ai_layer.cpp

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// $Id: ai_layer.cpp 1282 2006-06-09 09:46:49Z alex $
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 */
#include "camtypes.h"
//#include "ccobject.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "ai5_eps.h"
#include "ai_layer.h"

CC_IMPLEMENT_DYNAMIC ( AILayerProcessor, CCObject )

/********************************************************************************************

>   AILayerProcessor::AILayerProcessor ( void )

    Author:     Graeme_Sutherland (Xara Group Ltd) <camelotdev@xara.com>
    Created:    16/4/00
    Purpose:    Default constructor.
    SeeAlso:    AILayerProcessor::~AILayerProcessor ()

********************************************************************************************/

AILayerProcessor::AILayerProcessor ( void )
{
    // Initialise all member variables to their default state.
    mLayerName.Empty ();            // Clear the layer name string.
    mIsLocked       = FALSE;        // Set the layer locked flag to FALSE.
    mIsPrintable    = FALSE;        // Set the layer printable flag to FALSE.
    mIsVisible      = FALSE;        // Set the layer visible flag to FALSE.
}

/********************************************************************************************

>   AILayerProcessor::~AILayerProcessor ( void )

    Author:     Graeme_Sutherland (Xara Group Ltd) <camelotdev@xara.com>
    Created:    16/4/00
    Purpose:    Default destructor.
    SeeAlso:    AILayerProcessor::AILayerProcessor ()

********************************************************************************************/

AILayerProcessor::~AILayerProcessor ( void )
{
    // Nothing needs to be done.
}

/********************************************************************************************

>   BOOL AILayerProcessor::DecodeAI5Lb ( AI5EPSFilter   &Filter )

    Author:     Graeme_Sutherland (Xara Group Ltd) <camelotdev@xara.com>
    Created:    16/4/00
    Inputs:     pFilter - A pointer to the AI5EPSFilter being used for the export.
    Returns:    TRUE    - Success.
                FALSE   - An error has occurred.
    Purpose:    Extracts the layer information from the Lb record. The AI file format allows
                for more fine-grained control over the layers than the Camelot version, and
                so much of it is rejected.
    SeeAlso:    AILayerProcessor::DecodeLB (), AILayerProcessor::DecodeLn (),
                AI5EPSFilter::ProcessToken()

********************************************************************************************/

BOOL AILayerProcessor::DecodeAI5Lb ( AI5EPSFilter   &Filter )
{
    INT32   IsVisible   = 0;
    INT32   IsLocked    = 0;
    INT32   IsPrintable = 0;
    
    // Pop the information off the stack.
    if ( !Filter.GetStack ().Discard ( 6 )          ||  // Discard the unused data on the stack.
         !Filter.GetStack ().Pop ( &IsPrintable )   ||  // Extract whether it's printable.
         !Filter.GetStack ().Pop ( &IsLocked )      ||  // Extract whether the layer is locked.
         !Filter.GetStack ().Discard ( 1 )          ||  // Discard the unused flag.
         !Filter.GetStack ().Pop ( &IsVisible ) )       // Extract the layer visibility data.
    {
        // There has been a problem extracting the data. Return a FALSE value to inform the
        // AIEPS filter.
        return FALSE;
    }

    // Set up the layer state flags from the information in the Lb operator. The default
    // state is false, so only one branch needs to be evaluated.
    if ( !IsLocked )
    {
        mIsLocked       = TRUE;                         // Set the layer locked flag to TRUE.
    }

    if ( IsPrintable )
    {
        mIsPrintable    = TRUE;                         // Set the printable flag to TRUE.
    }
    
    if ( IsVisible )
    {
        mIsVisible      = TRUE;                         // Set the visible flag to TRUE.
    }

    // Success.
    return TRUE;
}

/********************************************************************************************

>   BOOL AILayerProcessor::DecodeAI8Lb ( AI5EPSFilter   &Filter )

