android-34/com/android/server/wm/WindowSurfaceController.java - platform/prebuilts/fullsdk/sources - Git at Google

 /*
  * Copyright (C) 2015 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.server.wm;

 import static android.os.Trace.TRACE_TAG_WINDOW_MANAGER;
 import static android.view.SurfaceControl.METADATA_OWNER_PID;
 import static android.view.SurfaceControl.METADATA_OWNER_UID;
 import static android.view.SurfaceControl.METADATA_WINDOW_TYPE;
 import static android.view.SurfaceControl.getGlobalTransaction;

 import static com.android.internal.protolog.ProtoLogGroup.WM_SHOW_SURFACE_ALLOC;
 import static com.android.internal.protolog.ProtoLogGroup.WM_SHOW_TRANSACTIONS;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_VISIBILITY;
 import static com.android.server.wm.WindowManagerDebugConfig.SHOW_LIGHT_TRANSACTIONS;
 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
 import static com.android.server.wm.WindowSurfaceControllerProto.LAYER;
 import static com.android.server.wm.WindowSurfaceControllerProto.SHOWN;

 import android.os.Debug;
 import android.os.Trace;
 import android.util.EventLog;
 import android.util.Slog;
 import android.util.proto.ProtoOutputStream;
 import android.view.SurfaceControl;
 import android.view.WindowContentFrameStats;
 import android.view.WindowManager;

 import com.android.internal.protolog.common.ProtoLog;

 import java.io.PrintWriter;

 class WindowSurfaceController {
     static final String TAG = TAG_WITH_CLASS_NAME ? "WindowSurfaceController" : TAG_WM;

     final WindowStateAnimator mAnimator;

     SurfaceControl mSurfaceControl;

     // Should only be set from within setShown().
     private boolean mSurfaceShown = false;
     private float mSurfaceX = 0;
     private float mSurfaceY = 0;

     // Initialize to the identity matrix.
     private float mLastDsdx = 1;
     private float mLastDtdx = 0;
     private float mLastDsdy = 0;
     private float mLastDtdy = 1;

     private float mSurfaceAlpha = 0;

     private int mSurfaceLayer = 0;

     private final String title;

     private final WindowManagerService mService;

     private final int mWindowType;
     private final Session mWindowSession;

     // Used to track whether we have called detach children on the way to invisibility.
     boolean mChildrenDetached;

     WindowSurfaceController(String name, int format, int flags, WindowStateAnimator animator,
             int windowType) {
         mAnimator = animator;

         title = name;

         mService = animator.mService;
         final WindowState win = animator.mWin;
         mWindowType = windowType;
         mWindowSession = win.mSession;

         Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "new SurfaceControl");
         final SurfaceControl.Builder b = win.makeSurface()
                 .setParent(win.getSurfaceControl())
                 .setName(name)
                 .setFormat(format)
                 .setFlags(flags)
                 .setMetadata(METADATA_WINDOW_TYPE, windowType)
                 .setMetadata(METADATA_OWNER_UID, mWindowSession.mUid)
                 .setMetadata(METADATA_OWNER_PID, mWindowSession.mPid)
                 .setCallsite("WindowSurfaceController");

         final boolean useBLAST = mService.mUseBLAST && ((win.getAttrs().privateFlags
                 & WindowManager.LayoutParams.PRIVATE_FLAG_USE_BLAST) != 0);

         if (useBLAST) {
             b.setBLASTLayer();
         }

         mSurfaceControl = b.build();

         Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
     }

     void hide(SurfaceControl.Transaction transaction, String reason) {
         ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE HIDE ( %s ): %s", reason, title);

         if (mSurfaceShown) {
             hideSurface(transaction);
         }
     }

     private void hideSurface(SurfaceControl.Transaction transaction) {
         if (mSurfaceControl == null) {
             return;
         }
         setShown(false);
         try {
             transaction.hide(mSurfaceControl);
             if (mAnimator.mIsWallpaper) {
                 final DisplayContent dc = mAnimator.mWin.getDisplayContent();
                 EventLog.writeEvent(EventLogTags.WM_WALLPAPER_SURFACE,
                         dc.mDisplayId, 0 /* request hidden */,
                         String.valueOf(dc.mWallpaperController.getWallpaperTarget()));
             }
         } catch (RuntimeException e) {
             Slog.w(TAG, "Exception hiding surface in " + this);
         }
     }

