add a lib for rendering text in sdl2 and rules to make in makefile

SDL2_ttf/Android.mk

@@ -0,0 +1,63 @@
+# Save the local path
+SDL_TTF_LOCAL_PATH := $(call my-dir)
+
+# Enable this if you want to use HarfBuzz
+SUPPORT_HARFBUZZ ?= true
+HARFBUZZ_LIBRARY_PATH := external/harfbuzz
+
+FREETYPE_LIBRARY_PATH := external/freetype
+
+# Build freetype library
+ifneq ($(FREETYPE_LIBRARY_PATH),)
+    include $(SDL_TTF_LOCAL_PATH)/$(FREETYPE_LIBRARY_PATH)/Android.mk
+endif
+
+# Build the library
+ifeq ($(SUPPORT_HARFBUZZ),true)
+    include $(SDL_TTF_LOCAL_PATH)/$(HARFBUZZ_LIBRARY_PATH)/Android.mk
+endif
+
+# Restore local path
+LOCAL_PATH := $(SDL_TTF_LOCAL_PATH)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := SDL2_ttf
+
+LOCAL_C_INCLUDES := $(LOCAL_PATH)
+
+LOCAL_SRC_FILES := SDL_ttf.c.neon
+
+LOCAL_CFLAGS += -O2
+
+ifneq ($(FREETYPE_LIBRARY_PATH),)
+    LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(FREETYPE_LIBRARY_PATH)/include
+    LOCAL_STATIC_LIBRARIES += freetype
+endif
+
+ifeq ($(SUPPORT_HARFBUZZ),true)
+    LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(HARFBUZZ_LIBRARY_PATH)/src
+    LOCAL_CFLAGS += -DTTF_USE_HARFBUZZ
+    LOCAL_STATIC_LIBRARIES += harfbuzz
+endif
+
+LOCAL_SHARED_LIBRARIES := SDL2
+
+LOCAL_EXPORT_C_INCLUDES += $(LOCAL_C_INCLUDES)
+
+include $(BUILD_SHARED_LIBRARY)
+
+###########################
+#
+# SDL2_ttf static library
+#
+###########################
+
+LOCAL_MODULE := SDL2_ttf_static
+
+LOCAL_MODULE_FILENAME := libSDL2_ttf
+
+LOCAL_LDLIBS :=
+LOCAL_EXPORT_LDLIBS :=
+
+include $(BUILD_STATIC_LIBRARY)
+