From 43f7a3226afd3439b9e83c05606d14e3766381cc Mon Sep 17 00:00:00 2001
From: Ying Wang <wangying@google.com>
Date: Mon, 17 Nov 2014 16:56:04 -0800
Subject: [PATCH] Support prebuilt apk source selection based on
 PRODUCT_AAPT_PREF_CONFIG

Two new LOCAL variables are added to support dpi-specific prebuilt apk
selection:
- LOCAL_DPI_VARIANTS: specify a list of dpis the module provides with
  specific prebuilt.
  Example: LOCAL_DPI_VARIANTS := xxhdpi xhdpi hdpi mdpi
- LOCAL_DPI_FILE_STEM: specify the dpi-specific source file name
  pattern.
  Example: LOCAL_DPI_FILE_STEM := MyApp-%.apk
  "%" will be substitued by $(PRODUCT_AAPT_PREF_CONFIG) in the core
  build system.
  If you don't set up LOCAL_DPI_FILE_STEM, the default is
  $(LOCAL_MODULE)_%.apk.

The build system searches $(PRODUCT_AAPT_PREF_CONFIG) in a prebuilt apk
module's $(LOCAL_DPI_VARIANTS). If not found, use whatever
$(LOCAL_SRC_FILES) as the source file; Otherwise use $(LOCAL_DPI_FILE_STEM)
to construct the dpi-specific apk's source file name, and use whatever
directory name of $(LOCAL_SRC_FILES).

Bug: 18388705
Change-Id: I63cae73f1b6f880302142abc476b3ce1fb5500b5
---
 core/clear_vars.mk        |  2 ++
 core/prebuilt_internal.mk | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 92b3fc45f..361988067 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -158,6 +158,8 @@ LOCAL_MODULE_TARGET_ARCH_WARN:=
 LOCAL_MODULE_UNSUPPORTED_TARGET_ARCH:=
 LOCAL_MODULE_UNSUPPORTED_TARGET_ARCH_WARN:=
 LOCAL_MODULE_HOST_ARCH:=
+LOCAL_DPI_VARIANTS:=
+LOCAL_DPI_FILE_STEM:=
 
 # arch specific variables
 LOCAL_SRC_FILES_$(TARGET_ARCH):=
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index 284884cda..5c02f8d3b 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -114,6 +114,19 @@ endif  # LOCAL_STRIP_MODULE not true
 ifeq ($(LOCAL_MODULE_CLASS),APPS)
 PACKAGES.$(LOCAL_MODULE).OVERRIDES := $(strip $(LOCAL_OVERRIDES_PACKAGES))
 
+# Select dpi-specific source
+ifdef LOCAL_DPI_VARIANTS
+my_dpi := $(filter $(LOCAL_DPI_VARIANTS),$(PRODUCT_AAPT_PREF_CONFIG))
+ifdef my_dpi
+ifdef LOCAL_DPI_FILE_STEM
+my_prebuilt_dpi_file_stem := $(LOCAL_DPI_FILE_STEM)
+else
+my_prebuilt_dpi_file_stem := $(LOCAL_MODULE)_%.apk
+endif
+my_prebuilt_src_file := $(dir $(my_prebuilt_src_file))$(subst %,$(my_dpi),$(my_prebuilt_dpi_file_stem))
+endif  # my_dpi
+endif  # LOCAL_DPI_VARIANTS
+
 rs_compatibility_jni_libs :=
 include $(BUILD_SYSTEM)/install_jni_libs.mk