Fix 3201849: Enable hardware acceleration in LockScreen WaveView [DO NOT MERGE]

Change-Id: I07bbed7843857158cd2c1ffd9b184bde7fd5860d

2 files changed, 22 insertions, 5 deletions

diff --git a/core/java/android/view/ViewRoot.java b/core/java/android/view/ViewRoot.java
index 11908bb..a53c6d0 100644
--- a/core/java/android/view/ViewRoot.java
+++ b/core/java/android/view/ViewRoot.java
@@ -498,15 +498,21 @@ public final class ViewRoot extends Handler implements ViewParent,
         mAttachInfo.mHardwareAccelerationRequested = false;
 
         // Try to enable hardware acceleration if requested
-        if (attrs != null &&
-                (attrs.flags & WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED) != 0) {
+        final boolean hardwareAccelerated = 
+                (attrs.flags & WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED) != 0;
+
+        if (attrs != null && hardwareAccelerated) {
             // Only enable hardware acceleration if we are not in the system process
             // The window manager creates ViewRoots to display animated preview windows
             // of launching apps and we don't want those to be hardware accelerated
-            if (!HardwareRenderer.sRendererDisabled) {
+
+            final boolean systemHwAccelerated =
+                (attrs.flags & WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED_SYSTEM) != 0;
+
+            if (!HardwareRenderer.sRendererDisabled || systemHwAccelerated) {
                 // Don't enable hardware acceleration when we're not on the main thread
-                if (Looper.getMainLooper() != Looper.myLooper()) {
-                    Log.w(HardwareRenderer.LOG_TAG, "Attempting to initialize hardware " 
+                if (!systemHwAccelerated && Looper.getMainLooper() != Looper.myLooper()) {
+                    Log.w(HardwareRenderer.LOG_TAG, "Attempting to initialize hardware "
                             + "acceleration outside of the main thread, aborting");
                     return;
                 }
diff --git a/core/java/android/view/WindowManager.java b/core/java/android/view/WindowManager.java
index ca932e9..8a18aaf 100644
--- a/core/java/android/view/WindowManager.java
+++ b/core/java/android/view/WindowManager.java
@@ -665,6 +665,17 @@ public interface WindowManager extends ViewManager {
          * XML attribute is set to true on an activity or on the application.</p>
          */
         public static final int FLAG_HARDWARE_ACCELERATED = 0x01000000;
+        
+        /**
+         * Like {@link #FLAG_HARDWARE_ACCELERATED} except for trusted system windows
+         * that need hardware acceleration (e.g. LockScreen), where hardware acceleration
+         * is generally disabled. This flag must be specified in addition to 
+         * {@link #FLAG_HARDWARE_ACCELERATED} to enable hardware acceleration for system
+         * windows.
+         * 
+         * @hide
+         */
+        public static final int FLAG_HARDWARE_ACCELERATED_SYSTEM = 0x02000000;
 
         // ----- HIDDEN FLAGS.
         // These start at the high bit and go down.