Add an on-screen overdraw counter

The counter can be enabled by setting the system property called
debug.hwui.overdraw to the string "count". If the string is set
to "show", overdraw will be highlighted on screen instead of
printing out a simple counter.

Change-Id: I9a9c970d54bffab43138bbb7682f6c04bc2c40bd

1 files changed, 10 insertions, 2 deletions

diff --git a/core/java/android/view/HardwareLayer.java b/core/java/android/view/HardwareLayer.java
index 18b838b37aa7..23383d9c0473 100644
--- a/core/java/android/view/HardwareLayer.java
+++ b/core/java/android/view/HardwareLayer.java
@@ -158,14 +158,22 @@ abstract class HardwareLayer {
     /**
      * This must be invoked before drawing onto this layer.
      *
-     * @param currentCanvas
+     * @param currentCanvas The canvas whose rendering needs to be interrupted
      */
     abstract HardwareCanvas start(Canvas currentCanvas);
 
     /**
+     * This must be invoked before drawing onto this layer.
+     *
+     * @param dirty The dirty area to repaint
+     * @param currentCanvas The canvas whose rendering needs to be interrupted
+     */
+    abstract HardwareCanvas start(Canvas currentCanvas, Rect dirty);
+
+    /**
      * This must be invoked after drawing onto this layer.
      *
-     * @param currentCanvas
+     * @param currentCanvas The canvas whose rendering needs to be resumed
      */
     abstract void end(Canvas currentCanvas);