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gimp/app/core/gimpbrushgenerated.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimp_brush_generated module Copyright 1998 Jay Cox <jaycox@earthlink.net>
*
* 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 <glib-object.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "base/temp-buf.h"
#include "gimpbrushgenerated.h"
#include "gimpbrushgenerated-load.h"
#include "gimpbrushgenerated-save.h"
#define OVERSAMPLING 5
enum
{
PROP_0,
PROP_SHAPE,
PROP_RADIUS,
PROP_SPIKES,
PROP_HARDNESS,
PROP_ASPECT_RATIO,
PROP_ANGLE
};
/* local function prototypes */
static void gimp_brush_generated_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_brush_generated_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_brush_generated_dirty (GimpData *data);
static gchar * gimp_brush_generated_get_extension (GimpData *data);
static GimpData * gimp_brush_generated_duplicate (GimpData *data);
G_DEFINE_TYPE (GimpBrushGenerated, gimp_brush_generated, GIMP_TYPE_BRUSH)
#define parent_class gimp_brush_generated_parent_class
static void
gimp_brush_generated_class_init (GimpBrushGeneratedClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpDataClass *data_class = GIMP_DATA_CLASS (klass);
object_class->set_property = gimp_brush_generated_set_property;
object_class->get_property = gimp_brush_generated_get_property;
data_class->save = gimp_brush_generated_save;
data_class->dirty = gimp_brush_generated_dirty;
data_class->get_extension = gimp_brush_generated_get_extension;
data_class->duplicate = gimp_brush_generated_duplicate;
g_object_class_install_property (object_class, PROP_SHAPE,
g_param_spec_enum ("shape", NULL, NULL,
GIMP_TYPE_BRUSH_GENERATED_SHAPE,
GIMP_BRUSH_GENERATED_CIRCLE,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_RADIUS,
g_param_spec_double ("radius", NULL, NULL,
0.1, 4000.0, 5.0,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_SPIKES,
g_param_spec_int ("spikes", NULL, NULL,
2, 20, 2,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_HARDNESS,
g_param_spec_double ("hardness", NULL, NULL,
0.0, 1.0, 0.0,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_ASPECT_RATIO,
g_param_spec_double ("aspect-ratio",
NULL, NULL,
1.0, 20.0, 1.0,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_ANGLE,
g_param_spec_double ("angle", NULL, NULL,
0.0, 180.0, 0.0,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_brush_generated_init (GimpBrushGenerated *brush)
{
brush->shape = GIMP_BRUSH_GENERATED_CIRCLE;
brush->radius = 5.0;
brush->hardness = 0.0;
brush->aspect_ratio = 1.0;
brush->angle = 0.0;
}
static void
gimp_brush_generated_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (object);
switch (property_id)
{
case PROP_SHAPE:
gimp_brush_generated_set_shape (brush, g_value_get_enum (value));
break;
case PROP_RADIUS:
gimp_brush_generated_set_radius (brush, g_value_get_double (value));
break;
case PROP_SPIKES:
gimp_brush_generated_set_spikes (brush, g_value_get_int (value));
break;
case PROP_HARDNESS:
gimp_brush_generated_set_hardness (brush, g_value_get_double (value));
break;
case PROP_ASPECT_RATIO:
gimp_brush_generated_set_aspect_ratio (brush, g_value_get_double (value));
break;
case PROP_ANGLE:
gimp_brush_generated_set_angle (brush, g_value_get_double (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_brush_generated_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (object);
switch (property_id)
{
case PROP_SHAPE:
g_value_set_enum (value, brush->shape);
break;
case PROP_RADIUS:
g_value_set_double (value, brush->radius);
break;
case PROP_SPIKES:
g_value_set_int (value, brush->spikes);
break;
case PROP_HARDNESS:
g_value_set_double (value, brush->hardness);
break;
case PROP_ASPECT_RATIO:
g_value_set_double (value, brush->aspect_ratio);
break;
case PROP_ANGLE:
g_value_set_double (value, brush->angle);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gchar *
