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PIKApp/plug-ins/twain/twain.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/*
* TWAIN Plug-in
* Copyright (C) 1999 Craig Setera
* Craig Setera <setera@home.com>
* 03/31/1999
*
* Updated for Mac OS X support
* Brion Vibber <brion@pobox.com>
* 07/22/2004
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*
*
* 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 PIKA 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:
* Should compile and run on both Win32 and Mac OS X 10.3 (possibly
* also on 10.2).
*
* Known problems:
* - Multiple image transfers will hang the plug-in. The current
* configuration compiles with a maximum of single image transfers.
* - On Mac OS X, canceling doesn't always close things out fully.
* - Epson TWAIN driver on Mac OS X crashes the plugin when scanning.
*/
/*
* 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.
* (07/23/04) v0.6 Added Mac OS X support.
*/
#include "config.h"
#include <glib.h> /* Needed when compiling with gcc */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tw_platform.h"
#include "tw_local.h"
#include "libpika/pika.h"
#include "libpika/stdplugins-intl.h"
#include "tw_func.h"
#include "tw_util.h"
#ifdef _DEBUG
#include "tw_dump.h"
#endif /* _DEBUG */
/*
* Plug-in Definitions
*/
#define PLUG_IN_NAME "twain-acquire"
#define PLUG_IN_DESCRIPTION _("Capture an image from a TWAIN datasource")
#define PLUG_IN_HELP N_("This plug-in will capture an image from a TWAIN datasource")
#define PLUG_IN_AUTHOR "Craig Setera (setera@home.com)"
#define PLUG_IN_COPYRIGHT "Copyright 2004 by Craig Setera"
#define PLUG_IN_VERSION "v0.6 (07/22/2004)"
#ifdef _DEBUG
#define PLUG_IN_D_NAME "twain-acquire-dump"
#define PLUG_IN_R_NAME "twain-acquire-read"
#endif /* _DEBUG */
/*
* Application definitions
*/
#define MAX_IMAGES 1
/*
* Definition of the run states
*/
#define RUN_STANDARD 0
#define RUN_DUMP 1
#define RUN_READDUMP 2
/* Global variables */
pTW_SESSION twSession = NULL;
#ifdef _DEBUG
static int twain_run_mode = RUN_STANDARD;
#endif
/* Forward declarations */
void preTransferCallback (void *clientData);
int beginTransferCallback (pTW_IMAGEINFO imageInfo,
void *clientData);
int dataTransferCallback (pTW_IMAGEINFO imageInfo,
pTW_IMAGEMEMXFER imageMemXfer,
void *clientData);
int endTransferCallback (int completionState,
int pendingCount,
void *clientData);
void postTransferCallback (int pendingCount,
void *clientData);
typedef struct _Twain Twain;
typedef struct _TwainClass TwainClass;
struct _Twain
{
PikaPlugIn parent_instance;
};
struct _TwainClass
{
PikaPlugInClass parent_class;
};
#define TWAIN_TYPE (twain_get_type ())
#define TWAIN (obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), TWAIN_TYPE, Twain))
GType twain_get_type (void) G_GNUC_CONST;
static GList * twain_query_procedures (PikaPlugIn *plug_in);
static PikaProcedure * twain_create_procedure (PikaPlugIn *plug_in,
const gchar *name);
static PikaValueArray * twain_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
const PikaValueArray *args,
gpointer run_data);
G_DEFINE_TYPE (Twain, twain, PIKA_TYPE_PLUG_IN)
PIKA_MAIN (TWAIN_TYPE)
DEFINE_STD_SET_I18N
static void
twain_class_init (TwainClass *klass)
{
PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = twain_query_procedures;
plug_in_class->create_procedure = twain_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
twain_init (Twain *twain)
{
}
static GList *
twain_query_procedures (PikaPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_NAME));
