public void setBounds(Region bounds) {
   synchronized (mWindowManagerService.mWindowMap) {
     if (mBounds.equals(bounds)) {
       return;
     }
     mBounds.set(bounds);
     invalidate(mDirtyRect);
     if (DEBUG_VIEWPORT_WINDOW) {
       Slog.i(LOG_TAG, "ViewportWindow set bounds: " + bounds);
     }
   }
 }
    public void recomputeBoundsLocked() {
      mWindowManager.getDefaultDisplay().getRealSize(mTempPoint);
      final int screenWidth = mTempPoint.x;
      final int screenHeight = mTempPoint.y;

      Region magnifiedBounds = mMagnifiedBounds;
      magnifiedBounds.set(0, 0, 0, 0);

      Region availableBounds = mTempRegion1;
      availableBounds.set(0, 0, screenWidth, screenHeight);

      Region nonMagnifiedBounds = mTempRegion4;
      nonMagnifiedBounds.set(0, 0, 0, 0);

      SparseArray<WindowStateInfo> visibleWindows = mTempWindowStateInfos;
      visibleWindows.clear();
      getWindowsOnScreenLocked(visibleWindows);

      final int visibleWindowCount = visibleWindows.size();
      for (int i = visibleWindowCount - 1; i >= 0; i--) {
        WindowStateInfo info = visibleWindows.valueAt(i);
        if (info.mWindowState.mAttrs.type
            == WindowManager.LayoutParams.TYPE_MAGNIFICATION_OVERLAY) {
          continue;
        }

        Region windowBounds = mTempRegion2;
        Matrix matrix = mTempMatrix;
        populateTransformationMatrix(info.mWindowState, matrix);
        RectF windowFrame = mTempRectF;

        if (mWindowManagerService.mPolicy.canMagnifyWindow(info.mWindowState.mAttrs.type)) {
          windowFrame.set(info.mWindowState.mFrame);
          windowFrame.offset(-windowFrame.left, -windowFrame.top);
          matrix.mapRect(windowFrame);
          windowBounds.set(
              (int) windowFrame.left,
              (int) windowFrame.top,
              (int) windowFrame.right,
              (int) windowFrame.bottom);
          magnifiedBounds.op(windowBounds, Region.Op.UNION);
          magnifiedBounds.op(availableBounds, Region.Op.INTERSECT);
        } else {
          windowFrame.set(info.mTouchableRegion);
          windowFrame.offset(-info.mWindowState.mFrame.left, -info.mWindowState.mFrame.top);
          matrix.mapRect(windowFrame);
          windowBounds.set(
              (int) windowFrame.left,
              (int) windowFrame.top,
              (int) windowFrame.right,
              (int) windowFrame.bottom);
          nonMagnifiedBounds.op(windowBounds, Region.Op.UNION);
          windowBounds.op(magnifiedBounds, Region.Op.DIFFERENCE);
          availableBounds.op(windowBounds, Region.Op.DIFFERENCE);
        }

        Region accountedBounds = mTempRegion2;
        accountedBounds.set(magnifiedBounds);
        accountedBounds.op(nonMagnifiedBounds, Region.Op.UNION);
        accountedBounds.op(0, 0, screenWidth, screenHeight, Region.Op.INTERSECT);

        if (accountedBounds.isRect()) {
          Rect accountedFrame = mTempRect1;
          accountedBounds.getBounds(accountedFrame);
          if (accountedFrame.width() == screenWidth && accountedFrame.height() == screenHeight) {
            break;
          }
        }
      }

      for (int i = visibleWindowCount - 1; i >= 0; i--) {
        WindowStateInfo info = visibleWindows.valueAt(i);
        info.recycle();
        visibleWindows.removeAt(i);
      }

      magnifiedBounds.op(
          mHalfBorderWidth,
          mHalfBorderWidth,
          screenWidth - mHalfBorderWidth,
          screenHeight - mHalfBorderWidth,
          Region.Op.INTERSECT);

      if (!mOldMagnifiedBounds.equals(magnifiedBounds)) {
        Region bounds = Region.obtain();
        bounds.set(magnifiedBounds);
        mHandler
            .obtainMessage(MyHandler.MESSAGE_NOTIFY_MAGNIFIED_BOUNDS_CHANGED, bounds)
            .sendToTarget();

        mWindow.setBounds(magnifiedBounds);
        Rect dirtyRect = mTempRect1;
        if (mFullRedrawNeeded) {
          mFullRedrawNeeded = false;
          dirtyRect.set(
              mHalfBorderWidth,
              mHalfBorderWidth,
              screenWidth - mHalfBorderWidth,
              screenHeight - mHalfBorderWidth);
          mWindow.invalidate(dirtyRect);
        } else {
          Region dirtyRegion = mTempRegion3;
          dirtyRegion.set(magnifiedBounds);
          dirtyRegion.op(mOldMagnifiedBounds, Region.Op.UNION);
          dirtyRegion.op(nonMagnifiedBounds, Region.Op.INTERSECT);
          dirtyRegion.getBounds(dirtyRect);
          mWindow.invalidate(dirtyRect);
        }

        mOldMagnifiedBounds.set(magnifiedBounds);
      }
    }