Merging ScrimView into GradientView

Less banding, less drawing for All Apps Transition.

Bug: 63873246

Change-Id: I6c7c856e2939a10db7e44b266c1d6d51334fd152

14 files changed, 84 insertions, 207 deletions

diff --git a/res/drawable-hdpi/all_apps_alpha_mask.png b/res/drawable-hdpi/all_apps_alpha_mask.png
deleted file mode 100755
index 01e9e56f7..000000000
--- a/res/drawable-hdpi/all_apps_alpha_mask.png
+++ /dev/null
diff --git a/res/drawable-mdpi/all_apps_alpha_mask.png b/res/drawable-mdpi/all_apps_alpha_mask.png
deleted file mode 100755
index f24e71d41..000000000
--- a/res/drawable-mdpi/all_apps_alpha_mask.png
+++ /dev/null
diff --git a/res/drawable-xhdpi/all_apps_alpha_mask.png b/res/drawable-xhdpi/all_apps_alpha_mask.png
deleted file mode 100755
index f47943349..000000000
--- a/res/drawable-xhdpi/all_apps_alpha_mask.png
+++ /dev/null
diff --git a/res/drawable-xxhdpi/all_apps_alpha_mask.png b/res/drawable-xxhdpi/all_apps_alpha_mask.png
deleted file mode 100755
index d5facd78c..000000000
--- a/res/drawable-xxhdpi/all_apps_alpha_mask.png
+++ /dev/null
diff --git a/res/drawable-xxxhdpi/all_apps_alpha_mask.png b/res/drawable-xxxhdpi/all_apps_alpha_mask.png
deleted file mode 100755
index ed53ff924..000000000
--- a/res/drawable-xxxhdpi/all_apps_alpha_mask.png
+++ /dev/null
diff --git a/res/layout-land/launcher.xml b/res/layout-land/launcher.xml
index fd66593cf..dab074391 100644
--- a/res/layout-land/launcher.xml
+++ b/res/layout-land/launcher.xml
@@ -42,7 +42,12 @@
             android:layout_gravity="center"
             launcher:pageIndicator="@id/page_indicator" />
 
-        <include layout="@layout/gradient_scrim" />
+        <com.android.launcher3.graphics.GradientView
+            android:id="@+id/gradient_bg"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:visibility="gone"
+            launcher:layout_ignoreInsets="true"/>
 
         <!-- DO NOT CHANGE THE ID -->
         <include layout="@layout/hotseat"
diff --git a/res/layout-port/launcher.xml b/res/layout-port/launcher.xml
index 93c90780b..bace51aac 100644
--- a/res/layout-port/launcher.xml
+++ b/res/layout-port/launcher.xml
@@ -44,7 +44,12 @@
             launcher:pageIndicator="@+id/page_indicator">
         </com.android.launcher3.Workspace>
 
-        <include layout="@layout/gradient_scrim" />
+        <com.android.launcher3.graphics.GradientView
+            android:id="@+id/gradient_bg"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:visibility="gone"
+            launcher:layout_ignoreInsets="true"/>
 
         <!-- DO NOT CHANGE THE ID -->
         <include layout="@layout/hotseat"
diff --git a/res/layout-sw720dp/launcher.xml b/res/layout-sw720dp/launcher.xml
index ca4d846f1..18d235c1d 100644
--- a/res/layout-sw720dp/launcher.xml
+++ b/res/layout-sw720dp/launcher.xml
@@ -43,7 +43,12 @@
             launcher:pageIndicator="@id/page_indicator">
         </com.android.launcher3.Workspace>
 
-        <include layout="@layout/gradient_scrim" />
+        <com.android.launcher3.graphics.GradientView
+            android:id="@+id/gradient_bg"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:visibility="gone"
+            launcher:layout_ignoreInsets="true"/>
 
