author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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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-E56EB25C-9B94-5486-9492-5151FDF79B6C" xml:lang="en"><title>Global |
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Surface Updates</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>Global surface updates are surface updates that are submitted to all displays |
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rather than just one display. By using global surface updates, the Video Renderer |
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can update surfaces on all displays including ones that it is not aware of. |
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When the Video Renderer sends a global surface update, the update is broadcast |
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by the Graphics <xref href="GUID-81A0A2E9-4BB9-58BF-B2D3-08098E7E9C7C.dita">Surface |
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Update</xref> component to all Composition Implementations present in the |
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system. Each Composition Implementation determines whether the surface is |
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displayed on its associated screen and if so, forces an update. For more information, |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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see <xref href="GUID-D2ECF215-B53C-5659-BA86-5B658C0C2D2F.dita">Global Surface |
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Updates</xref> in the Graphics Guide. </p> |
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<p>The Video Renderer registers and unregisters surfaces with the Window Server |
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for all available displays. When the client calls <xref href="GUID-AFEC8287-41C9-36BB-B0F7-ECC034D34DC6.dita"><apiname>CVideoRenderer::CreateSurfaceL()</apiname></xref>, |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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the Video Renderer creates the surface and then registers it with each display. |
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When the client calls <xref href="GUID-AFEC8287-41C9-36BB-B0F7-ECC034D34DC6.dita"><apiname>CVideoRenderer::DestroySurfaceL()</apiname></xref>, |
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the Video Renderer unregisters the surface with each display and then destroys |
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it. The following sequence diagram shows how the Video Renderer registers |
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and unregisters surfaces: </p> |
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<fig id="GUID-B9190405-76E6-557D-A1F7-03ADDB8E456D"> |
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<title> Surface registration </title> |
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<image href="GUID-D729593E-C131-5F67-BF0C-6C9AD847C9F9_d0e302544_href.png" placement="inline"/> |
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</fig> |
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<p>The Video Renderer uses the global constant <codeph>KAllScreens</codeph> (provided |
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by the Surface Update component) to ensure all displays are updated with new |
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data. The following sequence diagram shows the Video Renderer passing <codeph>KAllScreens</codeph> in |
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the call to <xref href="GUID-AFEC8287-41C9-36BB-B0F7-ECC034D34DC6.dita"><apiname>RSurfaceUpdateSession::SubmitUpdate()</apiname></xref>: </p> |
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<fig id="GUID-4CA7A049-1B60-5CB5-956A-DDDFF0A5E3B1"> |
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<title> Data flow between client, Video Renderer and Surface Update |
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client-side API </title> |
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<image href="GUID-3C8FD050-1CD4-5AFB-ACB7-4264536BB300_d0e302567_href.png" placement="inline"/> |
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</fig> |
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</conbody><related-links> |
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<link href="GUID-98FBEA7E-78BA-5A64-90D6-4641418003B4.dita"><linktext>Video Renderer |
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Component</linktext></link> |
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<link href="GUID-63CB6C7E-44EC-5D0B-A37D-FE78F7D76592.dita"><linktext>Graphics |
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Composition Collection</linktext></link> |
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</related-links></concept> |