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gimp/plug-ins/common/tiff.c
Sven Neumann 1b10f54b5a overworked my latest change and fixed some typos 
--Sven
2000-01-08 12:42:53 +00:00

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/* tiff loading and saving for the GIMP
* -Peter Mattis
* The TIFF loading code has been completely revamped by Nick Lamb
* njl195@zepler.org.uk -- 18 May 1998
* And it now gains support for tiles (and doubtless a zillion bugs)
* njl195@zepler.org.uk -- 12 June 1999
* The code for this filter is based on "tifftopnm" and "pnmtotiff",
* 2 programs that are a part of the netpbm package.
*/
/*
** tifftopnm.c - converts a Tagged Image File to a portable anymap
**
** Derived by Jef Poskanzer from tif2ras.c, which is:
**
** Copyright (c) 1990 by Sun Microsystems, Inc.
**
** Author: Patrick J. Naughton
** naughton@wind.sun.com
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted,
** provided that the above copyright notice appear in all copies and that
** both that copyright notice and this permission notice appear in
** supporting documentation.
**
** This file is provided AS IS with no warranties of any kind. The author
** shall have no liability with respect to the infringement of copyrights,
** trade secrets or any patents by this file or any part thereof. In no
** event will the author be liable for any lost revenue or profits or
** other special, indirect and consequential damages.
*/
#include <stdlib.h>
#include <string.h>
#include <tiffio.h>
#include "libgimp/gimp.h"
#include "libgimp/gimpui.h"
typedef struct
{
gint compression;
gint fillorder;
} TiffSaveVals;
typedef struct
{
gint run;
} TiffSaveInterface;
typedef struct {
gint32 ID;
GDrawable *drawable;
GPixelRgn pixel_rgn;
guchar *pixels;
guchar *pixel;
} channel_data;
/* Declare some local functions.
*/
static void query (void);
static void run (char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals);
static gint32 load_image (char *filename);
static void load_rgba (TIFF *tif, channel_data *channel);
static void load_lines (TIFF *tif, channel_data *channel,
unsigned short bps, unsigned short photomet,
int alpha, int extra);
static void load_tiles (TIFF *tif, channel_data *channel,
unsigned short bps, unsigned short photomet,
int alpha, int extra);
static void read_separate (guchar *source, channel_data *channel,
unsigned short bps, unsigned short photomet,
int startcol, int startrow, int rows, int cols,
int alpha, int extra, int sample);
static void read_16bit (guchar *source, channel_data *channel,
unsigned short photomet,
int startcol, int startrow, int rows, int cols,
int alpha, int extra);
static void read_8bit (guchar *source, channel_data *channel,
unsigned short photomet,
int startcol, int startrow, int rows, int cols,
int alpha, int extra);
static void read_default (guchar *source, channel_data *channel,
unsigned short bps, unsigned short photomet,
int startcol, int startrow, int rows, int cols,
int alpha, int extra);
static gint save_image (char *filename,
gint32 image,
gint32 drawable,
gint32 orig_image);
static void init_gtk ();
static gint save_dialog ();
static void save_close_callback (GtkWidget *widget,
gpointer data);
static void save_ok_callback (GtkWidget *widget,
gpointer data);
static void save_toggle_update (GtkWidget *widget,
gpointer data);
static void comment_entry_callback (GtkWidget *widget,
gpointer data);
#define DEFAULT_COMMENT "Created with The GIMP"
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static TiffSaveVals tsvals =
{
COMPRESSION_LZW, /* compression */
};
static TiffSaveInterface tsint =
{
FALSE /* run */
};
static char *image_comment= NULL;
MAIN ()
static void
query ()
{
static GParamDef load_args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_STRING, "filename", "The name of the file to load" },
{ PARAM_STRING, "raw_filename", "The name of the file to load" },
};
static GParamDef load_return_vals[] =
{
{ PARAM_IMAGE, "image", "Output image" },
};
static int nload_args = sizeof (load_args) / sizeof (load_args[0]);
static int nload_return_vals = sizeof (load_return_vals) / sizeof (load_return_vals[0]);
static GParamDef save_args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image" },
{ PARAM_DRAWABLE, "drawable", "Drawable to save" },
{ PARAM_STRING, "filename", "The name of the file to save the image in" },
{ PARAM_STRING, "raw_filename", "The name of the file to save the image in" },
{ PARAM_INT32, "compression", "Compression type: { NONE (0), LZW (1), PACKBITS (2)" },
};
static int nsave_args = sizeof (save_args) / sizeof (save_args[0]);
gimp_install_procedure ("file_tiff_load",
"loads files of the tiff file format",
"FIXME: write help for tiff_load",
"Spencer Kimball, Peter Mattis & Nick Lamb",
"Nick Lamb <njl195@zepler.org.uk>",
"1995-1996,1998-1999",
"<Load>/Tiff",
NULL,
PROC_PLUG_IN,
nload_args, nload_return_vals,
load_args, load_return_vals);
gimp_install_procedure ("file_tiff_save",
"saves files in the tiff file format",
"FIXME: write help for tiff_save",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1995-1996",
"<Save>/Tiff",
"RGB*, GRAY*, INDEXED",
PROC_PLUG_IN,
nsave_args, 0,
save_args, NULL);
gimp_register_magic_load_handler ("file_tiff_load", "tif,tiff", "",
"0,string,II*\\0,0,string,MM\\0*");
gimp_register_save_handler ("file_tiff_save", "tif,tiff", "");
}
static void
run (char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals)
{
static GParam values[2];
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
#ifdef GIMP_HAVE_PARASITES
Parasite *parasite;
#endif /* GIMP_HAVE_PARASITES */
gint32 image;
gint32 drawable;
gint32 orig_image;
GimpExportReturnType export = EXPORT_CANCEL;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = STATUS_CALLING_ERROR;
if (strcmp (name, "file_tiff_load") == 0)
{
image = load_image (param[1].data.d_string);
if (image != -1)
{
*nreturn_vals = 2;
values[0].data.d_status = STATUS_SUCCESS;
values[1].type = PARAM_IMAGE;
values[1].data.d_image = image;
}
else
{
values[0].data.d_status = STATUS_EXECUTION_ERROR;
}
}
else if (strcmp (name, "file_tiff_save") == 0)
{
image = orig_image = param[1].data.d_int32;
drawable = param[2].data.d_int32;
/* Do this right this time, if POSSIBLE query for parasites, otherwise
or if there isn't one, choose the DEFAULT_COMMENT */
/* eventually export the image */
switch (run_mode)
{
case RUN_INTERACTIVE:
case RUN_WITH_LAST_VALS:
init_gtk ();
export = gimp_export_image (&image, &drawable, "TIFF",
(CAN_HANDLE_RGB | CAN_HANDLE_GRAY | CAN_HANDLE_INDEXED |
CAN_HANDLE_ALPHA));
if (export == EXPORT_CANCEL)
{
*nreturn_vals = 1;
values[0].data.d_status = STATUS_EXECUTION_ERROR;
return;
}
break;
default:
break;
}
#ifdef GIMP_HAVE_PARASITES
parasite = gimp_image_parasite_find (orig_image, "gimp-comment");
if (parasite)
image_comment = g_strdup (parasite->data);
parasite_free(parasite);
#endif /* GIMP_HAVE_PARASITES */
if (!image_comment) image_comment = g_strdup (DEFAULT_COMMENT);
switch (run_mode)
{
case RUN_INTERACTIVE:
{
/* Possibly retrieve data */
gimp_get_data ("file_tiff_save", &tsvals);
#ifdef GIMP_HAVE_PARASITES
parasite = gimp_image_parasite_find (orig_image, "tiff-save-options");
if (parasite)
{
tsvals.compression = ((TiffSaveVals *)parasite->data)->compression;
}
parasite_free(parasite);
#endif /* GIMP_HAVE_PARASITES */
/* First acquire information with a dialog */
if (! save_dialog ())
return;
}
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 6)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS)
{
switch (param[5].data.d_int32)
{
case 0: tsvals.compression = COMPRESSION_NONE; break;
case 1: tsvals.compression = COMPRESSION_LZW; break;
case 2: tsvals.compression = COMPRESSION_PACKBITS; break;
default: status = STATUS_CALLING_ERROR; break;
}
}
case RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
{
gimp_get_data ("file_tiff_save", &tsvals);
#ifdef GIMP_HAVE_PARASITES
parasite = gimp_image_parasite_find (orig_image, "tiff-save-options");
if (parasite)
{
tsvals.compression = ((TiffSaveVals *)parasite->data)->compression;
}
parasite_free (parasite);
#endif /* GIMP_HAVE_PARASITES */
}
break;
default:
break;
}
*nreturn_vals = 1;
if (save_image (param[3].data.d_string, image, drawable, orig_image))
{
/* Store mvals data */
gimp_set_data ("file_tiff_save", &tsvals, sizeof (TiffSaveVals));
values[0].data.d_status = STATUS_SUCCESS;
}
else
values[0].data.d_status = STATUS_EXECUTION_ERROR;
if (export == EXPORT_EXPORT)
gimp_image_delete (image);
}
}
static gint32
load_image (char *filename)
{
TIFF *tif;
unsigned short bps, spp, photomet;
int cols, rows, alpha;
int image, image_type = RGB;
int layer, layer_type = RGB_IMAGE;
unsigned short extra, *extra_types;
channel_data *channel= NULL;
unsigned short *redmap, *greenmap, *bluemap;
guchar colors[3]= {0, 0, 0};
guchar cmap[768];
int i, j, worst_case = 0;
char *name;
TiffSaveVals save_vals;
#ifdef GIMP_HAVE_PARASITES
Parasite *parasite;
#endif /* GIMP_HAVE_PARASITES */
guint16 tmp;
tif = TIFFOpen (filename, "r");
if (!tif) {
g_message ("TIFF Can't open %s\n", filename);
gimp_quit ();
}
name = g_malloc (strlen (filename) + 12);
sprintf (name, "Loading %s:", filename);
gimp_progress_init (name);
g_free (name);
TIFFGetFieldDefaulted (tif, TIFFTAG_BITSPERSAMPLE, &bps);
if (bps > 8 && bps != 16) {
worst_case = 1; /* Wrong sample width => RGBA */
}
TIFFGetFieldDefaulted (tif, TIFFTAG_SAMPLESPERPIXEL, &spp);
if (!TIFFGetField (tif, TIFFTAG_EXTRASAMPLES, &extra, &extra_types))
extra = 0;
if (!TIFFGetField (tif, TIFFTAG_IMAGEWIDTH, &cols)) {
g_message ("TIFF Can't get image width\n");
gimp_quit ();
}
if (!TIFFGetField (tif, TIFFTAG_IMAGELENGTH, &rows)) {
g_message ("TIFF Can't get image length\n");
gimp_quit ();
}
if (!TIFFGetField (tif, TIFFTAG_PHOTOMETRIC, &photomet)) {
g_message("TIFF Can't get photometric\nAssuming min-is-black\n");
/* old AppleScan software misses out the photometric tag (and
* incidentally assumes min-is-white, but xv assumes min-is-black,
* so we follow xv's lead. It's not much hardship to invert the
* image later). */
photomet = PHOTOMETRIC_MINISBLACK;
}
/* test if the extrasample represents an associated alpha channel... */
if (extra > 0 && (extra_types[0] == EXTRASAMPLE_ASSOCALPHA)) {
alpha = 1;
--extra;
} else {
alpha = 0;
}
if (photomet == PHOTOMETRIC_RGB && spp > 3 + extra) {
alpha= 1;
extra= spp - 4;
} else if (photomet != PHOTOMETRIC_RGB && spp > 1 + extra) {
alpha= 1;
extra= spp - 2;
}
switch (photomet) {
case PHOTOMETRIC_MINISBLACK:
case PHOTOMETRIC_MINISWHITE:
image_type = GRAY;
layer_type = (alpha) ? GRAYA_IMAGE : GRAY_IMAGE;
break;
case PHOTOMETRIC_RGB:
image_type = RGB;
layer_type = (alpha) ? RGBA_IMAGE : RGB_IMAGE;
break;
case PHOTOMETRIC_PALETTE:
image_type = INDEXED;
layer_type = (alpha) ? INDEXEDA_IMAGE : INDEXED_IMAGE;
break;
default:
worst_case = 1;
}
if (worst_case) {
image_type = RGB;
layer_type = RGBA_IMAGE;
}
if ((image = gimp_image_new (cols, rows, image_type)) == -1) {
g_message("TIFF Can't create a new image\n");
gimp_quit ();
}
gimp_image_set_filename (image, filename);
/* attach a parasite containing the compression/fillorder */
if (!TIFFGetField (tif, TIFFTAG_COMPRESSION, &tmp))
save_vals.compression = COMPRESSION_NONE;
else
save_vals.compression = tmp;
#ifdef GIMP_HAVE_PARASITES
parasite = parasite_new("tiff-save-options", 0,
sizeof(save_vals), &save_vals);
gimp_image_parasite_attach(image, parasite);
parasite_free(parasite);
#endif /* GIMP_HAVE_PARASITES */
/* Attach a parasite containing the image description. Pretend to
* be a gimp comment so other plugins will use this description as
* an image comment where appropriate. */
#ifdef GIMP_HAVE_PARASITES
{
char *img_desc;
if (TIFFGetField (tif, TIFFTAG_IMAGEDESCRIPTION, &img_desc))
{
int len;
len = strlen(img_desc) + 1;
len = MIN(len, 241);
img_desc[len-1] = '\000';
parasite = parasite_new ("gimp-comment", PARASITE_PERSISTENT,
len, img_desc);
gimp_image_parasite_attach (image, parasite);
parasite_free (parasite);
}
}
#endif /* GIMP_HAVE_PARASITES */
/* any resolution info in the file? */
#ifdef GIMP_HAVE_RESOLUTION_INFO
{
float xres = 72.0, yres = 72.0;
unsigned short read_unit;
GUnit unit = UNIT_PIXEL; /* invalid unit */
if (TIFFGetField (tif, TIFFTAG_XRESOLUTION, &xres)) {
if (TIFFGetField (tif, TIFFTAG_YRESOLUTION, &yres)) {
if (TIFFGetFieldDefaulted (tif, TIFFTAG_RESOLUTIONUNIT, &read_unit))
{
switch (read_unit)
{
case RESUNIT_NONE:
/* ImageMagick writes files with this silly resunit */
g_message ("TIFF warning: resolution units meaningless\n");
break;
case RESUNIT_INCH:
unit = UNIT_INCH;
break;
case RESUNIT_CENTIMETER:
xres *= 2.54;
yres *= 2.54;
unit = UNIT_MM; /* as this is our default metric unit */
break;
default:
g_message ("TIFF file error: unknown resolution unit type %d, "
"assuming dpi\n", read_unit);
}
}
else
{ /* no res unit tag */
/* old AppleScan software produces these */
g_message ("TIFF warning: resolution specified without\n"
"any units tag, assuming dpi\n");
}
}
else
{ /* xres but no yres */
g_message("TIFF warning: no y resolution info, assuming same as x\n");
yres = xres;
}
/* now set the new image's resolution info */
/* If it is invalid, instead of forcing 72dpi, do not set the resolution
at all. Gimp will then use the default set by the user */
