Only set task shadow/corner for freeform tasks

Couple of changes to prevent unintended shadows on non-freeform windows:
1) Makes RelayoutParams's shadow radius take pixels instead of a
   resource to align with corner radius
2) Moves (incomplete, only checked fullscreen) windowing-mode check to
   skip shadow radius out of WindowDecoration.java into
   DesktopModeWindowDecoration.
3) Adds an INVALID_SHADOW_RADIUS to signal none should be set, also to
   align with corner radius

Fix: 375300371
Flag: EXEMPT bug fix
Test: enter split-screen, swipe up to show taskbar, verify one side
doesn't get darker (because of a shadow)

Change-Id: I9c34b3e3701faec0bb671e1b350a807fe1ee3079
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecoration.java b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecoration.java
index 982fda0..aa954fb 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecoration.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecoration.java
@@ -194,6 +194,7 @@
     @VisibleForTesting
     static void updateRelayoutParams(
             RelayoutParams relayoutParams,
+            @NonNull Context context,
             ActivityManager.RunningTaskInfo taskInfo,
             boolean applyStartTransactionOnDraw,
             boolean shouldSetTaskVisibilityPositionAndCrop,
@@ -206,9 +207,11 @@
         relayoutParams.mRunningTaskInfo = taskInfo;
         relayoutParams.mLayoutResId = R.layout.caption_window_decor;
         relayoutParams.mCaptionHeightId = getCaptionHeightIdStatic(taskInfo.getWindowingMode());
-        relayoutParams.mShadowRadiusId = hasGlobalFocus
-                ? R.dimen.freeform_decor_shadow_focused_thickness
-                : R.dimen.freeform_decor_shadow_unfocused_thickness;
+        relayoutParams.mShadowRadius = hasGlobalFocus
+                ? context.getResources().getDimensionPixelSize(
+                        R.dimen.freeform_decor_shadow_focused_thickness)
+                : context.getResources().getDimensionPixelSize(
+                        R.dimen.freeform_decor_shadow_unfocused_thickness);
         relayoutParams.mApplyStartTransactionOnDraw = applyStartTransactionOnDraw;
         relayoutParams.mSetTaskVisibilityPositionAndCrop = shouldSetTaskVisibilityPositionAndCrop;
         relayoutParams.mIsCaptionVisible = taskInfo.isFreeform()
@@ -251,7 +254,7 @@
         final SurfaceControl oldDecorationSurface = mDecorationContainerSurface;
         final WindowContainerTransaction wct = new WindowContainerTransaction();
 
-        updateRelayoutParams(mRelayoutParams, taskInfo, applyStartTransactionOnDraw,
+        updateRelayoutParams(mRelayoutParams, mContext, taskInfo, applyStartTransactionOnDraw,
                 shouldSetTaskVisibilityPositionAndCrop, mIsStatusBarVisible,
                 mIsKeyguardVisibleAndOccluded,
                 mDisplayController.getInsetsState(taskInfo.displayId), hasGlobalFocus,
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecoration.java b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecoration.java
index 96cc559..5eb0312 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecoration.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecoration.java
@@ -980,10 +980,15 @@
             relayoutParams.mInputFeatures
                     |= WindowManager.LayoutParams.INPUT_FEATURE_NO_INPUT_CHANNEL;
         }
-        if (DesktopModeStatus.useWindowShadow(/* isFocusedWindow= */ hasGlobalFocus)) {
-            relayoutParams.mShadowRadiusId = hasGlobalFocus
-                    ? R.dimen.freeform_decor_shadow_focused_thickness
-                    : R.dimen.freeform_decor_shadow_unfocused_thickness;
+        if (isAppHeader
+                && DesktopModeStatus.useWindowShadow(/* isFocusedWindow= */ hasGlobalFocus)) {
+            relayoutParams.mShadowRadius = hasGlobalFocus
+                    ? context.getResources().getDimensionPixelSize(
+                            R.dimen.freeform_decor_shadow_focused_thickness)
+                    : context.getResources().getDimensionPixelSize(
+                            R.dimen.freeform_decor_shadow_unfocused_thickness);
+        } else {
+            relayoutParams.mShadowRadius = INVALID_SHADOW_RADIUS;
         }
         relayoutParams.mApplyStartTransactionOnDraw = applyStartTransactionOnDraw;
         relayoutParams.mSetTaskVisibilityPositionAndCrop = shouldSetTaskVisibilityPositionAndCrop;
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/WindowDecoration.java b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/WindowDecoration.java
index 852eee5f..584ee39 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/WindowDecoration.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/WindowDecoration.java
@@ -17,7 +17,6 @@
 package com.android.wm.shell.windowdecor;
 
 import static android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM;
-import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
 import static android.content.res.Configuration.DENSITY_DPI_UNDEFINED;
 import static android.view.WindowInsets.Type.captionBar;
 import static android.view.WindowInsets.Type.mandatorySystemGestures;
@@ -110,6 +109,10 @@
      * Invalid corner radius that signifies that corner radius should not be set.
      */
     static final int INVALID_CORNER_RADIUS = -1;
+    /**
+     * Invalid corner radius that signifies that shadow radius should not be set.
+     */
+    static final int INVALID_SHADOW_RADIUS = -1;
 
     /**
      * System-wide context. Only used to create context with overridden configurations.
@@ -439,16 +442,10 @@
                     .setPosition(mTaskSurface, taskPosition.x, taskPosition.y);
         }
 
-        float shadowRadius;
-        if (mTaskInfo.getWindowingMode() == WINDOWING_MODE_FULLSCREEN) {
-            // Shadow is not needed for fullscreen tasks
-            shadowRadius = 0;
-        } else {
-            shadowRadius =
-                    loadDimension(mDecorWindowContext.getResources(), params.mShadowRadiusId);
+        if (params.mShadowRadius != INVALID_SHADOW_RADIUS) {
+            startT.setShadowRadius(mTaskSurface, params.mShadowRadius);
+            finishT.setShadowRadius(mTaskSurface, params.mShadowRadius);
         }
-        startT.setShadowRadius(mTaskSurface, shadowRadius);
-        finishT.setShadowRadius(mTaskSurface, shadowRadius);
 
         if (params.mSetTaskVisibilityPositionAndCrop) {
             startT.show(mTaskSurface);
@@ -851,8 +848,8 @@
         @InsetsSource.Flags int mInsetSourceFlags;
         final Region mDisplayExclusionRegion = Region.obtain();
 
-        int mShadowRadiusId;
-        int mCornerRadius;
+        int mShadowRadius = INVALID_SHADOW_RADIUS;
+        int mCornerRadius = INVALID_CORNER_RADIUS;
 
         int mCaptionTopPadding;
         boolean mIsCaptionVisible;
@@ -874,8 +871,8 @@
             mInsetSourceFlags = 0;
             mDisplayExclusionRegion.setEmpty();
 
-            mShadowRadiusId = Resources.ID_NULL;
-            mCornerRadius = 0;
+            mShadowRadius = INVALID_SHADOW_RADIUS;
+            mCornerRadius = INVALID_SHADOW_RADIUS;
 
             mCaptionTopPadding = 0;
             mIsCaptionVisible = false;
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/CaptionWindowDecorationTests.kt b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/CaptionWindowDecorationTests.kt
index 59141ca..b856a28 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/CaptionWindowDecorationTests.kt
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/CaptionWindowDecorationTests.kt
@@ -48,6 +48,7 @@
 
         CaptionWindowDecoration.updateRelayoutParams(
             relayoutParams,
+            mContext,
             taskInfo,
             true,
             false,
@@ -71,6 +72,7 @@
 
         CaptionWindowDecoration.updateRelayoutParams(
             relayoutParams,
+            mContext,
             taskInfo,
             true,
             false,
@@ -90,6 +92,7 @@
         val relayoutParams = WindowDecoration.RelayoutParams()
         CaptionWindowDecoration.updateRelayoutParams(
             relayoutParams,
+            mContext,
             taskInfo,
             true,
             false,
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorationTests.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorationTests.java
index e390fbb..03c7c98 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorationTests.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorationTests.java
@@ -61,7 +61,6 @@
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
-import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.PointF;
 import android.graphics.Rect;
@@ -295,8 +294,9 @@
     }
 
     @Test
-    public void updateRelayoutParams_noSysPropFlagsSet_windowShadowsAreEnabled() {
+    public void updateRelayoutParams_noSysPropFlagsSet_windowShadowsAreSetForFreeform() {
         final ActivityManager.RunningTaskInfo taskInfo = createTaskInfo(/* visible= */ true);
+        taskInfo.configuration.windowConfiguration.setWindowingMode(WINDOWING_MODE_FREEFORM);
         RelayoutParams relayoutParams = new RelayoutParams();
 
         DesktopModeWindowDecoration.updateRelayoutParams(
@@ -309,7 +309,46 @@
                 /* hasGlobalFocus= */ true,
                 mExclusionRegion);
 
