packages/SystemUI/src/com/android/systemui/ImageWallpaper.java - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2009 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.systemui;

 import java.io.IOException;

 import android.app.WallpaperManager;
 import android.graphics.Canvas;
 import android.graphics.Rect;
 import android.graphics.Region.Op;
 import android.graphics.drawable.Drawable;
 import android.os.Handler;
 import android.service.wallpaper.WallpaperService;
 import android.util.Log;
 import android.util.Slog;
 import android.view.MotionEvent;
 import android.view.SurfaceHolder;
 import android.content.Context;
 import android.content.IntentFilter;
 import android.content.Intent;
 import android.content.BroadcastReceiver;

 /**
  * Default built-in wallpaper that simply shows a static image.
  */
 public class ImageWallpaper extends WallpaperService {
     private static final String TAG = "ImageWallpaper";
     private static final boolean DEBUG = false;

     static final boolean FIXED_SIZED_SURFACE = true;

     WallpaperManager mWallpaperManager;
     private Handler mHandler;

     @Override
     public void onCreate() {
         super.onCreate();
         mWallpaperManager = (WallpaperManager) getSystemService(WALLPAPER_SERVICE);
         mHandler = new Handler();
     }

     public Engine onCreateEngine() {
         return new DrawableEngine();
     }

     class DrawableEngine extends Engine {
         private final Object mLock = new Object();
         private WallpaperObserver mReceiver;
         Drawable mBackground;
         int mBackgroundWidth = -1, mBackgroundHeight = -1;
         float mXOffset;
         float mYOffset;

         boolean mVisible = true;
         boolean mRedrawNeeded;
         boolean mOffsetsChanged;
         int mLastXTranslation;
         int mLastYTranslation;

         class WallpaperObserver extends BroadcastReceiver {
             public void onReceive(Context context, Intent intent) {
                 if (DEBUG) {
                     Log.d(TAG, "onReceive");
                 }

                 synchronized (mLock) {
                     mBackgroundWidth = mBackgroundHeight = -1;
                     mBackground = null;
                     mRedrawNeeded = true;
                     drawFrameLocked();
                 }
             }
         }

         @Override
         public void onCreate(SurfaceHolder surfaceHolder) {
             if (DEBUG) {
                 Log.d(TAG, "onCreate");
             }

             super.onCreate(surfaceHolder);

             // Don't need this currently because the wallpaper service
             // will restart the image wallpaper whenever the image changes.
             //IntentFilter filter = new IntentFilter(Intent.ACTION_WALLPAPER_CHANGED);
             //mReceiver = new WallpaperObserver();
             //registerReceiver(mReceiver, filter, null, mHandler);

             updateSurfaceSize(surfaceHolder);
         }

         @Override
         public void onDestroy() {
             super.onDestroy();
             if (mReceiver != null) {
                 unregisterReceiver(mReceiver);
             }
         }

         @Override
         public void onDesiredSizeChanged(int desiredWidth, int desiredHeight) {
             super.onDesiredSizeChanged(desiredWidth, desiredHeight);
             SurfaceHolder surfaceHolder = getSurfaceHolder();
             if (surfaceHolder != null) {
                 updateSurfaceSize(surfaceHolder);
             }
         }

         void updateSurfaceSize(SurfaceHolder surfaceHolder) {
             if (FIXED_SIZED_SURFACE) {
                 // Used a fixed size surface, because we are special.  We can do
                 // this because we know the current design of window animations doesn't
                 // cause this to break.
                 surfaceHolder.setFixedSize(getDesiredMinimumWidth(), getDesiredMinimumHeight());
             } else {
                 surfaceHolder.setSizeFromLayout();
             }
         }

         @Override
         public void onVisibilityChanged(boolean visible) {
             if (DEBUG) {
                 Log.d(TAG, "onVisibilityChanged: visible=" + visible);
             }

             synchronized (mLock) {
                 if (mVisible != visible) {
                     if (DEBUG) {
                         Log.d(TAG, "Visibility changed to visible=" + visible);
                     }
                     mVisible = visible;
                     drawFrameLocked();
                 }
             }
         }

         @Override
         public void onTouchEvent(MotionEvent event) {
             super.onTouchEvent(event);
         }

         @Override
         public void onOffsetsChanged(float xOffset, float yOffset,
                 float xOffsetStep, float yOffsetStep,
                 int xPixels, int yPixels) {
             if (DEBUG) {
                 Log.d(TAG, "onOffsetsChanged: xOffset=" + xOffset + ", yOffset=" + yOffset
                         + ", xOffsetStep=" + xOffsetStep + ", yOffsetStep=" + yOffsetStep
                         + ", xPixels=" + xPixels + ", yPixels=" + yPixels);
             }

             synchronized (mLock) {
                 if (mXOffset != xOffset || mYOffset != yOffset) {
                     if (DEBUG) {
                         Log.d(TAG, "Offsets changed to (" + xOffset + "," + yOffset + ").");
                     }
                     mXOffset = xOffset;
                     mYOffset = yOffset;
                     mOffsetsChanged = true;
                 }
                 drawFrameLocked();
             }
         }