    Author:     Graeme_Sutherland (Xara Group Ltd) <camelotdev@xara.com>
    Created:    16/4/00
    Inputs:     pFilter - A pointer to the AI5EPSFilter being used for the export.
    Returns:    TRUE    - Success.
                FALSE   - An error has occurred.
    Purpose:    The syntax of the Lb operator has changed in AI8, and this function is
                intended to handle the newer version.
    SeeAlso:    AILayerProcessor::DecodeAI5Lb (), AILayerProcessor::DecodeLB ()
                AILayerProcessor::DecodeLn (), AI8EPSFilter::ProcessToken ()

********************************************************************************************/

BOOL AILayerProcessor::DecodeAI8Lb ( AI5EPSFilter   &Filter )
{
    INT32   IsVisible   = 0;
    INT32   IsLocked    = 0;
    INT32   IsPrintable = 0;
    
    // Pop the information off the stack.
    if ( !Filter.GetStack ().Discard ( 9 )          ||  // Discard the unused data on the stack.
         !Filter.GetStack ().Pop ( &IsPrintable )   ||  // Extract whether it's printable.
         !Filter.GetStack ().Pop ( &IsLocked )      ||  // Extract whether the layer is locked.
         !Filter.GetStack ().Discard ( 1 )          ||  // Discard the unused flag.
         !Filter.GetStack ().Pop ( &IsVisible ) )       // Extract the layer visibility data.
    {
        // There has been a problem extracting the data. Return a FALSE value to inform the
        // AIEPS filter.
        return FALSE;
    }

    // Set up the layer state flags from the information in the Lb operator. The default
    // state is false, so only one branch needs to be evaluated.
    if ( !IsLocked )
    {
        mIsLocked       = TRUE;                         // Set the layer locked flag to TRUE.
    }

    if ( IsPrintable )
    {
        mIsPrintable    = TRUE;                         // Set the printable flag to TRUE.
    }
    
    if ( IsVisible )
    {
        mIsVisible      = TRUE;                         // Set the visible flag to TRUE.
    }

    // Success.
    return TRUE;
}

/********************************************************************************************

>   BOOL AILayerProcessor::DecodeLB ( AI5EPSFilter  &Filter )

    Author:     Graeme_Sutherland (Xara Group Ltd) <camelotdev@xara.com>
    Created:    16/4/00
    Inputs:     pFilter - A pointer to the AI5EPSFilter being used for the export.
    Returns:    TRUE    - Success.
                FALSE   - An error has occurred.
    Purpose:    Processes the LB command, which is the end of layer indicator.
    SeeAlso:    AILayerProcessor::DecodeLb (), AI5EPSFilter::ProcessToken()

********************************************************************************************/

BOOL AILayerProcessor::DecodeLB ( AI5EPSFilter  &Filter )
{
    // Push the insert point in the tree up a level, so that any future layers are inserted
    // in the correct place. This is done automatically by the EPSFilter class, so this
    // method is redundant.
    return TRUE;
}

/********************************************************************************************

>   BOOL AILayerProcessor::DecodeLn ( AI5EPSFilter  &Filter )

    Author:     Graeme_Sutherland (Xara Group Ltd) <camelotdev@xara.com>
    Created:    16/4/00
    Inputs:     pFilter - A pointer to the AI5EPSFilter being used for the export.
    Returns:    TRUE    - Success.
                FALSE   - An error has occurred.
    Purpose:    Processes the Ln command, which is used to set the layer's name.
    SeeAlso:    AILayerProcessor::DecodeLb (), AI5EPSFilter::ProcessToken()

********************************************************************************************/

BOOL AILayerProcessor::DecodeLn ( AI5EPSFilter  &Filter )
{
    // Pop the layer's name off the stack, and store it in the mLayerName member variable.
    if ( !Filter.GetStack ().Pop ( &mLayerName ) )
    {
        // There's been a problem, so inform the filter that invoked this command.
        return FALSE;
    }

    // Create a new layer using the stored information.
    return Filter.CreateLayer ( mLayerName, mIsLocked, mIsPrintable, mIsVisible );
}

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