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gimp/plug-ins/common/oilify.c

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/*
* This is a plug-in for the GIMP.
*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1996 Torsten Martinsen
*
* 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.
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-oilify"
#define PLUG_IN_BINARY "oilify"
#define SCALE_WIDTH 125
#define HISTSIZE 256
#define MODE_RGB 0
#define MODE_INTEN 1
typedef struct
{
gdouble mask_size;
gint mode;
gboolean preview;
} OilifyVals;
/* 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 oilify (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean oilify_dialog (GimpDrawable *drawable);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static OilifyVals ovals =
{
7.0, /* mask size */
MODE_INTEN, /* mode */
TRUE /* preview */
};
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "mask-size", "Oil paint mask size" },
{ GIMP_PDB_INT32, "mode", "Algorithm {RGB (0), INTENSITY (1)}" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Smear colors to simulate an oil painting"),
"This function performs the well-known oil-paint "
"effect on the specified drawable. The size of the "
"input mask is specified by 'mask_size'.",
"Torsten Martinsen",
"Torsten Martinsen",
"1996",
N_("Oili_fy..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Artistic");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
INIT_I18N ();
run_mode = param[0].data.d_int32;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
gimp_tile_cache_ntiles (2 * drawable->ntile_cols);
*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, &ovals);
/* First acquire information with a dialog */
if (! oilify_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
ovals.mask_size = (gdouble) param[3].data.d_int32;
ovals.mode = (gint) param[4].data.d_int32;
if ((ovals.mask_size < 1.0) ||
((ovals.mode != MODE_INTEN) &&
(ovals.mode != MODE_RGB)))
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &ovals);
break;
default:
break;
}
/* Make sure that the drawable is gray or RGB color */
if ((status == GIMP_PDB_SUCCESS) &&
(gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id)))
{
gimp_progress_init (_("Oil painting"));
oilify (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, &ovals, sizeof (OilifyVals));
}
else
{
/* gimp_message ("oilify: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
/*
* For each i in [0, HISTSIZE), hist[i] is the number of occurrences of the
* value i. Return a value in [0, HISTSIZE) weighted heavily toward the
* most frequent values in the histogram.
*
* Assuming that hist_max is the maximum number of occurrences for any
* value in the histogram, the weight given to each value i is
*
* weight = (hist[i] / hist_max)^8
*
* The 8 is subjective. Lower powers give fuzzier edges.
*/
static inline guchar
weighted_average_value (gint hist[HISTSIZE])
{
gint i;
gint max = 1;
gfloat weight;
gfloat sum = 0.0;
gfloat div = 1.0e-6;
gint value;
for (i = 0; i < HISTSIZE; i++)
max = MAX (max, hist[i]);
for (i = 0; i < HISTSIZE; i++)
{
weight = (gfloat) hist[i] / (gfloat) max;
weight *= weight;
weight *= weight;
weight *= weight; /* w' = w^8 */
sum += weight * (gfloat) i;
div += weight;
}
value = (gint) (sum / div);
return (guchar) CLAMP (value, 0, HISTSIZE - 1);
}
/*
* For each i in [0, HISTSIZE), hist[i] is the number of occurrences of
* pixels with intensity i. hist_rgb[][i] is the average color of those
* pixels with intensity i, each channel multiplied by hist[i]. Write to
* dest a pixel whose color is a weighted average of all the colors in
* hist_rgb[][], biased heavily toward those with the most frequently-
* occurring intensities (as noted in hist[]).
*
* The weight formula is the same as in weighted_average_value().
*/
static inline void
weighted_average_color (gint hist[HISTSIZE],
gint hist_rgb[4][HISTSIZE],
guchar *dest,
gint bytes)
{
gint i, b, c;
gint max = 1;
gfloat weight;
gfloat div = 1.0e-6;
gfloat color[4] = { 0.0, 0.0, 0.0, 0.0 };
for (i = 0; i < HISTSIZE; i++)
max = MAX (max, hist[i]);
for (i = 0; i < HISTSIZE; i++)
{
weight = (gfloat) hist[i] / (gfloat) max;
weight *= weight;
weight *= weight;
weight *= weight; /* w' = w^8 */
if (hist[i] > 0)
for (b = 0; b < bytes; b++)
color[b] += weight * (gfloat) hist_rgb[b][i] / (gfloat) hist[i];
div += weight;
}
for (b = 0; b < bytes; b++)
{
c = (gint) (color[b] / div);
dest[b] = (guchar) CLAMP (c, 0, HISTSIZE - 1);
}
}
/*
* For all x and y as desired, replace the pixel at (x,y)
* with a weighted average of the most frequently occurring
* values in a circle of radius n centered at (x,y).
