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gimp/plug-ins/common/tga.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* $Id$
* TrueVision Targa loading and saving file filter for the Gimp.
* Targa code Copyright (C) 1997 Raphael FRANCOIS and Gordon Matzigkeit
*
* The Targa reading and writing code was written from scratch by
* Raphael FRANCOIS <fraph@ibm.net> and Gordon Matzigkeit
* <gord@gnu.ai.mit.edu> based on the TrueVision TGA File Format
* Specification, Version 2.0:
*
* <URL:ftp://ftp.truevision.com/pub/TGA.File.Format.Spec/>
*
* It does not contain any code written for other TGA file loaders.
* Not even the RLE handling. ;)
*
* 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.
*/
/*
* Modified August-November 2000, Nick Lamb <njl195@zepler.org.uk>
* - Clean-up more code, avoid structure implementation dependency,
* - Load more types of images reliably, reject others firmly
* - This is not perfect, but I think it's much better. Test please!
*
* Release 1.2, 1997-09-24, Gordon Matzigkeit <gord@gnu.ai.mit.edu>:
* - Bug fixes and source cleanups.
*
* Release 1.1, 1997-09-19, Gordon Matzigkeit <gord@gnu.ai.mit.edu>:
* - Preserve alpha channels. For indexed images, this can only be
* done if there is at least one free colormap entry.
*
* Release 1.0, 1997-09-06, Gordon Matzigkeit <gord@gnu.ai.mit.edu>:
* - Handle loading all image types from the 2.0 specification.
* - Fix many alignment and endianness problems.
* - Use tiles for lower memory consumption and better speed.
* - Rewrite RLE code for clarity and speed.
* - Handle saving with RLE.
*
* Release 0.9, 1997-06-18, Raphael FRANCOIS <fraph@ibm.net>:
* - Can load 24 and 32-bit Truecolor images, with and without RLE.
* - Saving currently only works without RLE.
*
*
* TODO:
* - The GIMP stores the indexed alpha channel as a separate byte,
* one for each pixel. The TGA file format spec requires that the
* alpha channel be stored as part of the colormap, not with each
* individual pixel. This means that we have no good way of
* saving and loading INDEXEDA images that use alpha channel values
* other than 0 and 255. Find a workaround.
*/
/* Set these for debugging. */
/* #define PROFILE 1 */
#include "config.h"
#ifdef PROFILE
# include <sys/times.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Round up a division to the nearest integer. */
#define ROUNDUP_DIVIDE(n,d) (((n) + (d - 1)) / (d))
typedef struct _TgaSaveVals
{
gint rle;
gint origin;
} TgaSaveVals;
static TgaSaveVals tsvals =
{
1, /* rle = ON */
1, /* origin = bottom left */
};
/* TRUEVISION-XFILE magic signature string */
static guchar magic[18] =
{
0x54, 0x52, 0x55, 0x45, 0x56, 0x49, 0x53, 0x49, 0x4f,
0x4e, 0x2d, 0x58, 0x46, 0x49, 0x4c, 0x45, 0x2e, 0x0
};
typedef struct tga_info_struct
{
guint8 idLength;
guint8 colorMapType;
guint8 imageType;
/* Known image types. */
#define TGA_TYPE_MAPPED 1
#define TGA_TYPE_COLOR 2
#define TGA_TYPE_GRAY 3
guint8 imageCompression;
/* Only known compression is RLE */
#define TGA_COMP_NONE 0
#define TGA_COMP_RLE 1
/* Color Map Specification. */
/* We need to separately specify high and low bytes to avoid endianness
and alignment problems. */
guint16 colorMapIndex;
guint16 colorMapLength;
guint8 colorMapSize;
/* Image Specification. */
guint16 xOrigin;
guint16 yOrigin;
guint16 width;
guint16 height;
guint8 bpp;
guint8 bytes;
guint8 alphaBits;
guint8 flipHoriz;
guint8 flipVert;
/* Extensions (version 2) */
/* Not all the structures described in the standard are transcribed here
only those which seem applicable to Gimp */
gchar authorName[41];
gchar comment[324];
guint month, day, year, hour, minute, second;
gchar jobName[41];
gchar softwareID[41];
guint pixelWidth, pixelHeight; /* write dpi? */
gdouble gamma;
} tga_info;
/* Declare some local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gint32 load_image (const gchar *filename);
static gint save_image (const gchar *filename,
gint32 image_ID,
gint32 drawable_ID);
static gint save_dialog (void);
static gint32 ReadImage (FILE *fp,
tga_info *info,
const gchar *filename);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
static void
query (void)
{
static GimpParamDef load_args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_STRING, "filename", "The name of the file to load" },
{ GIMP_PDB_STRING, "raw_filename", "The name entered" }
};
static GimpParamDef load_return_vals[] =
{
{ GIMP_PDB_IMAGE, "image", "Output image" }
};
static GimpParamDef save_args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image" },
{ GIMP_PDB_DRAWABLE, "drawable", "Drawable to save" },
{ GIMP_PDB_STRING, "filename", "The name of the file to save the image in" },
{ GIMP_PDB_STRING, "raw_filename", "The name of the file to save the image in" },
{ GIMP_PDB_INT32, "rle", "Use RLE compression" },
{ GIMP_PDB_INT32, "origin", "Image origin (0 = top-left, 1 = bottom-left)"}
} ;
gimp_install_procedure ("file_tga_load",
"Loads files of Targa file format",
"FIXME: write help for tga_load",
"Raphael FRANCOIS, Gordon Matzigkeit",
"Raphael FRANCOIS, Gordon Matzigkeit",
"1997",
"<Load>/TGA",
NULL,
GIMP_PLUGIN,
G_N_ELEMENTS (load_args),
G_N_ELEMENTS (load_return_vals),
load_args, load_return_vals);
gimp_install_procedure ("file_tga_save",
"saves files in the Targa file format",
"FIXME: write help for tga_save",
"Raphael FRANCOIS, Gordon Matzigkeit",
"Raphael FRANCOIS, Gordon Matzigkeit",
"1997",
"<Save>/TGA",
"RGB*, GRAY*, INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (save_args), 0,
save_args, NULL);
gimp_register_load_handler ("file_tga_load", "tga", "");
gimp_register_save_handler ("file_tga_save", "tga", "");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[2];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
gint32 image_ID;
gint32 drawable_ID;
GimpExportReturn export = GIMP_EXPORT_CANCEL;
#ifdef PROFILE
struct tms tbuf1, tbuf2;
#endif
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
if (strcmp (name, "file_tga_load") == 0)
{
#ifdef PROFILE
times (&tbuf1);
#endif
image_ID = load_image (param[1].data.d_string);
if (image_ID != -1)
{
*nreturn_vals = 2;
values[1].type = GIMP_PDB_IMAGE;
values[1].data.d_image = image_ID;
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
}
else if (strcmp (name, "file_tga_save") == 0)
{
gimp_ui_init ("tga", FALSE);
image_ID = param[1].data.d_int32;
drawable_ID = param[2].data.d_int32;
/* eventually export the image */
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
case GIMP_RUN_WITH_LAST_VALS:
export = gimp_export_image (&image_ID, &drawable_ID, "TGA",
(GIMP_EXPORT_CAN_HANDLE_RGB |
GIMP_EXPORT_CAN_HANDLE_GRAY |
GIMP_EXPORT_CAN_HANDLE_INDEXED |