         <!-- DO NOT CHANGE THE ID -->
         <include layout="@layout/hotseat"
diff --git a/res/layout/gradient_scrim.xml b/res/layout/gradient_scrim.xml
deleted file mode 100644
index c40c5fc0c..000000000
--- a/res/layout/gradient_scrim.xml
+++ /dev/null
@@ -1,31 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- 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.
--->
-<merge xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-    <com.android.launcher3.graphics.GradientView
-        android:id="@+id/gradient_bg"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:visibility="gone"
-        app:layout_ignoreInsets="true"/>
-
-    <com.android.launcher3.graphics.ScrimView
-        android:id="@+id/scrim_bg"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:visibility="gone"
-        app:layout_ignoreInsets="true"/>
-</merge>
\ No newline at end of file
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index 9100fe28d..3aa2db000 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -28,7 +28,6 @@ import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.ResolveInfo;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
-import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Matrix;
 import android.graphics.Paint;
@@ -654,27 +653,4 @@ public final class Utilities {
         return hashSet;
     }
 
-    /**
-     * @return creates a new alpha mask bitmap out of an existing bitmap
-     */
-    public static Bitmap convertToAlphaMask(Bitmap b, int applyAlpha) {
-        Bitmap a = Bitmap.createBitmap(b.getWidth(), b.getHeight(), Bitmap.Config.ALPHA_8);
-        Canvas c = new Canvas(a);
-        Paint paint = new Paint();
-        paint.setAlpha(applyAlpha);
-        c.drawBitmap(b, 0f, 0f, paint);
-        return a;
-    }
-
-    /**
-     * @return a new white 1x1 bitmap with ALPHA_8
-     */
-    public static Bitmap createOnePixBitmap() {
-        Bitmap a = Bitmap.createBitmap(1, 1, Bitmap.Config.ALPHA_8);
-        Canvas c = new Canvas(a);
-        Paint paint = new Paint();
-        paint.setColor(Color.WHITE);
-        c.drawPaint(paint);
-        return a;
-    }
 }
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index a6194cc20..6896b37d9 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -25,7 +25,6 @@ import com.android.launcher3.Workspace;
 import com.android.launcher3.anim.SpringAnimationHandler;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.graphics.GradientView;
-import com.android.launcher3.graphics.ScrimView;
 import com.android.launcher3.touch.SwipeDetector;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action;
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
@@ -101,7 +100,6 @@ public class AllAppsTransitionController implements TouchController, SwipeDetect
     private boolean mIsTranslateWithoutWorkspace = false;
     private AnimatorSet mDiscoBounceAnimation;
     private GradientView mGradientView;
-    private ScrimView mScrimView;
 
     private SpringAnimationHandler mSpringAnimationHandler;
 
@@ -302,13 +300,6 @@ public class AllAppsTransitionController implements TouchController, SwipeDetect
             mGradientView.setVisibility(View.VISIBLE);
         }
         mGradientView.setProgress(progress);
-
-        // scrim
-        if (mScrimView == null) {
-            mScrimView = (ScrimView) mLauncher.findViewById(R.id.scrim_bg);
-            mScrimView.setVisibility(View.VISIBLE);
-        }
-        mScrimView.setProgress(progress);
     }
 
     /**
diff --git a/src/com/android/launcher3/graphics/GradientView.java b/src/com/android/launcher3/graphics/GradientView.java
index 9dd950454..678396df1 100644
--- a/src/com/android/launcher3/graphics/GradientView.java
+++ b/src/com/android/launcher3/graphics/GradientView.java
@@ -18,13 +18,14 @@ package com.android.launcher3.graphics;
 
 import android.content.Context;
 import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Color;
+import android.graphics.LinearGradient;
 import android.graphics.Paint;
 import android.graphics.RadialGradient;
 import android.graphics.RectF;
 import android.graphics.Shader;
+import android.support.v4.graphics.ColorUtils;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.animation.AccelerateInterpolator;
@@ -34,6 +35,7 @@ import com.android.launcher3.Launcher;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.dynamicui.WallpaperColorInfo;
+import com.android.launcher3.util.Themes;
 
 /**
  * Draws a translucent radial gradient background from an initial state with progress 0.0 to a
@@ -42,44 +44,44 @@ import com.android.launcher3.dynamicui.WallpaperColorInfo;
 public class GradientView extends View implements WallpaperColorInfo.OnChangeListener {
 
     private static final int DEFAULT_COLOR = Color.WHITE;
-    private static final float GRADIENT_ALPHA_MASK_LENGTH_DP = 300;
+    private static final int ALPHA_MASK_HEIGHT_DP = 500;
+    private static final int ALPHA_MASK_WIDTH_DP = 2;
+    private static final int ALPHA_COLORS = 0xBF;
     private static final boolean DEBUG = false;
 
