Make symlinks for DroidSans.ttf and DroidSans-Bold.ttf

Bug: 5420351

Make the following symlinks:
/system/fonts/DroidSans.ttf -> Roboto-Regular.ttf
/system/fonts/DroidSans-Bold.ttf -> Roboto-Bold.ttf

Change-Id: If9a74ef4ac2386cdb46d125fed8ce5771e872310

Author: Ying Wang

CleanSpec.mk

@@ -115,6 +115,7 @@ $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/fonts/Lohit_Hindi.ttf)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/media/audio/)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/fonts/DroidSans*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/media/audio/)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/fonts/DroidSans*)
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************

data/fonts/Android.mk

@@ -17,45 +17,67 @@
 
 LOCAL_PATH := $(call my-dir)
 
-ifeq ($(SMALLER_FONT_FOOTPRINT),true)
-droidsans_fallback_src := DroidSansFallback.ttf
-extra_droidsans_fonts :=
-else
-droidsans_fallback_src := DroidSansFallbackFull.ttf
-extra_droidsans_fonts := DroidSans.ttf DroidSans-Bold.ttf DroidSansEthiopic-Regular.ttf
-endif
+##########################################
+# We may only afford small font footprint.
+##########################################
+# Use only symlinks.
+# Symlink: DroidSans.ttf -> Roboto-Regular.ttf
+LOCAL_MODULE := DroidSans.ttf
+font_symlink_src := $(PRODUCT_OUT)/system/fonts/Roboto-Regular.ttf
+font_symlink := $(dir $(font_symlink_src))$(LOCAL_MODULE)
+$(font_symlink) : $(font_symlink_src)
+	@echo "Symlink: $@ -> $<"
+	@mkdir -p $(dir $@)
+	@rm -rf $@
+	$(hide) ln -sf $(notdir $<) $@
 
-include $(CLEAR_VARS)
-LOCAL_MODULE := DroidSansFallback.ttf
-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)
-droidsans_fallback_src :=
-extra_droidsans_fonts :=
-include $(BUILD_PREBUILT)
+# this magic makes LOCAL_REQUIRED_MODULES work
+ALL_MODULES.$(LOCAL_MODULE).INSTALLED := \
+    $(ALL_MODULES.$(LOCAL_MODULE).INSTALLED) $(font_symlink)
 
-include $(CLEAR_VARS)
-LOCAL_MODULE := DroidSans.ttf
-LOCAL_SRC_FILES := $(LOCAL_MODULE)
-LOCAL_MODULE_CLASS := ETC
-LOCAL_MODULE_TAGS := optional
-LOCAL_MODULE_PATH := $(TARGET_OUT)/fonts
-include $(BUILD_PREBUILT)
+################################
+# Symlink: DroidSans-Bold.ttf -> Roboto-Bold.ttf
+LOCAL_MODULE := DroidSans-Bold.ttf
+font_symlink_src := $(PRODUCT_OUT)/system/fonts/Roboto-Bold.ttf
+font_symlink := $(dir $(font_symlink_src))$(LOCAL_MODULE)
+$(font_symlink) : $(font_symlink_src)
+	@echo "Symlink: $@ -> $<"
+	@mkdir -p $(dir $@)
+	@rm -rf $@
+	$(hide) ln -sf $(notdir $<) $@
+
+# this magic makes LOCAL_REQUIRED_MODULES work
+ALL_MODULES.$(LOCAL_MODULE).INSTALLED := \
+    $(ALL_MODULES.$(LOCAL_MODULE).INSTALLED) $(font_symlink)
 
+################################
 include $(CLEAR_VARS)
-LOCAL_MODULE := DroidSans-Bold.ttf
+LOCAL_MODULE := DroidSansEthiopic-Regular.ttf
 LOCAL_SRC_FILES := $(LOCAL_MODULE)
 LOCAL_MODULE_CLASS := ETC
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE_PATH := $(TARGET_OUT)/fonts
 include $(BUILD_PREBUILT)
 
+################################
+ifeq ($(SMALLER_FONT_FOOTPRINT),true)
+droidsans_fallback_src := DroidSansFallback.ttf
+extra_droidsans_fonts := DroidSans.ttf DroidSans-Bold.ttf
+else
+droidsans_fallback_src := DroidSansFallbackFull.ttf
+extra_droidsans_fonts := DroidSans.ttf DroidSans-Bold.ttf DroidSansEthiopic-Regular.ttf
+endif  # SMALLER_FONT_FOOTPRINT
+
 include $(CLEAR_VARS)
-LOCAL_MODULE := DroidSansEthiopic-Regular.ttf
-LOCAL_SRC_FILES := $(LOCAL_MODULE)
+LOCAL_MODULE := DroidSansFallback.ttf
+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)
 include $(BUILD_PREBUILT)
+
+font_symlink_src :=
+font_symlink :=
+droidsans_fallback_src :=
+extra_droidsans_fonts :=