author | prr |
Tue, 17 Jan 2017 11:56:40 -0800 | |
changeset 43232 | 8e39ad39979f |
parent 34414 | e496a8d8fc8a |
permissions | -rw-r--r-- |
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/* |
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* Copyright © 2012 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH |
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#define HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH |
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#include "hb-private.hh" |
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#include "hb-ot-shape-private.hh" |
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#include "hb-ot-layout-gsub-table.hh" |
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/* Features ordered the same as the entries in shaping_table rows, |
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* followed by rlig. Don't change. */ |
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static const hb_tag_t arabic_fallback_features[] = |
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{ |
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HB_TAG('i','n','i','t'), |
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HB_TAG('m','e','d','i'), |
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HB_TAG('f','i','n','a'), |
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HB_TAG('i','s','o','l'), |
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HB_TAG('r','l','i','g'), |
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}; |
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static OT::SubstLookup * |
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arabic_fallback_synthesize_lookup_single (const hb_ot_shape_plan_t *plan HB_UNUSED, |
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hb_font_t *font, |
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unsigned int feature_index) |
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{ |
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OT::GlyphID glyphs[SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1]; |
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OT::GlyphID substitutes[SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1]; |
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unsigned int num_glyphs = 0; |
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/* Populate arrays */ |
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for (hb_codepoint_t u = SHAPING_TABLE_FIRST; u < SHAPING_TABLE_LAST + 1; u++) |
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{ |
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hb_codepoint_t s = shaping_table[u - SHAPING_TABLE_FIRST][feature_index]; |
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hb_codepoint_t u_glyph, s_glyph; |
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if (!s || |
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!hb_font_get_glyph (font, u, 0, &u_glyph) || |
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!hb_font_get_glyph (font, s, 0, &s_glyph) || |
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u_glyph == s_glyph || |
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u_glyph > 0xFFFFu || s_glyph > 0xFFFFu) |
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continue; |
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glyphs[num_glyphs].set (u_glyph); |
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substitutes[num_glyphs].set (s_glyph); |
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num_glyphs++; |
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} |
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if (!num_glyphs) |
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return NULL; |
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/* Bubble-sort or something equally good! |
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* May not be good-enough for presidential candidate interviews, but good-enough for us... */ |
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hb_stable_sort (&glyphs[0], num_glyphs, OT::GlyphID::cmp, &substitutes[0]); |
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OT::Supplier<OT::GlyphID> glyphs_supplier (glyphs, num_glyphs); |
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OT::Supplier<OT::GlyphID> substitutes_supplier (substitutes, num_glyphs); |
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/* Each glyph takes four bytes max, and there's some overhead. */ |
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char buf[(SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1) * 4 + 128]; |
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OT::hb_serialize_context_t c (buf, sizeof (buf)); |
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OT::SubstLookup *lookup = c.start_serialize<OT::SubstLookup> (); |
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bool ret = lookup->serialize_single (&c, |
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OT::LookupFlag::IgnoreMarks, |
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glyphs_supplier, |
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substitutes_supplier, |
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num_glyphs); |
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c.end_serialize (); |
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/* TODO sanitize the results? */ |
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return ret ? c.copy<OT::SubstLookup> () : NULL; |
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} |
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static OT::SubstLookup * |
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arabic_fallback_synthesize_lookup_ligature (const hb_ot_shape_plan_t *plan HB_UNUSED, |
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hb_font_t *font) |
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{ |
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OT::GlyphID first_glyphs[ARRAY_LENGTH_CONST (ligature_table)]; |
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unsigned int first_glyphs_indirection[ARRAY_LENGTH_CONST (ligature_table)]; |
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unsigned int ligature_per_first_glyph_count_list[ARRAY_LENGTH_CONST (first_glyphs)]; |
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unsigned int num_first_glyphs = 0; |
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/* We know that all our ligatures are 2-component */ |
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OT::GlyphID ligature_list[ARRAY_LENGTH_CONST (first_glyphs) * ARRAY_LENGTH_CONST(ligature_table[0].ligatures)]; |
