graphics/java/android/graphics/drawable/BitmapDrawable.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2006 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 android.graphics.drawable;

 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
 import android.graphics.PixelFormat;
 import android.graphics.Rect;
 import android.graphics.Shader;
 import android.graphics.BitmapShader;
 import android.util.AttributeSet;
 import android.util.DisplayMetrics;
 import android.view.Gravity;

 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;

 import java.io.IOException;

 /**
  * A Drawable that wraps a bitmap and can be tiled, stretched, or aligned. You can create a
  * BitmapDrawable from a file path, an input stream, through XML inflation, or from
  * a {@link android.graphics.Bitmap} object.
  * <p>It can be defined in an XML file with the <code>&lt;bitmap></code> element.</p>
  * <p>
  * Also see the {@link android.graphics.Bitmap} class, which handles the management and
  * transformation of raw bitmap graphics, and should be used when drawing to a
  * {@link android.graphics.Canvas}.
  * </p>
  *
  * @attr ref android.R.styleable#BitmapDrawable_src
  * @attr ref android.R.styleable#BitmapDrawable_antialias
  * @attr ref android.R.styleable#BitmapDrawable_filter
  * @attr ref android.R.styleable#BitmapDrawable_dither
  * @attr ref android.R.styleable#BitmapDrawable_gravity
  * @attr ref android.R.styleable#BitmapDrawable_tileMode
  */
 public class BitmapDrawable extends Drawable {

     private static final int DEFAULT_PAINT_FLAGS =
             Paint.FILTER_BITMAP_FLAG | Paint.DITHER_FLAG;
     private BitmapState mBitmapState;
     private Bitmap mBitmap;
     private int mTargetDensity;

     private final Rect mDstRect = new Rect();   // Gravity.apply() sets this

     private boolean mApplyGravity;
     private boolean mRebuildShader;
     private boolean mMutated;

      // These are scaled to match the target density.
     private int mBitmapWidth;
     private int mBitmapHeight;

     /**
      * Create an empty drawable, not dealing with density.
      * @deprecated Use {@link #BitmapDrawable(Resources)} to ensure
      * that the drawable has correctly set its target density.
      */
     @Deprecated
     public BitmapDrawable() {
         mBitmapState = new BitmapState((Bitmap) null);
     }

     /**
      * Create an empty drawable, setting initial target density based on
      * the display metrics of the resources.
      */
     public BitmapDrawable(Resources res) {
         mBitmapState = new BitmapState((Bitmap) null);
         mBitmapState.mTargetDensity = mTargetDensity;
     }

     /**
      * Create drawable from a bitmap, not dealing with density.
      * @deprecated Use {@link #BitmapDrawable(Resources, Bitmap)} to ensure
      * that the drawable has correctly set its target density.
      */
     @Deprecated
     public BitmapDrawable(Bitmap bitmap) {
         this(new BitmapState(bitmap), null);
     }

     /**
      * Create drawable from a bitmap, setting initial target density based on
      * the display metrics of the resources.
      */
     public BitmapDrawable(Resources res, Bitmap bitmap) {
         this(new BitmapState(bitmap), res);
         mBitmapState.mTargetDensity = mTargetDensity;
     }

     /**
      * Create a drawable by opening a given file path and decoding the bitmap.
      * @deprecated Use {@link #BitmapDrawable(Resources, String)} to ensure
      * that the drawable has correctly set its target density.
      */
     @Deprecated
     public BitmapDrawable(String filepath) {
         this(new BitmapState(BitmapFactory.decodeFile(filepath)), null);
         if (mBitmap == null) {
             android.util.Log.w("BitmapDrawable", "BitmapDrawable cannot decode " + filepath);
         }
     }

     /**
      * Create a drawable by opening a given file path and decoding the bitmap.
      */
     public BitmapDrawable(Resources res, String filepath) {
         this(new BitmapState(BitmapFactory.decodeFile(filepath)), null);
         mBitmapState.mTargetDensity = mTargetDensity;
         if (mBitmap == null) {
             android.util.Log.w("BitmapDrawable", "BitmapDrawable cannot decode " + filepath);
         }
     }

     /**
      * Create a drawable by decoding a bitmap from the given input stream.
      * @deprecated Use {@link #BitmapDrawable(Resources, java.io.InputStream)} to ensure
      * that the drawable has correctly set its target density.
      */
     @Deprecated
     public BitmapDrawable(java.io.InputStream is) {
         this(new BitmapState(BitmapFactory.decodeStream(is)), null);
         if (mBitmap == null) {
             android.util.Log.w("BitmapDrawable", "BitmapDrawable cannot decode " + is);
         }
     }

