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gimp/plug-ins/common/polar-coords.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Polarize plug-in --- maps a rectangle 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/* 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 "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define WITHIN(a, b, c) ((((a) <= (b)) && ((b) <= (c))) ? 1 : 0)
/***** Magic numbers *****/
#define PLUG_IN_PROC "plug-in-polar-coords"
#define PLUG_IN_BINARY "polar-coords"
#define PLUG_IN_VERSION "July 1997, 0.5"
#define SCALE_WIDTH 200
#define ENTRY_WIDTH 60
/***** Types *****/
typedef struct
{
gdouble circle;
gdouble angle;
gboolean backwards;
gboolean inverse;
gboolean polrec;
} polarize_vals_t;
/***** Prototypes *****/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void polarize (GimpDrawable *drawable);
static gboolean calc_undistorted_coords (double wx,
double wy,
double *x,
double *y);
static gboolean polarize_dialog (GimpDrawable *drawable);
static void dialog_update_preview (GimpDrawable *drawable,
GimpPreview *preview);
/***** Variables *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run /* run_proc */
};
static polarize_vals_t pcvals =
{
100.0, /* circle */
0.0, /* angle */
FALSE, /* backwards */
TRUE, /* inverse */
TRUE /* polar to rectangular? */
};
static gint img_width, img_height, img_has_alpha;
static gint sel_x1, sel_y1, sel_x2, sel_y2;
static gint sel_width, sel_height;
static double cen_x, cen_y;
static double scale_x, scale_y;
static guchar back_color[4];
/***** Functions *****/
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ GIMP_PDB_IMAGE, "image", "Input image" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_FLOAT, "circle", "Circle depth in %" },
{ GIMP_PDB_FLOAT, "angle", "Offset angle" },
{ GIMP_PDB_INT32, "backwards", "Map backwards { TRUE, FALSE }" },
{ GIMP_PDB_INT32, "inverse", "Map from top { TRUE, FALSE }" },
{ GIMP_PDB_INT32, "polrec", "Polar to rectangular { TRUE, FALSE }" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Convert image to or from polar coordinates"),
"Remaps and image from rectangular coordinates "
"to polar coordinates "
"or vice versa",
"Daniel Dunbar and Federico Mena Quintero",
"Daniel Dunbar and Federico Mena Quintero",
PLUG_IN_VERSION,
N_("P_olar Coordinates..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Distorts");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpPDBStatusType status;
GimpRunMode run_mode;
gdouble xhsiz, yhsiz;
GimpRGB background;
status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
*nreturn_vals = 1;
*return_vals = values;
INIT_I18N ();
/* Get the active drawable info */
drawable = gimp_drawable_get (param[2].data.d_drawable);
img_width = gimp_drawable_width (drawable->drawable_id);
img_height = gimp_drawable_height (drawable->drawable_id);
img_has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&sel_x1, &sel_y1, &sel_width, &sel_height))
return;
/* Calculate scaling parameters */
sel_x2 = sel_x1 + sel_width;
sel_y2 = sel_y1 + sel_height;
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;
}
/* Get background color */
gimp_context_get_background (&background);
gimp_rgb_set_alpha (&background, 0.0);
gimp_drawable_get_color_uchar (drawable->drawable_id, &background,
back_color);
/* See how we will run */
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &pcvals);
/* Get information from the dialog */
if (! polarize_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are present */
if (nparams != 8)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
pcvals.circle = param[3].data.d_float;
pcvals.angle = param[4].data.d_float;
pcvals.backwards = param[5].data.d_int32;
pcvals.inverse = param[6].data.d_int32;
pcvals.polrec = param[7].data.d_int32;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &pcvals);
break;
default:
break;
}
/* Distort the image */
if ((status == GIMP_PDB_SUCCESS) &&
(gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id)))
{
/* Set the tile cache size */
gimp_tile_cache_ntiles (2 * (drawable->width + gimp_tile_width() - 1) /
gimp_tile_width ());
/* Run! */
polarize (drawable);
/* If run mode is interactive, flush displays */
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &pcvals, sizeof (polarize_vals_t));
}
else if (status == GIMP_PDB_SUCCESS)
status = GIMP_PDB_EXECUTION_ERROR;
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
polarize_func (gint x,
gint y,
guchar *dest,
gint bpp,
gpointer data)
{
double cx, cy;
if (calc_undistorted_coords (x, y, &cx, &cy))
{
guchar pixel1[4], pixel2[4], pixel3[4], pixel4[4];
guchar *values[4];
GimpPixelFetcher *pft = (GimpPixelFetcher*) data;
values[0] = pixel1;
values[1] = pixel2;
values[2] = pixel3;
values[3] = pixel4;
gimp_pixel_fetcher_get_pixel (pft, cx, cy, pixel1);
gimp_pixel_fetcher_get_pixel (pft, cx + 1, cy, pixel2);
gimp_pixel_fetcher_get_pixel (pft, cx, cy + 1, pixel3);
gimp_pixel_fetcher_get_pixel (pft, cx + 1, cy + 1, pixel4);
gimp_bilinear_pixels_8 (dest, cx, cy, bpp, img_has_alpha, values);
}
else
{
gint b;
for (b = 0; b < bpp; b++)
{
dest[b] = back_color[b];
}
}
}
static void
polarize (GimpDrawable *drawable)
{
GimpRgnIterator *iter;
GimpPixelFetcher *pft;
GimpRGB background;
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_context_get_background (&background);
gimp_rgb_set_alpha (&background, 0.0);
gimp_pixel_fetcher_set_bg_color (pft, &background);
gimp_pixel_fetcher_set_edge_mode (pft, GIMP_PIXEL_FETCHER_EDGE_SMEAR);
gimp_progress_init (_("Polar coordinates"));
iter = gimp_rgn_iterator_new (drawable, 0);
gimp_rgn_iterator_dest (iter, polarize_func, pft);
gimp_rgn_iterator_free (iter);
gimp_pixel_fetcher_destroy (pft);
}
static gboolean
calc_undistorted_coords (gdouble wx,
gdouble wy,
gdouble *x,
gdouble *y)
{
gboolean inside;
gdouble phi, phi2;
gdouble xx, xm, ym, yy;
gint xdiff, ydiff;
gdouble r;
gdouble m;
gdouble xmax, ymax, rmax;
gdouble x_calc, y_calc;
gdouble xi, yi;
gdouble circle, angl, t, angle;
gint 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 = (gdouble) angle / 180.0 * G_PI;
if (pcvals.polrec)
{
if (wx >= cen_x)
{
if (wy > cen_y)
{
phi = G_PI - atan (((double)(wx - cen_x))/
((double)(wy - cen_y)));
}
else if (wy < cen_y)
{
phi = atan (((double)(wx - cen_x))/((double)(cen_y - wy)));
}
else
{
phi = G_PI / 2;
}
}
else if (wx < cen_x)
{
if (wy < cen_y)
{
phi = 2 * G_PI - atan (((double)(cen_x -wx)) /
((double)(cen_y - wy)));
}
else if (wy > cen_y)
{
phi = G_PI + atan (((double)(cen_x - wx))/
((double)(wy - cen_y)));
}
else
{
phi = 1.5 * G_PI;
}
}
r = sqrt (SQR (wx - cen_x) + SQR (wy - cen_y));
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*G_PI);
if (pcvals.backwards)
x_calc = x2 - 1 - (x2 - x1 - 1)/(2*G_PI) * phi;
else
x_calc = (x2 - x1 - 1)/(2*G_PI) * phi + x1;
if (pcvals.inverse)
y_calc = (y2 - y1)/rmax * r + y1;
else
y_calc = y2 - (y2 - y1)/rmax * r;
}
else
{
if (pcvals.backwards)
phi = (2 * G_PI) * (x2 - wx) / xdiff;
else
phi = (2 * G_PI) * (wx - x1) / xdiff;
phi = fmod (phi + angl, 2 * G_PI);
if (phi >= 1.5 * G_PI)
phi2 = 2 * G_PI - phi;
else if (phi >= G_PI)
phi2 = phi - G_PI;
else if (phi >= 0.5 * G_PI)
phi2 = G_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 * G_PI)
{
x_calc = (double)xm - xx;
y_calc = (double)ym - yy;
}
else if (phi >= G_PI)
{
x_calc = (double)xm - xx;
y_calc = (double)ym + yy;
}
else if (phi >= 0.5 * G_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);
inside = (WITHIN (0, xi, img_width - 1) && WITHIN (0, yi, img_height - 1));
if (inside)
{
*x = x_calc;
*y = y_calc;
}
return inside;
}
static gboolean
polarize_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *table;
GtkWidget *hbox;
GtkWidget *toggle;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Polar Coordinates"), PLUG_IN_BINARY,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dialog));
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox);
gtk_widget_show (main_vbox);
/* Preview */
preview = gimp_zoom_preview_new (drawable);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (dialog_update_preview),
drawable);
/* Controls */
table = gtk_table_new (2, 3, FALSE);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Circle _depth in percent:"), SCALE_WIDTH, 0,
pcvals.circle, 0.0, 100.0, 1.0, 10.0, 2,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&pcvals.circle);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("Offset _angle:"), SCALE_WIDTH, 0,
pcvals.angle, 0.0, 359.0, 1.0, 15.0, 2,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&pcvals.angle);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* togglebuttons for backwards, top, polar->rectangular */
hbox = gtk_hbox_new (TRUE, 6);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
toggle = gtk_check_button_new_with_mnemonic (_("_Map backwards"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pcvals.backwards);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_widget_show (toggle);
gimp_help_set_help_data (toggle,
_("If checked the mapping will begin at the right "
"side, as opposed to beginning at the left."),
NULL);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&pcvals.backwards);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_check_button_new_with_mnemonic (_("Map from _top"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pcvals.inverse);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_widget_show (toggle);
gimp_help_set_help_data (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."),
NULL);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&pcvals.inverse);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_check_button_new_with_mnemonic (_("To _polar"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pcvals.polrec);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_widget_show (toggle);
gimp_help_set_help_data (toggle,
_("If unchecked the image will be circularly "
"mapped onto a rectangle. If checked the image "
"will be mapped onto a circle."),
NULL);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&pcvals.polrec);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (hbox);
/* Done */
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
dialog_update_preview (GimpDrawable *drawable,
GimpPreview *preview)
{
gdouble cx, cy;
gint x, y;
gint sx, sy;
gint width, height;
guchar *pixel;
guchar outside[4];
GimpRGB background;
guchar *dest;
gint j;
gint bpp;
GimpPixelFetcher *pft;
guchar in_pixels[4][4];
guchar *in_values[4];
for (j = 0; j < 4; j++)
in_values[j] = in_pixels[j];
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_context_get_background (&background);
gimp_rgb_set_alpha (&background, 0.0);
gimp_drawable_get_color_uchar (drawable->drawable_id, &background, outside);
gimp_pixel_fetcher_set_bg_color (pft, &background);
gimp_pixel_fetcher_set_edge_mode (pft, GIMP_PIXEL_FETCHER_EDGE_SMEAR);
dest = gimp_zoom_preview_get_source (GIMP_ZOOM_PREVIEW (preview),
&width, &height, &bpp);
pixel = dest;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
gimp_preview_untransform (preview, x, y, &sx, &sy);
if (calc_undistorted_coords ((gdouble)sx, (gdouble)sy,
&cx, &cy))
{
gimp_pixel_fetcher_get_pixel (pft, cx, cy, in_pixels[0]);
gimp_pixel_fetcher_get_pixel (pft, cx + 1, cy, in_pixels[1]);
gimp_pixel_fetcher_get_pixel (pft, cx, cy + 1, in_pixels[2]);
gimp_pixel_fetcher_get_pixel (pft, cx + 1, cy + 1, in_pixels[3]);
gimp_bilinear_pixels_8 (pixel, cx, cy, bpp,
img_has_alpha, in_values);
}
else
{
for (j = 0; j < bpp; j++)
pixel[j] = outside[j];
}
pixel += bpp;
}
}
gimp_pixel_fetcher_destroy (pft);
gimp_preview_draw_buffer (preview, dest, width * bpp);
g_free (dest);
}
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