1 files changed, 10 insertions, 1 deletions
diff --git a/libs/hwui/renderthread/CanvasContext.h b/libs/hwui/renderthread/CanvasContext.h
index d4282fa..e20564b 100644
--- a/libs/hwui/renderthread/CanvasContext.h
+++ b/libs/hwui/renderthread/CanvasContext.h
@@ -48,6 +48,11 @@ namespace renderthread {
 
 class EglManager;
 
+enum SwapBehavior {
+    kSwap_default,
+    kSwap_discardBuffer,
+};
+
 // This per-renderer class manages the bridge between the global EGL context
 // and the render surface.
 // TODO: Rename to Renderer or some other per-window, top-level manager
@@ -57,6 +62,9 @@ public:
             IContextFactory* contextFactory);
     virtual ~CanvasContext();
 
+    // Won't take effect until next EGLSurface creation
+    void setSwapBehavior(SwapBehavior swapBehavior);
+
     bool initialize(ANativeWindow* window);
     void updateSurface(ANativeWindow* window);
     void pauseSurface(ANativeWindow* window);
@@ -111,7 +119,8 @@ private:
     EglManager& mEglManager;
     sp<ANativeWindow> mNativeWindow;
     EGLSurface mEglSurface;
-    bool mDirtyRegionsEnabled;
+    bool mBufferPreserved;
+    SwapBehavior mSwapBehavior;
 
     bool mOpaque;
     OpenGLRenderer* mCanvas;