Preliminary Support for region clipping

Region clipping, using Canvas.clipPath or Canvas.clipRegion, requires
a stencil buffer to be always present. In addition, extra wiring is
required in JNI and display lists.

This change only adds the necessary JNI/C++ APIs and some extra
plumbing to start the real work on properly supporting region
clipping.

A new debug define called DEBUG_CLIP_REGIONS can be used to draw
the current clip region. It is off by default, as is region
clipping.

The default implementation of clipPath() and clipRegion(), now
in native, mimics the previous Dalvik implementation to prevent
regressions.

Change-Id: I7903e7cfd7412b9b9b622566d4dbfce7bdcec00c

1 files changed, 3 insertions, 7 deletions

diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/ClipRegionActivity.java b/tests/HwAccelerationTest/src/com/android/test/hwui/ClipRegionActivity.java
index b2a508b..d5daa5f 100644
--- a/tests/HwAccelerationTest/src/com/android/test/hwui/ClipRegionActivity.java
+++ b/tests/HwAccelerationTest/src/com/android/test/hwui/ClipRegionActivity.java
@@ -18,13 +18,7 @@ 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;
@@ -50,8 +44,10 @@ public class ClipRegionActivity extends Activity {
             canvas.save();
             canvas.clipRect(100.0f, 100.0f, getWidth() - 100.0f, getHeight() - 100.0f,
                     Region.Op.DIFFERENCE);
-            canvas.drawARGB(255, 255, 0, 0);
+            canvas.drawARGB(128, 255, 0, 0);
             canvas.restore();
+
+            invalidate();
         }
     }
 }