Dynamic Image Generation in Silverlight

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Microsoft news and tips » Dynamic Image Generation in Silverlight — Tue, 22 Apr 2008 04:31:21 GMT

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Générer et modifier une image bitmap en Silverlight 2

Christophe Lauer, Blog Edition — Tue, 22 Apr 2008 10:09:12 GMT

Après un premier billet dans la rubrique "Cookbook Silverlight" qui parlait d'un contrôle

re: Dynamic Image Generation in Silverlight

rob_houweling — Wed, 23 Apr 2008 11:30:26 GMT

Hi Joe,

Great stuff!!

I was wondering though... Is it possible to read the stream of an image using your EditableImage class? Or is this a limitation of SL2 beta 1?

If it was possible, it would create opportunities for image editing/effects.

Kind regards,

Rob Houweling

Silverlight 2: Generate Images on the fly

andyBlog [andy britcliffe] — Wed, 23 Apr 2008 18:56:22 GMT

Joe Stegman has been hard at work making this happen and has now released an initial version of his PNG

A Few New Noteworthy SL Samples

Scott McCraw's Blog — Fri, 25 Apr 2008 03:15:31 GMT

I've been OOF on vacation (Hawaii, where it's warm!).  But I'm back now and here's a few new sample

re: Dynamic Image Generation in Silverlight

planetmarshalluk — Fri, 25 Apr 2008 11:46:17 GMT

Funnily enough I was looking at doing this the other day, you just saved me a lot of work. I've made a couple of modifications, which you may want to consider

* PNGEncoder

* Adler32 algorithm. There are some optimizations you could make here, see the Wikipedia article for details on a C implementation which is straightforward to convert to C#

* Use Array.Copy instead of manual array copies - this is significntly faster

* EditableBitmap

* provide a delegate interface implementing the Visitor pattern as well as SetPixel, or something like WPF's WriteableBitmap.WritePixels(). Writing all the pixels in a single op is significantly faster than repeatedly calling SetPixel()

It should be noted however that writing the pixels is really your bottleneck, so optimizing the Encoder won't make much of a difference.

I'm currently playing with some multithreaded approaches and will let you know what I come up with.

Thanks again,

Andrew.

re: Dynamic Image Generation in Silverlight

planetmarshalluk — Fri, 25 Apr 2008 14:25:17 GMT

You need to take a look at the for loop in PngEncoder.Encode(). The number of iterations in the loop ( ie the number of blocks written ) is equal to pixelwidth/rowsperblock, which is not what you want ( try creating an image 400x300 and you'll see what I mean ).

I would replace the for loop with something like this,

uint nblocks = dcSize / _MAXBLOCK;

uint nbytes = nblocks * _MAXBLOCK;

for ( int offset = 0; offset < nbytes; offset += _MAXBLOCK )

{

comp.WriteByte(0x00);

// write LEN ( length of block )

comp.Write(BitConverter.GetBytes(_MAXBLOCK), 0, 2);

// Write one's compliment of LEN

comp.Write(BitConverter.GetBytes(0), 0, 2);

// Write block

comp.Write(data, offset, _MAXBLOCK);

}

// write last block

comp.WriteByte(0x01);

// write LEN ( length of block )

uint lastBlock = dcSize - nbytes;

comp.Write(BitConverter.GetBytes(lastBlock), 0, 2);

// Write one's compliment of LEN

comp.Write(BitConverter.GetBytes((ushort) ~lastBlock), 0, 2);

// Write block

comp.Write(data, (int) nbytes, (int)lastBlock);

re: Dynamic Image Generation in Silverlight

planetmarshalluk — Fri, 25 Apr 2008 14:33:50 GMT

whoops - need to modify that last bit of code to deal with images that are an exact multiple of MAXBLOCK bytes. The code will still work, but the last block is of zero length in those cases.

D'oh!

re: Dynamic Image Generation in Silverlight

mdonatas — Sun, 27 Apr 2008 17:54:16 GMT

You've done an incredible job! Since PNG encoder was a bit over my head, custom BMP encoder had to suffice. Superb... simply superb! Thanks a bunch :)

On the other hand this comming from you probably means that Silverlight 2.0 final won't have native support for System.Drawing

Updated PNG Generator Sample

Joe Stegman's WebBlog — Mon, 28 Apr 2008 05:06:50 GMT

I fixed a few bugs in the ImageGenerator sample . One was related to non-square images and the other

Performance for displaying image.

ismail codar — Fri, 02 May 2008 12:00:28 GMT

If you setting up height = 500 and width = 500 or greather then in dt_Tick method test screen is can't dislaying.

Especially performance is problem for animations. I hope next silverlight version is native support raster drawing.

Great sample

LarsG — Thu, 22 May 2008 12:30:34 GMT

Thx this inspired me to try to do some animations with it.. doing some old school 2d water ripples..

Lars

Silverlight - Dynamic DeepZoom with MultiScaleImage and MultiScaleTileSource

Mike Taulty's Blog — Wed, 25 Jun 2008 17:28:01 GMT

One of the things that I've been meaning to experiment with around the MultiScaleImage control in Silverlight...

Optimizing Joe Stegman's Dynamic Image Generation in Silverlight (Twice the Speed)

XAML, WPF, Silverlight, .NET, Office 2007, Windows — Thu, 03 Jul 2008 06:05:55 GMT

I needed a good and relatively fast dynamic image generation code for Silverlight (for the next sample,

Reallistic Water Ripples (Rain Drops) in Silverlight

XAML, WPF, Silverlight, .NET, Office 2007, Windows — Thu, 03 Jul 2008 23:31:02 GMT

In this tutorial: - creating and rendering water ripples - optimized image generation - JPEG decoding

Optimized Joe Stegman's Dynamic Image Generation (Twice the Speed)

XAML, WPF, Silverlight, .NET, Office 2007, Windows — Fri, 04 Jul 2008 20:25:44 GMT

I needed a good and relatively fast dynamic image generation code for Silverlight (for the next sample,

Building the Reallistic Water Ripples Sample in Silverlight

XAML, WPF, Silverlight, .NET, Office 2007, Windows — Fri, 04 Jul 2008 20:30:16 GMT

In this tutorial: - creating and rendering water ripples - optimized image generation - JPEG decoding

Silverlight Spectrum Emulator

Community Blogs — Mon, 01 Sep 2008 01:52:19 GMT

So I've just finished version 1.0 of my Silverlight spectrum emulator. At the moment there is no

Minh T. Nguyen's Mandelbrot Explorer 1.0 in Silverlight 2.0 with source code

Minh T. Nguyen's Blog — Wed, 03 Dec 2008 13:19:07 GMT

Minh T. Nguyen 's Mandelbrot Explorer is an application that allows you to zoom into the Mandelbrot set

Pushing Paint applications into Web 2.0 using Silverlight

UK StudentZine Blog — Wed, 22 Apr 2009 15:22:56 GMT

Paint applications on the desktop has been developing for a long time however there are few available

"Software" rendering in Balder

Einar Ingebrigtsen — Tue, 05 May 2009 09:35:45 GMT

"Software" rendering in Balder