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Request() = 0 [implemented by a derived class]

The request gateway function takes a request number and two unde ned parameters, which are mapped from the RBusLogicalChannel as follows:

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Before moving on to complex shapes, let s take a look at using filters to add tints to images. The Internet is a huge library of copyright-free photos and drawings; use your favorite search engine to do an image search. (But remember that not every photo you find online is copyright-free be sure you have permission to use any image you find.) Many of the drawings are in black-and-white and can be a stark contrast to other elements of a page. One way to integrate them is to add a filter, which you can easily do by creating a partially transparent colored shape and place on top of the image. Using canvas, this process is quite easy. The key to the process is the following line:

DoControl(aFunction) DoControl(aFunction, a1) DoControl(aFunction, a1, a2)

context.fillStyle = rgba(rn, gn, bn, alpha) ;

Request(aFunction, 0, 0) Request(aFunction, a1, 0) Request(aFunction, a1, a2)

DoRequest(aReqNo, aStatus) Request( aReqNo, &aStatus, &A[0, 0]) DoRequest(aReqNo, aStatus, a1) Request( aReqNo, &aStatus, &A[a1, 0]) DoRequest(aReqNo, aStatus, a1, a2) Request( aReqNo, &aStatus, &A[a1, a2])

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Instead of using a hexadecimal value, it uses RGB with an alpha channel rgba() that controls for transparency. The last parameter is a value between 0 and 1. The higher the value, the more opaque the image will be. By using a value less than 1, you can control the degree of opacity. The rest of the shape matches the dimensions of the image and is positioned in the same space. To integrate an image with the rest of the page the plan is to add a color tint using the background color. The following program (FilterImage.html in this chapter s folder at

DoCancel(aReqMask)

www.wiley.com/go/smashinghtml5) adds the image first and then draws the rectangle object on top of it with a transparent fill color.

Request(0x7FFFFFFF, aReqMask, 0)

The following code shows how the RBusLogicalChannel::DoControl() method is implemented:

The irony is that the SQL is so beautifully simple to write; the concept of tables and rows and columns is so easy to understand Yet we could be searching for huge amounts of information from vast sources of data held all over the world and we don t even need to know where it is or how it can be found Neither do we have to worry about how long it s going to take or how much it s going to cost It all seems like magic Maybe that s part of the problem it s too easy; but then of course, it should be so easy We still recognize that problems will arise and huge problems at that Stories abound of simple queries that might have been expected to take a fraction of a second appear to be quite happy to take several minutes or even longer.

<!DOCTYPE html> <html> <head> <script language= javascript > //colors: F26A4B,F2D091=rgb(242,208,145) CanvasMaster=new Object(); CanvasMaster.showCanvas=function() { canvasNow = document.getElementById( filterFrame ); contextNow = canvasNow.getContext( 2d ); pic = new Image(); pic.onload = function() { contextNow.drawImage(pic,0,0); contextNow.fillStyle = rgba(242, 208, 145, .6) ; contextNow.fillRect(0,0,472,306); contextNow.fill(); } pic.src = dance.gif ; }

EXPORT_C TInt RBusLogicalChannel::DoControl(TInt aFunction, TAny *a1,TAny *a2) { return Exec::ChannelRequest(iHandle,aFunction,a1,a2); }

</script> <style type= text/css > body { font-family:Verdana; color:#F26A4B; background-color:#F2D091; } </style> <title>Filtering Images</title> </head> <body onLoad= CanvasMaster.showCanvas() > <article> <figure> <canvas id= filterFrame width= 472 height= 306 > Not only do you miss the filtered image, but you miss the dance! Get an HTML5 browser! </canvas> <figcaption> <br/> Filtered Image</figcaption> </figure> </article> </body> </html>

And here we show how an RBusLogicalChannel::DoRequest method is implemented. You can see that the stack is used to pass parameters a1 and a2. (This stack usage is represented in the previous table as \&A[a1,a2].)

EXPORT_C void RBusLogicalChannel::DoRequest(TInt aReqNo, TRequestStatus &aStatus, TAny *a1, TAny *a2) { TAny *a[2]; a[0]=a1; a[1]=a2; aStatus=KRequestPending; Exec::ChannelRequest(iHandle, aReqNo,&aStatus,&a[0]); }

Notice that the sequence first loaded the image and then placed the drawing on top using the following snippet:

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