guestrendering/vghwserialiser/inc/requestbuffer.h
author Matt Plumtree <matt.plumtree@nokia.com>
Thu, 16 Sep 2010 12:38:21 +0100
branchbug235_bringup_0
changeset 22 b801ed730c0a
parent 1 d8d95053303a
permissions -rwxr-xr-x
Minor fix ups for serialiser code, when built for host side
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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// Copyright (c) 2010 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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#ifndef REQUEST_BUFFER_H_
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#define REQUEST_BUFFER_H_
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#include "serializerplatform.h"
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/*
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 * Base for ring buffer users
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 */
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class MRequestBufferBookKeepingBase
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    {
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public:
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    virtual TUint32 GetWriteCount() = 0;
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    virtual TUint32 GetReadCount() = 0;
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    virtual TUint32 BufferTail() = 0;
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    };
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/*
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 * Ring buffer writer. Data source for ring buffer.
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 */
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class MRequestBufferBookKeepingWriter: public MRequestBufferBookKeepingBase
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    {
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public:
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    virtual TUint32 BufferHead() = 0;
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    virtual void SetBufferHead( TUint32 aIndex ) = 0;
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    virtual void IncrementWriteCount( TUint32 aWriteCount ) = 0;
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    virtual void SetMaxTailIndex( TUint32 aIndex ) = 0;
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    };
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/*
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 * Ring buffer reader. Data consumer for ring buffer.
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 */
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class MRequestBufferBookKeepingReader: public MRequestBufferBookKeepingBase
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    {
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public:
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    virtual void SetBufferTail( TUint32 aIndex ) = 0;
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    virtual void IncrementReadCount( TUint32 aReadCount ) = 0;
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    virtual TUint32 MaxTailIndex() = 0;
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    };
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class RequestBufferBase
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    {
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public:
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    /*
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     * 
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     */
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    static TUint32 AdjustAlignment( TUint32 aIndex, const TUint32 aAlignment )
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    {
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    const TUint32 remainder = aIndex % aAlignment;
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    if ( remainder )
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        {
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        aIndex += aAlignment - remainder;
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        }
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    return aIndex;
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    }
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protected:
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    /*
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     * 
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     */
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    RequestBufferBase( TUint32 aSize ):
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        iSize( aSize )
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        {}
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protected:
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    const TUint32 iSize;
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    };
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class RequestBufferWriter: RequestBufferBase
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    {
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public:
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    /*
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     * 
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     */
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    RequestBufferWriter( MRequestBufferBookKeepingWriter& aBookKeeper, TUint32 aSize ): 
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        RequestBufferBase( aSize ),
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        iBookKeeper( aBookKeeper )
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    96
        {}
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    97
    
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    98
    /*
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    99
     * 
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   100
     */
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   101
    void InitBuffer()
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   102
        {
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   103
        iBookKeeper.SetBufferHead( 0 );    
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   104
        iBookKeeper.SetMaxTailIndex( iSize );
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   105
        }
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   106
    
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   107
    /*
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   108
     * Does not check for free space, assure free space by using CheckForSpace
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   109
     */
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   110
    TUint32 AllocateBytes( const TUint32 aBytes )
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   111
        {
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   112
        TUint32 base = iBookKeeper.BufferHead();
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   113
        if ( base + aBytes > iSize )
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   114
            {
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   115
            iBookKeeper.SetMaxTailIndex( base );
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   116
            base = 0;
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   117
            }
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   118
        else if ( iBookKeeper.BufferTail() <= base )
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   119
            {
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   120
            iBookKeeper.SetMaxTailIndex( iSize );
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   121
            }
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   122
        return base;
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   123
        }
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   124
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   125
    /*
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   126
     * Does not check for free space, assure free space by using CheckForSpace
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   127
     */
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   128
    void CommitBytes( const TUint32 aBase, const TUint32 aBytes )
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   129
        {
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   130
        //TUint32 base = CheckIndexForWrapAround( AdjustAlignment( aBase + aBytes, 4 ) );
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   131
        TUint32 base = AdjustAlignment( aBase + aBytes, 4 );
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   132
		const TUint32 inc( base - aBase );
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   133
        iBookKeeper.SetBufferHead( base );
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   134
        iBookKeeper.IncrementWriteCount( inc );
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   135
        }
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   136
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   137
    /*
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   138
     * 
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   139
     */
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   140
    TBool CheckForSpace( const TUint32 aSpaceNeeded )
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   141
        {
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   142
        const TUint32 inputBufferHead( iBookKeeper.BufferHead() );
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   143
        const TUint32 inputBufferTail( iBookKeeper.BufferTail() );
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   144
        //Notice that tail might grow during the execution of this function
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   145
        // but it would only cause false negative as a result
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parents:
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   146
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   147
        //Buffer can be empty or full
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   148
        if ( inputBufferHead == inputBufferTail )
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   149
            {
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   150
            //Check if the buffer is full or empty
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   151
            if ( iBookKeeper.GetWriteCount() - iBookKeeper.GetReadCount() )
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   152
                {
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   153
                //Buffer is full
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   154
                return EFalse;
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   155
                }
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   156
            }
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
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   157
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
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   158
        //Let's check if the SFC fits to the buffer
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   159
        const TUint32 newHeadIndex = inputBufferHead + aSpaceNeeded;// + alignmentAdjust;
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
diff changeset
   160
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
diff changeset
   161
        if ( inputBufferHead < inputBufferTail && newHeadIndex > inputBufferTail )
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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diff changeset
   162
            {
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
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   163
            //Buffer does not have enough space
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parents:
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   164
            return EFalse; 
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   165
            }
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
diff changeset
   166
        else if ( inputBufferHead >= inputBufferTail )
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
diff changeset
   167
            {
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
diff changeset
   168
            if ( newHeadIndex > iSize && aSpaceNeeded > inputBufferTail )
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   169
                {
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
diff changeset
   170
                //Buffer does not have enough space
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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diff changeset
   171
                return EFalse;
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   172
                }
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   173
            }
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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diff changeset
   174
        return ETrue;        
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   175
        }
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
diff changeset
   176
    
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   177
private:
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   178
    MRequestBufferBookKeepingWriter& iBookKeeper;
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   179
    };
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
diff changeset
   180
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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diff changeset
   181
class RequestBufferReader: public RequestBufferBase
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   182
    {
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   183
public:
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   184
    /*
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parents:
diff changeset
   185
     * 
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parents:
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   186
     */
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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parents:
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   187
    RequestBufferReader( MRequestBufferBookKeepingReader& aBookKeeper, TUint32 aSize ): 
d8d95053303a Bootstrap the guestvideodriver and sghwserialiser. Some stuff is still commented out. Compiles with graphics package at changeset 8d47cca9cc11
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   188
        RequestBufferBase( aSize ),
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parents:
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   189
        iBookKeeper( aBookKeeper )
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        {}
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    /*
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     * 
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     */
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    void InitBuffer()
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        {
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        iBookKeeper.SetBufferTail( 0 );
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        }
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    /*
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     * 
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     */
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    TUint32 GetReadIndex()
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        {
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		const TUint32 bufTail( iBookKeeper.BufferTail() );
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		const TUint32 bufTail2( CheckIndexForWrapAround( bufTail ) );
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        if ( bufTail != bufTail2 )
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			{
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			iBookKeeper.SetBufferTail( bufTail2 );
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			}
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		return bufTail2;
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        }
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    /*
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     * 
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     */
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    void FreeBytes( TUint32 aBytes )
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        {
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		const TUint32 oldTail(iBookKeeper.BufferTail());
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        TUint32 newBufferTail = AdjustAlignment( aBytes + oldTail, 4 );
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		const TUint32 inc( newBufferTail - oldTail );
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        newBufferTail = CheckIndexForWrapAround( newBufferTail );
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        iBookKeeper.IncrementReadCount( inc );
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        iBookKeeper.SetBufferTail( newBufferTail );
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        }
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    /*
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     * 
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     */
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    TBool IsDataAvailable()
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        {
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		const TUint32 readc( iBookKeeper.GetReadCount() );
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		const TUint32 writec( iBookKeeper.GetWriteCount() );
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        return readc != writec;
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        }   
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    /*
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     * 
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     */
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    TUint32 CheckIndexForWrapAround( TUint32 aIndex )
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        {
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        //Head is behind of tail when MaxTailIndex is applied so
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        // this routine works for head, too
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        if ( aIndex >= iBookKeeper.MaxTailIndex() )
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            {
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            return 0;
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            }
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        return aIndex;
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        }
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private:
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    MRequestBufferBookKeepingReader& iBookKeeper;
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    };
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#endif