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unsigned int component_count_list[ARRAY_LENGTH_CONST (ligature_list)]; |
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OT::GlyphID component_list[ARRAY_LENGTH_CONST (ligature_list) * 1/* One extra component per ligature */]; |
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unsigned int num_ligatures = 0; |
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/* Populate arrays */ |
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/* Sort out the first-glyphs */ |
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for (unsigned int first_glyph_idx = 0; first_glyph_idx < ARRAY_LENGTH (first_glyphs); first_glyph_idx++) |
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{ |
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|
120 |
hb_codepoint_t first_u = ligature_table[first_glyph_idx].first; |
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|
121 |
hb_codepoint_t first_glyph; |
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|
122 |
if (!hb_font_get_glyph (font, first_u, 0, &first_glyph)) |
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|
123 |
continue; |
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|
124 |
first_glyphs[num_first_glyphs].set (first_glyph); |
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|
125 |
ligature_per_first_glyph_count_list[num_first_glyphs] = 0; |
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|
126 |
first_glyphs_indirection[num_first_glyphs] = first_glyph_idx; |
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|
127 |
num_first_glyphs++; |
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parents:
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changeset
|
128 |
} |
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|
129 |
hb_stable_sort (&first_glyphs[0], num_first_glyphs, OT::GlyphID::cmp, &first_glyphs_indirection[0]); |
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changeset
|
130 |
|
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parents:
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|
131 |
/* Now that the first-glyphs are sorted, walk again, populate ligatures. */ |
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|
132 |
for (unsigned int i = 0; i < num_first_glyphs; i++) |
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changeset
|
133 |
{ |
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|
134 |
unsigned int first_glyph_idx = first_glyphs_indirection[i]; |
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parents:
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changeset
|
135 |
|
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parents:
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changeset
|
136 |
for (unsigned int second_glyph_idx = 0; second_glyph_idx < ARRAY_LENGTH (ligature_table[0].ligatures); second_glyph_idx++) |
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|
137 |
{ |
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parents:
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|
138 |
hb_codepoint_t second_u = ligature_table[first_glyph_idx].ligatures[second_glyph_idx].second; |
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|
139 |
hb_codepoint_t ligature_u = ligature_table[first_glyph_idx].ligatures[second_glyph_idx].ligature; |
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|
140 |
hb_codepoint_t second_glyph, ligature_glyph; |
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|
141 |
if (!second_u || |
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|
142 |
!hb_font_get_glyph (font, second_u, 0, &second_glyph) || |
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parents:
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|
143 |
!hb_font_get_glyph (font, ligature_u, 0, &ligature_glyph)) |
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parents:
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|
144 |
continue; |
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parents:
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changeset
|
145 |
|
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|
146 |
ligature_per_first_glyph_count_list[i]++; |
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parents:
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changeset
|
147 |
|
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|
148 |
ligature_list[num_ligatures].set (ligature_glyph); |
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|
149 |
component_count_list[num_ligatures] = 2; |
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|
150 |
component_list[num_ligatures].set (second_glyph); |
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parents:
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|
151 |
num_ligatures++; |
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parents:
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changeset
|
152 |
} |
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parents:
diff
changeset
|
153 |
} |
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prr
parents:
diff
changeset
|
154 |
|
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prr
parents:
diff
changeset
|
155 |
if (!num_ligatures) |
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parents:
diff
changeset
|
156 |
return NULL; |
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prr
parents:
diff
changeset
|
157 |
|
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changeset
|
158 |
OT::Supplier<OT::GlyphID> first_glyphs_supplier (first_glyphs, num_first_glyphs); |
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parents:
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|
159 |
OT::Supplier<unsigned int > ligature_per_first_glyph_count_supplier (ligature_per_first_glyph_count_list, num_first_glyphs); |
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parents:
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|
160 |
OT::Supplier<OT::GlyphID> ligatures_supplier (ligature_list, num_ligatures); |
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parents:
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|
161 |
OT::Supplier<unsigned int > component_count_supplier (component_count_list, num_ligatures); |
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|
162 |
OT::Supplier<OT::GlyphID> component_supplier (component_list, num_ligatures); |
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parents:
diff
changeset
|
163 |
|
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prr
parents:
diff
