Updating the hotseat background to a solid color with rounded corners

Change-Id: I297920518f925e122f2e9f55a68228b96b42ea27

src/com/android/launcher3/graphics/NinePatchDrawHelper.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.launcher3.graphics;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.graphics.RectF;
+
+/**
+ * Utility class which draws a bitmap by dissecting it into 3 segments and stretching
+ * the middle segment.
+ */
+public class NinePatchDrawHelper {
+
+    // The extra width used for the bitmap. This portion of the bitmap is stretched to match the
+    // width of the draw region. Randomly chosen, any value > 4 will be sufficient.
+    public static final int EXTENSION_PX = 20;
+
+    private final Rect mSrc = new Rect();
+    private final RectF mDst = new RectF();
+    public final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
+
+    public void draw(Bitmap bitmap, Canvas canvas, float left, float top, float right) {
+        int width = bitmap.getWidth();
+        int height = bitmap.getHeight();
+
+        mSrc.top = 0;
+        mSrc.bottom = height;
+
+        mDst.top = top;
+        mDst.bottom = top + height;
+
+        int halfWidth = width / 2;
+
+        // Draw left edge
+        drawRegion(bitmap, canvas, 0, halfWidth, left, left + halfWidth);
+
+        // Draw right edge
+        drawRegion(bitmap, canvas, halfWidth, width, right - halfWidth, right);
+
+        // Draw middle stretched region
+        int halfExt = EXTENSION_PX / 4;
+        drawRegion(bitmap, canvas, halfWidth - halfExt, halfWidth + halfExt,
+                left + halfWidth, right - halfWidth);
+    }
+
+    private void drawRegion(Bitmap bitmap, Canvas c,
+            int srcLeft, int srcRight, float dstLeft, float dstRight) {
+        mSrc.left = srcLeft;
+        mSrc.right = srcRight;
+
+        mDst.left = dstLeft;
+        mDst.right = dstRight;
+        c.drawBitmap(bitmap, mSrc, mDst, paint);
+    }
+}