     /**
      * Create a drawable by decoding a bitmap from the given input stream.
      */
     public BitmapDrawable(Resources res, java.io.InputStream is) {
         this(new BitmapState(BitmapFactory.decodeStream(is)), null);
         mBitmapState.mTargetDensity = mTargetDensity;
         if (mBitmap == null) {
             android.util.Log.w("BitmapDrawable", "BitmapDrawable cannot decode " + is);
         }
     }

     public final Paint getPaint() {
         return mBitmapState.mPaint;
     }

     public final Bitmap getBitmap() {
         return mBitmap;
     }

     private void computeBitmapSize() {
         mBitmapWidth = mBitmap.getScaledWidth(mTargetDensity);
         mBitmapHeight = mBitmap.getScaledHeight(mTargetDensity);
     }

     private void setBitmap(Bitmap bitmap) {
         mBitmap = bitmap;
         if (bitmap != null) {
             computeBitmapSize();
         } else {
             mBitmapWidth = mBitmapHeight = -1;
         }
     }

     /**
      * Set the density scale at which this drawable will be rendered. This
      * method assumes the drawable will be rendered at the same density as the
      * specified canvas.
      *
      * @param canvas The Canvas from which the density scale must be obtained.
      *
      * @see android.graphics.Bitmap#setDensity(int)
      * @see android.graphics.Bitmap#getDensity()
      */
     public void setTargetDensity(Canvas canvas) {
         setTargetDensity(canvas.getDensity());
     }

     /**
      * Set the density scale at which this drawable will be rendered.
      *
      * @param metrics The DisplayMetrics indicating the density scale for this drawable.
      *
      * @see android.graphics.Bitmap#setDensity(int)
      * @see android.graphics.Bitmap#getDensity()
      */
     public void setTargetDensity(DisplayMetrics metrics) {
         mTargetDensity = metrics.densityDpi;
         if (mBitmap != null) {
             computeBitmapSize();
         }
     }

     /**
      * Set the density at which this drawable will be rendered.
      *
      * @param density The density scale for this drawable.
      *
      * @see android.graphics.Bitmap#setDensity(int)
      * @see android.graphics.Bitmap#getDensity()
      */
     public void setTargetDensity(int density) {
         mTargetDensity = density == 0 ? DisplayMetrics.DENSITY_DEFAULT : density;
         if (mBitmap != null) {
             computeBitmapSize();
         }
     }

     /** Get the gravity used to position/stretch the bitmap within its bounds.
      * See android.view.Gravity
      * @return the gravity applied to the bitmap
      */
     public int getGravity() {
         return mBitmapState.mGravity;
     }

     /** Set the gravity used to position/stretch the bitmap within its bounds.
         See android.view.Gravity
      * @param gravity the gravity
      */
     public void setGravity(int gravity) {
         mBitmapState.mGravity = gravity;
         mApplyGravity = true;
     }

     public void setAntiAlias(boolean aa) {
         mBitmapState.mPaint.setAntiAlias(aa);
     }

     @Override
     public void setFilterBitmap(boolean filter) {
         mBitmapState.mPaint.setFilterBitmap(filter);
     }

     @Override
     public void setDither(boolean dither) {
         mBitmapState.mPaint.setDither(dither);
     }

     public Shader.TileMode getTileModeX() {
         return mBitmapState.mTileModeX;
     }

     public Shader.TileMode getTileModeY() {
         return mBitmapState.mTileModeY;
     }

     public void setTileModeX(Shader.TileMode mode) {
         setTileModeXY(mode, mBitmapState.mTileModeY);
     }

     public final void setTileModeY(Shader.TileMode mode) {
         setTileModeXY(mBitmapState.mTileModeX, mode);
     }

     public void setTileModeXY(Shader.TileMode xmode, Shader.TileMode ymode) {
         final BitmapState state = mBitmapState;
         if (state.mPaint.getShader() == null ||
                 state.mTileModeX != xmode || state.mTileModeY != ymode) {
             state.mTileModeX = xmode;
             state.mTileModeY = ymode;
             mRebuildShader = true;
         }
     }

     @Override
     public int getChangingConfigurations() {
         return super.getChangingConfigurations() | mBitmapState.mChangingConfigurations;
     }

