From bdf7609867a3f886455c51dba91623a86cceb6e2 Mon Sep 17 00:00:00 2001
From: Romain Guy <romainguy@google.com>
Date: Mon, 18 Jul 2011 15:00:43 -0700
Subject: Trim OpenGLRenderer's memory usage whenever possible

Change-Id: I9225077184f374b1a43300add15cc1d5b6869d1c
---
 core/java/android/view/GLES20Canvas.java      | 32 +++++++++++++++++++++++++++
 core/java/android/view/HardwareRenderer.java  | 24 ++++++++++++++++++++
 core/java/android/view/WindowManagerImpl.java | 23 +++++++++++--------
 3 files changed, 70 insertions(+), 9 deletions(-)

(limited to 'core/java/android/view')

diff --git a/core/java/android/view/GLES20Canvas.java b/core/java/android/view/GLES20Canvas.java
index 4987e2f..80244bb 100644
--- a/core/java/android/view/GLES20Canvas.java
+++ b/core/java/android/view/GLES20Canvas.java
@@ -286,6 +286,38 @@ class GLES20Canvas extends HardwareCanvas {
 
     private static native boolean nCallDrawGLFunction(int renderer, int drawGLFunction);
 
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Memory
+    ///////////////////////////////////////////////////////////////////////////
+
+    /**
+     * @see #flushCaches(int) 
+     */
+    public static final int FLUSH_CACHES_MODERATE = 0;
+
+    /**
+     * @see #flushCaches(int) 
+     */
+    public static final int FLUSH_CACHES_FULL = 1;
+
+    /**
+     * Flush caches to reclaim as much memory as possible. The amount of memory
+     * to reclaim is indicate by the level parameter.
+     * 
+     * The level can be one of {@link #FLUSH_CACHES_MODERATE} or
+     * {@link #FLUSH_CACHES_FULL}.
+     * 
+     * @param level Hint about the amount of memory to reclaim
+     * 
+     * @hide
+     */
+    public static void flushCaches(int level) {
+        nFlushCaches(level);
+    }
+
+    private static native void nFlushCaches(int level);
+
     ///////////////////////////////////////////////////////////////////////////
     // Display list
     ///////////////////////////////////////////////////////////////////////////
diff --git a/core/java/android/view/HardwareRenderer.java b/core/java/android/view/HardwareRenderer.java
index 011e44c..9a2564f 100644
--- a/core/java/android/view/HardwareRenderer.java
+++ b/core/java/android/view/HardwareRenderer.java
@@ -17,6 +17,7 @@
 
 package android.view;
 
+import android.content.ComponentCallbacks;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.graphics.SurfaceTexture;
@@ -263,6 +264,18 @@ public abstract class HardwareRenderer {
     }
 
     /**
+     * Invoke this method when the system is running out of memory. This
+     * method will attempt to recover as much memory as possible, based on
+     * the specified hint.
+     * 
+     * @param level Hint about the amount of memory that should be trimmed,
+     *              see {@link android.content.ComponentCallbacks}
+     */
+    static void trimMemory(int level) {
+        Gl20Renderer.flushCaches(level);
+    }
+
+    /**
      * Indicates whether hardware acceleration is currently enabled.
      * 
      * @return True if hardware acceleration is in use, false otherwise.
@@ -858,5 +871,16 @@ public abstract class HardwareRenderer {
             }
             return null;
         }
+        
+        static void flushCaches(int level) {
+            switch (level) {
+                case ComponentCallbacks.TRIM_MEMORY_MODERATE:
+                    GLES20Canvas.flushCaches(GLES20Canvas.FLUSH_CACHES_MODERATE);
+                    break;
+                case ComponentCallbacks.TRIM_MEMORY_COMPLETE:
+                    GLES20Canvas.flushCaches(GLES20Canvas.FLUSH_CACHES_FULL);
+                    break;
+            }
+        }
     }
 }
diff --git a/core/java/android/view/WindowManagerImpl.java b/core/java/android/view/WindowManagerImpl.java
index 54e7c04..4e9531b 100644
--- a/core/java/android/view/WindowManagerImpl.java
+++ b/core/java/android/view/WindowManagerImpl.java
@@ -16,18 +16,16 @@
 
 package android.view;
 
-import java.util.HashMap;
-
 import android.content.res.CompatibilityInfo;
 import android.content.res.Configuration;
 import android.graphics.PixelFormat;
 import android.os.IBinder;
 import android.util.AndroidRuntimeException;
 import android.util.Log;
-import android.util.Slog;
-import android.view.WindowManager;
 import android.view.inputmethod.InputMethodManager;
 
+import java.util.HashMap;
+
 final class WindowLeaked extends AndroidRuntimeException {
     public WindowLeaked(String msg) {
         super(msg);
@@ -402,7 +400,16 @@ public class WindowManagerImpl implements WindowManager {
             }
         }
     }
-    
+
+    /**
+     * @param level See {@link android.content.ComponentCallbacks}
+     */
+    public void trimMemory(int level) {
+        if (HardwareRenderer.isAvailable()) {
+            HardwareRenderer.trimMemory(level);
+        }
+    }
+
     public void setStoppedState(IBinder token, boolean stopped) {
         synchronized (this) {
             if (mViews == null)
@@ -456,8 +463,7 @@ public class WindowManagerImpl implements WindowManager {
         return new Display(Display.DEFAULT_DISPLAY, null);
     }
 
-    private static void removeItem(Object[] dst, Object[] src, int index)
-    {
+    private static void removeItem(Object[] dst, Object[] src, int index) {
         if (dst.length > 0) {
             if (index > 0) {
                 System.arraycopy(src, 0, dst, 0, index);
@@ -468,8 +474,7 @@ public class WindowManagerImpl implements WindowManager {
         }
     }
 
-    private int findViewLocked(View view, boolean required)
-    {
+    private int findViewLocked(View view, boolean required) {
         synchronized (this) {
             final int count = mViews != null ? mViews.length : 0;
             for (int i=0; i<count; i++) {
-- 
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