changeset
|
164 |
/* 16 bytes per ligature ought to be enough... */ |
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parents:
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|
165 |
char buf[ARRAY_LENGTH_CONST (ligature_list) * 16 + 128]; |
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parents:
diff
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|
166 |
OT::hb_serialize_context_t c (buf, sizeof (buf)); |
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parents:
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|
167 |
OT::SubstLookup *lookup = c.start_serialize<OT::SubstLookup> (); |
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parents:
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|
168 |
bool ret = lookup->serialize_ligature (&c, |
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parents:
diff
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|
169 |
OT::LookupFlag::IgnoreMarks, |
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|
170 |
first_glyphs_supplier, |
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parents:
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|
171 |
ligature_per_first_glyph_count_supplier, |
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parents:
diff
changeset
|
172 |
num_first_glyphs, |
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parents:
diff
changeset
|
173 |
ligatures_supplier, |
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prr
parents:
diff
changeset
|
174 |
component_count_supplier, |
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prr
parents:
diff
changeset
|
175 |
component_supplier); |
e496a8d8fc8a
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prr
parents:
diff
changeset
|
176 |
|
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prr
parents:
diff
changeset
|
177 |
c.end_serialize (); |
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prr
parents:
diff
changeset
|
178 |
/* TODO sanitize the results? */ |
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prr
parents:
diff
changeset
|
179 |
|
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diff
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|
180 |
return ret ? c.copy<OT::SubstLookup> () : NULL; |
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parents:
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changeset
|
181 |
} |
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prr
parents:
diff
changeset
|
182 |
|
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prr
parents:
diff
changeset
|
183 |
static OT::SubstLookup * |
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parents:
diff
changeset
|
184 |
arabic_fallback_synthesize_lookup (const hb_ot_shape_plan_t *plan, |
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|
185 |
hb_font_t *font, |
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parents:
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|
186 |
unsigned int feature_index) |
e496a8d8fc8a
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parents:
diff
changeset
|
187 |
{ |
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prr
parents:
diff
changeset
|
188 |
if (feature_index < 4) |
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parents:
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changeset
|
189 |
return arabic_fallback_synthesize_lookup_single (plan, font, feature_index); |
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parents:
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changeset
|
190 |
else |
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parents:
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changeset
|
191 |
return arabic_fallback_synthesize_lookup_ligature (plan, font); |
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parents:
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changeset
|
192 |
} |
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prr
parents:
diff
changeset
|
193 |
|
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parents:
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changeset
|
194 |
#define ARABIC_FALLBACK_MAX_LOOKUPS 5 |
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changeset
|
195 |
|
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parents:
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changeset
|
196 |
struct arabic_fallback_plan_t |
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changeset
|
197 |
{ |
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parents:
diff
changeset
|
198 |
ASSERT_POD (); |
e496a8d8fc8a
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prr
parents:
diff
changeset
|
199 |
|
e496a8d8fc8a
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prr
parents:
diff
changeset
|
200 |
unsigned int num_lookups; |
e496a8d8fc8a
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prr
parents:
diff
changeset
|
201 |
bool free_lookups; |
e496a8d8fc8a
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prr
parents:
diff
changeset
|
202 |
|
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prr
parents:
diff
changeset
|
203 |
hb_mask_t mask_array[ARABIC_FALLBACK_MAX_LOOKUPS]; |
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parents:
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changeset
|
204 |
OT::SubstLookup *lookup_array[ARABIC_FALLBACK_MAX_LOOKUPS]; |
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parents:
diff
changeset
|
205 |
hb_ot_layout_lookup_accelerator_t accel_array[ARABIC_FALLBACK_MAX_LOOKUPS]; |
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parents:
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changeset
|
206 |
}; |
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prr
parents:
diff
changeset
|
207 |
|
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|
208 |
static const arabic_fallback_plan_t arabic_fallback_plan_nil = {}; |
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changeset
|
209 |
|
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changeset
|
210 |
#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(HB_NO_WIN1256) |
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parents:
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changeset
|
211 |
#define HB_WITH_WIN1256 |
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parents:
diff
changeset
|
212 |
#endif |
e496a8d8fc8a
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prr
parents:
diff
changeset
|
213 |
|
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prr
parents:
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changeset
|
214 |
#ifdef HB_WITH_WIN1256 |