     @Override
     protected void onBoundsChange(Rect bounds) {
         super.onBoundsChange(bounds);
         mApplyGravity = true;
     }

     @Override
     public void draw(Canvas canvas) {
         Bitmap bitmap = mBitmap;
         if (bitmap != null) {
             final BitmapState state = mBitmapState;
             if (mRebuildShader) {
                 Shader.TileMode tmx = state.mTileModeX;
                 Shader.TileMode tmy = state.mTileModeY;

                 if (tmx == null && tmy == null) {
                     state.mPaint.setShader(null);
                 } else {
                     Shader s = new BitmapShader(bitmap,
                             tmx == null ? Shader.TileMode.CLAMP : tmx,
                             tmy == null ? Shader.TileMode.CLAMP : tmy);
                     state.mPaint.setShader(s);
                 }
                 mRebuildShader = false;
                 copyBounds(mDstRect);
             }

             Shader shader = state.mPaint.getShader();
             if (shader == null) {
                 if (mApplyGravity) {
                     Gravity.apply(state.mGravity, mBitmapWidth, mBitmapHeight,
                             getBounds(), mDstRect);
                     mApplyGravity = false;
                 }
                 canvas.drawBitmap(bitmap, null, mDstRect, state.mPaint);
             } else {
                 if (mApplyGravity) {
                     mDstRect.set(getBounds());
                     mApplyGravity = false;
                 }
                 canvas.drawRect(mDstRect, state.mPaint);
             }
         }
     }

     @Override
     public void setAlpha(int alpha) {
         mBitmapState.mPaint.setAlpha(alpha);
     }

     @Override
     public void setColorFilter(ColorFilter cf) {
         mBitmapState.mPaint.setColorFilter(cf);
     }

     /**
      * A mutable BitmapDrawable still shares its Bitmap with any other Drawable
      * that comes from the same resource.
      *
      * @return This drawable.
      */
     @Override
     public Drawable mutate() {
         if (!mMutated && super.mutate() == this) {
             mBitmapState = new BitmapState(mBitmapState);
             mMutated = true;
         }
         return this;
     }

     @Override
     public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs)
             throws XmlPullParserException, IOException {
         super.inflate(r, parser, attrs);

         TypedArray a = r.obtainAttributes(attrs, com.android.internal.R.styleable.BitmapDrawable);

         final int id = a.getResourceId(com.android.internal.R.styleable.BitmapDrawable_src, 0);
         if (id == 0) {
             throw new XmlPullParserException(parser.getPositionDescription() +
                     ": <bitmap> requires a valid src attribute");
         }
         final Bitmap bitmap = BitmapFactory.decodeResource(r, id);
         if (bitmap == null) {
             throw new XmlPullParserException(parser.getPositionDescription() +
                     ": <bitmap> requires a valid src attribute");
         }
         mBitmapState.mBitmap = bitmap;
         setBitmap(bitmap);
         setTargetDensity(r.getDisplayMetrics());

         final Paint paint = mBitmapState.mPaint;
         paint.setAntiAlias(a.getBoolean(com.android.internal.R.styleable.BitmapDrawable_antialias,
                 paint.isAntiAlias()));
         paint.setFilterBitmap(a.getBoolean(com.android.internal.R.styleable.BitmapDrawable_filter,
                 paint.isFilterBitmap()));
         paint.setDither(a.getBoolean(com.android.internal.R.styleable.BitmapDrawable_dither,
                 paint.isDither()));
         setGravity(a.getInt(com.android.internal.R.styleable.BitmapDrawable_gravity, Gravity.FILL));
         int tileMode = a.getInt(com.android.internal.R.styleable.BitmapDrawable_tileMode, -1);
         if (tileMode != -1) {
             switch (tileMode) {
                 case 0:
                     setTileModeXY(Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
                     break;
                 case 1:
                     setTileModeXY(Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
                     break;
                 case 2:
                     setTileModeXY(Shader.TileMode.MIRROR, Shader.TileMode.MIRROR);
                     break;
             }
         }

         a.recycle();
     }

     @Override
     public int getIntrinsicWidth() {
         return mBitmapWidth;
     }

     @Override
     public int getIntrinsicHeight() {
         return mBitmapHeight;
     }

