author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Wed, 31 Mar 2010 11:11:55 +0100 | |
changeset 7 | 51a74ef9ed63 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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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-E5CDDA05-CD86-5C44-B9DA-3249D9C14396" xml:lang="en"><title>Client-Side |
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Buffer</title><shortdesc>The Window Server client-side buffer enables drawing functions |
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to be buffered and executed in sequence. This saves many client-server context |
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switches and makes the system fast and responsive. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The Window Server handles many application function calls |
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as follows: </p> |
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<ol id="GUID-F51202BB-1519-5B86-BAAA-6B07D7D33DD2"> |
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<li id="GUID-6A0CC5DF-EB2B-5EF0-BA71-269A5472C0E7"><p>The client packages |
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the information to send to the server. </p> </li> |
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<li id="GUID-D3D22D1E-4C7D-5B9A-8F73-1730F9CD6979"><p>A context switch to |
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the server. </p> </li> |
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<li id="GUID-13D28353-8E11-5445-91B6-5D31550C0C9D"><p>Processing in the Window |
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Server—with possible inter-thread communication to and from the client. </p> </li> |
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<li id="GUID-7B29EB4D-80D6-53DB-AC13-9D3618FB3AE2"><p>A context switch back |
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to the client. </p> </li> |
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</ol> |
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<p>This guarantees that operations are performed in the right sequence and |
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that operations have been performed when control returns to the application |
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program. </p> |
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<p>However, for drawing and many other function calls, this approach is too |
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slow, and is not strictly necessary. </p> |
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<ul> |
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<li id="GUID-CDEC7D13-E43B-529B-88DD-C7542BE16AA0"><p>The overheads of the |
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client/server communication swamp the time needed for drawing and cause severe |
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system degradation. </p> </li> |
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<li id="GUID-55A4C852-B5B0-55FE-9E62-38C21613BFFC"><p>It is unnecessary because |
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the client program does not need a result from drawing functions. This is |
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also true for some non-drawing functions. </p> </li> |
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</ul> |
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<p>Because of this, drawing functions, and other functions that do not need |
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a synchronous response, are buffered by the client interface in a command |
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buffer. When necessary, this buffer is flushed by a call to the Window Server, |
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which executes all the drawing functions in sequence. Thus, two context switches |
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are sufficient for an entire buffer full of drawing requests. </p> |
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<p>The Window Server buffer is flushed when: </p> |
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<ul> |
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<li id="GUID-54B10BF7-7007-56A6-9C88-CF9C22549FF1"><p>It is full. </p> </li> |
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<li id="GUID-7EE4C889-BEBB-54FA-8FA2-3A5DE1F2B24C"><p>A function requiring |
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a result is called. </p> </li> |
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<li id="GUID-0F9FA1C9-23AD-5C90-B670-A3D2D1653C47"><p>One of the event-request |
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functions is called (<xref href="GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9.dita#GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9/GUID-0F961C4D-A731-3AE0-8425-BB304CCF2736"><apiname>RWsSession::EventReady()</apiname></xref>, <xref href="GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9.dita#GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9/GUID-DADAFFD6-4B63-35EE-8F50-F397C119CC27"><apiname>RWsSession::RedrawReady()</apiname></xref>, <xref href="GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9.dita#GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9/GUID-97E7096D-930B-3CA5-9645-7BD60D0FADDD"><apiname>RWsSession::PriorityKeyReady()</apiname></xref>). </p> </li> |
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<li id="GUID-927412D4-1700-59BE-B0BB-B75366D28A36"><p>Certain high-level functions |
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are called by the client, such as <xref href="GUID-0AEE5955-C530-35F1-A904-69183331B294.dita#GUID-0AEE5955-C530-35F1-A904-69183331B294/GUID-76018E73-B3D8-33B7-970F-0B6300F7EFB2"><apiname>CWindowGc::DrawPolyLine()</apiname></xref>, |
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which involve mass data transfer which would overflow the buffer, and which |
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may fail. </p> </li> |
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<li id="GUID-35BFA73D-CE16-5B49-9C89-840F7A7222A3"><p>An explicit <xref href="GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9.dita#GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9/GUID-B83C6F44-1A3E-3959-910C-CBBF66C4A3D4"><apiname>RWsSession::Flush()</apiname></xref> call |
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is made. </p> </li> |
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<li id="GUID-0B9C1E0F-F6D5-5999-A170-263738C39C7D"><p>After any function call |
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if the <xref href="GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9.dita#GUID-643DDA78-C7A7-386D-AB3F-8710141DDDA9/GUID-0F337487-1104-3F97-800A-3393C9EDD116"><apiname>RWsSession::SetAutoFlush()</apiname></xref> auto flushing function |
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is set on. </p> </li> |
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</ul> |
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<p>It is desirable that the buffer is flushed when the application has finished |
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a unit of drawing. This is usually done as a natural consequence of calling |
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the function to wait for the next event from the Window Server. This covers |
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all cases where drawing is initiated in response to a Window Server event. |
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There are a few cases where drawing is initiated in response to other events. |
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In these cases, an explicit <codeph>Flush()</codeph> call must be made. </p> |
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<p>The use of a buffer has two main impacts on drawing logic: </p> |
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<ul> |
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<li id="GUID-29455CA7-A061-5279-8FD0-DCCBB7E4CB76"><p>While debugging, client |
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requests do not immediately result in screen updates. This can make debugging |
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confusing at times. </p> </li> |
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<li id="GUID-59002F65-4334-5C7B-A071-DB9D8A723B66"><p>If this is a problem, |
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the application program can turn on auto-flushing, which causes flushing after |
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each function call. The Uikon UI provides a hot-key, CTRL+ALT+SHIFT+F, to |
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turn on auto-flushing. (The resulting degradation in performance is a convincing |
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demonstration of the need for the buffer). </p> </li> |
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<li id="GUID-7927A766-7C23-514D-97EA-CE420FCCD489"><p>The GDI is so fast that |
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most drawing activity that takes place within the context of a single flush |
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appears as an almost instantaneous update. If, however, a drawing sequence |
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is interrupted by a flush, there may be a perceptible delay. In some circumstances, |
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this may result in flicker. </p> </li> |
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<li id="GUID-148AF35C-3B8A-5DC0-BC7E-0D6503877CE3"><p>The aesthetics of a |
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program can be badly affected by flicker during drawing. Applications should |
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use flicker-free functions (such as <codeph>DrawText()</codeph> with a rectangle), |
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and try to minimize flushing during critical redraw sequences. If completely |
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flicker-free drawing is impossible, short drawing sequences that are flush-free |
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may sometimes be an acceptable alternative. </p> </li> |
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</ul> |
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<p>The Window Server manages the buffer intelligently so as to minimize flushing. |
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The opcodes stored in the buffer are short, and repeated use of the same graphics |
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context is indicated by a single bit rather than repeated reference to the |
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graphics context. </p> |
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<p>Applications may modify the size, or the maximum size of the buffer to |
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tune performance or to accommodate long messages. A larger buffer may reduce |
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flicker by collecting more drawing commands. A smaller buffer uses less memory. |
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Setting a maximum size allows the Window Server to perform its own optimizations. </p> |
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<p>If a message is too big for the buffer, a panic (#5 - <codeph>EW32PanicDataExceedsBufferLength</codeph>) |
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occurs. optimizations </p> |
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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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</related-links></concept> |