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Adaptation/GUID-0C3A4156-E5CF-55F9-91A0-A7961FDEE030.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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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-0C3A4156-E5CF-55F9-91A0-A7961FDEE030" xml:lang="en"><title>LCD Extension Architecture</title><shortdesc>This topic describes the architecture of the LCD Extension. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The LCD Extension (or video driver) is implemented as a standard
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kernel extension and is loaded by the kernel at boot time. </p>
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<p>The public interface to the LCD Extension is accessed through the
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User-Side Hardware Abstraction (HAL) interfaces <xref href="GUID-BD00E7FC-C234-3111-87A5-10F79EB0F2B8.dita#GUID-BD00E7FC-C234-3111-87A5-10F79EB0F2B8/GUID-573C49D6-7763-37AE-B2B2-4C8FB1327E21"><apiname>HAL::Get()</apiname></xref> and <xref href="GUID-BD00E7FC-C234-3111-87A5-10F79EB0F2B8.dita#GUID-BD00E7FC-C234-3111-87A5-10F79EB0F2B8/GUID-9454F1B2-D525-3D6D-A872-C6457CACD4FC"><apiname>HAL::Set()</apiname></xref>. The LCD Extension registers itself
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with the kernel as the handler for the <xref href="GUID-7F299BFC-D8A5-3A5A-B8DA-39BF42C99DC6.dita"><apiname>EHalGroupDisplay</apiname></xref> function group and implements the functions. </p>
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<p>From Symbian^3 there is a new graphics architecture called <xref href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita">ScreenPlay</xref>. When ScreenPlay is in use, the <xref href="GUID-4C166A49-31F7-5315-B797-F97DB52600BC.dita">Display Channel Driver</xref> can provide a logical device driver proxy between the Composition
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Implementation and the LCD Extension. However, the use of the Display
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Channel Driver is optional and implementers may decide not to use
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it. </p>
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<p>When ScreenPlay is not in use, the Graphics <xref href="GUID-9E7D563E-9FFB-5FA9-8944-9CBAC281FDD2.dita">Screen Driver component</xref> is a client of the LCD Extension. The Screen Driver is platform-specific
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and must be ported by the device creator. </p>
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<p>The Text Window Server also implements a version of the Screen
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Driver for a simple console user interface. </p>
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</conbody><related-links>
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<link href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita"><linktext>The
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ScreenPlay Graphics                 Architecture</linktext></link>
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<link href="GUID-F64E6551-670E-5E12-8103-DE504D3EC94F.dita"><linktext>The
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Non-ScreenPlay                 Graphics Architecture</linktext></link>
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<link href="GUID-4C166A49-31F7-5315-B797-F97DB52600BC.dita"><linktext>Display
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Channel Driver</linktext></link>
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<link href="GUID-9E7D563E-9FFB-5FA9-8944-9CBAC281FDD2.dita"><linktext>Screen
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Driver                 Component</linktext></link>
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</related-links></concept>
FCL/sftools/depl/docscontent