     void destroy(SurfaceControl.Transaction t) {
         ProtoLog.i(WM_SHOW_SURFACE_ALLOC,
                 "Destroying surface %s called by %s", this, Debug.getCallers(8));
         try {
             if (mSurfaceControl != null) {
                 if (mAnimator.mIsWallpaper && !mAnimator.mWin.mWindowRemovalAllowed
                         && !mAnimator.mWin.mRemoveOnExit) {
                     // The wallpaper surface should have the same lifetime as its window.
                     Slog.e(TAG, "Unexpected removing wallpaper surface of " + mAnimator.mWin
                             + " by " + Debug.getCallers(8));
                 }
                 t.remove(mSurfaceControl);
             }
         } catch (RuntimeException e) {
             Slog.w(TAG, "Error destroying surface in: " + this, e);
         } finally {
             setShown(false);
             mSurfaceControl = null;
         }
     }

     void setPosition(SurfaceControl.Transaction t, float left, float top) {
         final boolean surfaceMoved = mSurfaceX != left || mSurfaceY != top;
         if (!surfaceMoved) {
             return;
         }

         mSurfaceX = left;
         mSurfaceY = top;

         ProtoLog.i(WM_SHOW_TRANSACTIONS,
                 "SURFACE POS (setPositionInTransaction) @ (%f,%f): %s", left, top, title);

         t.setPosition(mSurfaceControl, left, top);
     }

     void setMatrix(SurfaceControl.Transaction t, float dsdx, float dtdx, float dtdy, float dsdy) {
         final boolean matrixChanged = mLastDsdx != dsdx || mLastDtdx != dtdx ||
                                       mLastDtdy != dtdy || mLastDsdy != dsdy;
         if (!matrixChanged) {
             return;
         }

         mLastDsdx = dsdx;
         mLastDtdx = dtdx;
         mLastDtdy = dtdy;
         mLastDsdy = dsdy;

         ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE MATRIX [%f,%f,%f,%f]: %s",
                 dsdx, dtdx, dtdy, dsdy, title);
         t.setMatrix(mSurfaceControl, dsdx, dtdx, dtdy, dsdy);
     }

     boolean prepareToShowInTransaction(SurfaceControl.Transaction t, float alpha) {
         if (mSurfaceControl == null) {
             return false;
         }

         mSurfaceAlpha = alpha;
         t.setAlpha(mSurfaceControl, alpha);
         return true;
     }

     void setOpaque(boolean isOpaque) {
         ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE isOpaque=%b: %s", isOpaque, title);

         if (mSurfaceControl == null) {
             return;
         }
         if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, ">>> OPEN TRANSACTION setOpaqueLocked");
         mService.openSurfaceTransaction();
         try {
             getGlobalTransaction().setOpaque(mSurfaceControl, isOpaque);
         } finally {
             mService.closeSurfaceTransaction("setOpaqueLocked");
             if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, "<<< CLOSE TRANSACTION setOpaqueLocked");
         }
     }

     void setSecure(boolean isSecure) {
         ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE isSecure=%b: %s", isSecure, title);

         if (mSurfaceControl == null) {
             return;
         }
         if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, ">>> OPEN TRANSACTION setSecureLocked");
         mService.openSurfaceTransaction();
         try {
             getGlobalTransaction().setSecure(mSurfaceControl, isSecure);

             final DisplayContent dc = mAnimator.mWin.mDisplayContent;
             if (dc != null) {
                 dc.refreshImeSecureFlag(getGlobalTransaction());
             }
         } finally {
             mService.closeSurfaceTransaction("setSecure");
             if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, "<<< CLOSE TRANSACTION setSecureLocked");
         }
     }

     void setColorSpaceAgnostic(SurfaceControl.Transaction t, boolean agnostic) {
         ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE isColorSpaceAgnostic=%b: %s", agnostic, title);

         if (mSurfaceControl == null) {
             return;
         }
         t.setColorSpaceAgnostic(mSurfaceControl, agnostic);
     }

     void showRobustly(SurfaceControl.Transaction t) {
         ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE SHOW (performLayout): %s", title);
         if (DEBUG_VISIBILITY) Slog.v(TAG, "Showing " + this
                 + " during relayout");

         if (mSurfaceShown) {
             return;
         }

         setShown(true);
         t.show(mSurfaceControl);
         if (mAnimator.mIsWallpaper) {
             final DisplayContent dc = mAnimator.mWin.getDisplayContent();
             EventLog.writeEvent(EventLogTags.WM_WALLPAPER_SURFACE,
                     dc.mDisplayId, 1 /* request shown */,
                     String.valueOf(dc.mWallpaperController.getWallpaperTarget()));
         }
     }

