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gimp/plug-ins/common/max_rgb.c

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/* max_rgb.c -- This is a plug-in for the GIMP
* Author: Shuji Narazaki <narazaki@InetQ.or.jp>
* Time-stamp: <2000-02-08 16:26:24 yasuhiro>
* Version: 0.35
*
* Copyright (C) 1997 Shuji Narazaki <narazaki@InetQ.or.jp>
*
* May 2000 - tim copperfield [timecop@japan.co.jp]
*
* Added a preview mode. After adding preview mode realised just exactly
* how useless this plugin is :)
*
* 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 <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_NAME "plug_in_max_rgb"
#define SHORT_NAME "max_rgb"
#define HELP_ID "plug-in-max-rgb"
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static GimpPDBStatusType main_function (GimpDrawable *drawable,
GimpPreview *preview);
static gint max_rgb_dialog (GimpDrawable *drawable);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
enum
{
MIN_CHANNELS = 0,
MAX_CHANNELS = 1
};
typedef struct
{
gint max_p;
gboolean preview;
} ValueType;
static ValueType pvals =
{
MAX_CHANNELS,
TRUE
};
MAIN ()
static void
query (void)
{
static GimpParamDef args [] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (not used)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "max_p", "1 for maximizing, 0 for minimizing" }
};
gimp_install_procedure (PLUG_IN_NAME,
"Return an image in which each pixel holds only "
"the channel that has the maximum value in three "
"(red, green, blue) channels, and other channels "
"are zero-cleared",
"the help is not yet written for this plug-in since none is needed.",
"Shuji Narazaki (narazaki@InetQ.or.jp)",
"Shuji Narazaki",
"May 2000",
N_("_Max RGB..."),
"RGB*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_NAME, "<Image>/Filters/Colors");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
GimpDrawable *drawable;
static GimpParam values[1];
GimpPDBStatusType status = GIMP_PDB_EXECUTION_ERROR;
GimpRunMode run_mode;
run_mode = param[0].data.d_int32;
drawable = gimp_drawable_get (param[2].data.d_drawable);
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data (PLUG_IN_NAME, &pvals);
/* Since a channel might be selected, we must check wheter RGB or not. */
if (!gimp_drawable_is_rgb (drawable->drawable_id))
{
g_message (_("Can only operate on RGB drawables."));
return;
}
if (! max_rgb_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* You must copy the values of parameters to pvals or dialog variables. */
pvals.max_p = param[3].data.d_int32;
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_NAME, &pvals);
break;
}
status = main_function (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE && status == GIMP_PDB_SUCCESS)
gimp_set_data (PLUG_IN_NAME, &pvals, sizeof (ValueType));
values[0].data.d_status = status;
}
typedef struct {
gint init_value;
gint flag;
gboolean has_alpha;
} MaxRgbParam_t;
static void
max_rgb_func (const guchar *src,
guchar *dest,
gint bpp,
gpointer data)
{
MaxRgbParam_t *param = (MaxRgbParam_t*) data;
gint ch, max_ch = 0;
guchar max, tmp_value;
max = param->init_value;
for (ch = 0; ch < 3; ch++)
if (param->flag * max <= param->flag * (tmp_value = (*src++)))
{
if (max == tmp_value)
{
max_ch += 1 << ch;
}
else
{
max_ch = 1 << ch; /* clear memories of old channels */
max = tmp_value;
}
}
dest[0] = (max_ch & (1 << 0)) ? max : 0;
dest[1] = (max_ch & (1 << 1)) ? max : 0;
dest[2] = (max_ch & (1 << 2)) ? max : 0;
if (param->has_alpha)
dest[3] = *src;
}
static GimpPDBStatusType
main_function (GimpDrawable *drawable,
GimpPreview *preview)
{
MaxRgbParam_t param;
param.init_value = (pvals.max_p > 0) ? 0 : 255;
param.flag = (0 < pvals.max_p) ? 1 : -1;
param.has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
if (preview)
{
gint i;
guchar *buffer;
guchar *src;
gint width, height, bpp;
gimp_preview_get_size (preview, &width, &height);
src = gimp_drawable_get_thumbnail_data (drawable->drawable_id,
&width, &height, &bpp);
buffer = g_new (guchar, width * height * bpp);
for (i = 0; i < width * height; i++)
{
max_rgb_func (src + i * bpp,
buffer + i * bpp,
bpp,
&param);
}
gimp_preview_draw_buffer (preview, buffer, width * bpp);
g_free (buffer);
g_free (src);
}
else
{
gimp_progress_init ( _("Max RGB..."));
gimp_rgn_iterate2 (drawable, 0 /* unused */, max_rgb_func, &param);
gimp_drawable_detach (drawable);
}
return GIMP_PDB_SUCCESS;
}
/* dialog stuff */
static gint
max_rgb_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *frame;
GtkWidget *max;
GtkWidget *min;
gboolean run;
gimp_ui_init ("max_rgb", TRUE);
dialog = gimp_dialog_new (_("Max RGB"), "max_rgb",
NULL, 0,
gimp_standard_help_func, "plug-in-max-rgb",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_aspect_preview_new (drawable, &pvals.preview);
gtk_box_pack_start_defaults (GTK_BOX (main_vbox), preview);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (main_function),
drawable);
frame = gimp_int_radio_group_new (FALSE, NULL,
G_CALLBACK (gimp_radio_button_update),
&pvals.max_p, pvals.max_p,
_("_Hold the maximal channels"),
MAX_CHANNELS, &max,
_("Ho_ld the minimal channels"),
MIN_CHANNELS, &min,
NULL);
g_signal_connect_swapped (max, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (min, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
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