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gimp/plug-ins/common/file-tga.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* TrueVision Targa loading and exporting file filter for 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 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/>.
*/
/*
* Modified 2007-07-20, Raphaël Quinet <raphael@gimp.org>:
* - Workaround for loading indexed images with full alpha channel.
* - Bug fix: save_image() was saving uninitialized tile data for
* indexed images with alpha.
*
* 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:
* - Handle TGA images with version 2 extensions (image comment,
* resolution, date, ...).
* - 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. Workaround implemented for loading by
* promoting the image to RGBA, but saving indexed TGA images with
* full alpha information in the coloramp is not supported yet (only
* one fully transparent color is allowed in INDEXEDA mode).
*/
/* Set these for debugging. */
/* #define PROFILE 1 */
#include "config.h"
#ifdef PROFILE
# include <sys/times.h>
#endif
#include <errno.h>
#include <string.h>
#include <glib/gstdio.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define LOAD_PROC "file-tga-load"
#define SAVE_PROC "file-tga-save"
#define PLUG_IN_BINARY "file-tga"
#define PLUG_IN_ROLE "gimp-file-tga"
typedef enum
{
ORIGIN_TOP_LEFT = 0,
ORIGIN_BOTTOM_LEFT = 1
} TgaOrigin;
typedef struct _TgaSaveVals
{
gboolean rle;
TgaOrigin origin;
} TgaSaveVals;
static TgaSaveVals tsvals =
{
TRUE, /* rle */
ORIGIN_BOTTOM_LEFT /* origin */
};
/* 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,
GError **error);
static gint save_image (const gchar *filename,
gint32 image_ID,
gint32 drawable_ID,
GError **error);
static gboolean save_dialog (void);
static gint32 ReadImage (FILE *fp,
tga_info *info,
const gchar *filename);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
static void
query (void)
{
static const GimpParamDef load_args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ GIMP_PDB_STRING, "filename", "The name of the file to load" },
{ GIMP_PDB_STRING, "raw-filename", "The name entered" }
};
static const GimpParamDef load_return_vals[] =
{
{ GIMP_PDB_IMAGE, "image", "Output image" }
};
static const GimpParamDef save_args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ GIMP_PDB_IMAGE, "image", "Input image" },
{ GIMP_PDB_DRAWABLE, "drawable", "Drawable to export" },
{ GIMP_PDB_STRING, "filename", "The name of the file to export the image in" },
{ GIMP_PDB_STRING, "raw-filename", "The name of the file to export 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 (LOAD_PROC,
"Loads files of Targa file format",
"FIXME: write help for tga_load",
"Raphael FRANCOIS, Gordon Matzigkeit",
"Raphael FRANCOIS, Gordon Matzigkeit",
"1997,2000,2007",
N_("TarGA image"),
NULL,
GIMP_PLUGIN,
G_N_ELEMENTS (load_args),
G_N_ELEMENTS (load_return_vals),
load_args, load_return_vals);
gimp_register_file_handler_mime (LOAD_PROC, "image/x-tga");
gimp_register_magic_load_handler (LOAD_PROC,
"tga,vda,icb,vst",
"",
"-18&,string,TRUEVISION-XFILE.,-1,byte,0");
gimp_install_procedure (SAVE_PROC,
"exports files in the Targa file format",
"FIXME: write help for tga_save",
"Raphael FRANCOIS, Gordon Matzigkeit",
"Raphael FRANCOIS, Gordon Matzigkeit",
"1997,2000",
N_("TarGA image"),
"RGB*, GRAY*, INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (save_args), 0,
save_args, NULL);
gimp_register_file_handler_mime (SAVE_PROC, "image/x-tga");
gimp_register_save_handler (SAVE_PROC, "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;
GError *error = NULL;
#ifdef PROFILE
struct tms tbuf1, tbuf2;
#endif
INIT_I18N ();
gegl_init (NULL, NULL);
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
if (strcmp (name, LOAD_PROC) == 0)
{
