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gimp/plug-ins/engrave/engrave.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1997 Eiichi Takamori
* Copyright (C) 1996, 1997 Torsten Martinsen
*
* 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.
*/
/*
* This plug-in creates a black-and-white 'engraved' version of an image.
* Much of the code is stolen from the Pixelize plug-in.
*/
#include <stdio.h>
#include <stdlib.h>
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
/* Some useful macros */
#define ENTRY_WIDTH 60
#define SCALE_WIDTH 125
#define TILE_CACHE_SIZE 16
#define INTENSITY(r,g,b) (r * 0.30 + g * 0.59 + b * 0.11)
typedef struct {
gint height;
gint limit;
} EngraveValues;
typedef struct {
gint run;
} EngraveInterface;
static void query(void);
static void run(gchar * name,
gint nparams,
GParam * param,
gint * nreturn_vals,
GParam ** return_vals);
static gint engrave_dialog(void);
static void engrave_close_callback(GtkWidget * widget,
gpointer data);
static void engrave_ok_callback(GtkWidget * widget,
gpointer data);
static void engrave(GDrawable * drawable);
static void engrave_large(GDrawable * drawable, gint height, gint limit);
static void engrave_small(GDrawable * drawable, gint height, gint limit, gint tile_width);
static void engrave_sub(gint height, gint limit, gint bpp, gint color_n);
static void engrave_toggle_update (GtkWidget *widget,
gpointer data);
static void engrave_scale_update (GtkAdjustment *adjustment,
int *scale_val);
static void engrave_entry_update (GtkWidget *widget,
gint *value);
static void dialog_create_value (char *title,
GtkTable *table,
int row,
gint *value,
int left,
int right);
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static EngraveValues pvals =
{
10
};
static EngraveInterface pint =
{
FALSE /* run */
};
MAIN()
static void
query()
{
static GParamDef args[] =
{
{PARAM_INT32, "run_mode", "Interactive, non-interactive"},
{PARAM_IMAGE, "image", "Input image (unused)"},
{PARAM_DRAWABLE, "drawable", "Input drawable"},
{PARAM_INT32, "height", "Resolution in pixels"},
{PARAM_INT32, "limit", "If true, limit line width"}
};
static GParamDef *return_vals = NULL;
static gint nargs = sizeof(args) / sizeof(args[0]);
static gint nreturn_vals = 0;
gimp_install_procedure("plug_in_engrave",
"Engrave the contents of the specified drawable",
"Creates a black-and-white 'engraved' version of an image as seen in old illustrations",
"Spencer Kimball & Peter Mattis, Eiichi Takamori, Torsten Martinsen",
"Spencer Kimball & Peter Mattis, Eiichi Takamori, Torsten Martinsen",
"1995,1996,1997",
"<Image>/Filters/Distorts/Engrave",
"RGBA, GRAYA",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
static void
run(gchar * name,
gint nparams,
GParam * param,
gint * nreturn_vals,
GParam ** return_vals)
{
static GParam values[1];
GDrawable *drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
drawable = gimp_drawable_get(param[2].data.d_drawable);
switch (run_mode) {
case RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data("plug_in_engrave", &pvals);
/* First acquire information with a dialog */
if (!engrave_dialog()) {
gimp_drawable_detach(drawable);
return;
}
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS) {
pvals.height = param[3].data.d_int32;
pvals.limit = (param[4].data.d_int32) ? TRUE : FALSE;
}
if ((status == STATUS_SUCCESS) &&
pvals.height < 0)
status = STATUS_CALLING_ERROR;
break;
case RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data("plug_in_engrave", &pvals);
