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gimp/app/paint/gimpconvolve.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include "gdk/gdkkeysyms.h"
#include "appenv.h"
#include "drawable.h"
#include "errors.h"
#include "convolve.h"
#include "gdisplay.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "paint_options.h"
#include "selection.h"
#include "tool_options_ui.h"
#include "tools.h"
#include "gimage.h"
#include "libgimp/gimpintl.h"
#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
/* the convolve structures */
typedef struct _ConvolveOptions ConvolveOptions;
struct _ConvolveOptions
{
PaintOptions paint_options;
ConvolveType type;
ConvolveType type_d;
GtkWidget *type_w[2];
double pressure;
double pressure_d;
GtkObject *pressure_w;
};
/* the convolve tool options */
static ConvolveOptions * convolve_options = NULL;
/* local variables */
static int matrix [25];
static int matrix_size;
static int matrix_divisor;
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,
};
/* forward function declarations */
static void calculate_matrix (ConvolveType, double, 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 *);
/* functions */
static void
convolve_options_reset (void)
{
ConvolveOptions *options = convolve_options;
paint_options_reset ((PaintOptions *) options);
gtk_adjustment_set_value (GTK_ADJUSTMENT (options->pressure_w),
options->pressure_d);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->type_w[options->type_d]), TRUE);
}
static ConvolveOptions *
convolve_options_new (void)
{
ConvolveOptions *options;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *scale;
GtkWidget *frame;
gchar* type_label[2] = { N_("Blur"), N_("Sharpen") };
gint type_value[2] = { BLUR_CONVOLVE, SHARPEN_CONVOLVE };
/* the new convolve tool options structure */
options = (ConvolveOptions *) g_malloc (sizeof (ConvolveOptions));
paint_options_init ((PaintOptions *) options,
CONVOLVE,
convolve_options_reset);
options->type = options->type_d = BLUR_CONVOLVE;
options->pressure = options->pressure_d = 50.0;
/* the main vbox */
vbox = ((ToolOptions *) options)->main_vbox;
/* the pressure scale */
hbox = gtk_hbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Pressure:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
options->pressure_w =
gtk_adjustment_new (options->pressure_d, 0.0, 100.0, 1.0, 1.0, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->pressure_w));
gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (options->pressure_w), "value_changed",
(GtkSignalFunc) tool_options_double_adjustment_update,
&options->pressure);
gtk_widget_show (scale);
gtk_widget_show (hbox);
frame = tool_options_radio_buttons_new (N_("Convolve Type"),
&options->type,
options->type_w,
type_label,
type_value,
2);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->type_w[options->type_d]), TRUE);
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
return options;
}
void *
convolve_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
switch (state)
{
case MOTION_PAINT:
convolve_motion (paint_core, drawable);
break;
}
return NULL;
}
static void
convolve_modifier_key_func (Tool *tool,
GdkEventKey *kevent,
gpointer gdisp_ptr)
{
switch (kevent->keyval)
{
case GDK_Alt_L: case GDK_Alt_R:
break;
case GDK_Shift_L: case GDK_Shift_R:
break;
case GDK_Control_L: case GDK_Control_R:
switch (convolve_options->type)
{
case BLUR_CONVOLVE:
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (convolve_options->type_w[SHARPEN_CONVOLVE]), TRUE);
break;
case SHARPEN_CONVOLVE:
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (convolve_options->type_w[BLUR_CONVOLVE]), TRUE);
break;
default:
break;
}
break;
}
}
Tool *
tools_new_convolve ()
{
Tool * tool;
PaintCore * private;
/* The tool options */
if (! convolve_options)
{
convolve_options = convolve_options_new ();
tools_register (CONVOLVE, (ToolOptions *) convolve_options);
/* press all default buttons */
convolve_options_reset ();
}
tool = paint_core_new (CONVOLVE);
tool->modifier_key_func = convolve_modifier_key_func;
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) ||
(drawable_type (drawable) == INDEXEDA_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);
calculate_matrix (convolve_options->type, convolve_options->pressure,
paint_core->curpressure);
/* 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) (PAINT_OPTIONS_GET_OPACITY (convolve_options) * 255),
SOFT, INCREMENTAL);
}
static void
calculate_matrix (ConvolveType type,
double pressure,
double curpressure)
{
float percent;
/* find percent of tool pressure */
percent = (pressure / 100.0) * curpressure;
/* get the appropriate convolution matrix and size and divisor */
switch (type)
{
case BLUR_CONVOLVE:
matrix_size = 5;
blur_matrix [12] = MIN_BLUR + percent * (MAX_BLUR - MIN_BLUR);
copy_matrix (blur_matrix, custom_matrix, matrix_size);
break;
case SHARPEN_CONVOLVE:
matrix_size = 5;
sharpen_matrix [12] = MIN_SHARPEN + percent * (MAX_SHARPEN - MIN_SHARPEN);
copy_matrix (sharpen_matrix, custom_matrix, matrix_size);
break;
case CUSTOM_CONVOLVE:
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;
}
gboolean
convolve_non_gui (GimpDrawable *drawable,
double pressure,
int num_strokes,
double *stroke_array)
{
int i;
if (paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]))
{
/* 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 TRUE;
}
else
return FALSE;
}
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