Dedupe updates to the home handle tint

- The dark intensity & home handle was updating but due to the
  interpolator used and the long duration of the animation, the
  rounded rgb/alpha values didn't actually change between every
  animation frame.

Bug: 143565744
Test: Trigger nav bar handle tint change, ensure no unnecessary updates
Change-Id: I44a403f381b4216d07cecb74097e52c4abc85465

packages/SystemUI/src/com/android/systemui/CornerHandleView.java

@@ -47,6 +47,7 @@ public class CornerHandleView extends View {
     private int mLightColor;
     private int mDarkColor;
     private Path mPath;
+    private boolean mRequiresInvalidate;
 
     public CornerHandleView(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -67,6 +68,15 @@ public class CornerHandleView extends View {
         updatePath();
     }
 
+    @Override
+    public void setAlpha(float alpha) {
+        super.setAlpha(alpha);
+        if (alpha > 0f && mRequiresInvalidate) {
+            mRequiresInvalidate = false;
+            invalidate();
+        }
+    }
+
     private void updatePath() {
         mPath = new Path();
 
@@ -104,11 +114,16 @@ public class CornerHandleView extends View {
      * appropriately. Intention is to match the home handle color.
      */
     public void updateDarkness(float darkIntensity) {
-        mPaint.setColor((int) ArgbEvaluator.getInstance().evaluate(darkIntensity,
-                mLightColor,
-                mDarkColor));
-        if (getVisibility() == VISIBLE) {
-            invalidate();
+        int color = (int) ArgbEvaluator.getInstance().evaluate(darkIntensity,
+                mLightColor, mDarkColor);
+        if (mPaint.getColor() != color) {
+            mPaint.setColor(color);
+            if (getVisibility() == VISIBLE && getAlpha() > 0) {
+                invalidate();
+            } else {
+                // If we are currently invisible, then invalidate when we are next made visible
+                mRequiresInvalidate = true;
+            }
         }
     }
 

packages/SystemUI/src/com/android/systemui/assist/ui/EdgeLight.java

@@ -67,8 +67,10 @@ public final class EdgeLight {
     }
 
     /** Sets the edge light color. */
-    public void setColor(@ColorInt int color) {
+    public boolean setColor(@ColorInt int color) {
+        boolean changed = mColor != color;
         mColor = color;
+        return changed;
     }
 
     /** Returns the edge light length, in units of the total device perimeter. */

packages/SystemUI/src/com/android/systemui/assist/ui/InvocationLightsView.java

@@ -259,10 +259,13 @@ public class InvocationLightsView extends View
         if (mUseNavBarColor) {
             @ColorInt int invocationColor = (int) ArgbEvaluator.getInstance().evaluate(
                     darkIntensity, mLightColor, mDarkColor);
+            boolean changed = true;
             for (EdgeLight light : mAssistInvocationLights) {
-                light.setColor(invocationColor);
+                changed &= light.setColor(invocationColor);
+            }
+            if (changed) {
+                invalidate();
             }
-            invalidate();
         }
     }
 

packages/SystemUI/src/com/android/systemui/statusbar/phone/ButtonDispatcher.java

@@ -203,10 +203,16 @@ public class ButtonDispatcher {
             mFadeAnimator.addUpdateListener(mAlphaListener);
             mFadeAnimator.start();
         } else {
-            mAlpha = alpha;
-            final int N = mViews.size();
-            for (int i = 0; i < N; i++) {
-                mViews.get(i).setAlpha(alpha);
+            // Discretize the alpha updates to prevent too frequent updates when there is a long
+            // alpha animation
+            int prevAlpha = (int) (getAlpha() * 255);
+            int nextAlpha = (int) (alpha * 255);
+            if (prevAlpha != nextAlpha) {
+                mAlpha = nextAlpha / 255f;
+                final int N = mViews.size();
+                for (int i = 0; i < N; i++) {
+                    mViews.get(i).setAlpha(mAlpha);
+                }
             }
         }
     }

packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationHandle.java

@@ -31,13 +31,13 @@ import com.android.settingslib.Utils;
 import com.android.systemui.R;
 
 public class NavigationHandle extends View implements ButtonInterface {
-    private float mDarkIntensity = -1;
 
     private final Paint mPaint = new Paint();
     private @ColorInt final int mLightColor;
     private @ColorInt final int mDarkColor;
     private final int mRadius;
     private final int mBottom;
+    private boolean mRequiresInvalidate;
 
     public NavigationHandle(Context context) {
         this(context, null);
@@ -59,6 +59,15 @@ public class NavigationHandle extends View implements ButtonInterface {
         setFocusable(false);
     }
 
+    @Override
+    public void setAlpha(float alpha) {
+        super.setAlpha(alpha);
+        if (alpha > 0f && mRequiresInvalidate) {
+            mRequiresInvalidate = false;
+            invalidate();
+        }
+    }
+
     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);
@@ -85,11 +94,15 @@ public class NavigationHandle extends View implements ButtonInterface {
 
     @Override
     public void setDarkIntensity(float intensity) {
-        if (mDarkIntensity != intensity) {
-            mPaint.setColor((int) ArgbEvaluator.getInstance().evaluate(intensity, mLightColor,
-                    mDarkColor));
-            mDarkIntensity = intensity;
-            invalidate();
+        int color = (int) ArgbEvaluator.getInstance().evaluate(intensity, mLightColor, mDarkColor);
+        if (mPaint.getColor() != color) {
+            mPaint.setColor(color);
+            if (getVisibility() == VISIBLE && getAlpha() > 0) {
+                invalidate();
+            } else {
+                // If we are currently invisible, then invalidate when we are next made visible
+                mRequiresInvalidate = true;
+            }
         }
     }