pngprgrs.cpp

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// $Id: pngprgrs.cpp 751 2006-03-31 15:43:49Z alex $
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 */

// PNG progress bar code
// Jonathan Payne 8/2000

#include "camtypes.h"
#include "png.h"
#include "pngprgrs.h"
#include "progress.h"       // For hourglass stuff

// An implement to match the Declare in the .h file.
CC_IMPLEMENT_MEMDUMP(PNGProgressBar, CC_CLASS_MEMDUMP)

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

>   PNGProgressBar::PNGProgressBar(String_64 *ProgressString, bool new_interlaced, UINT32 new_height)

    Author:     Jonathan_Payne (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30/8/2000
    Inputs:     ProgressString
    Outputs:    Progress bar on screen
    Returns:    void
    Purpose:    Constructor.  Sets show_progress_bar.  If ProgressString != NULL, starts
                prorgress bar.
    Scope:      Public

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

PNGProgressBar::PNGProgressBar(String_64 *ProgressString, bool new_interlaced, UINT32 new_height)
{
    interlaced = new_interlaced;
    height = new_height;

    if (ProgressString != NULL)
    {
        show_progress_bar = true;
        if (interlaced)
        // An interlaced image
        {
            // PNG interlaced files always have 7 passes so use 7 as
            // final value for status bar
            BeginSlowJob(8, FALSE, ProgressString);

            // Next update the status bar at pass 0
            next_update = 0;
        }
        else
        // A non-interlaced image
        {
            BeginSlowJob(height, FALSE, ProgressString);
            
            // Update the status bar on row 0
            next_update = 0;
        }
    }
    else
    {
        show_progress_bar = false;
    }
}

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

>   PNGProgressBar::~PNGProgressBar()

    Author:     Jonathan_Payne (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30/8/2000
    Outputs:    Removes progress bar from screen
    Returns:    void
    Purpose:    Constructor.  Sets show_progress_bar.  If ProgressString != NULL, starts
                prorgress bar.
    Scope:      Public

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

PNGProgressBar::~PNGProgressBar()
{
    // If started, then stop then progress bar
    if (show_progress_bar)
        EndSlowJob();
}

void PNGProgressBar::UpdateCallback(png_structp png_ptr, png_uint_32 row_number, INT32 pass)
{
    if (show_progress_bar)
    {
        if (interlaced)
        // Interlaced image
        {
            if (pass + 1 >= next_update)
                ContinueSlowJob(pass + 1);
        }
        else
        // Non-interlaced image
        {
            if ((INT32)row_number >= next_update)
                ContinueSlowJob(row_number);
        }
    }
}

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