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gimp/plug-ins/common/blur.c

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/****************************************************************************
* This is a plugin for GIMP v 0.99.8 or later. Documentation is
* available at http://www.rru.com/~meo/gimp/ .
*
* Copyright (C) 1997-98 Miles O'Neal <meo@rru.com> http://www.rru.com/~meo/
* Blur code Copyright (C) 1995 Spencer Kimball and Peter Mattis
* GUI based on GTK code from:
* alienmap (Copyright (C) 1996, 1997 Daniel Cotting)
* plasma (Copyright (C) 1996 Stephen Norris),
* oilify (Copyright (C) 1996 Torsten Martinsen),
* ripple (Copyright (C) 1997 Brian Degenhardt) and
* whirl (Copyright (C) 1997 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/>.
*
****************************************************************************/
/****************************************************************************
* Blur:
*
* blur version 2.1 (10 June 2004 WES)
* history
* 2.1 - 10 June 2004 WES
* removed dialog along with randomization and repeat options
* 2.0 - 1 May 1998 MEO
* based on randomize 1.7
*
* Please send any patches or suggestions to the author: meo@rru.com .
*
* Blur applies a 3x3 blurring convolution kernel to the specified drawable.
*
* For each pixel in the selection or image,
* whether to change the pixel is decided by picking a
* random number, weighted by the user's "randomization" percentage.
* If the random number is in range, the pixel is modified. For
* blurring, an average is determined from the current and adjacent
* pixels. *(Except for the random factor, the blur code came
* straight from the original S&P blur plug-in.)*
*
* This works only with RGB and grayscale images.
*
****************************************************************************/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include "libgimp/stdplugins-intl.h"
/*********************************
*
* PLUGIN-SPECIFIC CONSTANTS
*
********************************/
#define PLUG_IN_PROC "plug-in-blur"
/*********************************
*
* LOCAL FUNCTIONS
*
********************************/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static void blur (GimpDrawable *drawable);
static inline void blur_prepare_row (GimpPixelRgn *pixel_rgn,
guchar *data,
gint x,
gint y,
gint w);
/************************************ Guts ***********************************/
MAIN ()
/*********************************
*
* query() - query_proc
*
* called by GIMP to learn about this plug-in
*
********************************/
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_install_procedure (PLUG_IN_PROC,
N_("Simple blur, fast but not very strong"),
"This plug-in blurs the specified drawable, using "
"a 3x3 blur. Indexed images are not supported.",
"Miles O'Neal <meo@rru.com>",
"Miles O'Neal, Spencer Kimball, Peter Mattis, "
"Torsten Martinsen, Brian Degenhardt, "
"Federico Mena Quintero, Stephen Norris, "
"Daniel Cotting",
"1995-1998",
N_("_Blur"),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
static GimpParam values[1];
INIT_I18N ();
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
*nreturn_vals = 1;
*return_vals = values;
if (strcmp (name, PLUG_IN_PROC) != 0 || nparams < 3)
{
values[0].data.d_status = GIMP_PDB_CALLING_ERROR;
return;
}
run_mode = param[0].data.d_int32;
drawable = gimp_drawable_get (param[2].data.d_drawable);
/*
* Make sure the drawable type is appropriate.
*/
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Blurring"));
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
blur (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
{
gimp_displays_flush ();
}
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
/*********************************
*
* blur_prepare_row()
*
* Get a row of pixels. If the requested row
* is off the edge, clone the edge row.
*
********************************/
static inline void
blur_prepare_row (GimpPixelRgn *pixel_rgn,
guchar *data,
gint x,
gint y,
gint w)
{
gint b;
y = CLAMP (y, 0, pixel_rgn->h - 1);
gimp_pixel_rgn_get_row (pixel_rgn, data, x, y, w);
/*
* Fill in edge pixels
*/
for (b = 0; b < pixel_rgn->bpp; b++)
data[-(gint)pixel_rgn->bpp + b] = data[b];
for (b = 0; b < pixel_rgn->bpp; b++)
data[w * pixel_rgn->bpp + b] = data[(w - 1) * pixel_rgn->bpp + b];
}
/*********************************
*
* blur()
*
* Actually mess with the image.