GIMP_EXPORT_CAN_HANDLE_ALPHA ));
if (export == GIMP_EXPORT_CANCEL)
{
values[0].data.d_status = GIMP_PDB_CANCEL;
return;
}
break;
default:
break;
}
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data ("file_tga_save", &tsvals);
/* First acquire information with a dialog */
if (! save_dialog ())
status = GIMP_PDB_CANCEL;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 7)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
tsvals.rle = (param[5].data.d_int32) ? TRUE : FALSE;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("file_tga_save", &tsvals);
break;
default:
break;
}
#ifdef PROFILE
times (&tbuf1);
#endif
if (status == GIMP_PDB_SUCCESS)
{
if (save_image (param[3].data.d_string, image_ID, drawable_ID))
{
/* Store psvals data */
gimp_set_data ("file_tga_save", &tsvals, sizeof (tsvals));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
}
if (export == GIMP_EXPORT_EXPORT)
gimp_image_delete (image_ID);
}
else
{
status = GIMP_PDB_CALLING_ERROR;
}
values[0].data.d_status = status;
#ifdef PROFILE
times (&tbuf2);
printf ("TGA: %s profile: %ld user %ld system\n", name,
(long) tbuf2.tms_utime - tbuf1.tms_utime,
(long) tbuf2.tms_stime - tbuf2.tms_stime);
#endif
}
static gint32
load_image (const gchar *filename)
{
FILE *fp;
gchar *name_buf;
tga_info info;
guchar header[18];
guchar footer[26];
guchar extension[495];
long offset;
gint32 image_ID = -1;
fp = fopen (filename, "rb");
if (!fp)
{
g_message (_("Could not open '%s' for reading: %s"),
filename, g_strerror (errno));
return -1;
}
name_buf = g_strdup_printf (_("Opening '%s'..."), filename);
gimp_progress_init (name_buf);
g_free (name_buf);
if (!fseek (fp, -26L, SEEK_END)) { /* Is file big enough for a footer? */
if (fread (footer, sizeof (footer), 1, fp) != 1) {
g_message (_("Cannot read footer from\n'%s'"), filename);
return -1;
} else if (memcmp (footer + 8, magic, sizeof (magic)) == 0) {
/* Check the signature. */
offset= footer[0] + (footer[1] * 256) + (footer[2] * 65536)
+ (footer[3] * 16777216);
if (offset != 0) {
if (fseek (fp, offset, SEEK_SET) ||
fread (extension, sizeof (extension), 1, fp) != 1) {
g_message (_("Cannot read extension from\n'%s'"), filename);
return -1;
}
/* Eventually actually handle version 2 TGA here */
}
}
}
if (fseek (fp, 0, SEEK_SET) ||
fread (header, sizeof (header), 1, fp) != 1)
{
g_message ("Cannot read header from\n'%s'", filename);
return -1;
}
switch (header[2])
{
case 1:
info.imageType = TGA_TYPE_MAPPED;
info.imageCompression = TGA_COMP_NONE;
break;
case 2:
info.imageType = TGA_TYPE_COLOR;
info.imageCompression = TGA_COMP_NONE;
break;
case 3:
info.imageType = TGA_TYPE_GRAY;
info.imageCompression = TGA_COMP_NONE;
break;
case 9:
info.imageType = TGA_TYPE_MAPPED;
info.imageCompression = TGA_COMP_RLE;
break;
case 10:
info.imageType = TGA_TYPE_COLOR;
info.imageCompression = TGA_COMP_RLE;
break;
case 11:
info.imageType = TGA_TYPE_GRAY;
info.imageCompression = TGA_COMP_RLE;
break;
default:
info.imageType = 0;
}
info.idLength = header[0];
info.colorMapType = header[1];
info.colorMapIndex = header[3] + header[4] * 256;
info.colorMapLength = header[5] + header[6] * 256;
info.colorMapSize = header[7];
info.xOrigin = header[8] + header[9] * 256;
info.yOrigin = header[10] + header[11] * 256;
info.width = header[12] + header[13] * 256;
info.height = header[14] + header[15] * 256;
