graphicshwdrivers/surfacemgr/src/surfacemanager.cpp
author jakl.martin@cell-telecom.com
Mon, 06 Dec 2010 18:07:30 +0100
branchNewGraphicsArchitecture
changeset 218 99b3451c560e
parent 0 5d03bc08d59c
permissions -rw-r--r--
Fix for Bug 3890
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
0
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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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/**
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@file
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@publishedPartner
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@prototype
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*/
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#include "surfacemanager.h"
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#include <e32base.h>
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#include "surfacemanagerdriver.h"
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/**
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Default constructor
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*/
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EXPORT_C RSurfaceManager::RSurfaceManager()
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	{
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	__ASSERT_COMPILE(sizeof(RSurfaceManagerDriver) <= sizeof(iDriverBuf));
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	new(iDriverBuf) RSurfaceManagerDriver();
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	}
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/**
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Opens a connection to the Surface Manager.
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The connection needs to be closed by calling Close() when it is no longer required.
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@return Returns KErrNone if successful, otherwise a system wide error code.
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*/
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EXPORT_C TInt RSurfaceManager::Open()
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	{
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	TInt err = User::LoadLogicalDevice( RSurfaceManagerDriver::Name() );
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	if(! ((KErrNone == err) || (KErrAlreadyExists == err)))
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		{
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		return err;
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		}
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	return Driver().Open();
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	}
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/**
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Closes the connection to the Surface Manager.
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Cleanup is performed by the Surface Manager when a client process exits or
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closes its last connection. It is not guaranteed that the resources held by the
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Surface Manager are going to be released synchronously.
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*/
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EXPORT_C void RSurfaceManager::Close()
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	{
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	Driver().Close();
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	}
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/**
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Returns information specific to the Surface Manager implementation.
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@param aAttrib Attribute to retrieve
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@param aValue Output parameter set to the value for the specified attribute
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@return KErrNone if successful, KErrNotReady if the Surface Manager hasn't been
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opened, KErrArgument if the attribute UID is not recognized, otherwise a system
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wide error code.
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*/
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EXPORT_C TInt RSurfaceManager::GetSurfaceManagerAttrib(TSurfaceManagerAttrib aAttrib, TInt& aValue)
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	{
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	return Driver().GetSurfaceManagerAttrib(aAttrib, aValue);
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	}
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/**
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Opens a surface.
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If the surface is already open in this process, this call increments the
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reference count for the surface for this process. If the surface hasn't been opened
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in this process, it opens the surface in this process and sets the reference count
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to 1 for this process.
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A surface will be deleted when all its reference counts are 0.
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@param aSurfaceId  The surface id originally returned when the surface was created.
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@pre The surface id is for an existing surface.
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@post The surface is open in this process.
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@return KErrNone if successful otherwise a system wide error code.
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*/
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EXPORT_C TInt RSurfaceManager::OpenSurface(const TSurfaceId& aSurfaceId)
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	{
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	return Driver().OpenSurface(aSurfaceId);
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	}
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/**
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Creates a surface and returns its global unique identifier.
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Depending on the implementation, this method will allocate the surface in a new
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shared chunk or in external memory. Surfaces created in external memory cannot
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be mapped (see TSurfaceInfoV01::iMappable for more information). If the creation
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succeeds, the surface will be opened with a reference count of 1 in the calling
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process.
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The Surface Manager implementation should validate at least the following:
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	-	The alignment is 1, 2, 4, 8, 16, 32, 64 or TPageAlignment::EPageAligned.
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	-	The offset to first buffer is correctly aligned.
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	-	The width and height are both greater than zero.
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	-	There is at least one buffer.
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	-	The calculated chunk size isn't so big that it will exceed a signed int.
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	-	The caching attribute is valid
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	-	If the offset between the start of one buffer and the next is specified
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		(not zero), it must be correctly aligned and at least as big as the 
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		buffer size calculated from the height and stride.
