; Unicode version: 6.1.0.0
+*
+* 4,167 Code Points
+*
+* [\u00AD\u034F\u115F\u1160\u17B4\u17B5\u180B-\u180D\u200B-\u200F\u202A-\u202E\u2060-\u206F\u3164\uFE00-\uFE0F\uFEFF\uFFA0\uFFF0-\uFFF8\U0001D173-\U0001D17A\U000E0000-\U000E0FFF]
+*
+* 00AD ;SOFT HYPHEN
+* 034F ;COMBINING GRAPHEME JOINER
+* #115F ;HANGUL CHOSEONG FILLER
+* #1160 ;HANGUL JUNGSEONG FILLER
+* 17B4 ;KHMER VOWEL INHERENT AQ
+* 17B5 ;KHMER VOWEL INHERENT AA
+* 180B..180D ;MONGOLIAN FREE VARIATION SELECTOR THREE
+* 200B..200F ;RIGHT-TO-LEFT MARK
+* 202A..202E ;RIGHT-TO-LEFT OVERRIDE
+* 2060..206F ;NOMINAL DIGIT SHAPES
+* #3164 ;HANGUL FILLER
+* FE00..FE0F ;VARIATION SELECTOR-16
+* FEFF ;ZERO WIDTH NO-BREAK SPACE
+* #FFA0 ;HALFWIDTH HANGUL FILLER
+* FFF0..FFF8 ;<unassigned-FFF8>
+* 1D173..1D17A ;MUSICAL SYMBOL END PHRASE
+* E0000..E0FFF ;<unassigned-E0FFF>
+*/
+inline hb_bool_t
+is_default_ignorable (hb_codepoint_t ch)
+{
+hb_codepoint_t plane = ch >> 16;
+if (likely (plane == 0))
+{
+/* BMP */
+hb_codepoint_t page = ch >> 8;
+switch (page) {
+	case 0x00: return unlikely (ch == 0x00AD);
+	case 0x03: return unlikely (ch == 0x034F);
+	case 0x06: return unlikely (ch == 0x061C);
+	case 0x17: return hb_in_range<hb_codepoint_t> (ch, 0x17B4, 0x17B5);
+	case 0x18: return hb_in_range<hb_codepoint_t> (ch, 0x180B, 0x180E);
+	case 0x20: return hb_in_ranges<hb_codepoint_t> (ch, 0x200B, 0x200F,
+							    0x202A, 0x202E,
+							    0x2060, 0x206F);
+	case 0xFE: return hb_in_range<hb_codepoint_t> (ch, 0xFE00, 0xFE0F) || ch == 0xFEFF;
+	case 0xFF: return hb_in_range<hb_codepoint_t> (ch, 0xFFF0, 0xFFF8);
+	default: return false;
+}
+}
+else
+{
+/* Other planes */
+switch (plane) {
+	case 0x01: return hb_in_range<hb_codepoint_t> (ch, 0x0001D173, 0x0001D17A);
+	case 0x0E: return hb_in_range<hb_codepoint_t> (ch, 0x000E0000, 0x000E0FFF);
+	default: return false;
+}
+}
+}
+struct {
+#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name;
+HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+} func;
+struct {
+#define HB_UNICODE_FUNC_IMPLEMENT(name) void *name;
+HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+} user_data;
+struct {
+#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
+HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+} destroy;
+};
+extern HB_INTERNAL const hb_unicode_funcs_t _hb_unicode_funcs_nil;
+/* Modified combining marks */
+/* Hebrew
+*
+* We permute the "fixed-position" classes 10-26 into the order
+* described in the SBL Hebrew manual:
+*
+* http://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf
+*
+* (as recommended by:
+*  http://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering-t6751.0.html)
+*
+* More details here:
+* https://bugzilla.mozilla.org/show_bug.cgi?id=662055
+*/
+#define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */
+#define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */
+#define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */
+#define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */
+#define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */
+#define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */
+#define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */
+#define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */
+#define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats */
+#define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam */
+#define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */
+#define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */
+#define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */
+#define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */
+#define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */
+#define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */
+#define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */
+/*
+* Arabic
+*
+* Modify to move Shadda (ccc=33) before other marks.  See:
+* http://unicode.org/faq/normalization.html#8
+* http://unicode.org/faq/normalization.html#9
+*/
+#define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */
+#define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */
+#define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */
+#define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */
+#define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */
+#define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */
+#define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */
+#define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */
+#define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */
+/* Syriac */
+#define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */
+/* Telugu
+*
+* Modify Telugu length marks (ccc=84, ccc=91).
+* These are the only matras in the main Indic scripts range that have
+* a non-zero ccc.  That makes them reorder with the Halant that is
+* ccc=9.  Just zero them, we don't need them in our Indic shaper.
+*/
+#define HB_MODIFIED_COMBINING_CLASS_CCC84 0 /* length mark */
+#define HB_MODIFIED_COMBINING_CLASS_CCC91 0 /* ai length mark */
+/* Thai
+*
+* Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9).
+* Assign 3, which is unassigned otherwise.
+* Uniscribe does this reordering too.
+*/
+#define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */
+#define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */
+/* Lao */
+#define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */
+#define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */
+/* Tibetan */
+#define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */
+#define HB_MODIFIED_COMBINING_CLASS_CCC130 130 /* sign i */
+#define HB_MODIFIED_COMBINING_CLASS_CCC132 132 /* sign u */
+/* Misc */
+#define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \
+	(FLAG (gen_cat) & \
+	 (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \
+	  FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \
+	  FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))
+#endif /* HB_UNICODE_PRIVATE_HH */

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gfx/harfbuzz/src/hb-unicode-private.hh