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gimp/plug-ins/common/whirlpinch.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Whirl and Pinch plug-in --- two common distortions in one place
* Copyright (C) 1997 Federico Mena Quintero
* federico@nuclecu.unam.mx
* Copyright (C) 1997 Scott Goehring
* scott@poverty.bloomington.in.us
*
* 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.
*/
/* Version 2.09:
*
* - Another cool patch from Scott. The radius is now in [0.0, 2.0],
* with 1.0 being the default as usual. In addition to a minimal
* speed-up (one multiplication is eliminated in the calculation
* code), it is easier to think of nice round values instead of
* sqrt(2) :-)
*
* - Modified the way out-of-range pixels are handled. This time the
* plug-in handles `outside' pixels better; it paints them with the
* current background color (for images without transparency) or with
* a completely transparent background color (for images with
* transparency).
*/
/* Version 2.08:
*
* This is the first version of this plug-in. It is called 2.08
* because it came out of merging the old Whirl 2.08 and Pinch 2.08
* plug-ins. */
#include <math.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
/***** Magic numbers *****/
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif /* M_PI */
#ifndef M_PI_2
#define M_PI_2 1.57079632679489661923
#endif /* M_PI_2 */
#define PLUG_IN_NAME "plug_in_whirl_pinch"
#define PLUG_IN_VERSION "May 1997, 2.09"
#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 whirl;
gdouble pinch;
gdouble radius;
} whirl_pinch_vals_t;
typedef struct {
GtkWidget *preview;
guchar *check_row_0;
guchar *check_row_1;
guchar *image;
guchar *dimage;
gint run;
} whirl_pinch_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 whirl_pinch(void);
static int calc_undistorted_coords(double wx, double wy,
double whirl, double pinch,
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 whirl_pinch_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);
/***** Variables *****/
GPlugInInfo PLUG_IN_INFO = {
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run /* run_proc */
}; /* PLUG_IN_INFO */
static whirl_pinch_vals_t wpvals = {
90.0, /* whirl */
0.0, /* pinch */
1.0 /* radius */
}; /* wpvals */
static whirl_pinch_interface_t wpint = {
NULL, /* preview */
NULL, /* check_row_0 */
NULL, /* check_row_1 */
NULL, /* image */
NULL, /* dimage */
FALSE /* run */
}; /* wpint */
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;
static double radius, radius2;
/***** 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, "whirl", "Whirl angle (degrees)" },
{ PARAM_FLOAT, "pinch", "Pinch amount" },
{ PARAM_FLOAT, "radius", "Radius (1.0 is the largest circle that fits in the image, "
"and 2.0 goes all the way to the corners)" }
}; /* 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,
"Distort an image by whirling and pinching",
"Distorts the image by whirling and pinching, which are two common "
"center-based, circular distortions. Whirling is like projecting "
"the image onto the surface of water in a toilet and flushing. "
"Pinching is similar to projecting the image onto an elastic surface "
"and pressing or pulling on the center of the surface.",
"Federico Mena Quintero and Scott Goehring",
"Federico Mena Quintero and Scott Goehring",
PLUG_IN_VERSION,
"<Image>/Filters/Distorts/Whirl and Pinch",
"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 */
radius = MAX(xhsiz, yhsiz);
/* 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, &wpvals);
/* Get information from the dialog */
if (!whirl_pinch_dialog())
return;
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are present */
if (nparams != 6)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS) {
wpvals.whirl = param[3].data.d_float;
wpvals.pinch = param[4].data.d_float;
wpvals.radius = param[5].data.d_float;
} /* if */
break;
case RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data(PLUG_IN_NAME, &wpvals);
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! */
whirl_pinch();
