While writeablebitmap by itself is somewhat sparse in terms of methods, the writeablebitmapex offering provides all kinds of cool extension methods to draw on and manipulate bitmaps in silverlight. The above code will have no problem with wpf but as i said it will not work for windows phone. How to save writeablebitmap image to a gif file using. Rippling reflection effect with silverlight 3s writeablebitmap.
At the time i had to abandon the idea due to the lack of writeable bitmap support. Silverlight and writeablebitmap interact software ltd. Aug 05, 2009 two weeks ago i wrote the silverlight 3 writeablebitmap performance blog post and got some good response on it. Youre invoking an asynchronous method to capture the. Get and put pixel in silverlight 3 with writeablebitmap.
Bill reiss wrote a good blog post about the pixel format of the silverlight 3 writeablebitmap class and included some nice helper methods for the pixel manipulation. Silverlight 4 martin fractals with writeablebitmapex. Below is the converter which i wrote which can help you convert the byte array of the file content to a bitmap so that the silverlight can bind it. Writeablebitmapex writeablebitmap extensions now on. This capability is already used internally by silverlight 3 to cache rendered controls but the possibilities extend much further than performance improvements. There are a number of controls that accept a bitmapsource which all silverlight bitmap classes inherit from but the simplest and most direct approach is to use an image control. This is useful for generating algorithmic content, such as a fractal image, and for data visualization, such as a. In fact the time i first ran into the absence of writeablebitmap in silverlight was when i sat down to write exactly this mandelbrot example as an illustration of how to use silverlights multithreading capabilities. Blitting and blending with silverlights writeablebitmap provided the blit functions. The writeablebitmap class that was added in silverlight 3, allows the direct manipulation of a bitmap and could be used to generate fast procedural images by drawing directly to a bitmap. Can the imageeditor be used to convert a writeablebitmap to a bitmapimage.
Furthermore i will provide ready to use code for jpeg encoding and decoding of the writeablebitmap. Silverlight 2 had no api for creating bitmaps, but writeablebitmap makes creating bitmaps on the fly easy as pie. Converting writeablebitmap to a bitmap for saving to an image. It can even do bitmap manipulation which opens up a whole new range of possibilities by way of dynamic bitmaps generated by code rather than loaded from a uri. Jan 27, 2010 the most important silverlight writeablebitmap gotcha does it losechange colors. Getbitmapcontext load an image from the calling assemblys resources via the relative. Jan, 2020 convert, encode and decode silverlight writeablebitmap data came with the byte array conversion methods and hows how to encode decode a writeablebitmap to jpeg. Nov 10, 2016 i looked for the writeablebitmap class, as thats the heart of that application. I have a feeling i need the asstream extension method on writeablebitmap. Writeablebitmap bitmap graphics silverlight wp7 wp7dev windowsphone wp8 wpdev wpf. When you specify a bitmapimage as the parameter for the writeablebitmap constructor, you must set the createoptions property of the bitmapimage before you use it to construct the writeablebitmap. I am not getting how to do that, i am using the following. Quick and dirty output of writeablebitmap as tga image. Oct 29, 2009 the writeablebitmap class is a nice feature that was added in silverlight 3.
The most important silverlight writeablebitmap gotcha does. Microsoft silverlight will reach end of support after october 2021. Byte array conversion copy writeablebitmap to argb byte array. Calculating shader effects in writeablebitmap fast float computations and more game cutscenes part 1 the sequencer no code yet, just concept improving download time 23x for full screen background. It seems that whenever a writeablebitmap object has been locked, invalidated and unlocked, it is never released even if all references are removed. In silverlight 5, how do i render a drawingsurface to a writeablebitmap. The writeablebitmap class is a nice feature that was added in silverlight 3. I found that i can do that with writeablebitmap but how do i first convert these images to writeablebitmaps. I havent tested it and im writing it from the top of my head. In this clip, youll learn how to create bitmaps one pixel at a time with the writeablebitmap class. Aug 04, 2009 silverlight writeablebitmap setpixel extension method i am in the process of writing two interesting controls at least interesting to me.
Writeablebitmapex writeablebitmap extensions now on codeplex announced this project. Imaging class, i have to use writeablebitmap from system. Barcodewriter on the uwp side of a dependencyservice to get the writeablebitmap, and analyzing the array looks like a valid barcode lots of 0 and 255 numbers in the pixel array, and the data size looks correct as well. Ive been a student of fractal geometry for many years.
