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

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Farbfeld Image Format plug-in
*
* Copyright (C) 2023 Alex S.
*
* 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/>.
*/
#include "config.h"
#include <string.h>
#include <errno.h>
#include <glib/gstdio.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define LOAD_PROC "file-farbfeld-load"
#define EXPORT_PROC "file-farbfeld-export"
#define PLUG_IN_BINARY "file-farbfeld"
#define PLUG_IN_ROLE "gimp-file-farbfeld"
typedef struct _Farbfeld Farbfeld;
typedef struct _FarbfeldClass FarbfeldClass;
struct _Farbfeld
{
GimpPlugIn parent_instance;
};
struct _FarbfeldClass
{
GimpPlugInClass parent_class;
};
#define FARBFELD_TYPE (farbfeld_get_type ())
#define FARBFELD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), FARBFELD_TYPE, Farbfeld))
GType farbfeld_get_type (void) G_GNUC_CONST;
static GList * farbfeld_query_procedures (GimpPlugIn *plug_in);
static GimpProcedure * farbfeld_create_procedure (GimpPlugIn *plug_in,
const gchar *name);
static GimpValueArray * farbfeld_load (GimpProcedure *procedure,
GimpRunMode run_mode,
GFile *file,
GimpMetadata *metadata,
GimpMetadataLoadFlags *flags,
GimpProcedureConfig *config,
gpointer run_data);
static GimpValueArray * farbfeld_export (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
GFile *file,
GimpExportOptions *options,
GimpMetadata *metadata,
GimpProcedureConfig *config,
gpointer run_data);
static GimpImage * load_image (GFile *file,
GObject *config,
GimpRunMode run_mode,
GError **error);
static gboolean export_image (GFile *file,
GimpImage *image,
GimpDrawable *drawable,
GError **error);
G_DEFINE_TYPE (Farbfeld, farbfeld, GIMP_TYPE_PLUG_IN)
GIMP_MAIN (FARBFELD_TYPE)
DEFINE_STD_SET_I18N
static void
farbfeld_class_init (FarbfeldClass *klass)
{
GimpPlugInClass *plug_in_class = GIMP_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = farbfeld_query_procedures;
plug_in_class->create_procedure = farbfeld_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
farbfeld_init (Farbfeld *farbfeld)
{
}
static GList *
farbfeld_query_procedures (GimpPlugIn *plug_in)
{
GList *list = NULL;
list = g_list_append (list, g_strdup (LOAD_PROC));
list = g_list_append (list, g_strdup (EXPORT_PROC));
return list;
}
static GimpProcedure *
farbfeld_create_procedure (GimpPlugIn *plug_in,
const gchar *name)
{
GimpProcedure *procedure = NULL;
if (! strcmp (name, LOAD_PROC))
{
procedure = gimp_load_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
farbfeld_load, NULL, NULL);
gimp_procedure_set_menu_label (procedure,
N_("Farbfeld"));
gimp_procedure_set_documentation (procedure,
_("Load file in the Farbfeld file "
"format"),
_("Load file in the Farbfeld file "
"format"),
name);
gimp_procedure_set_attribution (procedure,
"Alex S.",
"Alex S.",
"2023");
gimp_file_procedure_set_extensions (GIMP_FILE_PROCEDURE (procedure),
"ff");
gimp_file_procedure_set_magics (GIMP_FILE_PROCEDURE (procedure),
"0,string,farbfeld");
}
else if (! strcmp (name, EXPORT_PROC))
{
procedure = gimp_export_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
FALSE, farbfeld_export, NULL, NULL);
gimp_procedure_set_image_types (procedure, "*");
gimp_procedure_set_menu_label (procedure, _("Farbfeld"));
gimp_procedure_set_documentation (procedure,
_("Export image in the Farbfeld file "
"format"),
_("Export image in the Farbfeld file "
"format"),
name);
gimp_procedure_set_attribution (procedure,
"Alex S.",
"Alex S.",
"2023");
gimp_file_procedure_set_extensions (GIMP_FILE_PROCEDURE (procedure),
"ff");
gimp_export_procedure_set_capabilities (GIMP_EXPORT_PROCEDURE (procedure),
GIMP_EXPORT_CAN_HANDLE_RGB |
GIMP_EXPORT_CAN_HANDLE_GRAY |
GIMP_EXPORT_CAN_HANDLE_INDEXED |
GIMP_EXPORT_CAN_HANDLE_ALPHA,
NULL, NULL, NULL);
}
return procedure;
}
static GimpValueArray *
farbfeld_load (GimpProcedure *procedure,
GimpRunMode run_mode,
GFile *file,
GimpMetadata *metadata,
GimpMetadataLoadFlags *flags,
GimpProcedureConfig *config,
gpointer run_data)
{
GimpValueArray *return_vals;
GimpImage *image;
GError *error = NULL;
gegl_init (NULL, NULL);
image = load_image (file, G_OBJECT (config), run_mode, &error);
if (! image)
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_EXECUTION_ERROR,
error);