-        assertThat(relayoutParams.mShadowRadiusId).isNotEqualTo(Resources.ID_NULL);
+        assertThat(relayoutParams.mShadowRadius)
+                .isNotEqualTo(WindowDecoration.INVALID_SHADOW_RADIUS);
+    }
+
+    @Test
+    public void updateRelayoutParams_noSysPropFlagsSet_windowShadowsAreNotSetForFullscreen() {
+        final ActivityManager.RunningTaskInfo taskInfo = createTaskInfo(/* visible= */ true);
+        taskInfo.configuration.windowConfiguration.setWindowingMode(WINDOWING_MODE_FULLSCREEN);
+        RelayoutParams relayoutParams = new RelayoutParams();
+
+        DesktopModeWindowDecoration.updateRelayoutParams(
+                relayoutParams, mContext, taskInfo, /* applyStartTransactionOnDraw= */ true,
+                /* shouldSetTaskPositionAndCrop */ false,
+                /* isStatusBarVisible */ true,
+                /* isKeyguardVisibleAndOccluded */ false,
+                /* inFullImmersiveMode */ false,
+                new InsetsState(),
+                /* hasGlobalFocus= */ true,
+                mExclusionRegion);
+
+        assertThat(relayoutParams.mShadowRadius).isEqualTo(WindowDecoration.INVALID_SHADOW_RADIUS);
+    }
+
+    @Test
+    public void updateRelayoutParams_noSysPropFlagsSet_windowShadowsAreNotSetForSplit() {
+        final ActivityManager.RunningTaskInfo taskInfo = createTaskInfo(/* visible= */ true);
+        taskInfo.configuration.windowConfiguration.setWindowingMode(WINDOWING_MODE_MULTI_WINDOW);
+        RelayoutParams relayoutParams = new RelayoutParams();
+
+        DesktopModeWindowDecoration.updateRelayoutParams(
+                relayoutParams, mContext, taskInfo, /* applyStartTransactionOnDraw= */ true,
+                /* shouldSetTaskPositionAndCrop */ false,
+                /* isStatusBarVisible */ true,
+                /* isKeyguardVisibleAndOccluded */ false,
+                /* inFullImmersiveMode */ false,
+                new InsetsState(),
+                /* hasGlobalFocus= */ true,
+                mExclusionRegion);
+
+        assertThat(relayoutParams.mShadowRadius).isEqualTo(WindowDecoration.INVALID_SHADOW_RADIUS);
     }
 
     @Test
@@ -359,6 +398,29 @@
     }
 
     @Test
+    public void updateRelayoutParams_noSysPropFlagsSet_roundedCornersNotSetForSplit() {
+        final ActivityManager.RunningTaskInfo taskInfo = createTaskInfo(/* visible= */ true);
+        taskInfo.configuration.windowConfiguration.setWindowingMode(WINDOWING_MODE_MULTI_WINDOW);
+        fillRoundedCornersResources(/* fillValue= */ 30);
+        RelayoutParams relayoutParams = new RelayoutParams();
+
+        DesktopModeWindowDecoration.updateRelayoutParams(
+                relayoutParams,
+                mTestableContext,
+                taskInfo,
+                /* applyStartTransactionOnDraw= */ true,
+                /* shouldSetTaskPositionAndCrop */ false,
+                /* isStatusBarVisible */ true,
+                /* isKeyguardVisibleAndOccluded */ false,
+                /* inFullImmersiveMode */ false,
+                new InsetsState(),
+                /* hasGlobalFocus= */ true,
+                mExclusionRegion);
+
+        assertThat(relayoutParams.mCornerRadius).isEqualTo(INVALID_CORNER_RADIUS);
+    }
+
+    @Test
     @EnableFlags(Flags.FLAG_ENABLE_APP_HEADER_WITH_TASK_DENSITY)
     public void updateRelayoutParams_appHeader_usesTaskDensity() {
         final int systemDensity = mTestableContext.getOrCreateTestableResources().getResources()
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/WindowDecorationTests.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/WindowDecorationTests.java
index 534803d..04b2be0 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/WindowDecorationTests.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/WindowDecorationTests.java
@@ -114,6 +114,7 @@
     private static final Rect TASK_BOUNDS = new Rect(100, 300, 400, 400);
     private static final Point TASK_POSITION_IN_PARENT = new Point(40, 60);
     private static final int CORNER_RADIUS = 20;
+    private static final int SHADOW_RADIUS = 10;
     private static final int STATUS_BAR_INSET_SOURCE_ID = 0;
 
     @Rule
@@ -162,7 +163,7 @@
         mRelayoutParams.mLayoutResId = 0;
         mRelayoutParams.mCaptionHeightId = R.dimen.test_freeform_decor_caption_height;
         mCaptionMenuWidthId = R.dimen.test_freeform_decor_caption_menu_width;
-        mRelayoutParams.mShadowRadiusId = R.dimen.test_window_decor_shadow_radius;
+        mRelayoutParams.mShadowRadius = SHADOW_RADIUS;
         mRelayoutParams.mCornerRadius = CORNER_RADIUS;
 
         when(mMockDisplayController.getDisplay(Display.DEFAULT_DISPLAY))
@@ -280,7 +281,7 @@
 
         verify(mMockSurfaceControlStartT).setCornerRadius(mMockTaskSurface, CORNER_RADIUS);
         verify(mMockSurfaceControlFinishT).setCornerRadius(mMockTaskSurface, CORNER_RADIUS);
-        verify(mMockSurfaceControlStartT).setShadowRadius(mMockTaskSurface, 10);
+        verify(mMockSurfaceControlStartT).setShadowRadius(mMockTaskSurface, SHADOW_RADIUS);
 
         assertEquals(300, mRelayoutResult.mWidth);
         assertEquals(100, mRelayoutResult.mHeight);