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gimp/plug-ins/common/shift.c

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/* Shift --- image filter plug-in for GIMP
* Copyright (C) 1997 Brian Degenhardt and Federico Mena Quintero
*
* 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/>.
*
* Please direct all comments, questions, bug reports etc to Brian Degenhardt
* bdegenha@ucsd.edu
*
* You can contact Federico Mena Quintero at quartic@polloux.fciencias.unam.mx
* You can contact the original GIMP authors at gimp@xcf.berkeley.edu
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define PLUG_IN_PROC "plug-in-shift"
#define PLUG_IN_BINARY "shift"
#define SPIN_BUTTON_WIDTH 8
#define TILE_CACHE_SIZE 16
#define HORIZONTAL 0
#define VERTICAL 1
typedef struct
{
gint shift_amount;
gint orientation;
} ShiftValues;
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void shift (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean shift_dialog (gint32 image_ID,
GimpDrawable *drawable);
static void shift_amount_callback (GtkWidget *widget,
gpointer data);
/***** Local vars *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static ShiftValues shvals =
{
5, /* shift amount */
HORIZONTAL /* orientation */
};
/***** 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 (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "shift-amount", "shift amount (0 <= shift_amount_x <= 200)" },
{ GIMP_PDB_INT32, "orientation", "vertical, horizontal orientation" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Shift each row of pixels by a random amount"),
"Shifts the pixels of the specified drawable. "
"Each row will be displaced a random value of pixels.",
"Spencer Kimball and Peter Mattis, ported by Brian "
"Degenhardt and Federico Mena Quintero",
"Brian Degenhardt",
"1997",
N_("_Shift..."),
"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;
gint32 image_ID;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
image_ID = param[1].data.d_int32;
INIT_I18N ();
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &shvals);
/* First acquire information with a dialog */
if (! shift_dialog (image_ID, drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
shvals.shift_amount = param[3].data.d_int32;
shvals.orientation = (param[4].data.d_int32) ? HORIZONTAL : VERTICAL;
if (shvals.shift_amount < 0 || shvals.shift_amount > 200)
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &shvals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Shifting"));
/* run the shift effect */
shift (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &shvals, sizeof (ShiftValues));
}
else
{
/* gimp_message ("shift: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
shift (GimpDrawable *drawable,
GimpPreview *preview)
{
GimpPixelRgn dest_rgn;
gpointer pr;
GimpPixelFetcher *pft;
gint width, height;
gint bytes;
guchar *destline;
guchar *dest;
gint x1, y1, x2, y2;
gint x, y;
gint progress, max_progress;
gint i, n = 0;
gint *offsets;
GRand *gr;
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
}
else
{
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = x2 - x1;
height = y2 - y1;
}
bytes = drawable->bpp;
progress = 0;
max_progress = width * height;
/* Shift the image. It's a pretty simple algorithm. If horizontal
is selected, then every row is shifted a random number of pixels
in the range of -shift_amount/2 to shift_amount/2. The effect is
just reproduced with columns if vertical is selected.
*/
n = (shvals.orientation == HORIZONTAL) ? height : width;
offsets = g_new (gint, n);
gr = g_rand_new ();
for (i = 0; i < n; i++)
offsets[i] = g_rand_int_range (gr,
- (shvals.shift_amount + 1) / 2.0,
+ (shvals.shift_amount + 1) / 2.0);
g_rand_free (gr);
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_pixel_fetcher_set_edge_mode (pft, GIMP_PIXEL_FETCHER_EDGE_WRAP);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, width, height, (preview == NULL), TRUE);
for (pr = gimp_pixel_rgns_register (1, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
destline = dest_rgn.data;
switch (shvals.orientation)
{
case HORIZONTAL:
for (y = dest_rgn.y; y < dest_rgn.y + dest_rgn.h; y++)
{
dest = destline;
for (x = dest_rgn.x; x < dest_rgn.x + dest_rgn.w; x++)
{
gimp_pixel_fetcher_get_pixel (pft,
x + offsets[y - y1], y, dest);
dest += bytes;
}
destline += dest_rgn.rowstride;
}
break;
case VERTICAL:
for (x = dest_rgn.x; x < dest_rgn.x + dest_rgn.w; x++)
{
dest = destline;
for (y = dest_rgn.y; y < dest_rgn.y + dest_rgn.h; y++)
{
gimp_pixel_fetcher_get_pixel (pft,
x, y + offsets[x - x1], dest);
dest += dest_rgn.rowstride;
}
destline += bytes;
}
break;
}
if (preview)
{
gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
&dest_rgn);
}
else
{
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
}
gimp_pixel_fetcher_destroy (pft);
g_free (offsets);
if (! preview)
{
/* update the region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
}
}
static gboolean
shift_dialog (gint32 image_ID,
GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *frame;
GtkWidget *size_entry;
GtkWidget *vertical;
GtkWidget *horizontal;
GimpUnit unit;
gdouble xres;
gdouble yres;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Shift"), 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 = gimp_drawable_preview_new (drawable, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (shift),
drawable);
frame = gimp_int_radio_group_new (FALSE, NULL,
G_CALLBACK (gimp_radio_button_update),
&shvals.orientation, shvals.orientation,
_("Shift _horizontally"),
HORIZONTAL, &horizontal,
_("Shift _vertically"),
VERTICAL, &vertical,
NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
g_signal_connect_swapped (horizontal, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (vertical, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Get the image resolution and unit */
gimp_image_get_resolution (image_ID, &xres, &yres);
unit = gimp_image_get_unit (image_ID);
size_entry = gimp_size_entry_new (1, unit, "%a", TRUE, FALSE, FALSE,
SPIN_BUTTON_WIDTH,
GIMP_SIZE_ENTRY_UPDATE_SIZE);
gimp_size_entry_set_unit (GIMP_SIZE_ENTRY (size_entry), GIMP_UNIT_PIXEL);
gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (size_entry), 0, xres, TRUE);
gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (size_entry), 0,
1.0, 200.0);
gtk_table_set_col_spacing (GTK_TABLE (size_entry), 0, 4);
gtk_table_set_col_spacing (GTK_TABLE (size_entry), 2, 12);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (size_entry), 0,
(gdouble) shvals.shift_amount);
gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (size_entry),
_("Shift _amount:"), 1, 0, 0.0);
g_signal_connect (size_entry, "value-changed",
G_CALLBACK (shift_amount_callback),
preview);
gtk_box_pack_start (GTK_BOX (main_vbox), size_entry, FALSE, FALSE, 0);
gtk_widget_show (size_entry);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
shift_amount_callback (GtkWidget *widget,
gpointer data)
{
GimpPreview *preview = GIMP_PREVIEW (data);
shvals.shift_amount = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (widget),
0);
gimp_preview_invalidate (preview);
}
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