Simplify TextureView draw path

bug:20461288

Change-Id: I239fbd26ab2177481c84feb62a1da68faeb634ac

1 files changed, 17 insertions, 11 deletions

diff --git a/core/java/android/view/TextureView.java b/core/java/android/view/TextureView.java
index cdc196e1c371..23bd3ac17954 100644
--- a/core/java/android/view/TextureView.java
+++ b/core/java/android/view/TextureView.java
@@ -302,11 +302,25 @@ public class TextureView extends View {
      */
     @Override
     public final void draw(Canvas canvas) {
-        // NOTE: Maintain this carefully (see View.java)
+        // NOTE: Maintain this carefully (see View#draw)
         mPrivateFlags = (mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN;
 
-        applyUpdate();
-        applyTransformMatrix();
+        /* Simplify drawing to guarantee the layer is the only thing drawn - so e.g. no background,
+        scrolling, or fading edges. This guarantees all drawing is in the layer, so drawing
+        properties (alpha, layer paint) affect all of the content of a TextureView. */
+
+        if (canvas.isHardwareAccelerated()) {
+            DisplayListCanvas displayListCanvas = (DisplayListCanvas) canvas;
+
+            HardwareLayer layer = getHardwareLayer();
+            if (layer != null) {
+                applyUpdate();
+                applyTransformMatrix();
+
+                mLayer.setLayerPaint(mLayerPaint); // ensure layer paint is up to date
+                displayListCanvas.drawHardwareLayer(layer);
+            }
+        }
     }
 
     /**
@@ -342,12 +356,7 @@ public class TextureView extends View {
         invalidate(true);
     }
 
-    @Override
     HardwareLayer getHardwareLayer() {
-        // NOTE: Maintain these two lines very carefully (see View.java)
-        mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
-        mPrivateFlags &= ~PFLAG_DIRTY_MASK;
-
         if (mLayer == null) {
             if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) {
                 return null;
@@ -385,9 +394,6 @@ public class TextureView extends View {
             mSurface.setDefaultBufferSize(getWidth(), getHeight());
         }
 
-        applyUpdate();
-        applyTransformMatrix();
-
         return mLayer;
     }