info.bpp = header[16];
info.bytes = (info.bpp + 7) / 8;
info.alphaBits = header[17] & 0x0f; /* Just the low 4 bits */
info.flipHoriz = (header[17] & 0x10) ? 1 : 0;
info.flipVert = (header[17] & 0x20) ? 0 : 1;
switch (info.imageType)
{
case TGA_TYPE_MAPPED:
if (info.bpp != 8)
{
g_message ("Unhandled sub-format in\n'%s'", filename);
return -1;
}
break;
case TGA_TYPE_COLOR:
if (info.bpp != 15 && info.bpp != 16 && info.bpp != 24
&& info.bpp != 32)
{
g_message ("Unhandled sub-format in\n'%s'", filename);
return -1;
}
break;
case TGA_TYPE_GRAY:
if (info.bpp != 8 && (info.alphaBits != 8 || (info.bpp != 16 || info.bpp != 15)))
{
g_message ("Unhandled sub-format in\n'%s'", filename);
return -1;
}
break;
default:
g_message ("Unknown image type for\n'%s'", filename);
return -1;
}
/* Plausible but unhandled formats */
if (info.bytes * 8 != info.bpp && !(info.bytes == 2 && info.bpp == 15))
{
g_message ("No support yet for TGA with these parameters");
return -1;
}
/* Check that we have a color map only when we need it. */
if (info.imageType == TGA_TYPE_MAPPED && info.colorMapType != 1)
{
g_message ("Indexed image has invalid color map type %d",
info.colorMapType);
return -1;
}
else if (info.imageType != TGA_TYPE_MAPPED && info.colorMapType != 0)
{
g_message ("Non-indexed image has invalid color map type %d",
info.colorMapType);
return -1;
}
/* Skip the image ID field. */
if (info.idLength && fseek (fp, info.idLength, SEEK_CUR))
{
g_message ("File '%s'\nis truncated or corrupted", filename);
return -1;
}
image_ID = ReadImage (fp, &info, filename);
fclose (fp);
return image_ID;
}
static void
rle_write (FILE *fp,
guchar *buffer,
guint width,
guint bytes)
{
gint repeat = 0;
gint direct = 0;
guchar *from = buffer;
gint x;
for (x = 1; x < width; ++x)
{
if (memcmp (buffer, buffer + bytes, bytes))
{
/* next pixel is different */
if (repeat)
{
putc (128 + repeat, fp);
fwrite (from, bytes, 1, fp);
from = buffer+ bytes; /* point to first different pixel */
repeat = 0;
direct = 0;
}
else
{
direct += 1;
}
}
else
{
/* next pixel is the same */
if (direct)
{
putc (direct - 1, fp);
fwrite (from, bytes, direct, fp);
from = buffer; /* point to first identical pixel */
direct = 0;
repeat = 1;
}
else
{
repeat += 1;
}
}
if (repeat == 128)
{
putc (255, fp);
fwrite (from, bytes, 1, fp);
from = buffer+ bytes;
direct = 0;
repeat = 0;
}
else if (direct == 128)
{
putc (127, fp);
fwrite (from, bytes, direct, fp);
from = buffer+ bytes;
direct = 0;
repeat = 0;
}
buffer += bytes;
}
if (repeat > 0)
{
putc (128 + repeat, fp);
fwrite (from, bytes, 1, fp);
}
else
{
putc (direct, fp);
fwrite (from, bytes, direct + 1, fp);
}
}
static gint
rle_read (FILE *fp,
guchar *buffer,
tga_info *info)
{
static gint repeat = 0;
static gint direct = 0;
static guchar sample[4];
gint head;
gint x, k;
for (x = 0; x < info->width; x++)
{
if (repeat == 0 && direct == 0)
{
head = getc (fp);
if (head == EOF)
{
return EOF;
}
else if (head >= 128)
{
repeat = head - 127;
if (fread (sample, info->bytes, 1, fp) < 1)
return EOF;
}
else
{
direct = head + 1;
}
}
if (repeat > 0)
{
for (k = 0; k < info->bytes; ++k)
{
buffer[k] = sample[k];
}
repeat--;
}
else /* direct > 0 */
{
if (fread (buffer, info->bytes, 1, fp) < 1)
return EOF;
direct--;
}
buffer += info->bytes;
}
return 0;
}
static void
flip_line (guchar *buffer,
tga_info *info)