-    private final Bitmap mFinalGradientMask;
     private final Bitmap mAlphaGradientMask;
 
+    private boolean mShowScrim = true;
     private int mColor1 = DEFAULT_COLOR;
     private int mColor2 = DEFAULT_COLOR;
     private int mWidth;
     private int mHeight;
     private final RectF mAlphaMaskRect = new RectF();
     private final RectF mFinalMaskRect = new RectF();
-    private final Paint mPaint = new Paint();
+    private final Paint mPaintWithScrim = new Paint();
+    private final Paint mPaintNoScrim = new Paint();
     private float mProgress;
-    private final int mMaskHeight;
+    private final int mMaskHeight, mMaskWidth;
     private final Context mAppContext;
     private final Paint mDebugPaint = DEBUG ? new Paint() : null;
     private final Interpolator mAccelerator = new AccelerateInterpolator();
     private final float mAlphaStart;
     private final WallpaperColorInfo mWallpaperColorInfo;
+    private final int mScrimColor;
 
     public GradientView(Context context, AttributeSet attrs) {
         super(context, attrs);
         this.mAppContext = context.getApplicationContext();
-        this.mMaskHeight = Utilities.pxFromDp(GRADIENT_ALPHA_MASK_LENGTH_DP,
+        this.mMaskHeight = Utilities.pxFromDp(ALPHA_MASK_HEIGHT_DP,
+                mAppContext.getResources().getDisplayMetrics());
+        this.mMaskWidth = Utilities.pxFromDp(ALPHA_MASK_WIDTH_DP,
                 mAppContext.getResources().getDisplayMetrics());
         Launcher launcher = Launcher.getLauncher(context);
         this.mAlphaStart = launcher.getDeviceProfile().isVerticalBarLayout() ? 0 : 100;
+        this.mScrimColor = Themes.getAttrColor(context, R.attr.allAppsScrimColor);
         this.mWallpaperColorInfo = WallpaperColorInfo.getInstance(launcher);
         updateColors();
-
-        int finalAlpha = 0xBF;
-        mFinalGradientMask = Utilities.convertToAlphaMask(
-                Utilities.createOnePixBitmap(), finalAlpha);
-        Bitmap alphaMaskFromResource = BitmapFactory.decodeResource(context.getResources(),
-                R.drawable.all_apps_alpha_mask);
-        mAlphaGradientMask = Utilities.convertToAlphaMask(
-                alphaMaskFromResource, finalAlpha);
+        mAlphaGradientMask = createDitheredAlphaMask();
     }
 
     @Override
@@ -101,8 +103,10 @@ public class GradientView extends View implements WallpaperColorInfo.OnChangeLis
     }
 
     private void updateColors() {
-        this.mColor1 = mWallpaperColorInfo.getMainColor();
-        this.mColor2 = mWallpaperColorInfo.getSecondaryColor();
+        this.mColor1 = ColorUtils.setAlphaComponent(mWallpaperColorInfo.getMainColor(),
+                ALPHA_COLORS);
+        this.mColor2 = ColorUtils.setAlphaComponent(mWallpaperColorInfo.getSecondaryColor(),
+                ALPHA_COLORS);
         if (mWidth + mHeight > 0) {
             createRadialShader();
         }
@@ -122,34 +126,53 @@ public class GradientView extends View implements WallpaperColorInfo.OnChangeLis
     private void createRadialShader() {
         final float gradientCenterY = 1.05f;
         float radius = Math.max(mHeight, mWidth) * gradientCenterY;
-
         float posScreenBottom = (radius - mHeight) / radius; // center lives below screen
-        RadialGradient shader = new RadialGradient(
+
+        RadialGradient shaderNoScrim = new RadialGradient(
                 mWidth * 0.5f,
                 mHeight * gradientCenterY,
                 radius,
                 new int[] {mColor1, mColor1, mColor2},
                 new float[] {0f, posScreenBottom, 1f},
                 Shader.TileMode.CLAMP);
-        mPaint.setShader(shader);
+        mPaintNoScrim.setShader(shaderNoScrim);
+
+        int color1 = ColorUtils.compositeColors(mScrimColor,mColor1);
+        int color2 = ColorUtils.compositeColors(mScrimColor,mColor2);
+        RadialGradient shaderWithScrim = new RadialGradient(
+                mWidth * 0.5f,
+                mHeight * gradientCenterY,
+                radius,
+                new int[] { color1, color1, color2 },
+                new float[] {0f, posScreenBottom, 1f},
+                Shader.TileMode.CLAMP);
+        mPaintWithScrim.setShader(shaderWithScrim);
     }
 
     public void setProgress(float progress) {
+        setProgress(progress, true);
+    }
+
+    public void setProgress(float progress, boolean showScrim) {
         this.mProgress = progress;
+        this.mShowScrim = showScrim;
         invalidate();
     }
 