/* 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, &wpvals, sizeof(whirl_pinch_vals_t));
} else if (status == STATUS_SUCCESS)
status = STATUS_EXECUTION_ERROR;
values[0].data.d_status = status;
gimp_drawable_detach(drawable);
} /* run */
/*****/
static void
whirl_pinch(void)
{
GPixelRgn dest_rgn;
gint progress, max_progress;
guchar *top_row, *bot_row;
guchar *top_p, *bot_p;
gint row, col;
guchar pixel[4][4];
guchar values[4];
double whirl;
double cx, cy;
int ix, iy;
int i;
guchar bg_color[4];
pixel_fetcher_t *pft, *pfb;
#if 0
printf("Waiting... (pid %d)\n", getpid());
kill(getpid(), SIGSTOP);
#endif
/* Initialize rows */
top_row = g_malloc(img_bpp * sel_width);
bot_row = g_malloc(img_bpp * sel_width);
/* Initialize pixel region */
gimp_pixel_rgn_init(&dest_rgn, drawable, sel_x1, sel_y1, sel_width, sel_height, TRUE, TRUE);
pft = pixel_fetcher_new(drawable);
pfb = 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));
pixel_fetcher_set_bg_color(pfb,
bg_color[0],
bg_color[1],
bg_color[2],
(img_has_alpha ? 0 : 255));
progress = 0;
max_progress = sel_width * sel_height;
gimp_progress_init("Whirling and pinching...");
whirl = wpvals.whirl * M_PI / 180;
radius2 = radius * radius * wpvals.radius;
for (row = sel_y1; row <= ((sel_y1 + sel_y2) / 2); row++) {
top_p = top_row;
bot_p = bot_row + img_bpp * (sel_width - 1);
for (col = sel_x1; col < sel_x2; col++) {
if (calc_undistorted_coords(col, row, whirl, wpvals.pinch, &cx, &cy)) {
/* We are inside the distortion area */
/* Top */
if (cx >= 0.0)
ix = (int) cx;
else
ix = -((int) -cx + 1);
if (cy >= 0.0)
iy = (int) cy;
else
iy = -((int) -cy + 1);
pixel_fetcher_get_pixel(pft, ix, iy, pixel[0]);
pixel_fetcher_get_pixel(pft, ix + 1, iy, pixel[1]);
pixel_fetcher_get_pixel(pft, ix, iy + 1, pixel[2]);
pixel_fetcher_get_pixel(pft, ix + 1, iy + 1, pixel[3]);
for (i = 0; i < img_bpp; i++) {
values[0] = pixel[0][i];
values[1] = pixel[1][i];
values[2] = pixel[2][i];
values[3] = pixel[3][i];
*top_p++ = bilinear(cx, cy, values);
} /* for */
/* Bottom */
cx = cen_x + (cen_x - cx);
cy = cen_y + (cen_y - cy);
if (cx >= 0.0)
ix = (int) cx;
else
ix = -((int) -cx + 1);
if (cy >= 0.0)
iy = (int) cy;
else
iy = -((int) -cy + 1);
pixel_fetcher_get_pixel(pfb, ix, iy, pixel[0]);
pixel_fetcher_get_pixel(pfb, ix + 1, iy, pixel[1]);
pixel_fetcher_get_pixel(pfb, ix, iy + 1, pixel[2]);
pixel_fetcher_get_pixel(pfb, ix + 1, iy + 1, pixel[3]);
for (i = 0; i < img_bpp; i++) {
values[0] = pixel[0][i];
values[1] = pixel[1][i];
values[2] = pixel[2][i];
values[3] = pixel[3][i];
*bot_p++ = bilinear(cx, cy, values);
} /* for */
bot_p -= 2 * img_bpp; /* We move backwards! */
} else {
/* We are outside the distortion area; just copy the source pixels */
/* Top */
pixel_fetcher_get_pixel(pft, col, row, pixel[0]);
for (i = 0; i < img_bpp; i++)
*top_p++ = pixel[0][i];
/* Bottom */
pixel_fetcher_get_pixel(pfb,
(sel_x2 - 1) - (col - sel_x1),
(sel_y2 - 1) - (row - sel_y1),
pixel[0]);
for (i = 0; i < img_bpp; i++)
*bot_p++ = pixel[0][i];
bot_p -= 2 * img_bpp; /* We move backwards! */
} /* else */
} /* for */
/* Paint rows to image */
gimp_pixel_rgn_set_row(&dest_rgn, top_row, sel_x1, row, sel_width);
gimp_pixel_rgn_set_row(&dest_rgn, bot_row, sel_x1, (sel_y2 - 1) - (row - sel_y1), sel_width);
/* Update progress */
progress += sel_width * 2;
gimp_progress_update((double) progress / max_progress);
} /* for */
pixel_fetcher_destroy(pft);
pixel_fetcher_destroy(pfb);
g_free(top_row);
g_free(bot_row);
gimp_drawable_flush(drawable);
gimp_drawable_merge_shadow(drawable->id, TRUE);
gimp_drawable_update(drawable->id, sel_x1, sel_y1, sel_width, sel_height);
} /* whirl_pinch */
/*****/
static int
calc_undistorted_coords(double wx, double wy,
double whirl, double pinch,
double *x, double *y)
{
double dx, dy;
double d, factor;
double dist;
double ang, sina, cosa;
int inside;
/* Distances to center, scaled */
dx = (wx - cen_x) * scale_x;
dy = (wy - cen_y) * scale_y;
/* Distance^2 to center of *circle* (scaled ellipse) */
d = dx * dx + dy * dy;
/* If we are inside circle, then distort. Else, just return the same position */
inside = (d < radius2);
if (inside) {
