Restrict the overridden min size for PiP

Per go/cdd-proposal-pip-size, the absolute minimum size when overridden
should be 48dp.

Bug: 174302616
Test: atest PinnedStackTests#testEnterPipWithTinyMinimalSize \
            WMShellUnitTests:com.android.wm.shell.pip
Merged-In: I2f0dfd9a79049aaf696fde8703994deaecce63f5
Change-Id: I2f0dfd9a79049aaf696fde8703994deaecce63f5

core/res/res/values/dimens.xml

@@ -690,6 +690,13 @@
     <!-- The default minimal size of a PiP task, in both dimensions. -->
     <dimen name="default_minimal_size_pip_resizable_task">108dp</dimen>
 
+    <!--
+      The overridable minimal size of a PiP task, in both dimensions.
+      Different from default_minimal_size_pip_resizable_task, this is to limit the dimension
+      when the pinned stack size is overridden by app via minWidth/minHeight.
+    -->
+    <dimen name="overridable_minimal_size_pip_resizable_task">48dp</dimen>
+
     <!-- Height of a task when in minimized mode from the top when launcher is resizable. -->
     <dimen name="task_height_of_minimized_mode">80dp</dimen>
 

core/res/res/values/symbols.xml

@@ -1948,6 +1948,7 @@
   <java-symbol type="fraction" name="config_dimBehindFadeDuration" />
   <java-symbol type="dimen" name="default_minimal_size_resizable_task" />
   <java-symbol type="dimen" name="default_minimal_size_pip_resizable_task" />
+  <java-symbol type="dimen" name="overridable_minimal_size_pip_resizable_task" />
   <java-symbol type="dimen" name="task_height_of_minimized_mode" />
   <java-symbol type="fraction" name="config_screenAutoBrightnessDozeScaleFactor" />
   <java-symbol type="bool" name="config_allowPriorityVibrationsInLowPowerMode" />

libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipBoundsAlgorithm.java

@@ -54,6 +54,7 @@ public class PipBoundsAlgorithm {
     private float mMaxAspectRatio;
     private int mDefaultStackGravity;
     private int mDefaultMinSize;
+    private int mOverridableMinSize;
     private Point mScreenEdgeInsets;
 
     public PipBoundsAlgorithm(Context context, @NonNull PipBoundsState pipBoundsState) {
@@ -78,6 +79,8 @@ public class PipBoundsAlgorithm {
                 com.android.internal.R.integer.config_defaultPictureInPictureGravity);
         mDefaultMinSize = res.getDimensionPixelSize(
                 com.android.internal.R.dimen.default_minimal_size_pip_resizable_task);
+        mOverridableMinSize = res.getDimensionPixelSize(
+                com.android.internal.R.dimen.overridable_minimal_size_pip_resizable_task);
         final String screenEdgeInsetsDpString = res.getString(
                 com.android.internal.R.string.config_defaultPictureInPictureScreenEdgeInsets);
         final Size screenEdgeInsetsDp = !screenEdgeInsetsDpString.isEmpty()
@@ -155,7 +158,10 @@ public class PipBoundsAlgorithm {
         // -1 will be populated if an activity specifies defaultWidth/defaultHeight in <layout>
         // without minWidth/minHeight
         if (windowLayout.minWidth > 0 && windowLayout.minHeight > 0) {
-            return new Size(windowLayout.minWidth, windowLayout.minHeight);
+            // If either dimension is smaller than the allowed minimum, adjust them
+            // according to mOverridableMinSize
+            return new Size(Math.max(windowLayout.minWidth, mOverridableMinSize),
+                    Math.max(windowLayout.minHeight, mOverridableMinSize));
         }
         return null;
     }

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/pip/PipTaskOrganizerTest.java

@@ -43,7 +43,6 @@ import com.android.wm.shell.ShellTestCase;
 import com.android.wm.shell.TestShellExecutor;
 import com.android.wm.shell.common.DisplayController;
 import com.android.wm.shell.common.DisplayLayout;
-import com.android.wm.shell.legacysplitscreen.LegacySplitScreen;
 import com.android.wm.shell.legacysplitscreen.LegacySplitScreenController;
 import com.android.wm.shell.pip.phone.PhonePipMenuController;
 
@@ -125,7 +124,7 @@ public class PipTaskOrganizerTest extends ShellTestCase {
 
     @Test
     public void startSwipePipToHome_updatesOverrideMinSize() {
-        final Size minSize = new Size(100, 80);
+        final Size minSize = new Size(400, 320);
 
         mSpiedPipTaskOrganizer.startSwipePipToHome(mComponent1, createActivityInfo(minSize),
                 createPipParams(null));
@@ -153,7 +152,7 @@ public class PipTaskOrganizerTest extends ShellTestCase {
 
     @Test
     public void onTaskAppeared_updatesOverrideMinSize() {
-        final Size minSize = new Size(100, 80);
+        final Size minSize = new Size(400, 320);
 
         mSpiedPipTaskOrganizer.onTaskAppeared(
                 createTaskInfo(mComponent1, createPipParams(null), minSize),
@@ -191,7 +190,7 @@ public class PipTaskOrganizerTest extends ShellTestCase {
         mSpiedPipTaskOrganizer.onTaskAppeared(createTaskInfo(mComponent1,
                 createPipParams(null)), null /* leash */);
 
-        final Size minSize = new Size(100, 80);
+        final Size minSize = new Size(400, 320);
         mSpiedPipTaskOrganizer.onTaskInfoChanged(createTaskInfo(mComponent2,
                 createPipParams(null), minSize));