return_vals = gimp_procedure_new_return_values (procedure,
GIMP_PDB_SUCCESS,
NULL);
GIMP_VALUES_SET_IMAGE (return_vals, 1, image);
return return_vals;
}
static GimpValueArray *
farbfeld_export (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
GFile *file,
GimpExportOptions *options,
GimpMetadata *metadata,
GimpProcedureConfig *config,
gpointer run_data)
{
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpExportReturn export = GIMP_EXPORT_IGNORE;
GList *drawables;
GError *error = NULL;
gegl_init (NULL, NULL);
export = gimp_export_options_get_image (options, &image);
drawables = gimp_image_list_layers (image);
if (! export_image (file, image, drawables->data, &error))
status = GIMP_PDB_EXECUTION_ERROR;
if (export == GIMP_EXPORT_EXPORT)
gimp_image_delete (image);
g_list_free (drawables);
return gimp_procedure_new_return_values (procedure, status, error);
}
static GimpImage *
load_image (GFile *file,
GObject *config,
GimpRunMode run_mode,
GError **error)
{
GimpImage *image = NULL;
GimpLayer *layer;
GeglBuffer *buffer;
guint16 *pixels;
guchar magic_number[8];
guint32 width;
guint32 height;
guint32 row_size;
const Babl *format = babl_format ("R'G'B'A u16");
FILE *fp;
fp = g_fopen (g_file_peek_path (file), "rb");
if (! fp)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for reading: %s"),
gimp_file_get_utf8_name (file), g_strerror (errno));
return NULL;
}
/* Load the header */
if (! fread (magic_number, 8, 1, fp) ||
! fread (&width, sizeof (guint32), 1, fp) ||
! fread (&height, sizeof (guint32), 1, fp))
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Failed to read Farbfeld header"));
return NULL;
}
/* Header information is stored in Big-Endian format */
width = GUINT32_FROM_BE (width);
height = GUINT32_FROM_BE (height);
row_size = width * sizeof (guint16) * 4;
image = gimp_image_new_with_precision (width, height, GIMP_RGB,
GIMP_PRECISION_U16_NON_LINEAR);
layer = gimp_layer_new (image, _("Background"), width, height,
GIMP_RGBA_IMAGE, 100,
gimp_image_get_default_new_layer_mode (image));
gimp_image_insert_layer (image, layer, NULL, 0);
buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (layer));
for (gint i = 0; i < height; i++)
{
pixels = g_malloc (row_size);
if (! fread (pixels, row_size, 1, fp))
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Premature end of Farbfeld pixel data"));
return NULL;
}
/* Pixels are also stored in Big-Endian format */
for (gint j = 0; j < (width * 4); j++)
pixels[j] = GUINT16_FROM_BE (pixels[j]);
gegl_buffer_set (buffer,
GEGL_RECTANGLE (0, i, width, 1), 0,
format, pixels, GEGL_AUTO_ROWSTRIDE);
g_free (pixels);
}
fclose (fp);
g_object_unref (buffer);
return image;
}
static gboolean
export_image (GFile *file,
GimpImage *image,
GimpDrawable *drawable,
GError **error)
{
FILE *fp;
GeglBuffer *buffer;
guint16 *pixels;
const Babl *format = babl_format ("R'G'B'A u16");
gchar *magic_number;
guint32 image_width;
guint32 image_height;
guint32 export_width;
guint32 export_height;
gimp_progress_init_printf (_("Exporting '%s'"),
gimp_file_get_utf8_name (file));
fp = g_fopen (g_file_peek_path (file), "wb");
if (! fp)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for writing: %s"),
gimp_file_get_utf8_name (file), g_strerror (errno));
return FALSE;
}
buffer = gimp_drawable_get_buffer (drawable);
image_width = gegl_buffer_get_width (buffer);
image_height = gegl_buffer_get_height (buffer);
/* Farbfeld values are Big-Endian */
export_width = GUINT32_TO_BE (image_width);
export_height = GUINT32_TO_BE (image_height);
/* Write header */
magic_number = "farbfeld";
for (gint i = 0; i < 8; i++)
fputc (magic_number[i], fp);
fwrite ((gchar *) &export_width, 1, 4, fp);
fwrite ((gchar *) &export_height, 1, 4, fp);
/* Write pixel data */
for (gint i = 0; i < image_height; i++)
{
pixels = g_malloc (image_width * sizeof (guint16) * 4);
gegl_buffer_get (buffer, GEGL_RECTANGLE (0, i, image_width, 1),
1.0, format, pixels,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
for (gint j = 0; j < (image_width * 4); j++)
{
pixels[j] = GUINT16_TO_BE (pixels[j]);
fwrite ((gchar *) &pixels[j], 1, 2, fp);
}
g_free (pixels);
gimp_progress_update (i / (gdouble) image_height);
}
gimp_progress_update (1.0);
fclose (fp);
if (buffer)
g_object_unref (buffer);
return TRUE;
}
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