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Figure 2-65. The Trace Bitmap dialog box The settings aren t all that mysterious: Color threshold: The higher the number, the more colors are considered a match and the fewer the vectors. Set this value to 100. Minimum area: The number entered here defines the smallest size for a vector shape. If you want a really detailed image, use a low number. Just keep in mind that the smaller the number, the more shapes and therefore the larger the file size. In fact, extremely complex vectors can, and often do, carry a greater file size penalty than the bitmap images they re based on. Set this value to 8 pixels. Curve fit: Think of this as being a smoothing setting. Select Pixels, and you get a very accurate trace. Select Very Smooth, and curves really round out. Again, the fewer the curves, the smaller the file size. Corner threshold: This value determines how much a line can bend before Flash breaks it into corners. The fewer the corners, the smaller the file size. (Picking up a theme here )

3. Click the Preview button to see the effect of your choices, as shown in Figure 2-66.

If you have used previous versions of Flash, you will find the Preview button in the Trace Bitmap dialog box a welcome addition to Flash CS5.

NOTE If you want to update the machine.config file, simply copy the <section> element from Listing 5-1 into the machine.config file, under the <configSections> node.

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Going through the process when the finalizer for the pooled object executes, the pooled object will reference the IObjectPool<> instance and reregister itself. In ReturnObject, the method GC.ReRegisterForFinalize is called. When an object is resurrected, the finalizer won t be called again. Calling the method ReRegisterForFinalize will cause the garbage collector to call the finalizer again, even though the object has been resurrected. The trouble with this strategy is that sometimes it isn t desirable to resurrect an object. This occurs when the finalizer of object pool has been called. Then the object reregistration won t happen because the variable _allowRegistrations will be a false value, and the finalizer won t be reregistered. Doing otherwise will result in a never-ending loop of finalizations method calls.

4. Click OK to apply the change and close the dialog box. 5. Now you ll see what happens when you use even closer tolerances. Select the image on the right

of the stage, and open the Trace Bitmap dialog box. Specify these values: Color threshold: 5 Minimum area: 2 Corner threshold: Many corners Curve fit: Pixels

If you prefer not to type these entries manually (and I certainly do not!), then you can use the convenient Configuration Editor that ships with WSE 2.0. This tool provides a tabbed GUI interface in which you specify configuration settings for a project and then automatically apply the settings without having to write the code manually. The tool can be accessed directly from within your Visual Studio .NET project, as shown in Figure 5-3.

6. Click the Preview button. The progress bar will take a bit longer this time, and when it finishes,

Another strategy that could be used that wouldn t require a reregistration flag is the class WeakReference. WeakReference allows one class to reference another class without creating a strong reference to the other class. Without a strong reference, the class can be garbage collected.4 In theory, the pooled object could reference the IObjectPool<> instance using a weak reference, and then in the pooled object s finalizer the weak reference is tested before reregistration. The problem with this strategy is that finalizers are called in any order by the garbage collector. And that could mean that the weak reference finalizer for the pooled object will be called before the finalizer of the pooled object, which would result in an object been returned to memory even though the IObjectPool<> instance still existed. Another solution to the Object Pool pattern is to not implement a finalizer, but use the IDisposable interface as illustrated by the following: class TestPoolAllocation : IDisposable { WeakReference _reference; public TestPoolAllocation( IObjectPoolBase<TestPoolAllocation> parent) { _reference = new WeakReference( parent);; } public void Dispose() { if( _reference.Target != null) { ((IObjectPoolBase<TestPoolAllocation2>)_reference.Target). ReturnObject( this); } } } In the modified example, the class TestPoolAllocation implements the IDisposable method, which uses the WeakReference class. The WeakReference class contains a reference to an IObjectPoolBase<> class instance. In the implementation of the Dispose method, the weak reference is tested for a null value, indicating that the object has been garbage collected. If the Target value isn t null, then the IObjectPoolBase<> instance still exists, and the object can be reregistered for reuse.

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