         @Override
         public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
             if (DEBUG) {
                 Log.d(TAG, "onSurfaceChanged: width=" + width + ", height=" + height);
             }

             super.onSurfaceChanged(holder, format, width, height);

             synchronized (mLock) {
                 mRedrawNeeded = true;
                 drawFrameLocked();
             }
         }

         void drawFrameLocked() {
             if (!mVisible) {
                 if (DEBUG) {
                     Log.d(TAG, "Suppressed drawFrame since wallpaper is not visible.");
                 }
                 return;
             }
             if (!mRedrawNeeded && !mOffsetsChanged) {
                 if (DEBUG) {
                     Log.d(TAG, "Suppressed drawFrame since redraw is not needed "
                             + "and offsets have not changed.");
                 }
                 return;
             }

             if (mBackgroundWidth < 0 || mBackgroundHeight < 0) {
                 // If we don't yet know the size of the wallpaper bitmap,
                 // we need to get it now.
                 updateWallpaperLocked();
             }

             SurfaceHolder sh = getSurfaceHolder();
             final Rect frame = sh.getSurfaceFrame();
             final int dw = frame.width();
             final int dh = frame.height();
             final int availw = dw - mBackgroundWidth;
             final int availh = dh - mBackgroundHeight;
             int xPixels = availw < 0 ? (int)(availw * mXOffset + .5f) : (availw / 2);
             int yPixels = availh < 0 ? (int)(availh * mYOffset + .5f) : (availh / 2);

             mOffsetsChanged = false;
             if (!mRedrawNeeded
                     && xPixels == mLastXTranslation && yPixels == mLastYTranslation) {
                 if (DEBUG) {
                     Log.d(TAG, "Suppressed drawFrame since the image has not "
                             + "actually moved an integral number of pixels.");
                 }
                 return;
             }
             mRedrawNeeded = false;
             mLastXTranslation = xPixels;
             mLastYTranslation = yPixels;

             if (mBackground == null) {
                 // If we somehow got to this point after we have last flushed
                 // the wallpaper, well we really need it to draw again.  So
                 // seems like we need to reload it.  Ouch.
                 updateWallpaperLocked();
             }

             //Slog.i(TAG, "************** DRAWING WALLAPER ******************");
             Canvas c = sh.lockCanvas();
             if (c != null) {
                 try {
                     if (DEBUG) {
                         Log.d(TAG, "Redrawing: xPixels=" + xPixels + ", yPixels=" + yPixels);
                     }

                     c.translate(xPixels, yPixels);
                     if (availw < 0 || availh < 0) {
                         c.save(Canvas.CLIP_SAVE_FLAG);
                         c.clipRect(0, 0, mBackgroundWidth, mBackgroundHeight, Op.DIFFERENCE);
                         c.drawColor(0xff000000);
                         c.restore();
                     }
                     if (mBackground != null) {
                         mBackground.draw(c);
                     }
                 } finally {
                     sh.unlockCanvasAndPost(c);
                 }
             }

             if (FIXED_SIZED_SURFACE) {
                 // If the surface is fixed-size, we should only need to
                 // draw it once and then we'll let the window manager
                 // position it appropriately.  As such, we no longer needed
                 // the loaded bitmap.  Yay!
                 mBackground = null;
                 mWallpaperManager.forgetLoadedWallpaper();
             }
         }

         void updateWallpaperLocked() {
             //Slog.i(TAG, "************** LOADING WALLAPER ******************");
             Throwable exception = null;
             try {
                 mBackground = mWallpaperManager.getFastDrawable();
             } catch (RuntimeException e) {
                 exception = e;
             } catch (OutOfMemoryError e) {
                 exception = e;
             }
             if (exception != null) {
                 mBackground = null;
                 // Note that if we do fail at this, and the default wallpaper can't
                 // be loaded, we will go into a cycle.  Don't do a build where the
                 // default wallpaper can't be loaded.
                 Log.w(TAG, "Unable to load wallpaper!", exception);
                 try {
                     mWallpaperManager.clear();
                 } catch (IOException ex) {
                     // now we're really screwed.
                     Log.w(TAG, "Unable reset to default wallpaper!", ex);
                 }
             }
             mBackgroundWidth = mBackground != null ? mBackground.getIntrinsicWidth() : 0;
             mBackgroundHeight = mBackground != null ? mBackground.getIntrinsicHeight() : 0;
         }
     }
 }
	/*
	* Copyright (C) 2009 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.systemui;