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	-	A surface hint key of zero is allowed when creating a surface, it is ignored
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The Surface Manager implementation will treat iStride, iOffsetToFirstBuffer, and
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iOffsetBetweenBuffers as minimum values as opposed to required values. The caller
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of this method must not rely on the passed values as it is not guaranteed that
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they remain the same after surface creation (SurfaceInfo() and GetBufferOffset()
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should be used instead).
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If iOffsetBetweenBuffers is zero, the Surface Manager implementation will layout
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buffer at its own discretion. Although, a buffer's offset must remain constant
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during the surface's lifetime.
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If iMappable is EFalse the surface won't be mappable, hence calls to MapSurface()
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will fail.
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@param aReqs Input parameter, specifies attributes of the surface required.
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@param aSurfaceId Output parameter, the surface ID, set if the call succeeds.
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@pre The Surface Manager has been successfully opened.
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@post The surface is created and opened in the creating process.
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@return KErrNone if it succeeds, KErrArgument if the surface attributes are incorrect,
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KErrNoMemory if the surface cannot be created due to out of memory, KErrOverflow if
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the chunk limit has been exceeded in the moving memory model, otherwise a standard
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Symbian error code.
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*/
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EXPORT_C TInt RSurfaceManager::CreateSurface(const TSurfaceCreationAttributesBuf& aReqs, TSurfaceId& aSurfaceId)
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	{
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	return Driver().CreateSurface(aReqs,aSurfaceId);
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	}
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/**
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Creates a surface in an existing shared chunk specified by the caller and returns
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its global unique identifier.
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If the creation succeeds, the surface will be opened with a reference count of 1 in the calling
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process.
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The Surface Manager implementation should validate at least the following:
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	-	The alignment is 1, 2, 4, 8, 16, 32, 64 or TPageAlignment::EPageAligned.
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	-	The offset to first buffer is correctly aligned.
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	-	The width and height are both greater than zero.
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	-	There is at least one buffer.
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	-	The calculated chunk size isn't so big that it will exceed a signed int.
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	-	The caching attribute is valid
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	-	If the offset between the start of one buffer and the next is specified
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		(not zero), it must be correctly aligned and at least as big as the 
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		buffer size calculated from the height and stride.
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	-	A surface hint key of zero is allowed when creating a surface, it is ignored
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If iOffsetBetweenBuffers is zero, the Surface Manager implementation will layout
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buffer at its own discretion. Although, a buffer's offset must remain constant
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during the surface's lifetime.
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The attributes iContiguous and iCacheAttribute are ignored for existing chunks.
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Also, note that surface manager will not do any rounding for offset to first
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buffer and offset between buffers. It is up to the user, to give exact aligned
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values for this attributes, otherwise surface creation will fail.
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If iMappable is EFalse the surface won't be mappable, hence calls to MapSurface()
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will fail.
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@param aReqs Input parameter, specifies attributes of the surface required.
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@param aSurfaceId Output parameter, the surface ID, set if the call succeeds.
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@param aChunkHandle Handle of the existing shared chunk.
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@pre The Surface Manager has been successfully opened.
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@pre A valid shared chunk exists. The shared chunk type should be Shared Kernel
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multiple and should be right the size, i.e. the size should be calculated as
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Offset to first buffer + (the number of buffers * ((stride * height *
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pixel depth in bytes) rounded up to the specified alignment) all rounded to a page size
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@post The Surface Manager has opened the chunk.
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@post The surface is created and opened in the creating process.
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@return KErrNone if it succeeds, KErrArgument if the surface attributes are incorrect. 
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KErrNotReady if the handle is of an invalid shared chunk memory
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*/ 
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EXPORT_C TInt RSurfaceManager::CreateSurface(const TSurfaceCreationAttributesBuf& aReqs, TSurfaceId& aSurfaceId, const RChunk& aChunkHandle)
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	{
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	return Driver().CreateSurface(aReqs,aSurfaceId,aChunkHandle);
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	}
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/**
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Closes the surface. Decrements the reference count for the surface for the calling
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process.