     @Override
     protected void onDraw(Canvas canvas) {
+        Paint paint = mShowScrim ? mPaintWithScrim : mPaintNoScrim;
+
         float head = 0.29f;
         float linearProgress = head + (mProgress * (1f - head));
         float startMaskY = (1f - linearProgress) * mHeight - mMaskHeight * linearProgress;
         float interpolatedAlpha = (255 - mAlphaStart) * mAccelerator.getInterpolation(mProgress);
-        mPaint.setAlpha((int) (mAlphaStart + interpolatedAlpha));
-        mAlphaMaskRect.set(0, startMaskY, mWidth, startMaskY + mMaskHeight);
-        mFinalMaskRect.set(0, startMaskY + mMaskHeight, mWidth, mHeight);
-        canvas.drawBitmap(mAlphaGradientMask, null, mAlphaMaskRect, mPaint);
-        canvas.drawBitmap(mFinalGradientMask, null, mFinalMaskRect, mPaint);
+        paint.setAlpha((int) (mAlphaStart + interpolatedAlpha));
+        float div = (float) Math.floor(startMaskY + mMaskHeight);
+        mAlphaMaskRect.set(0, startMaskY, mWidth, div);
+        mFinalMaskRect.set(0, div, mWidth, mHeight);
+        canvas.drawBitmap(mAlphaGradientMask, null, mAlphaMaskRect, paint);
+        canvas.drawRect(mFinalMaskRect, paint);
 
