#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('r','l','i','g'),
};
-/* Same order as the fallback feature array */
-enum {
- FALLBACK_INIT,
- FALLBACK_MEDI,
- FALLBACK_FINA,
- FALLBACK_ISOL,
- FALLBACK_RLIG,
- ARABIC_NUM_FALLBACK_FEATURES
-};
-
static OT::SubstLookup *
arabic_fallback_synthesize_lookup_single (const hb_ot_shape_plan_t *plan HB_UNUSED,
hb_font_t *font,
!hb_font_get_glyph (font, u, 0, &u_glyph) ||
!hb_font_get_glyph (font, s, 0, &s_glyph) ||
u_glyph == s_glyph ||
- u_glyph > 0xFFFF || s_glyph > 0xFFFF)
+ u_glyph > 0xFFFFu || s_glyph > 0xFFFFu)
continue;
glyphs[num_glyphs].set (u_glyph);
num_glyphs++;
}
+ if (!num_glyphs)
+ return NULL;
+
/* Bubble-sort!
* May not be good-enough for presidential candidate interviews, but good-enough for us... */
hb_bubble_sort (&glyphs[0], num_glyphs, OT::GlyphID::cmp, &substitutes[0]);
}
}
+ if (!num_ligatures)
+ return NULL;
+
OT::Supplier<OT::GlyphID> first_glyphs_supplier (first_glyphs, num_first_glyphs);
OT::Supplier<unsigned int > ligature_per_first_glyph_count_supplier (ligature_per_first_glyph_count_list, num_first_glyphs);
OT::Supplier<OT::GlyphID> ligatures_supplier (ligature_list, num_ligatures);
return arabic_fallback_synthesize_lookup_ligature (plan, font);
}
+#define ARABIC_FALLBACK_MAX_LOOKUPS 5
+
struct arabic_fallback_plan_t
{
ASSERT_POD ();
- hb_mask_t mask_array[ARABIC_NUM_FALLBACK_FEATURES];
- OT::SubstLookup *lookup_array[ARABIC_NUM_FALLBACK_FEATURES];
- hb_set_digest_t digest_array[ARABIC_NUM_FALLBACK_FEATURES];
+ unsigned int num_lookups;
+ bool free_lookups;
+
+ hb_mask_t mask_array[ARABIC_FALLBACK_MAX_LOOKUPS];
+ OT::SubstLookup *lookup_array[ARABIC_FALLBACK_MAX_LOOKUPS];
+ hb_ot_layout_lookup_accelerator_t accel_array[ARABIC_FALLBACK_MAX_LOOKUPS];
};
static const arabic_fallback_plan_t arabic_fallback_plan_nil = {};
+#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(HB_WITH_WIN1256)
+#define HB_WITH_WIN1256
+#endif
+
+#ifdef HB_WITH_WIN1256
+#include "hb-ot-shape-complex-arabic-win1256.hh"
+#endif
+
+struct ManifestLookup {
+ OT::Tag tag;
+ OT::OffsetTo<OT::SubstLookup> lookupOffset;
+};
+typedef OT::ArrayOf<ManifestLookup> Manifest;
+
+static bool
+arabic_fallback_plan_init_win1256 (arabic_fallback_plan_t *fallback_plan,
+ const hb_ot_shape_plan_t *plan,
+ hb_font_t *font)
+{
+#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<const Manifest&> (arabic_win1256_gsub_lookups.manifest);
+ ASSERT_STATIC (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<OT::SubstLookup*> (&(&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)
+{
+ ASSERT_STATIC (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)
if (unlikely (!fallback_plan))
return const_cast<arabic_fallback_plan_t *> (&arabic_fallback_plan_nil);
- for (unsigned int i = 0; i < ARABIC_NUM_FALLBACK_FEATURES; i++) {
- fallback_plan->mask_array[i] = plan->map.get_1_mask (arabic_fallback_features[i]);
- if (fallback_plan->mask_array[i]) {
- fallback_plan->lookup_array[i] = arabic_fallback_synthesize_lookup (plan, font, i);
- if (fallback_plan->lookup_array[i])
- fallback_plan->lookup_array[i]->add_coverage (&fallback_plan->digest_array[i]);
- }
- }
+ 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;
- 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;
+
+ free (fallback_plan);
+ return const_cast<arabic_fallback_plan_t *> (&arabic_fallback_plan_nil);
}
static void
if (!fallback_plan || fallback_plan == &arabic_fallback_plan_nil)
return;
- for (unsigned int i = 0; i < ARABIC_NUM_FALLBACK_FEATURES; i++)
+ for (unsigned int i = 0; i < fallback_plan->num_lookups; i++)
if (fallback_plan->lookup_array[i])
- free (fallback_plan->lookup_array[i]);
+ {
+ fallback_plan->accel_array[i].fini (fallback_plan->lookup_array[i]);
+ if (fallback_plan->free_lookups)
+ free (fallback_plan->lookup_array[i]);
+ }
free (fallback_plan);
}
hb_font_t *font,
hb_buffer_t *buffer)
{
- for (unsigned int i = 0; i < ARABIC_NUM_FALLBACK_FEATURES; i++)
+ OT::hb_apply_context_t c (0, font, buffer);
+ for (unsigned int i = 0; i < fallback_plan->num_lookups; i++)
if (fallback_plan->lookup_array[i]) {
- OT::hb_apply_context_t c (font, buffer, fallback_plan->mask_array[i]);
- fallback_plan->lookup_array[i]->apply_string (&c, &fallback_plan->digest_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]);
}
}
projects / platform / upstream / harfbuzz.git / blobdiff