if (read_unit != RESUNIT_NONE)
{
gimp_image_set_resolution (image, xres, yres);
if (unit != UNIT_PIXEL)
gimp_image_set_unit (image, unit);
}
}
/* no x res tag => we assume we have no resolution info, so we
* don't care. Older versions of this plugin used to write files
* with no resolution tags at all. */
/* TODO: haven't caught the case where yres tag is present, but
not xres. This is left as an exercise for the reader - they
should feel free to shoot the author of the broken program
that produced the damaged TIFF file in the first place. */
}
#endif /* GIMP_HAVE_RESOLUTION_INFO */
/* Install colormap for INDEXED images only */
if (image_type == INDEXED)
{
if (!TIFFGetField (tif, TIFFTAG_COLORMAP, &redmap, &greenmap, &bluemap))
{
g_message ("TIFF Can't get colormaps\n");
gimp_quit ();
}
for (i = 0, j = 0; i < (1 << bps); i++)
{
cmap[j++] = redmap[i] >> 8;
cmap[j++] = greenmap[i] >> 8;
cmap[j++] = bluemap[i] >> 8;
}
gimp_image_set_cmap (image, cmap, (1 << bps));
}
/* Allocate channel_data for all channels, even the background layer */
channel = g_new (channel_data, extra + 1);
layer = gimp_layer_new (image, "Background", cols, rows, layer_type,
100, NORMAL_MODE);
channel[0].ID= layer;
gimp_image_add_layer (image, layer, 0);
channel[0].drawable= gimp_drawable_get(layer);
if (extra > 0 && !worst_case) {
/* Add alpha channels as appropriate */
for (i= 1; i <= extra; ++i) {
channel[i].ID= gimp_channel_new(image, "TIFF Channel", cols, rows,
100.0, colors);
gimp_image_add_channel(image, channel[i].ID, 0);
channel[i].drawable= gimp_drawable_get (channel[i].ID);
}
}
if (worst_case) {
g_message("TIFF Fell back to RGBA, image may be inverted\n");
load_rgba (tif, channel);
} else if (TIFFIsTiled(tif)) {
load_tiles (tif, channel, bps, photomet, alpha, extra);
} else { /* Load scanlines in tile_height chunks */
load_lines (tif, channel, bps, photomet, alpha, extra);
}
for (i= 0; i < extra; ++i) {
gimp_drawable_flush (channel[i].drawable);
gimp_drawable_detach (channel[i].drawable);
}
return image;
}
static void
load_rgba (TIFF *tif, channel_data *channel)
{
uint32 imageWidth, imageLength;
gulong *buffer;
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imageWidth);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &imageLength);
gimp_pixel_rgn_init (&(channel[0].pixel_rgn), channel[0].drawable,
0, 0, imageWidth, imageLength, TRUE, FALSE);
buffer = g_new(gulong, imageWidth * imageLength);
channel[0].pixels = (guchar*) buffer;
if (buffer == NULL) {
g_message("TIFF Unable to allocate temporary buffer\n");
}
if (!TIFFReadRGBAImage(tif, imageWidth, imageLength, buffer, 0))
g_message("TIFF Unsupported layout, no RGBA loader\n");
gimp_pixel_rgn_set_rect(&(channel[0].pixel_rgn), channel[0].pixels,
0, 0, imageWidth, imageLength);
g_message("TIFF Fell back to RGBA, image may be inverted\n");
}
static void
load_tiles (TIFF *tif, channel_data *channel,
unsigned short bps, unsigned short photomet,
int alpha, int extra)
{
uint16 planar= PLANARCONFIG_CONTIG;
uint32 imageWidth, imageLength;
uint32 tileWidth, tileLength;
uint32 x, y, rows, cols;
guchar *buffer;
double progress= 0.0, one_row;
int i;
TIFFGetField(tif, TIFFTAG_PLANARCONFIG, &planar);
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imageWidth);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &imageLength);
TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tileWidth);
TIFFGetField(tif, TIFFTAG_TILELENGTH, &tileLength);
one_row = (double) tileLength / (double) imageLength;
buffer = g_malloc(TIFFTileSize(tif));
for (i= 0; i <= extra; ++i) {
channel[i].pixels= g_new(guchar, tileWidth * tileLength *
channel[i].drawable->bpp);
}
for (y = 0; y < imageLength; y += tileLength) {
for (x = 0; x < imageWidth; x += tileWidth) {
gimp_progress_update (progress + one_row *
( (double) x / (double) imageWidth));
TIFFReadTile(tif, buffer, x, y, 0, 0);
cols= MIN(imageWidth - x, tileWidth);
rows= MIN(imageLength - y, tileLength);
if (bps == 16) {
read_16bit(buffer, channel, photomet, y, x, rows, cols, alpha, extra);
} else if (bps == 8) {
read_8bit(buffer, channel, photomet, y, x, rows, cols, alpha, extra);
} else {
read_default(buffer, channel, bps, photomet,
y, x, rows, cols, alpha, extra);
}
}
progress+= one_row;
}
for (i= 0; i <= extra; ++i) {
g_free(channel[i].pixels);
}
g_free(buffer);
}
static void
load_lines (TIFF *tif, channel_data *channel,