}
static PikaProcedure *
twain_create_procedure (PikaPlugIn *plug_in,
const gchar *name)
{
PikaProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_NAME))
{
procedure = pika_image_procedure_new (plug_in, name,
PIKA_PDB_PROC_TYPE_PLUGIN,
twain_run, NULL, NULL);
pika_procedure_set_image_types (procedure, "*");
pika_procedure_set_sensitivity_mask (procedure,
PIKA_PROCEDURE_SENSITIVE_DRAWABLE |
PIKA_PROCEDURE_SENSITIVE_DRAWABLES |
PIKA_PROCEDURE_SENSITIVE_NO_DRAWABLES |
PIKA_PROCEDURE_SENSITIVE_NO_IMAGE);
pika_procedure_set_menu_label (procedure, _("_Scanner/Camera..."));
pika_procedure_add_menu_path (procedure, "<Image>/File/Create");
pika_procedure_set_documentation (procedure,
PLUG_IN_DESCRIPTION,
PLUG_IN_HELP,
name);
pika_procedure_set_attribution (procedure,
PLUG_IN_AUTHOR,
PLUG_IN_COPYRIGHT,
PLUG_IN_VERSION);
PIKA_PROC_VAL_INT (procedure, "image-count",
"Number of acquired images",
"Number of acquired images",
0, G_MAXINT, 0,
G_PARAM_READWRITE);
PIKA_PROC_VAL_OBJECT_ARRAY (procedure, "images",
"Array of acquired images",
"Array of acquired images",
PIKA_TYPE_IMAGE,
G_PARAM_READWRITE);
}
return procedure;
}
/* Data structure holding data between runs */
/* Currently unused... Eventually may be used
* to track dialog data.
*/
typedef struct
{
gchar sourceName[34];
gfloat xResolution;
gfloat yResolution;
gint xOffset;
gint yOffset;
gint width;
gint height;
gint imageType;
} TwainValues;
/* Default Twain values */
static TwainValues twainvals =
{
"",
100.0, 100.0,
0, 0,
0, 0,
TWPT_RGB
};
/* The standard callback functions */
TXFR_CB_FUNCS standardCbFuncs =
{
preTransferCallback,
beginTransferCallback,
dataTransferCallback,
endTransferCallback,
postTransferCallback
};
/******************************************************************
* Dump handling
******************************************************************/
#ifdef _DEBUG
/* The dumper callback functions */
TXFR_CB_FUNCS dumperCbFuncs =
{
dumpPreTransferCallback,
dumpBeginTransferCallback,
dumpDataTransferCallback,
dumpEndTransferCallback,
dumpPostTransferCallback
};
void
setRunMode (char *argv[])
{
char *exeName = strrchr (argv[0], '\\') + 1;
LogMessage ("Executable name: %s\n", exeName);
if (!_stricmp (exeName, DUMP_NAME))
twain_run_mode = RUN_DUMP;
if (!_stricmp (exeName, READDUMP_NAME))
twain_run_mode = RUN_READDUMP;
}
#endif /* _DEBUG */
int
scanImage (void)
{
#ifdef _DEBUG
if (twain_run_mode == RUN_READDUMP)
{
readDumpedImage (twSession);
return 0;
}
else
#endif /* _DEBUG */
return getImage (twSession);
}
/*
* initTwainAppIdentity
*
* Initialize and return our application's identity for
* the TWAIN runtime.
*/
static pTW_IDENTITY
getAppIdentity (void)
{
pTW_IDENTITY appIdentity = g_new (TW_IDENTITY, 1);
/* Set up the application identity */
appIdentity->Id = 0;
appIdentity->Version.MajorNum = 0;
appIdentity->Version.MinorNum = 1;
appIdentity->Version.Language = TWLG_USA;
appIdentity->Version.Country = TWCY_USA;
strcpy(appIdentity->Version.Info, "PIKA TWAIN 0.6");
appIdentity->ProtocolMajor = TWON_PROTOCOLMAJOR;
appIdentity->ProtocolMinor = TWON_PROTOCOLMINOR;
appIdentity->SupportedGroups = DG_IMAGE;
strcpy(appIdentity->Manufacturer, "Craig Setera");
strcpy(appIdentity->ProductFamily, "PIKA");
strcpy(appIdentity->ProductName, "PIKA");
return appIdentity;
}
/*
* initializeTwain
*
* Do the necessary TWAIN initialization. This sets up
* our TWAIN session information. The session stuff is
* something built by me on top of the standard TWAIN
* datasource manager calls.
