From 2c5d63439e653c2981841ca819957fbd8a414d54 Mon Sep 17 00:00:00 2001
From: Derek Sollenberger <djsollen@google.com>
Date: Thu, 9 Apr 2020 09:44:54 -0400
Subject: [PATCH] Create a version_script to explicitly define exported symbols
 for libhwui

The linker script defines both the C and C++ headers exported by libhwui
and libskia (included via whole_static_libs).  Reducing the surface
area makes it clear what libhwui's external dependencies are as well
as reducing the binary size by about ~12% (1.04 MB on 64-bit and 789KB
on 32-bit builds for the Pixel 3a in userdebug).

Test: compiles and links
Bug: 150782769
Change-Id: Ia202a12c1605c851c52d953f0db0f4814ade8dfd
---
 libs/hwui/Android.bp      |  5 +++
 libs/hwui/libhwui.map.txt | 70 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 libs/hwui/libhwui.map.txt

diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index 5c08325a94a00..769afc58f50df 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -603,6 +603,11 @@ cc_library {
         "android_graphics_jni",
     ],
     export_header_lib_headers: ["android_graphics_apex_headers"],
+    target: {
+        android: {
+            version_script: "libhwui.map.txt",
+        }
+    },
 }
 
 cc_library_static {
diff --git a/libs/hwui/libhwui.map.txt b/libs/hwui/libhwui.map.txt
new file mode 100644
index 0000000000000..73de0d12a60b0
--- /dev/null
+++ b/libs/hwui/libhwui.map.txt
@@ -0,0 +1,70 @@
+LIBHWUI {
+  global:
+    /* listing of all C APIs to be exposed by libhwui to consumers outside of the module */
+    ABitmap_getInfoFromJava;
+    ABitmap_acquireBitmapFromJava;
+    ABitmap_copy;
+    ABitmap_acquireRef;
+    ABitmap_releaseRef;
+    ABitmap_getInfo;
+    ABitmap_getDataSpace;
+    ABitmap_getPixels;
+    ABitmap_notifyPixelsChanged;
+    ABitmapConfig_getFormatFromConfig;
+    ABitmapConfig_getConfigFromFormat;
+    ABitmap_compress;
+    ABitmap_getHardwareBuffer;
+    ACanvas_isSupportedPixelFormat;
+    ACanvas_getNativeHandleFromJava;
+    ACanvas_createCanvas;
+    ACanvas_destroyCanvas;
+    ACanvas_setBuffer;
+    ACanvas_clipRect;
+    ACanvas_clipOutRect;
+    ACanvas_drawRect;
+    ACanvas_drawBitmap;
+    init_android_graphics;
+    register_android_graphics_classes;
+    register_android_graphics_GraphicsStatsService;
+    zygote_preload_graphics;
+    AMatrix_getContents;
+    APaint_createPaint;
+    APaint_destroyPaint;
+    APaint_setBlendMode;
+    ARegionIterator_acquireIterator;
+    ARegionIterator_releaseIterator;
+    ARegionIterator_isComplex;
+    ARegionIterator_isDone;
+    ARegionIterator_next;
+    ARegionIterator_getRect;
+    ARegionIterator_getTotalBounds;
+    ARenderThread_dumpGraphicsMemory;
+  local:
+    *;
+};
+
+LIBHWUI_PLATFORM {
+  global:
+    extern "C++" {
+      /* required by libwebviewchromium_plat_support */
+      android::uirenderer::ColorSpaceToADataSpace*;
+      android::uirenderer::WebViewFunctor_*;
+      GraphicsJNI::getNativeCanvas*;
+      SkCanvasStateUtils::ReleaseCanvasState*;
+      SkColorSpace::toXYZD50*;
+      SkColorSpace::transferFn*;
+      /* required by libjnigraphics */
+      android::ImageDecoder::*;
+      android::uirenderer::DataSpaceToColorSpace*;
+      android::uirenderer::ColorSpaceToADataSpace*;
+      getMimeType*;
+      SkAndroidCodec::*;
+      SkCodec::MakeFromStream*;
+      SkColorInfo::*;
+      SkFILEStream::SkFILEStream*;
+      SkImageInfo::*;
+      SkMemoryStream::SkMemoryStream*;
+    };
+  local:
+    *;
+};