     @Override
     public int getOpacity() {
         if (mBitmapState.mGravity != Gravity.FILL) {
             return PixelFormat.TRANSLUCENT;
         }
         Bitmap bm = mBitmap;
         return (bm == null || bm.hasAlpha() || mBitmapState.mPaint.getAlpha() < 255) ?
                 PixelFormat.TRANSLUCENT : PixelFormat.OPAQUE;
     }

     @Override
     public final ConstantState getConstantState() {
         mBitmapState.mChangingConfigurations = super.getChangingConfigurations();
         return mBitmapState;
     }

     final static class BitmapState extends ConstantState {
         Bitmap mBitmap;
         int mChangingConfigurations;
         int mGravity = Gravity.FILL;
         Paint mPaint = new Paint(DEFAULT_PAINT_FLAGS);
         Shader.TileMode mTileModeX;
         Shader.TileMode mTileModeY;
         int mTargetDensity = DisplayMetrics.DENSITY_DEFAULT;

         BitmapState(Bitmap bitmap) {
             mBitmap = bitmap;
         }

         BitmapState(BitmapState bitmapState) {
             this(bitmapState.mBitmap);
             mChangingConfigurations = bitmapState.mChangingConfigurations;
             mGravity = bitmapState.mGravity;
             mTileModeX = bitmapState.mTileModeX;
             mTileModeY = bitmapState.mTileModeY;
             mTargetDensity = bitmapState.mTargetDensity;
             mPaint = new Paint(bitmapState.mPaint);
         }

         @Override
         public Drawable newDrawable() {
             return new BitmapDrawable(this, null);
         }

         @Override
         public Drawable newDrawable(Resources res) {
             return new BitmapDrawable(this, res);
         }

         @Override
         public int getChangingConfigurations() {
             return mChangingConfigurations;
         }
     }

     private BitmapDrawable(BitmapState state, Resources res) {
         mBitmapState = state;
         if (res != null) {
             mTargetDensity = res.getDisplayMetrics().densityDpi;
         } else if (state != null) {
             mTargetDensity = state.mTargetDensity;
         } else {
             mTargetDensity = DisplayMetrics.DENSITY_DEFAULT;
         }
         setBitmap(state.mBitmap);
     }
 }
	/*
	* Copyright (C) 2006 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 android.graphics.drawable;

	import android.content.res.Resources;
	import android.content.res.TypedArray;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.graphics.Canvas;
	import android.graphics.ColorFilter;
	import android.graphics.Paint;
	import android.graphics.PixelFormat;
	import android.graphics.Rect;
	import android.graphics.Shader;
	import android.graphics.BitmapShader;
	import android.util.AttributeSet;
	import android.util.DisplayMetrics;
	import android.view.Gravity;

	import org.xmlpull.v1.XmlPullParser;
	import org.xmlpull.v1.XmlPullParserException;

	import java.io.IOException;

	/**
	* A Drawable that wraps a bitmap and can be tiled, stretched, or aligned. You can create a
	* BitmapDrawable from a file path, an input stream, through XML inflation, or from
	* a {@link android.graphics.Bitmap} object.
	* <p>It can be defined in an XML file with the <code><bitmap></code> element.</p>
	* <p>
	* Also see the {@link android.graphics.Bitmap} class, which handles the management and
	* transformation of raw bitmap graphics, and should be used when drawing to a
	* {@link android.graphics.Canvas}.
	* </p>
	*
	* @attr ref android.R.styleable#BitmapDrawable_src
	* @attr ref android.R.styleable#BitmapDrawable_antialias
	* @attr ref android.R.styleable#BitmapDrawable_filter
	* @attr ref android.R.styleable#BitmapDrawable_dither
	* @attr ref android.R.styleable#BitmapDrawable_gravity
	* @attr ref android.R.styleable#BitmapDrawable_tileMode
	*/
	public class BitmapDrawable extends Drawable {

	private static final int DEFAULT_PAINT_FLAGS =
	Paint.FILTER_BITMAP_FLAG \| Paint.DITHER_FLAG;
	private BitmapState mBitmapState;
	private Bitmap mBitmap;
	private int mTargetDensity;

	private final Rect mDstRect = new Rect(); // Gravity.apply() sets this

	private boolean mApplyGravity;
	private boolean mRebuildShader;
	private boolean mMutated;

	// These are scaled to match the target density.
	private int mBitmapWidth;
	private int mBitmapHeight;

