android: Use system fonts as fallback instead of compiling binary blobs.

This drastically reduces the size of the android library.
Unfortunately it means font support is limited to what is available
on the device. We look for both the old DroidSans fonts and the more
recent Noto fonts.

1 files changed, 176 insertions, 0 deletions

diff --git a/platform/java/mupdf_native.c b/platform/java/mupdf_native.c
index 03f54995..4e541bde 100644
--- a/platform/java/mupdf_native.c
+++ b/platform/java/mupdf_native.c
@@ -588,6 +588,175 @@ static void lose_fids(JNIEnv *env)
 	(*env)->DeleteGlobalRef(env, cls_TryLaterException);
 }
 
+#ifdef HAVE_ANDROID
+
+static fz_font *load_noto(fz_context *ctx, const char *filename, int idx)
+{
+	fz_font *font;
+	fz_try(ctx)
+		font = fz_new_font_from_file(ctx, NULL, filename, idx, 0);
+	fz_catch(ctx)
+		return NULL;
+	return font;
+}
+
+static fz_font *load_noto_cjk(fz_context *ctx, int lang)
+{
+	fz_font *font = load_noto(ctx, "/system/fonts/NotoSansCJK-Regular.ttc", lang);
+	if (!font)
+		font = load_noto(ctx, "/system/fonts/DroidSansFallback.ttf", 0);
+	return font;
+}
+
+static fz_font *load_noto3(fz_context *ctx, const char *a, const char *b, const char *c)
+{
+	fz_font *font = load_noto(ctx, a, 0);
+	if (!font && b) font = load_noto(ctx, b, 0);
+	if (!font && c) font = load_noto(ctx, c, 0);
+	return font;
+}
+
+enum { JP, KR, SC, TC };
+
+#define NOTO3(NAME1, NAME2, NAME3) load_noto3(ctx, "/system/fonts/" NAME1 "-Regular.ttf", "/system/fonts/" NAME2 "-Regular.ttf", "/system/fonts/" NAME3 "-Regular.ttf")
+#define NOTO2(NAME1, NAME2) load_noto3(ctx, "/system/fonts/" NAME1 "-Regular.ttf", "/system/fonts/" NAME2 "-Regular.ttf", NULL)
+#define NOTO(NAME) load_noto3(ctx, "/system/fonts/" NAME "-Regular.ttf", NULL, NULL)
+
+fz_font *load_droid_fallback_font(fz_context *ctx, int script, int language, int serif, int bold, int italic)
+{
+	switch (script)
+	{
+	default:
+	case UCDN_SCRIPT_COMMON:
+	case UCDN_SCRIPT_INHERITED:
+	case UCDN_SCRIPT_UNKNOWN:
+		return NULL;
+
+	case UCDN_SCRIPT_HANGUL: return load_noto_cjk(ctx, KR);
+	case UCDN_SCRIPT_HIRAGANA: return load_noto_cjk(ctx, JP);
+	case UCDN_SCRIPT_KATAKANA: return load_noto_cjk(ctx, JP);
+	case UCDN_SCRIPT_BOPOMOFO: return load_noto_cjk(ctx, SC);
+	case UCDN_SCRIPT_HAN:
+		switch (language) {
+		case FZ_LANG_ja: return load_noto_cjk(ctx, JP);
+		case FZ_LANG_ko: return load_noto_cjk(ctx, KR);
+		case FZ_LANG_zh_Hant: return load_noto_cjk(ctx, TC);
+		default:
+		case FZ_LANG_zh_Hans: return load_noto_cjk(ctx, SC);
+		}
+
+	case UCDN_SCRIPT_LATIN: return NOTO2("NotoSans", "DroidSans");
+	case UCDN_SCRIPT_GREEK: return NOTO2("NotoSans", "DroidSans");
+	case UCDN_SCRIPT_CYRILLIC: return NOTO2("NotoSans", "DroidSans");
+	case UCDN_SCRIPT_ARABIC: return NOTO3("NotoNaskh", "NotoNaskhArabic", "DroidNaskh");
+
+	case UCDN_SCRIPT_ARMENIAN: return NOTO2("NotoSansArmenian", "DroidSansArmenian");
+	case UCDN_SCRIPT_BALINESE: return NOTO("NotoSansBalinese");
