MEDIA INTEGRATION in VB.NET

Draw QR Code in VB.NET MEDIA INTEGRATION

CHAPTER 4 MEDIA INTEGRATION
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Now you have rendered the thumbnail image and related reflected image. What you need to do is to add them within the StackPanel control, add the stack panel to the thumbsPanel stack panel, and adjust the scroll viewer area (as explained earlier) to display the latest image with its reflection. StackPanel sp = new StackPanel(); sp.Children.Add(thumbImage); sp.Children.Add(reflectedImage); thumbsPanel.Children.Add(sp); The following is a complete code snippet of the sourceVideo_MouseLeftButtonDown event: private void sourceVideo_MouseLeftButtonDown (object sender, MouseButtonEventArgs e) { WriteableBitmap snapShot = new WriteableBitmap(sourceVideo, null); Image thumbImage = new Image(); thumbImage.Height = 90; thumbImage.Margin = new Thickness(2, 0, 2, 0); thumbImage.Source = snapShot; WriteableBitmap reflectedShot = new WriteableBitmap(sourceVideo, imageTransform); Image reflectedImage = new Image(); reflectedImage.Height = 90; reflectedImage.Margin = new Thickness(2, 0, 2, 0); reflectedImage.Source = reflectedShot; reflectedImage.OpacityMask = lnrGradBrush; StackPanel sp = new StackPanel(); sp.Children.Add(thumbImage); sp.Children.Add(reflectedImage); thumbsPanel.Children.Add(sp); scrollArea.UpdateLayout(); double scrollPos = thumbsPanel.ActualWidth; scrollArea.ScrollToHorizontalOffset(scrollPos); } Rebuild and run the project. Now you should be in a position to capture the frame from the playing video as an image and produce the reflection of the image at run time, as shown in Figure 4-3.
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Silverlight Hardware Acceleration
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Silverlight 3 and 4 leverage Graphics Processor Unit (GPU) hardware acceleration to deliver a true highdefinition (HD) media experience in the in-browser and full-screen modes. In Silverlight 1 and 2, media
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CHAPTER 4 MEDIA INTEGRATION
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rendering is performed by software that makes the playback of animations and video files dependent on the capabilities of the CPU of the host PC. This can cause performance issues for complex media files. With Silverlight 3 onwards, we can now fix this performance problem somewhat by taking advantage of hardware GPU acceleration, if enabled, and provide a rich and smooth media experience to users. GPU hardware acceleration allows Silverlight to use the user s video card to render portions of the user interface, which can greatly improve performance. To take advantage of the video hardware, Silverlight uses DirectX for Windows-based and OpenGL for Mac-based devices.
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GPU Hardware Acceleration
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GPU hardware acceleration is a manual opt-in feature on the Silverlight plug-in and thus is disabled by default. To explicitly enable GPU hardware acceleration for an HTML or ASP .NET page hosting a Silverlight plug-in, set the EnableGPUAcceleration parameter at the Silverlight Object tag level to true, as shown in the following code: <object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%"> <param name="EnableGPUAcceleration" value="true" /> </object> That s it. This single line enables GPU hardware acceleration at the Silverlight plug-in level. Now you can take advantage of it in your application to enable bitmap caching at the user interface element level, which is our next topic.
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Note The EnableGPUAcceleration property is a read-only property and cannot be set up through code-behind. It must be set at Silverlight plug-in level within the Silverlight application hosting page.
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Bitmap Caching
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The GPU hardware acceleration enabled Silverlight application can take advantage of the improved rendering performance of applications by caching vector content, text, and controls into bitmaps. Bitmap caching can be a useful and high-performing tactic in scenarios where content needs to scale without changes being made to its internal appearance. Bitmap caching is also a manual opt-in feature, and you need to explicitly enable it at the user interface element level within XAML code. You can enable the bitmap caching by setting the CacheMode attribute of the user interface element (e.g., Grid control) to BitmapCache. If enabled, the caching feature is applicable to that particular element and its children elements (if any). To take advantage of bitmap caching, GPU hardware acceleration must be enabled at the Silverlight plug-in level, as explained in the last section. Once you enable GPU hardware acceleration, the following example shows bitmap caching enabled at the Grid control level.
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