	/**
	* Create an empty drawable, not dealing with density.
	* @deprecated Use {@link #BitmapDrawable(Resources)} to ensure
	* that the drawable has correctly set its target density.
	*/
	@Deprecated
	public BitmapDrawable() {
	mBitmapState = new BitmapState((Bitmap) null);
	}

	/**
	* Create an empty drawable, setting initial target density based on
	* the display metrics of the resources.
	*/
	public BitmapDrawable(Resources res) {
	mBitmapState = new BitmapState((Bitmap) null);
	mBitmapState.mTargetDensity = mTargetDensity;
	}

	/**
	* Create drawable from a bitmap, not dealing with density.
	* @deprecated Use {@link #BitmapDrawable(Resources, Bitmap)} to ensure
	* that the drawable has correctly set its target density.
	*/
	@Deprecated
	public BitmapDrawable(Bitmap bitmap) {
	this(new BitmapState(bitmap), null);
	}

	/**
	* Create drawable from a bitmap, setting initial target density based on
	* the display metrics of the resources.
	*/
	public BitmapDrawable(Resources res, Bitmap bitmap) {
	this(new BitmapState(bitmap), res);
	mBitmapState.mTargetDensity = mTargetDensity;
	}

	/**
	* Create a drawable by opening a given file path and decoding the bitmap.
	* @deprecated Use {@link #BitmapDrawable(Resources, String)} to ensure
	* that the drawable has correctly set its target density.
	*/
	@Deprecated
	public BitmapDrawable(String filepath) {
	this(new BitmapState(BitmapFactory.decodeFile(filepath)), null);
	if (mBitmap == null) {
	android.util.Log.w("BitmapDrawable", "BitmapDrawable cannot decode " + filepath);
	}
	}

	/**
	* Create a drawable by opening a given file path and decoding the bitmap.
	*/
	public BitmapDrawable(Resources res, String filepath) {
	this(new BitmapState(BitmapFactory.decodeFile(filepath)), null);
	mBitmapState.mTargetDensity = mTargetDensity;
	if (mBitmap == null) {
	android.util.Log.w("BitmapDrawable", "BitmapDrawable cannot decode " + filepath);
	}
	}

	/**
	* Create a drawable by decoding a bitmap from the given input stream.
	* @deprecated Use {@link #BitmapDrawable(Resources, java.io.InputStream)} to ensure
	* that the drawable has correctly set its target density.
	*/
	@Deprecated
	public BitmapDrawable(java.io.InputStream is) {
	this(new BitmapState(BitmapFactory.decodeStream(is)), null);
	if (mBitmap == null) {
	android.util.Log.w("BitmapDrawable", "BitmapDrawable cannot decode " + is);
	}
	}

	/**
	* Create a drawable by decoding a bitmap from the given input stream.
	*/
	public BitmapDrawable(Resources res, java.io.InputStream is) {
	this(new BitmapState(BitmapFactory.decodeStream(is)), null);
	mBitmapState.mTargetDensity = mTargetDensity;
	if (mBitmap == null) {
	android.util.Log.w("BitmapDrawable", "BitmapDrawable cannot decode " + is);
	}
	}

	public final Paint getPaint() {
	return mBitmapState.mPaint;
	}

	public final Bitmap getBitmap() {
	return mBitmap;
	}

	private void computeBitmapSize() {
	mBitmapWidth = mBitmap.getScaledWidth(mTargetDensity);
	mBitmapHeight = mBitmap.getScaledHeight(mTargetDensity);
	}

	private void setBitmap(Bitmap bitmap) {
	mBitmap = bitmap;
	if (bitmap != null) {
	computeBitmapSize();
	} else {
	mBitmapWidth = mBitmapHeight = -1;
	}
	}

	/**
	* Set the density scale at which this drawable will be rendered. This
	* method assumes the drawable will be rendered at the same density as the
	* specified canvas.
	*
	* @param canvas The Canvas from which the density scale must be obtained.
	*
	* @see android.graphics.Bitmap#setDensity(int)
	* @see android.graphics.Bitmap#getDensity()
	*/
	public void setTargetDensity(Canvas canvas) {
	setTargetDensity(canvas.getDensity());
	}

	/**
	* Set the density scale at which this drawable will be rendered.
	*
	* @param metrics The DisplayMetrics indicating the density scale for this drawable.
	*
	* @see android.graphics.Bitmap#setDensity(int)
	* @see android.graphics.Bitmap#getDensity()
	*/
	public void setTargetDensity(DisplayMetrics metrics) {
	mTargetDensity = metrics.densityDpi;
	if (mBitmap != null) {
	computeBitmapSize();
	}
	}

