1 files changed, 90 insertions, 0 deletions
diff --git a/android/WALT/app/src/main/java/org/chromium/latency/walt/FastPathSurfaceView.java b/android/WALT/app/src/main/java/org/chromium/latency/walt/FastPathSurfaceView.java
new file mode 100644
index 0000000..449627f
--- /dev/null
+++ b/android/WALT/app/src/main/java/org/chromium/latency/walt/FastPathSurfaceView.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.chromium.latency.walt;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.os.Build;
+import android.support.annotation.RequiresApi;
+import android.util.AttributeSet;
+import android.view.Surface;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.widget.Toast;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+class FastPathSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
+
+    private boolean isActive = false;
+
+    public FastPathSurfaceView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        getHolder().addCallback(this);
+        setZOrderOnTop(true);
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
+    @Override
+    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
+        Surface surface = holder.getSurface();
+        if (surface == null)
+            return;
+
+        try {
+            Method setSharedBufferMode = Surface.class.getMethod("setSharedBufferMode", boolean.class);
+            setSharedBufferMode.invoke(surface, true);
+            displayMessage("Using shared buffer mode.");
+        } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
+            displayMessage("Shared buffer mode is not supported.");
+        }
+        Canvas canvas = surface.lockCanvas(null);
+        canvas.drawColor(Color.GRAY);
+        surface.unlockCanvasAndPost(canvas);
+    }
+
+    @Override
+    public void surfaceCreated(SurfaceHolder holder) {
+        isActive = true;
+    }
+
+    @Override
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        isActive = false;
+    }
+
+    private void displayMessage(String message) {
+        Toast toast = Toast.makeText(getContext(), message, Toast.LENGTH_SHORT);
+        toast.show();
+    }
+
+    public void setRectColor(int color) {
+        Surface surface = getHolder().getSurface();
+        if (surface == null || !isActive)
+            return;
+        Rect rect = new Rect(10, 10, 310, 310);
+        Canvas canvas = surface.lockCanvas(rect);
+        Paint paint = new Paint();
+        paint.setColor(color);
+        canvas.drawRect(rect, paint);
+        surface.unlockCanvasAndPost(canvas);
+    }
+}