*/
pTW_SESSION
initializeTwain (void)
{
pTW_IDENTITY appIdentity;
/* Get our application's identity */
appIdentity = getAppIdentity ();
/* Create a new session object */
twSession = newSession (appIdentity);
/* Register our image transfer callback functions */
#ifdef _DEBUG
if (twain_run_mode == RUN_DUMP)
registerTransferCallbacks (twSession, &dumperCbFuncs, NULL);
else
#endif /* _DEBUG */
registerTransferCallbacks (twSession, &standardCbFuncs, NULL);
return twSession;
}
/******************************************************************
* PIKA Plug-in entry points
******************************************************************/
/* Return values storage */
static GList *image_list = NULL;
static gint image_count = 0;
/*
* run
*
* The plug-in is being requested to run.
* Capture an image from a TWAIN datasource
*/
static PikaValueArray *
twain_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
const PikaValueArray *args,
gpointer run_data)
{
/* Initialize the return values
* Always return at least the status to the caller.
*/
PikaPDBStatusType status = PIKA_PDB_SUCCESS;
PikaValueArray *return_vals = NULL;
PikaImage **images;
GList *list;
gint num_images;
gint i;
gegl_init (NULL, NULL);
/* Before we get any further, verify that we have
* TWAIN and that there is actually a datasource
* to be used in doing the acquire.
*/
if (! twainIsAvailable ())
{
return pika_procedure_new_return_values (procedure, PIKA_PDB_EXECUTION_ERROR,
NULL);
}
/* How are we running today? */
switch (run_mode)
{
case PIKA_RUN_INTERACTIVE:
/* Retrieve values from the last run...
* Currently ignored
*/
pika_get_data (PLUG_IN_NAME, &twainvals);
break;
case PIKA_RUN_NONINTERACTIVE:
/* Currently, we don't do non-interactive calls.
* Bail if someone tries to call us non-interactively
*/
return pika_procedure_new_return_values (procedure, PIKA_PDB_CALLING_ERROR,
NULL);
case PIKA_RUN_WITH_LAST_VALS:
/* Retrieve values from the last run...
* Currently ignored
*/
pika_get_data (PLUG_IN_NAME, &twainvals);
break;
default:
break;
}
/* Have we succeeded so far? */
if (status == PIKA_PDB_SUCCESS)
twainMain ();
/* Check to make sure we got at least one valid
* image.
*/
if (image_count > 0)
{
/* An image was captured from the TWAIN
* datasource. Do final Interactive
* steps.
*/
if (run_mode == PIKA_RUN_INTERACTIVE)
{
/* Store variable states for next run */
pika_set_data (PLUG_IN_NAME, &twainvals, sizeof (TwainValues));
}
num_images = g_list_length (image_list);
images = g_new (PikaImage *, num_images);
for (list = image_list, i = 0;
list;
list = g_list_next (list), i++)
{
images[i] = g_object_ref (list->data);
}
g_list_free (image_list);
/* Set return values */
return_vals = pika_procedure_new_return_values (procedure, status,
NULL);
PIKA_VALUES_SET_INT (return_vals, 1, num_images);
PIKA_VALUES_TAKE_OBJECT_ARRAY (return_vals, 2, PIKA_TYPE_IMAGE, images, num_images);
return return_vals;
}
else
{
return pika_procedure_new_return_values (procedure, PIKA_PDB_EXECUTION_ERROR,
NULL);
}
}
/***********************************************************************
* Image transfer callback functions
***********************************************************************/
/* Data used to carry data between each of
* the callback function calls.
*/
typedef struct
{
PikaImage *image;
PikaLayer *layer;
GeglBuffer *buffer;
const Babl *format;
pTW_PALETTE8 paletteData;
int totalPixels;
int completedPixels;
} ClientDataStruct, *pClientDataStruct;
/*
* preTransferCallback
*
* This callback function is called before any images
* are transferred. Set up the one time only stuff.
