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gimp/plug-ins/polar/polar.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Polarize plug-in --- maps a rectangul to a circle or vice-versa
* Copyright (C) 1997 Daniel Dunbar
* Email: ddunbar@diads.com
* WWW: http://millennium.diads.com/gimp/
* Copyright (C) 1997 Federico Mena Quintero
* federico@nuclecu.unam.mx
* Copyright (C) 1996 Marc Bless
* E-mail: bless@ai-lab.fh-furtwangen.de
* WWW: www.ai-lab.fh-furtwangen.de/~bless
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Version 1.0:
* This is the follow-up release. It contains a few minor changes, the
* most major being that the first time I released the wrong version of
* the code, and this time the changes have been fixed. I also added
* tooltips to the dialog.
*
* Feel free to email me if you have any comments or suggestions on this
* plugin.
* --Daniel Dunbar
* ddunbar@diads.com
*/
/* Version .5:
* This is the first version publicly released, it will probably be the
* last also unless i can think of some features i want to add.
*
* This plug-in was created with loads of help from quartic (Frederico
* Mena Quintero), and would surely not have come about without it.
*
* The polar algorithms is copied from Marc Bless' polar plug-in for
* .54, many thanks to him also.
*
* If you can think of a neat addition to this plug-in, or any other
* info about it, please email me at ddunbar@diads.com.
* - Daniel Dunbar
*/
#include <math.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
#define sqr(x) ((x) * (x))
#define WITHIN(a, b, c) ((((a) <= (b)) && ((b) <= (c))) ? 1 : 0)
/***** Magic numbers *****/
#define PLUG_IN_NAME "plug_in_polar_coords"
#define PLUG_IN_VERSION "July 1997, 0.5"
#define PREVIEW_SIZE 128
#define SCALE_WIDTH 200
#define ENTRY_WIDTH 60
#define CHECK_SIZE 8
#define CHECK_DARK ((int) (1.0 / 3.0 * 255))
#define CHECK_LIGHT ((int) (2.0 / 3.0 * 255))
/***** Types *****/
typedef struct {
gdouble circle;
gdouble angle;
gint backwards;
gint inverse;
gint polrec;
} polarize_vals_t;
typedef struct {
GtkWidget *preview;
guchar *check_row_0;
guchar *check_row_1;
guchar *image;
guchar *dimage;
gint run;
} polarize_interface_t;
typedef struct {
gint col, row;
gint img_width, img_height, img_bpp, img_has_alpha;
gint tile_width, tile_height;
guchar bg_color[4];
GDrawable *drawable;
GTile *tile;
} pixel_fetcher_t;
/***** Prototypes *****/
static void query(void);
static void run(char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals);
static void polarize(void);
static int calc_undistorted_coords(double wx, double wy,
double *x, double *y);
static guchar bilinear(double x, double y, guchar *values);
static pixel_fetcher_t *pixel_fetcher_new(GDrawable *drawable);
static void pixel_fetcher_set_bg_color(pixel_fetcher_t *pf, guchar r, guchar g, guchar b, guchar a);
static void pixel_fetcher_get_pixel(pixel_fetcher_t *pf, int x, int y, guchar *pixel);
static void pixel_fetcher_destroy(pixel_fetcher_t *pf);
static void build_preview_source_image(void);
static gint polarize_dialog(void);
static void dialog_update_preview(void);
static void dialog_create_value(char *title, GtkTable *table, int row, gdouble *value,
double left, double right, double step);
static void dialog_scale_update(GtkAdjustment *adjustment, gdouble *value);
