Composite layers as regions.

This change detects what area of a layer was drawn into and generates a mesh
to match this area exactly. This can be used to avoid blending empty pixels
when the layer is composited.
This change also adds proper layers support to lines rendering and implements
layers composition in a more readable way.

Change-Id: I4a5588b98b19bd66891ebdc39631b193c5e31999

1 files changed, 3 insertions, 2 deletions

diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/LinesActivity.java b/tests/HwAccelerationTest/src/com/android/test/hwui/LinesActivity.java
index 91e3b84..8ca842e 100644
--- a/tests/HwAccelerationTest/src/com/android/test/hwui/LinesActivity.java
+++ b/tests/HwAccelerationTest/src/com/android/test/hwui/LinesActivity.java
@@ -23,6 +23,7 @@ import android.graphics.BitmapFactory;
 import android.graphics.BitmapShader;
 import android.graphics.Canvas;
 import android.graphics.Paint;
+import android.graphics.drawable.ColorDrawable;
 import android.os.Bundle;
 import android.view.View;
 
@@ -31,7 +32,9 @@ public class LinesActivity extends Activity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        getWindow().setBackgroundDrawable(new ColorDrawable(0xffffffff));
         final LinesView view = new LinesView(this);
+        //view.setAlpha(0.80f);
         setContentView(view);
     }
 
@@ -91,8 +94,6 @@ public class LinesActivity extends Activity {
         protected void onDraw(Canvas canvas) {
             super.onDraw(canvas);
 
-            canvas.drawARGB(255, 255, 255, 255);
-
             canvas.save();
             canvas.translate(100.0f, 20.0f);