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changeset
|
215 |
#include "hb-ot-shape-complex-arabic-win1256.hh" |
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diff
changeset
|
216 |
#endif |
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prr
parents:
diff
changeset
|
217 |
|
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diff
changeset
|
218 |
struct ManifestLookup { |
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parents:
diff
changeset
|
219 |
OT::Tag tag; |
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parents:
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changeset
|
220 |
OT::OffsetTo<OT::SubstLookup> lookupOffset; |
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parents:
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|
221 |
}; |
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|
222 |
typedef OT::ArrayOf<ManifestLookup> Manifest; |
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changeset
|
223 |
|
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|
224 |
static bool |
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prr
parents:
diff
changeset
|
225 |
arabic_fallback_plan_init_win1256 (arabic_fallback_plan_t *fallback_plan, |
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|
226 |
const hb_ot_shape_plan_t *plan, |
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|
227 |
hb_font_t *font) |
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parents:
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changeset
|
228 |
{ |
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parents:
diff
changeset
|
229 |
#ifdef HB_WITH_WIN1256 |
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diff
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|
230 |
/* Does this font look like it's Windows-1256-encoded? */ |
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parents:
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|
231 |
hb_codepoint_t g; |
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diff
changeset
|
232 |
if (!(hb_font_get_glyph (font, 0x0627u, 0, &g) && g == 199 /* ALEF */ && |
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parents:
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|
233 |
hb_font_get_glyph (font, 0x0644u, 0, &g) && g == 225 /* LAM */ && |
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parents:
diff
changeset
|
234 |
hb_font_get_glyph (font, 0x0649u, 0, &g) && g == 236 /* ALEF MAKSURA */ && |
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prr
parents:
diff
changeset
|
235 |
hb_font_get_glyph (font, 0x064Au, 0, &g) && g == 237 /* YEH */ && |
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prr
parents:
diff
changeset
|
236 |
hb_font_get_glyph (font, 0x0652u, 0, &g) && g == 250 /* SUKUN */)) |
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parents:
diff
changeset
|
237 |
return false; |
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238 |
|
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const Manifest &manifest = reinterpret_cast<const Manifest&> (arabic_win1256_gsub_lookups.manifest); |
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ASSERT_STATIC (sizeof (arabic_win1256_gsub_lookups.manifestData) / sizeof (ManifestLookup) |
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<= ARABIC_FALLBACK_MAX_LOOKUPS); |
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242 |
/* TODO sanitize the table? */ |
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243 |
|
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unsigned j = 0; |
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unsigned int count = manifest.len; |
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for (unsigned int i = 0; i < count; i++) |
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{ |
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fallback_plan->mask_array[j] = plan->map.get_1_mask (manifest[i].tag); |
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if (fallback_plan->mask_array[j]) |
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250 |
{ |
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fallback_plan->lookup_array[j] = const_cast<OT::SubstLookup*> (&(&manifest+manifest[i].lookupOffset)); |
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252 |
if (fallback_plan->lookup_array[j]) |
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253 |
{ |
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254 |
fallback_plan->accel_array[j].init (*fallback_plan->lookup_array[j]); |
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255 |
j++; |
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256 |
} |
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257 |
} |
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258 |
} |
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259 |
|
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fallback_plan->num_lookups = j; |
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261 |
fallback_plan->free_lookups = false; |
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262 |
|
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return j > 0; |
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264 |
#else |
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return false; |
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266 |
#endif |
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267 |
} |
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268 |
|
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269 |
static bool |
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270 |
arabic_fallback_plan_init_unicode (arabic_fallback_plan_t *fallback_plan, |
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const hb_ot_shape_plan_t *plan, |
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hb_font_t *font) |
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273 |
{ |
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ASSERT_STATIC (ARRAY_LENGTH_CONST(arabic_fallback_features) <= ARABIC_FALLBACK_MAX_LOOKUPS); |
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unsigned int j = 0; |
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276 |
for (unsigned int i = 0; i < ARRAY_LENGTH(arabic_fallback_features) ; i++) |
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277 |
{ |
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278 |
fallback_plan->mask_array[j] = plan->map.get_1_mask (arabic_fallback_features[i]); |
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279 |
if (fallback_plan->mask_array[j]) |
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280 |