	/**
	* Set the density at which this drawable will be rendered.
	*
	* @param density The density scale for this drawable.
	*
	* @see android.graphics.Bitmap#setDensity(int)
	* @see android.graphics.Bitmap#getDensity()
	*/
	public void setTargetDensity(int density) {
	mTargetDensity = density == 0 ? DisplayMetrics.DENSITY_DEFAULT : density;
	if (mBitmap != null) {
	computeBitmapSize();
	}
	}

	/** Get the gravity used to position/stretch the bitmap within its bounds.
	* See android.view.Gravity
	* @return the gravity applied to the bitmap
	*/
	public int getGravity() {
	return mBitmapState.mGravity;
	}

	/** Set the gravity used to position/stretch the bitmap within its bounds.
	See android.view.Gravity
	* @param gravity the gravity
	*/
	public void setGravity(int gravity) {
	mBitmapState.mGravity = gravity;
	mApplyGravity = true;
	}

	public void setAntiAlias(boolean aa) {
	mBitmapState.mPaint.setAntiAlias(aa);
	}

	@Override
	public void setFilterBitmap(boolean filter) {
	mBitmapState.mPaint.setFilterBitmap(filter);
	}

	@Override
	public void setDither(boolean dither) {
	mBitmapState.mPaint.setDither(dither);
	}

	public Shader.TileMode getTileModeX() {
	return mBitmapState.mTileModeX;
	}

	public Shader.TileMode getTileModeY() {
	return mBitmapState.mTileModeY;
	}

	public void setTileModeX(Shader.TileMode mode) {
	setTileModeXY(mode, mBitmapState.mTileModeY);
	}

	public final void setTileModeY(Shader.TileMode mode) {
	setTileModeXY(mBitmapState.mTileModeX, mode);
	}

	public void setTileModeXY(Shader.TileMode xmode, Shader.TileMode ymode) {
	final BitmapState state = mBitmapState;
	if (state.mPaint.getShader() == null \|\|
	state.mTileModeX != xmode \|\| state.mTileModeY != ymode) {
	state.mTileModeX = xmode;
	state.mTileModeY = ymode;
	mRebuildShader = true;
	}
	}

	@Override
	public int getChangingConfigurations() {
	return super.getChangingConfigurations() \| mBitmapState.mChangingConfigurations;
	}

	@Override
	protected void onBoundsChange(Rect bounds) {
	super.onBoundsChange(bounds);
	mApplyGravity = true;
	}

	@Override
	public void draw(Canvas canvas) {
	Bitmap bitmap = mBitmap;
	if (bitmap != null) {
	final BitmapState state = mBitmapState;
	if (mRebuildShader) {
	Shader.TileMode tmx = state.mTileModeX;
	Shader.TileMode tmy = state.mTileModeY;

	if (tmx == null && tmy == null) {
	state.mPaint.setShader(null);
	} else {
	Shader s = new BitmapShader(bitmap,
	tmx == null ? Shader.TileMode.CLAMP : tmx,
	tmy == null ? Shader.TileMode.CLAMP : tmy);
	state.mPaint.setShader(s);
	}
	mRebuildShader = false;
	copyBounds(mDstRect);
	}

	Shader shader = state.mPaint.getShader();
	if (shader == null) {
	if (mApplyGravity) {
	Gravity.apply(state.mGravity, mBitmapWidth, mBitmapHeight,
	getBounds(), mDstRect);
	mApplyGravity = false;
	}
	canvas.drawBitmap(bitmap, null, mDstRect, state.mPaint);
	} else {
	if (mApplyGravity) {
	mDstRect.set(getBounds());
	mApplyGravity = false;
	}
	canvas.drawRect(mDstRect, state.mPaint);
	}
	}
	}

	@Override
	public void setAlpha(int alpha) {
	mBitmapState.mPaint.setAlpha(alpha);
	}

	@Override
	public void setColorFilter(ColorFilter cf) {
	mBitmapState.mPaint.setColorFilter(cf);
	}

	/**
	* A mutable BitmapDrawable still shares its Bitmap with any other Drawable
	* that comes from the same resource.
	*
	* @return This drawable.
	*/
	@Override
	public Drawable mutate() {
	if (!mMutated && super.mutate() == this) {
	mBitmapState = new BitmapState(mBitmapState);
	mMutated = true;
	}
	return this;
	}