{
guchar temp;
guchar *alt;
gint x, s;
alt = buffer + (info->bytes * (info->width - 1));
for (x = 0; x * 2 <= info->width; x++)
{
for (s = 0; s < info->bytes; ++s)
{
temp = buffer[s];
buffer[s] = alt[s];
alt[s] = temp;
}
buffer += info->bytes;
alt -= info->bytes;
}
}
/* Some people write 16-bit RGB TGA files. The spec would probably
allow 27-bit RGB too, for what it's worth, but I won't fix that
unless someone actually provides an existence proof */
static void
upsample (guchar *dest,
guchar *src,
guint width,
guint bytes,
guint8 alphaBits)
{
gint x;
for (x = 0; x < width; x++)
{
dest[0] = ((src[1] << 1) & 0xf8);
dest[0] += (dest[0] >> 5);
dest[1] = ((src[0] & 0xe0) >> 2) + ((src[1] & 0x03) << 6);
dest[1] += (dest[1] >> 5);
dest[2] = ((src[0] << 3) & 0xf8);
dest[2] += (dest[2] >> 5);
switch (alphaBits)
{
case 1:
dest[3] = (src[1] & 0x80)? 0: 255;
dest += 4;
break;
default:
dest += 3;
}
src += bytes;
}
}
static void
bgr2rgb (guchar *dest,
guchar *src,
guint width,
guint bytes,
guint alpha)
{
guint x;
if (alpha)
{
for (x = 0; x < width; x++)
{
*(dest++) = src[2];
*(dest++) = src[1];
*(dest++) = src[0];
*(dest++) = src[3];
src += bytes;
}
}
else
{
for (x = 0; x < width; x++)
{
*(dest++) = src[2];
*(dest++) = src[1];
*(dest++) = src[0];
src += bytes;
}
}
}
static void
read_line (FILE *fp,
guchar *row,
guchar *buffer,
tga_info *info,
GimpDrawable *drawable)
{
if (info->imageCompression == TGA_COMP_RLE)
{
rle_read (fp, buffer, info);
}
else
{
fread (buffer, info->bytes, info->width, fp);
}
if (info->flipHoriz)
{
flip_line (buffer, info);
}
if (info->imageType == TGA_TYPE_COLOR)
{
if (info->bpp == 16 || info->bpp == 15)
{
upsample (row, buffer, info->width, info->bytes, info->alphaBits);
}
else
{
bgr2rgb (row, buffer,info->width,info->bytes,info->alphaBits);
}
}
else
{
memcpy (row, buffer, info->width * drawable->bpp);
}
}
static gint32
ReadImage (FILE *fp,
tga_info *info,
const gchar *filename)
{
static gint32 image_ID;
gint32 layer_ID;
GimpPixelRgn pixel_rgn;
GimpDrawable *drawable;
guchar *data, *buffer, *row;
GimpImageType dtype = 0;
GimpImageBaseType itype = 0;
gint i, y;
gint max_tileheight, tileheight;
guint cmap_bytes;
guchar tga_cmap[4 * 256], gimp_cmap[3 * 256];
switch (info->imageType)
{
case TGA_TYPE_MAPPED:
itype = GIMP_INDEXED;
if (info->alphaBits)
dtype = GIMP_INDEXEDA_IMAGE;
else
dtype = GIMP_INDEXED_IMAGE;
break;
case TGA_TYPE_GRAY:
itype = GIMP_GRAY;
if (info->alphaBits)
dtype = GIMP_GRAYA_IMAGE;
else
dtype = GIMP_GRAY_IMAGE;
break;
case TGA_TYPE_COLOR:
itype = GIMP_RGB;
if (info->alphaBits)
dtype = GIMP_RGBA_IMAGE;
else
dtype = GIMP_RGB_IMAGE;
break;
}
/* Handle colormap */
if (info->colorMapType == 1)
{
cmap_bytes= (info->colorMapSize + 7 ) / 8;
if (cmap_bytes <= 4 &&
fread (tga_cmap, info->colorMapLength * cmap_bytes, 1, fp) == 1)
{
if (info->colorMapSize == 32)
bgr2rgb(gimp_cmap, tga_cmap, info->colorMapLength, cmap_bytes, 1);
else if (info->colorMapSize == 24)
bgr2rgb(gimp_cmap, tga_cmap, info->colorMapLength, cmap_bytes, 0);
else if (info->colorMapSize == 16 || info->colorMapSize == 15)
upsample(gimp_cmap, tga_cmap, info->colorMapLength, cmap_bytes, info->alphaBits);
}
else
{
g_message ("File '%s'\nis truncated or corrupted", filename);
return -1;
}
}
image_ID = gimp_image_new (info->width, info->height, itype);
gimp_image_set_filename (image_ID, filename);
