/*  
 * TWAIN Plug-in
 * Copyright (C) 1999 Craig Setera
 * Craig Setera <setera@home.com>
 * 03/31/1999
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *
 * Based on (at least) the following plug-ins:
 * Screenshot
 * GIF
 * Randomize
 *
 * Any suggestions, bug-reports or patches are welcome.
 * 
 * This plug-in interfaces to the TWAIN support library in order
 * to capture images from TWAIN devices directly into GIMP images.
 * The plug-in is capable of acquiring the following type of
 * images:
 * - B/W (1 bit images translated to grayscale B/W)
 * - Grayscale up to 16 bits per pixel
 * - RGB up to 16 bits per sample (24, 30, 36, etc.)
 * - Paletted images (both Gray and RGB)
 *
 * Prerequisites:
 *  This plug-in will not compile on anything other than a Win32
 *  platform.  Although the TWAIN documentation implies that there
 *  is TWAIN support available on Macintosh, I neither have a 
 *  Macintosh nor the interest in porting this.  If anyone else
 *  has an interest, consult www.twain.org for more information on
 *  interfacing to TWAIN.
 *
 * Known problems:
 * - Multiple image transfers will hang the plug-in.  The current
 *   configuration compiles with a maximum of single image transfers.
 */

/* 
 * Revision history
 *  (02/07/99)  v0.1   First working version (internal)
 *  (02/09/99)  v0.2   First release to anyone other than myself
 *  (02/15/99)  v0.3   Added image dump and read support for debugging
 *  (03/31/99)  v0.5   Added support for multi-byte samples and paletted 
 *                     images.
 */

#include <windows.h>
#include "twain.h"
#include "tw_func.h"

/*
 * newSession
 *
 * Create a new TWAIN session.
 */
pTW_SESSION
newSession(pTW_IDENTITY appIdentity) {
  /* Create the structure */
  pTW_SESSION session = g_new (TW_SESSION, 1);

  /* Set the structure fields */
  session->hwnd = 0;
  session->twRC = TWRC_SUCCESS;
  session->appIdentity = appIdentity;
  session->dsIdentity = g_new (TW_IDENTITY, 1);
  session->dsIdentity->Id = 0;
  session->dsIdentity->ProductName[0] = '\0';
  session->transferFunctions = NULL;

  if (twainIsAvailable())
    session->twainState = 2;
  else
    session->twainState = 0;

  return session;
}

/*
 * registerWindowHandle
 *
 * Register the window handle to be used for this
 * session.
 */
void
registerWindowHandle(pTW_SESSION session, HWND hwnd)
{
  session->hwnd = hwnd;
}

/*
 * registerTransferCallback
 *
 * Register the callback to use when transferring
 * image data.
 */
void 
registerTransferCallbacks(pTW_SESSION session, 
			  pTXFR_CB_FUNCS txfrFuncs, 
			  void *clientData)
{
  session->transferFunctions = txfrFuncs;
  session->clientData = clientData;
}

/*
 * setClientData
 *
 * Set the client data associated with the specified
 * TWAIN session.
 */
void
setClientData(pTW_SESSION session, void *clientData)
{
  session->clientData = clientData;
}