The writeablebitmap class is available for all xaml flavors including wpf, windows 10 uwp, windows phone, winrt windows store xaml and silverlight. I have two bitmap images that i would like to merge together. The frame captured is basically a writeablebitmap and the below shown code converts the pixel array of the writeablebitmap to bytes and pumps them out to a file. I already tried using the render method of the writeablebitmap class and the constructor that takes a uielement as a parameter but the bitmap always comes out empty. A very useful feature of silverlight 3 is its ability to render any ui element to a bitmap.
This property stores a 32 bit integer as color value for each pixel of the writeablebitmap. I seem to be able to get the pixel data to the image, but the bounds are off and showing 1 width and height. Rendering text to a writeablebitmap with silverlight 3 s bitmap api submitted by smartyp on mon, 072009 21. For more information, including a complete demonstration and detailed, stepbystep. I have a writeablebitmap that i need to save in a file. Load an image from the calling assemblys resources via the relative path. Jul 24, 2009 therefore many silverlight developers were disappointed that wpfs writeablebitmap wasnt available before silverlight 3. Converting writeablebitmap to a bitmap for saving to an image file. In this video, chris hay shows you how to use the new writeablebitmap feature in silverlight 3 to generate dynamic images in your silverlight application. I thought the answer might be also useful for others.
The reason is that the bitmap might not be downloaded yet. Hi, ive found a memory leak with the writeablebitmap class. Is it possible to save a writeablebitmap to a png file. More fun with silverlight 3s writeablebitmap wintellect. Silverlight 3 writeablebitmap performance having a fast dynamic bitmap generation api at hand is essential for procedural image generation and a lot of computer games. Notice that the writeablebitmap class in silverlight is very different to the same class in wpf. Writeablebitmap bitmap new writeablebitmap 400, 200.
Drawing lines silverlight writeablebitmap extensions ii. This makes it more difficult to use this constructor to load a writeablebitmap. If you drop and image control on a page to display a writeablebitmap all you have to. Ive got a problem using writeablebitmap in silverlight 3. However, i dont see that extension method on my writeablebitmap should asstream be on all writeablebitmaps once. Use the writeablebitmap class to update and render a bitmap on a perframe basis. Mar 23, 2009 another of the exciting new features coming in silverlight 3 is the writeablebitmap class. Oct 29, 2009 ive been writing new code samples and revising existing ones. Rendering text to a writeablebitmap with silverlight 3 s.
For details, see the remarks section of writeablebitmap. The format becomes relevant if you are populating the integer values in the pixels array. Exporting a writeablebitmap as an image file codeproject. The writeablebitmap api is very minimalistic and theres only the raw pixels array for such operations. If this is the case, i would immediately look into using wpf instead of silverlight, can you do this. This also shows you a couple of gotchas and how writeablebitmap is used with the silverlight spectrum emulator.
I thought quakelight uses the writeablebitmap and not a custom stream hack, so i. This is useful for generating algorithmic content, such as a fractal image, and for data visualization, such as a music visualizer. Of course there is the small matter of displaying the bitmap we have just created. The initial pixel values in the dimensioned array are 0, which will render as black if left unaltered. Animating mandelbrot fractals with silverlight 3 writeablebitmap use the new writeablebitmap class in silverlight 3 beta to render an animated zooming mandelbrot set fractal image.
Not unless you want to write your own bmp save logic. Ill cover the following topics in the code samples below. It could be used to generate fast procedural images by drawing directly to a bitmap. You can download a zip containing both binary and source, or you. The writepixels method uses the stride you specify to work out where the pixels in the rectangle are located. Setsource method, which uses a stream as parameter for the bitmap source and could be used to. Working with bitmap images silverlight 4 in action. Ive been writing new code samples and revising existing ones. The following code leaks memory, and will crash the browser. The most important silverlight writeablebitmap gotcha. Everywhere it says that writeablebitmap has methods like lock and unlock and direct access to pixels via indexers but they dont exist in my code. Collection of extension methods for the xaml writeablebitmap.
Writeablebitmap constructor uielement, transform system. Explore the entire telerik portfolio by downloading the ultimate. Some of the scenarios where you might have used a writeablebitmap class in previous xaml frameworks can be accomplished in the windows runtime by using the rendertargetbitmap class instead. And thanks to silverlight 3s writeablebitmap class, i was able to make a dramatic improvement to a sample that i originally wrote for silverlight 2 and before that, for silverlight 1. I have some images which i had the need to change the color of which i was able to do without too much trouble with the following function thanks to the writeablebitmap object. Jan 21, 2010 silverlight 3 introduces the writeablebitmap class and with it, the ability to crop an image programmatically on the client all you need to do is create a new instance of the writablebitmap class as your destination supplying the dimensions in the constructor. In practice you often need to manipulate the data in the array as if it was a bitmap in terms of coordinates and colour values. Convert, encode and decode silverlight writeablebitmap data came with the byte array conversion methods and hows how to encode decode a writeablebitmap to jpeg. The format used by the silverlight writeablebitmap is argb32 premultiplied rgb. The most important silverlight writeablebitmap gotcha does it losechange colors.
