Add API to turn on HW drawing in IMEs.

Change-Id: Ib6a8bda46223ce1153f32834daf02a820d16136e

1 files changed, 26 insertions, 0 deletions

diff --git a/core/java/android/inputmethodservice/InputMethodService.java b/core/java/android/inputmethodservice/InputMethodService.java
index c2cb1ff..a9de289 100644
--- a/core/java/android/inputmethodservice/InputMethodService.java
+++ b/core/java/android/inputmethodservice/InputMethodService.java
@@ -19,6 +19,7 @@ package android.inputmethodservice;
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
 
+import android.app.ActivityManager;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.res.Configuration;
@@ -38,6 +39,7 @@ import android.text.method.MovementMethod;
 import android.util.Log;
 import android.util.PrintWriterPrinter;
 import android.util.Printer;
+import android.view.Display;
 import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
@@ -250,6 +252,7 @@ public class InputMethodService extends AbstractInputMethodService {
     InputMethodManager mImm;
     
     int mTheme = 0;
+    boolean mHardwareAccelerated = false;
     
     LayoutInflater mInflater;
     TypedArray mThemeAttrs;
@@ -614,6 +617,26 @@ public class InputMethodService extends AbstractInputMethodService {
         mTheme = theme;
     }
 
+    /**
+     * You can call this to try to enable hardware accelerated drawing for
+     * your IME. This must be set before {@link #onCreate}, so you
+     * will typically call it in your constructor.  It is not always possible
+     * to use hardware acclerated drawing in an IME (for example on low-end
+     * devices that do not have the resources to support this), so the call
+     * returns true if it succeeds otherwise false if you will need to draw
+     * in software.  You must be able to handle either case.
+     */
+    public boolean enableHardwareAcceleration() {
+        if (mWindow != null) {
+            throw new IllegalStateException("Must be called before onCreate()");
+        }
+        if (ActivityManager.isHighEndGfx(new Display(Display.DEFAULT_DISPLAY, null))) {
+            mHardwareAccelerated = true;
+            return true;
+        }
+        return false;
+    }
+
     @Override public void onCreate() {
         mTheme = Resources.selectSystemTheme(mTheme,
                 getApplicationInfo().targetSdkVersion,
@@ -626,6 +649,9 @@ public class InputMethodService extends AbstractInputMethodService {
         mInflater = (LayoutInflater)getSystemService(
                 Context.LAYOUT_INFLATER_SERVICE);
         mWindow = new SoftInputWindow(this, mTheme, mDispatcherState);
+        if (mHardwareAccelerated) {
+            mWindow.getWindow().addFlags(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
+        }
         initViews();
         mWindow.getWindow().setLayout(MATCH_PARENT, WRAP_CONTENT);
     }