+	case UCDN_SCRIPT_BAMUM: return NOTO("NotoSansBamum");
+	case UCDN_SCRIPT_BATAK: return NOTO("NotoSansBatak");
+	case UCDN_SCRIPT_BENGALI: return NOTO("NotoSansBengali");
+	case UCDN_SCRIPT_CANADIAN_ABORIGINAL: return NOTO("NotoSansCanadianAboriginal");
+	case UCDN_SCRIPT_CHAM: return NOTO("NotoSansCham");
+	case UCDN_SCRIPT_CHEROKEE: return NOTO("NotoSansCherokee");
+	case UCDN_SCRIPT_DEVANAGARI: return NOTO2("NotoSansDevanagari", "DroidSansDevanagari");
+	case UCDN_SCRIPT_ETHIOPIC: return NOTO2("NotoSansEthiopic", "DroidSansEthiopic");
+	case UCDN_SCRIPT_GEORGIAN: return NOTO2("NotoSansGeorgian", "DroidSansGeorgian");
+	case UCDN_SCRIPT_GUJARATI: return NOTO("NotoSansGujarati");
+	case UCDN_SCRIPT_GURMUKHI: return NOTO("NotoSansGurmukhi");
+	case UCDN_SCRIPT_HEBREW: return NOTO2("NotoSansHebrew", "DroidSansHebrew");
+	case UCDN_SCRIPT_JAVANESE: return NOTO("NotoSansJavanese");
+	case UCDN_SCRIPT_KANNADA: return NOTO("NotoSansKannada");
+	case UCDN_SCRIPT_KAYAH_LI: return NOTO("NotoSansKayahLi");
+	case UCDN_SCRIPT_KHMER: return NOTO("NotoSansKhmer");
+	case UCDN_SCRIPT_LAO: return NOTO("NotoSansLao");
+	case UCDN_SCRIPT_LEPCHA: return NOTO("NotoSansLepcha");
+	case UCDN_SCRIPT_LIMBU: return NOTO("NotoSansLimbu");
+	case UCDN_SCRIPT_LISU: return NOTO("NotoSansLisu");
+	case UCDN_SCRIPT_MALAYALAM: return NOTO("NotoSansMalayalam");
+	case UCDN_SCRIPT_MANDAIC: return NOTO("NotoSansMandaic");
+	case UCDN_SCRIPT_MEETEI_MAYEK: return NOTO("NotoSansMeeteiMayek");
+	case UCDN_SCRIPT_MONGOLIAN: return NOTO("NotoSansMongolian");
+	case UCDN_SCRIPT_MYANMAR: return NOTO("NotoSansMyanmar");
+	case UCDN_SCRIPT_NEW_TAI_LUE: return NOTO("NotoSansNewTaiLue");
+	case UCDN_SCRIPT_NKO: return NOTO("NotoSansNKo");
+	case UCDN_SCRIPT_OL_CHIKI: return NOTO("NotoSansOlChiki");
+	case UCDN_SCRIPT_ORIYA: return NOTO("NotoSansOriya");
+	case UCDN_SCRIPT_SAURASHTRA: return NOTO("NotoSansSaurashtra");
+	case UCDN_SCRIPT_SINHALA: return NOTO("NotoSansSinhala");
+	case UCDN_SCRIPT_SUNDANESE: return NOTO("NotoSansSundanese");
+	case UCDN_SCRIPT_SYLOTI_NAGRI: return NOTO("NotoSansSylotiNagri");
+	case UCDN_SCRIPT_SYRIAC: return NOTO("NotoSansSyriacEastern");
+	case UCDN_SCRIPT_TAI_LE: return NOTO("NotoSansTaiLe");
+	case UCDN_SCRIPT_TAI_THAM: return NOTO("NotoSansTaiTham");
+	case UCDN_SCRIPT_TAI_VIET: return NOTO("NotoSansTaiViet");
+	case UCDN_SCRIPT_TAMIL: return NOTO2("NotoSansTamil", "DroidSansTamil");
+	case UCDN_SCRIPT_TELUGU: return NOTO("NotoSansTelugu");
+	case UCDN_SCRIPT_THAANA: return NOTO("NotoSansThaana");
+	case UCDN_SCRIPT_THAI: return NOTO2("NotoSansThai", "DroidSansThai");
+	case UCDN_SCRIPT_TIBETAN: return NOTO("NotoSansTibetan");
+	case UCDN_SCRIPT_TIFINAGH: return NOTO("NotoSansTifinagh");
+	case UCDN_SCRIPT_VAI: return NOTO("NotoSansVai");
+	case UCDN_SCRIPT_YI: return NOTO("NotoSansYi");
+
+	/* Historic */
+	case UCDN_SCRIPT_AVESTAN: return NOTO("NotoSansAvestan");
+	case UCDN_SCRIPT_BRAHMI: return NOTO("NotoSansBrahmi");
+	case UCDN_SCRIPT_BUGINESE: return NOTO("NotoSansBuginese");