	import java.io.IOException;

	import android.app.WallpaperManager;
	import android.graphics.Canvas;
	import android.graphics.Rect;
	import android.graphics.Region.Op;
	import android.graphics.drawable.Drawable;
	import android.os.Handler;
	import android.service.wallpaper.WallpaperService;
	import android.util.Log;
	import android.util.Slog;
	import android.view.MotionEvent;
	import android.view.SurfaceHolder;
	import android.content.Context;
	import android.content.IntentFilter;
	import android.content.Intent;
	import android.content.BroadcastReceiver;

	/**
	* Default built-in wallpaper that simply shows a static image.
	*/
	public class ImageWallpaper extends WallpaperService {
	private static final String TAG = "ImageWallpaper";
	private static final boolean DEBUG = false;

	static final boolean FIXED_SIZED_SURFACE = true;

	WallpaperManager mWallpaperManager;
	private Handler mHandler;

	@Override
	public void onCreate() {
	super.onCreate();
	mWallpaperManager = (WallpaperManager) getSystemService(WALLPAPER_SERVICE);
	mHandler = new Handler();
	}

	public Engine onCreateEngine() {
	return new DrawableEngine();
	}

	class DrawableEngine extends Engine {
	private final Object mLock = new Object();
	private WallpaperObserver mReceiver;
	Drawable mBackground;
	int mBackgroundWidth = -1, mBackgroundHeight = -1;
	float mXOffset;
	float mYOffset;

	boolean mVisible = true;
	boolean mRedrawNeeded;
	boolean mOffsetsChanged;
	int mLastXTranslation;
	int mLastYTranslation;

	class WallpaperObserver extends BroadcastReceiver {
	public void onReceive(Context context, Intent intent) {
	if (DEBUG) {
	Log.d(TAG, "onReceive");
	}

	synchronized (mLock) {
	mBackgroundWidth = mBackgroundHeight = -1;
	mBackground = null;
	mRedrawNeeded = true;
	drawFrameLocked();
	}
	}
	}

	@Override
	public void onCreate(SurfaceHolder surfaceHolder) {
	if (DEBUG) {
	Log.d(TAG, "onCreate");
	}

	super.onCreate(surfaceHolder);

	// Don't need this currently because the wallpaper service
	// will restart the image wallpaper whenever the image changes.
	//IntentFilter filter = new IntentFilter(Intent.ACTION_WALLPAPER_CHANGED);
	//mReceiver = new WallpaperObserver();
	//registerReceiver(mReceiver, filter, null, mHandler);

	updateSurfaceSize(surfaceHolder);
	}

	@Override
	public void onDestroy() {
	super.onDestroy();
	if (mReceiver != null) {
	unregisterReceiver(mReceiver);
	}
	}

	@Override
	public void onDesiredSizeChanged(int desiredWidth, int desiredHeight) {
	super.onDesiredSizeChanged(desiredWidth, desiredHeight);
	SurfaceHolder surfaceHolder = getSurfaceHolder();
	if (surfaceHolder != null) {
	updateSurfaceSize(surfaceHolder);
	}
	}

	void updateSurfaceSize(SurfaceHolder surfaceHolder) {
	if (FIXED_SIZED_SURFACE) {
	// Used a fixed size surface, because we are special. We can do
	// this because we know the current design of window animations doesn't
	// cause this to break.
	surfaceHolder.setFixedSize(getDesiredMinimumWidth(), getDesiredMinimumHeight());
	} else {
	surfaceHolder.setSizeFromLayout();
	}
	}

	@Override
	public void onVisibilityChanged(boolean visible) {
	if (DEBUG) {
	Log.d(TAG, "onVisibilityChanged: visible=" + visible);
	}

	synchronized (mLock) {
	if (mVisible != visible) {
	if (DEBUG) {
	Log.d(TAG, "Visibility changed to visible=" + visible);
	}
	mVisible = visible;
	drawFrameLocked();
	}
	}
	}

	@Override
	public void onTouchEvent(MotionEvent event) {
	super.onTouchEvent(event);
	}

	@Override
	public void onOffsetsChanged(float xOffset, float yOffset,
	float xOffsetStep, float yOffsetStep,
	int xPixels, int yPixels) {
	if (DEBUG) {
	Log.d(TAG, "onOffsetsChanged: xOffset=" + xOffset + ", yOffset=" + yOffset
	+ ", xOffsetStep=" + xOffsetStep + ", yOffsetStep=" + yOffsetStep
	+ ", xPixels=" + xPixels + ", yPixels=" + yPixels);
	}

	synchronized (mLock) {
	if (mXOffset != xOffset \|\| mYOffset != yOffset) {
	if (DEBUG) {
	Log.d(TAG, "Offsets changed to (" + xOffset + "," + yOffset + ").");
	}
	mXOffset = xOffset;
	mYOffset = yOffset;
	mOffsetsChanged = true;
	}
	drawFrameLocked();
	}
	}

