Preliminary support for clipRect(Rect, Op)

This adds basic support for clip regions. It is currently disabled at compile
time. Enabling clip regions will require setting up a stencil buffer.

Change-Id: I638616a972276e38737f8ac0633692c3845eaa74
diff --git a/tests/HwAccelerationTest/AndroidManifest.xml b/tests/HwAccelerationTest/AndroidManifest.xml
index 643cb8d..3904c21 100644
--- a/tests/HwAccelerationTest/AndroidManifest.xml
+++ b/tests/HwAccelerationTest/AndroidManifest.xml
@@ -40,6 +40,15 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <activity
+                android:name="ClipRegionActivity"
+                android:label="_ClipRegion">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
         
         <activity
                 android:name="DisplayListLayersActivity"
diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/ClipRegionActivity.java b/tests/HwAccelerationTest/src/com/android/test/hwui/ClipRegionActivity.java
new file mode 100644
index 0000000..b2a508b
--- /dev/null
+++ b/tests/HwAccelerationTest/src/com/android/test/hwui/ClipRegionActivity.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2010 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 com.android.test.hwui;
+
+import android.app.Activity;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Region;
+import android.os.Bundle;
+import android.view.View;
+
+@SuppressWarnings({"UnusedDeclaration"})
+public class ClipRegionActivity extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        final RegionView view = new RegionView(this);
+        setContentView(view);
+    }
+
+    public static class RegionView extends View {
+        public RegionView(Context c) {
+            super(c);
+        }
+
+        @Override
+        protected void onDraw(Canvas canvas) {
+            super.onDraw(canvas);
+
+            canvas.save();
+            canvas.clipRect(100.0f, 100.0f, getWidth() - 100.0f, getHeight() - 100.0f,
+                    Region.Op.DIFFERENCE);
+            canvas.drawARGB(255, 255, 0, 0);
+            canvas.restore();
+        }
+    }
+}