--- old/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ot-shape-complex-arabic-fallback.hh 2020-07-21 14:25:51.486861495 -0700 +++ /dev/null 2020-01-23 11:31:37.155195123 -0800 @@ -1,345 +0,0 @@ -/* - * Copyright © 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. - * - * Google Author(s): Behdad Esfahbod - */ - -#ifndef HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH -#define HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH - -#include "hb.hh" - -#include "hb-ot-shape.hh" -#include "hb-ot-layout-gsub-table.hh" - - -/* Features ordered the same as the entries in shaping_table rows, - * followed by rlig. Don't change. */ -static const hb_tag_t arabic_fallback_features[] = -{ - HB_TAG('i','n','i','t'), - HB_TAG('m','e','d','i'), - HB_TAG('f','i','n','a'), - HB_TAG('i','s','o','l'), - HB_TAG('r','l','i','g'), -}; - -static OT::SubstLookup * -arabic_fallback_synthesize_lookup_single (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font, - unsigned int feature_index) -{ - OT::GlyphID glyphs[SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1]; - OT::GlyphID substitutes[SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1]; - unsigned int num_glyphs = 0; - - /* Populate arrays */ - for (hb_codepoint_t u = SHAPING_TABLE_FIRST; u < SHAPING_TABLE_LAST + 1; u++) - { - hb_codepoint_t s = shaping_table[u - SHAPING_TABLE_FIRST][feature_index]; - hb_codepoint_t u_glyph, s_glyph; - - if (!s || - !hb_font_get_glyph (font, u, 0, &u_glyph) || - !hb_font_get_glyph (font, s, 0, &s_glyph) || - u_glyph == s_glyph || - u_glyph > 0xFFFFu || s_glyph > 0xFFFFu) - continue; - - glyphs[num_glyphs].set (u_glyph); - substitutes[num_glyphs].set (s_glyph); - - num_glyphs++; - } - - if (!num_glyphs) - return nullptr; - - /* Bubble-sort or something equally good! - * May not be good-enough for presidential candidate interviews, but good-enough for us... */ - hb_stable_sort (&glyphs[0], num_glyphs, (int(*)(const OT::GlyphID*, const OT::GlyphID *)) OT::GlyphID::cmp, &substitutes[0]); - - - /* Each glyph takes four bytes max, and there's some overhead. */ - char buf[(SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1) * 4 + 128]; - hb_serialize_context_t c (buf, sizeof (buf)); - OT::SubstLookup *lookup = c.start_serialize (); - bool ret = lookup->serialize_single (&c, - OT::LookupFlag::IgnoreMarks, - hb_array (glyphs, num_glyphs), - hb_array (substitutes, num_glyphs)); - c.end_serialize (); - /* TODO sanitize the results? */ - - return ret ? c.copy () : nullptr; -} - -static OT::SubstLookup * -arabic_fallback_synthesize_lookup_ligature (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font) -{ - OT::GlyphID first_glyphs[ARRAY_LENGTH_CONST (ligature_table)]; - unsigned int first_glyphs_indirection[ARRAY_LENGTH_CONST (ligature_table)]; - unsigned int ligature_per_first_glyph_count_list[ARRAY_LENGTH_CONST (first_glyphs)]; - unsigned int num_first_glyphs = 0; - - /* We know that all our ligatures are 2-component */ - OT::GlyphID ligature_list[ARRAY_LENGTH_CONST (first_glyphs) * ARRAY_LENGTH_CONST(ligature_table[0].ligatures)]; - unsigned int component_count_list[ARRAY_LENGTH_CONST (ligature_list)]; - OT::GlyphID component_list[ARRAY_LENGTH_CONST (ligature_list) * 1/* One extra component per ligature */]; - unsigned int num_ligatures = 0; - - /* Populate arrays */ - - /* Sort out the first-glyphs */ - for (unsigned int first_glyph_idx = 0; first_glyph_idx < ARRAY_LENGTH (first_glyphs); first_glyph_idx++) - { - hb_codepoint_t first_u = ligature_table[first_glyph_idx].first; - hb_codepoint_t first_glyph; - if (!hb_font_get_glyph (font, first_u, 0, &first_glyph)) - continue; - first_glyphs[num_first_glyphs].set (first_glyph); - ligature_per_first_glyph_count_list[num_first_glyphs] = 0; - first_glyphs_indirection[num_first_glyphs] = first_glyph_idx; - num_first_glyphs++; - } - hb_stable_sort (&first_glyphs[0], num_first_glyphs, (int(*)(const OT::GlyphID*, const OT::GlyphID *)) OT::GlyphID::cmp, &first_glyphs_indirection[0]); - - /* Now that the first-glyphs are sorted, walk again, populate ligatures. */ - for (unsigned int i = 0; i < num_first_glyphs; i++) - { - unsigned int first_glyph_idx = first_glyphs_indirection[i]; - - for (unsigned int second_glyph_idx = 0; second_glyph_idx < ARRAY_LENGTH (ligature_table[0].ligatures); second_glyph_idx++) - { - hb_codepoint_t second_u = ligature_table[first_glyph_idx].ligatures[second_glyph_idx].second; - hb_codepoint_t ligature_u = ligature_table[first_glyph_idx].ligatures[second_glyph_idx].ligature; - hb_codepoint_t second_glyph, ligature_glyph; - if (!second_u || - !hb_font_get_glyph (font, second_u, 0, &second_glyph) || - !hb_font_get_glyph (font, ligature_u, 0, &ligature_glyph)) - continue; - - ligature_per_first_glyph_count_list[i]++; - - ligature_list[num_ligatures].set (ligature_glyph); - component_count_list[num_ligatures] = 2; - component_list[num_ligatures].set (second_glyph); - num_ligatures++; - } - } - - if (!num_ligatures) - return nullptr; - - - /* 16 bytes per ligature ought to be enough... */ - char buf[ARRAY_LENGTH_CONST (ligature_list) * 16 + 128]; - hb_serialize_context_t c (buf, sizeof (buf)); - OT::SubstLookup *lookup = c.start_serialize (); - bool ret = lookup->serialize_ligature (&c, - OT::LookupFlag::IgnoreMarks, - hb_array (first_glyphs, num_first_glyphs), - hb_array (ligature_per_first_glyph_count_list, num_first_glyphs), - hb_array (ligature_list, num_ligatures), - hb_array (component_count_list, num_ligatures), - hb_array (component_list, num_ligatures)); - c.end_serialize (); - /* TODO sanitize the results? */ - - return ret ? c.copy () : nullptr; -} - -static OT::SubstLookup * -arabic_fallback_synthesize_lookup (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - unsigned int feature_index) -{ - if (feature_index < 4) - return arabic_fallback_synthesize_lookup_single (plan, font, feature_index); - else - return arabic_fallback_synthesize_lookup_ligature (plan, font); -} - -#define ARABIC_FALLBACK_MAX_LOOKUPS 5 - -struct arabic_fallback_plan_t -{ - unsigned int num_lookups; - bool free_lookups; - - hb_mask_t mask_array[ARABIC_FALLBACK_MAX_LOOKUPS]; - OT::SubstLookup *lookup_array[ARABIC_FALLBACK_MAX_LOOKUPS]; - OT::hb_ot_layout_lookup_accelerator_t accel_array[ARABIC_FALLBACK_MAX_LOOKUPS]; -}; - -#if defined(_WIN32) && !defined(HB_NO_WIN1256) -#define HB_WITH_WIN1256 -#endif - -#ifdef HB_WITH_WIN1256 -#include "hb-ot-shape-complex-arabic-win1256.hh" -#endif - -struct ManifestLookup -{ - public: - OT::Tag tag; - OT::OffsetTo lookupOffset; - public: - DEFINE_SIZE_STATIC (6); -}; -typedef OT::ArrayOf Manifest; - -static bool -arabic_fallback_plan_init_win1256 (arabic_fallback_plan_t *fallback_plan HB_UNUSED, - const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font HB_UNUSED) -{ -#ifdef HB_WITH_WIN1256 - /* Does this font look like it's Windows-1256-encoded? */ - hb_codepoint_t g; - if (!