Symbian3/SDK/Source/GUID-B1CB6374-2C2B-5D6C-9A7C-6E49D8F235B8.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 21 Jan 2010 18:18:20 +0000
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-B1CB6374-2C2B-5D6C-9A7C-6E49D8F235B8" xml:lang="en"><title>Display
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Control and Mapping in the Window Server Client</title><shortdesc>ScreenPlay provides support for externally connected displays,
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such as TV-out. Previous versions of Symbian and the non-ScreenPlay variant
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consider the size of each display to be fixed, assuming it to be built into
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the phone. However, for High-Definition Multimedia Interface (HDMI) and composite
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video connectors, there is a range of resolutions that can change dynamically.
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ScreenPlay provides an optional feature that supports switching between resolutions
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at runtime and notifies Window Server clients when there are changes to the
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resolution and connectedness. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>This topic builds on the introduction in <xref href="GUID-0EBE5733-A267-5F4A-85AD-87C3ECF80731.dita">Dynamic
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Resolution Switching</xref>. </p>
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<p>The <xref href="GUID-30479BE3-296E-3B4D-914D-B080ABD733E4.dita"><apiname>CWsScreenDevice</apiname></xref> Window Server client-side API has
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a <xref href="GUID-49DCA149-A46F-3DB1-9879-AEDDFE1746B9.dita"><apiname>GetInterface()</apiname></xref> function, which you can use to return
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pointers to the <codeph>MDisplayControl</codeph> and <codeph>MDisplayMapping</codeph> interfaces
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or null if the interface is not supported. For example: </p>
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<codeblock id="GUID-1F87BCBD-F4FB-5C20-8B94-01088F79CD73" xml:space="preserve">// Establish connection and get display control interface.
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class CWindowClient : public CBase
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    {
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    ...
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    RWsSession iSession;
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    CWsScreenDevice* iScreenDevice;
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    MDisplayControl* iDisplayControl;
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    MDisplayMapping* iDisplayMapping;
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    TWsDisplayChangedEvent iLastEvent;
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    }
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void CWindowClient::ConstructL(TInt aDisplayNumber)
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    {
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    User::LeaveIfError(iSession.Connect());
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    iScreenDevice = new(ELeave) CWsScreenDevice(iSession);
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    User::LeaveIfError(iScreenDevice-&gt;Construct(aDisplayNumber));
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    iDisplayControl = iScreenDevice-&gt;GetInterface(EDisplayControl);
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    User::LeaveIfNull(iDisplayControl);
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    iDisplayMapping = iScreenDevice-&gt;GetInterface(EDisplayMapping);
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    User::LeaveIfNull(iDisplayMapping);
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    }</codeblock>
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<p>In addition, <xref href="GUID-30479BE3-296E-3B4D-914D-B080ABD733E4.dita"><apiname>CWsScreenDevice</apiname></xref> provides the <xref href="GUID-01040953-1D8A-3DD8-B3E4-047C29F7BAAC.dita"><apiname>IsCurrentModeDynamic()</apiname></xref> and <xref href="GUID-259598EF-8A53-3EED-8A4D-E24038B902F2.dita"><apiname>IsModeDynamic()</apiname></xref> functions
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for querying whether the current screen mode and a given screen mode are dynamic.
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If a screen mode is dynamic, the application extent always fills the full
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UI space and the area returned by <xref href="GUID-30479BE3-296E-3B4D-914D-B080ABD733E4.dita#GUID-30479BE3-296E-3B4D-914D-B080ABD733E4/GUID-8E1B5729-FD1C-3D4A-AC73-C6364E7D5BBF"><apiname>CWsScreenDevice::SizeInPixels()</apiname></xref> always
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matches the actual resolution that is in use. However, the <codeph>MDisplayMapping</codeph> interface
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also provides features that enable you to draw outside the application UI
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extent. </p>
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<section> <title>MDisplayControl</title> <p>The <xref href="GUID-0C384D35-77DD-318E-AF3E-C9ED5ADD9D11.dita"><apiname>MDisplayControl</apiname></xref> interface
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provides Window Server clients with functions for setting and getting the
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current display configuration, getting a list of available resolutions and
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enabling display change event notifications (<xref href="GUID-6426E0A6-35F2-3704-962C-0A8AE8AF7226.dita"><apiname>EEventDisplayChanged</apiname></xref>).
