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// RADCON = (Math.PI/180) ; RADCON=0.01745329251994; twelve=0; three = RADCON * 90; six = RADCON * 180; nine = RADCON * 270; contextNow.beginPath(); contextNow.arc(125,100,50,six,twelve,true); //contextNow.closePath(); //contextNow.fill() contextNow.stroke(); } </script> <style type= text/css > body { font-family:Verdana, Geneva, sans-serif; color:#cc0000; } </style> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <title>Smile</title> </head> <body onLoad= CanvasMaster.showCanvas() > <figure> <canvas id= beHappy width= 300 height= 200 > You don t see a smile because you don t have an HTML5 browser. No smile for you!</canvas> <figcaption> <p>Rectangle represents canvas boundaries</p> </figcaption> </figure> </body> </html>

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The calling thread is blocked until the message is delivered and the driver signals that it has received the message by completing it, using TMessageBase::Complete(). This does not necessarily mean that the requested operation is done merely that the message has been received and the driver is ready to accept a new one. If the driver thread is asked to perform a long running task, it will later use a TRequestStatus object to signal completion to the client. Since all messages are delivered to the same DFC queue, this has the effect of serializing requests from multiple threads. The message queue is constructed during the construction of the DLogicalChannel, and it is speci ed as a parameter to that construction in this way:

EXPORT_C DLogicalChannel::DLogicalChannel() : iMsgQ(MsgQFunc,this,NULL,1) { }

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The RADCON variable is a constant ( 180), so all degrees were set to radians by multiplying their values by RADCON. As noted, the variable names represent the positions on a clock. In addition, a rectangle around the area where the arc is drawn represents the boundaries of the <canvas> tag s width and height. Figure 13-14 shows the result. The starting point of the arc is on the left, and it moved anticlockwise to the ending point on the right. Change the following line:

The NULL parameter is the DFC queue, which in this example is initialized in the DoCreate() function:

contextNow.arc(125,100,50,six,twelve,true);

SetDfcQ(Kern::DfcQue0()); iMsgQ.Receive();

SetDfcQ is inherited from DLogicalChannel, and is responsible for storing the DFC queue and passing it on to the message queue:

contextNow.arc(125,100,50,six,twelve,false);

EXPORT_C void DLogicalChannel::SetDfcQ(TDfcQue* aDfcQ) { iDfcQ=aDfcQ; iMsgQ.SetDfcQ(aDfcQ); }

That changed the drawing from anticlockwise to clockwise, but it made a major difference, as you ll see when you test it. 278 Next, using the same program, change the line back to:

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Note that in DoCreate(), I called iMsgQ.Receive() immediately after setting up the message queue with the appropriate DFC queue. This marks the queue as ready, so that the rst message to be received will be accepted immediately. If a message is already available, iMsgQ. Receive() immediately queues a DFC to service this message within the context of the device driver s chosen thread. DLogicalChannel de nes its message queue function like this:

void DLogicalChannel::MsgQFunc(TAny* aPtr) { DLogicalChannel* pC=(DLogicalChannel*)aPtr; pC->HandleMsg(pC->iMsgQ.iMessage); }

contextNow.arc(125,100,50,six,twelve,true);

HandleMsg() is the pure virtual function implemented by the device driver to handle the incoming requests, and I ll explain this in detail shortly. First, I ll explain how messages are added to the queue. DLogicalChannel provides its own implementation of the Request() gateway function:

Then remove the comment lines (//) from the following line:

EXPORT_C TInt DLogicalChannel::Request(TInt aReqNo, TAny* a1, TAny* a2) { if (aReqNo<(TInt)EMinRequestId) K::PanicKernExec(ERequestNoInvalid); TThreadMessage& m=Kern::Message(); m.iValue=aReqNo; m.iArg[0]=a1; if (aReqNo<0) { kumemget32(&m.iArg[1],a2,2*sizeof(TAny*)); } else m.iArg[1]=a2; return m.SendReceive(&iMsgQ); }

Remember that this is running in the context of the user-side client thread. This means that Kern::Message() obtains the client thread s message object and uses this as a placeholder for the request arguments supplied.

//contextNow.closePath();

EXPORT_C TThreadMessage& Kern::Message() { return TheCurrentThread->iKernMsg; }

And test it again. The final change to the program will fill the arc. Uncomment the line from the following:

Now, you may remember that when I discussed the user-side APIs representing the logical channel (Section 12.4.6.4), I described how synchronous requests pass a request number and up to two optional request arguments, while asynchronous requests pass the compliment of the request number, a pointer to a TRequestStatus object and a user-side structure containing two function arguments:

When WSERV adds a move or a drag event to the client queue, it checks the event that is currently at the end of the client queue, and if this is an identical event apart from the co-ordinates, then WSERV will just replace the old event with the new one. This means that the client won t get very ne-grained information on pen or mouse moves. This is no problem, indeed it is bene cial, for most applications, but for a drawing application it is not ideal. So, for such applications, WSERV can alternatively store all the events that it gets from the kernel in a buffer, and the client will then get a block of them delivered at once.

//contextNow.fill()

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