I used his two methods, optimized them a bit and packed them into a static class as extension methods of the writeablebitmap. Get and put pixel in silverlight 3 with writeablebitmap submitted by smartyp on wed, 07152009 21. The writeablebitmap class is available for all xaml flavors including windows. In the comments of my silverlight 4 edgecam shots blog post marcb asked me how to convert the writeablebitmap to a byte array to save the snapshot in a database. You may want the layout or perspective to be frozen into the writeablebitmap, in this case, you can alter your visual tree to include a node above it. I could not find out a way to convert bitmaps to writeable bitmap directly so what i did was to write my bitmap in isolated storage and read it again in a stream. Not without using pinvoke to create an image and store it in clipboard search this or the silverlight general forum for links to code. Convert, encode and decode silverlight writeablebitmap data. Once you download and install the tool from the microsoft expression website. Load bitmapimage into writeablebitmap but no method existing.
Silverlight, writeablebitmapex, fractals, martin, orbital, and compositiontarget. Nov 07, 2008 in fact the time i first ran into the absence of writeablebitmap in silverlight was when i sat down to write exactly this mandelbrot example as an illustration of how to use silverlights multithreading capabilities. Silverlight writeablebitmap setpixel extension method. When assigning colors to pixels in your bitmap, use premultiplied colors. This blog post demonstrates how silvelight 3s writeablebitmap can be used to create a usercontrol that renders the content of any other framework element as a reflection with an animated ripple effect. In beta 1, you can create bitmaps from scratch, but you cant yet edit existing bitmapsfor example, bitmaps assigned to xaml images or. Jul 16, 2009 bill reiss wrote a good blog post about the pixel format of the silverlight 3 writeablebitmap class and included some nice helper methods for the pixel manipulation. Hello, in my current project, i needed to watermark a writeablebitmap with a text. Creating a writeablebitmap from a uri source posted on august 14, 2010 by schwammy 6 replies ive seen a few posts describing how to use a uri as a source for a bitmapimage, and then the bitmapimage as the source for the writeablebitmap. Jl bxq download yrk maegi lvtm rhnaeto vresrejn threo drosw. Drawing shapes silverlight writeablebitmap extensions iii brought the shape. With this constructor, you have a way to create a bitmap with just the element, its subtree, and without the offset. Therefore many silverlight developers were disappointed that wpfs writeablebitmap wasnt available before silverlight 3. I am currently working on a simple space strategy game in silverlight ill post a link when its closer to being done.
However, i dont see that extension method on my writeablebitmap should asstream be on all writeablebitmaps once i get asstream, what do i do next. Blitting and blending with silverlight s writeablebitmap provided the blit functions. I need to export a writeablebitmap that i get after cropping an image. Silverlight 4 writeablebitmap to bitmap stack overflow. In addition to displaying images, silverlight includes the powerful ability to create. I already knew it existed in universal apps and it actually has the same name as the classes used in silverlight and wpf.
Ive just spent quite some time trying to do something that seems very simple. How to create a bitmap in memory with the silverlight. Silverlight how to watermark a writeablebitmap with a text. Render a drawingsurface to a writeablebitmap in silverlight 5. As i couldnt find anything i decided to create a small extension method to do so. One of it came from the author of quakelight, julien frelat.
Another of the exciting new features coming in silverlight 3 is the writeablebitmap class. For one of the controls i needed a way to directly set pixels on the writeablebitmap with full support for alpha blending, the result is the following extension method. If bmp to clipboard is possible only for trusted apps, is there a easy way to save bmp to file using save dilog without any additional libraries. Saving bitmaps to isolated storage in silverlight 3.
Once you have a handle on the writeablebitmap, youll turn to silverlights. Perhaps it was a generated image that is used in the application, or maybe it is an externally referenced image that you are loading locally for caching purposes. Saving bitmaps to isolated storage in silverlight 3 there may be times when you wish to save a bitmap image to the users local storage. He contacted and asked me if i had tested his png wrapper technique, which is used in the silverlight port of the famous game quake. The good news silverlight can do dynamic bitmaps with the writeablebitmap object introduced in silverlight 3. If nothing happens, download github desktop and try again. Byte array to bitmapimage converter for windows phone. In fact the time i first ran into the absence of writeablebitmap in silverlight was when i sat down to write exactly this mandelbrot example as an illustration of how to use silverlight s multithreading capabilities. Here is the sample in order to link the bitmapimage into the writeablebitmap object. Silverlight 3 writeablebitmap silverlight media developer.