     boolean clearWindowContentFrameStats() {
         if (mSurfaceControl == null) {
             return false;
         }
         return mSurfaceControl.clearContentFrameStats();
     }

     boolean getWindowContentFrameStats(WindowContentFrameStats outStats) {
         if (mSurfaceControl == null) {
             return false;
         }
         return mSurfaceControl.getContentFrameStats(outStats);
     }

     boolean hasSurface() {
         return mSurfaceControl != null;
     }

     void getSurfaceControl(SurfaceControl outSurfaceControl) {
         outSurfaceControl.copyFrom(mSurfaceControl, "WindowSurfaceController.getSurfaceControl");
     }

     boolean getShown() {
         return mSurfaceShown;
     }

     void setShown(boolean surfaceShown) {
         mSurfaceShown = surfaceShown;

         mService.updateNonSystemOverlayWindowsVisibilityIfNeeded(mAnimator.mWin, surfaceShown);

         mAnimator.mWin.onSurfaceShownChanged(surfaceShown);

         if (mWindowSession != null) {
             mWindowSession.onWindowSurfaceVisibilityChanged(this, mSurfaceShown, mWindowType);
         }
     }

     void dumpDebug(ProtoOutputStream proto, long fieldId) {
         final long token = proto.start(fieldId);
         proto.write(SHOWN, mSurfaceShown);
         proto.write(LAYER, mSurfaceLayer);
         proto.end(token);
     }

     public void dump(PrintWriter pw, String prefix, boolean dumpAll) {
         if (dumpAll) {
             pw.print(prefix); pw.print("mSurface="); pw.println(mSurfaceControl);
         }
         pw.print(prefix); pw.print("Surface: shown="); pw.print(mSurfaceShown);
         pw.print(" layer="); pw.print(mSurfaceLayer);
         pw.print(" alpha="); pw.print(mSurfaceAlpha);
         pw.print(" rect=("); pw.print(mSurfaceX);
         pw.print(","); pw.print(mSurfaceY); pw.print(") ");
         pw.print(" transform=("); pw.print(mLastDsdx); pw.print(", ");
         pw.print(mLastDtdx); pw.print(", "); pw.print(mLastDsdy);
         pw.print(", "); pw.print(mLastDtdy); pw.println(")");
     }

     @Override
     public String toString() {
         return mSurfaceControl.toString();
     }
 }
	/*
	* Copyright (C) 2015 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.server.wm;

	import static android.os.Trace.TRACE_TAG_WINDOW_MANAGER;
	import static android.view.SurfaceControl.METADATA_OWNER_PID;
	import static android.view.SurfaceControl.METADATA_OWNER_UID;
	import static android.view.SurfaceControl.METADATA_WINDOW_TYPE;
	import static android.view.SurfaceControl.getGlobalTransaction;

	import static com.android.internal.protolog.ProtoLogGroup.WM_SHOW_SURFACE_ALLOC;
	import static com.android.internal.protolog.ProtoLogGroup.WM_SHOW_TRANSACTIONS;
	import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_VISIBILITY;
	import static com.android.server.wm.WindowManagerDebugConfig.SHOW_LIGHT_TRANSACTIONS;
	import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
	import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
	import static com.android.server.wm.WindowSurfaceControllerProto.LAYER;
	import static com.android.server.wm.WindowSurfaceControllerProto.SHOWN;

	import android.os.Debug;
	import android.os.Trace;
	import android.util.EventLog;
	import android.util.Slog;
	import android.util.proto.ProtoOutputStream;
	import android.view.SurfaceControl;
	import android.view.WindowContentFrameStats;
	import android.view.WindowManager;

	import com.android.internal.protolog.common.ProtoLog;

	import java.io.PrintWriter;

	class WindowSurfaceController {
	static final String TAG = TAG_WITH_CLASS_NAME ? "WindowSurfaceController" : TAG_WM;

	final WindowStateAnimator mAnimator;

	SurfaceControl mSurfaceControl;

	// Should only be set from within setShown().
	private boolean mSurfaceShown = false;
	private float mSurfaceX = 0;
	private float mSurfaceY = 0;

	// Initialize to the identity matrix.
	private float mLastDsdx = 1;
	private float mLastDtdx = 0;
	private float mLastDsdy = 0;
	private float mLastDtdy = 1;

	private float mSurfaceAlpha = 0;

	private int mSurfaceLayer = 0;

	private final String title;

	private final WindowManagerService mService;

	private final int mWindowType;
	private final Session mWindowSession;

	// Used to track whether we have called detach children on the way to invisibility.
	boolean mChildrenDetached;

