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gimp/app/convolve.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include "appenv.h"
#include "brushes.h"
#include "drawable.h"
#include "errors.h"
#include "convolve.h"
#include "gdisplay.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "selection.h"
#include "tools.h"
typedef enum
{
Blur,
Sharpen,
Custom
} ConvolveType;
/* forward function declarations */
static void calculate_matrix (ConvolveType, double);
static void integer_matrix (float *, int *, int);
static void copy_matrix (float *, float *, int);
static int sum_matrix (int *, int);
static void convolve_motion (PaintCore *, GimpDrawable *);
static Argument * convolve_invoker (Argument *);
#define FIELD_COLS 4
#define MIN_BLUR 64 /* (8/9 original pixel) */
#define MAX_BLUR 0.25 /* (1/33 original pixel) */
#define MIN_SHARPEN -512
#define MAX_SHARPEN -64
typedef struct _ConvolveOptions ConvolveOptions;
struct _ConvolveOptions
{
ConvolveType type;
double pressure;
};
/* local variables */
static int matrix [25];
static int matrix_size;
static int matrix_divisor;
static ConvolveOptions *convolve_options = NULL;
static float custom_matrix [25] =
{
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
};
static float blur_matrix [25] =
{
0, 0, 0, 0, 0,
0, 1, 1, 1, 0,
0, 1, MIN_BLUR, 1, 0,
0, 1, 1, 1, 0,
0, 0 ,0, 0, 0,
};
static float sharpen_matrix [25] =
{
0, 0, 0, 0, 0,
0, 1, 1, 1, 0,
0, 1, MIN_SHARPEN, 1, 0,
0, 1, 1, 1, 0,
0, 0, 0, 0, 0,
};
static void
convolve_scale_update (GtkAdjustment *adjustment,
double *scale_val)
{
*scale_val = adjustment->value;
/* recalculate the matrix */
calculate_matrix (convolve_options->type, convolve_options->pressure);
}
static void
convolve_type_callback (GtkWidget *w,
gpointer client_data)
{
convolve_options->type = (ConvolveType) client_data;
/* recalculate the matrix */
calculate_matrix (convolve_options->type, convolve_options->pressure);
}
static ConvolveOptions *
create_convolve_options (void)
{
ConvolveOptions *options;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *pressure_scale;
GtkWidget *radio_box;
GtkWidget *radio_button;
GtkObject *pressure_scale_data;
GSList *group = NULL;
int i;
char *button_names[3] =
{
"Blur",
"Sharpen",
"Custom"
};
/* the new options structure */
options = (ConvolveOptions *) g_malloc (sizeof (ConvolveOptions));
options->type = Blur;
options->pressure = 50.0;
/* the main vbox */
vbox = gtk_vbox_new (FALSE, 2);
/* the main label */
label = gtk_label_new ("Convolver Options");
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
/* the pressure scale */
hbox = gtk_hbox_new (FALSE, 1);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new ("Pressure");
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
pressure_scale_data = gtk_adjustment_new (50.0, 0.0, 100.0, 1.0, 1.0, 0.0);
pressure_scale = gtk_hscale_new (GTK_ADJUSTMENT (pressure_scale_data));
gtk_box_pack_start (GTK_BOX (hbox), pressure_scale, TRUE, TRUE, 0);
gtk_scale_set_value_pos (GTK_SCALE (pressure_scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (pressure_scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (pressure_scale_data), "value_changed",
(GtkSignalFunc) convolve_scale_update,
&options->pressure);
gtk_widget_show (pressure_scale);
gtk_widget_show (hbox);
radio_box = gtk_vbox_new (FALSE, 2);
gtk_box_pack_start (GTK_BOX (vbox), radio_box, FALSE, FALSE, 0);
/* the radio buttons */
for (i = 0; i < 2; i++)
{
radio_button = gtk_radio_button_new_with_label (group, button_names[i]);
group = gtk_radio_button_group (GTK_RADIO_BUTTON (radio_button));
gtk_box_pack_start (GTK_BOX (radio_box), radio_button, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (radio_button), "toggled",
(GtkSignalFunc) convolve_type_callback,
(gpointer) ((long) i));
gtk_widget_show (radio_button);
}
gtk_widget_show (radio_box);
/* Register this selection options widget with the main tools options dialog */
tools_register_options (CONVOLVE, vbox);