	@Override
	public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs)
	throws XmlPullParserException, IOException {
	super.inflate(r, parser, attrs);

	TypedArray a = r.obtainAttributes(attrs, com.android.internal.R.styleable.BitmapDrawable);

	final int id = a.getResourceId(com.android.internal.R.styleable.BitmapDrawable_src, 0);
	if (id == 0) {
	throw new XmlPullParserException(parser.getPositionDescription() +
	": <bitmap> requires a valid src attribute");
	}
	final Bitmap bitmap = BitmapFactory.decodeResource(r, id);
	if (bitmap == null) {
	throw new XmlPullParserException(parser.getPositionDescription() +
	": <bitmap> requires a valid src attribute");
	}
	mBitmapState.mBitmap = bitmap;
	setBitmap(bitmap);
	setTargetDensity(r.getDisplayMetrics());

	final Paint paint = mBitmapState.mPaint;
	paint.setAntiAlias(a.getBoolean(com.android.internal.R.styleable.BitmapDrawable_antialias,
	paint.isAntiAlias()));
	paint.setFilterBitmap(a.getBoolean(com.android.internal.R.styleable.BitmapDrawable_filter,
	paint.isFilterBitmap()));
	paint.setDither(a.getBoolean(com.android.internal.R.styleable.BitmapDrawable_dither,
	paint.isDither()));
	setGravity(a.getInt(com.android.internal.R.styleable.BitmapDrawable_gravity, Gravity.FILL));
	int tileMode = a.getInt(com.android.internal.R.styleable.BitmapDrawable_tileMode, -1);
	if (tileMode != -1) {
	switch (tileMode) {
	case 0:
	setTileModeXY(Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
	break;
	case 1:
	setTileModeXY(Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
	break;
	case 2:
	setTileModeXY(Shader.TileMode.MIRROR, Shader.TileMode.MIRROR);
	break;
	}
	}

	a.recycle();
	}

	@Override
	public int getIntrinsicWidth() {
	return mBitmapWidth;
	}

	@Override
	public int getIntrinsicHeight() {
	return mBitmapHeight;
	}

	@Override
	public int getOpacity() {
	if (mBitmapState.mGravity != Gravity.FILL) {
	return PixelFormat.TRANSLUCENT;
	}
	Bitmap bm = mBitmap;
	return (bm == null \|\| bm.hasAlpha() \|\| mBitmapState.mPaint.getAlpha() < 255) ?
	PixelFormat.TRANSLUCENT : PixelFormat.OPAQUE;
	}

	@Override
	public final ConstantState getConstantState() {
	mBitmapState.mChangingConfigurations = super.getChangingConfigurations();
	return mBitmapState;
	}

	final static class BitmapState extends ConstantState {
	Bitmap mBitmap;
	int mChangingConfigurations;
	int mGravity = Gravity.FILL;
	Paint mPaint = new Paint(DEFAULT_PAINT_FLAGS);
	Shader.TileMode mTileModeX;
	Shader.TileMode mTileModeY;
	int mTargetDensity = DisplayMetrics.DENSITY_DEFAULT;

	BitmapState(Bitmap bitmap) {
	mBitmap = bitmap;
	}

	BitmapState(BitmapState bitmapState) {
	this(bitmapState.mBitmap);
	mChangingConfigurations = bitmapState.mChangingConfigurations;
	mGravity = bitmapState.mGravity;
	mTileModeX = bitmapState.mTileModeX;
	mTileModeY = bitmapState.mTileModeY;
	mTargetDensity = bitmapState.mTargetDensity;
	mPaint = new Paint(bitmapState.mPaint);
	}

	@Override
	public Drawable newDrawable() {
	return new BitmapDrawable(this, null);
	}

	@Override
	public Drawable newDrawable(Resources res) {
	return new BitmapDrawable(this, res);
	}

	@Override
	public int getChangingConfigurations() {
	return mChangingConfigurations;
	}
	}

	private BitmapDrawable(BitmapState state, Resources res) {
	mBitmapState = state;
	if (res != null) {
	mTargetDensity = res.getDisplayMetrics().densityDpi;
	} else if (state != null) {
	mTargetDensity = state.mTargetDensity;
	} else {
	mTargetDensity = DisplayMetrics.DENSITY_DEFAULT;
	}
	setBitmap(state.mBitmap);
	}
	}