*/
void
preTransferCallback (void *clientData)
{
/* Initialize our progress dialog */
pika_progress_init (_("Transferring data from scanner/camera"));
}
/*
* beginTransferCallback
*
* The following function is called at the beginning
* of each image transfer.
*/
int
beginTransferCallback (pTW_IMAGEINFO imageInfo,
void *clientData)
{
pClientDataStruct theClientData = g_new (ClientDataStruct, 1);
const Babl *format;
PikaImageBaseType imageType;
PikaImageType layerType;
PikaPrecision precision;
gint bpc = imageInfo->BitsPerPixel /
imageInfo->SamplesPerPixel;
#ifdef _DEBUG
logBegin (imageInfo, clientData);
#endif
/* Decide on the image type */
switch (imageInfo->PixelType)
{
case TWPT_BW:
/* Set up the image and layer types */
imageType = PIKA_GRAY;
layerType = PIKA_GRAY_IMAGE;
precision = PIKA_PRECISION_U8_NON_LINEAR;
format = babl_format ("Y' u8");
break;
case TWPT_GRAY:
/* Set up the image and layer types */
imageType = PIKA_GRAY;
layerType = PIKA_GRAY_IMAGE;
switch (bpc)
{
case 8:
precision = PIKA_PRECISION_U8_NON_LINEAR;
format = babl_format ("Y' u8");
break;
case 16:
precision = PIKA_PRECISION_U16_NON_LINEAR;
format = babl_format ("Y' u16");
break;
default:
return FALSE;
}
break;
case TWPT_RGB:
/* Set up the image and layer types */
imageType = PIKA_RGB;
layerType = PIKA_RGB_IMAGE;
switch (bpc)
{
case 8:
precision = PIKA_PRECISION_U8_NON_LINEAR;
format = babl_format ("R'G'B' u8");
break;
case 16:
precision = PIKA_PRECISION_U16_NON_LINEAR;
format = babl_format ("R'G'B' u16");
break;
default:
return FALSE;
}
break;
case TWPT_PALETTE:
/* Get the palette data */
theClientData->paletteData = g_new (TW_PALETTE8, 1);
twSession->twRC = callDSM (APP_IDENTITY (twSession),
DS_IDENTITY (twSession),
DG_IMAGE, DAT_PALETTE8, MSG_GET,
(TW_MEMREF) theClientData->paletteData);
if (twSession->twRC != TWRC_SUCCESS)
return FALSE;
switch (theClientData->paletteData->PaletteType)
{
case TWPA_RGB:
/* Set up the image and layer types */
imageType = PIKA_RGB;
layerType = PIKA_RGB_IMAGE;
precision = PIKA_PRECISION_U8_NON_LINEAR;
format = babl_format ("R'G'B' u8");
break;
case TWPA_GRAY:
/* Set up the image and layer types */
imageType = PIKA_GRAY;
layerType = PIKA_GRAY_IMAGE;
precision = PIKA_PRECISION_U8_NON_LINEAR;
format = babl_format ("Y' u8");
break;
default:
return FALSE;
}
break;
default:
/* We don't know how to deal with anything other than
* the types listed above. Bail for any other image
* type.
*/
return FALSE;
}
/* Create the PIKA image */
theClientData->image = pika_image_new_with_precision (imageInfo->ImageWidth,
imageInfo->ImageLength,
imageType,
precision);
/* Set the actual resolution */
pika_image_set_resolution (theClientData->image,
FIX32ToFloat (imageInfo->XResolution),
FIX32ToFloat (imageInfo->YResolution));
pika_image_set_unit (theClientData->image, PIKA_UNIT_INCH);
/* Create a layer */
theClientData->layer = pika_layer_new (theClientData->image,
_("Background"),
imageInfo->ImageWidth,
imageInfo->ImageLength,
layerType, 100,
PIKA_LAYER_MODE_NORMAL);
/* Add the layer to the image */
pika_image_insert_layer (theClientData->image,
theClientData->layer, NULL, 0);
/* Update the progress dialog */
theClientData->totalPixels = imageInfo->ImageWidth * imageInfo->ImageLength;
theClientData->completedPixels = 0;
pika_progress_update (0.0);
theClientData->buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (theClientData->layer));
theClientData->format = format;
/* Store our client data for the data transfer callbacks */
if (clientData)
g_free (clientData);
setClientData (twSession, (void *) theClientData);
/* Make sure to return TRUE to continue the image
* transfer
*/
return TRUE;
}
/*
* bitTransferCallback
*
* The following function is called for each memory
* block that is transferred from the data source if
* the image type is Black/White.
