Clean up setLayerType and setLayerPaint

bug:21755299
Change-Id: I8f0953ccfc3d743abdecc8ec228ed3e1b6718c3c

4 files changed, 20 insertions, 27 deletions

diff --git a/core/java/android/view/HardwareLayer.java b/core/java/android/view/HardwareLayer.java
index a12434c0835e..41c44f1b9b17 100644
--- a/core/java/android/view/HardwareLayer.java
+++ b/core/java/android/view/HardwareLayer.java
@@ -16,6 +16,7 @@
 
 package android.view;
 
+import android.annotation.Nullable;
 import android.graphics.Bitmap;
 import android.graphics.Matrix;
 import android.graphics.Paint;
@@ -51,8 +52,8 @@ final class HardwareLayer {
      * @param paint The paint used when the layer is drawn into the destination canvas.
      * @see View#setLayerPaint(android.graphics.Paint)
      */
-    public void setLayerPaint(Paint paint) {
-        nSetLayerPaint(mFinalizer.get(), paint.getNativeInstance());
+    public void setLayerPaint(@Nullable Paint paint) {
+        nSetLayerPaint(mFinalizer.get(), paint != null ? paint.getNativeInstance() : 0);
         mRenderer.pushLayerUpdate(this);
     }
 
diff --git a/core/java/android/view/RenderNode.java b/core/java/android/view/RenderNode.java
index a45c18d058cb..a19254f2a6f6 100644
--- a/core/java/android/view/RenderNode.java
+++ b/core/java/android/view/RenderNode.java
@@ -259,7 +259,7 @@ public class RenderNode {
         return nSetLayerType(mNativeRenderNode, layerType);
     }
 
-    public boolean setLayerPaint(Paint paint) {
+    public boolean setLayerPaint(@Nullable Paint paint) {
         return nSetLayerPaint(mNativeRenderNode, paint != null ? paint.getNativeInstance() : 0);
     }
 
diff --git a/core/java/android/view/TextureView.java b/core/java/android/view/TextureView.java
index 1be4810779da..1a712c3916db 100644
--- a/core/java/android/view/TextureView.java
+++ b/core/java/android/view/TextureView.java
@@ -16,6 +16,7 @@
 
 package android.view;
 
+import android.annotation.Nullable;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
@@ -133,7 +134,6 @@ public class TextureView extends View {
      */
     public TextureView(Context context) {
         super(context);
-        init();
     }
 
     /**
@@ -144,7 +144,6 @@ public class TextureView extends View {
      */
     public TextureView(Context context, AttributeSet attrs) {
         super(context, attrs);
-        init();
     }
 
     /**
@@ -158,7 +157,6 @@ public class TextureView extends View {
      */
     public TextureView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
-        init();
     }
 
     /**
@@ -176,11 +174,6 @@ public class TextureView extends View {
      */
     public TextureView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
         super(context, attrs, defStyleAttr, defStyleRes);
-        init();
-    }
-
-    private void init() {
-        mLayerPaint = new Paint();
     }
 
     /**
@@ -260,7 +253,7 @@ public class TextureView extends View {
      * method will however be taken into account when rendering the content of
      * this TextureView.
      *
-     * @param layerType The ype of layer to use with this view, must be one of
+     * @param layerType The type of layer to use with this view, must be one of
      *        {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
      *        {@link #LAYER_TYPE_HARDWARE}
      * @param paint The paint used to compose the layer. This argument is optional
@@ -268,16 +261,16 @@ public class TextureView extends View {
      *        {@link #LAYER_TYPE_NONE}
      */
     @Override
-    public void setLayerType(int layerType, Paint paint) {
-        if (paint != mLayerPaint) {
-            mLayerPaint = paint == null ? new Paint() : paint;
-            invalidate();
-        }
+    public void setLayerType(int layerType, @Nullable Paint paint) {
+        setLayerPaint(paint);
     }
 
     @Override
-    public void setLayerPaint(Paint paint) {
-        setLayerType(/* ignored */ 0, paint);
+    public void setLayerPaint(@Nullable Paint paint) {
+        if (paint != mLayerPaint) {
+            mLayerPaint = paint;
+            invalidate();
+        }
     }
 
     /**
diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index 6fa2aad2d65f..83c6e9e1ab83 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -11741,7 +11741,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
         }
     }
 
-   /**
+    /**
      * Utility method to retrieve the inverse of the current mMatrix property.
      * We cache the matrix to avoid recalculating it when transform properties
      * have not changed.
@@ -15626,7 +15626,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
      *
      * @attr ref android.R.styleable#View_layerType
      */
-    public void setLayerType(int layerType, Paint paint) {
+    public void setLayerType(int layerType, @Nullable Paint paint) {
         if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) {
             throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, "
                     + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE");
@@ -15645,8 +15645,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
         }
 
         mLayerType = layerType;
-        final boolean layerDisabled = (mLayerType == LAYER_TYPE_NONE);
-        mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint);
+        mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : paint;
         mRenderNode.setLayerPaint(mLayerPaint);
 
         // draw() behaves differently if we are on a layer, so we need to
@@ -15680,12 +15679,12 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
      *
      * @see #setLayerType(int, android.graphics.Paint)
      */
-    public void setLayerPaint(Paint paint) {
+    public void setLayerPaint(@Nullable Paint paint) {
         int layerType = getLayerType();
         if (layerType != LAYER_TYPE_NONE) {
-            mLayerPaint = paint == null ? new Paint() : paint;
+            mLayerPaint = paint;
             if (layerType == LAYER_TYPE_HARDWARE) {
-                if (mRenderNode.setLayerPaint(mLayerPaint)) {
+                if (mRenderNode.setLayerPaint(paint)) {
                     invalidateViewProperty(false, false);
                 }
             } else {
@@ -16855,7 +16854,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
                 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint);
             } else {
                 // use layer paint to draw the bitmap, merging the two alphas, but also restore
-                int layerPaintAlpha = mLayerPaint.getAlpha();
+                int layerPaintAlpha = mLayerPaint != null ? mLayerPaint.getAlpha() : 255;
                 mLayerPaint.setAlpha((int) (alpha * layerPaintAlpha));
                 canvas.drawBitmap(cache, 0.0f, 0.0f, mLayerPaint);
                 mLayerPaint.setAlpha(layerPaintAlpha);