static void dialog_entry_update(GtkWidget *widget, gdouble *value);
static void dialog_close_callback(GtkWidget *widget, gpointer data);
static void dialog_ok_callback(GtkWidget *widget, gpointer data);
static void dialog_cancel_callback(GtkWidget *widget, gpointer data);
static void polar_toggle_callback(GtkWidget *widget, gpointer data);
static void set_tooltip (GtkTooltips *tooltips, GtkWidget *widget, const char *desc);
/***** Variables *****/
GPlugInInfo PLUG_IN_INFO = {
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run /* run_proc */
}; /* PLUG_IN_INFO */
static polarize_vals_t pcvals = {
100.0, /* circle */
0.0, /* angle */
0, /* backwards */
1, /* inverse */
1 /* polar to rectangular? */
}; /* pcvals */
static polarize_interface_t pcint = {
NULL, /* preview */
NULL, /* check_row_0 */
NULL, /* check_row_1 */
NULL, /* image */
NULL, /* dimage */
FALSE /* run */
}; /* pcint */
static GDrawable *drawable;
static gint img_width, img_height, img_bpp, img_has_alpha;
static gint sel_x1, sel_y1, sel_x2, sel_y2;
static gint sel_width, sel_height;
static gint preview_width, preview_height;
static double cen_x, cen_y;
static double scale_x, scale_y;
/***** Functions *****/
/*****/
MAIN()
/*****/
static void
query(void)
{
static GParamDef args[] = {
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_FLOAT, "circle", "Circle depth in %" },
{ PARAM_FLOAT, "angle", "Offset angle" },
{ PARAM_INT8, "backwards", "Map backwards?" },
{ PARAM_INT8, "inverse", "Map from top?" },
{ PARAM_INT8, "polrec", "Polar to rectangular?" },
}; /* args */
static GParamDef *return_vals = NULL;
static int nargs = sizeof(args) / sizeof(args[0]);
static int nreturn_vals = 0;
gimp_install_procedure(PLUG_IN_NAME,
"Converts and image to and from polar coords",
"Remaps and image from rectangular coordinates to polar coordinats or vice versa",
"Daniel Dunbar and Federico Mena Quintero",
"Daniel Dunbar and Federico Mena Quintero",
PLUG_IN_VERSION,
"<Image>/Filters/Distorts/Polar Coords",
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs,
nreturn_vals,
args,
return_vals);
} /* query */
/*****/
static void
run(char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals)
{
static GParam values[1];
GRunModeType run_mode;
GStatusType status;
double xhsiz, yhsiz;
int pwidth, pheight;
status = STATUS_SUCCESS;
run_mode = param[0].data.d_int32;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
*nreturn_vals = 1;
*return_vals = values;
/* Get the active drawable info */
drawable = gimp_drawable_get(param[2].data.d_drawable);
img_width = gimp_drawable_width(drawable->id);
img_height = gimp_drawable_height(drawable->id);
img_bpp = gimp_drawable_bpp(drawable->id);
img_has_alpha = gimp_drawable_has_alpha(drawable->id);
gimp_drawable_mask_bounds(drawable->id, &sel_x1, &sel_y1, &sel_x2, &sel_y2);
/* Calculate scaling parameters */
sel_width = sel_x2 - sel_x1;
sel_height = sel_y2 - sel_y1;
cen_x = (double) (sel_x1 + sel_x2 - 1) / 2.0;
cen_y = (double) (sel_y1 + sel_y2 - 1) / 2.0;
xhsiz = (double) (sel_width - 1) / 2.0;
yhsiz = (double) (sel_height - 1) / 2.0;
if (xhsiz < yhsiz) {
scale_x = yhsiz / xhsiz;
scale_y = 1.0;
} else if (xhsiz > yhsiz) {
scale_x = 1.0;
scale_y = xhsiz / yhsiz;
} else {
scale_x = 1.0;
scale_y = 1.0;
} /* else */
/* Calculate preview size */
if (sel_width > sel_height) {
pwidth = MIN(sel_width, PREVIEW_SIZE);
pheight = sel_height * pwidth / sel_width;
} else {
pheight = MIN(sel_height, PREVIEW_SIZE);
pwidth = sel_width * pheight / sel_height;
} /* else */
preview_width = MAX(pwidth, 2); /* Min size is 2 */
preview_height = MAX(pheight, 2);
/* See how we will run */
switch (run_mode) {
case RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data(PLUG_IN_NAME, &pcvals);
/* Get information from the dialog */
if (!polarize_dialog())
return;
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are present */
if (nparams != 8)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS) {
pcvals.circle = param[3].data.d_float;
pcvals.angle = param[4].data.d_float;
pcvals.backwards = param[5].data.d_int8;
pcvals.inverse = param[6].data.d_int8;
pcvals.polrec = param[7].data.d_int8;
} /* if */
break;
case RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data(PLUG_IN_NAME, &pcvals);
break;
default:
break;
} /* switch */
/* Distort the image */
if ((status == STATUS_SUCCESS) &&
(gimp_drawable_color(drawable->id) ||
gimp_drawable_gray(drawable->id))) {
/* Set the tile cache size */
gimp_tile_cache_ntiles(2 * (drawable->width + gimp_tile_width() - 1) / gimp_tile_width());
/* Run! */
polarize();
/* If run mode is interactive, flush displays */
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush();
/* Store data */
if (run_mode == RUN_INTERACTIVE)
gimp_set_data(PLUG_IN_NAME, &pcvals, sizeof(polarize_vals_t));
} else if (status == STATUS_SUCCESS)
status = STATUS_EXECUTION_ERROR;
values[0].data.d_status = status;
gimp_drawable_detach(drawable);
} /* run */
/*****/
static void
polarize(void) {
GPixelRgn dest_rgn;
guchar *dest, *d;
guchar pixel[4][4];
guchar pixel2[4];
guchar values[4];
gint progress, max_progress;
double cx, cy;
guchar bg_color[4];
gint x1, y1, x2, y2;
gint x, y, b;
gpointer pr;
pixel_fetcher_t *pft;
#if 0
printf("Waiting... (pid %d)\n", getpid());
kill(getpid(), SIGSTOP);
#endif
/* Get selection area */
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
/* Initialize pixel region */
gimp_pixel_rgn_init (&dest_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
pft = pixel_fetcher_new(drawable);
gimp_palette_get_background(&bg_color[0], &bg_color[1], &bg_color[2]);
pixel_fetcher_set_bg_color(pft, bg_color[0], bg_color[1], bg_color[2], (img_has_alpha ? 0 : 255));
progress = 0;
max_progress = img_width * img_height;
gimp_progress_init("Polarizing...");
for (pr = gimp_pixel_rgns_register (1, &dest_rgn); pr != NULL; pr = gimp_pixel_rgns_process (pr)) {
dest = dest_rgn.data;
for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++) {
d = dest;
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++) {
if (calc_undistorted_coords(x, y, &cx, &cy)) {
pixel_fetcher_get_pixel(pft, cx, cy, pixel[0]);
pixel_fetcher_get_pixel(pft, cx + 1, cy, pixel[1]);
pixel_fetcher_get_pixel(pft, cx, cy + 1, pixel[2]);
pixel_fetcher_get_pixel(pft, cx + 1, cy + 1, pixel[3]);
for (b = 0; b < img_bpp; b++) {
values[0] = pixel[0][b];
values[1] = pixel[1][b];
values[2] = pixel[2][b];
values[3] = pixel[3][b];
d[b] = bilinear(cx, cy, values);
}
} else {
pixel_fetcher_get_pixel(pft, x, y, pixel2);
for (b = 0; b < img_bpp; b++) {
d[b] = 255;
}
}
d += dest_rgn.bpp;
}
dest += dest_rgn.rowstride;
}
progress += dest_rgn.w *dest_rgn.h;
gimp_progress_update((double) progress / max_progress);
}
gimp_drawable_flush(drawable);
gimp_drawable_merge_shadow(drawable->id, TRUE);
gimp_drawable_update(drawable->id, x1, y1, (x2 - x1), (y2 - y1));
} /* polarize */
/*****/
static int
calc_undistorted_coords(double wx, double wy,
double *x, double *y)
{
int inside;
double phi, phi2;
double xx, xm, ym, yy;
int xdiff, ydiff;
double r;
double m;
double xmax, ymax, rmax;
double x_calc, y_calc;
double xi, yi;
double circle, angl, t, angle;
int x1, x2, y1, y2;
/* initialize */
phi = 0.0;
r = 0.0;
x1 = 0;
y1 = 0;
x2 = img_width;
y2 = img_height;
xdiff = x2 - x1;
ydiff = y2 - y1;
xm = xdiff / 2.0;
ym = ydiff / 2.0;
circle = pcvals.circle;
angle = pcvals.angle;
angl = (double)angle / 180.0 * M_PI;
if (pcvals.polrec) {
if (wx >= cen_x) {
if (wy > cen_y) {
phi = M_PI - atan (((double)(wx - cen_x))/((double)(wy - cen_y)));
r = sqrt (sqr (wx - cen_x) + sqr (wy - cen_y));
} else if (wy < cen_y) {
phi = atan (((double)(wx - cen_x))/((double)(cen_y - wy)));
r = sqrt (sqr (wx - cen_x) + sqr (cen_y - wy));
} else {
phi = M_PI / 2;
r = wx - cen_x; /* cen_x - x1; */
}
} else if (wx < cen_x) {
if (wy < cen_y) {
phi = 2 * M_PI - atan (((double)(cen_x -wx))/((double)(cen_y - wy)));
r = sqrt (sqr (cen_x - wx) + sqr (cen_y - wy));
} else if (wy > cen_y) {
phi = M_PI + atan (((double)(cen_x - wx))/((double)(wy - cen_y)));
r = sqrt (sqr (cen_x - wx) + sqr (wy - cen_y));
} else {
phi = 1.5 * M_PI;
r = cen_x - wx; /* cen_x - x1; */
}
}
if (wx != cen_x) {
m = fabs (((double)(wy - cen_y)) / ((double)(wx - cen_x)));
} else {
m = 0;
}
if (m <= ((double)(y2 - y1) / (double)(x2 - x1))) {
if (wx == cen_x) {
xmax = 0;
ymax = cen_y - y1;
} else {
xmax = cen_x - x1;
ymax = m * xmax;
}
} else {
ymax = cen_y - y1;
xmax = ymax / m;
}
rmax = sqrt ( (double)(sqr (xmax) + sqr (ymax)) );
t = ((cen_y - y1) < (cen_x - x1)) ? (cen_y - y1) : (cen_x - x1);
rmax = (rmax - t) / 100 * (100 - circle) + t;
phi = fmod (phi + angl, 2*M_PI);
if (pcvals.backwards)
x_calc = x2 - 1 - (x2 - x1 - 1)/(2*M_PI) * phi;
else
x_calc = (x2 - x1 - 1)/(2*M_PI) * phi + x1;
if (pcvals.inverse)
y_calc = (y2 - y1)/rmax * r + y1;
else
y_calc = y2 - (y2 - y1)/rmax * r;
xi = (int) (x_calc+0.5);
yi = (int) (y_calc+0.5);
if (WITHIN(0, xi, img_width - 1) && WITHIN(0, yi, img_height - 1)) {
*x = x_calc;
*y = y_calc;
inside = TRUE;
} else {
inside = FALSE;
}
} else {
if (pcvals.backwards)
phi = (2 * M_PI) * (x2 - wx) / xdiff;
else
phi = (2 * M_PI) * (wx - x1) / xdiff;
phi = fmod (phi + angl, 2 * M_PI);
if (phi >= 1.5 * M_PI)
phi2 = 2 * M_PI - phi;
else
if (phi >= M_PI)
phi2 = phi - M_PI;
else
if (phi >= 0.5 * M_PI)
phi2 = M_PI - phi;
else
phi2 = phi;
xx = tan (phi2);
if (xx != 0)
m = (double) 1.0 / xx;
else
m = 0;
if (m <= ((double)(ydiff) / (double)(xdiff)))
{
if (phi2 == 0)
{
xmax = 0;
ymax = ym - y1;
}
else
{
xmax = xm - x1;
ymax = m * xmax;
}
}
else
{
ymax = ym - y1;
xmax = ymax / m;
}
rmax = sqrt ((double)(sqr (xmax) + sqr (ymax)));
t = ((ym - y1) < (xm - x1)) ? (ym - y1) : (xm - x1);
rmax = (rmax - t) / 100.0 * (100 - circle) + t;
if (pcvals.inverse)
r = rmax * (double)((wy - y1) / (double)(ydiff));
else
r = rmax * (double)((y2 - wy) / (double)(ydiff));
xx = r * sin (phi2);
yy = r * cos (phi2);
if (phi >= 1.5 * M_PI)
{
x_calc = (double)xm - xx;
y_calc = (double)ym - yy;
}
else
if (phi >= M_PI)
{
x_calc = (double)xm - xx;
y_calc = (double)ym + yy;
}
else
if (phi >= 0.5 * M_PI)
{
x_calc = (double)xm + xx;
y_calc = (double)ym + yy;
}
else
{
x_calc = (double)xm + xx;
y_calc = (double)ym - yy;
}
xi = (int)(x_calc + 0.5);
yi = (int)(y_calc + 0.5);
if (WITHIN(0, xi, img_width - 1) && WITHIN(0, yi, img_height - 1)) {
*x = x_calc;
*y = y_calc;
inside = TRUE;
} else {
inside = FALSE;
}
}
return inside;
}
/* calc_undistorted_coords */
/*****/
static guchar
bilinear(double x, double y, guchar *values)
{
double m0, m1;
x = fmod(x, 1.0);
y = fmod(y, 1.0);
if (x < 0.0)
x += 1.0;
if (y < 0.0)
y += 1.0;
m0 = (double) values[0] + x * ((double) values[1] - values[0]);
m1 = (double) values[2] + x * ((double) values[3] - values[2]);
return (guchar) (m0 + y * (m1 - m0));
} /* bilinear */
/*****/
static pixel_fetcher_t *
pixel_fetcher_new(GDrawable *drawable)
{
pixel_fetcher_t *pf;
pf = g_malloc(sizeof(pixel_fetcher_t));
pf->col = -1;
pf->row = -1;
pf->img_width = gimp_drawable_width(drawable->id);
pf->img_height = gimp_drawable_height(drawable->id);
pf->img_bpp = gimp_drawable_bpp(drawable->id);
pf->img_has_alpha = gimp_drawable_has_alpha(drawable->id);
pf->tile_width = gimp_tile_width();
pf->tile_height = gimp_tile_height();
pf->bg_color[0] = 0;
pf->bg_color[1] = 0;
pf->bg_color[2] = 0;
pf->bg_color[3] = 0;
pf->drawable = drawable;
pf->tile = NULL;
return pf;
} /* pixel_fetcher_new */
/*****/
static void
pixel_fetcher_set_bg_color(pixel_fetcher_t *pf, guchar r, guchar g, guchar b, guchar a)
{
pf->bg_color[0] = r;
pf->bg_color[1] = g;
pf->bg_color[2] = b;
if (pf->img_has_alpha)
pf->bg_color[pf->img_bpp - 1] = a;
} /* pixel_fetcher_set_bg_color */
/*****/
static void
pixel_fetcher_get_pixel(pixel_fetcher_t *pf, int x, int y, guchar *pixel)
{
gint col, row;
gint coloff, rowoff;
guchar *p;
int i;
if ((x < sel_x1) || (x >= sel_x2) ||
(y < sel_y1) || (y >= sel_y2)) {
for (i = 0; i < pf->img_bpp; i++)
pixel[i] = pf->bg_color[i];
return;
} /* if */
col = x / pf->tile_width;
coloff = x % pf->tile_width;
row = y / pf->tile_height;
rowoff = y % pf->tile_height;
if ((col != pf->col) ||
(row != pf->row) ||
(pf->tile == NULL)) {
if (pf->tile != NULL)
gimp_tile_unref(pf->tile, FALSE);
pf->tile = gimp_drawable_get_tile(pf->drawable, FALSE, row, col);
gimp_tile_ref(pf->tile);
pf->col = col;
pf->row = row;
} /* if */
p = pf->tile->data + pf->img_bpp * (pf->tile->ewidth * rowoff + coloff);
for (i = pf->img_bpp; i; i--)
*pixel++ = *p++;
} /* pixel_fetcher_get_pixel */
/*****/
static void
pixel_fetcher_destroy(pixel_fetcher_t *pf)
{
if (pf->tile != NULL)
gimp_tile_unref(pf->tile, FALSE);
g_free(pf);
} /* pixel_fetcher_destroy */
/*****/
static void
build_preview_source_image(void)
{
double left, right, bottom, top;
double px, py;
double dx, dy;
int x, y;
guchar *p;
guchar pixel[4];
pixel_fetcher_t *pf;
pcint.check_row_0 = g_malloc(preview_width * sizeof(guchar));
pcint.check_row_1 = g_malloc(preview_width * sizeof(guchar));
pcint.image = g_malloc(preview_width * preview_height * 4 * sizeof(guchar));
pcint.dimage = g_malloc(preview_width * preview_height * 3 * sizeof(guchar));
left = sel_x1;
right = sel_x2 - 1;
bottom = sel_y2 - 1;
top = sel_y1;
dx = (right - left) / (preview_width - 1);
dy = (bottom - top) / (preview_height - 1);
py = top;
pf = pixel_fetcher_new(drawable);
p = pcint.image;
for (y = 0; y < preview_height; y++) {
px = left;
for (x = 0; x < preview_width; x++) {
/* Checks */
if ((x / CHECK_SIZE) & 1) {
pcint.check_row_0[x] = CHECK_DARK;
pcint.check_row_1[x] = CHECK_LIGHT;
} else {
pcint.check_row_0[x] = CHECK_LIGHT;
pcint.check_row_1[x] = CHECK_DARK;
} /* else */
/* Thumbnail image */
pixel_fetcher_get_pixel(pf, (int) px, (int) py, pixel);
if (img_bpp < 3) {
if (img_has_alpha)
pixel[3] = pixel[1];
else
pixel[3] = 255;
pixel[1] = pixel[0];
pixel[2] = pixel[0];
} else
if (!img_has_alpha)
pixel[3] = 255;
*p++ = pixel[0];
*p++ = pixel[1];
*p++ = pixel[2];
*p++ = pixel[3];
px += dx;
} /* for */
py += dy;
} /* for */
pixel_fetcher_destroy(pf);
} /* build_preview_source_image */
/*****/
static gint
polarize_dialog(void)
{
GtkWidget *dialog;
GtkWidget *top_table;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *button;
GtkWidget *toggle;
GtkWidget *hbox;
GtkTooltips *tips;
GdkColor tips_fg, tips_bg;
gint argc;
gchar **argv;
guchar *color_cube;
#if 0
printf("Waiting... (pid %d)\n", getpid());
kill(getpid(), SIGSTOP);
#endif
argc = 1;
argv = g_new(gchar *, 1);
argv[0] = g_strdup("polarize");
gtk_init(&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
gdk_set_use_xshm(gimp_use_xshm());
gtk_preview_set_gamma(gimp_gamma());
gtk_preview_set_install_cmap(gimp_install_cmap());
color_cube = gimp_color_cube();
gtk_preview_set_color_cube(color_cube[0], color_cube[1], color_cube[2], color_cube[3]);
gtk_widget_set_default_visual(gtk_preview_get_visual());
gtk_widget_set_default_colormap(gtk_preview_get_cmap());
build_preview_source_image();
dialog = gtk_dialog_new();
gtk_window_set_title(GTK_WINDOW(dialog), "Polarize");
gtk_window_position(GTK_WINDOW(dialog), GTK_WIN_POS_MOUSE);
gtk_container_border_width(GTK_CONTAINER(dialog), 0);
gtk_signal_connect(GTK_OBJECT(dialog), "destroy",
(GtkSignalFunc) dialog_close_callback,
NULL);
top_table = gtk_table_new(3, 3, FALSE);
gtk_container_border_width(GTK_CONTAINER(top_table), 6);
gtk_table_set_row_spacings(GTK_TABLE(top_table), 4);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), top_table, FALSE, FALSE, 0);
gtk_widget_show(top_table);
/* Initialize Tooltips */
/* use black as foreground: */
tips = gtk_tooltips_new ();
tips_fg.red = 0;
tips_fg.green = 0;
tips_fg.blue = 0;
/* postit yellow (khaki) as background: */
gdk_color_alloc (gtk_widget_get_colormap (dialog), &tips_fg);
tips_bg.red = 61669;
tips_bg.green = 59113;
tips_bg.blue = 35979;
gdk_color_alloc (gtk_widget_get_colormap (dialog), &tips_bg);
gtk_tooltips_set_colors (tips,&tips_bg,&tips_fg);
/* Preview */
frame = gtk_frame_new(NULL);
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
gtk_table_attach(GTK_TABLE(top_table), frame, 1, 2, 0, 1, 0, 0, 0, 0);
gtk_widget_show(frame);
pcint.preview = gtk_preview_new(GTK_PREVIEW_COLOR);
gtk_preview_size(GTK_PREVIEW(pcint.preview), preview_width, preview_height);
gtk_container_add(GTK_CONTAINER(frame), pcint.preview);
gtk_widget_show(pcint.preview);
/* Controls */
table = gtk_table_new(2, 3, FALSE);
gtk_container_border_width(GTK_CONTAINER(table), 0);
gtk_table_attach(GTK_TABLE(top_table), table, 0, 3, 1, 2, GTK_EXPAND | GTK_FILL, 0, 0, 0);
gtk_widget_show(table);
dialog_create_value("Circle depth in percent", GTK_TABLE(table), 0, &pcvals.circle, 0, 100.0, 1.0);
dialog_create_value("Offset angle", GTK_TABLE(table), 1, &pcvals.angle, 0, 359, 1.0);
/* togglebuttons for backwards, top, polar->rectangular */
hbox = gtk_hbox_new (TRUE, 2);
gtk_table_attach( GTK_TABLE(top_table), hbox, 0, 3, 2, 3,
GTK_FILL, 0 , 0, 0);
toggle = gtk_check_button_new_with_label("Map Backwards");
gtk_toggle_button_set_state( GTK_TOGGLE_BUTTON(toggle), pcvals.backwards);
gtk_signal_connect(GTK_OBJECT(toggle), "clicked",
(GtkSignalFunc) polar_toggle_callback,
&pcvals.backwards);
gtk_box_pack_start( GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_widget_show(toggle);
set_tooltip(tips,toggle,"If checked the mapping will begin at the right side, as opposed to beginning at the left.");
toggle = gtk_check_button_new_with_label("Map from Top");
gtk_toggle_button_set_state( GTK_TOGGLE_BUTTON(toggle), pcvals.inverse);
gtk_signal_connect( GTK_OBJECT(toggle), "clicked",
(GtkSignalFunc) polar_toggle_callback,
&pcvals.inverse);
gtk_box_pack_start( GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_widget_show(toggle);
set_tooltip(tips,toggle,"If unchecked the mapping will put the bottom row in the middle and the top row on the outside. If checked it will be the opposite.");
toggle = gtk_check_button_new_with_label("Polar to Rectangular");
gtk_toggle_button_set_state( GTK_TOGGLE_BUTTON(toggle), pcvals.polrec);
gtk_signal_connect( GTK_OBJECT(toggle), "clicked",
(GtkSignalFunc) polar_toggle_callback,
&pcvals.polrec);
gtk_box_pack_start( GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_widget_show(toggle);
set_tooltip(tips,toggle,"If unchecked the image will be circularly mapped onto a rectangle. If checked the image will be mapped onto a circle.");
gtk_widget_show(hbox);
/* Buttons */
gtk_container_border_width(GTK_CONTAINER(GTK_DIALOG(dialog)->action_area), 6);
button = gtk_button_new_with_label("OK");
GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
gtk_signal_connect(GTK_OBJECT(button), "clicked",
(GtkSignalFunc) dialog_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(GTK_OBJECT(button), "clicked",
(GtkSignalFunc) dialog_cancel_callback,
dialog);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->action_area), button, TRUE, TRUE, 0);
gtk_widget_show(button);
/* Done */
gtk_widget_show(dialog);
dialog_update_preview();
gtk_main();
gtk_object_unref(GTK_OBJECT(tips));
gdk_flush();
g_free(pcint.check_row_0);
g_free(pcint.check_row_1);
g_free(pcint.image);
g_free(pcint.dimage);
return pcint.run;
} /* polarize_dialog */
/*****/
static void
dialog_update_preview(void)
{
double left, right, bottom, top;
double dx, dy;
double px, py;
double cx, cy;
int ix, iy;
int x, y;
double scale_x, scale_y;
guchar *p_ul, *i, *p;
guchar *check_ul;
int check;
guchar outside[4];
gimp_palette_get_background(&outside[0], &outside[1], &outside[2]);
outside[3] = (img_has_alpha ? 0 : 255);
if (img_bpp < 3) {
outside[1] = outside[0];
outside[2] = outside[0];
} /* if */
left = sel_x1;
right = sel_x2 - 1;
bottom = sel_y2 - 1;
top = sel_y1;
dx = (right - left) / (preview_width - 1);
dy = (bottom - top) / (preview_height - 1);
scale_x = (double) preview_width / (right - left + 1);
scale_y = (double) preview_height / (bottom - top + 1);
py = top;
p_ul = pcint.dimage;
/* p_lr = pcint.dimage + 3 * (preview_width * preview_height - 1);*/
for (y = 0; y < preview_height; y++) {
px = left;
if ((y / CHECK_SIZE) & 1)
check_ul = pcint.check_row_0;
else
check_ul = pcint.check_row_1;
for (x = 0; x < preview_width; x++) {
calc_undistorted_coords(px, py, &cx, &cy);
cx = (cx - left) * scale_x;
cy = (cy - top) * scale_y;
ix = (int) (cx + 0.5);
iy = (int) (cy + 0.5);
check = check_ul[x];
if ((ix >= 0) && (ix < preview_width) &&
(iy >= 0) && (iy < preview_height))
i = pcint.image + 4 * (preview_width * iy + ix);
else
i = outside;
p_ul[0] = check + ((i[0] - check) * i[3]) / 255;
p_ul[1] = check + ((i[1] - check) * i[3]) / 255;
p_ul[2] = check + ((i[2] - check) * i[3]) / 255;
p_ul += 3;
px += dx;
} /* for */
py += dy;
} /* for */
p = pcint.dimage;
for (y = 0; y < img_height; y++) {
gtk_preview_draw_row(GTK_PREVIEW(pcint.preview), p, 0, y, preview_width);
p += preview_width * 3;
} /* for */
gtk_widget_draw(pcint.preview, NULL);
gdk_flush();
} /* dialog_update_preview */
/*****/
static void
dialog_create_value(char *title, GtkTable *table, int row, gdouble *value,
double left, double right, double step)
{
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,
step,
step,
0.0);
gtk_signal_connect(GTK_OBJECT(scale_data), "value_changed",
(GtkSignalFunc) dialog_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), 3);
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, "%0.3f", *value);
gtk_entry_set_text(GTK_ENTRY(entry), buf);
gtk_signal_connect(GTK_OBJECT(entry), "changed",
(GtkSignalFunc) dialog_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);
} /* dialog_create_value */
/*****/
static void
dialog_scale_update(GtkAdjustment *adjustment, gdouble *value)
{
GtkWidget *entry;
char buf[256];
if (*value != adjustment->value) {
*value = adjustment->value;
entry = gtk_object_get_user_data(GTK_OBJECT(adjustment));
sprintf(buf, "%0.3f", *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);
dialog_update_preview();
} /* if */
} /* dialog_scale_update */
/*****/
static void
dialog_entry_update(GtkWidget *widget, gdouble *value)
{
GtkAdjustment *adjustment;
gdouble new_value;
new_value = atof(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");
dialog_update_preview();
} /* if */
} /* if */
} /* dialog_entry_update */
/*****/
static void
dialog_close_callback(GtkWidget *widget, gpointer data)
{
gtk_main_quit();
} /* dialog_close_callback */
/*****/
static void
dialog_ok_callback(GtkWidget *widget, gpointer data)
{
pcint.run = TRUE;
gtk_widget_destroy(GTK_WIDGET(data));
} /* dialog_ok_callback */
/*****/
static void
dialog_cancel_callback(GtkWidget *widget, gpointer data)
{
gtk_widget_destroy(GTK_WIDGET(data));
} /* dialog_cancel_callback */
static void polar_toggle_callback (GtkWidget *widget, gpointer data)
{
int *toggle_val;
toggle_val = (int *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
*toggle_val = TRUE;
else
*toggle_val = FALSE;
dialog_update_preview();
}
static void
set_tooltip (GtkTooltips *tooltips, GtkWidget *widget, const char *desc)
{
if (desc && desc[0])
gtk_tooltips_set_tip (tooltips, widget, (char *) desc, NULL);
}
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