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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 "config.h"
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_NAME "plug_in_whirl_pinch"
#define PLUG_IN_VERSION "May 1997, 2.09"
/***** Magic numbers *****/
#define PREVIEW_SIZE 128
#define SCALE_WIDTH 200
#define ENTRY_WIDTH 60
/***** 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];
GimpDrawable *drawable;
GimpTile *tile;
} pixel_fetcher_t;
/***** Prototypes *****/
static void query (void);
static void run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **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 (GimpDrawable *drawable);
static void pixel_fetcher_set_bg_color (pixel_fetcher_t *pf);
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_scale_update (GtkAdjustment *adjustment, gdouble *value);
static void dialog_ok_callback (GtkWidget *widget, gpointer data);
/***** Variables *****/
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run /* run_proc */
};
static whirl_pinch_vals_t wpvals =
{
90.0, /* whirl */
0.0, /* pinch */
1.0 /* radius */
};
static whirl_pinch_interface_t wpint =
{
NULL, /* preview */
NULL, /* check_row_0 */
NULL, /* check_row_1 */
NULL, /* image */
NULL, /* dimage */
FALSE /* run */
};
static GimpDrawable *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 GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_FLOAT, "whirl", "Whirl angle (degrees)" },
{ GIMP_PDB_FLOAT, "pinch", "Pinch amount" },
{ GIMP_PDB_FLOAT, "radius", "Radius (1.0 is the largest circle that fits in the image, "
"and 2.0 goes all the way to the corners)" }
};
static gint nargs = sizeof (args) / sizeof (args[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,
N_("<Image>/Filters/Distorts/Whirl and Pinch..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
nargs, 0,
args, NULL);
}
static void
run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpRunModeType run_mode;
GimpPDBStatusType status;
double xhsiz, yhsiz;
int pwidth, pheight;
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;
/* 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_bpp = gimp_drawable_bpp (drawable->drawable_id);
img_has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
gimp_drawable_mask_bounds (drawable->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;
}
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;
}
preview_width = MAX (pwidth, 2); /* Min size is 2 */
preview_height = MAX (pheight, 2);
/* See how we will run */
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
INIT_I18N_UI();
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_NAME, &wpvals);
/* Get information from the dialog */
if (!whirl_pinch_dialog ())
return;
break;
case GIMP_RUN_NONINTERACTIVE:
INIT_I18N();
/* Make sure all the arguments are present */
if (nparams != 6)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
wpvals.whirl = param[3].data.d_float;
wpvals.pinch = param[4].data.d_float;
wpvals.radius = param[5].data.d_float;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
INIT_I18N();
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_NAME, &wpvals);
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! */
whirl_pinch ();
/* 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_NAME, &wpvals, sizeof (whirl_pinch_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
whirl_pinch (void)
{
GimpPixelRgn 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;
pixel_fetcher_t *pft, *pfb;
/* 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);
pixel_fetcher_set_bg_color (pft);
pixel_fetcher_set_bg_color (pfb);
progress = 0;
max_progress = sel_width * sel_height;
gimp_progress_init (_("Whirling and pinching..."));
whirl = wpvals.whirl * G_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);
}
/* 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);
}
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! */
}
}
/* 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);
}
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->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id,
sel_x1, sel_y1, sel_width, sel_height);
}
static gint
calc_undistorted_coords (gdouble wx,
gdouble wy,
gdouble whirl,
gdouble pinch,
gdouble *x,
gdouble *y)
{
gdouble dx, dy;
gdouble d, factor;
gdouble dist;
gdouble ang, sina, cosa;
gint 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 (G_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;
}
return inside;
}
static guchar
bilinear (gdouble x,
gdouble y,
guchar *values)
{
gdouble 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));
}
static pixel_fetcher_t *
pixel_fetcher_new (GimpDrawable *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->drawable_id);
pf->img_height = gimp_drawable_height (drawable->drawable_id);
pf->img_bpp = gimp_drawable_bpp (drawable->drawable_id);
pf->img_has_alpha = gimp_drawable_has_alpha (drawable->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;
}
static void
pixel_fetcher_set_bg_color (pixel_fetcher_t *pf)
{
GimpRGB background;
gimp_palette_get_background (&background);
switch (pf->img_bpp)
{
case 1:
case 2:
pf->bg_color[0] = gimp_rgb_intensity (&background) * 255.0;
