shaper: add UCDN support

Add explicit support for UCDN, without relying on any HarfBuzz
integration. This finally allows easy usage of HarfBuzz without glib,
ICU, or some other big bloated library!

3 files changed, 212 insertions, 1 deletions

diff --git a/libass/Makefile.am b/libass/Makefile.am
index 142de68..2b7cf55 100644
--- a/libass/Makefile.am
+++ b/libass/Makefile.am
@@ -11,7 +11,7 @@ libass_la_SOURCES = ass.c ass_cache.c ass_font.c ass_fontconfig.c ass_render.c \
                     ass_library.h ass_types.h ass_utils.h ass_drawing.c \
                     ass_drawing.h ass_cache_template.h ass_render.h \
                     ass_parse.c ass_parse.h ass_render_api.c ass_shaper.c \
-                    ass_shaper.h ass_strtod.c
+                    ass_shaper.h ass_strtod.c hb-ucdn.h
 libass_la_LDFLAGS = -version-info $(LIBASS_LT_CURRENT):$(LIBASS_LT_REVISION):$(LIBASS_LT_AGE)
 libass_la_LDFLAGS += -export-symbols $(srcdir)/libass.sym
 
diff --git a/libass/ass_shaper.c b/libass/ass_shaper.c
index 89ea97a..16f1c35 100644
--- a/libass/ass_shaper.c
+++ b/libass/ass_shaper.c
@@ -29,6 +29,9 @@
 #define MAX_RUNS 50
 
 #ifdef CONFIG_HARFBUZZ
+#ifdef CONFIG_UCDN
+#include "hb-ucdn.h"
+#endif
 #include <hb-ft.h>
 enum {
     VERT = 0,
@@ -57,6 +60,7 @@ struct ass_shaper {
 
     // Glyph metrics cache, to speed up shaping
     Cache *metrics_cache;
+    hb_unicode_funcs_t *unicode_funcs;
 #endif
 };
 
@@ -108,6 +112,9 @@ void ass_shaper_free(ASS_Shaper *shaper)
 {
 #ifdef CONFIG_HARFBUZZ
     ass_cache_done(shaper->metrics_cache);
+#ifdef CONFIG_UCDN
+    hb_unicode_funcs_destroy(shaper->unicode_funcs);
+#endif
     free(shaper->features);
 #endif
     free(shaper->event_text);
@@ -435,6 +442,9 @@ static void shape_harfbuzz(ASS_Shaper *shaper, GlyphInfo *glyphs, size_t len)
         runs[run].buf    = hb_buffer_create();
         runs[run].font   = get_hb_font(shaper, glyphs + k);
         set_run_features(shaper, glyphs + k);
+#ifdef CONFIG_UCDN
+        hb_buffer_set_unicode_funcs(runs[run].buf, shaper->unicode_funcs);
+#endif
         hb_buffer_pre_allocate(runs[run].buf, i - k + 1);
         hb_buffer_set_direction(runs[run].buf, direction ? HB_DIRECTION_RTL :
                 HB_DIRECTION_LTR);
@@ -662,6 +672,9 @@ ASS_Shaper *ass_shaper_new(size_t prealloc)
 #ifdef CONFIG_HARFBUZZ
     init_features(shaper);
     shaper->metrics_cache = ass_glyph_metrics_cache_create();
+#ifdef CONFIG_UCDN
+    shaper->unicode_funcs = hb_ucdn_make_unicode_funcs();
+#endif
 #endif
 