dist = sqrt(d / wpvals.radius) / radius;
/* Pinch */
factor = pow(sin(M_PI_2 * dist), -pinch);
dx *= factor;
dy *= factor;
/* Whirl */
factor = 1.0 - dist;
ang = whirl * factor * factor;
sina = sin(ang);
cosa = cos(ang);
*x = (cosa * dx - sina * dy) / scale_x + cen_x;
*y = (sina * dx + cosa * dy) / scale_y + cen_y;
} else {
*x = wx;
*y = wy;
} /* else */
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;
wpint.check_row_0 = g_malloc(preview_width * sizeof(guchar));
wpint.check_row_1 = g_malloc(preview_width * sizeof(guchar));
wpint.image = g_malloc(preview_width * preview_height * 4 * sizeof(guchar));
wpint.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 = wpint.image;
for (y = 0; y < preview_height; y++) {
px = left;
for (x = 0; x < preview_width; x++) {
/* Checks */
if ((x / CHECK_SIZE) & 1) {
wpint.check_row_0[x] = CHECK_DARK;
wpint.check_row_1[x] = CHECK_LIGHT;
} else {
wpint.check_row_0[x] = CHECK_LIGHT;
wpint.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
whirl_pinch_dialog(void)
{
GtkWidget *dialog;
GtkWidget *top_table;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *button;
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("whirlpinch");
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), "Whirl and Pinch");
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(2, 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);
/* 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);
wpint.preview = gtk_preview_new(GTK_PREVIEW_COLOR);
gtk_preview_size(GTK_PREVIEW(wpint.preview), preview_width, preview_height);
gtk_container_add(GTK_CONTAINER(frame), wpint.preview);
gtk_widget_show(wpint.preview);
/* Controls */
table = gtk_table_new(3, 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("Whirl angle", GTK_TABLE(table), 0, &wpvals.whirl, -360.0, 360.0, 1.0);
dialog_create_value("Pinch amount", GTK_TABLE(table), 1, &wpvals.pinch, -1.0, 1.0, 0.01);
dialog_create_value("Radius", GTK_TABLE(table), 2, &wpvals.radius, 0.0, 2.0, 0.01);
/* 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();
gdk_flush();
g_free(wpint.check_row_0);
g_free(wpint.check_row_1);
g_free(wpint.image);
g_free(wpint.dimage);
return wpint.run;
} /* whirl_pinch_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 whirl;
double scale_x, scale_y;
guchar *p_ul, *p_lr, *i, *p;
guchar *check_ul, *check_lr;
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);
whirl = wpvals.whirl * M_PI / 180.0;
radius2 = radius * radius * wpvals.radius;
scale_x = (double) preview_width / (right - left + 1);
scale_y = (double) preview_height / (bottom - top + 1);
py = top;
p_ul = wpint.dimage;
p_lr = wpint.dimage + 3 * (preview_width * preview_height - 1);
for (y = 0; y <= (preview_height / 2); y++) {
px = left;
if ((y / CHECK_SIZE) & 1)
check_ul = wpint.check_row_0;
else
check_ul = wpint.check_row_1;
if (((preview_height - y - 1) / CHECK_SIZE) & 1)
check_lr = wpint.check_row_0;
else
check_lr = wpint.check_row_1;
for (x = 0; x < preview_width; x++) {
calc_undistorted_coords(px, py, whirl, wpvals.pinch, &cx, &cy);
cx = (cx - left) * scale_x;
cy = (cy - top) * scale_y;
/* Upper left mirror */
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 = wpint.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;
/* Lower right mirror */
ix = preview_width - ix - 1;
iy = preview_height - iy - 1;
check = check_lr[preview_width - x - 1];
if ((ix >= 0) && (ix < preview_width) &&
(iy >= 0) && (iy < preview_height))
i = wpint.image + 4 * (preview_width * iy + ix);
else
i = outside;
p_lr[0] = check + ((i[0] - check) * i[3]) / 255;
p_lr[1] = check + ((i[1] - check) * i[3]) / 255;
p_lr[2] = check + ((i[2] - check) * i[3]) / 255;
p_lr -= 3;
px += dx;
} /* for */
py += dy;
} /* for */
p = wpint.dimage;
for (y = 0; y < preview_height; y++) {
gtk_preview_draw_row(GTK_PREVIEW(wpint.preview), p, 0, y, preview_width);
p += preview_width * 3;
} /* for */
gtk_widget_draw(wpint.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)
{
wpint.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 */
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