Implement transition for docking task in recents #3

- Implement clipping for thumbnail.

Bug: 27607141
Change-Id: Ic3ba0acf685341ad715fae1601fad5eba1a93e44

services/core/java/com/android/server/wm/AppTransition.java

@@ -871,8 +871,8 @@ public class AppTransition implements Dump {
      * This animation runs for the thumbnail that gets cross faded with the enter/exit activity
      * when a thumbnail is specified with the pending animation override.
      */
-    Animation createThumbnailAspectScaleAnimationLocked(Rect appRect, Bitmap thumbnailHeader,
-            final int taskId) {
+    Animation createThumbnailAspectScaleAnimationLocked(Rect appRect, @Nullable Rect contentInsets,
+            Bitmap thumbnailHeader, final int taskId) {
         Animation a;
         final int thumbWidthI = thumbnailHeader.getWidth();
         final float thumbWidth = thumbWidthI > 0 ? thumbWidthI : 1;
@@ -900,11 +900,35 @@ public class AppTransition implements Dump {
             translate.setInterpolator(TOUCH_RESPONSE_INTERPOLATOR);
             translate.setDuration(THUMBNAIL_APP_TRANSITION_DURATION);
 
+            float thumbScale = thumbWidth / (appWidth - (contentInsets != null
+                    ? contentInsets.left - contentInsets.right : 0));
+
+            mTmpFromClipRect.set(0, 0, thumbWidthI, thumbHeightI);
+            mTmpToClipRect.set(appRect);
+
+            // Containing frame is in screen space, but we need the clip rect in the
+            // app space.
+            mTmpToClipRect.offsetTo(0, 0);
+            mTmpToClipRect.right = (int) (mTmpToClipRect.right * thumbScale);
+            mTmpToClipRect.bottom = (int) (mTmpToClipRect.bottom * thumbScale);
+
+            if (contentInsets != null) {
+                mTmpToClipRect.inset((int) (-contentInsets.left * thumbScale),
+                        (int) (-contentInsets.top * thumbScale),
+                        (int) (-contentInsets.right * thumbScale),
+                        (int) (-contentInsets.bottom * thumbScale));
+            }
+
+            Animation clipAnim = new ClipRectAnimation(mTmpFromClipRect, mTmpToClipRect);
+            clipAnim.setInterpolator(TOUCH_RESPONSE_INTERPOLATOR);
+            clipAnim.setDuration(THUMBNAIL_APP_TRANSITION_DURATION);
+
             // This AnimationSet uses the Interpolators assigned above.
             AnimationSet set = new AnimationSet(false);
             set.addAnimation(scale);
             set.addAnimation(alpha);
             set.addAnimation(translate);
+            set.addAnimation(clipAnim);
             a = set;
         } else {
             // Animation down from the full screen to the thumbnail

services/core/java/com/android/server/wm/AppWindowAnimator.java

@@ -288,6 +288,7 @@ public class AppWindowAnimator {
         }
         thumbnail.setMatrix(tmpFloats[Matrix.MSCALE_X], tmpFloats[Matrix.MSKEW_Y],
                 tmpFloats[Matrix.MSKEW_X], tmpFloats[Matrix.MSCALE_Y]);
+        thumbnail.setWindowCrop(thumbnailTransformation.getClipRect());
     }
 
     /**

services/core/java/com/android/server/wm/WindowSurfacePlacer.java

@@ -1576,12 +1576,13 @@ class WindowSurfacePlacer {
                 WindowState win = appToken.findMainWindow();
                 Rect appRect = win != null ? win.getContentFrameLw() :
                         new Rect(0, 0, displayInfo.appWidth, displayInfo.appHeight);
+                Rect insets = win != null ? win.mContentInsets : null;
                 // For the new aspect-scaled transition, we want it to always show
                 // above the animating opening/closing window, and we want to
                 // synchronize its thumbnail surface with the surface for the
                 // open/close animation (only on the way down)
                 anim = mService.mAppTransition.createThumbnailAspectScaleAnimationLocked(appRect,
-                        thumbnailHeader, taskId);
+                        insets, thumbnailHeader, taskId);
                 openingAppAnimator.thumbnailForceAboveLayer = Math.max(openingLayer, closingLayer);
                 openingAppAnimator.deferThumbnailDestruction =
                         !mService.mAppTransition.isNextThumbnailTransitionScaleUp();