	WindowSurfaceController(String name, int format, int flags, WindowStateAnimator animator,
	int windowType) {
	mAnimator = animator;

	title = name;

	mService = animator.mService;
	final WindowState win = animator.mWin;
	mWindowType = windowType;
	mWindowSession = win.mSession;

	Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "new SurfaceControl");
	final SurfaceControl.Builder b = win.makeSurface()
	.setParent(win.getSurfaceControl())
	.setName(name)
	.setFormat(format)
	.setFlags(flags)
	.setMetadata(METADATA_WINDOW_TYPE, windowType)
	.setMetadata(METADATA_OWNER_UID, mWindowSession.mUid)
	.setMetadata(METADATA_OWNER_PID, mWindowSession.mPid)
	.setCallsite("WindowSurfaceController");

	final boolean useBLAST = mService.mUseBLAST && ((win.getAttrs().privateFlags
	& WindowManager.LayoutParams.PRIVATE_FLAG_USE_BLAST) != 0);

	if (useBLAST) {
	b.setBLASTLayer();
	}

	mSurfaceControl = b.build();

	Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
	}

	void hide(SurfaceControl.Transaction transaction, String reason) {
	ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE HIDE ( %s ): %s", reason, title);

	if (mSurfaceShown) {
	hideSurface(transaction);
	}
	}

	private void hideSurface(SurfaceControl.Transaction transaction) {
	if (mSurfaceControl == null) {
	return;
	}
	setShown(false);
	try {
	transaction.hide(mSurfaceControl);
	if (mAnimator.mIsWallpaper) {
	final DisplayContent dc = mAnimator.mWin.getDisplayContent();
	EventLog.writeEvent(EventLogTags.WM_WALLPAPER_SURFACE,
	dc.mDisplayId, 0 /* request hidden */,
	String.valueOf(dc.mWallpaperController.getWallpaperTarget()));
	}
	} catch (RuntimeException e) {
	Slog.w(TAG, "Exception hiding surface in " + this);
	}
	}

	void destroy(SurfaceControl.Transaction t) {
	ProtoLog.i(WM_SHOW_SURFACE_ALLOC,
	"Destroying surface %s called by %s", this, Debug.getCallers(8));
	try {
	if (mSurfaceControl != null) {
	if (mAnimator.mIsWallpaper && !mAnimator.mWin.mWindowRemovalAllowed
	&& !mAnimator.mWin.mRemoveOnExit) {
	// The wallpaper surface should have the same lifetime as its window.
	Slog.e(TAG, "Unexpected removing wallpaper surface of " + mAnimator.mWin
	+ " by " + Debug.getCallers(8));
	}
	t.remove(mSurfaceControl);
	}
	} catch (RuntimeException e) {
	Slog.w(TAG, "Error destroying surface in: " + this, e);
	} finally {
	setShown(false);
	mSurfaceControl = null;
	}
	}

	void setPosition(SurfaceControl.Transaction t, float left, float top) {
	final boolean surfaceMoved = mSurfaceX != left \|\| mSurfaceY != top;
	if (!surfaceMoved) {
	return;
	}

	mSurfaceX = left;
	mSurfaceY = top;

	ProtoLog.i(WM_SHOW_TRANSACTIONS,
	"SURFACE POS (setPositionInTransaction) @ (%f,%f): %s", left, top, title);

	t.setPosition(mSurfaceControl, left, top);
	}

	void setMatrix(SurfaceControl.Transaction t, float dsdx, float dtdx, float dtdy, float dsdy) {
	final boolean matrixChanged = mLastDsdx != dsdx \|\| mLastDtdx != dtdx \|\|
	mLastDtdy != dtdy \|\| mLastDsdy != dsdy;
	if (!matrixChanged) {
	return;
	}

	mLastDsdx = dsdx;
	mLastDtdx = dtdx;
	mLastDtdy = dtdy;
	mLastDsdy = dsdy;

	ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE MATRIX [%f,%f,%f,%f]: %s",
	dsdx, dtdx, dtdy, dsdy, title);
	t.setMatrix(mSurfaceControl, dsdx, dtdx, dtdy, dsdy);
	}

	boolean prepareToShowInTransaction(SurfaceControl.Transaction t, float alpha) {
	if (mSurfaceControl == null) {
	return false;
	}

	mSurfaceAlpha = alpha;
	t.setAlpha(mSurfaceControl, alpha);
	return true;
	}

	void setOpaque(boolean isOpaque) {
	ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE isOpaque=%b: %s", isOpaque, title);

	if (mSurfaceControl == null) {
	return;
	}
	if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, ">>> OPEN TRANSACTION setOpaqueLocked");
	mService.openSurfaceTransaction();
	try {
	getGlobalTransaction().setOpaque(mSurfaceControl, isOpaque);
	} finally {
	mService.closeSurfaceTransaction("setOpaqueLocked");
	if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, "<<< CLOSE TRANSACTION setOpaqueLocked");
	}
	}

	void setSecure(boolean isSecure) {
	ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE isSecure=%b: %s", isSecure, title);

	if (mSurfaceControl == null) {
	return;
	}
	if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, ">>> OPEN TRANSACTION setSecureLocked");
	mService.openSurfaceTransaction();
	try {
	getGlobalTransaction().setSecure(mSurfaceControl, isSecure);

	final DisplayContent dc = mAnimator.mWin.mDisplayContent;
	if (dc != null) {
	dc.refreshImeSecureFlag(getGlobalTransaction());
	}
	} finally {
	mService.closeSurfaceTransaction("setSecure");
	if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, "<<< CLOSE TRANSACTION setSecureLocked");
	}
	}

	void setColorSpaceAgnostic(SurfaceControl.Transaction t, boolean agnostic) {
	ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE isColorSpaceAgnostic=%b: %s", agnostic, title);

	if (mSurfaceControl == null) {
	return;
	}
	t.setColorSpaceAgnostic(mSurfaceControl, agnostic);
	}

	void showRobustly(SurfaceControl.Transaction t) {
	ProtoLog.i(WM_SHOW_TRANSACTIONS, "SURFACE SHOW (performLayout): %s", title);
	if (DEBUG_VISIBILITY) Slog.v(TAG, "Showing " + this
	+ " during relayout");

	if (mSurfaceShown) {
	return;
	}

	setShown(true);
	t.show(mSurfaceControl);
	if (mAnimator.mIsWallpaper) {
	final DisplayContent dc = mAnimator.mWin.getDisplayContent();
	EventLog.writeEvent(EventLogTags.WM_WALLPAPER_SURFACE,
	dc.mDisplayId, 1 /* request shown */,
	String.valueOf(dc.mWallpaperController.getWallpaperTarget()));
	}
	}

	boolean clearWindowContentFrameStats() {
	if (mSurfaceControl == null) {
	return false;
	}
	return mSurfaceControl.clearContentFrameStats();
	}

	boolean getWindowContentFrameStats(WindowContentFrameStats outStats) {
	if (mSurfaceControl == null) {
	return false;
	}
	return mSurfaceControl.getContentFrameStats(outStats);
	}

	boolean hasSurface() {
	return mSurfaceControl != null;
	}

	void getSurfaceControl(SurfaceControl outSurfaceControl) {
	outSurfaceControl.copyFrom(mSurfaceControl, "WindowSurfaceController.getSurfaceControl");
	}

	boolean getShown() {
	return mSurfaceShown;
	}

	void setShown(boolean surfaceShown) {
	mSurfaceShown = surfaceShown;

	mService.updateNonSystemOverlayWindowsVisibilityIfNeeded(mAnimator.mWin, surfaceShown);

	mAnimator.mWin.onSurfaceShownChanged(surfaceShown);

	if (mWindowSession != null) {
	mWindowSession.onWindowSurfaceVisibilityChanged(this, mSurfaceShown, mWindowType);
	}
	}

	void dumpDebug(ProtoOutputStream proto, long fieldId) {
	final long token = proto.start(fieldId);
	proto.write(SHOWN, mSurfaceShown);
	proto.write(LAYER, mSurfaceLayer);
	proto.end(token);
	}

	public void dump(PrintWriter pw, String prefix, boolean dumpAll) {
	if (dumpAll) {
	pw.print(prefix); pw.print("mSurface="); pw.println(mSurfaceControl);
	}
	pw.print(prefix); pw.print("Surface: shown="); pw.print(mSurfaceShown);
	pw.print(" layer="); pw.print(mSurfaceLayer);
	pw.print(" alpha="); pw.print(mSurfaceAlpha);
	pw.print(" rect=("); pw.print(mSurfaceX);
	pw.print(","); pw.print(mSurfaceY); pw.print(") ");
	pw.print(" transform=("); pw.print(mLastDsdx); pw.print(", ");
	pw.print(mLastDtdx); pw.print(", "); pw.print(mLastDsdy);
	pw.print(", "); pw.print(mLastDtdy); pw.println(")");
	}

	@Override
	public String toString() {
	return mSurfaceControl.toString();
	}
	}