Chet Haase db8c9a6a4d Optimization of alpha with DisplayList properties
Some views (such as ImageView and TextView) handle non-opaque alpha
values directly. This was originally an optimization, but we can handle it faster
in many cases without this optimization when DisplayList properties are enabled.
Basically, if a view has non-overlapping rendering, we set the alpha value directly
on the renderer (the equivalent of setting it on the Paint object) and draw each
primitive with that alpha value. Doing it this way avoids re-creating DisplayLists
while getting the same speedup that onSetAlpha() used to get pre-DisplayList properties.

Change-Id: I0f7827f075d3b35093a882d4adbb300a1063c288
2012-04-03 14:02:17 -07:00

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XML

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2012 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
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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.
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/container">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Invalidate"
android:id="@+id/invalidateButton"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:id="@+id/button"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Some text"
android:id="@+id/textview"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/spantext"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Edit text"
android:id="@+id/edittext"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Selected text"
android:id="@+id/selectedtext"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Some text"
android:background="#00ff00"
android:id="@+id/textviewbackground"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/icon"
android:id="@+id/imageview"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="@+id/layout">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Some text"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Some text"
android:background="#00ff00"/>
</LinearLayout>
</LinearLayout>