*
* Black and white data is unpacked from bit data
* into byte data and written into a gray scale PIKA
* image.
*/
static char bitMasks[] = { 128, 64, 32, 16, 8, 4, 2, 1 };
static int
bitTransferCallback (pTW_IMAGEINFO imageInfo,
pTW_IMAGEMEMXFER imageMemXfer,
void *clientData)
{
int row, col, offset;
char *srcBuf;
char *destBuf;
int rows = imageMemXfer->Rows;
int cols = imageMemXfer->Columns;
pClientDataStruct theClientData = (pClientDataStruct) clientData;
/* Allocate a buffer as necessary */
destBuf = gegl_scratch_new (char, rows * cols);
/* Unpack the image data from bits into bytes */
srcBuf = (char *) imageMemXfer->Memory.TheMem;
offset = 0;
for (row = 0; row < rows; row++)
{
for (col = 0; col < cols; col++)
{
char byte = srcBuf[(row * imageMemXfer->BytesPerRow) + (col / 8)];
destBuf[offset++] = ((byte & bitMasks[col % 8]) != 0) ? 255 : 0;
}
}
/* Update the complete chunk */
gegl_buffer_set (theClientData->buffer,
GEGL_RECTANGLE (imageMemXfer->XOffset, imageMemXfer->YOffset,
cols, rows), 0,
theClientData->format, destBuf,
GEGL_AUTO_ROWSTRIDE);
/* Free the buffer */
gegl_scratch_free (destBuf);
/* Update the user on our progress */
theClientData->completedPixels += (cols * rows);
pika_progress_update ((double) theClientData->completedPixels /
(double) theClientData->totalPixels);
return TRUE;
}
/*
* directTransferCallback
*
* The following function is called for each memory
* block that is transferred from the data source if
* the image type is Grayscale or RGB.
*/
static int
directTransferCallback (pTW_IMAGEINFO imageInfo,
pTW_IMAGEMEMXFER imageMemXfer,
void *clientData)
{
int rows = imageMemXfer->Rows;
int cols = imageMemXfer->Columns;
pClientDataStruct theClientData = (pClientDataStruct) clientData;
/* Update the complete chunk */
gegl_buffer_set (theClientData->buffer,
GEGL_RECTANGLE (imageMemXfer->XOffset, imageMemXfer->YOffset,
cols, rows), 0,
theClientData->format, imageMemXfer->Memory.TheMem,
imageMemXfer->BytesPerRow);
/* Update the user on our progress */
theClientData->completedPixels += (cols * rows);
pika_progress_update ((double) theClientData->completedPixels /
(double) theClientData->totalPixels);
return TRUE;
}
/*
* palettedTransferCallback
*
* The following function is called for each memory
* block that is transferred from the data source if
* the image type is paletted. This does not create
* an indexed image type in PIKA because for some
* reason it does not allow creation of a specific
* palette. This function will create an RGB or Gray
* image and use the palette to set the details of
* the pixels.
