From 377d1337a321ac41ab3ffe92d7c4eee6a5319581 Mon Sep 17 00:00:00 2001
From: Lucas Dupin <dupin@google.com>
Date: Thu, 5 Nov 2020 02:29:43 +0000
Subject: [PATCH] Support tinting blur drawable

In order to achieve the look and feel of colored surfaces, the blur
drawable should be able to receive a color and draw it on top of the
blur region.

Test: manual
Fixes: 172372852
Change-Id: I4cab21e337ca18f617780531368ba70154027b72
---
 .../graphics/drawable/BackgroundBlurDrawable.java      | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/core/java/com/android/internal/graphics/drawable/BackgroundBlurDrawable.java b/core/java/com/android/internal/graphics/drawable/BackgroundBlurDrawable.java
index 6ea9e665c009e..9eab6211dd438 100644
--- a/core/java/com/android/internal/graphics/drawable/BackgroundBlurDrawable.java
+++ b/core/java/com/android/internal/graphics/drawable/BackgroundBlurDrawable.java
@@ -20,6 +20,7 @@ import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.content.Context;
 import android.graphics.Canvas;
+import android.graphics.Color;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
 import android.graphics.Path;
@@ -75,7 +76,8 @@ public final class BackgroundBlurDrawable extends Drawable {
 
     private BackgroundBlurDrawable(Aggregator aggregator) {
         mAggregator = aggregator;
-        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
+        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
+        mPaint.setColor(Color.TRANSPARENT);
         mRenderNode = new RenderNode("BackgroundBlurDrawable");
         mRenderNode.addPositionUpdateListener(mPositionUpdateListener);
     }
@@ -85,10 +87,16 @@ public final class BackgroundBlurDrawable extends Drawable {
         if (mRectPath.isEmpty() || !isVisible() || getAlpha() == 0) {
             return;
         }
+
         canvas.drawPath(mRectPath, mPaint);
         canvas.drawRenderNode(mRenderNode);
     }
 
+    @Override
+    public void setTint(int tintColor) {
+        mPaint.setColor(tintColor);
+    }
+
     @Override
     public boolean setVisible(boolean visible, boolean restart) {
         boolean changed = super.setVisible(visible, restart);