return options;
}
void *
convolve_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
switch (state)
{
case INIT_PAINT:
/* calculate the matrix */
calculate_matrix (convolve_options->type, convolve_options->pressure);
break;
case MOTION_PAINT:
convolve_motion (paint_core, drawable);
break;
case FINISH_PAINT:
break;
}
return NULL;
}
Tool *
tools_new_convolve ()
{
Tool * tool;
PaintCore * private;
if (! convolve_options)
convolve_options = create_convolve_options ();
tool = paint_core_new (CONVOLVE);
private = (PaintCore *) tool->private;
private->paint_func = convolve_paint_func;
return tool;
}
void
tools_free_convolve (Tool *tool)
{
paint_core_free (tool);
}
static void
convolve_motion (PaintCore *paint_core,
GimpDrawable *drawable)
{
GImage *gimage;
TempBuf * area;
unsigned char *temp_data;
PixelRegion srcPR, destPR, tempPR;
if (! (gimage = drawable_gimage (drawable)))
return;
/* If the image type is indexed, don't convolve */
if (drawable_type (drawable) == INDEXED_GIMAGE)
return;
/* Get a region which can be used to paint to */
if (! (area = paint_core_get_paint_area (paint_core, drawable)))
return;
/* configure the pixel regions correctly */
pixel_region_init (&srcPR, drawable_data (drawable), area->x, area->y, area->width, area->height, FALSE);
destPR.bytes = area->bytes;
destPR.x = 0; destPR.y = 0;
destPR.w = area->width;
destPR.h = area->height;
destPR.rowstride = area->width * destPR.bytes;
destPR.data = temp_buf_data (area);
/* convolve the source image with the convolve mask */
if (srcPR.w >= matrix_size && srcPR.h >= matrix_size)
{
/* if the source has no alpha, then add alpha pixels */
if (!drawable_has_alpha (drawable))
{
/* note: this architecture needlessly convolves the totally-
opaque alpha channel. A faster approach would be to keep
tempPR the same number of bytes as srcPR, and extend the
paint_core_replace_canvas API to handle non-alpha images. */
tempPR.bytes = srcPR.bytes + 1;
tempPR.x = 0; tempPR.y = 0;
tempPR.w = area->width;
tempPR.h = area->height;
tempPR.rowstride = tempPR.bytes * tempPR.w;
temp_data = g_malloc (tempPR.h * tempPR.rowstride);
tempPR.data = temp_data;
add_alpha_region (&srcPR, &tempPR);
}
else
{
tempPR.bytes = srcPR.bytes;
tempPR.x = 0; tempPR.y = 0;
tempPR.w = area->width;
tempPR.h = area->height;
tempPR.rowstride = tempPR.bytes * tempPR.w;
temp_data = g_malloc (tempPR.h * tempPR.rowstride);
tempPR.data = temp_data;
copy_region (&srcPR, &tempPR);
tempPR.x = 0; tempPR.y = 0;
tempPR.w = area->width;
tempPR.h = area->height;
tempPR.data = temp_data;
multiply_alpha_region (&tempPR);
}
tempPR.x = 0; tempPR.y = 0;
tempPR.w = area->width;
tempPR.h = area->height;
tempPR.data = temp_data;
/* Convolve the region */
convolve_region (&tempPR, &destPR, matrix, matrix_size,
matrix_divisor, NORMAL);
if (drawable_has_alpha (drawable))
separate_alpha_region (&destPR);
/* Free the allocated temp space */
g_free (temp_data);
}
else
{
/* if the source has no alpha, then add alpha pixels, otherwise copy */
if (!drawable_has_alpha (drawable))
add_alpha_region (&srcPR, &destPR);
else
copy_region (&srcPR, &destPR);
}
/* paste the newly painted canvas to the gimage which is being worked on */
paint_core_replace_canvas (paint_core, drawable, OPAQUE_OPACITY,
(int) (get_brush_opacity () * 255),
SOFT, INCREMENTAL);
}
static void
calculate_matrix (ConvolveType type,
double pressure)
{
float percent;
/* find percent of tool pressure */
percent = pressure / 100.0;
/* get the appropriate convolution matrix and size and divisor */
switch (type)
{
case Blur:
matrix_size = 5;
blur_matrix [12] = MIN_BLUR + percent * (MAX_BLUR - MIN_BLUR);
copy_matrix (blur_matrix, custom_matrix, matrix_size);
break;
case Sharpen:
matrix_size = 5;
sharpen_matrix [12] = MIN_SHARPEN + percent * (MAX_SHARPEN - MIN_SHARPEN);
copy_matrix (sharpen_matrix, custom_matrix, matrix_size);
break;
case Custom:
matrix_size = 5;
break;
}
integer_matrix (custom_matrix, matrix, matrix_size);
matrix_divisor = sum_matrix (matrix, matrix_size);