+	case UCDN_SCRIPT_BUHID: return NOTO("NotoSansBuhid");
+	case UCDN_SCRIPT_CARIAN: return NOTO("NotoSansCarian");
+	case UCDN_SCRIPT_COPTIC: return NOTO("NotoSansCoptic");
+	case UCDN_SCRIPT_CUNEIFORM: return NOTO("NotoSansCuneiform");
+	case UCDN_SCRIPT_CYPRIOT: return NOTO("NotoSansCypriot");
+	case UCDN_SCRIPT_DESERET: return NOTO("NotoSansDeseret");
+	case UCDN_SCRIPT_EGYPTIAN_HIEROGLYPHS: return NOTO("NotoSansEgyptianHieroglyphs");
+	case UCDN_SCRIPT_GLAGOLITIC: return NOTO("NotoSansGlagolitic");
+	case UCDN_SCRIPT_GOTHIC: return NOTO("NotoSansGothic");
+	case UCDN_SCRIPT_HANUNOO: return NOTO("NotoSansHanunoo");
+	case UCDN_SCRIPT_IMPERIAL_ARAMAIC: return NOTO("NotoSansImperialAramaic");
+	case UCDN_SCRIPT_INSCRIPTIONAL_PAHLAVI: return NOTO("NotoSansInscriptionalPahlavi");
+	case UCDN_SCRIPT_INSCRIPTIONAL_PARTHIAN: return NOTO("NotoSansInscriptionalParthian");
+	case UCDN_SCRIPT_KAITHI: return NOTO("NotoSansKaithi");
+	case UCDN_SCRIPT_KHAROSHTHI: return NOTO("NotoSansKharoshthi");
+	case UCDN_SCRIPT_LINEAR_B: return NOTO("NotoSansLinearB");
+	case UCDN_SCRIPT_LYCIAN: return NOTO("NotoSansLycian");
+	case UCDN_SCRIPT_LYDIAN: return NOTO("NotoSansLydian");
+	case UCDN_SCRIPT_OGHAM: return NOTO("NotoSansOgham");
+	case UCDN_SCRIPT_OLD_ITALIC: return NOTO("NotoSansOldItalic");
+	case UCDN_SCRIPT_OLD_PERSIAN: return NOTO("NotoSansOldPersian");
+	case UCDN_SCRIPT_OLD_SOUTH_ARABIAN: return NOTO("NotoSansOldSouthArabian");
+	case UCDN_SCRIPT_OLD_TURKIC: return NOTO("NotoSansOldTurkic");
+	case UCDN_SCRIPT_OSMANYA: return NOTO("NotoSansOsmanya");
+	case UCDN_SCRIPT_PHAGS_PA: return NOTO("NotoSansPhagsPa");
+	case UCDN_SCRIPT_PHOENICIAN: return NOTO("NotoSansPhoenician");
+	case UCDN_SCRIPT_REJANG: return NOTO("NotoSansRejang");
+	case UCDN_SCRIPT_RUNIC: return NOTO("NotoSansRunic");
+	case UCDN_SCRIPT_SAMARITAN: return NOTO("NotoSansSamaritan");
+	case UCDN_SCRIPT_SHAVIAN: return NOTO("NotoSansShavian");
+	case UCDN_SCRIPT_TAGALOG: return NOTO("NotoSansTagalog");
+	case UCDN_SCRIPT_TAGBANWA: return NOTO("NotoSansTagbanwa");
+	case UCDN_SCRIPT_UGARITIC: return NOTO("NotoSansUgaritic");
+	}
+	return NULL;
+}
+
+fz_font *load_droid_cjk_font(fz_context *ctx, const char *name, int ros, int serif)
+{
+	switch (ros) {
+	case FZ_ADOBE_CNS_1: return load_noto_cjk(ctx, TC);
+	case FZ_ADOBE_GB_1: return load_noto_cjk(ctx, SC);
+	case FZ_ADOBE_JAPAN_1: return load_noto_cjk(ctx, JP);
+	case FZ_ADOBE_KOREA_1: return load_noto_cjk(ctx, KR);
+	}
+	return NULL;
+}
+
+fz_font *load_droid_font(fz_context *ctx, const char *name, int bold, int italic, int needs_exact_metrics)
+{
+	return NULL;
+}
+
+#endif
+
 /* Put the fz_context in thread-local storage */
 
 #ifdef _WIN32
@@ -675,6 +844,13 @@ static int init_base_context(JNIEnv *env)
 
 	fz_register_document_handlers(base_context);
 
+#ifdef HAVE_ANDROID
+	fz_install_load_system_font_funcs(base_context,
+		load_droid_font,
+		load_droid_cjk_font,
+		load_droid_fallback_font);
+#endif
+
 	return 0;
 }