Merge "Ensure surfaces only resize during relayout." into nyc-dev

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

@@ -2834,6 +2834,8 @@ public class WindowManagerService extends IWindowManager.Stub
             }
 
             win.mRelayoutCalled = true;
+            win.mInRelayout = true;
+
             final int oldVisibility = win.mViewVisibility;
             win.mViewVisibility = viewVisibility;
             if (DEBUG_SCREEN_ON) {
@@ -2974,6 +2976,7 @@ public class WindowManagerService extends IWindowManager.Stub
             if (DEBUG_LAYOUT) {
                 Slog.v(TAG_WM, "Relayout complete " + win + ": outFrame=" + outFrame.toShortString());
             }
+            win.mInRelayout = false;
         }
 
         if (configChanged) {

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

@@ -362,6 +362,8 @@ final class WindowState implements WindowManagerPolicy.WindowState {
      */
     boolean mRelayoutCalled;
 
+    boolean mInRelayout;
+
     /**
      * If the application has called relayout() with changes that can
      * impact its window's size, we need to perform a layout pass on it
@@ -1630,6 +1632,12 @@ final class WindowState implements WindowManagerPolicy.WindowState {
         return task != null && task.inDockedWorkspace();
     }
 
+    // TODO: Strange usage of word workspace here and above.
+    boolean inPinnedWorkspace() {
+        final Task task = getTask();
+        return task != null && task.inPinnedWorkspace();
+    }
+
     boolean isDockedInEffect() {
         final Task task = getTask();
         return task != null && task.isDockedInEffect();

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

@@ -1428,8 +1428,24 @@ class WindowStateAnimator {
         float extraHScale = (float) 1.0;
         float extraVScale = (float) 1.0;
 
-        mSurfaceResized = mSurfaceController.setSizeInTransaction(
-                mTmpSize.width(), mTmpSize.height(), recoveringMemory);
+        // Once relayout has been called at least once, we need to make sure
+        // we only resize the client surface during calls to relayout. For
+        // clients which use indeterminate measure specs (MATCH_PARENT),
+        // we may try and change their window size without a call to relayout.
+        // However, this would be unsafe, as the client may be in the middle
+        // of producing a frame at the old size, having just completed layout
+        // to find the surface size changed underneath it.
+        //
+        // TODO: For N we only apply this fix to the pinned workspace. As we
+        // aren't observing known issues here outside of PiP resizing. (Typically
+        // the other windows that use -1 are PopupWindows which aren't likely
+        // to be rendering while we resize).
+        if (!w.inPinnedWorkspace() || (!w.mRelayoutCalled || w.mInRelayout)) {
+            mSurfaceResized = mSurfaceController.setSizeInTransaction(
+                    mTmpSize.width(), mTmpSize.height(), recoveringMemory);
+        } else {
+            mSurfaceResized = false;
+        }
         mForceScaleUntilResize = mForceScaleUntilResize && !mSurfaceResized;
 
 
@@ -1437,10 +1453,12 @@ class WindowStateAnimator {
         if ((task != null && task.mStack.getForceScaleToCrop()) || mForceScaleUntilResize) {
             int hInsets = w.getAttrs().surfaceInsets.left + w.getAttrs().surfaceInsets.right;
             int vInsets = w.getAttrs().surfaceInsets.top + w.getAttrs().surfaceInsets.bottom;
+            float surfaceWidth = mSurfaceController.getWidth();
+            float surfaceHeight = mSurfaceController.getHeight();
             // We want to calculate the scaling based on the content area, not based on
             // the entire surface, so that we scale in sync with windows that don't have insets.
-            extraHScale = (mTmpClipRect.width() - hInsets) / (float)(mTmpSize.width() - hInsets);
-            extraVScale = (mTmpClipRect.height() - vInsets) / (float)(mTmpSize.height() - vInsets);
+            extraHScale = (mTmpClipRect.width() - hInsets) / (float)(surfaceWidth - hInsets);
+            extraVScale = (mTmpClipRect.height() - vInsets) / (float)(surfaceHeight - vInsets);
 
             // In the case of ForceScaleToCrop we scale entire tasks together,
             // and so we need to scale our offsets relative to the task bounds
@@ -1462,7 +1480,7 @@ class WindowStateAnimator {
             // Since we are scaled to fit in our previously desired crop, we can now
             // expose the whole window in buffer space, and not risk extending
             // past where the system would have cropped us
-            mTmpClipRect.set(0, 0, mTmpSize.width(), mTmpSize.height());
+            mTmpClipRect.set(0, 0, (int)surfaceWidth, (int)surfaceHeight);
             mTmpFinalClipRect.setEmpty();
 
             // Various surfaces in the scaled stack may resize at different times.

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

@@ -454,6 +454,15 @@ class WindowSurfaceController {
         return mSurfaceY;
     }
 
+    float getWidth() {
+        return mSurfaceW;
+    }
+
+    float getHeight() {
+        return mSurfaceH;
+    }
+
+
     public void dump(PrintWriter pw, String prefix, boolean dumpAll) {
         if (dumpAll) {
             pw.print(prefix); pw.print("mSurface="); pw.println(mSurfaceControl);