unsigned short bps, unsigned short photomet,
int alpha, int extra)
{
uint16 planar= PLANARCONFIG_CONTIG;
uint32 imageLength, lineSize, cols, rows;
guchar *buffer;
int i, y, tile_height = gimp_tile_height ();
TIFFGetField(tif, TIFFTAG_PLANARCONFIG, &planar);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &imageLength);
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &cols);
lineSize= TIFFScanlineSize(tif);
for (i= 0; i <= extra; ++i) {
channel[i].pixels= g_new(guchar, tile_height * cols
* channel[i].drawable->bpp);
}
buffer = g_malloc(lineSize * tile_height);
if (planar == PLANARCONFIG_CONTIG) {
for (y = 0; y < imageLength; y+= tile_height ) {
gimp_progress_update ( (double) y / (double) imageLength);
rows = MIN(tile_height, imageLength - y);
for (i = 0; i < rows; ++i)
TIFFReadScanline(tif, buffer + i * lineSize, y + i, 0);
if (bps == 16) {
read_16bit(buffer, channel, photomet, y, 0, rows, cols, alpha, extra);
} else if (bps == 8) {
read_8bit(buffer, channel, photomet, y, 0, rows, cols, alpha, extra);
} else {
read_default(buffer, channel, bps, photomet,
y, 0, rows, cols, alpha, extra);
}
}
} else { /* PLANARCONFIG_SEPARATE -- Just say "No" */
uint16 s, samples;
TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &samples);
for (s = 0; s < samples; ++s) {
for (y = 0; y < imageLength; y+= tile_height ) {
gimp_progress_update ( (double) y / (double) imageLength);
rows = MIN(tile_height, imageLength - y);
for (i = 0; i < rows; ++i)
TIFFReadScanline(tif, buffer + i * lineSize, y + i, s);
read_separate (buffer, channel, bps, photomet,
y, 0, rows, cols, alpha, extra, s);
}
}
}
for (i= 0; i <= extra; ++i) {
g_free(channel[i].pixels);
}
g_free(buffer);
}
static void
read_16bit (guchar *source, channel_data *channel, unsigned short photomet,
int startrow, int startcol, int rows, int cols,
int alpha, int extra)
{
guchar *dest;
int gray_val, red_val, green_val, blue_val, alpha_val;
int col, row, i;
for (i= 0; i <= extra; ++i) {
gimp_pixel_rgn_init (&(channel[i].pixel_rgn), channel[i].drawable,
startcol, startrow, cols, rows, TRUE, FALSE);
}
for (row = 0; row < rows; ++row) {
dest= channel[0].pixels + row * cols * channel[0].drawable->bpp;
for (i= 1; i <= extra; ++i) {
channel[i].pixel= channel[i].pixels + row * cols;
}
for (col = 0; col < cols; col++) {
switch (photomet) {
case PHOTOMETRIC_MINISBLACK:
if (alpha) {
gray_val= *source; source+= 2;
alpha_val= *source; source+= 2;
if (alpha_val)
*dest++ = gray_val * 255 / alpha_val;
else
*dest++ = 0;
*dest++ = alpha_val;
} else {
*dest++ = *source; source+= 2;
}
break;
case PHOTOMETRIC_MINISWHITE:
if (alpha) {
gray_val= *source; source+= 2;
alpha_val= *source; source+= 2;
if (alpha_val)
*dest++ = ((255 - gray_val) * 255) / alpha_val;
else
*dest++ = 0;
*dest++ = alpha_val;
} else {
*dest++ = ~(*source); source+= 2;
}
break;
case PHOTOMETRIC_PALETTE:
*dest++= *source; source+= 2;
if (alpha) *dest++= *source; source+= 2;
break;
case PHOTOMETRIC_RGB:
if (alpha) {
red_val= *source; source+= 2;
green_val= *source; source+= 2;
blue_val= *source; source+= 2;
alpha_val= *source; source+= 2;
if (alpha_val) {
*dest++ = (red_val * 255) / alpha_val;
*dest++ = (green_val * 255) / alpha_val;
*dest++ = (blue_val * 255) / alpha_val;
} else {
*dest++ = 0;
*dest++ = 0;
*dest++ = 0;
}
*dest++ = alpha_val;
} else {
*dest++ = *source; source+= 2;
*dest++ = *source; source+= 2;
*dest++ = *source; source+= 2;
}
break;
default:
/* This case was handled earlier */
g_assert_not_reached();
}
for (i= 1; i <= extra; ++i) {
*channel[i].pixel++ = *source; source+= 2;
}
}
}
for (i= 0; i <= extra; ++i) {
gimp_pixel_rgn_set_rect(&(channel[i].pixel_rgn), channel[i].pixels,
startcol, startrow, cols, rows);
}
}
static void
read_8bit (guchar *source, channel_data *channel, unsigned short photomet,
int startrow, int startcol, int rows, int cols,
int alpha, int extra)
{
guchar *dest;
int gray_val, red_val, green_val, blue_val, alpha_val;
int col, row, i;
for (i= 0; i <= extra; ++i) {
gimp_pixel_rgn_init (&(channel[i].pixel_rgn), channel[i].drawable,
startcol, startrow, cols, rows, TRUE, FALSE);
}
for (row = 0; row < rows; ++row) {
dest= channel[0].pixels + row * cols * channel[0].drawable->bpp;
for (i= 1; i <= extra; ++i) {
channel[i].pixel= channel[i].pixels + row * cols;
}
for (col = 0; col < cols; col++) {
switch (photomet) {
case PHOTOMETRIC_MINISBLACK:
if (alpha) {
gray_val= *source++;
alpha_val= *source++;
if (alpha_val)