     return shaper;
diff --git a/libass/hb-ucdn.h b/libass/hb-ucdn.h
new file mode 100644
index 0000000..3a4abcd
--- /dev/null
+++ b/libass/hb-ucdn.h
@@ -0,0 +1,198 @@
+/*
+ * Copyright (C) 2012 Grigori Goronzy <greg@kinoho.net>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <hb.h>
+#include "ucdn.h"
+
+static const hb_script_t ucdn_script_translate[] = {
+    HB_SCRIPT_COMMON,
+    HB_SCRIPT_LATIN,
+    HB_SCRIPT_GREEK,
+    HB_SCRIPT_CYRILLIC,
+    HB_SCRIPT_ARMENIAN,
+    HB_SCRIPT_HEBREW,
+    HB_SCRIPT_ARABIC,
+    HB_SCRIPT_SYRIAC,
+    HB_SCRIPT_THAANA,
+    HB_SCRIPT_DEVANAGARI,
+    HB_SCRIPT_BENGALI,
+    HB_SCRIPT_GURMUKHI,
+    HB_SCRIPT_GUJARATI,
+    HB_SCRIPT_ORIYA,
+    HB_SCRIPT_TAMIL,
+    HB_SCRIPT_TELUGU,
+    HB_SCRIPT_KANNADA,
+    HB_SCRIPT_MALAYALAM,
+    HB_SCRIPT_SINHALA,
+    HB_SCRIPT_THAI,
+    HB_SCRIPT_LAO,
+    HB_SCRIPT_TIBETAN,
+    HB_SCRIPT_MYANMAR,
+    HB_SCRIPT_GEORGIAN,
+    HB_SCRIPT_HANGUL,
+    HB_SCRIPT_ETHIOPIC,
+    HB_SCRIPT_CHEROKEE,
+    HB_SCRIPT_CANADIAN_ABORIGINAL,
+    HB_SCRIPT_OGHAM,
+    HB_SCRIPT_RUNIC,
+    HB_SCRIPT_KHMER,
+    HB_SCRIPT_MONGOLIAN,
+    HB_SCRIPT_HIRAGANA,
+    HB_SCRIPT_KATAKANA,
+    HB_SCRIPT_BOPOMOFO,
+    HB_SCRIPT_HAN,
+    HB_SCRIPT_YI,
+    HB_SCRIPT_OLD_ITALIC,
+    HB_SCRIPT_GOTHIC,
+    HB_SCRIPT_DESERET,
+    HB_SCRIPT_INHERITED,
+    HB_SCRIPT_TAGALOG,
+    HB_SCRIPT_HANUNOO,
+    HB_SCRIPT_BUHID,
+    HB_SCRIPT_TAGBANWA,
+    HB_SCRIPT_LIMBU,
+    HB_SCRIPT_TAI_LE,
+    HB_SCRIPT_LINEAR_B,
+    HB_SCRIPT_UGARITIC,
+    HB_SCRIPT_SHAVIAN,
+    HB_SCRIPT_OSMANYA,
+    HB_SCRIPT_CYPRIOT,
+    HB_SCRIPT_BRAILLE,
+    HB_SCRIPT_BUGINESE,
+    HB_SCRIPT_COPTIC,
+    HB_SCRIPT_NEW_TAI_LUE,
+    HB_SCRIPT_GLAGOLITIC,
+    HB_SCRIPT_TIFINAGH,
+    HB_SCRIPT_SYLOTI_NAGRI,
+    HB_SCRIPT_OLD_PERSIAN,
+    HB_SCRIPT_KHAROSHTHI,
+    HB_SCRIPT_BALINESE,
+    HB_SCRIPT_CUNEIFORM,
+    HB_SCRIPT_PHOENICIAN,
+    HB_SCRIPT_PHAGS_PA,
+    HB_SCRIPT_NKO,
+    HB_SCRIPT_SUNDANESE,
+    HB_SCRIPT_LEPCHA,
+    HB_SCRIPT_OL_CHIKI,
+    HB_SCRIPT_VAI,
+    HB_SCRIPT_SAURASHTRA,
+    HB_SCRIPT_KAYAH_LI,
+    HB_SCRIPT_REJANG,
+    HB_SCRIPT_LYCIAN,
+    HB_SCRIPT_CARIAN,
+    HB_SCRIPT_LYDIAN,
+    HB_SCRIPT_CHAM,
+    HB_SCRIPT_TAI_THAM,
+    HB_SCRIPT_TAI_VIET,
+    HB_SCRIPT_AVESTAN,
+    HB_SCRIPT_EGYPTIAN_HIEROGLYPHS,
+    HB_SCRIPT_SAMARITAN,
+    HB_SCRIPT_LISU,
+    HB_SCRIPT_BAMUM,
+    HB_SCRIPT_JAVANESE,
+    HB_SCRIPT_MEETEI_MAYEK,
+    HB_SCRIPT_IMPERIAL_ARAMAIC,
+    HB_SCRIPT_OLD_SOUTH_ARABIAN,
+    HB_SCRIPT_INSCRIPTIONAL_PARTHIAN,
+    HB_SCRIPT_INSCRIPTIONAL_PAHLAVI,
+    HB_SCRIPT_OLD_TURKIC,
+    HB_SCRIPT_KAITHI,
+    HB_SCRIPT_BATAK,
+    HB_SCRIPT_BRAHMI,
