Saturday, July 11, 2009

Silverlight 3 WriteableBitmap is unwriteable

So I downloaded Silverlight 3 RTW(the real one, not Silverlight 3 beta) today getting all excited to try out the new stuff offered by Silverlight 3, and found that WritableBitmap does not exactly work like it does in Silverlight 3 beta. The problem? You can’t directly write the pixels, yeah so it’s basically unwritable. Then why not call it UnwriteableBitmap?

Maybe I’m doing something wrong in my code, or maybe there are ways to really write a WritableBitmap in Silverlight 3. I’ve been searching everywhere on the web but all the examples / codes only work in Silverlight 3 beta, and it seems that Silverlight 3 was released so hastily that there is not much documentation provided for this particular class. Well I hope more information will be available soon by Microsoft.

Microsoft does provide a documentation of breaking changes from Silverlight 3 Beta to Silverlight 3 RTW, but all it says are Lock() and Unlock() have been removed and does not say anything about writing Pixel data into WriteableBitmap.

What does WriteableBitmap (supposedly) do?

WritableBitmap lets you manipulate each pixel in a bitmap to generate customizable images. An example image that is generated through Silverlight 3 Beta WriteableBitmap is shown below.

WritableBitmap Does Not Work

If you know how to make WritableBitmap work, please let me know / post comments below. I’m really eager to try this out and use it for my next project. If the WriteableBitmap does work, it will be really useful for visual effects and game design. Right now the search engine is flooded by Silverligth 3 Beta examples that I can’t find any useful resources for the actual Silverlight 3 release.


zuppaman said...

Hey Byron,

I found your blog while searching on the writeable bitmap changes in RTW of SL3.
I fixed my previous writeablebitmap sample.
You can check the sample and code on

Byron Singh said...

Thanks for the info. Now I can go experiment with writeablebitmap yay.

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