*dest++ = gray_val * 255 / alpha_val;
else
*dest++ = 0;
*dest++ = alpha_val;
} else {
*dest++ = *source++;
}
break;
case PHOTOMETRIC_MINISWHITE:
if (alpha) {
gray_val= *source++;
alpha_val= *source++;
if (alpha_val)
*dest++ = ((255 - gray_val) * 255) / alpha_val;
else
*dest++ = 0;
*dest++ = alpha_val;
} else {
*dest++ = ~(*source++);
}
break;
case PHOTOMETRIC_PALETTE:
*dest++= *source++;
if (alpha) *dest++= *source++;
break;
case PHOTOMETRIC_RGB:
if (alpha) {
red_val= *source++;
green_val= *source++;
blue_val= *source++;
alpha_val= *source++;
if (alpha_val) {
*dest++ = (red_val * 255) / alpha_val;
*dest++ = (green_val * 255) / alpha_val;
*dest++ = (blue_val * 255) / alpha_val;
} else {
*dest++ = 0;
*dest++ = 0;
*dest++ = 0;
}
*dest++ = alpha_val;
} else {
*dest++ = *source++;
*dest++ = *source++;
*dest++ = *source++;
}
break;
default:
/* This case was handled earlier */
g_assert_not_reached();
}
for (i= 1; i <= extra; ++i) {
*channel[i].pixel++ = *source++;
}
}
}
for (i= 0; i <= extra; ++i) {
gimp_pixel_rgn_set_rect(&(channel[i].pixel_rgn), channel[i].pixels,
startcol, startrow, cols, rows);
}
}
/* Step through all <= 8-bit samples in an image */
#define NEXTSAMPLE(var) \
{ \
if (bitsleft == 0) \
{ \
source++; \
bitsleft = 8; \
} \
bitsleft -= bps; \
var = ( *source >> bitsleft ) & maxval; \
}
static void
read_default (guchar *source, channel_data *channel,
unsigned short bps, unsigned short photomet,
int startrow, int startcol, int rows, int cols,
int alpha, int extra)
{
guchar *dest;
int gray_val, red_val, green_val, blue_val, alpha_val;
int col, row, i;
int bitsleft = 8, maxval = (1 << bps) - 1;
for (i= 0; i <= extra; ++i) {
gimp_pixel_rgn_init (&(channel[i].pixel_rgn), channel[i].drawable,
startcol, startrow, cols, rows, TRUE, FALSE);
}
for (row = 0; row < rows; ++row) {
dest= channel[0].pixels + row * cols * channel[0].drawable->bpp;
for (i= 1; i <= extra; ++i) {
channel[i].pixel= channel[i].pixels + row * cols;
}
for (col = 0; col < cols; col++) {
switch (photomet) {
case PHOTOMETRIC_MINISBLACK:
NEXTSAMPLE(gray_val);
if (alpha) {
NEXTSAMPLE(alpha_val);
if (alpha_val)
*dest++ = (gray_val * 65025) / (alpha_val * maxval);
else
*dest++ = 0;
*dest++ = alpha_val;
} else {
*dest++ = (gray_val * 255) / maxval;
}
break;
case PHOTOMETRIC_MINISWHITE:
NEXTSAMPLE(gray_val);
if (alpha) {
NEXTSAMPLE(alpha_val);
if (alpha_val)
*dest++ = ((maxval - gray_val) * 65025) / (alpha_val * maxval);
else
*dest++ = 0;
*dest++ = alpha_val;
} else {
*dest++ = ((maxval - gray_val) * 255) / maxval;
}
break;
case PHOTOMETRIC_PALETTE:
NEXTSAMPLE(*dest++);
if (alpha) {
NEXTSAMPLE(*dest++);
}
break;
case PHOTOMETRIC_RGB:
NEXTSAMPLE(red_val)
NEXTSAMPLE(green_val)
NEXTSAMPLE(blue_val)
if (alpha) {
NEXTSAMPLE(alpha_val)
if (alpha_val) {
*dest++ = (red_val * 255) / alpha_val;
*dest++ = (green_val * 255) / alpha_val;
*dest++ = (blue_val * 255) / alpha_val;
} else {
*dest++ = 0;
*dest++ = 0;
*dest++ = 0;
}
*dest++ = alpha_val;
} else {
*dest++ = red_val;
*dest++ = green_val;
*dest++ = blue_val;
}
break;
default:
/* This case was handled earlier */
g_assert_not_reached();
}
for (i= 1; i <= extra; ++i) {
NEXTSAMPLE(alpha_val);
*channel[i].pixel++ = alpha_val;
}
}
bitsleft= 0;
}
for (i= 0; i <= extra; ++i) {
gimp_pixel_rgn_set_rect(&(channel[i].pixel_rgn), channel[i].pixels,
startcol, startrow, cols, rows);
}
}
static void
read_separate (guchar *source, channel_data *channel,
unsigned short bps, unsigned short photomet,
int startrow, int startcol, int rows, int cols,
int alpha, int extra, int sample)
{
guchar *dest;
int col, row, c;
int bitsleft = 8, maxval = (1 << bps) - 1;
if (bps > 8) {
g_message("TIFF Unsupported layout\n");
gimp_quit();
}
if (sample < channel[0].drawable->bpp) {
c = 0;
} else {
c = (sample - channel[0].drawable->bpp) + 4;
photomet = PHOTOMETRIC_MINISBLACK;
}
gimp_pixel_rgn_init (&(channel[c].pixel_rgn), channel[c].drawable,
startcol, startrow, cols, rows, TRUE, FALSE);
gimp_pixel_rgn_get_rect(&(channel[c].pixel_rgn), channel[c].pixels,
startcol, startrow, cols, rows);
for (row = 0; row < rows; ++row) {
dest = channel[c].pixels + row * cols * channel[c].drawable->bpp;
if (c == 0) {
for (col = 0; col < cols; ++col) {
NEXTSAMPLE(dest[col * channel[0].drawable->bpp + sample]);
}
} else {
for (col = 0; col < cols; ++col)
NEXTSAMPLE(dest[col]);
}
}
gimp_pixel_rgn_set_rect(&(channel[c].pixel_rgn), channel[c].pixels,
startcol, startrow, cols, rows);