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If the surface has other owners, it will not be deleted from memory. If this is
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the last process to close the surface, the surface will be deleted and the
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surface ID will become invalid. Resources associated with the surface are not
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guaranteed to be released synchronously.
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@param aSurfaceId The surface identifier originally returned when the surface was created.
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@pre The surface is open.
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@post The surface is closed.
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@return KErrNone if successful, KErrArgument if the surface ID does not refer to a surface,
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KErrAccessDenied if the surface is not open in the current process, otherwise a system wide
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error code.
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*/
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EXPORT_C TInt RSurfaceManager::CloseSurface(const TSurfaceId& aSurfaceId)
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	{
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	return Driver().CloseSurface(aSurfaceId);
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	}
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/**
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Maps the surface into the current client process address space.
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The actual memory will remain mapped into the calling process for as long as
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the RChunk handle aChunk is open.
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Whether or not a surface is mappable is determined at creation time, see 
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TSurfaceCreationAttributes::iMappable.
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The address of the pixel data in buffer N is chunk.Base() + GetBufferOffset(N).
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Surfaces created with existing shared chunks will get the same chunk handle.
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The RChunk handle is owned by the calling thread, so will need to be duplicated
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if passed to other threads in the process.
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@param aSurfaceId The surface identifier originally returned when the surface was created.
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@param aHandle Output parameter, handle to the implementation specific Shared Chunk.
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@pre The surface is open.
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@post The surface memory will be mapped into the calling process's address space.
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The surface is mapped.
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@return KErrNone if successful, KErrArgument if the surface ID does not refer to a
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surface, KErrAccessDenied if the surface is not open in the current process,
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KErrNotSupported if the surface is not mappable, KErrOverflow if the chunk limit has been
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exceeded in the moving memory model, otherwise a system wide error code.
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@see RChunk
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@see RHandleBase::Duplicate
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@see TSurfaceCreationAttributes::iMappable
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*/
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EXPORT_C TInt RSurfaceManager::MapSurface(const TSurfaceId& aSurfaceId, RChunk& aHandle)
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	{
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	return Driver().MapSurface(aSurfaceId,aHandle);
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	}
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/**
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Returns information about a particular surface identified by its surface ID.
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@param aSurfaceId The surface identifier originally returned when the surface
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was created.
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@param aInfo TInfoBuf to receive the information about the surface.
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@pre The surface is open in the calling process.
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@return KErrNone if successful, KErrArgument if the surface ID does not refer to a surface,
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KErrAccessDenied if the surface is not open in the current process, otherwise a system wide
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error code.
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*/
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EXPORT_C TInt RSurfaceManager::SurfaceInfo(const TSurfaceId& aSurfaceId, TInfoBuf& aInfo)
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	{
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	return Driver().SurfaceInfo(aSurfaceId,aInfo);
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	}
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/**
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This function ensures the memory is updated consistently before and/or after
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triggering non CPU hardware access. Also ensures the CPU cache and the physical
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memory are in a consistent state before and after non CPU hardware or DMA access
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to the physical memory.
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@param aSurfaceId The surface identifier originally returned when the surface
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was created.
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@param aBuffer The buffer number indexed from 0 within the surface whose memory
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region is to be flushed. 
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@param aOperation Specifies the sync operation as before non CPU hardware reads
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or before non CPU hardware writes or after non CPU hardware writes between
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physical memory of the surface and the cache contents.
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@pre The surface is open in the calling process.
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@post The surface buffer memory will be synchronized properly with cache contents.
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@return KErrNone if successful, KErrArgument if the surface ID is invalid or
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buffer number is invalid, KErrAccessDenied if the surface is not open in this
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process, otherwise a system wide error code.
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*/ 
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EXPORT_C TInt RSurfaceManager::SynchronizeCache(const TSurfaceId& aSurfaceId, TInt aBuffer, TSyncOperation aOperation)
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	{
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	return Driver().SynchronizeCache(aSurfaceId,aBuffer,aOperation);
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	}
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/**
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Get the surface hint value for the given surface ID and hint pair key.
