<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
<!-- This component and the accompanying materials are made available under the terms of the License 
"Eclipse Public License v1.0" which accompanies this distribution, 
and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
<!-- Initial Contributors:
    Nokia Corporation - initial contribution.
Contributors: 
-->
<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-82B0B4B9-6BC2-5BEF-B3B0-D57AC57F8D8A" xml:lang="en"><title>Graphics
Resource Component Overview</title><shortdesc>The Graphics Resource component is not available on all systems.
When present, together with the Graphics Resource Adaptation component, it
provides an abstraction layer for the memory management of graphics data,
both pixel data and non-pixel data (such as OpenVG command lists). The Graphics
Resource component is the generic part, which provides the client API, whereas
the Graphics Resource Adaptation component provides the adaptation part, which
device creators can adapt to suit their graphics acceleration hardware if
any is available. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<p><b>Target audience</b>: Device creators.</p>
<note type="note">The Graphics Resource component is deprecated in Symbian^3
and will be removed in Symbian^4.</note>
<p>The <xref href="GUID-F2AF891D-A514-5743-B6F0-9271CE2A1775.dita">CBR package
name</xref> for the Graphics Resource component is <filepath>graphics_graphicsresource</filepath>. </p>
<section><title>Key classes</title> <p>The following diagram shows the relationships
between the key classes. </p> <fig id="GUID-053684EB-72B6-5D02-863D-6F24391A61B1">
<title>              Key Graphics Resource component classes            </title>
<image href="GUID-D20A513B-C612-5859-A551-28E1AA7FA332_d0e247380_href.png" placement="inline"/>
</fig> <table id="GUID-DBC2BBC9-E6B0-5DC0-B6B7-1D4186F901D2">
<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>
<thead>
<row>
<entry>Class</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><p> <xref href="GUID-EDC0E03F-37F6-3BEC-8FF3-D03C3CDB949C.dita"><apiname>RSgImage</apiname></xref>  </p> </entry>
<entry><p>A handle to a reference-counted, two-dimensional pixel array that
can be used as a source or target for different rendering pipelines. Attributes
that are set at creation time define parameters such as the size, screen and
usage. These cannot be changed after creation. </p> <p>An image can be shared
between processes by passing its unique identifier. Alternatively it can be
created as process-specific and not shareable, which may have performance
advantages. </p> </entry>
</row>
<row>
<entry><p> <xref href="GUID-FCF750E4-526C-3789-89D8-DEF02BB7A5A7.dita"><apiname>RSgImageCollection</apiname></xref>  </p> </entry>
<entry><p>A handle to a reference-counted collection of images with the same
attributes which is allocated in such a way that it can be used with the <xref href="GUID-0DC3E5AA-1706-5255-ACD6-E7AB732E1095.dita">graphics composition components</xref>.
Clients can access each of the images in the collection individually through <xref href="GUID-EDC0E03F-37F6-3BEC-8FF3-D03C3CDB949C.dita"><apiname>RSgImage</apiname></xref> handles.
Interoperability with the <xref href="GUID-0DC3E5AA-1706-5255-ACD6-E7AB732E1095.dita">graphics
composition components</xref> is achieved by passing the surface identifier
returned by <codeph>RSgImageCollection::SurfaceId()</codeph> in calls to the
Composition Interface API or the Surface Update API. </p> </entry>
</row>
<row>
<entry><p> <xref href="GUID-6F23F34A-A0BE-349C-ADE7-61A5AEF48018.dita"><apiname>RSgDrawable</apiname></xref>  </p> </entry>
<entry><p>A handle to a reference-counted graphics resource that can be drawn
in different rendering pipelines—for example, DirectGDI or OpenVG. Instances
of <xref href="GUID-6F23F34A-A0BE-349C-ADE7-61A5AEF48018.dita"><apiname>RSgDrawable</apiname></xref> allow access to drawable resources created
using other APIs without knowing the concrete type of the resource. </p> </entry>
</row>
</tbody>
</tgroup>
</table> </section>
</conbody><related-links>
<link href="GUID-26E51AB0-C0FC-55EA-B747-C834E2D4FD27.dita"><linktext>Graphics
Resource Services Collection</linktext></link>
<link href="GUID-E2A886E1-39FD-517F-870E-3B1BCD49E8CD.dita"><linktext>Off-Screen
Rendering with DirectGDI Tutorial</linktext></link>
</related-links></concept>