jpgprgrs.cpp

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// $Id: jpgprgrs.cpp 1282 2006-06-09 09:46:49Z alex $
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               Xara LX, a vector drawing and manipulation program.
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----------------------------------

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 */
// 


#include "camtypes.h"
//#include "filters.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "progress.h"

#include "jinclude.h"
#include "jpeglib.h"
#include "jpgprgrs.h"



// Place any IMPLEMENT type statements here
//CC_IMPLEMENT_MEMDUMP(CCWobJob, CC_CLASS_MEMDUMP)


// We want better memory tracking
#define new CAM_DEBUG_NEW


// Functions follow


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

>   JPEGProgressMonitor::JPEGProgressMonitor(j_decompress_ptr cinfo)

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    02/08/96
    Inputs:     cinfo : the structure provided by the IJG library
    Purpose:    Derived classes should call this prior to their own construction to construct
                a safe base class.
    Scope:      protected

********************************************************************************************/
JPEGProgressMonitor::JPEGProgressMonitor(j_decompress_ptr cinfo)
{
    // Set "base class" member...
    progress_monitor = Update;

    m_pcinfo            = cinfo;
    m_bContinueOp       = TRUE;
}


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

>   JPEGProgressMonitor::~JPEGProgressMonitor()

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    02/08/96
    Purpose:    Provides bizarre pure implementation for derived class destructors
    Scope:      protected

********************************************************************************************/
JPEGProgressMonitor::~JPEGProgressMonitor()
{
}


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

>   void JPEGProgressMonitor::Update(j_common_ptr cinfo)

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    02/08/96
    Inputs:     cinfo : data provided by the IJG Library
    Purpose:    Callback function for the IJG library.
                It updates the Camelot Progress bar
    Scope:      static
    Notes:      This member is static because the IJG library is written in C, so requiring
                classless pointers to functions

********************************************************************************************/
void JPEGProgressMonitor::Update(j_common_ptr cinfo)
{
    JPEGProgressMonitor* pThis = (JPEGProgressMonitor*) cinfo->progress;
    pThis->OnUpdate();
}





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

>   JPEGProgressBySelf::JPEGProgressBySelf(j_decompress_ptr cinfo, 
                                            const StringBase& BarString)

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    02/08/96
    Inputs:     BarString: a reference to the string to be used on the progress bar during
                the time-consuming operation
    Purpose:    Constructor for a class providing a progress callback to the IJG Library
                JPEG filter.
    Notes:      A progress bar will be constructed via this constructor.
    See Also:   JPEGProgressByFilter

********************************************************************************************/
JPEGProgressBySelf::JPEGProgressBySelf(j_decompress_ptr cinfo, const StringBase& BarString)
    : JPEGProgressMonitor(cinfo)
{
    m_BarString         = BarString;
    m_uLastPercentDone  = 0;

    // Create a new progress bar. Actually not that bothered if it doesn't construct
    m_pProgressBar      = new Progress(&m_BarString, 100);
}


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

>   JPEGProgressBySelf::~JPEGProgressBySelf()

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    02/08/96
    Purpose:    Destructor - stops the progress bar
    Notes:      Derived classes should call this subsequent to any specialized destruction
                code of their own.

********************************************************************************************/
JPEGProgressBySelf::~JPEGProgressBySelf()
{
    // If started, then stop then progress bar
    if (m_pProgressBar != NULL)
    {
        delete m_pProgressBar;
        m_pProgressBar = NULL;
    }
}


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

>   virtual void JPEGProgressBySelf::OnUpdate()

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    02/08/96
    Purpose:    Called by JPEGProgressMonitor::Update() to provide feedback on the filter
                progress. Derived classes should provide an implementation for this.
                JPEGProgressBySelf calls the contained Progress::Update member with the
                percentage done.

********************************************************************************************/
void JPEGProgressBySelf::OnUpdate()
{
    /*
        Fraction done =

            completed_passes + (pass_counter/pass_limit)
            --------------------------------------------
                        total_passes
    */
    UINT32 PercentDone = (UINT32) (100L * completed_passes + (100L * pass_counter) / pass_limit)
                            / total_passes;

    // Update the progress count, if required
    // but don't bother if the user aborted
    if (PercentDone != m_uLastPercentDone && m_bContinueOp)
    {
        m_bContinueOp = m_pProgressBar->Update(PercentDone);
        m_uLastPercentDone = PercentDone;
    }
}





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

>   JPEGProgressByFilter::JPEGProgressByFilter(j_decompress_ptr cinfo, Filter* pFilterToUse,
                                                UINT32 Increment);

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    02/08/96
    Inputs:     cinfo : the structure provided by the IJG library
                pFilterToUse : a pointer to a Filter with an IncProgressBarCount(UINT32 ...) 
                member, which will be called with an update of the percentage progress made.
                ImportSize : the size of the file we are importing

    Purpose:    Constructor for a class providing a progress callback to the IJG Library
                JPEG filter.
    Notes:      No progress bar will be constructed via this constructor. The given filter
                is expected to provide one.
    See Also:   JPEGProgressBySelf

********************************************************************************************/
JPEGProgressByFilter::JPEGProgressByFilter(j_decompress_ptr cinfo, Filter* pFilterToUse,
                        UINT32 ImportSize)
    : JPEGProgressMonitor(cinfo)
{
    m_pFilterForUpdate  = pFilterToUse;
    m_uLastScanLineDone = 0;
    m_uImportSize = ImportSize;
}


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

>   virtual void JPEGProgressByFilter::OnUpdate()

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    02/08/96
    Purpose:    Called by JPEGProgressMonitor::Update() to provide feedback on the filter
                progress. Derived classes should provide an implementation for this.
                JPEGProgressByFilter calls the contained Filter's Update member with the
                number of scanlines processed.

********************************************************************************************/
void JPEGProgressByFilter::OnUpdate()
{
    INT32 Difference = m_pcinfo->output_scanline - m_uLastScanLineDone;
    if (Difference > 0)
    {
        UINT32 PerLineIncrement = m_uImportSize / m_pcinfo->output_height;
        m_pFilterForUpdate->IncProgressBarCount(Difference * PerLineIncrement);
        m_uLastScanLineDone += Difference;
    }
}

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