*
********************************/
static void
blur (GimpDrawable *drawable)
{
GimpPixelRgn srcPR, destPR;
gint width, height;
gint bytes;
guchar *dest, *d;
guchar *prev_row, *pr;
guchar *cur_row, *cr;
guchar *next_row, *nr;
guchar *tmp;
gint row, col;
gint x1, y1, x2, y2;
gint ind;
gboolean has_alpha;
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
/*
* Get the size of the input image. (This will/must be the same
* as the size of the output image. Also get alpha info.
*/
width = drawable->width;
height = drawable->height;
bytes = drawable->bpp;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
/*
* allocate row buffers
*/
prev_row = g_new (guchar, (x2 - x1 + 2) * bytes);
cur_row = g_new (guchar, (x2 - x1 + 2) * bytes);
next_row = g_new (guchar, (x2 - x1 + 2) * bytes);
dest = g_new (guchar, (x2 - x1) * bytes);
/*
* initialize the pixel regions
*/
gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable, 0, 0, width, height, TRUE, TRUE);
pr = prev_row + bytes;
cr = cur_row + bytes;
nr = next_row + bytes;
/*
* prepare the first row and previous row
*/
blur_prepare_row (&srcPR, pr, x1, y1 - 1, (x2 - x1));
blur_prepare_row (&srcPR, cr, x1, y1, (x2 - x1));
/*
* loop through the rows, applying the selected convolution
*/
for (row = y1; row < y2; row++)
{
/* prepare the next row */
blur_prepare_row (&srcPR, nr, x1, row + 1, (x2 - x1));
d = dest;
ind = 0;
for (col = 0; col < (x2 - x1) * bytes; col++)
{
ind++;
if (ind == bytes || !has_alpha)
{
/*
* If no alpha channel,
* or if there is one and this is it...
*/
*d++ = ((gint) pr[col - bytes] + (gint) pr[col] +
(gint) pr[col + bytes] +
(gint) cr[col - bytes] + (gint) cr[col] +
(gint) cr[col + bytes] +
(gint) nr[col - bytes] + (gint) nr[col] +
(gint) nr[col + bytes] + 4) / 9;
ind = 0;
}
else
{
/*
* otherwise we have an alpha channel,
* but this is a color channel
*/
*d++ = ROUND(
((gdouble) (pr[col - bytes] * pr[col - ind])
+ (gdouble) (pr[col] * pr[col + bytes - ind])
+ (gdouble) (pr[col + bytes] * pr[col + 2*bytes - ind])
+ (gdouble) (cr[col - bytes] * cr[col - ind])
+ (gdouble) (cr[col] * cr[col + bytes - ind])
+ (gdouble) (cr[col + bytes] * cr[col + 2*bytes - ind])
+ (gdouble) (nr[col - bytes] * nr[col - ind])
+ (gdouble) (nr[col] * nr[col + bytes - ind])
+ (gdouble) (nr[col + bytes] * nr[col + 2*bytes - ind]))
/ ((gdouble) pr[col - ind]
+ (gdouble) pr[col + bytes - ind]
+ (gdouble) pr[col + 2*bytes - ind]
+ (gdouble) cr[col - ind]
+ (gdouble) cr[col + bytes - ind]
+ (gdouble) cr[col + 2*bytes - ind]
+ (gdouble) nr[col - ind]
+ (gdouble) nr[col + bytes - ind]
+ (gdouble) nr[col + 2*bytes - ind]));
}
}
/*
* Save the modified row, shuffle the row pointers, and every
* so often, update the progress meter.
*/
gimp_pixel_rgn_set_row (&destPR, dest, x1, row, (x2 - x1));
tmp = pr;
pr = cr;
cr = nr;
nr = tmp;
if ((row % 32) == 0)
gimp_progress_update ((gdouble) row / (gdouble) (y2 - y1));
}
gimp_progress_update (1.0);
/*
* update the blurred region
*/
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
/*
* clean up after ourselves.
*/
g_free (prev_row);
g_free (cur_row);
g_free (next_row);
g_free (dest);
}
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