break;
case 3:
case 4:
gimp_rgb_get_uchar (&background,
pf->bg_color, pf->bg_color + 1, pf->bg_color + 2);
break;
}
}
static void
pixel_fetcher_get_pixel (pixel_fetcher_t *pf,
gint x,
gint y,
guchar *pixel)
{
gint col, row;
gint coloff, rowoff;
guchar *p;
gint 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;
}
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;
}
p = pf->tile->data + pf->img_bpp * (pf->tile->ewidth * rowoff + coloff);
for (i = pf->img_bpp; i; i--)
*pixel++ = *p++;
}
static void
pixel_fetcher_destroy (pixel_fetcher_t *pf)
{
if (pf->tile != NULL)
gimp_tile_unref (pf->tile, FALSE);
g_free (pf);
}
static void
build_preview_source_image (void)
{
gdouble left, right, bottom, top;
gdouble px, py;
gdouble dx, dy;
gint x, y;
guchar *p;
guchar pixel[4];
pixel_fetcher_t *pf;
wpint.check_row_0 = g_new (guchar, preview_width);
wpint.check_row_1 = g_new (guchar, preview_width);
wpint.image = g_new (guchar, preview_width * preview_height * 4);
wpint.dimage = g_new (guchar, preview_width * preview_height * 3);
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 / GIMP_CHECK_SIZE) & 1)
{
wpint.check_row_0[x] = GIMP_CHECK_DARK * 255;
wpint.check_row_1[x] = GIMP_CHECK_LIGHT * 255;
}
else
{
wpint.check_row_0[x] = GIMP_CHECK_LIGHT * 255;
wpint.check_row_1[x] = GIMP_CHECK_DARK * 255;
}
/* 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;
}
py += dy;
}
pixel_fetcher_destroy (pf);
}
static gint
whirl_pinch_dialog (void)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *frame;
GtkWidget *abox;
GtkWidget *pframe;
GtkWidget *table;
GtkObject *adj;
gimp_ui_init ("whirlpinch", TRUE);
build_preview_source_image ();
dialog = gimp_dialog_new ( _("Whirl and Pinch"), "whirlpinch",
gimp_standard_help_func, "filters/whirlpinch.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
GTK_STOCK_OK, dialog_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
GTK_STOCK_CANCEL, gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dialog), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
main_vbox = gtk_vbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG(dialog)->vbox), main_vbox,
FALSE, FALSE, 0);
gtk_widget_show (main_vbox);
/* Preview */
frame = gtk_frame_new (_("Preview"));
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
abox = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);
gtk_container_add (GTK_CONTAINER (frame), abox);
gtk_widget_show (abox);
pframe = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (pframe), GTK_SHADOW_IN);
gtk_container_set_border_width (GTK_CONTAINER (pframe), 4);
gtk_container_add (GTK_CONTAINER (abox), pframe);
gtk_widget_show (pframe);
/* Preview */
wpint.preview = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (wpint.preview),
preview_width, preview_height);
gtk_container_add (GTK_CONTAINER (pframe), wpint.preview);
gtk_widget_show (wpint.preview);
/* Controls */
frame = gtk_frame_new (_("Parameter Settings"));
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Whirl Angle:"), SCALE_WIDTH, 0,
wpvals.whirl, -360.0, 360.0, 1.0, 15.0, 2,
TRUE, 0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (dialog_scale_update),
&wpvals.whirl);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("Pinch Amount:"), SCALE_WIDTH, 0,
wpvals.pinch, -1.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (dialog_scale_update),
&wpvals.pinch);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("Radius:"), SCALE_WIDTH, 0,
wpvals.radius, 0.0, 2.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (dialog_scale_update),
&wpvals.radius);
/* 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;
}
static void
dialog_update_preview (void)
{
gdouble left, right, bottom, top;
gdouble dx, dy;
gdouble px, py;
gdouble cx, cy;
gint ix, iy;
gint x, y;
gdouble whirl;
gdouble scale_x, scale_y;
guchar *p_ul, *p_lr, *i, *p;
guchar *check_ul, *check_lr;
gint check;
guchar outside[4];
GimpRGB background;
gimp_palette_get_background (&background);
switch (img_bpp)
{
case 1:
outside[0] = outside[1] = outside [2] = gimp_rgb_intensity_uchar (&background);
outside[3] = 255;
break;
case 2:
outside[0] = outside[1] = outside [2] = gimp_rgb_intensity_uchar (&background);
outside[3] = 0;
break;
case 3:
gimp_rgb_get_uchar (&background,
&outside[0], &outside[1], &outside[2]);
outside[3] = 255;
break;
case 4:
gimp_rgb_get_uchar (&background,
&outside[0], &outside[1], &outside[2]);
outside[3] = 0;
break;
}
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 * G_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 / GIMP_CHECK_SIZE) & 1)
check_ul = wpint.check_row_0;
else
check_ul = wpint.check_row_1;
if (((preview_height - y - 1) / GIMP_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;
}
py += dy;
}
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;
}
gtk_widget_draw (wpint.preview, NULL);
gdk_flush ();
}
static void
dialog_scale_update (GtkAdjustment *adjustment,
gdouble *value)
{
gimp_double_adjustment_update (adjustment, value);
dialog_update_preview ();
}
static void
dialog_ok_callback (GtkWidget *widget,
gpointer data)
{
wpint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
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