gimp_brush_generated_get_extension (GimpData *data)
{
return GIMP_BRUSH_GENERATED_FILE_EXTENSION;
}
static GimpData *
gimp_brush_generated_duplicate (GimpData *data)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (data);
return gimp_brush_generated_new (GIMP_OBJECT (brush)->name,
brush->shape,
brush->radius,
brush->spikes,
brush->hardness,
brush->aspect_ratio,
brush->angle);
}
static gdouble
gauss (gdouble f)
{
/* this aint' a real gauss function */
if (f < -0.5)
{
f = -1.0 - f;
return (2.0 * f*f);
}
if (f < 0.5)
return (1.0 - 2.0 * f*f);
f = 1.0 - f;
return (2.0 * f*f);
}
static void
gimp_brush_generated_dirty (GimpData *data)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (data);
GimpBrush *gbrush = GIMP_BRUSH (brush);
gint x, y;
guchar *centerp;
gdouble d;
gdouble exponent;
guchar a;
gint length;
gint width = 0;
gint height = 0;
guchar *lookup;
gdouble sum;
gdouble c, s, cs, ss;
gdouble short_radius;
gdouble buffer[OVERSAMPLING];
if (gbrush->mask)
temp_buf_free (gbrush->mask);
s = sin (gimp_deg_to_rad (brush->angle));
c = cos (gimp_deg_to_rad (brush->angle));
short_radius = brush->radius / brush->aspect_ratio;
gbrush->x_axis.x = c * brush->radius;
gbrush->x_axis.y = -1.0 * s * brush->radius;
gbrush->y_axis.x = s * short_radius;
gbrush->y_axis.y = c * short_radius;
switch (brush->shape)
{
case GIMP_BRUSH_GENERATED_CIRCLE:
width = ceil (sqrt (gbrush->x_axis.x * gbrush->x_axis.x +
gbrush->y_axis.x * gbrush->y_axis.x));
height = ceil (sqrt (gbrush->x_axis.y * gbrush->x_axis.y +
gbrush->y_axis.y * gbrush->y_axis.y));
break;
case GIMP_BRUSH_GENERATED_SQUARE:
width = ceil (fabs (gbrush->x_axis.x) + fabs (gbrush->y_axis.x));
height = ceil (fabs (gbrush->x_axis.y) + fabs (gbrush->y_axis.y));
break;
case GIMP_BRUSH_GENERATED_DIAMOND:
width = ceil (MAX (fabs (gbrush->x_axis.x), fabs (gbrush->y_axis.x)));
height = ceil (MAX (fabs (gbrush->x_axis.y), fabs (gbrush->y_axis.y)));
break;
default:
g_return_if_reached ();
}
if (brush->spikes > 2)
{
/* could be optimized by respecting the angle */
width = height = ceil (sqrt (brush->radius * brush->radius +
short_radius * short_radius));
gbrush->y_axis.x = s * brush->radius;
gbrush->y_axis.y = c * brush->radius;
}
gbrush->mask = temp_buf_new (width * 2 + 1,
height * 2 + 1,
1, width, height, NULL);
centerp = temp_buf_data (gbrush->mask) + height * gbrush->mask->width + width;
/* set up lookup table */
length = OVERSAMPLING * ceil (1 + sqrt (2 *
ceil (brush->radius + 1.0) *
ceil (brush->radius + 1.0)));
if ((1.0 - brush->hardness) < 0.0000004)
exponent = 1000000.0;
else
exponent = 0.4 / (1.0 - brush->hardness);
lookup = g_malloc (length);
sum = 0.0;
for (x = 0; x < OVERSAMPLING; x++)
{
d = fabs ((x + 0.5) / OVERSAMPLING - 0.5);
if (d > brush->radius)
buffer[x] = 0.0;
else
buffer[x] = gauss (pow (d / brush->radius, exponent));
sum += buffer[x];
}
for (x = 0; d < brush->radius || sum > 0.00001; d += 1.0 / OVERSAMPLING)
{
sum -= buffer[x % OVERSAMPLING];
if (d > brush->radius)
buffer[x % OVERSAMPLING] = 0.0;
else
buffer[x % OVERSAMPLING] = gauss (pow (d / brush->radius, exponent));
sum += buffer[x % OVERSAMPLING];
lookup[x++] = RINT (sum * (255.0 / OVERSAMPLING));
}
while (x < length)
{
lookup[x++] = 0;
}
cs = cos (- 2 * G_PI / brush->spikes);
ss = sin (- 2 * G_PI / brush->spikes);
/* for an even number of spikes compute one half and mirror it */
for (y = (brush->spikes % 2 ? -height : 0); y <= height; y++)
{
for (x = -width; x <= width; x++)
{
gdouble tx, ty, angle;
tx = c*x - s*y;
ty = fabs (s*x + c*y);
if (brush->spikes > 2)
{
angle = atan2 (ty, tx);
while (angle > G_PI / brush->spikes)
{
gdouble sx = tx, sy = ty;
tx = cs * sx - ss * sy;
ty = ss * sx + cs * sy;
angle -= 2 * G_PI / brush->spikes;
}
}
ty *= brush->aspect_ratio;
switch (brush->shape)
{
case GIMP_BRUSH_GENERATED_CIRCLE:
d = sqrt (tx*tx + ty*ty);
break;
case GIMP_BRUSH_GENERATED_SQUARE:
d = MAX (fabs (tx), fabs (ty));