+    HB_SCRIPT_MANDAIC,
+    HB_SCRIPT_CHAKMA,
+    HB_SCRIPT_MEROITIC_CURSIVE,
+    HB_SCRIPT_MEROITIC_HIEROGLYPHS,
+    HB_SCRIPT_MIAO,
+    HB_SCRIPT_SHARADA,
+    HB_SCRIPT_SORA_SOMPENG,
+    HB_SCRIPT_TAKRI,
+    HB_SCRIPT_UNKNOWN,
+};
+
+static unsigned int
+hb_ucdn_combining_class(hb_unicode_funcs_t *ufuncs, hb_codepoint_t unicode,
+        void *user_data)
+{
+    return ucdn_get_combining_class(unicode);
+}
+
+static unsigned int
+hb_ucdn_eastasian_width(hb_unicode_funcs_t *ufuncs, hb_codepoint_t unicode,
+        void *user_data)
+{
+    int w = ucdn_get_east_asian_width(unicode);
+    return (w == UCDN_EAST_ASIAN_F || w == UCDN_EAST_ASIAN_W) ? 2 : 1;
+}
+
+static hb_unicode_general_category_t
+hb_ucdn_general_category(hb_unicode_funcs_t *ufuncs,
+        hb_codepoint_t unicode, void *user_data)
+{
+    return (hb_unicode_general_category_t)ucdn_get_general_category(unicode);
+}
+
+static hb_codepoint_t
+hb_ucdn_mirror(hb_unicode_funcs_t *ufuncs, hb_codepoint_t unicode,
+        void *user_data)
+{
+    return ucdn_mirror(unicode);
+}
+
+static hb_script_t
+hb_ucdn_script(hb_unicode_funcs_t *ufuncs, hb_codepoint_t unicode,
+        void *user_data)
+{
+    return ucdn_script_translate[ucdn_get_script(unicode)];
+}
+
+static hb_bool_t
+hb_ucdn_compose(hb_unicode_funcs_t *ufuncs, hb_codepoint_t a,
+        hb_codepoint_t b, hb_codepoint_t *ab, void *user_data)
+{
+    return ucdn_compose(ab, a, b);
+}
+
+static hb_bool_t
+hb_ucdn_decompose(hb_unicode_funcs_t *ufuncs, hb_codepoint_t ab,
+        hb_codepoint_t *a, hb_codepoint_t *b, void *user_data)
+{
+    return ucdn_decompose(ab, a, b);
+}
+
+static unsigned int
+hb_ucdn_compat_decompose(hb_unicode_funcs_t *ufuncs, hb_codepoint_t u,
+        hb_codepoint_t *decomposed, void *user_data)
+{
+    return ucdn_compat_decompose(u, decomposed);
+}
+
+static hb_unicode_funcs_t *hb_ucdn_make_unicode_funcs(void)
+{
+    hb_unicode_funcs_t *funcs = hb_unicode_funcs_create(NULL);
+    hb_unicode_funcs_set_combining_class_func(funcs, hb_ucdn_combining_class, NULL, NULL);
+    hb_unicode_funcs_set_eastasian_width_func(funcs, hb_ucdn_eastasian_width, NULL, NULL);
+    hb_unicode_funcs_set_general_category_func(funcs, hb_ucdn_general_category, NULL, NULL);
+    hb_unicode_funcs_set_mirroring_func(funcs, hb_ucdn_mirror, NULL, NULL);
+    hb_unicode_funcs_set_script_func(funcs, hb_ucdn_script, NULL, NULL);
+    hb_unicode_funcs_set_compose_func(funcs, hb_ucdn_compose, NULL, NULL);
+    hb_unicode_funcs_set_decompose_func(funcs, hb_ucdn_decompose, NULL, NULL);
+    hb_unicode_funcs_set_decompose_compatibility_func(funcs, hb_ucdn_compat_decompose, NULL, NULL);
+    hb_unicode_funcs_make_immutable(funcs);
+
+    return funcs;
+}