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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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-whirl-pinch"
#define PLUG_IN_BINARY "whirlpinch"
#define PLUG_IN_VERSION "May 1997, 2.09"
/***** Magic numbers *****/
#define SCALE_WIDTH 200
#define ENTRY_WIDTH 60
/***** Types *****/
typedef struct
{
gdouble whirl;
gdouble pinch;
gdouble radius;
} whirl_pinch_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 whirl_pinch (GimpDrawable *drawable);
static int calc_undistorted_coords (double wx,
double wy,
double whirl,
double pinch,
double *x,
double *y);
static gboolean whirl_pinch_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 whirl_pinch_vals_t wpvals =
{
90.0, /* whirl */
0.0, /* pinch */
1.0 /* radius */
};
static gint img_bpp, 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 double radius, radius2;
/***** Functions *****/
MAIN()
static void
query (void)
{
static const 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)" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("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_("W_hirl and Pinch..."),
"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];
GimpRunMode run_mode;
GimpPDBStatusType status;
double xhsiz, yhsiz;
GimpDrawable *drawable;
status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the active drawable info */
drawable = gimp_drawable_get (param[2].data.d_drawable);
img_bpp = gimp_drawable_bpp (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_x2, &sel_y2))
{
g_message (_("Region affected by plug-in is empty"));
return;
}
/* Set the tile cache size */
gimp_tile_cache_ntiles (2 * drawable->ntile_cols);
/* 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);
/* See how we will run */
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &wpvals);
/* Get information from the dialog */
if (!whirl_pinch_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* 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:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &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)))
{
/* Run! */
whirl_pinch (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, &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 (GimpDrawable *drawable)
{
GimpPixelRgn dest_rgn;
gint progress, max_progress;
guchar *top_row, *bot_row;
guchar *top_p, *bot_p;
gint row, col;
guchar **pixel;
gdouble whirl;
gdouble cx, cy;
gint ix, iy;
gint i;
GimpPixelFetcher *pft, *pfb;
GimpRGB background;
/* Initialize rows */
top_row = g_new (guchar, img_bpp * sel_width);
bot_row = g_new (guchar, img_bpp * sel_width);
pixel = g_new (guchar *, 4);
for (i = 0; i < 4; i++)
pixel[i] = g_new (guchar, 4);
/* Initialize pixel region */
gimp_pixel_rgn_init (&dest_rgn, drawable,
sel_x1, sel_y1, sel_width, sel_height, TRUE, TRUE);
pft = gimp_pixel_fetcher_new (drawable, FALSE);
pfb = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_context_get_background (&background);
gimp_pixel_fetcher_set_bg_color (pft, &background);
gimp_pixel_fetcher_set_bg_color (pfb, &background);
if (gimp_drawable_has_alpha (drawable->drawable_id))
{
gimp_pixel_fetcher_set_edge_mode (pft, GIMP_PIXEL_FETCHER_EDGE_BLACK);
gimp_pixel_fetcher_set_edge_mode (pfb, GIMP_PIXEL_FETCHER_EDGE_BLACK);
}
else
{
gimp_pixel_fetcher_set_edge_mode (pft, GIMP_PIXEL_FETCHER_EDGE_BACKGROUND);
gimp_pixel_fetcher_set_edge_mode (pfb, GIMP_PIXEL_FETCHER_EDGE_BACKGROUND);
}
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);
gimp_pixel_fetcher_get_pixel (pft, ix, iy, pixel[0]);
gimp_pixel_fetcher_get_pixel (pft, ix + 1, iy, pixel[1]);
gimp_pixel_fetcher_get_pixel (pft, ix, iy + 1, pixel[2]);
gimp_pixel_fetcher_get_pixel (pft, ix + 1, iy + 1, pixel[3]);
gimp_bilinear_pixels_8 (top_p, cx, cy, img_bpp, img_has_alpha,
pixel);
top_p += img_bpp;
/* 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);
gimp_pixel_fetcher_get_pixel (pfb, ix, iy, pixel[0]);
gimp_pixel_fetcher_get_pixel (pfb, ix + 1, iy, pixel[1]);
gimp_pixel_fetcher_get_pixel (pfb, ix, iy + 1, pixel[2]);
gimp_pixel_fetcher_get_pixel (pfb, ix + 1, iy + 1, pixel[3]);
gimp_bilinear_pixels_8 (bot_p, cx, cy, img_bpp, img_has_alpha,
pixel);
bot_p -= img_bpp;
}
else
{
/* We are outside the distortion area;
* just copy the source pixels
*/
/* Top */
gimp_pixel_fetcher_get_pixel (pft, col, row, pixel[0]);
for (i = 0; i < img_bpp; i++)
*top_p++ = pixel[0][i];
/* Bottom */
gimp_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);
}
gimp_pixel_fetcher_destroy (pft);
gimp_pixel_fetcher_destroy (pfb);
for (i = 0; i < 4; i++)
g_free (pixel[i]);
g_free (pixel);
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 gboolean
whirl_pinch_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *table;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Whirl and Pinch"), 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 (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_zoom_preview_new (drawable);
gtk_box_pack_start_defaults (GTK_BOX (main_vbox), preview);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (dialog_update_preview),
drawable);
/* Controls */
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_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,
_("_Whirl angle:"), SCALE_WIDTH, 7,
wpvals.whirl, -360.0, 360.0, 1.0, 15.0, 2,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&wpvals.whirl);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Pinch amount:"), SCALE_WIDTH, 7,
wpvals.pinch, -1.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&wpvals.pinch);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("_Radius:"), SCALE_WIDTH, 7,
wpvals.radius, 0.0, 2.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&wpvals.radius);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* 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 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;
guchar outside[4];
GimpRGB background;
gint width, height;
guchar *src, *dest;
gint j;
gimp_context_get_background (&background);
switch (img_bpp)
{
case 1:
outside[0] = outside[1] = outside [2] = gimp_rgb_luminance_uchar (&background);
outside[3] = 255;
break;
case 2:
outside[0] = outside[1] = outside [2] = gimp_rgb_luminance_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;
src = gimp_zoom_preview_get_source (GIMP_ZOOM_PREVIEW (preview),
&width, &height, &img_bpp);
dest = g_new (guchar, width * height * img_bpp);
dx = (right - left) / (width - 1);
dy = (bottom - top) / (height - 1);
whirl = wpvals.whirl * G_PI / 180.0;
radius2 = radius * radius * wpvals.radius;
scale_x = (double) width / (right - left + 1);
scale_y = (double) height / (bottom - top + 1);
py = top;
p_ul = dest;
p_lr = dest + img_bpp * (width * height - 1);
for (y = 0; y <= (height / 2); y++)
{
px = left;
for (x = 0; x < 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);
if ((ix >= 0) && (ix < width) &&
(iy >= 0) && (iy < height))
i = src + img_bpp * (width * iy + ix);
else
i = outside;
for (j = 0; j < img_bpp; j++)
p_ul[j] = i[j];
p_ul += img_bpp;
/* Lower right mirror */
ix = width - ix - 1;
iy = height - iy - 1;
if ((ix >= 0) && (ix < width) &&
(iy >= 0) && (iy < height))
i = src + img_bpp * (width * iy + ix);
else
i = outside;
for (j = 0; j < img_bpp; j++)
p_lr[j] = i[j];
p_lr -= img_bpp;
px += dx;
}
py += dy;
}
gimp_preview_draw_buffer (preview, dest, width * img_bpp);
g_free (src);
g_free (dest);
}
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