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gimp/plug-ins/exchange/exchange.c

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/*
* This is a plug-in for the GIMP.
*
* 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.
*
*
*/
/*
* Exchange one color with the other (settable threshold to convert from
* one color-shade to another...might do wonders on certain images, or be
* totally useless on others).
*
* Author: robert@experimental.net
*
* TODO:
* - preview (working on it already :)
* - threshold for each channel (not hard to implement, but really
* needs a preview window)
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "libgimp/gimp.h"
#include "gtk/gtk.h"
/* big scales */
#define SCALE_WIDTH 225
/* datastructure to store parameters in */
typedef struct
{
guchar fromred, fromgreen, fromblue, tored, togreen, toblue;
guchar threshold;
gint32 image;
gint32 drawable;
} myParams;
/* lets prototype */
static void query();
static void run(char *, int, GParam *, int *, GParam **);
static int doDialog();
static void exchange(GDrawable *);
static void doLabelAndScale(char *, GtkWidget *, guchar *);
static void ok_callback(GtkWidget *, gpointer);
static void scale_callback(GtkAdjustment *, gpointer);
/* some global variables */
myParams xargs = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
int running = 0;
/* lets declare what we want to do */
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
/* run program */
MAIN()
/* tell GIMP who we are */
static
void query()
{
static GParamDef args[] =
{
{ PARAM_INT32, "run_mode", "Interactive" },
{ PARAM_IMAGE, "image", "Input image" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_INT8, "fromred", "Red value (from)" },
{ PARAM_INT8, "fromgreen", "Green value (from)" },
{ PARAM_INT8, "fromblue", "Blue value (from)" },
{ PARAM_INT8, "tored", "Red value (to)" },
{ PARAM_INT8, "togreen", "Green value (to)" },
{ PARAM_INT8, "toblue", "Blue value (to)" },
{ PARAM_INT8, "threshold", "Threshold" },
};
static GParamDef *return_vals = NULL;
static int nargs = sizeof(args) / sizeof(args[0]);
static int nreturn_vals = 0;
gimp_install_procedure("plug_in_exchange",
"Color exchange",
"Exchange one color with another, optionally setting a threshold to convert from one shade to another",
"robert@experimental.net",
"robert@experimental.net",
"June 17th, 1997",
"<Image>/Filters/Colors/Color Exchange",
"RGB*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
/* main function */
static
void run(char *name, int nparams, GParam *param, int *nreturn_vals, GParam **return_vals)
{
static GParam values[1];
GRunModeType runmode;
GDrawable *drawable;
gint32 imageID;
GStatusType status = STATUS_SUCCESS;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
switch (runmode = param[0].data.d_int32)
{
case RUN_INTERACTIVE:
/* retrieve stored arguments (if any) */
gimp_get_data("plug_in_exchange", &xargs);
/* initialize using foreground color */
gimp_palette_get_foreground(&xargs.fromred, &xargs.fromgreen, &xargs.fromblue);
if (!xargs.image && !xargs.drawable)
xargs.threshold = 0;
/* and initialize some other things */
xargs.image = param[1].data.d_image;
xargs.drawable = param[2].data.d_drawable;
if (!doDialog())
return;
break;
case RUN_WITH_LAST_VALS:
/*
* instead of recalling the last-set values,
* run with the current foreground as 'from'
* color, making ALT-F somewhat more useful.
*/
gimp_palette_get_foreground(&xargs.fromred, &xargs.fromgreen, &xargs.fromblue);
break;
case RUN_NONINTERACTIVE:
if(nparams != 10)
status = STATUS_EXECUTION_ERROR;
if (status == STATUS_SUCCESS)
{
xargs.fromred = param[3].data.d_int8;
xargs.fromgreen = param[4].data.d_int8;
xargs.fromblue = param[5].data.d_int8;
xargs.tored = param[6].data.d_int8;
xargs.togreen = param[7].data.d_int8;
xargs.toblue = param[8].data.d_int8;
xargs.threshold = param[9].data.d_int32;
}
break;
default:
break;
}
/* Get the specified drawable */
drawable = gimp_drawable_get(param[2].data.d_drawable);
imageID = param[1].data.d_image;
if (status == STATUS_SUCCESS)
{
if (gimp_drawable_color(drawable->id))
{
gimp_progress_init("Color exchange...");
gimp_tile_cache_ntiles(2 * (drawable->width / gimp_tile_width() + 1));
exchange(drawable);
/* store our settings */
gimp_set_data("plug_in_exchange", &xargs, sizeof(myParams));
/* and flush */
gimp_displays_flush();
}
else
status = STATUS_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach(drawable);
}
/* do the exchanging */
static
void exchange(GDrawable *drawable)
{
GPixelRgn srcPR, destPR;
guchar *src_row;
guchar *dest_row;
gint width, height;
gint x, y, bpp;
gint x1, y1, x2, y2;
/*
* Get the input area. This is the bounding box of the selection in
* the image (or the entire image if there is no selection). Only
* operating on the input area is simply an optimization. It doesn't
* need to be done for correct operation. (It simply makes it go
* faster, since fewer pixels need to be operated on).
*/
gimp_drawable_mask_bounds(drawable->id, &x1, &y1, &x2, &y2);
/*
* 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;
bpp = drawable->bpp;
/* allocate row buffers */
src_row = (guchar *) malloc((x2 - x1) * bpp);
dest_row = (guchar *) malloc((x2 - x1) * bpp);
/* 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);
for (y = y1; y < y2; y++)
{
gimp_pixel_rgn_get_row(&srcPR, src_row, x1, y, (x2 - x1));
for (x = x1; x < x2; x++)
{
guchar red, green, blue,
minred, mingreen, minblue,
maxred, maxgreen, maxblue;
int rest, wanted = 0,
redx = 0, greenx = 0, bluex = 0;
/* get boundary values */
minred = MAX((int) xargs.fromred - xargs.threshold, 0);
mingreen = MAX((int) xargs.fromgreen - xargs.threshold, 0);
minblue = MAX((int) xargs.fromblue - xargs.threshold, 0);
maxred = MIN((int) xargs.fromred + xargs.threshold, 255);
maxgreen = MIN((int) xargs.fromgreen + xargs.threshold, 255);
maxblue = MIN((int) xargs.fromblue + xargs.threshold, 255);
/* get current pixel values */
red = src_row[x * bpp];
green = src_row[x * bpp + 1];
blue = src_row[x * bpp + 2];
/*
* check if we want this pixel (does it fall between
* our boundary?)
*/
if (red >= minred && red <= maxred &&
green >= mingreen && green <= maxgreen &&
blue >= minblue && blue <= maxblue)
{
redx = red - xargs.fromred;
greenx = green - xargs.fromgreen;
bluex = blue - xargs.fromblue;
wanted = 1;
}
/* exchange if needed */
dest_row[x * bpp] = wanted ? MAX(MIN(xargs.tored + redx, 255), 0) : src_row[x * bpp];
dest_row[x * bpp + 1] = wanted ? MAX(MIN(xargs.togreen + greenx, 255), 0) : src_row[x * bpp + 1];
dest_row[x * bpp + 2] = wanted ? MAX(MIN(xargs.toblue + bluex, 255), 0) : src_row[x * bpp + 2];
/* copy rest (most likely alpha-channel) */
for (rest = 3; rest < bpp; rest++)
dest_row[x * bpp + rest] = src_row[x * bpp + rest];
}
/* store the dest */
gimp_pixel_rgn_set_row(&destPR, dest_row, x1, y, (x2 - x1));
/* and tell the user what we're doing */
if ((y % 10) == 0)
gimp_progress_update((double) y / (double) (y2 - y1));
}
/* update the processed region */
gimp_drawable_flush(drawable);
gimp_drawable_merge_shadow(drawable->id, TRUE);
gimp_drawable_update(drawable->id, x1, y1, (x2 - x1), (y2 - y1));
/* and clean up */
free(src_row);
free(dest_row);
}
/* show our dialog */
static
int doDialog()
{
GtkWidget *dialog;
GtkWidget *button;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *mainbox;
GtkWidget *tobox;
GtkWidget *frombox;
gchar **argv;
gint argc;
int framenumber;
argc = 1;
argv = g_new(gchar *, 1);
argv[0] = g_strdup("exchange");
gtk_init(&argc, &argv);
gtk_rc_parse(gimp_gtkrc());
/* set up the dialog */
dialog = gtk_dialog_new();
gtk_window_set_title(GTK_WINDOW(dialog), "Color Exchange");
gtk_window_position(GTK_WINDOW(dialog), GTK_WIN_POS_MOUSE);
gtk_signal_connect(GTK_OBJECT(dialog), "destroy",
(GtkSignalFunc) gtk_main_quit,
NULL);
/* lets create some buttons */
button = gtk_button_new_with_label("Ok");
GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
gtk_signal_connect(GTK_OBJECT(button), "clicked",
(GtkSignalFunc) ok_callback,
dialog);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->action_area),
button, TRUE, TRUE, 0);
gtk_widget_grab_default(button);
gtk_widget_show(button);
button = gtk_button_new_with_label("Cancel");
GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
gtk_signal_connect_object (GTK_OBJECT(button), "clicked",
(GtkSignalFunc) gtk_widget_destroy,
GTK_OBJECT(dialog));
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->action_area),
button, TRUE, TRUE, 0);
gtk_widget_show(button);
/* do some boxes here */
mainbox = gtk_vbox_new(FALSE, 5);
gtk_container_border_width(GTK_CONTAINER(mainbox), 10);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), mainbox, TRUE, TRUE, 0);
frombox = gtk_hbox_new(FALSE, 5);
gtk_container_border_width(GTK_CONTAINER(frombox), 10);
gtk_box_pack_start(GTK_BOX(mainbox), frombox, TRUE, TRUE, 0);
tobox = gtk_hbox_new(FALSE, 5);
gtk_container_border_width(GTK_CONTAINER(tobox), 10);
gtk_box_pack_start(GTK_BOX(mainbox), tobox, TRUE, TRUE, 0);
/* and our scales */
for (framenumber = 0; framenumber < 2; framenumber++)
{
frame = gtk_frame_new(framenumber ? "To color" : "From color");
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
gtk_container_border_width(GTK_CONTAINER(frame), 10);
gtk_box_pack_start(framenumber ? GTK_BOX(tobox) : GTK_BOX(frombox),
frame, TRUE, TRUE, 0);
gtk_widget_show(frame);
table = gtk_table_new(8, 2, FALSE);
gtk_container_border_width(GTK_CONTAINER(table), 10);
gtk_container_add(GTK_CONTAINER(frame), table);
doLabelAndScale("Red", table, framenumber ? &xargs.tored : &xargs.fromred);
doLabelAndScale("Green", table, framenumber ? &xargs.togreen : &xargs.fromgreen);
doLabelAndScale("Blue", table, framenumber ? &xargs.toblue : &xargs.fromblue);
if (!framenumber)
doLabelAndScale("Threshold", table, &xargs.threshold);
gtk_widget_show(table);
}
/* show everything */
gtk_widget_show(tobox);
gtk_widget_show(frombox);
gtk_widget_show(mainbox);
gtk_widget_show(dialog);
gtk_main();
gdk_flush();
return running;
}
static
void doLabelAndScale(char *labelname, GtkWidget *table, guchar *dest)
{
static int idx = -1;
GtkWidget *label, *scale;
GtkObject *scale_data;
idx++;
label = gtk_label_new(labelname);
gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
gtk_table_attach(GTK_TABLE(table), label, 0, 1, idx, idx + 1, GTK_FILL, 0, 5, 0);
scale_data = gtk_adjustment_new(*dest, 0.0, 255.0, 0.0, 0.0, 0.0);
scale = gtk_hscale_new(GTK_ADJUSTMENT(scale_data));
gtk_widget_set_usize(scale, SCALE_WIDTH, 0);
/* just need 1:1 resolution on scales */
gtk_scale_set_digits(GTK_SCALE(scale), 0);
gtk_table_attach(GTK_TABLE(table), scale, 1, 2, idx, idx + 1, GTK_FILL, 0, 0, 0);
gtk_scale_set_value_pos(GTK_SCALE(scale), GTK_POS_TOP);
gtk_range_set_update_policy(GTK_RANGE(scale), GTK_UPDATE_DELAYED);
gtk_signal_connect(GTK_OBJECT(scale_data), "value_changed",
(GtkSignalFunc) scale_callback,
dest);
gtk_widget_show(label);
gtk_widget_show(scale);
}
static
void ok_callback(GtkWidget *widget, gpointer data)
{
running = 1;
gtk_widget_destroy(GTK_WIDGET(data));
}
static
void scale_callback(GtkAdjustment *adj, gpointer data)
{
guchar *val = data;
*val = (guchar) adj->value;
}
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