GFile *file = g_file_new_for_uri (param[1].data.d_string);
#ifdef PROFILE
times (&tbuf1);
#endif
image_ID = load_image (g_file_get_path (file), &error);
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, SAVE_PROC) == 0)
{
GFile *file = g_file_new_for_uri (param[3].data.d_string);
gimp_ui_init (PLUG_IN_BINARY, 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 (SAVE_PROC, &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 (SAVE_PROC, &tsvals);
break;
default:
break;
}
#ifdef PROFILE
times (&tbuf1);
#endif
if (status == GIMP_PDB_SUCCESS)
{
if (save_image (g_file_get_path (file),
image_ID, drawable_ID,
&error))
{
/* Store psvals data */
gimp_set_data (SAVE_PROC, &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;
}
if (status != GIMP_PDB_SUCCESS && error)
{
*nreturn_vals = 2;
values[1].type = GIMP_PDB_STRING;
values[1].data.d_string = error->message;
}
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,
GError **error)
{
FILE *fp;
tga_info info;
guchar header[18];
guchar footer[26];
guchar extension[495];
long offset;
gint32 image_ID = -1;
gimp_progress_init_printf (_("Opening '%s'"),
gimp_filename_to_utf8 (filename));
fp = g_fopen (filename, "rb");
if (! fp)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for reading: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
return -1;
}
/* Is file big enough for a footer? */
if (!fseek (fp, -26L, SEEK_END))
{
if (fread (footer, sizeof (footer), 1, fp) != 1)
{
g_message (_("Cannot read footer from '%s'"),
gimp_filename_to_utf8 (filename));
return -1;
}
else if (memcmp (footer + 8, magic, sizeof (magic)) == 0)
{
/* Check the signature. */
offset = (footer[0] +
footer[1] * 256L +
footer[2] * 65536L +
footer[3] * 16777216L);
if (offset != 0)
{
if (fseek (fp, offset, SEEK_SET) ||
fread (extension, sizeof (extension), 1, fp) != 1)
{
g_message (_("Cannot read extension from '%s'"),
gimp_filename_to_utf8 (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 '%s'"),
gimp_filename_to_utf8 (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;
/* hack to handle some existing files with incorrect headers, see bug #306675 */
if (info.alphaBits == info.bpp)
info.alphaBits = 0;
/* hack to handle yet another flavor of incorrect headers, see bug #540969 */
if (info.alphaBits == 0)
{
if (info.imageType == TGA_TYPE_COLOR && info.bpp == 32)
info.alphaBits = 8;
if (info.imageType == TGA_TYPE_GRAY && info.bpp == 16)
info.alphaBits = 8;
}
switch (info.imageType)
{
case TGA_TYPE_MAPPED:
if (info.bpp != 8)
{
g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u)",
gimp_filename_to_utf8 (filename),
info.imageType, info.bpp);
return -1;
}
break;
case TGA_TYPE_COLOR:
if ((info.bpp != 15 && info.bpp != 16 &&
info.bpp != 24 && info.bpp != 32) ||
((info.bpp == 15 || info.bpp == 24) &&
info.alphaBits != 0) ||
(info.bpp == 16 && info.alphaBits != 1 &&
info.alphaBits != 0) ||
(info.bpp == 32 && info.alphaBits != 8))
{
g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u, alpha = %u)",
gimp_filename_to_utf8 (filename),
info.imageType, info.bpp, info.alphaBits);
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 '%s' (type = %u, bpp = %u)",
gimp_filename_to_utf8 (filename),
info.imageType, info.bpp);
return -1;
}
break;
default:
g_message ("Unknown image type %u for '%s'",
info.imageType, gimp_filename_to_utf8 (filename));
return -1;
}
/* Plausible but unhandled formats */
if (info.bytes * 8 != info.bpp && info.bpp != 15)
{
g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u)",
gimp_filename_to_utf8 (filename),
info.imageType, info.bpp);
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 %u",
info.colorMapType);
return -1;
}
else if (info.imageType != TGA_TYPE_MAPPED && info.colorMapType != 0)
{
g_message ("Non-indexed image has invalid color map type %u",
info.colorMapType);
return -1;
}
/* Skip the image ID field. */
if (info.idLength && fseek (fp, info.idLength, SEEK_CUR))
{
g_message ("File '%s' is truncated or corrupted",
gimp_filename_to_utf8 (filename));
return -1;
}
image_ID = ReadImage (fp, &info, filename);
fclose (fp);
return image_ID;
}
static void
rle_write (FILE *fp,
guchar *buf,
guint width,
guint bytes)
{
gint repeat = 0;
gint direct = 0;
guchar *from = buf;
guint x;
for (x = 1; x < width; ++x)
{
if (memcmp (buf, buf + bytes, bytes))
{
/* next pixel is different */
if (repeat)
{
putc (128 + repeat, fp);
fwrite (from, bytes, 1, fp);
from = buf + 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 = buf; /* point to first identical pixel */
direct = 0;
repeat = 1;
}
else
{
repeat += 1;
}
}
if (repeat == 128)
{
putc (255, fp);
fwrite (from, bytes, 1, fp);
from = buf + bytes;
direct = 0;
repeat = 0;
}
else if (direct == 128)
{
putc (127, fp);
fwrite (from, bytes, direct, fp);
from = buf+ bytes;
direct = 0;
repeat = 0;
}
buf += 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 *buf,
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)
{
buf[k] = sample[k];
}
repeat--;
}
else /* direct > 0 */
{
if (fread (buf, info->bytes, 1, fp) < 1)
return EOF;
direct--;
}
buf += info->bytes;
}
return 0;
}
static void
flip_line (guchar *buf,
tga_info *info)
{
guchar temp;
guchar *alt;
gint x, s;
alt = buf + (info->bytes * (info->width - 1));
for (x = 0; x * 2 < info->width; x++)
{
for (s = 0; s < info->bytes; ++s)
{
temp = buf[s];
buf[s] = alt[s];
alt[s] = temp;
}
buf += 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,
const guchar *src,
guint width,
guint bytes,
guint alpha)
{
guint 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);
if (alpha)
{
dest[3] = (src[1] & 0x80) ? 255 : 0;
dest += 4;
}
else
{
dest += 3;
}
src += bytes;
}
}
static void
bgr2rgb (guchar *dest,
const 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
apply_colormap (guchar *dest,
const guchar *src,
guint width,
const guchar *cmap,
gboolean alpha,
guint16 index)
{
guint x;
if (alpha)
{
for (x = 0; x < width; x++)
{
*(dest++) = cmap[(*src - index) * 4];
*(dest++) = cmap[(*src - index) * 4 + 1];
*(dest++) = cmap[(*src - index) * 4 + 2];
*(dest++) = cmap[(*src - index) * 4 + 3];
src++;
}
}
else
{
for (x = 0; x < width; x++)
{
*(dest++) = cmap[(*src - index) * 3];
*(dest++) = cmap[(*src - index) * 3 + 1];
*(dest++) = cmap[(*src - index) * 3 + 2];
src++;
}
}
}
static void
apply_index (guchar *dest,
const guchar *src,
guint width,
guint16 index)
{
guint x;
for (x = 0; x < width; x++)
{
*(dest++) = *(src++) - index;
}
}
static void
read_line (FILE *fp,
guchar *row,
guchar *buf,
tga_info *info,
gint bpp,
const guchar *convert_cmap)
{
if (info->imageCompression == TGA_COMP_RLE)
{
rle_read (fp, buf, info);
}
else
{
fread (buf, info->bytes, info->width, fp);
}
if (info->flipHoriz)
{
flip_line (buf, info);
}
if (info->imageType == TGA_TYPE_COLOR)
{
if (info->bpp == 16 || info->bpp == 15)
{
upsample (row, buf, info->width, info->bytes, info->alphaBits);
}
else
{
bgr2rgb (row, buf, info->width, info->bytes, info->alphaBits);
}
}
else if (convert_cmap)
{
gboolean has_alpha = (info->alphaBits > 0);
apply_colormap (row, buf, info->width, convert_cmap, has_alpha,
info->colorMapIndex);
}
else if (info->imageType == TGA_TYPE_MAPPED)
{
g_assert (bpp == 1);
apply_index (row, buf, info->width, info->colorMapIndex);
}
else
{
memcpy (row, buf, info->width * bpp);
}
}
static gint32
ReadImage (FILE *fp,
tga_info *info,
const gchar *filename)
{
static gint32 image_ID;
gint32 layer_ID;
GeglBuffer *buffer;
guchar *data, *buf, *row;
GimpImageType dtype = 0;
GimpImageBaseType itype = 0;
gint bpp;
gint i, y;
gint max_tileheight, tileheight;
guint cmap_bytes = 0;
guchar *tga_cmap = NULL;
guchar *gimp_cmap = NULL;
guchar *convert_cmap = NULL;
switch (info->imageType)
{
case TGA_TYPE_MAPPED:
cmap_bytes = (info->colorMapSize + 7 ) / 8;
tga_cmap = g_new (guchar, info->colorMapLength * cmap_bytes);
if (info->colorMapSize > 24)
{
/* indexed + full alpha => promoted to RGBA */
itype = GIMP_RGB;
dtype = GIMP_RGBA_IMAGE;
convert_cmap = g_new (guchar, info->colorMapLength * 4);
}
else if (info->colorMapIndex + info->colorMapLength > 256)
{
/* more than 256 colormap entries => promoted to RGB */
itype = GIMP_RGB;
dtype = GIMP_RGB_IMAGE;
convert_cmap = g_new (guchar, info->colorMapLength * 3);
}
else if (info->alphaBits > 0)
{
/* if alpha exists here, promote to RGB */
itype = GIMP_RGB;
dtype = GIMP_RGBA_IMAGE;
convert_cmap = g_new (guchar, info->colorMapLength * 4);
}
else
{
itype = GIMP_INDEXED;
dtype = GIMP_INDEXED_IMAGE;
gimp_cmap = g_new (guchar, info->colorMapLength * 3);
}
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->imageType == TGA_TYPE_MAPPED)
{
if (cmap_bytes <= 4 &&
fread (tga_cmap, info->colorMapLength * cmap_bytes, 1, fp) == 1)
{
if (convert_cmap)
{
if (info->colorMapSize == 32)
bgr2rgb (convert_cmap, tga_cmap,
info->colorMapLength, cmap_bytes, 1);
else if (info->colorMapSize == 24)
bgr2rgb (convert_cmap, tga_cmap,
info->colorMapLength, cmap_bytes, 0);
else if (info->colorMapSize == 16 || info->colorMapSize == 15)
upsample (convert_cmap, tga_cmap,
info->colorMapLength, cmap_bytes, info->alphaBits);
else
{
g_message ("Unsupported colormap depth: %u",
info->colorMapSize);
return -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 ("Unsupported colormap depth: %u",
info->colorMapSize);
return -1;
}
}
}
else
{
g_message ("File '%s' is truncated or corrupted",
gimp_filename_to_utf8 (filename));
return -1;
}
}
image_ID = gimp_image_new (info->width, info->height, itype);
gimp_image_set_filename (image_ID, filename);
if (gimp_cmap)
gimp_image_set_colormap (image_ID, gimp_cmap, info->colorMapLength);
layer_ID = gimp_layer_new (image_ID,
_("Background"),
info->width, info->height,
dtype,
100,
gimp_image_get_default_new_layer_mode (image_ID));
gimp_image_insert_layer (image_ID, layer_ID, -1, 0);
buffer = gimp_drawable_get_buffer (layer_ID);
bpp = gimp_drawable_bpp (layer_ID);
/* Allocate the data. */
max_tileheight = gimp_tile_height ();
data = g_new (guchar, info->width * max_tileheight * bpp);
buf = g_new (guchar, 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 * bpp * (tileheight - y));
read_line (fp, row, buf, info, bpp, convert_cmap);
}
gegl_buffer_set (buffer,
GEGL_RECTANGLE (0, info->height - i - tileheight,
info->width, tileheight), 0,
NULL, data, GEGL_AUTO_ROWSTRIDE);
gimp_progress_update ((gdouble) (i + tileheight) /
(gdouble) info->height);
}
}
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 * bpp * y);
read_line (fp, row, buf, info, bpp, convert_cmap);
}
gegl_buffer_set (buffer,
GEGL_RECTANGLE (0, i, info->width, tileheight), 0,
NULL, data, GEGL_AUTO_ROWSTRIDE);
gimp_progress_update ((gdouble) (i + tileheight) /
(gdouble) info->height);
}
}
g_free (data);
g_free (buf);
g_free (convert_cmap);
g_free (gimp_cmap);
g_free (tga_cmap);
g_object_unref (buffer);
gimp_progress_update (1.0);
return image_ID;
}
static gboolean
save_image (const gchar *filename,
gint32 image_ID,
gint32 drawable_ID,
GError **error)
{
GeglBuffer *buffer;
const Babl *format = NULL;
GimpImageType dtype;
gint width;
gint height;
FILE *fp;
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;
buffer = gimp_drawable_get_buffer (drawable_ID);
dtype = gimp_drawable_type (drawable_ID);
width = gegl_buffer_get_width (buffer);
height = gegl_buffer_get_height (buffer);
gimp_progress_init_printf (_("Exporting '%s'"),
gimp_filename_to_utf8 (filename));
if ((fp = g_fopen (filename, "wb")) == NULL)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for writing: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
return FALSE;
}
header[0] = 0; /* No image identifier / description */
if (dtype == GIMP_INDEXED_IMAGE)
{
gimp_cmap = gimp_image_get_colormap (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 if (dtype == GIMP_INDEXEDA_IMAGE)
{
gimp_cmap = gimp_image_get_colormap (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 + 1) % 256;
header[6] = (num_colors + 1) / 256;
header[7] = 32; /* 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] = tsvals.origin ? 0 : (height % 256); /* yorigin */
header[11] = tsvals.origin ? 0 : (height / 256); /* 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_INDEXEDA_IMAGE:
format = NULL;
out_bpp = 1;
header[16] = 8; /* bpp */
header[17] = tsvals.origin ? 0 : 0x20; /* alpha + orientation */
break;
case GIMP_GRAY_IMAGE:
format = babl_format ("Y' u8");
out_bpp = 1;
header[16] = 8; /* bpp */
header[17] = tsvals.origin ? 0 : 0x20; /* alpha + orientation */
break;
case GIMP_GRAYA_IMAGE:
format = babl_format ("Y'A u8");
out_bpp = 2;
header[16] = 16; /* bpp */
header[17] = tsvals.origin ? 8 : 0x28; /* alpha + orientation */
break;
case GIMP_RGB_IMAGE:
format = babl_format ("R'G'B' u8");
out_bpp = 3;
header[16] = 24; /* bpp */
header[17] = tsvals.origin ? 0 : 0x20; /* alpha + orientation */
break;
case GIMP_RGBA_IMAGE:
format = babl_format ("R'G'B'A u8");
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)
{
/* 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);
}
}
else if (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);
fputc (255, fp);
}
fputc (0, fp);
fputc (0, fp);
fputc (0, fp);
fputc (0, fp);
}
pixels = g_new (guchar, width * out_bpp);
data = g_new (guchar, width * out_bpp);
for (row = 0; row < height; ++row)
{
if (tsvals.origin)
{
gegl_buffer_get (buffer,
GEGL_RECTANGLE (0, height - (row + 1), width, 1), 1.0,
format, pixels,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
}
else
{
gegl_buffer_get (buffer,
GEGL_RECTANGLE (0, row, width, 1), 1.0,
format, pixels,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
}
if (dtype == GIMP_RGB_IMAGE)
{
bgr2rgb (data, pixels, width, out_bpp, 0);
}
else if (dtype == GIMP_RGBA_IMAGE)
{
bgr2rgb (data, pixels, width, out_bpp, 1);
}
else if (dtype == GIMP_INDEXEDA_IMAGE)
{
for (i = 0; i < width; ++i)
{
if (pixels[i * 2 + 1] > 127)
data[i] = pixels[i * 2];
else
data[i] = num_colors;
}
}
else
{
memcpy (data, pixels, width * out_bpp);
}
if (tsvals.rle)
{
rle_write (fp, data, width, out_bpp);
}
else
{
fwrite (data, width * out_bpp, 1, fp);
}
if (row % 16 == 0)
gimp_progress_update ((gdouble) row / (gdouble) height);
}
g_object_unref (buffer);
g_free (data);
g_free (pixels);
/* 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);
gimp_progress_update (1.0);
return status;
}
static gboolean
save_dialog (void)
{
GtkWidget *dialog;
GtkWidget *label;
GtkWidget *toggle;
GtkWidget *combo;
GtkWidget *vbox;
GtkWidget *hbox;
gboolean run;
dialog = gimp_export_dialog_new (_("TGA"), PLUG_IN_BINARY, SAVE_PROC);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_box_pack_start (GTK_BOX (gimp_export_dialog_get_content_area (dialog)),
vbox, TRUE, TRUE, 0);
gtk_widget_show (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 */
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
label = gtk_label_new_with_mnemonic (_("Or_igin:"));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
combo = gimp_int_combo_box_new (_("Bottom left"), ORIGIN_BOTTOM_LEFT,
_("Top left"), ORIGIN_TOP_LEFT,
NULL);
gtk_box_pack_start (GTK_BOX (hbox), combo, TRUE, TRUE, 0);
gtk_widget_show (combo);
gtk_label_set_mnemonic_widget (GTK_LABEL (label), combo);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo),
tsvals.origin,
G_CALLBACK (gimp_int_combo_box_get_active),
&tsvals.origin, NULL);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
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