*/
static int
palettedTransferCallback (pTW_IMAGEINFO imageInfo,
pTW_IMAGEMEMXFER imageMemXfer,
void *clientData)
{
int channelsPerEntry;
int row, col;
int rows = imageMemXfer->Rows;
int cols = imageMemXfer->Columns;
char *destBuf;
char *destPtr = NULL;
char *srcPtr = NULL;
/* Get the client data */
pClientDataStruct theClientData = (pClientDataStruct) clientData;
/* Look up the palette entry size */
channelsPerEntry =
(theClientData->paletteData->PaletteType == TWPA_RGB) ? 3 : 1;
/* Allocate a buffer as necessary */
destBuf = gegl_scratch_new (char, rows * cols * channelsPerEntry);
/* Work through the rows */
destPtr = destBuf;
for (row = 0; row < rows; row++)
{
srcPtr = (char *) ((char *) imageMemXfer->Memory.TheMem +
(row * imageMemXfer->BytesPerRow));
/* Work through the columns */
for (col = 0; col < cols; col++)
{
/* Get the palette index */
int index = (unsigned char) *srcPtr;
srcPtr++;
switch (theClientData->paletteData->PaletteType)
{
case TWPA_GRAY:
*destPtr = theClientData->paletteData->Colors[index].Channel1;
destPtr++;
break;
case TWPA_RGB:
*destPtr = theClientData->paletteData->Colors[index].Channel1;
destPtr++;
*destPtr = theClientData->paletteData->Colors[index].Channel2;
destPtr++;
*destPtr = theClientData->paletteData->Colors[index].Channel3;
destPtr++;
}
}
}
/* Send the complete chunk */
gegl_buffer_set (theClientData->buffer,
GEGL_RECTANGLE (imageMemXfer->XOffset, imageMemXfer->YOffset,
cols, rows), 0,
theClientData->format, destBuf,
GEGL_AUTO_ROWSTRIDE);
/* Free the buffer */
gegl_scratch_free (destBuf);
/* Update the user on our progress */
theClientData->completedPixels += (cols * rows);
pika_progress_update ((double) theClientData->completedPixels /
(double) theClientData->totalPixels);
return TRUE;
}
/*
* dataTransferCallback
*
* The following function is called for each memory
* block that is transferred from the data source.
*/
int
dataTransferCallback (pTW_IMAGEINFO imageInfo,
pTW_IMAGEMEMXFER imageMemXfer,
void *clientData)
{
#ifdef _DEBUG
logData (imageInfo, imageMemXfer, clientData);
#endif
/* Choose the appropriate transfer handler */
switch (imageInfo->PixelType)
{
case TWPT_PALETTE:
return palettedTransferCallback (imageInfo, imageMemXfer, clientData);
case TWPT_BW:
return bitTransferCallback (imageInfo, imageMemXfer, clientData);
case TWPT_GRAY:
case TWPT_RGB:
return directTransferCallback (imageInfo, imageMemXfer, clientData);
default:
return FALSE;
}
}
/*
* endTransferCallback
*
* The following function is called at the end of the
* image transfer. The caller will be handed
* the image transfer completion state. The
* following values (defined in twain.h) are
* possible:
*
* TWRC_XFERDONE
* The transfer completed successfully
* TWRC_CANCEL
* The transfer was completed by the user
* TWRC_FAILURE
* The transfer failed.
*/
int
endTransferCallback (int completionState,
int pendingCount,
void *clientData)
{
pClientDataStruct theClientData = (pClientDataStruct) clientData;
LogMessage ("endTransferCallback: CompState = %d, pending = %d\n",
completionState, pendingCount);
/* Clean up and detach from the drawable */
g_object_unref (theClientData->buffer);
/* Make sure to check our return code */
if (completionState == TWRC_XFERDONE)
{
/* We have a completed image transfer */
image_list = g_list_append (image_list, theClientData->image);
image_count++;
/* Display the image */
LogMessage ("Displaying image %d\n",
pika_image_get_id (theClientData->image));
pika_display_new (theClientData->image);
}
else
{
/* The transfer did not complete successfully */
LogMessage ("Deleting image\n");
pika_image_delete (theClientData->image);
}
/* Shut down if we have received all of the possible images */
return (image_count < MAX_IMAGES);
}
/*
* postTransferCallback
*
* This callback function will be called
* after all possible images have been
* transferred.
*/
void
postTransferCallback (int pendingCount,
void *clientData)
{
/* Shut things down. */
if (pendingCount != 0)
cancelPendingTransfers(twSession);
/* This will close the datasource and datasource
* manager. Then the message queue will be shut
* down and the run() procedure will finally be
* able to finish.
*/
disableDS (twSession);
closeDS (twSession);
closeDSM (twSession);
/* Post a message to close up the application */
twainQuitApplication ();
}