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gimp/plug-ins/common/deinterlace.c

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/* Deinterlace 1.00 - image processing plug-in for the Gimp
*
* Copyright (C) 1997 Andrew Kieschnick (andrewk@mail.utexas.edu)
*
* Original deinterlace for the Gimp 0.54 API by Federico Mena Quintero
*
* Copyright (C) 1996 Federico Mena Quintero
*
* 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.
*/
#include "config.h"
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
enum
{
ODD_FIELDS,
EVEN_FIELDS
};
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void deinterlace (GimpDrawable *drawable);
static gboolean deinterlace_dialog (void);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static gint DeinterlaceValue = EVEN_FIELDS;
MAIN ()
static void
query (void)
{
static GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "evenodd", "0 = keep odd, 1 = keep even" }
};
gimp_install_procedure ("plug_in_deinterlace",
"Deinterlace",
"Deinterlace is useful for processing images from "
"video capture cards. When only the odd or even "
"fields get captured, deinterlace can be used to "
"interpolate between the existing fields to correct "
"this.",
"Andrew Kieschnick",
"Andrew Kieschnick",
"1997",
N_("_Deinterlace..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register ("plug_in_deinterlace",
N_("<Image>/Filters/Enhance"));
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
INIT_I18N ();
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data ("plug_in_deinterlace", &DeinterlaceValue);
if (! deinterlace_dialog ())
status = GIMP_PDB_EXECUTION_ERROR;
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparams != 4)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
DeinterlaceValue = param[3].data.d_int32;
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data ("plug_in_deinterlace", &DeinterlaceValue);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Deinterlace..."));
gimp_tile_cache_ntiles (2 * (drawable->width /
gimp_tile_width () + 1));
deinterlace (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_deinterlace",
&DeinterlaceValue, sizeof (DeinterlaceValue));
}
else
{
/* gimp_message ("deinterlace: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
}
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
deinterlace (GimpDrawable *drawable)
{
GimpPixelRgn srcPR, destPR;
gint width, height;
gint bytes;
gint has_alpha;
guchar *dest;
guchar *upper;
guchar *lower;
gint row, col;
gint x1, y1, x2, y2;
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
/* Get the size of the input image. (This will/must be the same
* as the size of the output image.
*/
width = drawable->width;
height = drawable->height;
bytes = drawable->bpp;
/* allocate row buffers */
dest = g_new (guchar, (x2 - x1) * bytes);
upper = g_new (guchar, (x2 - x1) * bytes);
lower = g_new (guchar, (x2 - x1) * bytes);
/* initialize the pixel regions */
gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable, 0, 0, width, height, TRUE, TRUE);
/* loop through the rows, performing our magic*/
for (row = y1; row < y2; row++)
{
gimp_pixel_rgn_get_row (&srcPR, dest, x1, row, x2 - x1);
/* Only do interpolation if the row:
(1) Isn't one we want to keep
(2) Has both an upper and a lower row
Otherwise, just duplicate the source row
*/
if (!((row % 2 == DeinterlaceValue) ||
(row - 1 < 0) ||
(row + 1 >= height)))
{
gimp_pixel_rgn_get_row (&srcPR, upper, x1, row - 1, x2 - x1);
gimp_pixel_rgn_get_row (&srcPR, lower, x1, row + 1, x2 - x1);
if (has_alpha)
{
guchar *upix = upper;
guchar *lpix = lower;
guchar *dpix = dest;
for (col = 0; col < x2-x1; col++)
{
gint b;
guint ualpha = upix[bytes-1];
guint lalpha = lpix[bytes-1];
guint alpha = ualpha + lalpha;
if ((dpix[bytes-1] = (alpha >> 1)))
{
for (b = 0; b < bytes-1; b++)
dpix[b] = (upix[b] * ualpha + lpix[b] * lalpha) / alpha;
}
upix += bytes;
lpix += bytes;
dpix += bytes;
}
}
else
{
for (col = 0; col < (x2 - x1) * bytes; col++)
dest[col] = (upper[col] + lower[col]) / 2;
}
}
gimp_pixel_rgn_set_row (&destPR, dest, x1, row, x2 - x1);
if ((row % 5) == 0)
gimp_progress_update ((double) row / (double) (y2 - y1));
}
/* update the deinterlaced region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, x2 - x1, y2 - y1);
g_free (lower);
g_free (upper);
g_free (dest);
}
static gboolean
deinterlace_dialog (void)
{
GtkWidget *dlg;
GtkWidget *frame;
gboolean run;
gimp_ui_init ("deinterlace", FALSE);
dlg = gimp_dialog_new (_("Deinterlace"), "deinterlace",
NULL, 0,
gimp_standard_help_func, "plug-in-deinterlace",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
frame = gimp_int_radio_group_new (FALSE, NULL,
G_CALLBACK (gimp_radio_button_update),
&DeinterlaceValue, DeinterlaceValue,
_("Keep o_dd fields"), ODD_FIELDS, NULL,
_("Keep _even fields"), EVEN_FIELDS, NULL,
NULL);
gtk_container_set_border_width (GTK_CONTAINER (frame), 12);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
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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