	@Override
	public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
	if (DEBUG) {
	Log.d(TAG, "onSurfaceChanged: width=" + width + ", height=" + height);
	}

	super.onSurfaceChanged(holder, format, width, height);

	synchronized (mLock) {
	mRedrawNeeded = true;
	drawFrameLocked();
	}
	}

	void drawFrameLocked() {
	if (!mVisible) {
	if (DEBUG) {
	Log.d(TAG, "Suppressed drawFrame since wallpaper is not visible.");
	}
	return;
	}
	if (!mRedrawNeeded && !mOffsetsChanged) {
	if (DEBUG) {
	Log.d(TAG, "Suppressed drawFrame since redraw is not needed "
	+ "and offsets have not changed.");
	}
	return;
	}

	if (mBackgroundWidth < 0 \|\| mBackgroundHeight < 0) {
	// If we don't yet know the size of the wallpaper bitmap,
	// we need to get it now.
	updateWallpaperLocked();
	}

	SurfaceHolder sh = getSurfaceHolder();
	final Rect frame = sh.getSurfaceFrame();
	final int dw = frame.width();
	final int dh = frame.height();
	final int availw = dw - mBackgroundWidth;
	final int availh = dh - mBackgroundHeight;
	int xPixels = availw < 0 ? (int)(availw * mXOffset + .5f) : (availw / 2);
	int yPixels = availh < 0 ? (int)(availh * mYOffset + .5f) : (availh / 2);

	mOffsetsChanged = false;
	if (!mRedrawNeeded
	&& xPixels == mLastXTranslation && yPixels == mLastYTranslation) {
	if (DEBUG) {
	Log.d(TAG, "Suppressed drawFrame since the image has not "
	+ "actually moved an integral number of pixels.");
	}
	return;
	}
	mRedrawNeeded = false;
	mLastXTranslation = xPixels;
	mLastYTranslation = yPixels;

	if (mBackground == null) {
	// If we somehow got to this point after we have last flushed
	// the wallpaper, well we really need it to draw again. So
	// seems like we need to reload it. Ouch.
	updateWallpaperLocked();
	}

	//Slog.i(TAG, "************ DRAWING WALLAPER ****************");
	Canvas c = sh.lockCanvas();
	if (c != null) {
	try {
	if (DEBUG) {
	Log.d(TAG, "Redrawing: xPixels=" + xPixels + ", yPixels=" + yPixels);
	}

	c.translate(xPixels, yPixels);
	if (availw < 0 \|\| availh < 0) {
	c.save(Canvas.CLIP_SAVE_FLAG);
	c.clipRect(0, 0, mBackgroundWidth, mBackgroundHeight, Op.DIFFERENCE);
	c.drawColor(0xff000000);
	c.restore();
	}
	if (mBackground != null) {
	mBackground.draw(c);
	}
	} finally {
	sh.unlockCanvasAndPost(c);
	}
	}

	if (FIXED_SIZED_SURFACE) {
	// If the surface is fixed-size, we should only need to
	// draw it once and then we'll let the window manager
	// position it appropriately. As such, we no longer needed
	// the loaded bitmap. Yay!
	mBackground = null;
	mWallpaperManager.forgetLoadedWallpaper();
	}
	}

	void updateWallpaperLocked() {
	//Slog.i(TAG, "************ LOADING WALLAPER ****************");
	Throwable exception = null;
	try {
	mBackground = mWallpaperManager.getFastDrawable();
	} catch (RuntimeException e) {
	exception = e;
	} catch (OutOfMemoryError e) {
	exception = e;
	}
	if (exception != null) {
	mBackground = null;
	// Note that if we do fail at this, and the default wallpaper can't
	// be loaded, we will go into a cycle. Don't do a build where the
	// default wallpaper can't be loaded.
	Log.w(TAG, "Unable to load wallpaper!", exception);
	try {
	mWallpaperManager.clear();
	} catch (IOException ex) {
	// now we're really screwed.
	Log.w(TAG, "Unable reset to default wallpaper!", ex);
	}
	}
	mBackgroundWidth = mBackground != null ? mBackground.getIntrinsicWidth() : 0;
	mBackgroundHeight = mBackground != null ? mBackground.getIntrinsicHeight() : 0;
	}
	}
	}