author | MattD <mattd@symbian.org> |
Tue, 23 Mar 2010 13:32:10 +0000 | |
branch | NewGraphicsArchitecture |
changeset 21 | b77288873c88 |
parent 0 | 5d03bc08d59c |
child 36 | 01a6848ebfd7 |
permissions | -rw-r--r-- |
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// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// |
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#ifndef __SURFACEUPDATECLIENT_H__ |
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#define __SURFACEUPDATECLIENT_H__ |
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#include <e32std.h> |
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#ifdef TEST_SURFACE_UPDATE |
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#include "surfaceupdate.h" |
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#include "surfaceupdatetest.h" |
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#endif |
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class TSurfaceId; |
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const TInt KDefaultMessageSlot = 6; |
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typedef TPckgBuf<TUint32> TTimeStamp; |
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/** |
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The RSurfaceUpdateSession class is intended to be used by surface update control flow. |
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The class implements an interface between the Compositor and clients. It allows a client to |
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inform the Compositor when a surface has been modified and to receive notification when |
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its buffer becomes available and/or displayed. |
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*/ |
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class RSurfaceUpdateSession : public RSessionBase |
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{ |
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public: |
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IMPORT_C RSurfaceUpdateSession(); |
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/** |
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Connect to the server using given number of message slots. |
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@param aMessageSlots The number of message slots available to this session. |
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This parameter is defined in RSessionBase specification; it signifies the maximum number |
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of asynchronous outstanding requests to the server. |
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SubmitUpdate commands could contain up to three asynchronous requests to the server, |
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each corresponds to a different type of notification. |
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@see RSessionBase |
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@pre The surface update server is started up |
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@post Connection to the server has been established. |
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@return KErrNone if successful. |
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@return KErrAlreadyExists if the session has already been established. |
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@return KErrArgument if arguments don’t lie within expected range. |
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@return KErrNotFound if the server is not in operation, otherwise one of the |
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system-wide error codes. |
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*/ |
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IMPORT_C TInt Connect(TInt aMessageSlots = KDefaultMessageSlot); |
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/** |
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Close the session to the server. |
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@pre Outstanding notification requests (if any) are cancelled. |
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@post The session is disconnected. |
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*/ |
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IMPORT_C void Close(); |
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/** |
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Send update message to the server. All notification requests will also be submitted at |
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this stage. |
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This is referring to when notifications are requested before the update request. |
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<p>The GCE may collapse a few requests into one. |
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If a few requests with different buffer numbers specified for the same surface have |
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been submitted at specific composition cycle, only last such request will have effect. |
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<p>Clients can send a global submit update which will be broadcast by the SUS to all |
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backends presented in the system. For a global update, to all screens, |
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the pre-defined constant KAllScreens needs to be passed as the screen parameter |
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to SubmitUpdate. |
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Note that once a Client has begun issuing SubmitUpdate with either KAllScreens or a |
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specific screen, then only that type of screen can be used thereafter for that |
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Surface Update Session, i.e. the client cannot have a mix of SubmitUpdate with |
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KAllScreens and specific screens. |
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@see RSurfaceUpdateSession::NotifyWhenAvailable |
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@see RSurfaceUpdateSession::NotifyWhenDisplayed |
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@see RSurfaceUpdateSession::NotifyWhenDisplayedXTimes |
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@param aScreen Screen number. Varies from 0 to N-1, where N is a total number of screens |
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in the system. If pre-defined constant KAllScreens is passed, the submission will |
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be broadcast to all screens. |
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@param aSurfaceId Secure 128-bit surface unique identifier, which fully specified the |
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surface. Surface ID must be assigned and registered with the GCE. |
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@param aBuffer Current buffer for composition. Varies from 0 to N-1, where N is the |
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total number of buffers in the surface. |
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@param aRegion The region requiring update, if this is NULL or empty, the whole |
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surface will be used for composition. The function doesn’t take ownership of |
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this parameter. |
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102 |
@pre The surface session must be established to the server. |
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@post The GCE will trigger composition to use this region at the next composition cycle. |
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104 |
|