{ |
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fallback_plan->lookup_array[j] = arabic_fallback_synthesize_lookup (plan, font, i); |
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282 |
if (fallback_plan->lookup_array[j]) |
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283 |
{ |
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284 |
fallback_plan->accel_array[j].init (*fallback_plan->lookup_array[j]); |
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285 |
j++; |
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286 |
} |
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287 |
} |
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288 |
} |
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289 |
|
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fallback_plan->num_lookups = j; |
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291 |
fallback_plan->free_lookups = true; |
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292 |
|
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293 |
return j > 0; |
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294 |
} |
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295 |
|
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296 |
static arabic_fallback_plan_t * |
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297 |
arabic_fallback_plan_create (const hb_ot_shape_plan_t *plan, |
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298 |
hb_font_t *font) |
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299 |
{ |
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arabic_fallback_plan_t *fallback_plan = (arabic_fallback_plan_t *) calloc (1, sizeof (arabic_fallback_plan_t)); |
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301 |
if (unlikely (!fallback_plan)) |
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302 |
return const_cast<arabic_fallback_plan_t *> (&arabic_fallback_plan_nil); |
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303 |
|
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304 |
fallback_plan->num_lookups = 0; |
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305 |
fallback_plan->free_lookups = false; |
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306 |
|
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307 |
/* Try synthesizing GSUB table using Unicode Arabic Presentation Forms, |
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308 |
* in case the font has cmap entries for the presentation-forms characters. */ |
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309 |
if (arabic_fallback_plan_init_unicode (fallback_plan, plan, font)) |
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310 |
return fallback_plan; |
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311 |
|
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312 |
/* See if this looks like a Windows-1256-encoded font. If it does, use a |
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* hand-coded GSUB table. */ |
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|
314 |
if (arabic_fallback_plan_init_win1256 (fallback_plan, plan, font)) |
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315 |
return fallback_plan; |
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316 |
|
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317 |
free (fallback_plan); |
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|
318 |
return const_cast<arabic_fallback_plan_t *> (&arabic_fallback_plan_nil); |
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319 |
} |
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320 |
|
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321 |
static void |
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322 |
arabic_fallback_plan_destroy (arabic_fallback_plan_t *fallback_plan) |
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323 |
{ |
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|
324 |
if (!fallback_plan || fallback_plan == &arabic_fallback_plan_nil) |
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|
325 |
return; |
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326 |
|
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|
327 |
for (unsigned int i = 0; i < fallback_plan->num_lookups; i++) |
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|
328 |
if (fallback_plan->lookup_array[i]) |
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329 |
{ |
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|
330 |
fallback_plan->accel_array[i].fini (); |
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|
331 |
if (fallback_plan->free_lookups) |
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|
332 |
free (fallback_plan->lookup_array[i]); |
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|
333 |
} |
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|
334 |
|
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|
335 |
free (fallback_plan); |
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|
336 |
} |
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|
337 |
|
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338 |
static void |
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339 |
arabic_fallback_plan_shape (arabic_fallback_plan_t *fallback_plan, |
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340 |
hb_font_t *font, |
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341 |
hb_buffer_t *buffer) |
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342 |
{ |
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343 |
OT::hb_apply_context_t c (0, font, buffer); |
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344 |
for (unsigned int i = 0; i < fallback_plan->num_lookups; i++) |
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|
345 |
if (fallback_plan->lookup_array[i]) { |
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346 |
c.set_lookup_mask (fallback_plan->mask_array[i]); |
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347 |
hb_ot_layout_substitute_lookup (&c, |
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348 |
*fallback_plan->lookup_array[i], |
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349 |
fallback_plan->accel_array[i]); |
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|
350 |
} |
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351 |
} |
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352 |
|
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353 |
|
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354 |
#endif /* HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH */ |