Program: 24340
Project: 24340
Buggy source:
/** 
 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> <p>If you call   {@link #buildDrawingCache()} manually without calling{@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you should cleanup the cache by calling   {@link #destroyDrawingCache()} afterwards.</p>
 * @see #getDrawingCache()
 * @see #destroyDrawingCache()
 */
public void buildDrawingCache(){
  if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mDrawingCache == null || mDrawingCache.get() == null) {
    if (ViewDebug.TRACE_HIERARCHY) {
      ViewDebug.trace(this,ViewDebug.HierarchyTraceType.BUILD_CACHE);
    }
    if (ViewRoot.PROFILE_DRAWING) {
      EventLog.writeEvent(60002,hashCode());
    }
    final int width=mRight - mLeft;
    final int height=mBottom - mTop;
    final int drawingCacheBackgroundColor=mDrawingCacheBackgroundColor;
    final boolean opaque=drawingCacheBackgroundColor != 0 || (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE);
    if (width <= 0 || height <= 0 || (width * height * (opaque ? 2 : 4) >= ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) {
      destroyDrawingCache();
      return;
    }
    boolean clear=true;
    Bitmap bitmap=mDrawingCache == null ? null : mDrawingCache.get();
    if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) {
      Bitmap.Config quality;
      if (!opaque) {
switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) {
case DRAWING_CACHE_QUALITY_AUTO:
          quality=Bitmap.Config.ARGB_8888;
        break;
case DRAWING_CACHE_QUALITY_LOW:
      quality=Bitmap.Config.ARGB_4444;
    break;
case DRAWING_CACHE_QUALITY_HIGH:
  quality=Bitmap.Config.ARGB_8888;
break;
default :
quality=Bitmap.Config.ARGB_8888;
break;
}
}
 else {
quality=Bitmap.Config.RGB_565;
}
if (bitmap != null) bitmap.recycle();
try {
bitmap=Bitmap.createBitmap(width,height,quality);
mDrawingCache=new SoftReference<Bitmap>(bitmap);
}
 catch (OutOfMemoryError e) {
mDrawingCache=null;
return;
}
clear=drawingCacheBackgroundColor != 0;
}
Canvas canvas;
final AttachInfo attachInfo=mAttachInfo;
if (attachInfo != null) {
canvas=attachInfo.mCanvas;
if (canvas == null) {
canvas=new Canvas();
}
canvas.setBitmap(bitmap);
attachInfo.mCanvas=null;
}
 else {
canvas=new Canvas(bitmap);
}
if (clear) {
bitmap.eraseColor(drawingCacheBackgroundColor);
}
computeScroll();
final int restoreCount=canvas.save();
canvas.translate(-mScrollX,-mScrollY);
mPrivateFlags|=DRAWN;
if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {
if (ViewDebug.TRACE_HIERARCHY) {
ViewDebug.trace(this,ViewDebug.HierarchyTraceType.DRAW);
}
dispatchDraw(canvas);
}
 else {
draw(canvas);
}
canvas.restoreToCount(restoreCount);
if (attachInfo != null) {
attachInfo.mCanvas=canvas;
}
mPrivateFlags|=DRAWING_CACHE_VALID;
}
}

Fixed version (ground truth):
/** 
 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> <p>If you call   {@link #buildDrawingCache()} manually without calling{@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you should cleanup the cache by calling   {@link #destroyDrawingCache()} afterwards.</p>
 * @see #getDrawingCache()
 * @see #destroyDrawingCache()
 */
public void buildDrawingCache(){
  if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mDrawingCache == null || mDrawingCache.get() == null) {
    if (ViewDebug.TRACE_HIERARCHY) {
      ViewDebug.trace(this,ViewDebug.HierarchyTraceType.BUILD_CACHE);
    }
    if (ViewRoot.PROFILE_DRAWING) {
      EventLog.writeEvent(60002,hashCode());
    }
    final int width=mRight - mLeft;
    final int height=mBottom - mTop;
    final int drawingCacheBackgroundColor=mDrawingCacheBackgroundColor;
    final boolean opaque=drawingCacheBackgroundColor != 0 || (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE);
    if (width <= 0 || height <= 0 || (width * height * (opaque ? 2 : 4) > ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) {
      destroyDrawingCache();
      return;
    }
    boolean clear=true;
    Bitmap bitmap=mDrawingCache == null ? null : mDrawingCache.get();
    if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) {
      Bitmap.Config quality;
      if (!opaque) {
switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) {
case DRAWING_CACHE_QUALITY_AUTO:
          quality=Bitmap.Config.ARGB_8888;
        break;
case DRAWING_CACHE_QUALITY_LOW:
      quality=Bitmap.Config.ARGB_4444;
    break;
case DRAWING_CACHE_QUALITY_HIGH:
  quality=Bitmap.Config.ARGB_8888;
break;
default :
quality=Bitmap.Config.ARGB_8888;
break;
}
}
 else {
quality=Bitmap.Config.RGB_565;
}
if (bitmap != null) bitmap.recycle();
try {
bitmap=Bitmap.createBitmap(width,height,quality);
mDrawingCache=new SoftReference<Bitmap>(bitmap);
}
 catch (OutOfMemoryError e) {
mDrawingCache=null;
return;
}
clear=drawingCacheBackgroundColor != 0;
}
Canvas canvas;
final AttachInfo attachInfo=mAttachInfo;
if (attachInfo != null) {
canvas=attachInfo.mCanvas;
if (canvas == null) {
canvas=new Canvas();
}
canvas.setBitmap(bitmap);
attachInfo.mCanvas=null;
}
 else {
canvas=new Canvas(bitmap);
}
if (clear) {
bitmap.eraseColor(drawingCacheBackgroundColor);
}
computeScroll();
final int restoreCount=canvas.save();
canvas.translate(-mScrollX,-mScrollY);
mPrivateFlags|=DRAWN;
if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {
if (ViewDebug.TRACE_HIERARCHY) {
ViewDebug.trace(this,ViewDebug.HierarchyTraceType.DRAW);
}
dispatchDraw(canvas);
}
 else {
draw(canvas);
}
canvas.restoreToCount(restoreCount);
if (attachInfo != null) {
attachInfo.mCanvas=canvas;
}
mPrivateFlags|=DRAWING_CACHE_VALID;
}
}