(hb_font_get_glyph (font, 0x0627u, 0, &g) && g == 199 /* ALEF */ && - hb_font_get_glyph (font, 0x0644u, 0, &g) && g == 225 /* LAM */ && - hb_font_get_glyph (font, 0x0649u, 0, &g) && g == 236 /* ALEF MAKSURA */ && - hb_font_get_glyph (font, 0x064Au, 0, &g) && g == 237 /* YEH */ && - hb_font_get_glyph (font, 0x0652u, 0, &g) && g == 250 /* SUKUN */)) - return false; - - const Manifest &manifest = reinterpret_cast (arabic_win1256_gsub_lookups.manifest); - static_assert (sizeof (arabic_win1256_gsub_lookups.manifestData) / sizeof (ManifestLookup) - <= ARABIC_FALLBACK_MAX_LOOKUPS, ""); - /* TODO sanitize the table? */ - - unsigned j = 0; - unsigned int count = manifest.len; - for (unsigned int i = 0; i < count; i++) - { - fallback_plan->mask_array[j] = plan->map.get_1_mask (manifest[i].tag); - if (fallback_plan->mask_array[j]) - { - fallback_plan->lookup_array[j] = const_cast (&(&manifest+manifest[i].lookupOffset)); - if (fallback_plan->lookup_array[j]) - { - fallback_plan->accel_array[j].init (*fallback_plan->lookup_array[j]); - j++; - } - } - } - - fallback_plan->num_lookups = j; - fallback_plan->free_lookups = false; - - return j > 0; -#else - return false; -#endif -} - -static bool -arabic_fallback_plan_init_unicode (arabic_fallback_plan_t *fallback_plan, - const hb_ot_shape_plan_t *plan, - hb_font_t *font) -{ - static_assert ((ARRAY_LENGTH_CONST(arabic_fallback_features) <= ARABIC_FALLBACK_MAX_LOOKUPS), ""); - unsigned int j = 0; - for (unsigned int i = 0; i < ARRAY_LENGTH(arabic_fallback_features) ; i++) - { - fallback_plan->mask_array[j] = plan->map.get_1_mask (arabic_fallback_features[i]); - if (fallback_plan->mask_array[j]) - { - fallback_plan->lookup_array[j] = arabic_fallback_synthesize_lookup (plan, font, i); - if (fallback_plan->lookup_array[j]) - { - fallback_plan->accel_array[j].init (*fallback_plan->lookup_array[j]); - j++; - } - } - } - - fallback_plan->num_lookups = j; - fallback_plan->free_lookups = true; - - return j > 0; -} - -static arabic_fallback_plan_t * -arabic_fallback_plan_create (const hb_ot_shape_plan_t *plan, - hb_font_t *font) -{ - arabic_fallback_plan_t *fallback_plan = (arabic_fallback_plan_t *) calloc (1, sizeof (arabic_fallback_plan_t)); - if (unlikely (!fallback_plan)) - return const_cast (&Null(arabic_fallback_plan_t)); - - fallback_plan->num_lookups = 0; - fallback_plan->free_lookups = false; - - /* Try synthesizing GSUB table using Unicode Arabic Presentation Forms, - * in case the font has cmap entries for the presentation-forms characters. */ - if (arabic_fallback_plan_init_unicode (fallback_plan, plan, font)) - return fallback_plan; - - /* See if this looks like a Windows-1256-encoded font. If it does, use a - * hand-coded GSUB table. */ - if (arabic_fallback_plan_init_win1256 (fallback_plan, plan, font)) - return fallback_plan; - - assert (fallback_plan->num_lookups == 0); - free (fallback_plan); - return const_cast (&Null(arabic_fallback_plan_t)); -} - -static void -arabic_fallback_plan_destroy (arabic_fallback_plan_t *fallback_plan) -{ - if (!fallback_plan || fallback_plan->num_lookups == 0) - return; - - for (unsigned int i = 0; i < fallback_plan->num_lookups; i++) - if (fallback_plan->lookup_array[i]) - { - fallback_plan->accel_array[i].fini (); - if (fallback_plan->free_lookups) - free (fallback_plan->lookup_array[i]); - } - - free (fallback_plan); -} - -static void -arabic_fallback_plan_shape (arabic_fallback_plan_t *fallback_plan, - hb_font_t *font, - hb_buffer_t *buffer) -{ - OT::hb_ot_apply_context_t c (0, font, buffer); - for (unsigned int i = 0; i < fallback_plan->num_lookups; i++) - if (fallback_plan->lookup_array[i]) { - c.set_lookup_mask (fallback_plan->mask_array[i]); - hb_ot_layout_substitute_lookup (&c, - *fallback_plan->lookup_array[i], - fallback_plan->accel_array[i]); - } -} - - -#endif /* HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH */ --- /dev/null 2020-01-23 11:31:37.155195123 -0800 +++ new/src/java.desktop/share/native/libharfbuzz/hb-ot-shape-complex-arabic-fallback.hh 2020-07-21 14:25:51.134861500 -0700 @@ -0,0 +1,345 @@ +/* + * Copyright © 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. + * + * Google Author(s): Behdad Esfahbod + */ + +#ifndef HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH +#define HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH + +#include "hb.hh" + +#include "hb-ot-shape.hh" +#include "hb-ot-layout-gsub-table.hh" + + +/* Features ordered the same as the entries in shaping_table rows, + * followed by rlig. Don't change. */ +static const hb_tag_t arabic_fallback_features[] = +{ + HB_TAG('i','n','i','t'), + HB_TAG('m','e','d','i'), + HB_TAG('f','i','n','a'), + HB_TAG('i','s','o','l'), + HB_TAG('r','l','i','g'), +}; + +static OT::SubstLookup * +arabic_fallback_synthesize_lookup_single (const hb_ot_shape_plan_t *plan HB_UNUSED, + hb_font_t *font, + unsigned int feature_index) +{ + OT::GlyphID glyphs[SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1]; + OT::GlyphID substitutes[SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1]; + unsigned int num_glyphs = 0; + + /* Populate arrays */ + for (hb_codepoint_t u = SHAPING_TABLE_FIRST; u < SHAPING_TABLE_LAST + 1; u++) + { + hb_codepoint_t s = shaping_table[u - SHAPING_TABLE_FIRST][feature_index]; + hb_codepoint_t u_glyph, s_glyph; + + if (!s || + !hb_font_get_glyph (font, u, 0, &u_glyph) || + !hb_font_get_glyph (font, s, 0, &s_glyph) || + u_glyph == s_glyph || + u_glyph > 0xFFFFu || s_glyph > 0xFFFFu) + continue; + + glyphs[num_glyphs].set (u_glyph); + substitutes[num_glyphs].set (s_glyph); + + num_glyphs++; + } + + if (!num_glyphs) + return nullptr; + + /* Bubble-sort or something equally good! + * May not be good-enough for presidential candidate interviews, but good-enough for us... */ + hb_stable_sort (&glyphs[0], num_glyphs, (int(*)(const OT::GlyphID*, const OT::GlyphID *)) OT::GlyphID::cmp, &substitutes[0]); + + + /* Each glyph takes four bytes max, and there's some overhead. */ + char buf[(SHAPING_TABLE_LAST - SHAPING_TABLE_FIRST + 1) * 4 + 128]; + hb_serialize_context_t c (buf, sizeof (buf)); + OT::SubstLookup *lookup = c.start_serialize (); + bool ret = lookup->serialize_single (&c, + OT::LookupFlag::IgnoreMarks, + hb_array (glyphs, num_glyphs), + hb_array (substitutes, num_glyphs)); + c.end_serialize (); + /* TODO sanitize the results? */ + + return ret ? c.copy () : nullptr; +} + +static OT::SubstLookup * +arabic_fallback_synthesize_lookup_ligature (const hb_ot_shape_plan_t *plan HB_UNUSED, + hb_font_t *font) +{ + OT::GlyphID first_glyphs[ARRAY_LENGTH_CONST (ligature_table)]; + unsigned int first_glyphs_indirection[ARRAY_LENGTH_CONST (ligature_table)]; + unsigned int ligature_per_first_glyph_count_list[ARRAY_LENGTH_CONST (first_glyphs)]; + unsigned int num_first_glyphs = 0; + + /* We know that all our ligatures are 2-component */ + OT::GlyphID ligature_list[ARRAY_LENGTH_CONST (first_glyphs) * ARRAY_LENGTH_CONST(ligature_table[0].ligatures)]; + unsigned int component_count_list[ARRAY_LENGTH_CONST (ligature_list)]; + OT::GlyphID component_list[ARRAY_LENGTH_CONST (ligature_list) * 1/* One extra component per ligature */]; + unsigned int num_ligatures = 0; + + /* Populate arrays */ + + /* Sort out the first-glyphs */ + for (unsigned int first_glyph_idx = 0; first_glyph_idx < ARRAY_LENGTH (first_glyphs); first_glyph_idx++) + { + hb_codepoint_t first_u = ligature_table[first_glyph_idx].first; + hb_codepoint_t first_glyph; + if (!hb_font_get_glyph (font, first_u, 0, &first_glyph)) + continue; + first_glyphs[num_first_glyphs].set (first_glyph); + ligature_per_first_glyph_count_list[num_first_glyphs] = 0; + first_glyphs_indirection[num_first_glyphs] = first_glyph_idx; + num_first_glyphs++; + } + hb_stable_sort (&first_glyphs[0], num_first_glyphs, (int(*)(const OT::GlyphID*, const OT::GlyphID *)) OT::GlyphID::cmp, &first_glyphs_indirection[0]); + + /* Now that the first-glyphs are sorted, walk again, populate ligatures. */ + for (unsigned int i = 0; i < num_first_glyphs; i++) + { + unsigned int first_glyph_idx = first_glyphs_indirection[i]; + + for (unsigned int second_glyph_idx = 0; second_glyph_idx < ARRAY_LENGTH (ligature_table[0].ligatures); second_glyph_idx++) + { + hb_codepoint_t second_u = ligature_table[first_glyph_idx].ligatures[second_glyph_idx].second; + hb_codepoint_t ligature_u = ligature_table[first_glyph_idx].ligatures[second_glyph_idx].ligature; + hb_codepoint_t second_glyph, ligature_glyph; + if (!second_u || + !hb_font_get_glyph (font, second_u, 0, &second_glyph) || + !hb_font_get_glyph (font, ligature_u, 0, &ligature_glyph)) + continue; + + ligature_per_first_glyph_count_list[i]++; + + ligature_list[num_ligatures].set (ligature_glyph); + component_count_list[num_ligatures] = 2; + component_list[num_ligatures].set (second_glyph); + num_ligatures++; + } + } + + if (!num_ligatures) + return nullptr; + + + /* 16 bytes per ligature ought to be enough... */ + char buf[ARRAY_LENGTH_CONST (ligature_list) * 16 + 128]; + hb_serialize_context_t c (buf, sizeof (buf)); + OT::SubstLookup *lookup = c.start_serialize (); + bool ret = lookup->serialize_ligature (&c, + OT::LookupFlag::IgnoreMarks, + hb_array (first_glyphs, num_first_glyphs), + hb_array (ligature_per_first_glyph_count_list, num_first_glyphs), + hb_array (ligature_list, num_ligatures), + hb_array (component_count_list, num_ligatures), + hb_array (component_list, num_ligatures)); + c.end_serialize (); + /* TODO sanitize the results? */ + + return ret ? c.copy () : nullptr; +} + +static OT::SubstLookup * +arabic_fallback_synthesize_lookup (const hb_ot_shape_plan_t *plan, + hb_font_t *font, + unsigned int feature_index) +{ + if (feature_index < 4) + return arabic_fallback_synthesize_lookup_single (plan, font, feature_index); + else + return arabic_fallback_synthesize_lookup_ligature (plan, font); +} + +#define ARABIC_FALLBACK_MAX_LOOKUPS 5 + +struct arabic_fallback_plan_t +{ + unsigned int num_lookups; + bool free_lookups; + + hb_mask_t mask_array[ARABIC_FALLBACK_MAX_LOOKUPS]; + OT::SubstLookup *lookup_array[ARABIC_FALLBACK_MAX_LOOKUPS]; + OT::hb_ot_layout_lookup_accelerator_t accel_array[ARABIC_FALLBACK_MAX_LOOKUPS]; +}; + +#if defined(_WIN32) && !defined(HB_NO_WIN1256) +#define HB_WITH_WIN1256 +#endif + +#ifdef HB_WITH_WIN1256 +#include "hb-ot-shape-complex-arabic-win1256.hh" +#endif + +struct ManifestLookup +{ + public: + OT::Tag tag; + OT::OffsetTo lookupOffset; + public: + DEFINE_SIZE_STATIC (6); +}; +typedef OT::ArrayOf Manifest; + +static bool +arabic_fallback_plan_init_win1256 (arabic_fallback_plan_t *fallback_plan HB_UNUSED, + const hb_ot_shape_plan_t *plan HB_UNUSED, + hb_font_t *font HB_UNUSED) +{ +#ifdef HB_WITH_WIN1256 + /* Does this font look like it's Windows-1256-encoded? */ + hb_codepoint_t g; + if (!