if (!matrix_divisor)
matrix_divisor = 1;
}
static void
integer_matrix (float *source,
int *dest,
int size)
{
int i;
#define PRECISION 10000
for (i = 0; i < size*size; i++)
*dest++ = (int) (*source ++ * PRECISION);
}
static void
copy_matrix (float *src,
float *dest,
int size)
{
int i;
for (i = 0; i < size*size; i++)
*dest++ = *src++;
}
static int
sum_matrix (int *matrix,
int size)
{
int sum = 0;
size *= size;
while (size --)
sum += *matrix++;
return sum;
}
static void *
convolve_non_gui_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
convolve_motion (paint_core, drawable);
return NULL;
}
/* The convolve procedure definition */
ProcArg convolve_args[] =
{
{ PDB_IMAGE,
"image",
"the image"
},
{ PDB_DRAWABLE,
"drawable",
"the drawable"
},
{ PDB_FLOAT,
"pressure",
"the pressure: 0 <= pressure <= 100"
},
{ PDB_INT32,
"convolve_type",
"convolve type: { BLUR (0), SHARPEN (1) }"
},
{ PDB_INT32,
"num_strokes",
"number of stroke control points (count each coordinate as 2 points)"
},
{ PDB_FLOATARRAY,
"strokes",
"array of stroke coordinates: {s1.x, s1.y, s2.x, s2.y, ..., sn.x, sn.y}"
}
};
ProcRecord convolve_proc =
{
"gimp_convolve",
"Convolve (Blur, Sharpen) using the current brush",
"This tool convolves the specified drawable with either a sharpening or blurring kernel. The pressure parameter controls the magnitude of the operation. Like the paintbrush, this tool linearly interpolates between the specified stroke coordinates.",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1995-1996",
PDB_INTERNAL,
/* Input arguments */
6,
convolve_args,
/* Output arguments */
0,
NULL,
/* Exec method */
{ { convolve_invoker } },
};
static Argument *
convolve_invoker (Argument *args)
{
int success = TRUE;
GImage *gimage;
GimpDrawable *drawable;
double pressure;
ConvolveType type;
int num_strokes;
double *stroke_array;
ConvolveType int_value;
double fp_value;
int i;
drawable = NULL;
pressure = 100.0;
type = Blur;
num_strokes = 0;
/* the gimage */
if (success)
{
int_value = args[0].value.pdb_int;
if (! (gimage = gimage_get_ID (int_value)))
success = FALSE;
}
/* the drawable */
if (success)
{
int_value = args[1].value.pdb_int;
drawable = drawable_get_ID (int_value);
if (drawable == NULL || gimage != drawable_gimage (drawable))
success = FALSE;
}
/* the pressure */
if (success)
{
fp_value = args[2].value.pdb_int;
if (fp_value >= 0.0 && fp_value <= 100.0)
pressure = fp_value;
else
success = FALSE;
}
/* the convolve type */
if (success)
{
int_value = args[3].value.pdb_int;
switch (int_value)
{
case 0: type = Blur; break;
case 1: type = Sharpen; break;
case 2: success = FALSE; break; /*type = Custom; break;*/
default: success = FALSE;
}
}
/* num strokes */
if (success)
{
int_value = args[4].value.pdb_int;
if (int_value > 0)
num_strokes = int_value / 2;
else
success = FALSE;
}
/* point array */
if (success)
stroke_array = (double *) args[5].value.pdb_pointer;
if (success)
/* init the paint core */
success = paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]);
if (success)
{
/* calculate the convolution kernel */
calculate_matrix (type, pressure);
/* set the paint core's paint func */
non_gui_paint_core.paint_func = convolve_non_gui_paint_func;
non_gui_paint_core.startx = non_gui_paint_core.lastx = stroke_array[0];
non_gui_paint_core.starty = non_gui_paint_core.lasty = stroke_array[1];
if (num_strokes == 1)
convolve_non_gui_paint_func (&non_gui_paint_core, drawable, 0);
for (i = 1; i < num_strokes; i++)
{
non_gui_paint_core.curx = stroke_array[i * 2 + 0];
non_gui_paint_core.cury = stroke_array[i * 2 + 1];
paint_core_interpolate (&non_gui_paint_core, drawable);
non_gui_paint_core.lastx = non_gui_paint_core.curx;
non_gui_paint_core.lasty = non_gui_paint_core.cury;
}
/* finish the painting */
paint_core_finish (&non_gui_paint_core, drawable, -1);
/* cleanup */
paint_core_cleanup ();
}
return procedural_db_return_args (&convolve_proc, success);
}
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