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Blur and drop shadow performance varies with the blur radius and the number of pixels it is applied to Since Silverlight takes multiple passes to render a blur, it is more computationally expensive than other custom effects You should use these effects sparingly
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This chapter discussed the following: The Silverlight effects design principles How to use built-in effects and custom effects in your application How the effects system works under the hood
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O S T C O M P U T E R S H AV E a modern graphics processing unit (GPU) that can render graphics faster than a CPU In Silverlight 3, you have the option of using the GPU to improve the performance of transform operations, opacity fades, scrolling, and clip operations For example, full-screen video runs signi cantly faster if you use the GPU to stretch the video If you use the Silverlight GPU features incorrectly, you can cause excessive use of system resources and severe performance degradations It is important that you learn how to use these features optimally to get the most performance benefit This chapter describes the following:
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The design goals of Silverlight GPU acceleration are as follows: Achieve better performance for common scenarios Maintain good image quality during GPU accelerated operations
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Achieve Better Performance for Common Scenarios The GPU is usually capable of higher pixel ll rates than the CPU because of larger memory bandwidth and ef cient parallel computation The GPU also has specialized hardware for some common graphics operations such as the bilinear ltering process described in 3, Graphics With Silverlight GPU acceleration, you can speed up common scenarios like the following:
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Display to the browser window or full-screen window on some operating systems Image and video stretching, especially for full-screen scenarios Transform animations Opacity fades Scrolling Rendering using the GPU can also improve the speed of transferring the rendered results from the Silverlight back buffer to the display
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Maintain Good Image Quality The goal of Silverlight GPU acceleration is to provide better speed while maintaining similar image quality to CPU-based rendering There are situations where there is a direct tradeoff between image quality and speed In these situations, Silverlight provides options for selecting the quality you would like to achieve For example, if you stretch a vector graphic with Silverlight GPU acceleration, it can become blurry Silverlight gives you the option of selecting the resolution you want to render that vector graphic so that stretches can remain sharper You will learn more about these options later in this chapter Maintain Reasonable Stability With GPU accelerated rendering, Silverlight uses more of the functionality of your graphics driver than is normally used by the Web browser End
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users often have uncerti ed drivers, beta drivers, or other drivers that may be unstable The Silverlight runtime disables bad drivers and restricts vendors to increase the stability of GPU acceleration You should keep in mind that even if you ask for GPU acceleration, you might not get GPU acceleration if your end-user does not have a stable graphics driver You can also check the current graphics card vendor, device, and driver version to make your own decisions about whether to use the GPU You can query a property to determine if Silverlight is using the GPU
GPU Acceleration Features
In this section, you will learn the following: The requirements for using GPU acceleration How to enable GPU acceleration on the Silverlight plug-in How to use the CacheMode property to speed up rendering and animation
GPU Acceleration Prerequisites GPU acceleration is only available in some cases On Windows operating systems, it is available when the plug-in is in windowed or full-screen mode On Mac OS X operating systems, it is available only when the plugin is in full-screen mode In terminal server environments, it is only available on some operating systems and terminal server clients In all cases, you need at least DirectX 90c installed for Windows or OpenGL2x for the Mac with a compatible video card that meets the minimum Silverlight runtime requirements The video cards and drivers supported may change Enable GPU Acceleration To enable GPU acceleration, set the EnableGPUA cceleration ag to true in the HTML page hosting your Silverlight plug-in:
<embed type="application/x-silverlight" width="800" height="800"