c# - Merge Brush and BitmapImage Together -

i'm trying take brush applied button's background , render bitmapimage ontop of it, merging images , setting background.

rendertargetbitmap source = new rendertargetbitmap(convert.toint32(button.rendersize.width), convert.toint32(button.rendersize.height), 96, 96, pixelformats.pbgra32); drawingvisual visual = new drawingvisual();  using (drawingcontext drawingcontext = visual.renderopen()) {     drawingcontext.drawrectangle(button.background, null, new rect(new point(0, 0), new point(button.rendersize.width, button.rendersize.height)));     drawingcontext.close();     source.render(visual); }  visual = new drawingvisual();  using (drawingcontext context = visual.renderopen()) {     context.drawimage(source, new rect());     context.drawimage(image, new rect());     context.close(); }  source.render(visual); 

however, cannot set rendertargetbitmap background property of button. i'm not sure if best way of doing such thing.

if can convert rendertargetbitmap brush, effective approach?

cheers.

we have many ways using codebehind, try use xaml code here. idea using drawingbrush background. brush requires drawing. can use drawinggroup here, because allows append multiple drawings. care geometrydrawing , imagedrawing here. geometrydrawing can render brush using simple rectanglegeometry while imagedrawing can render image. here sample xaml code, suppose put inputs including input brush , input image resources:

<drawingbrush>    <drawingbrush.drawing>       <drawinggroup>         <geometrydrawing brush="{staticresource somebrush}">            <geometrydrawing.geometry>               <rectanglegeometry rect="0,0,1,1"/>            </geometrydrawing.geometry>         </geometrydrawing>         <imagedrawing imagesource="{staticresource someimage}" rect="0,0,1,1"/>       </drawinggroup>    </drawingbrush.drawing> </drawingbrush> 

note when using above brush background, fill whole element. rect not important here, can set (for both rectanglegeometry , imagedrawing) same value. when set tiled background, rect may important care about. should set other value.

in code above, imagedrawing declared after geometrydrawing rendered on top of geometrydrawing. means later declared drawings on top of before ones. here result in declared geometrydrawing (rendering lineargradientbrush green red) after imagedrawing can see transparent effect of lineargradientbrush: