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gimp/plug-ins/common/unsharp.c

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/*
* Copyright (C) 1999 Winston Chang
* <winstonc@cs.wisc.edu>
* <winston@stdout.org>
*
* 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 <stdlib.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-unsharp-mask"
#define PLUG_IN_BINARY "unsharp"
#define SCALE_WIDTH 120
#define ENTRY_WIDTH 5
/* Uncomment this line to get a rough estimate of how long the plug-in
* takes to run.
*/
/* #define TIMER */
typedef struct
{
gdouble radius;
gdouble amount;
gint threshold;
} UnsharpMaskParams;
typedef struct
{
gboolean run;
} UnsharpMaskInterface;
/* local function prototypes */
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void blur_line (const gdouble *ctable,
const gdouble *cmatrix,
const gint cmatrix_length,
const guchar *src,
guchar *dest,
const gint len,
const gint bytes);
static gint gen_convolve_matrix (gdouble std_dev,
gdouble **cmatrix);
static gdouble * gen_lookup_table (const gdouble *cmatrix,
gint cmatrix_length);
static void unsharp_region (GimpPixelRgn *srcPTR,
GimpPixelRgn *dstPTR,
gint bytes,
gdouble radius,
gdouble amount,
gint x1,
gint x2,
gint y1,
gint y2,
gboolean show_progress);
static void unsharp_mask (GimpDrawable *drawable,
gdouble radius,
gdouble amount);
static gboolean unsharp_mask_dialog (GimpDrawable *drawable);
static void preview_update (GimpPreview *preview);
/* create a few globals, set default values */
static UnsharpMaskParams unsharp_params =
{
5.0, /* default radius */
0.5, /* default amount */
0 /* default threshold */
};
/* Setting PLUG_IN_INFO */
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "(unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Drawable to draw on" },
{ GIMP_PDB_FLOAT, "radius", "Radius of gaussian blur (in pixels > 1.0)" },
{ GIMP_PDB_FLOAT, "amount", "Strength of effect" },
{ GIMP_PDB_INT32, "threshold", "Threshold (0-255)" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("The most widely useful method for sharpening an image"),
"The unsharp mask is a sharpening filter that works "
"by comparing using the difference of the image and "
"a blurred version of the image. It is commonly "
"used on photographic images, and is provides a much "
"more pleasing result than the standard sharpen "
"filter.",
"Winston Chang <winstonc@cs.wisc.edu>",
"Winston Chang",
"1999",
N_("_Unsharp Mask..."),
"GRAY*, RGB*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Enhance");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpDrawable *drawable;
GimpRunMode run_mode;
#ifdef TIMER
GTimer *timer = g_timer_new ();
#endif
run_mode = param[0].data.d_int32;
*return_vals = values;
*nreturn_vals = 1;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
INIT_I18N ();
/*
* Get drawable information...
*/
drawable = gimp_drawable_get (param[2].data.d_drawable);
gimp_tile_cache_ntiles (2 * MAX (drawable->width / gimp_tile_width () + 1 ,
drawable->height / gimp_tile_height () + 1));
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data (PLUG_IN_PROC, &unsharp_params);
/* Reset default values show preview unmodified */
/* initialize pixel regions and buffer */
if (! unsharp_mask_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparams != 6)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
unsharp_params.radius = param[3].data.d_float;
unsharp_params.amount = param[4].data.d_float;
unsharp_params.threshold = param[5].data.d_int32;
/* make sure there are legal values */
if ((unsharp_params.radius < 0.0) ||
(unsharp_params.amount < 0.0))
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_PROC, &unsharp_params);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
drawable = gimp_drawable_get (param[2].data.d_drawable);
/* here we go */
unsharp_mask (drawable, unsharp_params.radius, unsharp_params.amount);
gimp_displays_flush ();
/* set data for next use of filter */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC,
&unsharp_params, sizeof (UnsharpMaskParams));
gimp_drawable_detach(drawable);
values[0].data.d_status = status;
}
#ifdef TIMER
g_printerr ("%f seconds\n", g_timer_elapsed (timer, NULL));
g_timer_destroy (timer);
#endif
}
/* This function is written as if it is blurring a column at a time,
* even though it can operate on rows, too. There is no difference
* in the processing of the lines, at least to the blur_line function.
*/
static void
blur_line (const gdouble *ctable,
const gdouble *cmatrix,
const gint cmatrix_length,
const guchar *src,
guchar *dest,
const gint len,
const gint bytes)
{
const gdouble *cmatrix_p;
const gdouble *ctable_p;
const guchar *src_p;
const guchar *src_p1;
const gint cmatrix_middle = cmatrix_length / 2;
gint row;
gint i, j;
/* This first block is the same as the optimized version --
* it is only used for very small pictures, so speed isn't a
* big concern.
*/
if (cmatrix_length > len)
{
for (row = 0; row < len; row++)
{
/* find the scale factor */
gdouble scale = 0;
for (j = 0; j < len; j++)
{
/* if the index is in bounds, add it to the scale counter */
if (j + cmatrix_middle - row >= 0 &&
j + cmatrix_middle - row < cmatrix_length)
scale += cmatrix[j];
}
src_p = src;
for (i = 0; i < bytes; i++)
{
gdouble sum = 0;
src_p1 = src_p++;
for (j = 0; j < len; j++)
{
if (j + cmatrix_middle - row >= 0 &&
j + cmatrix_middle - row < cmatrix_length)
sum += *src_p1 * cmatrix[j];
src_p1 += bytes;
}
*dest++ = (guchar) ROUND (sum / scale);
}
}
}
else
{
/* for the edge condition, we only use available info and scale to one */
for (row = 0; row < cmatrix_middle; row++)
{
/* find scale factor */
gdouble scale = 0;
for (j = cmatrix_middle - row; j < cmatrix_length; j++)
scale += cmatrix[j];
src_p = src;
for (i = 0; i < bytes; i++)
{
gdouble sum = 0;
src_p1 = src_p++;
for (j = cmatrix_middle - row; j < cmatrix_length; j++)
{
sum += *src_p1 * cmatrix[j];
src_p1 += bytes;
}
*dest++ = (guchar) ROUND (sum / scale);
}
}
/* go through each pixel in each col */
for (; row < len - cmatrix_middle; row++)
{
src_p = src + (row - cmatrix_middle) * bytes;
for (i = 0; i < bytes; i++)
{
gdouble sum = 0;
cmatrix_p = cmatrix;
src_p1 = src_p;
ctable_p = ctable;
for (j = 0; j < cmatrix_length; j++)
{
sum += cmatrix[j] * *src_p1;
src_p1 += bytes;
ctable_p += 256;
}
src_p++;
*dest++ = (guchar) ROUND (sum);
}
}
/* for the edge condition, we only use available info and scale to one */
for (; row < len; row++)
{
/* find scale factor */
gdouble scale = 0;
for (j = 0; j < len - row + cmatrix_middle; j++)
scale += cmatrix[j];
src_p = src + (row - cmatrix_middle) * bytes;
for (i = 0; i < bytes; i++)
{
gdouble sum = 0;
src_p1 = src_p++;
for (j = 0; j < len - row + cmatrix_middle; j++)
{
sum += *src_p1 * cmatrix[j];
src_p1 += bytes;
}
*dest++ = (guchar) ROUND (sum / scale);
}
}
}
}
static void
unsharp_mask (GimpDrawable *drawable,
gdouble radius,
gdouble amount)
{
GimpPixelRgn srcPR, destPR;
gint x1, y1, x2, y2;
/* initialize pixel regions */
gimp_pixel_rgn_init (&srcPR, drawable,
0, 0, drawable->width, drawable->height, FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable,
0, 0, drawable->width, drawable->height, TRUE, TRUE);
/* Get the input */
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
unsharp_region (&srcPR, &destPR, drawable->bpp,
radius, amount,
x1, x2, y1, y2,
TRUE);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, x2 - x1, y2 - y1);
}
/* Perform an unsharp mask on the region, given a source region, dest.
* region, width and height of the regions, and corner coordinates of
* a subregion to act upon. Everything outside the subregion is unaffected.
*/
static void
unsharp_region (GimpPixelRgn *srcPR,
GimpPixelRgn *destPR,
gint bytes,
gdouble radius,
gdouble amount,
gint x1,
gint x2,
gint y1,
gint y2,
gboolean show_progress)
{
guchar *src;
guchar *dest;
gint width = x2 - x1;
gint height = y2 - y1;
gdouble *cmatrix = NULL;
gint cmatrix_length;
gdouble *ctable;
gint row, col;
gint threshold = unsharp_params.threshold;
if (show_progress)
gimp_progress_init (_("Blurring"));
/* generate convolution matrix
and make sure it's smaller than each dimension */
cmatrix_length = gen_convolve_matrix (radius, &cmatrix);
/* generate lookup table */
ctable = gen_lookup_table (cmatrix, cmatrix_length);
/* allocate buffers */
src = g_new (guchar, MAX (width, height) * bytes);
dest = g_new (guchar, MAX (width, height) * bytes);
/* blur the rows */
for (row = 0; row < height; row++)
{
gimp_pixel_rgn_get_row (srcPR, src, x1, y1 + row, width);
blur_line (ctable, cmatrix, cmatrix_length, src, dest, width, bytes);
gimp_pixel_rgn_set_row (destPR, dest, x1, y1 + row, width);
if (show_progress && row % 8 == 0)
gimp_progress_update ((gdouble) row / (3 * height));
}
/* blur the cols */
for (col = 0; col < width; col++)
{
gimp_pixel_rgn_get_col (destPR, src, x1 + col, y1, height);
blur_line (ctable, cmatrix, cmatrix_length, src, dest, height, bytes);
gimp_pixel_rgn_set_col (destPR, dest, x1 + col, y1, height);
if (show_progress && col % 8 == 0)
gimp_progress_update ((gdouble) col / (3 * width) + 0.33);
}
if (show_progress)
gimp_progress_set_text (_("Merging"));
/* merge the source and destination (which currently contains
the blurred version) images */
for (row = 0; row < height; row++)
{
const guchar *s = src;
guchar *d = dest;
gint u, v;
/* get source row */
gimp_pixel_rgn_get_row (srcPR, src, x1, y1 + row, width);
/* get dest row */
gimp_pixel_rgn_get_row (destPR, dest, x1, y1 + row, width);
/* combine the two */
for (u = 0; u < width; u++)
{
for (v = 0; v < bytes; v++)
{
gint value;
gint diff = *s - *d;
/* do tresholding */
if (abs (2 * diff) < threshold)
diff = 0;
value = *s++ + amount * diff;
*d++ = CLAMP (value, 0, 255);
}
}
if (show_progress && row % 8 == 0)
gimp_progress_update ((gdouble) row / (3 * height) + 0.67);
gimp_pixel_rgn_set_row (destPR, dest, x1, y1 + row, width);
}
if (show_progress)
gimp_progress_update (1.0);
g_free (dest);
g_free (src);
g_free (ctable);
g_free (cmatrix);
}
/* generates a 1-D convolution matrix to be used for each pass of
* a two-pass gaussian blur. Returns the length of the matrix.
*/
static gint
gen_convolve_matrix (gdouble radius,
gdouble **cmatrix_p)
{
gdouble *cmatrix;
gdouble std_dev;
gdouble sum;
gint matrix_length;
gint i, j;
/* we want to generate a matrix that goes out a certain radius
* from the center, so we have to go out ceil(rad-0.5) pixels,
* inlcuding the center pixel. Of course, that's only in one direction,
* so we have to go the same amount in the other direction, but not count
* the center pixel again. So we double the previous result and subtract
* one.
* The radius parameter that is passed to this function is used as
* the standard deviation, and the radius of effect is the
* standard deviation * 2. It's a little confusing.
*/
radius = fabs (radius) + 1.0;
std_dev = radius;
radius = std_dev * 2;
/* go out 'radius' in each direction */
matrix_length = 2 * ceil (radius - 0.5) + 1;
if (matrix_length <= 0)
matrix_length = 1;
*cmatrix_p = g_new (gdouble, matrix_length);
cmatrix = *cmatrix_p;
/* Now we fill the matrix by doing a numeric integration approximation
* from -2*std_dev to 2*std_dev, sampling 50 points per pixel.
* We do the bottom half, mirror it to the top half, then compute the
* center point. Otherwise asymmetric quantization errors will occur.
* The formula to integrate is e^-(x^2/2s^2).
*/
/* first we do the top (right) half of matrix */
for (i = matrix_length / 2 + 1; i < matrix_length; i++)
{
gdouble base_x = i - (matrix_length / 2) - 0.5;
sum = 0;
for (j = 1; j <= 50; j++)
{
if (base_x + 0.02 * j <= radius)
sum += exp (- SQR (base_x + 0.02 * j) / (2 * SQR (std_dev)));
}
cmatrix[i] = sum / 50;
}
/* mirror the thing to the bottom half */
for (i = 0; i <= matrix_length / 2; i++)
cmatrix[i] = cmatrix[matrix_length - 1 - i];
/* find center val -- calculate an odd number of quanta to make it symmetric,
* even if the center point is weighted slightly higher than others. */
sum = 0;
for (j = 0; j <= 50; j++)
sum += exp (- SQR (0.5 + 0.02 * j) / (2 * SQR (std_dev)));
cmatrix[matrix_length / 2] = sum / 51;
/* normalize the distribution by scaling the total sum to one */
sum = 0;
for (i = 0; i < matrix_length; i++)
sum += cmatrix[i];
for (i = 0; i < matrix_length; i++)
cmatrix[i] = cmatrix[i] / sum;
return matrix_length;
}
/* ----------------------- gen_lookup_table ----------------------- */
/* generates a lookup table for every possible product of 0-255 and
each value in the convolution matrix. The returned array is
indexed first by matrix position, then by input multiplicand (?)
value.
*/
static gdouble *
gen_lookup_table (const gdouble *cmatrix,
gint cmatrix_length)
{
gdouble *lookup_table = g_new (gdouble, cmatrix_length * 256);
gdouble *lookup_table_p = lookup_table;
const gdouble *cmatrix_p = cmatrix;
gint i, j;
for (i = 0; i < cmatrix_length; i++)
{
for (j = 0; j < 256; j++)
*(lookup_table_p++) = *cmatrix_p * (gdouble) j;
cmatrix_p++;
}
return lookup_table;
}
static gboolean
unsharp_mask_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 (_("Unsharp Mask"), 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, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect (preview, "invalidated",
G_CALLBACK (preview_update),
NULL);
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,
_("_Radius:"), SCALE_WIDTH, ENTRY_WIDTH,
unsharp_params.radius, 0.1, 120.0, 0.1, 1.0, 1,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&unsharp_params.radius);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Amount:"), SCALE_WIDTH, ENTRY_WIDTH,
unsharp_params.amount, 0.0, 10.0, 0.01, 0.1, 2,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&unsharp_params.amount);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("_Threshold:"), SCALE_WIDTH, ENTRY_WIDTH,
unsharp_params.threshold,
0.0, 255.0, 1.0, 10.0, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&unsharp_params.threshold);
g_signal_connect_swapped (adj, "value-changed",
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;
}
static void
preview_update (GimpPreview *preview)
{
GimpDrawable *drawable;
gint x1, x2;
gint y1, y2;
gint x, y;
gint width, height;
gint border;
GimpPixelRgn srcPR;
GimpPixelRgn destPR;
drawable =
gimp_drawable_preview_get_drawable (GIMP_DRAWABLE_PREVIEW (preview));
gimp_pixel_rgn_init (&srcPR, drawable,
0, 0, drawable->width, drawable->height, FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable,
0, 0, drawable->width, drawable->height, TRUE, TRUE);
gimp_preview_get_position (preview, &x, &y);
gimp_preview_get_size (preview, &width, &height);
/* enlarge the region to avoid artefacts at the edges of the preview */
border = 2.0 * unsharp_params.radius + 0.5;
x1 = MAX (0, x - border);
y1 = MAX (0, y - border);
x2 = MIN (x + width + border, drawable->width);
y2 = MIN (y + height + border, drawable->height);
unsharp_region (&srcPR, &destPR, drawable->bpp,
unsharp_params.radius, unsharp_params.amount,
x1, x2, y1, y2,
FALSE);
gimp_pixel_rgn_init (&destPR, drawable, x, y, width, height, FALSE, TRUE);
gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview), &destPR);
}
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