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The following diagram shows the class hierarchy. </p> <fig id="GUID-F9D95387-151F-5725-8BDD-C44A3D333A97">
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<title> Display control class diagram            </title>
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<image href="GUID-68E3609C-3429-5B1C-B8D9-C0EBBACEF357_d0e165199_href.png" placement="inline"/>
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</fig>  <p>Once you have obtained
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the <xref href="GUID-0C384D35-77DD-318E-AF3E-C9ED5ADD9D11.dita"><apiname>MDisplayControl</apiname></xref> interface, you can call <xref href="GUID-B50897AC-CF6F-3887-9475-A46A7C86A42D.dita"><apiname>GetResolutions()</apiname></xref> on
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it. For example: </p> <codeblock id="GUID-C82D0166-0E29-5F90-8087-800EDDE2D895" xml:space="preserve">// Get available resolutions
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RArray&lt;MDisplayControl::TResolution&gt; resolutions;
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User::LeaveIfError(iDisplayControl-&gt;GetResolutions(resolutions));
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// Use resolution list.
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</codeblock> <p>You can use the <xref href="GUID-66F4BAEC-13F4-3617-B86A-5BD3BCAB82A0.dita"><apiname>EnableDisplayChangedEvents()</apiname></xref> function
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to register for notifications of the <xref href="GUID-6426E0A6-35F2-3704-962C-0A8AE8AF7226.dita"><apiname>EEventDisplayChanged</apiname></xref> event.
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This is generated when the display device is attached or detached or there
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is a change in the current resolution, the resolution list or the current
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configuration. For example, this can be generated by a render stage or the
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composition engine in response to a hardware event (such as an external display
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being connected or disconnected). The event is sometimes, but not always,
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triggered by a change in the screen mode. </p> <p>There are therefore two
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aspects to the event in that it can be triggered by a display change or a
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configuration change. Typically you check the event against the previous one
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to see what has changed. </p> <p>The following table provides a summary of
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how this event compares to <xref href="GUID-CC1E6B2E-F68F-3A00-B4EA-4917007F7320.dita"><apiname>EEventScreenDeviceChanged</apiname></xref>. </p> <table id="GUID-50D8232A-E394-590F-A762-79567E4424C3">
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<tgroup cols="3"><colspec colname="col0"/><colspec colname="col1"/><colspec colname="col2"/>
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<thead>
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<row>
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<entry>Action</entry>
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<entry><codeph>EEventScreenDeviceChanged</codeph> </entry>
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<entry><codeph>EEventDisplayChanged</codeph> </entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><p>Screen mode change </p> </entry>
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<entry><p>Always triggers this event </p> </entry>
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<entry><p>Triggers this event only if it causes a change in the configuration. </p> </entry>
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</row>
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<row>
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<entry><p>Display configuration change </p> </entry>
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<entry><p>Generally does not trigger this event </p> </entry>
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<entry><p>Generally triggers this event </p> </entry>
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</row>
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</tbody>
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</tgroup>
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</table> <p>The following example first registers for notification of <xref href="GUID-6426E0A6-35F2-3704-962C-0A8AE8AF7226.dita"><apiname>EEventDisplayChanged</apiname></xref> events
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and then changes the screen mode. The second part illustrates a simplified
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handler for the events. It demonstrates checking the event against the previous
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one to see whether the resolution or configuration has changed. </p> <codeblock id="GUID-E78D2CA8-4C1E-5E19-92EC-7E87B010E5BE" xml:space="preserve">// Establish connection and get display control interface.
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iDisplayControl-&gt;EnableDisplayChangeEvents(ETrue);
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iScreenDevice-&gt;SetScreenMode(2);    // Number depends on WSINI.INI config.
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iScreenDevice-&gt;SetAppScreenMode(2); // Ensure application windows are
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                                    // shown in the new mode.
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...
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// Simplified event handler.
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TWsEvent event;
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iSession.GetEvent(event);
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switch (event.Type())
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    {
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    case EEventScreenDeviceChanged:
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        {
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        TSize screenSize = iScreenDevice-&gt;SizeInPixels();
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        // Re-layout windows for new application screen dimensions
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        }
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        break;
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    case Redraw:
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        {
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        // Draw content of window
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        }
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        break;
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    case EEventDisplayChanged:
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        {
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        TWsDisplayChangedEvent* newEvent;
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        newEvent = event.DisplayChanged();
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        if (newEvent-&gt;iResolutionListChangeId !=
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            iLastEvent.iResolutionListChangeId)
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            {
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            // ...
