/*

    File:       GDevice.cp

    Contains:   TGDevice is a GDevice utility class, finding out GDevice information.

                GDevice.cp contains the class body information for the TGDevice class.

    Written by: Kent Sandvik    

    Copyright:  Copyright © 1991-1999 by Apple Computer, Inc., All Rights Reserved.

                You may incorporate this Apple sample source code into your program(s) without

                restriction. This Apple sample source code has been provided "AS IS" and the

                responsibility for its operation is yours. You are not permitted to redistribute

                this Apple sample source code as "Apple sample source code" after having made

                changes. If you're going to re-distribute the source, we require that you make

                it clear in the source that the code was descended from Apple sample source

                code, but that you've made changes.

    Change History (most recent first):

                8/18/1999   Karl Groethe    Updated for Metrowerks Codewarror Pro 2.1

*/

// Include files

#ifndef _GDEVICE_

#include "GDevice.h"

#endif

// _________________________________________________________________________________________________________ //

// TGDevice class member function implementations

//  CONSTRUCTORS & DESTRUCTORS

#pragma segment GDevice                  

TGDevice::TGDevice()

// The default constructor will just call the IGDevice method which will search

// and hopefully find the GDList (if not the fStatus is false in the class).

{

    fFirstTime = true;                          // indicate we are inside the constructor

    fLast = false;                              // no wrap yet (constructor time)

    Boolean fState = this->IGDevice();          // initialize the object

    fFirstTime = false;                         // out, we are no longer in a cvt

    fFirstGDList = fGDList;                     // record the first in the list

}

#pragma segment GDevice

TGDevice::~TGDevice()

// Destructor, we are not doing anything inside this one just now.

{

}

//  INITIATION ROUTINES

#pragma segment GDevice

Boolean TGDevice::IGDevice()

// Look for the GDList, return true if found, false if not.

{

    if (fFirstTime)                             // first time we are critical about NULL!

    {

        fGDList = ::GetDeviceList();            // get the device list

        ASSERT(fGDList != NULL, "\pGetDeviceList returned NULL");

        this->GetGDeviceValues();               // fill in the proper values ASAP

        if (fGDList == NULL)                    // we had a problem

            goto IGDeviceFalse;

        else

            goto IGDeviceOK;                    // OK

    }

    else                                        // we are now called from Next, OK with NULL

        {

            fGDList = ::GetNextDevice(fGDList); // continue the iteration

            if (fGDList == NULL)                // beyond the last one?

            {

                fGDList = fFirstGDList;         // back to the first one

                fLast = true;                   // signal this was the last one

                goto IGDeviceOK;

            }

            goto IGDeviceOK;                    // OK anyway!

        }

IGDeviceFalse:return false;

IGDeviceOK:return true;

}

#pragma segment GDevice                  

void TGDevice::Next()

// Gets the information from the following devices.

{

    this->IGDevice();

    this->GetGDeviceValues();

}

#pragma segment GDevice                  

void TGDevice::First()

// Reset to the first GDevice we found.

{

    fGDList = fFirstGDList;

}

#pragma segment GDevice                  

Ptr TGDevice::GetBase() const

// Return the pointer of the GDevice base, not the address (more flexible that way)

{

    return fBase;

}

#pragma segment GDevice                  

long TGDevice::GetRow() const

// Return row value.

{

    return fRow;

}

#pragma segment GDevice                  

short TGDevice::GetDepth() const

// Return the depth level of the GDevice.

{

    return fDepth;

}

#pragma segment GDevice                  

Boolean TGDevice::Last() const

// Just return the Boolean value if this was the last GDevice or not.

{

    return fLast;

}

//  PRIVATE MEMBER FUNCTIONS

#pragma segment GDevice

void TGDevice::GetGDeviceValues()

// Get the GDevice information from the GDList device

{

    fBase = (*(*fGDList)->gdPMap)->baseAddr;

    fRow = (*(*fGDList)->gdPMap)->rowBytes;

    fRow = fRow & 0x0000FFFF;

    fDepth = (*(*fGDList)->gdPMap)->pixelSize;

    fDepth = fDepth & 0x0000FFFF;

}

// _________________________________________________________________________________________________________ //

/*  Change History (most recent last):

  No        Init.   Date        Comment

  1         khs     6/2/92      New file

  2         khs     7/5/92      First decent release

  3         khs     9/7/92      More hacking for multi-dev platform use

*/