(hb_font_get_glyph (font, 0x0627u, 0, &g) && g == 199 /* ALEF */ && + hb_font_get_glyph (font, 0x0644u, 0, &g) && g == 225 /* LAM */ && + hb_font_get_glyph (font, 0x0649u, 0, &g) && g == 236 /* ALEF MAKSURA */ && + hb_font_get_glyph (font, 0x064Au, 0, &g) && g == 237 /* YEH */ && + hb_font_get_glyph (font, 0x0652u, 0, &g) && g == 250 /* SUKUN */)) + return false; + + const Manifest &manifest = reinterpret_cast (arabic_win1256_gsub_lookups.manifest); + static_assert (sizeof (arabic_win1256_gsub_lookups.manifestData) / sizeof (ManifestLookup) + <= ARABIC_FALLBACK_MAX_LOOKUPS, ""); + /* TODO sanitize the table? */ + + unsigned j = 0; + unsigned int count = manifest.len; + for (unsigned int i = 0; i < count; i++) + { + fallback_plan->mask_array[j] = plan->map.get_1_mask (manifest[i].tag); + if (fallback_plan->mask_array[j]) + { + fallback_plan->lookup_array[j] = const_cast (&(&manifest+manifest[i].lookupOffset)); + if (fallback_plan->lookup_array[j]) + { + fallback_plan->accel_array[j].init (*fallback_plan->lookup_array[j]); + j++; + } + } + } + + fallback_plan->num_lookups = j; + fallback_plan->free_lookups = false; + + return j > 0; +#else + return false; +#endif +} + +static bool +arabic_fallback_plan_init_unicode (arabic_fallback_plan_t *fallback_plan, + const hb_ot_shape_plan_t *plan, + hb_font_t *font) +{ + static_assert ((ARRAY_LENGTH_CONST(arabic_fallback_features) <= ARABIC_FALLBACK_MAX_LOOKUPS), ""); + unsigned int j = 0; + for (unsigned int i = 0; i < ARRAY_LENGTH(arabic_fallback_features) ; i++) + { + fallback_plan->mask_array[j] = plan->map.get_1_mask (arabic_fallback_features[i]); + if (fallback_plan->mask_array[j]) + { + fallback_plan->lookup_array[j] = arabic_fallback_synthesize_lookup (plan, font, i); + if (fallback_plan->lookup_array[j]) + { + fallback_plan->accel_array[j].init (*fallback_plan->lookup_array[j]); + j++; + } + } + } + + fallback_plan->num_lookups = j; + fallback_plan->free_lookups = true; + + return j > 0; +} + +static arabic_fallback_plan_t * +arabic_fallback_plan_create (const hb_ot_shape_plan_t *plan, + hb_font_t *font) +{ + arabic_fallback_plan_t *fallback_plan = (arabic_fallback_plan_t *) calloc (1, sizeof (arabic_fallback_plan_t)); + if (unlikely (!fallback_plan)) + return const_cast (&Null(arabic_fallback_plan_t)); + + fallback_plan->num_lookups = 0; + fallback_plan->free_lookups = false; + + /* Try synthesizing GSUB table using Unicode Arabic Presentation Forms, + * in case the font has cmap entries for the presentation-forms characters. */ + if (arabic_fallback_plan_init_unicode (fallback_plan, plan, font)) + return fallback_plan; + + /* See if this looks like a Windows-1256-encoded font. If it does, use a + * hand-coded GSUB table. */ + if (arabic_fallback_plan_init_win1256 (fallback_plan, plan, font)) + return fallback_plan; + + assert (fallback_plan->num_lookups == 0); + free (fallback_plan); + return const_cast (&Null(arabic_fallback_plan_t)); +} + +static void +arabic_fallback_plan_destroy (arabic_fallback_plan_t *fallback_plan) +{ + if (!fallback_plan || fallback_plan->num_lookups == 0) + return; + + for (unsigned int i = 0; i < fallback_plan->num_lookups; i++) + if (fallback_plan->lookup_array[i]) + { + fallback_plan->accel_array[i].fini (); + if (fallback_plan->free_lookups) + free (fallback_plan->lookup_array[i]); + } + + free (fallback_plan); +} + +static void +arabic_fallback_plan_shape (arabic_fallback_plan_t *fallback_plan, + hb_font_t *font, + hb_buffer_t *buffer) +{ + OT::hb_ot_apply_context_t c (0, font, buffer); + for (unsigned int i = 0; i < fallback_plan->num_lookups; i++) + if (fallback_plan->lookup_array[i]) { + c.set_lookup_mask (fallback_plan->mask_array[i]); + hb_ot_layout_substitute_lookup (&c, + *fallback_plan->lookup_array[i], + fallback_plan->accel_array[i]); + } +} + + +#endif /* HB_OT_SHAPE_COMPLEX_ARABIC_FALLBACK_HH */