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            }
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        if (newEvent-&gt;iConfigurationChangeId !=
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            iLastEvent.iConfigurationChangeId)
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            {
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            TDisplayConfiguration config;
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            User::LeaveIfError(
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                iDisplayControl-&gt;GetConfiguration(config)));
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            // Handle updated configuration
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            // May be entirely handled by screen device changed event
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            }
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        iLastEvent = *newEvent;
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        }
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        break;
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    }</codeblock> <p>Here is an example of setting a new display resolution: </p> <codeblock id="GUID-B9C0254D-3990-5B41-9F63-1A81D30A3FB6" xml:space="preserve">TDisplayConfiguration config;
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config.SetResolution(TSize(1280, 720));
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config.SetRotation(MDisplayControl::ERotation180);
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User::LeaveIfError(iDisplayControl-&gt;SetConfiguration(config));
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</codeblock> </section>
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<section> <title>MDisplayMapping</title> <p>The <xref href="GUID-BA6FEFAE-8891-3286-A38F-2EA522D7A27E.dita"><apiname>MDisplayMapping</apiname></xref> interface
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enables Window Server clients to map between coordinate spaces, allowing for
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translation and scaling of coordinates. For example, suppose an application
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is to draw a virtual keyboard outside of the application's extent. This requires
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knowing the extent of both the application and the full UI area. The application
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can use the <xref href="GUID-BA6FEFAE-8891-3286-A38F-2EA522D7A27E.dita"><apiname>MDisplayMapping</apiname></xref> interface to get this information,
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so that the virtual keyboard can be drawn within the full UI area but outside
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of the application's extent. </p> <fig id="GUID-55BD49C6-9A51-53A7-A587-29A151FACF6B">
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<title> Display mapping class diagram            </title>
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<image href="GUID-7293765E-2B1E-5F0D-B6A8-0E48729DC365_d0e165342_href.png" placement="inline"/>
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</fig> <p> </p> <p>The <xref href="GUID-BA6FEFAE-8891-3286-A38F-2EA522D7A27E.dita"><apiname>MDisplayMapping</apiname></xref> interface is very
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flexible. UIDs are used to signify the application UI coordinate space, the
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full UI space, the composition/display coordinate space (which may be a different
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scale to the UI coordinate space) and the Direct Screen Access (DSA) space
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(which may match the full UI space, or be offset relative to the application
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UI space). </p> <p>The <xref href="GUID-53AF1470-F06E-321C-AF64-FE422A7662DA.dita"><apiname>MapCoordinates()</apiname></xref> function takes
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a rectangle, a source space and a target space and returns the correspondingly
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mapped rectangle in the target space. To map a point, use a rectangle with
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a width and height of one pixel, because the scaling between UI space and
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composition/display space may enlarge (or sometimes reduce) the rectangle’s
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size. </p> <p>For example, consider the following diagram, in which the outer
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rectangle represents the display area and the inner one represents the application
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space (screen mode). </p> <fig id="GUID-6935A7BE-C651-5582-8E2A-11A18CDD531F">
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<title>Display area and application extent            </title>
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<image href="GUID-09142C26-0AFA-510E-836D-010EE07A1549_d0e165370_href.png" placement="inline"/>
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</fig> <p>The display resolution is 1280 x 720, the application size is 176
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x 208 and a virtual resolution of 426 x 240 has been introduced, which gives
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a scaling factor of three in each direction. All pixels are approximately
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square, for simplicity. The application area has been centered in the display,
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giving an <i>X</i> offset of (426-176)/2 and a <i>Y</i> offset of (240-208)/2,
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or (125, 16). </p> <p>To put a window on screen to fill the display, create
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a rectangle positioned at (0,0) with a size of the current resolution (426
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x 240). Then pass this in with a source space of the full UI and target space
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of the application. This results in a rectangle of the same size but at offset
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(125,16). </p> <p>In addition, to use an external surface at the real resolution,
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pass this rectangle in with a source space of the application UI and a target
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space of the composition/display. This results in a rectangle with size of
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1280 x 720, which you can then use when creating the surface. Because the
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UI surface and external surface are scaled independently, the UI memory requirements
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can remain low, even with high resolution video, viewfinder and games. For
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an example code snippet, see <xref href="GUID-495EA1C8-E95F-54AE-B4D1-0F463003C2D7.dita">External
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Surfaces Overview</xref>. </p> </section>
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</conbody><related-links>
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<link href="GUID-1F9A47CE-7F4C-52BD-8823-25D5D1BEF42F.dita"><linktext>Window Server
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Client-Side Library                 Concepts</linktext></link>
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<link href="GUID-0EBE5733-A267-5F4A-85AD-87C3ECF80731.dita"><linktext>Dynamic Resolution
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                Switching</linktext></link>
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<link href="GUID-1D529BDC-6665-58E2-AB3F-7023D8A84F69.dita"><linktext>The wsini.ini
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File                 Reference</linktext></link>
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</related-links></concept>