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@return KErrNone if a message has been transferred to the server successfully. |
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@return KErrArgument if arguments don’t lie within expected range. |
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@return KErrBackendNotAvailable if backend for specified screen hasn’t been registered |
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108 |
with the server. |
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@return KErrNotSupported if global and per-screen update are mixed within the same session. |
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@return KErrNoMemory if the memory is not enough to fulfill the request, |
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otherwise one of the system-wide error codes. |
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Will panic if applied on disconnected session. |
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113 |
*/ |
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IMPORT_C TInt SubmitUpdate(TInt aScreen, const TSurfaceId& aSurfaceId, TInt aBuffer, |
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const TRegion* aDirtyRegion = NULL); |
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116 |
|
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117 |
/** |
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118 |
The message signals the client that the buffer associated with the notifier is available |
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for further updates. |
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<p>For performance reasons, the GCE uses the buffer sent by the client for composition |
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directly rather than composing with a copy of the buffer. |
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This means that, potentially, a client could be rendering to a buffer which is currently |
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123 |
being used for composition, leading to artefacts and possible tearing. |
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Depending on whether the surface is single or multi-buffered, there is some difference |
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in behaviour: |
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<li>In the case of single-buffered surfaces, the GCE will not wait for the next |
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submit update and will complete the request after the composition. </li> |
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<li>In case of multi-buffered surfaces, the GCE can postpone with the issuing the notification |
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129 |
to the client even after the composition with the specified surface buffer has already happened, |
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130 |
and issues the request when the client changes the active buffer, i.e. submits another |
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request for update with different buffer. This will help the GCE to keep the active buffer in a |
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132 |
valid state should another composition required.</li> |
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<p>This notification enables a client to, if desired, be able to perform artefact free |
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134 |
rendering using this notification in conjunction with a multi-buffered surface. |
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<p>Note that since the compositor can delay to issue request complete for multi-buffered |
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surface until the change of the active buffer occurs, the completion of a particular |
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notifier may not relate to the buffer to which it is intuitively associated. |
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<p>Only the last call of this function before SubmitUpdate command takes place will have |
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effect, i.e. the following call will override the previous one. |
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This request will only be associated with the following single call of the SubmitUpdate. |
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<p>When a SubmitUpdate has been broadcast to all available screen, i.e. KAllScreens was |
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142 |
supplied as a screen number, for multi-buffered surfaces, the notification will be completed |
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when the surface buffer has been released by all displays it is being shown on. |
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For single-buffered surfaces, notification will be completed when all displays have read |
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the buffer once. |
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146 |
|
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@param aStatus Reference to the request status object. |
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148 |
|
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@see RSurfaceUpdateSession::SubmitUpdate |
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150 |
|
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@pre The surface session must be established to the server. |
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@post This request for the consumption notification event will be transferred to the GCE |
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at next SubmitUpdate command. |
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154 |
|
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@return KErrNone if consumption has succeeded, the request completed aStatus will |
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156 |
contain this code. |
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@return KErrOverflow if the GCE drops the frame for composition. That could happen |
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if the GCE can’t cope with the current composition rate or the new request arrives |
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159 |
while the current is still in a progress. |
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The buffer overflow error can only happen with double buffering: |
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<li>If notification is not being used</li> |
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<li>If notification is not being used correctly as the client is not waiting for |
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163 |
notification to complete before sending a further buffer.</li> |
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164 |
|
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If an application such as video is using three (or more) buffers, this error can occur. |
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166 |
For instance, the video may be producing frames at a fixed rate which is faster than |
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the GCE can cope with, and in this case frames will be “lost”, but the notification |
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168 |
mechanism will still operate correctly. |
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169 |
|
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@return KErrBackendNotAvailable if backend for specified screen hasn’t been registered |
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171 |
with the server. |
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@return KErrArgument if arguments in SubmitUpdate command don’t lie within expected range. |