         if (DEBUG) {
             mDebugPaint.setColor(0xFF00FF00);
@@ -157,4 +180,20 @@ public class GradientView extends View implements WallpaperColorInfo.OnChangeLis
             canvas.drawLine(0, startMaskY + mMaskHeight, mWidth, startMaskY + mMaskHeight, mDebugPaint);
         }
     }
+
+    public Bitmap createDitheredAlphaMask() {
+        Bitmap dst = Bitmap.createBitmap(mMaskWidth, mMaskHeight, Bitmap.Config.ALPHA_8);
+        Canvas c = new Canvas(dst);
+        Paint paint = new Paint(Paint.DITHER_FLAG);
+        LinearGradient lg = new LinearGradient(0, 0, 0, mMaskHeight,
+                new int[]{
+                        0x00FFFFFF,
+                        ColorUtils.setAlphaComponent(Color.WHITE, (int) (0xFF * 0.95)),
+                        0xFFFFFFFF},
+                new float[]{0f, 0.8f, 1f},
+                Shader.TileMode.CLAMP);
+        paint.setShader(lg);
+        c.drawRect(0, 0, mMaskWidth, mMaskHeight, paint);
+        return dst;
+    }
 }
\ No newline at end of file
diff --git a/src/com/android/launcher3/graphics/ScrimView.java b/src/com/android/launcher3/graphics/ScrimView.java
deleted file mode 100644
index 6d1f30a41..000000000
--- a/src/com/android/launcher3/graphics/ScrimView.java
+++ /dev/null
@@ -1,115 +0,0 @@
-/*
- * 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.content.Context;
-import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.graphics.RectF;
-import android.support.v4.graphics.ColorUtils;
-import android.util.AttributeSet;
-import android.view.View;
-import android.view.animation.AccelerateInterpolator;
-import android.view.animation.Interpolator;
-
-import com.android.launcher3.Launcher;
-import com.android.launcher3.R;
-import com.android.launcher3.Utilities;
-import com.android.launcher3.util.Themes;
-
-public class ScrimView extends View {
-
-    private static final boolean DEBUG = false;
-
-    private static final int MASK_HEIGHT_DP = 300;
-    private static final float MASK_START_LENGTH_FACTOR = 1f;
-    private static final boolean APPLY_ALPHA = true;
-
-    private final Bitmap mFinalScrimMask;
-    private final Bitmap mAlphaScrimMask;
-
-    private final int mMaskHeight;
-    private int mVisibleHeight;
-    private final int mHeadStart;
-
-    private final RectF mAlphaMaskRect = new RectF();
-    private final RectF mFinalMaskRect = new RectF();
-    private final Paint mPaint = new Paint();
-    private float mProgress;
-    private final Interpolator mAccelerator = new AccelerateInterpolator();
-    private final Paint mDebugPaint = DEBUG ? new Paint() : null;
-    private final int mAlphaStart;
-
-    public ScrimView(Context context, AttributeSet attrs) {
-        super(context, attrs);
-        mMaskHeight = Utilities.pxFromDp(MASK_HEIGHT_DP, getResources().getDisplayMetrics());
-        mHeadStart = (int) (mMaskHeight * MASK_START_LENGTH_FACTOR);
-        mAlphaStart = Launcher.getLauncher(context)
-                .getDeviceProfile().isVerticalBarLayout() ? 0 : 55;
-
-        int scrimColor = Themes.getAttrColor(context, R.attr.allAppsScrimColor);
-        int scrimAlpha = Color.alpha(scrimColor);
-        mPaint.setColor(scrimColor);
-        mFinalScrimMask = Utilities.convertToAlphaMask(
-                Utilities.createOnePixBitmap(), scrimAlpha);
-        Bitmap alphaMaskFromResource = BitmapFactory.decodeResource(getResources(),
-                R.drawable.all_apps_alpha_mask);
-        mAlphaScrimMask = Utilities.convertToAlphaMask(alphaMaskFromResource, scrimAlpha);
-    }
-
-    @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-        int width = MeasureSpec.getSize(widthMeasureSpec);
-        mVisibleHeight = MeasureSpec.getSize(heightMeasureSpec);
-        setMeasuredDimension(width, mVisibleHeight * 2);
-        setProgress(mProgress);
-    }
-
-    public void setProgress(float progress) {
-        mProgress = progress;
-        float initialY = mVisibleHeight - mHeadStart;
-        float fullTranslationY = mVisibleHeight;
-        float linTranslationY = initialY - progress * fullTranslationY;
-        setTranslationY(linTranslationY);
-
-        if (APPLY_ALPHA) {
-            int alpha = mAlphaStart + (int) ((255f - mAlphaStart)
-                    * mAccelerator.getInterpolation(progress));
-            mPaint.setAlpha(alpha);
-            invalidate();
-        }
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        mAlphaMaskRect.set(0, 0, getWidth(), mMaskHeight);
-        mFinalMaskRect.set(0, mMaskHeight, getWidth(), getHeight());
-        canvas.drawBitmap(mAlphaScrimMask, null, mAlphaMaskRect, mPaint);
-        canvas.drawBitmap(mFinalScrimMask, null, mFinalMaskRect, mPaint);
-
-        if (DEBUG) {
-            mDebugPaint.setColor(0xFF0000FF);
-            canvas.drawLine(0, mAlphaMaskRect.top, getWidth(), mAlphaMaskRect.top, mDebugPaint);
-            canvas.drawLine(0, mAlphaMaskRect.bottom, getWidth(), mAlphaMaskRect.bottom, mDebugPaint);
-        }
-    }
-
-}
diff --git a/src/com/android/launcher3/widget/WidgetsBottomSheet.java b/src/com/android/launcher3/widget/WidgetsBottomSheet.java
index 2f9f3485c..0b4bf628e 100644
--- a/src/com/android/launcher3/widget/WidgetsBottomSheet.java
+++ b/src/com/android/launcher3/widget/WidgetsBottomSheet.java
@@ -275,7 +275,9 @@ public class WidgetsBottomSheet extends AbstractFloatingView implements Insettab
     public void setTranslationY(float translationY) {
         super.setTranslationY(translationY);
         if (mGradientBackground == null) return;
-        mGradientBackground.setProgress((mTranslationYClosed - translationY) / mTranslationYRange);
+        float p = (mTranslationYClosed - translationY) / mTranslationYRange;
+        boolean showScrim = p <= 0;
+        mGradientBackground.setProgress(p, showScrim);
     }
 
     @Override