}
/*
** pnmtotiff.c - converts a portable anymap to a Tagged Image File
**
** Derived by Jef Poskanzer from ras2tif.c, which is:
**
** Copyright (c) 1990 by Sun Microsystems, Inc.
**
** Author: Patrick J. Naughton
** naughton@wind.sun.com
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted,
** provided that the above copyright notice appear in all copies and that
** both that copyright notice and this permission notice appear in
** supporting documentation.
**
** This file is provided AS IS with no warranties of any kind. The author
** shall have no liability with respect to the infringement of copyrights,
** trade secrets or any patents by this file or any part thereof. In no
** event will the author be liable for any lost revenue or profits or
** other special, indirect and consequential damages.
*/
static gint save_image (char *filename,
gint32 image,
gint32 layer,
gint32 orig_image) /* the export function might have created a duplicate */
{
TIFF *tif;
unsigned short red[256];
unsigned short grn[256];
unsigned short blu[256];
int cols, col, rows, row, i;
long g3options;
long rowsperstrip;
unsigned short compression;
unsigned short extra_samples[1];
int alpha;
short predictor;
short photometric;
short samplesperpixel;
short bitspersample;
int bytesperrow;
guchar *t, *src, *data;
guchar *cmap;
int colors;
int success;
GDrawable *drawable;
GDrawableType drawable_type;
GPixelRgn pixel_rgn;
int tile_height;
int y, yend;
char *name;
compression = tsvals.compression;
g3options = 0;
predictor = 0;
rowsperstrip = 0;
tif = TIFFOpen (filename, "w");
if (!tif)
{
g_print ("Can't write image to\n%s", filename);
return 0;
}
name = malloc (strlen (filename) + 11);
sprintf (name, "Saving %s:", filename);
gimp_progress_init (name);
free (name);
drawable = gimp_drawable_get (layer);
drawable_type = gimp_drawable_type (layer);
gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0, drawable->width, drawable->height, FALSE, FALSE);
cols = drawable->width;
rows = drawable->height;
switch (drawable_type)
{
case RGB_IMAGE:
predictor = 2;
samplesperpixel = 3;
bitspersample = 8;
photometric = PHOTOMETRIC_RGB;
bytesperrow = cols * 3;
alpha = 0;
break;
case GRAY_IMAGE:
samplesperpixel = 1;
bitspersample = 8;
photometric = PHOTOMETRIC_MINISBLACK;
bytesperrow = cols;
alpha = 0;
break;
case RGBA_IMAGE:
predictor = 2;
samplesperpixel = 4;
bitspersample = 8;
photometric = PHOTOMETRIC_RGB;
bytesperrow = cols * 4;
alpha = 1;
break;
case GRAYA_IMAGE:
samplesperpixel = 2;
bitspersample = 8;
photometric = PHOTOMETRIC_MINISBLACK;
bytesperrow = cols * 2;
alpha = 1;
break;
case INDEXED_IMAGE:
samplesperpixel = 1;
bitspersample = 8;
photometric = PHOTOMETRIC_PALETTE;
bytesperrow = cols;
alpha = 0;
cmap = gimp_image_get_cmap (image, &colors);
for (i = 0; i < colors; i++)
{
red[i] = *cmap++ * 65535 / 255;
grn[i] = *cmap++ * 65535 / 255;
blu[i] = *cmap++ * 65535 / 255;
}
break;
case INDEXEDA_IMAGE:
return 0;
default:
return 0;
}
if (rowsperstrip == 0)
rowsperstrip = (8 * 1024) / bytesperrow;
if (rowsperstrip == 0)
rowsperstrip = 1;
/* Set TIFF parameters. */
TIFFSetField (tif, TIFFTAG_IMAGEWIDTH, cols);
TIFFSetField (tif, TIFFTAG_IMAGELENGTH, rows);
TIFFSetField (tif, TIFFTAG_BITSPERSAMPLE, bitspersample);
TIFFSetField (tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
TIFFSetField (tif, TIFFTAG_COMPRESSION, compression);
if ((compression == COMPRESSION_LZW) && (predictor != 0))
TIFFSetField (tif, TIFFTAG_PREDICTOR, predictor);
if (alpha)
{
extra_samples [0] = EXTRASAMPLE_ASSOCALPHA;
TIFFSetField (tif, TIFFTAG_EXTRASAMPLES, 1, extra_samples);
}
TIFFSetField (tif, TIFFTAG_PHOTOMETRIC, photometric);
TIFFSetField (tif, TIFFTAG_DOCUMENTNAME, filename);
TIFFSetField (tif, TIFFTAG_SAMPLESPERPIXEL, samplesperpixel);
TIFFSetField (tif, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
/* TIFFSetField( tif, TIFFTAG_STRIPBYTECOUNTS, rows / rowsperstrip ); */
TIFFSetField (tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
#ifdef GIMP_HAVE_RESOLUTION_INFO
/* resolution fields */
{
double xresolution;
double yresolution;
unsigned short save_unit = RESUNIT_INCH;
GUnit unit;
float factor;
gimp_image_get_resolution (orig_image, &xresolution, &yresolution);
unit = gimp_image_get_unit (orig_image);
factor = gimp_unit_get_factor (unit);
/* if we have a metric unit, save the resolution as centimeters
*/
if ((ABS(factor - 0.0254) < 1e-5) || /* m */
(ABS(factor - 0.254) < 1e-5) || /* why not ;) */
(ABS(factor - 2.54) < 1e-5) || /* cm */
(ABS(factor - 25.4) < 1e-5)) /* mm */
{
save_unit = RESUNIT_CENTIMETER;
xresolution /= 2.54;
yresolution /= 2.54;
}
if (xresolution > 1e-5 && yresolution > 1e-5)
{
TIFFSetField (tif, TIFFTAG_XRESOLUTION, xresolution);
TIFFSetField (tif, TIFFTAG_YRESOLUTION, yresolution);
TIFFSetField (tif, TIFFTAG_RESOLUTIONUNIT, save_unit);
}
}
#endif /* GIMP_HAVE_RESOLUTION_INFO */
/* do we have a comment? If so, create a new parasite to hold it,
* and attach it to the image. The attach function automatically
* detaches a previous incarnation of the parasite. */
#ifdef GIMP_HAVE_PARASITES
if (image_comment && *image_comment != '\000')
{
Parasite *parasite;
TIFFSetField (tif, TIFFTAG_IMAGEDESCRIPTION, image_comment);
parasite = parasite_new ("gimp-comment", 1,
strlen (image_comment) + 1, image_comment);
gimp_image_parasite_attach (orig_image, parasite);
parasite_free (parasite);
}
#endif /* GIMP_HAVE_PARASITES */
if (drawable_type == INDEXED_IMAGE)
TIFFSetField (tif, TIFFTAG_COLORMAP, red, grn, blu);
/* array to rearrange data */
tile_height = gimp_tile_height ();
src = g_new (guchar, bytesperrow * tile_height);
data = g_new (guchar, bytesperrow);
/* Now write the TIFF data. */
for (y = 0; y < rows; y = yend)
{
yend = y + tile_height;
yend = MIN (yend, rows);
gimp_pixel_rgn_get_rect (&pixel_rgn, src, 0, y, cols, yend - y);
for (row = y; row < yend; row++)
{
t = src + bytesperrow * (row - y);
switch (drawable_type)
{
case INDEXED_IMAGE:
success = (TIFFWriteScanline (tif, t, row, 0) >= 0);
break;
case GRAY_IMAGE:
success = (TIFFWriteScanline (tif, t, row, 0) >= 0);
break;
case GRAYA_IMAGE:
for (col = 0; col < cols*samplesperpixel; col+=samplesperpixel)
{
/* pre-multiply gray by alpha */
data[col + 0] = (t[col + 0] * t[col + 1]) / 255;
data[col + 1] = t[col + 1]; /* alpha channel */
}
success = (TIFFWriteScanline (tif, data, row, 0) >= 0);
break;
case RGB_IMAGE:
success = (TIFFWriteScanline (tif, t, row, 0) >= 0);
break;
case RGBA_IMAGE:
for (col = 0; col < cols*samplesperpixel; col+=samplesperpixel)
{
/* pre-multiply rgb by alpha */
data[col+0] = t[col + 0] * t[col + 3] / 255;
data[col+1] = t[col + 1] * t[col + 3] / 255;
data[col+2] = t[col + 2] * t[col + 3] / 255;
data[col+3] = t[col + 3]; /* alpha channel */
}
success = (TIFFWriteScanline (tif, data, row, 0) >= 0);
break;
default:
success = FALSE;
break;
}
if (!success) {
g_message("TIFF Failed a scanline write on row %d", row);
return 0;
}
}
gimp_progress_update ((double) row / (double) rows);
}
TIFFFlushData (tif);
TIFFClose (tif);
gimp_drawable_detach (drawable);
g_free (data);
return 1;
}
static void
init_gtk ()
{
gchar **argv;
gint argc;
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("tiff");
gtk_init (&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
}
static gint
save_dialog ()
{
GtkWidget *dlg;
GtkWidget *hbbox;
GtkWidget *button;
GtkWidget *toggle;
GtkWidget *frame;
GtkWidget *toggle_vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *entry;
GSList *group;
gint use_none = (tsvals.compression == COMPRESSION_NONE);
gint use_lzw = (tsvals.compression == COMPRESSION_LZW);
gint use_packbits = (tsvals.compression == COMPRESSION_PACKBITS);
dlg = gtk_dialog_new ();
gtk_window_set_title (GTK_WINDOW (dlg), "Save as Tiff");
gtk_window_position (GTK_WINDOW (dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
(GtkSignalFunc) save_close_callback,
NULL);
/* Action area */
gtk_container_set_border_width (GTK_CONTAINER (GTK_DIALOG (dlg)->action_area), 2);
gtk_box_set_homogeneous (GTK_BOX (GTK_DIALOG (dlg)->action_area), FALSE);
hbbox = gtk_hbutton_box_new ();
gtk_button_box_set_spacing (GTK_BUTTON_BOX (hbbox), 4);
gtk_box_pack_end (GTK_BOX (GTK_DIALOG (dlg)->action_area), hbbox, FALSE, FALSE, 0);
gtk_widget_show (hbbox);
button = gtk_button_new_with_label ("OK");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) save_ok_callback,
dlg);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gtk_widget_grab_default (button);
gtk_widget_show (button);
button = gtk_button_new_with_label ("Cancel");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) gtk_widget_destroy,
GTK_OBJECT (dlg));
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
/* hbox for compression and fillorder settings */
hbox = gtk_hbox_new (FALSE, 5);
/* compression */
frame = gtk_frame_new ("Compression");
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_container_border_width (GTK_CONTAINER (frame), 10);
gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, FALSE, 0);
toggle_vbox = gtk_vbox_new (FALSE, 5);
gtk_container_border_width (GTK_CONTAINER (toggle_vbox), 5);
gtk_container_add (GTK_CONTAINER (frame), toggle_vbox);
group = NULL;
toggle = gtk_radio_button_new_with_label (group, "None");
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) save_toggle_update,
&use_none);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_none);
gtk_widget_show (toggle);
toggle = gtk_radio_button_new_with_label (group, "LZW");
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) save_toggle_update,
&use_lzw);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_lzw);
gtk_widget_show (toggle);
toggle = gtk_radio_button_new_with_label (group, "Pack Bits");
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) save_toggle_update,
&use_packbits);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_packbits);
gtk_widget_show (toggle);
gtk_widget_show (toggle_vbox);
gtk_widget_show (frame);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), hbox, FALSE, TRUE, 0);
gtk_widget_show (hbox);
/* comment entry */
frame = gtk_frame_new(NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_NONE);
gtk_container_border_width (GTK_CONTAINER (frame), 10);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, FALSE, TRUE, 0);
hbox = gtk_hbox_new (FALSE, 5);
label = gtk_label_new ("Comment: ");
gtk_widget_show (label);
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
entry = gtk_entry_new ();
gtk_widget_show (entry);
gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE, 0);
gtk_entry_set_text (GTK_ENTRY (entry), image_comment);
gtk_signal_connect (GTK_OBJECT (entry), "changed",
(GtkSignalFunc) comment_entry_callback,
NULL);
gtk_container_add (GTK_CONTAINER (frame), hbox);
gtk_widget_show (hbox);
gtk_widget_show (frame);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
if (use_none)
tsvals.compression = COMPRESSION_NONE;
else if (use_lzw)
tsvals.compression = COMPRESSION_LZW;
else if (use_packbits)
tsvals.compression = COMPRESSION_PACKBITS;
return tsint.run;
}
/* Save interface functions */
static void
save_close_callback (GtkWidget *widget,
gpointer data)
{
gtk_main_quit ();
}
static void
save_ok_callback (GtkWidget *widget,
gpointer data)
{
tsint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static void
save_toggle_update (GtkWidget *widget,
gpointer data)
{
int *toggle_val;
toggle_val = (int *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
*toggle_val = TRUE;
else
*toggle_val = FALSE;
}
static void
comment_entry_callback (GtkWidget *widget,
gpointer data)
{
int len;
char *text;
text = gtk_entry_get_text (GTK_ENTRY (widget));
len = strlen(text);
/* Temporary kludge for overlength strings - just return */
if (len > 240)
{
g_message ("TIFF save: Your comment string is too long.\n");
return;
}
g_free (image_comment);
image_comment = g_strdup (text);
/* g_print ("COMMENT: %s\n", image_comment); */
}
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