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@return KErrCancel if notification has been cancelled. It could happen, for instance, |
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if CancelUpdateNotification is called before the request is completed. |
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@return KErrServerBusy if the number of outstanding requests has exceeded specified |
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value (see RSurfaceUpdateSession::Connect for details). |
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@return KErrNotReady if the environment is in invalid state (for instance, the Surface |
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Update Server has not been launched or the session is disconnected). |
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@return KErrSurfaceNotRegistered if the surface is not registered with the specific backend. |
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@return KErrNotVisible if the surface specified in SubmitUpdate is not visible. |
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This could happen if there is no layer associated with the surface or no active |
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composition scene. |
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Note, the absence of this error code does not guarantee that the surface |
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184 |
is visible. For example, if the surface is behind another surface that has alpha blending |
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enabled the compositor will not do a pixel level comparison to determine surface visibility. |
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@return KErrSurfaceNotRegistered if the surface is not registered with the specific backend. |
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@return KErrNotSupported if global and per-screen update are mixed within the same session. |
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@return KErrNoMemory if the memory is not enough to fulfil the request, any other |
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system error codes. |
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Will panic if applied on disconnected session. |
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191 |
*/ |
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IMPORT_C void NotifyWhenAvailable(TRequestStatus& aStatus); |
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193 |
|
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194 |
/** |
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Ask the server to notify when the surface buffer which will be specified in the next |
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update request has been displayed for the first time. |
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The notification will also include exact time of the event as it is supplied by the |
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User::FastCounter(). |
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199 |
Only the last call of this function before SubmitUpdate command takes place will |
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have effect, i.e. the following call will override the previous one. |
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201 |
|
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@param aStatus Reference to the request status object. |
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@param aTimeStamp Reference to the timestamp of the display notification event, |
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packed into the modified buffer descriptor. |
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Will only be valid if aStatus is equal to KErrNone. |
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206 |
|
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@see RSurfaceUpdateSession::SubmitUpdate |
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208 |
|
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@pre The surface session must be established to the server. |
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@post This request for the display notification event will be transferred to the GCE |
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at next SubmitUpdate command. |
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212 |
|
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@return KErrNone if the surface has been displayed successfully, when request |
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completed aStatus will contain this error code. |
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@return KErrOverflow if the updated buffer was not displayed because it was |
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superseded by a further update on the same surface. |
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@return KErrBackendNotAvailable if backend for specified screen hasn’t been |
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registered with the server. |
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@return KErrArgument if arguments in SubmitUpdate command don’t lie within expected range. |
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@return KErrCancel if notification has been cancelled. It could happen, for instance, |
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if CancelUpdateNotification is called before the request is completed. |
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@return KErrServerBusy if the number of outstanding requests has exceeded specified |
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value (@see RSurfaceUpdateSession::Connect for details). |
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@return KErrNotReady if the environment is in invalid state (for instance, the |
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Surface Update Server has not been launched or session is disconnected). |
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@return KErrNotVisible if the surface specified in SubmitUpdate is not visible. |
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This could happen if there is no layer associated with the surface or no active |
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228 |
composition scene. |
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229 |
For global update it signifies that the surface is not visible for any screen. |
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Note, the absence of this error code does not guarantee that the surface is visible. |
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231 |
For example, if the surface is behind another surface that has alpha blending |
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232 |
enabled the compositor will not do a pixel level comparison to determine surface visibility. |
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@return KErrSurfaceNotRegistered if the surface is not registered with the specific backend. |
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@return KErrNotSupported if global and per-screen update are mixed within the same session. |
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@return ErrNoMemory if the memory is not enough to fulfill the request, otherwise any |
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other system error codes. |
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Will panic if applied on disconnected session. |
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238 |
*/ |
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IMPORT_C void NotifyWhenDisplayed(TRequestStatus& aStatus, TTimeStamp& aTimeStamp); |
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240 |
|
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241 |
/** |
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242 |
Ask the server to notify when the surface buffer which will |
