Add support for advanced blend modes with the framebuffer.

This adds the ability to blend with the framebuffer using Darken,
Lighten, Add, Multiply, Overlay and Screen.

Change-Id: Iae01a53797d4ad39c373cba6ff2a42293129da1a

2 files changed, 121 insertions, 0 deletions

diff --git a/tests/HwAccelerationTest/AndroidManifest.xml b/tests/HwAccelerationTest/AndroidManifest.xml
index db1e5ef..ec1cbf1 100644
--- a/tests/HwAccelerationTest/AndroidManifest.xml
+++ b/tests/HwAccelerationTest/AndroidManifest.xml
@@ -230,6 +230,16 @@
         </activity>
 
         <activity
+                android:name="FramebufferBlendActivity"
+                android:label="_FramebufferBlend">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        
+
+        <activity
                 android:name="StackActivity"
                 android:label="_Stacks">
             <intent-filter>
diff --git a/tests/HwAccelerationTest/src/com/google/android/test/hwui/FramebufferBlendActivity.java b/tests/HwAccelerationTest/src/com/google/android/test/hwui/FramebufferBlendActivity.java
new file mode 100644
index 0000000..ef84b67
--- /dev/null
+++ b/tests/HwAccelerationTest/src/com/google/android/test/hwui/FramebufferBlendActivity.java
@@ -0,0 +1,111 @@
+/*
+ * 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.google.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.Color;
+import android.graphics.LinearGradient;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Shader;
+import android.os.Bundle;
+import android.view.View;
+
+@SuppressWarnings({"UnusedDeclaration"})
+public class FramebufferBlendActivity extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        setContentView(new BlendView(this));
+    }
+
+    static class BlendView extends View {
+        private int mTexWidth;
+        private int mTexHeight;
+        private Paint mPaint;
+        private LinearGradient mHorGradient;
+        private Bitmap mTexture;
+
+        BlendView(Context c) {
+            super(c);
+
+            mTexture = BitmapFactory.decodeResource(c.getResources(), R.drawable.sunset1);
+            mTexWidth = mTexture.getWidth();
+            mTexHeight = mTexture.getHeight();
+
+            mHorGradient = new LinearGradient(0.0f, 0.0f, mTexWidth, 0.0f,
+                    Color.BLACK, Color.WHITE, Shader.TileMode.CLAMP);
+
+            mPaint = new Paint();
+        }
+
+        @Override
+        protected void onDraw(Canvas canvas) {
+            super.onDraw(canvas);
+            canvas.drawRGB(255, 255, 255);
+
+            canvas.save();
+            canvas.translate(40.0f, 40.0f);
+
+            drawBlendedBitmap(canvas, PorterDuff.Mode.DARKEN);
+            drawBlendedBitmap(canvas, PorterDuff.Mode.LIGHTEN);
+            drawBlendedBitmap(canvas, PorterDuff.Mode.MULTIPLY);
+
+            canvas.restore();
+
+            canvas.save();
+            canvas.translate(40.0f + mTexWidth + 40.0f, 40.0f);
+
+            drawBlendedBitmap(canvas, PorterDuff.Mode.SCREEN);
+            drawBlendedBitmap(canvas, PorterDuff.Mode.ADD);
+            drawBlendedBitmapInverse(canvas, PorterDuff.Mode.OVERLAY);
+
+            canvas.restore();
+        }
+
+        private void drawBlendedBitmap(Canvas canvas, PorterDuff.Mode mode) {
+            mPaint.setShader(null);
+            mPaint.setXfermode(null);
+            canvas.drawBitmap(mTexture, 0.0f, 0.0f, mPaint);
+
+            mPaint.setShader(mHorGradient);
+            mPaint.setXfermode(new PorterDuffXfermode(mode));
+            canvas.drawRect(0.0f, 0.0f, mTexWidth, mTexHeight, mPaint);
+
+            canvas.translate(0.0f, 40.0f + mTexHeight);
+        }
+
+        private void drawBlendedBitmapInverse(Canvas canvas, PorterDuff.Mode mode) {
+            mPaint.setXfermode(null);
+            mPaint.setShader(mHorGradient);
+            canvas.drawRect(0.0f, 0.0f, mTexWidth, mTexHeight, mPaint);
+
+            mPaint.setXfermode(new PorterDuffXfermode(mode));
+            mPaint.setShader(null);
+            canvas.drawBitmap(mTexture, 0.0f, 0.0f, mPaint);
+
+            canvas.translate(0.0f, 40.0f + mTexHeight);
+        }
+    }
+}