if (info->colorMapType == 1)
gimp_image_set_cmap(image_ID, gimp_cmap, info->colorMapLength);
layer_ID = gimp_layer_new (image_ID,
_("Background"),
info->width, info->height,
dtype, 100,
GIMP_NORMAL_MODE);
gimp_image_add_layer (image_ID, layer_ID, 0);
drawable = gimp_drawable_get (layer_ID);
/* Prepare the pixel region. */
gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0,
info->width, info->height, TRUE, FALSE);
/* Allocate the data. */
max_tileheight = gimp_tile_height ();
data = (guchar *) g_malloc (info->width * max_tileheight * drawable->bpp);
buffer = (guchar *) g_malloc (info->width * info->bytes);
if (info->flipVert)
{
for (i = 0; i < info->height; i += tileheight)
{
tileheight = i ? max_tileheight : (info->height % max_tileheight);
if (tileheight == 0) tileheight= max_tileheight;
for (y= 1; y <= tileheight; ++y)
{
row= data + (info->width * drawable->bpp * (tileheight - y));
read_line(fp, row, buffer, info, drawable);
}
gimp_progress_update ((double) (i + tileheight) /
(double) info->height);
gimp_pixel_rgn_set_rect (&pixel_rgn, data, 0,
info->height - i - tileheight,
info->width, tileheight);
}
}
else
{
for (i = 0; i < info->height; i += max_tileheight)
{
tileheight = MIN (max_tileheight, info->height - i);
for (y= 0; y < tileheight; ++y)
{
row= data + (info->width * drawable->bpp * y);
read_line(fp, row, buffer, info, drawable);
}
gimp_progress_update ((double) (i + tileheight) /
(double) info->height);
gimp_pixel_rgn_set_rect (&pixel_rgn, data, 0, i,
info->width, tileheight);
}
}
g_free (data);
g_free (buffer);
gimp_drawable_flush (drawable);
gimp_drawable_detach (drawable);
return image_ID;
} /*read_image*/
static gint
save_image (const gchar *filename,
gint32 image_ID,
gint32 drawable_ID)
{
GimpPixelRgn pixel_rgn;
GimpDrawable *drawable;
GimpImageType dtype;
gint width;
gint height;
FILE *fp;
gchar *name_buf;
gint tileheight;
gint out_bpp = 0;
gboolean status = TRUE;
gint i, row;
guchar header[18];
guchar footer[26];
guchar *pixels;
guchar *data;
gint num_colors;
guchar *gimp_cmap = NULL;
drawable = gimp_drawable_get (drawable_ID);
dtype = gimp_drawable_type (drawable_ID);
width = drawable->width;
height = drawable->height;
if ((fp = fopen (filename, "wb")) == NULL)
{
g_message ("Could not open '%s' for writing: %s",
filename, g_strerror (errno));
return FALSE;
}
name_buf = g_strdup_printf (_("Saving '%s'..."), filename);
gimp_progress_init (name_buf);
g_free (name_buf);
header[0] = 0; /* No image identifier / description */
if (dtype == GIMP_INDEXED_IMAGE || dtype == GIMP_INDEXEDA_IMAGE)
{
gimp_cmap = gimp_image_get_cmap (image_ID, &num_colors);
header[1] = 1; /* cmap type */
header[2] = (tsvals.rle) ? 9 : 1;
header[3] = header[4]= 0; /* no offset */
header[5] = num_colors % 256;
header[6] = num_colors / 256;
header[7] = 24; /* cmap size / bits */
}
else
{
header[1]= 0;
if (dtype == GIMP_RGB_IMAGE || dtype == GIMP_RGBA_IMAGE)
{
header[2]= (tsvals.rle) ? 10 : 2;
}
else
{
header[2]= (tsvals.rle) ? 11 : 3;
}
header[3] = header[4] = header[5] = header[6] = header[7] = 0;
}
header[8] = header[9] = 0; /* xorigin */
header[10] = header[11] = 0; /* yorigin */
header[12] = width % 256;
header[13] = width / 256;
header[14] = height % 256;
header[15] = height / 256;
switch (dtype)
{
case GIMP_INDEXED_IMAGE:
case GIMP_GRAY_IMAGE:
case GIMP_INDEXEDA_IMAGE:
out_bpp = 1;
header[16] = 8; /* bpp */
header[17] = (tsvals.origin) ? 0 : 0x20; /* alpha + orientation */
break;
case GIMP_GRAYA_IMAGE:
out_bpp = 2;
header[16] = 16; /* bpp */
header[17] = (tsvals.origin) ? 8 : 0x28; /* alpha + orientation */
break;
case GIMP_RGB_IMAGE:
out_bpp = 3;
header[16] = 24; /* bpp */
header[17] = (tsvals.origin) ? 0 : 0x20; /* alpha + orientation */
break;
case GIMP_RGBA_IMAGE:
out_bpp = 4;
header[16] = 32; /* bpp */
header[17] = (tsvals.origin) ? 8 : 0x28; /* alpha + orientation */
break;
}
/* write header to front of file */
fwrite (header, sizeof (header), 1, fp);
if (dtype == GIMP_INDEXED_IMAGE || dtype == GIMP_INDEXEDA_IMAGE)
{
/* write out palette */
for (i= 0; i < num_colors; ++i)
{
fputc (gimp_cmap[(i * 3) + 2], fp);
fputc (gimp_cmap[(i * 3) + 1], fp);
fputc (gimp_cmap[(i * 3) + 0], fp);
}
}
/* Allocate a new set of pixels. */
tileheight = gimp_tile_height ();
gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0, width, height, FALSE, FALSE);
pixels = g_new (guchar, width * drawable->bpp);
data = g_new (guchar, width * out_bpp);
for (row = 0; row < height; ++row)
{
if(tsvals.origin)
{
gimp_pixel_rgn_get_rect (&pixel_rgn, pixels, 0, height-(row+1), width, 1);
}
else
{
gimp_pixel_rgn_get_rect (&pixel_rgn, pixels, 0, row, width, 1);
}
if (dtype == GIMP_RGB_IMAGE)
{
bgr2rgb(data, pixels, width, drawable->bpp, 0);
}
else if (dtype == GIMP_RGBA_IMAGE)
{
bgr2rgb(data, pixels, width, drawable->bpp, 1);
}
else if (dtype == GIMP_INDEXEDA_IMAGE)
{
for (i = 0; i < width; ++i)
{
data[i]= pixels[i*2];
}
}
else
{
memcpy (data, pixels, width * drawable->bpp);
}
if (tsvals.rle)
{
rle_write (fp, data, width, out_bpp);
}
else
{
fwrite (data, width * out_bpp, 1, fp);
}
gimp_progress_update ((gdouble) row / (gdouble) height);
}
gimp_drawable_detach (drawable);
g_free (data);
/* footer must be the last thing written to file */
memset (footer, 0, 8); /* No extensions, no developer directory */
memcpy (footer + 8, magic, sizeof (magic)); /* magic signature */
fwrite (footer, sizeof (footer), 1, fp);
fclose (fp);
return status;
}
static gint
save_dialog (void)
{
GtkWidget *dlg;
GtkWidget *toggle;
GtkWidget *origin;
GtkWidget *frame;
GtkWidget *vbox;
gboolean run;
dlg = gimp_dialog_new (_("Save as TGA"), "tga",
NULL, 0,
gimp_standard_help_func, "filters/tga.html",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
/* regular tga parameter settings */
frame = gtk_frame_new (_("Targa Options"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
gtk_container_add (GTK_CONTAINER (frame), vbox);
/* rle */
toggle = gtk_check_button_new_with_mnemonic (_("_RLE compression"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), tsvals.rle);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&tsvals.rle);
/* origin */
origin = gtk_check_button_new_with_mnemonic (_("Or_igin at bottom left"));
gtk_box_pack_start (GTK_BOX (vbox), origin, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (origin), tsvals.origin);
gtk_widget_show (origin);
g_signal_connect (origin, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&tsvals.origin);
gtk_widget_show (vbox);
gtk_widget_show (frame);
gtk_widget_show (dlg);
run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dlg);
return run;
}
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