Getting a DrawingContext for a wpf WriteableBitmap

Question

Is there a way to get a DrawingContext (or something similar) for a WriteableBitmap? I.e. something to allow you to call simple DrawLine/DrawRectangle/etc kinds of methods, rather than manipulate the raw pixels directly.

Cowitch

Answer 1

It appears the word is no.

---

For future reference, we plan to use a port of the Writeable Bitmap Extensions for WPF.

For a solution using purely existing code, any of the other suggestions mentioned below will work.

Cowitch

That's no official word. That's just some guy saying something on a forum. – Hirsch

Point taken; updated text. I suppose you could say it meant "official" as in "posted to a forum monitored by officials, and not corrected by them", but that is a bit of a stretch :) – Cowitch

Answer 2

I found sixlettervariables' solution the most workable one. However, there's a "drawingContext.Close()" missing. According to MSDN, "A DrawingContext must be closed before its content can be rendered". The result is the following utility function:

public static BitmapSource CreateBitmap(
    int width, int height, double dpi, Action<DrawingContext> render)
{
    DrawingVisual drawingVisual = new DrawingVisual();
    using (DrawingContext drawingContext = drawingVisual.RenderOpen())
    {
        render(drawingContext);
    }
    RenderTargetBitmap bitmap = new RenderTargetBitmap(
        width, height, dpi, dpi, PixelFormats.Default);
    bitmap.Render(drawingVisual);

    return bitmap;
}

This can then easily be used like this:

BitmapSource image = ImageTools.CreateBitmap(
    320, 240, 96,
    drawingContext =>
    {
        drawingContext.DrawRectangle(
            Brushes.Green, null, new Rect(50, 50, 200, 100));
        drawingContext.DrawLine(
            new Pen(Brushes.White, 2), new Point(0, 0), new Point(320, 240));
    });

Route

The .Close() is implicit in the .Dispose() - which is the whole point behind the using statement. If you leave only the render(...) command inside the using block, you'll be fine and don't need any .Close(). – Mauramauralia

There's no WriteableBitmap in this answer, why is it the top one? :) It's completely unrelated to the question. – Hirsch

My guess is that it's upvoted because the original question may be akin to asking "How do I turn this screw with this hammer?" and the answer is "Use a screwdriver" instead of how to use the hammer to do it. – Obscenity

if you want to make WritableBitmap from it you can simply call: WritaBleBitmap result = new WritableBitmap(image); – Tele

Answer 3

If you don't mind using System.Drawing you could do something like:

var wb = new WriteableBitmap( width, height, dpi, dpi, 
                              PixelFormats.Pbgra32, null );
wb.Lock();
var bmp = new System.Drawing.Bitmap( wb.PixelWidth, wb.PixelHeight,
                                     wb.BackBufferStride, 
                                     PixelFormat.Format32bppPArgb, 
                                     wb.BackBuffer );

Graphics g = System.Drawing.Graphics.FromImage( bmp ); // Good old Graphics

g.DrawLine( ... ); // etc...

// ...and finally:
g.Dispose(); 
bmp.Dispose();
wb.AddDirtyRect( ... );
wb.Unlock();                    

Vernettaverneuil

I haven't had a chance to try it out just yet, but this seems like a very reasonable workaround in WPF. Thanks! – Cowitch

Just in case anyone is wondering, I tested the DrawingVisual WPF method mentioned in this topic and this System.Drawing method, and this System.Drawing method is MUCH FASTER. I'm very disappointed in WPF. – Cleaver

You can do the same thing with WPF, with similar (or better?) performance by using RenderTargetBitmap and DrawingVisual / DrawingContext – Shanks

Answer 4

I'm wondering the same thing, as currently I do something like:

DrawingVisual drawingVisual = new DrawingVisual();
using (DrawingContext drawingContext = drawingVisual.RenderOpen())
{
   //
   // ... draw on the drawingContext
   //
   RenderTargetBitmap bmp = new RenderTargetBitmap(width, height, dpi, dpi, PixelFormats.Default);
   bmp.Render(drawingVisual);
   image.Source = bmp;
}

I'm trying to use the WriteableBitmap to allow multithreaded access to the pixel buffer, which is currently not allowed with neither a DrawingContext nor a RenderTargetBitmap. Maybe some sort of WritePixels routine based off of what you've retrieved from the RenderTargetBitmap would work?

Emelda

Render spend too long – Highams

You cant write the bmp.Render in using that cant get the drawingVisual. – Highams

You may need to bmp.Freeze() if you're sharing the bitmap between threads. – Perrie

Answer 5

A different way to solve this problem is to use a RenderTargetBitmap as a backing store, just like in the WriteableBitmap example. Then you can create and issue WPF drawing commands to it whenever you want. For example:

// create the backing store in a constructor
var backingStore = 
      new RenderTargetBitmap(200,200,97,97,PixelFormats.Pbgra32);
myImage.Source = backingStore;

// whenever you want to update the bitmap, do:
var drawingVisual = new DrawingVisual();
var drawingContext = drawingVisual.RenderOpen();
{
    // your drawing commands go here
    drawingContext.DrawRectangle(
            Brushes.Red, new Pen(),
            new Rect(this.RenderSize));
}
Render(drawingContext);
drawingContext.Close();
backingStore.Render(drawingVisual);

If you want to redraw this RenderTargetBitmap every frame, you can catch the CompositionTarget.Rendering event, like this:

CompositionTarget.Rendering += MyRenderingHandler;

Shanks