*/
static void
oilify (GimpDrawable *drawable,
GimpPreview *preview)
{
gboolean use_inten_alg;
GimpPixelRgn src_rgn, dest_rgn;
gint bytes;
gint width, height;
guchar *src_row, *src;
guchar *dest_row, *dest;
gint x, y, b, c, xx, yy, n;
gint x1, y1, x2, y2;
gint x3, y3, x4, y4;
gint Hist[HISTSIZE];
gint Hist_rgb[4][HISTSIZE];
gpointer pr1;
gint progress, max_progress;
guchar *src_buf;
gchar *mask_shape;
gint y_off;
use_inten_alg = gimp_drawable_is_rgb (drawable->drawable_id) &&
ovals.mode == MODE_INTEN;
/* get the selection bounds */
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
}
else
{
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = x2 - x1;
height = y2 - y1;
}
progress = 0;
max_progress = width * height;
bytes = drawable->bpp;
n = (int) ovals.mask_size / 2;
/*
* mask_shape represents a (n+1)x(n+1) bitmap of one-quarter of a
* circular disk, with radius n and center at (0,0). This is used in the
* inner loop below so that we sample pixels only inside a circular area.
* (Think of it as a lookup-table implementation of a distance function,
* returning zero if the distance > n and nonzero otherwise.)
*/
mask_shape = g_new (gchar, (n + 1) * (n + 1));
for (x = 0; x <= n; x++)
for (y = 0; y <= n; y++)
mask_shape[y * (n + 1) + x] = x * x + y * y <= n * n;
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, width, height, (preview == NULL), TRUE);
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, width, height, FALSE, FALSE);
src_buf = g_new (guchar, width * height * bytes);
gimp_pixel_rgn_get_rect (&src_rgn, src_buf, x1, y1, width, height);
for (pr1 = gimp_pixel_rgns_register (1, &dest_rgn);
pr1 != NULL;
pr1 = gimp_pixel_rgns_process (pr1))
{
dest_row = dest_rgn.data;
for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
{
dest = dest_row;
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
{
if (use_inten_alg)
memset (Hist, 0, sizeof (Hist));
memset (Hist_rgb, 0, sizeof (Hist_rgb));
x3 = CLAMP ((x - n), x1, x2);
y3 = CLAMP ((y - n), y1, y2);
x4 = CLAMP ((x + n + 1), x1, x2);
y4 = CLAMP ((y + n + 1), y1, y2);
src_row = src_buf + ((y3 - y1) * width + (x3 - x1)) * bytes;
for (yy = y3 ; yy < y4 ; yy++)
{
y_off = ABS (yy - y) * (n + 1);
src = src_row;
for (xx = x3 ; xx < x4 ; xx++)
{
if (mask_shape[y_off + ABS(xx - x)])
{
if (use_inten_alg)
{
c = GIMP_RGB_LUMINANCE (src[0], src[1], src[2]);
++Hist[c];
for (b = 0; b < bytes; b++)
Hist_rgb[b][c] += src[b];
}
else
{
for (b = 0; b < bytes; b++)
++Hist_rgb[b][src[b]];
}
}
src += bytes;
}
src_row += width * bytes;
}
if (use_inten_alg)
{
weighted_average_color (Hist, Hist_rgb, dest, bytes);
}
else
{
for (b = 0; b < bytes; b++)
dest[b] = weighted_average_value (Hist_rgb[b]);
}
dest += bytes;
}
dest_row += dest_rgn.rowstride;
}
if (preview)
{
gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
&dest_rgn);
}
else
{
progress += dest_rgn.w * dest_rgn.h;
if ((progress % 5) == 0)
gimp_progress_update ((double) progress / (double) max_progress);
}
}
g_free (src_buf);
g_free (mask_shape);
if (!preview)
{
/* update the oil-painted region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
}
}
static gint
oilify_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *table;
GtkWidget *toggle;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Oilify"), 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_drawable_preview_new (drawable, &ovals.preview);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (oilify), drawable);
table = gtk_table_new (2, 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,
_("_Mask size:"), SCALE_WIDTH, 0,
ovals.mask_size, 3.0, 50.0, 1.0, 5.0, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&ovals.mask_size);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_check_button_new_with_mnemonic (_("_Use intensity"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 1, 2, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), ovals.mode);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&ovals.mode);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
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