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243 |
be specified in the next update request has been displayed for the X times. |
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<p>Only the last call of this function before SubmitUpdate command takes place |
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will have effect, i.e. the following call will override the previous one. |
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246 |
<p>In case of the global update the notification will always be aligned with the master |
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247 |
display. The SUS will send notification to client when the surface has been displayed on a |
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248 |
master display for the X times or if there is no master display for that surface. |
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249 |
If the master becomes invisible while the request is still in a progress it will be |
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250 |
reassigned to the next visible display with highest priority. |
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251 |
<p>This request will only be associated with the following single call of the SubmitUpdate. |
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252 |
|
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253 |
@param aCount Number of times the surface is displayed before the request is completed. |
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Varies from 1 and greater. |
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255 |
@param aStatus Reference to the request status object. |
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256 |
|
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257 |
@pre The surface session must be established to the server. |
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258 |
@post This request for the display notification event will be transferred to the GCE at |
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259 |
next SubmitUpdate command. |
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260 |
|
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@return KErrNone if the surface has been displayed successfully for specified numbers |
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262 |
of times, when request completed aStatus will contain this error code. |
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@return KErrOverflow if the updated buffer did not remain on-screen for the specified |
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264 |
number of display refreshes because it was superseded by a further update on the |
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265 |
same surface. |
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@return KErrArgument if arguments in SubmitUpdate command don’t lie within expected range. |
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267 |
@return KErrBackendNotAvailable if backend for specified screen hasn’t been registered |
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268 |
with the server. |
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269 |
@return KErrCancel if notification has been cancelled. It could happen, for instance, |
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270 |
if CancelUpdateNotification is called before the request is completed. |
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@return KErrServerBusy if the number of outstanding requests has exceeded |
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272 |
specified value (@see RSurfaceUpdateSession::Connect for details). |
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273 |
@return KErrNotReady if the environment is in invalid state (for instance, the |
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274 |
Surface Update Server has not been launched or session is disconnected). |
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@return KErrNotVisible if the surface specified in SubmitUpdate is not visible. |
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276 |
This could happen if there is no layer associated with the surface or no active |
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277 |
composition scene. |
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278 |
For global update it signifies that the surface is not visible for any screen. |
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279 |
Note, the absence of this error code does not guarantee that the surface is visible. |
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280 |
For example, if the surface is behind another surface that has alpha blending |
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281 |
enabled the compositor will not do a pixel level comparison to determine surface visibility. |
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282 |
@return KErrSurfaceNotRegistered if the surface is not registered with the specific backend. |
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283 |
@return KErrNotSupported if global and per-screen update are mixed within the same session. |
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284 |
@return KErrNoMemory if the memory is not enough to fulfill the request, otherwise |
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285 |
any other system error codes. |
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286 |
Will panic if applied on disconnected session. |
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287 |
*/ |
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288 |
IMPORT_C void NotifyWhenDisplayedXTimes(TInt aCount, TRequestStatus& aStatus); |
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289 |
|
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290 |
/** |
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291 |
Cancel all outstanding requests for notification. |
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292 |
The function doesn't cancel the submit update requests themselves. |
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293 |
|
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@pre The surface session must be established to the server. |
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@post The server will issue request complete immediately for all outstanding requests |
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296 |
related to particular session. |
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297 |
Will panic if applied on disconnected session. |
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*/ |
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IMPORT_C void CancelAllUpdateNotifications(); |
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protected: |
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/** |
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Allow to retrieve the version number. |
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@return client version number |
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*/ |
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TVersion Version() const; |
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private: |
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void IssueRequestComplete(TInt aErr); |
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private: |
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TRequestStatus *iStatusAvailable; |
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TRequestStatus *iStatusDisplayed; |
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TRequestStatus *iStatusDisplayedXTimes; |
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TTimeStamp* iTimeStamp; |
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TInt iCount; |
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}; |
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#endif |