break;
default:
break;
}
if (status == STATUS_SUCCESS) {
gimp_progress_init("Engraving...");
gimp_tile_cache_ntiles(TILE_CACHE_SIZE);
engrave(drawable);
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush();
/* Store data */
if (run_mode == RUN_INTERACTIVE)
gimp_set_data("plug_in_engrave", &pvals, sizeof(EngraveValues));
}
values[0].data.d_status = status;
gimp_drawable_detach(drawable);
}
static gint
engrave_dialog()
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *button;
GtkWidget *toggle;
gchar **argv;
gint argc;
argc = 1;
argv = g_new(gchar *, 1);
argv[0] = g_strdup("engrave");
gtk_init(&argc, &argv);
gtk_rc_parse(gimp_gtkrc());
dlg = gtk_dialog_new();
gtk_window_set_title(GTK_WINDOW(dlg), "Engrave");
gtk_window_position(GTK_WINDOW(dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect(GTK_OBJECT(dlg), "destroy",
(GtkSignalFunc) engrave_close_callback,
NULL);
/* Action area */
button = gtk_button_new_with_label("OK");
GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
gtk_signal_connect(GTK_OBJECT(button), "clicked",
(GtkSignalFunc) engrave_ok_callback,
dlg);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->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(dlg));
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->action_area), button, TRUE, TRUE, 0);
gtk_widget_show(button);
/* parameter settings */
frame = gtk_frame_new("Parameter Settings");
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
gtk_container_border_width(GTK_CONTAINER(frame), 10);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), frame, TRUE, TRUE, 0);
table = gtk_table_new(2, 3, FALSE);
gtk_container_border_width(GTK_CONTAINER(table), 10);
gtk_container_add(GTK_CONTAINER(frame), table);
toggle = gtk_check_button_new_with_label ("Limit line width");
gtk_table_attach (GTK_TABLE (table), toggle, 0, 2, 0, 1, GTK_FILL, 0, 0, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) engrave_toggle_update,
&pvals.limit);
gtk_toggle_button_set_state (GTK_TOGGLE_BUTTON (toggle), pvals.limit);
gtk_widget_show (toggle);
dialog_create_value("Height", GTK_TABLE(table), 1, &pvals.height, 2.0, 16.0);
gtk_widget_show(frame);
gtk_widget_show(table);
gtk_widget_show(dlg);
gtk_main();
gdk_flush();
return pint.run;
}
/* Engrave interface functions */
static void
engrave_close_callback(GtkWidget * widget,
gpointer data)
{
gtk_main_quit();
}
static void
engrave_ok_callback(GtkWidget * widget,
gpointer data)
{
pint.run = TRUE;
gtk_widget_destroy(GTK_WIDGET(data));
}
static void
engrave(GDrawable * drawable)
{
gint tile_width;
gint height;
gint limit;
tile_width = gimp_tile_width();
height = (gint) pvals.height;
limit = (gint) pvals.limit;
if (height >= tile_width)
engrave_large(drawable, height, limit);
else
engrave_small(drawable, height, limit, tile_width);
}
static void
engrave_large(GDrawable * drawable, gint height, gint limit)
{
GPixelRgn src_rgn, dest_rgn;
guchar *src_row, *dest_row;
guchar *src, *dest;
gulong *average;
gint row, col, b, bpp;
gint x, y, y_step, inten, v;
gulong count;
gint x1, y1, x2, y2;
gint progress, max_progress;
gpointer pr;
gimp_drawable_mask_bounds(drawable->id, &x1, &y1, &x2, &y2);
if (gimp_drawable_color(drawable->id))
bpp = 3;
else
bpp = 1;
average = g_new(gulong, bpp);
/* Initialize progress */
progress = 0;
max_progress = 2 * (x2 - x1) * (y2 - y1);
for (y = y1; y < y2; y += height - (y % height)) {
for (x = x1; x < x2; ++x) {
y_step = height - (y % height);
y_step = MIN(y_step, x2 - x);
gimp_pixel_rgn_init(&src_rgn, drawable, x, y, 1, y_step, FALSE, FALSE);
for (b = 0; b < bpp; b++)
average[b] = 0;
count = 0;
for (pr = gimp_pixel_rgns_register(1, &src_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process(pr)) {
src_row = src_rgn.data;
for (row = 0; row < src_rgn.h; row++) {
src = src_row;
for (col = 0; col < src_rgn.w; col++) {
for (b = 0; b < bpp; b++)
average[b] += src[b];
src += src_rgn.bpp;
count += 1;
}
src_row += src_rgn.rowstride;
}
/* Update progress */
progress += src_rgn.w * src_rgn.h;
gimp_progress_update((double) progress / (double) max_progress);
}
if (count > 0)
for (b = 0; b < bpp; b++)
average[b] = (guchar) (average[b] / count);
if (bpp < 3)
inten = average[0]/254.0*height;
else
inten = INTENSITY(average[0],
average[1],
average[2])/254.0*height;
gimp_pixel_rgn_init(&dest_rgn, drawable, x, y, 1, y_step, TRUE, TRUE);
for (pr = gimp_pixel_rgns_register(1, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process(pr)) {
dest_row = dest_rgn.data;
for (row = 0; row < dest_rgn.h; row++) {
dest = dest_row;
v = inten > row ? 255 : 0;
if (limit) {
if (row == 0)
v = 255;
else if (row == height-1)
v = 0;
}
for (b = 0; b < bpp; b++)
dest[b] = v;
dest_row += dest_rgn.rowstride;
}
/* Update progress */
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update((double) progress / (double) max_progress);
}
}
}
g_free(average);
/* update the engraved region */
gimp_drawable_flush(drawable);
gimp_drawable_merge_shadow(drawable->id, TRUE);
gimp_drawable_update(drawable->id, x1, y1, (x2 - x1), (y2 - y1));
}
typedef struct {
gint x, y, h;
gint width;
guchar *data;
} PixelArea;
PixelArea area;
static void
engrave_small(GDrawable * drawable, gint height, gint limit, gint tile_width)
{
GPixelRgn src_rgn, dest_rgn;
gint bpp, color_n;
gint x1, y1, x2, y2;
gint progress, max_progress;
/*
For speed efficiency, operates on PixelAreas, whose each width and
height are less than tile size.
If both ends of area cannot be divided by height ( as
x1%height != 0 etc.), operates on the remainder pixels.
*/
gimp_drawable_mask_bounds(drawable->id, &x1, &y1, &x2, &y2);
gimp_pixel_rgn_init(&src_rgn, drawable, x1, y1, x2 - x1, y2 - y1, FALSE, FALSE);
gimp_pixel_rgn_init(&dest_rgn, drawable, x1, y1, x2 - x1, y2 - y1, TRUE, TRUE);
/* Initialize progress */
progress = 0;
max_progress = (x2 - x1) * (y2 - y1);
bpp = drawable->bpp;
if (gimp_drawable_color(drawable->id))
color_n = 3;
else
color_n = 1;
area.width = (tile_width / height) * height;
area.data = g_new(guchar, (glong) bpp * area.width * area.width);
for (area.y = y1; area.y < y2;
area.y += area.width - (area.y % area.width)) {
area.h = area.width - (area.y % area.width);
area.h = MIN(area.h, y2 - area.y);
for (area.x = x1; area.x < x2; ++area.x) {
gimp_pixel_rgn_get_rect(&src_rgn, area.data, area.x, area.y, 1, area.h);
engrave_sub(height, limit, bpp, color_n);
gimp_pixel_rgn_set_rect(&dest_rgn, area.data, area.x, area.y, 1, area.h);
/* Update progress */
progress += area.h;
gimp_progress_update((double) progress / (double) max_progress);
}
}
g_free(area.data);
/* update the engraved region */
gimp_drawable_flush(drawable);
gimp_drawable_merge_shadow(drawable->id, TRUE);
gimp_drawable_update(drawable->id, x1, y1, (x2 - x1), (y2 - y1));
}
static void
engrave_sub(gint height, gint limit, gint bpp, gint color_n)
{
glong average[3]; /* color_n <= 3 */
gint y, h, inten, v;
guchar *buf_row, *buf;
gint row;
gint rowstride;
gint count;
gint i;
/*
Since there's so many nested FOR's,
put a few of them here...
*/
rowstride = bpp;
for (y = area.y; y < area.y + area.h; y += height - (y % height)) {
h = height - (y % height);
h = MIN(h, area.y + area.h - y);
for (i = 0; i < color_n; i++)
average[i] = 0;
count = 0;
/* Read */
buf_row = area.data + (y - area.y) * rowstride;
for (row = 0; row < h; row++) {
buf = buf_row;
for (i = 0; i < color_n; i++)
average[i] += buf[i];
count++;
buf_row += rowstride;
}
/* Average */
if (count > 0)
for (i = 0; i < color_n; i++)
average[i] /= count;
if (bpp < 3)
inten = average[0]/254.0*height;
else
inten = INTENSITY(average[0],
average[1],
average[2])/254.0*height;
/* Write */
buf_row = area.data + (y - area.y) * rowstride;
for (row = 0; row < h; row++) {
buf = buf_row;
v = inten > row ? 255 : 0;
if (limit) {
if (row == 0)
v = 255;
else if (row == height-1)
v = 0;
}
for (i = 0; i < color_n; i++)
buf[i] = v;
buf_row += rowstride;
}
}
}
static void
engrave_toggle_update (GtkWidget *widget,
gpointer data)
{
int *toggle_val;
toggle_val = (int *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
*toggle_val = TRUE;
else
*toggle_val = FALSE;
}
/*
* Thanks to Quartic for these.
*/
static void
dialog_create_value(char *title, GtkTable *table, int row, gint *value, int left, int right)
{
GtkWidget *label;
GtkWidget *scale;
GtkWidget *entry;
GtkObject *scale_data;
char buf[256];
label = gtk_label_new(title);
gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
gtk_table_attach(table, label, 0, 1, row, row + 1, GTK_FILL, GTK_FILL, 4, 0);
gtk_widget_show(label);
scale_data = gtk_adjustment_new(*value, left, right,
1.0,
1.0,
0.0);
gtk_signal_connect(GTK_OBJECT(scale_data), "value_changed",
(GtkSignalFunc) engrave_scale_update,
value);
scale = gtk_hscale_new(GTK_ADJUSTMENT(scale_data));
gtk_widget_set_usize(scale, SCALE_WIDTH, 0);
gtk_table_attach(table, scale, 1, 2, row, row + 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
gtk_scale_set_draw_value(GTK_SCALE(scale), FALSE);
gtk_scale_set_digits(GTK_SCALE(scale), 0);
gtk_range_set_update_policy(GTK_RANGE(scale), GTK_UPDATE_CONTINUOUS);
gtk_widget_show(scale);
entry = gtk_entry_new();
gtk_object_set_user_data(GTK_OBJECT(entry), scale_data);
gtk_object_set_user_data(scale_data, entry);
gtk_widget_set_usize(entry, ENTRY_WIDTH, 0);
sprintf(buf, "%d", *value);
gtk_entry_set_text(GTK_ENTRY(entry), buf);
gtk_signal_connect(GTK_OBJECT(entry), "changed",
(GtkSignalFunc) engrave_entry_update,
value);
gtk_table_attach(GTK_TABLE(table), entry, 2, 3, row, row + 1, GTK_FILL, GTK_FILL, 4, 0);
gtk_widget_show(entry);
}
static void
engrave_entry_update(GtkWidget *widget, gint *value)
{
GtkAdjustment *adjustment;
gint new_value;
new_value = atoi(gtk_entry_get_text(GTK_ENTRY(widget)));
if (*value != new_value) {
adjustment = gtk_object_get_user_data(GTK_OBJECT(widget));
if ((new_value >= adjustment->lower) &&
(new_value <= adjustment->upper)) {
*value = new_value;
adjustment->value = new_value;
gtk_signal_emit_by_name(GTK_OBJECT(adjustment), "value_changed");
} /* if */
} /* if */
}
static void
engrave_scale_update (GtkAdjustment *adjustment, gint *value)
{
GtkWidget *entry;
char buf[256];
if (*value != adjustment->value) {
*value = adjustment->value;
entry = gtk_object_get_user_data(GTK_OBJECT(adjustment));
sprintf(buf, "%d", *value);
gtk_signal_handler_block_by_data(GTK_OBJECT(entry), value);
gtk_entry_set_text(GTK_ENTRY(entry), buf);
gtk_signal_handler_unblock_by_data(GTK_OBJECT(entry), value);
} /* if */
}
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