Add Japanese to fallback fonts

On devices with adequate space, add MTLmr3m.ttf (Japanese) to the set
of fallback fonts. By default, DroidSansFallback (Chinese) is given
priority over MTLmr3m. If the locale is changed to Japanese, the
priority is reversed.

Bug: 6272763
Change-Id: I785a927d6dff0206aa9a670c51fdad76e219fc97

4 files changed, 128 insertions, 6 deletions

diff --git a/data/fonts/Android.mk b/data/fonts/Android.mk
index ef38a60..5ba6bf9 100644
--- a/data/fonts/Android.mk
+++ b/data/fonts/Android.mk
@@ -54,7 +54,7 @@ ALL_MODULES.$(LOCAL_MODULE).INSTALLED := \
 # On space-constrained devices, we include a subset of fonts:
 ifeq ($(SMALLER_FONT_FOOTPRINT),true)
 droidsans_fallback_src := DroidSansFallback.ttf
-extra_droidsans_fonts := DroidSans.ttf DroidSans-Bold.ttf
+extra_font_files := DroidSans.ttf DroidSans-Bold.ttf
 else
 include $(CLEAR_VARS)
 LOCAL_MODULE := DroidSansEthiopic-Regular.ttf
@@ -64,8 +64,29 @@ LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE_PATH := $(TARGET_OUT)/fonts
 include $(BUILD_PREBUILT)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE := MTLmr3m.ttf
+LOCAL_SRC_FILES := $(LOCAL_MODULE)
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_PATH := $(TARGET_OUT)/fonts
+include $(BUILD_PREBUILT)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := fallback_fonts-ja.xml
+LOCAL_SRC_FILES := $(LOCAL_MODULE)
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)
+include $(BUILD_PREBUILT)
+
 droidsans_fallback_src := DroidSansFallbackFull.ttf
-extra_droidsans_fonts := DroidSans.ttf DroidSans-Bold.ttf DroidSansEthiopic-Regular.ttf
+extra_font_files := \
+	DroidSans.ttf \
+	DroidSans-Bold.ttf \
+	DroidSansEthiopic-Regular.ttf \
+	MTLmr3m.ttf \
+	fallback_fonts-ja.xml
 endif  # SMALLER_FONT_FOOTPRINT
 
 ################################
@@ -75,13 +96,13 @@ LOCAL_SRC_FILES := $(droidsans_fallback_src)
 LOCAL_MODULE_CLASS := ETC
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE_PATH := $(TARGET_OUT)/fonts
-LOCAL_REQUIRED_MODULES := $(extra_droidsans_fonts)
+LOCAL_REQUIRED_MODULES := $(extra_font_files)
 include $(BUILD_PREBUILT)
 
 font_symlink_src :=
 font_symlink :=
 droidsans_fallback_src :=
-extra_droidsans_fonts :=
+extra_font_files :=
 
 ################################
 # Build the rest font files as prebuilt.
diff --git a/data/fonts/fallback_fonts-ja.xml b/data/fonts/fallback_fonts-ja.xml
new file mode 100644
index 0000000..62491d8
--- /dev/null
+++ b/data/fonts/fallback_fonts-ja.xml
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Fallback Fonts
+
+    This file specifies the fonts, and the priority order, that will be searched for any
+    glyphs not handled by the default fonts specified in /system/etc/system_fonts.xml.
+    Each entry consists of a family tag and a list of files (file names) which support that
+    family. The fonts for each family are listed in the order of the styles that they
+    handle (the order is: regular, bold, italic, and bold-italic). The order in which the
+    families are listed in this file represents the order in which these fallback fonts
+    will be searched for glyphs that are not supported by the default system fonts (which are
+    found in /system/etc/system_fonts.xml).
+
+    Note that there is not nameset for fallback fonts, unlike the fonts specified in
+    system_fonts.xml. The ability to support specific names in fallback fonts may be supported
+    in the future. For now, the lack of files entries here is an indicator to the system that
+    these are fallback fonts, instead of default named system fonts.
+
+    There is another optional file in /vendor/etc/fallback_fonts.xml. That file can be used to
+    provide references to other font families that should be used in addition to the default
+    fallback fonts. That file can also specify the order in which the fallback fonts should be
+    searched, to ensure that a vendor-provided font will be used before another fallback font
+    which happens to handle the same glyph.
+
+    Han languages (Chinese, Japanese, and Korean) share a common range of unicode characters;
+    their ordering in the fallback or vendor files gives priority to the first in the list.
+    Locale-specific ordering can be configured by adding language and region codes to the end
+    of the filename (e.g. /system/etc/fallback_fonts-ja.xml). When no region code is used,
+    as with this example, all regions are matched. Use separate files for each supported locale.
+    The standard fallback file (fallback_fonts.xml) is used when a locale does not have its own
+    file. All fallback files must contain the same complete set of fonts; only their ordering
+    can differ.
+-->
+<familyset>
+    <family>
+        <fileset>
+            <file>DroidSansArabic.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansEthiopic-Regular.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansHebrew-Regular.ttf</file>
+            <file>DroidSansHebrew-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansThai.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansArmenian.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansGeorgian.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>Lohit-Devanagari.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>Lohit-Bengali.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>Lohit-Tamil.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>AndroidEmoji.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>MTLmr3m.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansFallback.ttf</file>
+        </fileset>
+    </family>
+</familyset>
diff --git a/data/fonts/fallback_fonts.xml b/data/fonts/fallback_fonts.xml
index 63b3a58..ba01947 100644
--- a/data/fonts/fallback_fonts.xml
+++ b/data/fonts/fallback_fonts.xml
@@ -88,4 +88,9 @@
             <file>DroidSansFallback.ttf</file>
         </fileset>
     </family>
+    <family>
+        <fileset>
+            <file>MTLmr3m.ttf</file>
+        </fileset>
+    </family>
 </familyset>
diff --git a/data/fonts/fonts.mk b/data/fonts/fonts.mk
index 458f85b..db26765 100644
--- a/data/fonts/fonts.mk
+++ b/data/fonts/fonts.mk
@@ -15,8 +15,8 @@
 # Warning: this is actually a product definition, to be inherited from
 
 PRODUCT_COPY_FILES := \
-    frameworks/base/data/fonts/system_fonts.xml:system/etc/system_fonts.xml \
-    frameworks/base/data/fonts/fallback_fonts.xml:system/etc/fallback_fonts.xml
+    frameworks/base/data/fonts/system_fonts.xml:$(TARGET_COPY_OUT_SYSTEM)/etc/system_fonts.xml \
+    frameworks/base/data/fonts/fallback_fonts.xml:$(TARGET_COPY_OUT_SYSTEM)/etc/fallback_fonts.xml
 
 PRODUCT_PACKAGES := \
     DroidSansFallback.ttf \