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@param aSurfaceId  The surface identifier originally returned when the surface
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was created.
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@param aHint The hint value for the requested hint pair key.
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@pre The surface is open in the calling process.
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@pre Hint key should be a key for a hint set for this surface.
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@post The hint value will be updated in the hint pair.
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@return KErrNone if successful, KErrArgument if the surface ID is invalid or
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invalid hint pair key used, KErrAccessDenied if the surface is not open in the
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current process, otherwise a system wide error code.
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*/ 
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EXPORT_C TInt RSurfaceManager::GetSurfaceHint(const TSurfaceId& aSurfaceId, THintPair& aHint)
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	{
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	return Driver().GetSurfaceHint(aSurfaceId,aHint);
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	}
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/**
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Set the surface hint value for the surface ID.
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@param aSurfaceId The surface identifier originally returned when the surface
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was created.
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@param aHint The value of the hint pair to set.
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@pre The surface is open in the calling process.
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@pre The hint key should be a key for a hint set for this surface.
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@pre Only mutable hints can be updated.
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@post The hint value will be updated in the surface hint pair.
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@return KErrNone if successful, KErrArgument if the surface ID is invalid or if invalid
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hint key used, KErrAccessDenied if the hint pair is immutable or the surface is not open
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in the current process, otherwise a system wide error code.
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*/
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EXPORT_C TInt RSurfaceManager::SetSurfaceHint(const TSurfaceId& aSurfaceId, const THintPair& aHint)
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	{
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	return Driver().SetSurfaceHint(aSurfaceId,aHint);
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	}
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/**
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Adds a new surface hint to the surface.
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This function will fail if the surface already has its maximum number of hints 
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or if the hint key is a duplicate or invalid.
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@param aSurfaceId The surface identifier originally returned when the surface
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was created.
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@param aHint The value of the hint pair to add.
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@pre The surface is open in the calling process.
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@pre At least one free space to add a hint pair.
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@pre The new hint key should be non zero and unique for this surface.
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@post New hint pair will be added in the surface.
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@return Returns KErrNone if successful, KErrArgument if the surface ID is invalid or the
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hint pair has invalid key UID, KErrAccessDenied if the surface is not open in the current
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process, KErrAlreadyExists if duplicate hint key used, KErrOverflow if no space to add new
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pair, otherwise a system wide error code.
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*/
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EXPORT_C TInt RSurfaceManager::AddSurfaceHint(const TSurfaceId& aSurfaceId, const THintPair& aHint)
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	{
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	return Driver().AddSurfaceHint(aSurfaceId,aHint);
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	}
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/**
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Get the offset of the specified buffer from the base address of the underlying
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chunk.
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To obtain the address of the buffer, the offset returned must be added onto the
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base address of the RChunk returned in a call to MapSurface(). Note that
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buffer offsets are immutable during the lifetime of the surface.
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@param aSurfaceId The surface identifier originally returned when the surface
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was created.
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@param aBuffer The buffer for which the offset is requested. Indexed from 0.
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@param aOffset Output parameter set to the offset within the chunk.
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@pre The surface is open in the calling process.
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@return KErrNone if successful, KErrArgument if aSurfaceId or aBuffer are invalid,
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KErrAccessDenied if the surface is not open in the current process, KErrNotSupported if
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the surface is not mappable, otherwise a system wide error code.
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*/
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EXPORT_C TInt RSurfaceManager::GetBufferOffset(const TSurfaceId& aSurfaceId, TInt aBuffer, TInt& aOffset)
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	{
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	return Driver().GetBufferOffset(aSurfaceId, aBuffer, aOffset);
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	}
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/**
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Get a reference of the implementation of the surface manager.
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@return reference of the implementation of the surface manager
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*/
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inline RSurfaceManagerDriver& RSurfaceManager::Driver()
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	{
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	return reinterpret_cast<RSurfaceManagerDriver&>(*iDriverBuf);
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	}
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