break;
case GIMP_BRUSH_GENERATED_DIAMOND:
d = fabs (tx) + fabs (ty);
break;
}
if (d < brush->radius + 1)
a = lookup[(gint) RINT (d * OVERSAMPLING)];
else
a = 0;
centerp[ y * gbrush->mask->width + x] = a;
if (brush->spikes % 2 == 0)
centerp[-1 * y * gbrush->mask->width - x] = a;
}
}
g_free (lookup);
GIMP_DATA_CLASS (parent_class)->dirty (data);
}
GimpData *
gimp_brush_generated_new (const gchar *name,
GimpBrushGeneratedShape shape,
gfloat radius,
gint spikes,
gfloat hardness,
gfloat aspect_ratio,
gfloat angle)
{
GimpBrushGenerated *brush;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (*name != '\0', NULL);
brush = g_object_new (GIMP_TYPE_BRUSH_GENERATED,
"name", name,
"mime-type", "application/x-gimp-brush-generated",
"shape", shape,
"radius", radius,
"spikes", spikes,
"hardness", hardness,
"aspect-ratio", aspect_ratio,
"angle", angle,
NULL);
GIMP_BRUSH (brush)->spacing = 20;
return GIMP_DATA (brush);
}
GimpBrushGeneratedShape
gimp_brush_generated_set_shape (GimpBrushGenerated *brush,
GimpBrushGeneratedShape shape)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush),
GIMP_BRUSH_GENERATED_CIRCLE);
if (brush->shape != shape)
{
brush->shape = shape;
g_object_notify (G_OBJECT (brush), "shape");
gimp_data_dirty (GIMP_DATA (brush));
}
return brush->shape;
}
gfloat
gimp_brush_generated_set_radius (GimpBrushGenerated *brush,
gfloat radius)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
radius = CLAMP (radius, 0.0, 32767.0);
if (brush->radius != radius)
{
brush->radius = radius;
g_object_notify (G_OBJECT (brush), "radius");
gimp_data_dirty (GIMP_DATA (brush));
}
return brush->radius;
}
gint
gimp_brush_generated_set_spikes (GimpBrushGenerated *brush,
gint spikes)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1);
spikes = CLAMP (spikes, 2, 20);
if (brush->spikes != spikes)
{
brush->spikes = spikes;
g_object_notify (G_OBJECT (brush), "spikes");
gimp_data_dirty (GIMP_DATA (brush));
}
return brush->spikes;
}
gfloat
gimp_brush_generated_set_hardness (GimpBrushGenerated *brush,
gfloat hardness)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
hardness = CLAMP (hardness, 0.0, 1.0);
if (brush->hardness != hardness)
{
brush->hardness = hardness;
g_object_notify (G_OBJECT (brush), "hardness");
gimp_data_dirty (GIMP_DATA (brush));
}
return brush->hardness;
}
gfloat
gimp_brush_generated_set_aspect_ratio (GimpBrushGenerated *brush,
gfloat ratio)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
ratio = CLAMP (ratio, 1.0, 1000.0);
if (brush->aspect_ratio != ratio)
{
brush->aspect_ratio = ratio;
g_object_notify (G_OBJECT (brush), "aspect-ratio");
gimp_data_dirty (GIMP_DATA (brush));
}
return brush->aspect_ratio;
}
gfloat
gimp_brush_generated_set_angle (GimpBrushGenerated *brush,
gfloat angle)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
if (angle < 0.0)
angle = -1.0 * fmod (angle, 180.0);
else if (angle > 180.0)
angle = fmod (angle, 180.0);
if (brush->angle != angle)
{
brush->angle = angle;
g_object_notify (G_OBJECT (brush), "angle");
gimp_data_dirty (GIMP_DATA (brush));
}
return brush->angle;
}
GimpBrushGeneratedShape
gimp_brush_generated_get_shape (const GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush),
GIMP_BRUSH_GENERATED_CIRCLE);
return brush->shape;
}
gfloat
gimp_brush_generated_get_radius (const GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->radius;
}
gint
gimp_brush_generated_get_spikes (const GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1);
return brush->spikes;
}
gfloat
gimp_brush_generated_get_hardness (const GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->hardness;
}
gfloat
gimp_brush_generated_get_aspect_ratio (const GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->aspect_ratio;
}
gfloat
gimp_brush_generated_get_angle (const GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->angle;
}
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