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gimp/app/core/gimpbrushgenerated.c

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/* GIMP - The GNU 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 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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "gimpbrush-private.h"
#include "gimpbrushgenerated.h"
#include "gimpbrushgenerated-load.h"
#include "gimpbrushgenerated-save.h"
#include "gimptempbuf.h"
#include "gimp-intl.h"
#define OVERSAMPLING 4
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 const gchar * gimp_brush_generated_get_extension (GimpData *data);
static void gimp_brush_generated_copy (GimpData *data,
GimpData *src_data);
static void gimp_brush_generated_transform_size(GimpBrush *gbrush,
gdouble scale,
gdouble aspect_ratio,
gdouble angle,
gboolean reflect,
gint *width,
gint *height);
static GimpTempBuf * gimp_brush_generated_transform_mask(GimpBrush *gbrush,
gdouble scale,
gdouble aspect_ratio,
gdouble angle,
gboolean reflect,
gdouble hardness);
static GimpTempBuf * gimp_brush_generated_calc (GimpBrushGenerated *brush,
GimpBrushGeneratedShape shape,
gfloat radius,
gint spikes,
gfloat hardness,
gfloat aspect_ratio,
gfloat angle,
gboolean reflect,
GimpVector2 *xaxis,
GimpVector2 *yaxis);
static void gimp_brush_generated_get_size (GimpBrushGenerated *gbrush,
GimpBrushGeneratedShape shape,
gfloat radius,
gint spikes,
gfloat hardness,
gfloat aspect_ratio,
gdouble angle_in_degrees,
gboolean reflect,
gint *width,
gint *height,
gdouble *_s,
gdouble *_c,
GimpVector2 *_x_axis,
GimpVector2 *_y_axis);
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);
GimpBrushClass *brush_class = GIMP_BRUSH_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->copy = gimp_brush_generated_copy;
brush_class->transform_size = gimp_brush_generated_transform_size;
brush_class->transform_mask = gimp_brush_generated_transform_mask;
g_object_class_install_property (object_class, PROP_SHAPE,
g_param_spec_enum ("shape", NULL,
_("Brush Shape"),
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,
_("Brush Radius"),
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,
_("Brush Spikes"),
2, 20, 2,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_HARDNESS,
g_param_spec_double ("hardness", NULL,
_("Brush Hardness"),
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,
_("Brush Aspect Ratio"),
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,
_("Brush Angle"),
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 void
gimp_brush_generated_dirty (GimpData *data)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (data);
GimpBrush *gbrush = GIMP_BRUSH (brush);
g_clear_pointer (&gbrush->priv->mask, gimp_temp_buf_unref);
gbrush->priv->mask = gimp_brush_generated_calc (brush,
brush->shape,
brush->radius,
brush->spikes,
brush->hardness,
brush->aspect_ratio,
brush->angle,
FALSE,
&gbrush->priv->x_axis,
&gbrush->priv->y_axis);
GIMP_DATA_CLASS (parent_class)->dirty (data);
}
static const gchar *
gimp_brush_generated_get_extension (GimpData *data)
{
return GIMP_BRUSH_GENERATED_FILE_EXTENSION;
}
static void
gimp_brush_generated_copy (GimpData *data,
GimpData *src_data)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (data);
GimpBrushGenerated *src_brush = GIMP_BRUSH_GENERATED (src_data);
gimp_data_freeze (data);
gimp_brush_set_spacing (GIMP_BRUSH (brush),
gimp_brush_get_spacing (GIMP_BRUSH (src_brush)));
brush->shape = src_brush->shape;
brush->radius = src_brush->radius;
brush->spikes = src_brush->spikes;
brush->hardness = src_brush->hardness;
brush->aspect_ratio = src_brush->aspect_ratio;
brush->angle = src_brush->angle;
gimp_data_thaw (data);
}
static void
gimp_brush_generated_transform_size (GimpBrush *gbrush,
gdouble scale,
gdouble aspect_ratio,
gdouble angle,
gboolean reflect,
gint *width,
gint *height)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (gbrush);
gdouble ratio;
ratio = fabs (aspect_ratio) * 19.0 / 20.0 + 1.0;
ratio = MIN (ratio, 20);
/* Since generated brushes are symmetric they don't have aspect
* ratios < 1.0. it's the same as rotating by 90 degrees and 1 /
* ratio, so we fix the input for this case.
*/
if (aspect_ratio < 0.0)
angle = angle + 0.25;
angle = fmod (fmod (angle, 1.0) + 1.0, 1.0);
angle *= 360;
gimp_brush_generated_get_size (brush,
brush->shape,
brush->radius * scale,
brush->spikes,
brush->hardness,
ratio,
angle,
reflect,
width, height,
NULL, NULL, NULL, NULL);
}
static GimpTempBuf *
gimp_brush_generated_transform_mask (GimpBrush *gbrush,
gdouble scale,
gdouble aspect_ratio,
gdouble angle,
gboolean reflect,
gdouble hardness)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (gbrush);
gdouble ratio;
ratio = fabs (aspect_ratio) * 19.0 / 20.0 + 1.0;
ratio = MIN (ratio, 20);
/* Since generated brushes are symmetric they don't have aspect
* ratios < 1.0. it's the same as rotating by 90 degrees and 1 /
* ratio, so we fix the input for this case.
*/
if (aspect_ratio < 0.0)
angle = angle + 0.25;
angle = fmod (fmod (angle, 1.0) + 1.0, 1.0);
angle *= 360;
if (scale == 1.0 &&
ratio == brush->aspect_ratio &&
angle == brush->angle &&
reflect == FALSE &&
hardness == brush->hardness)
{
return gimp_temp_buf_copy (gimp_brush_get_mask (gbrush));
}
return gimp_brush_generated_calc (brush,
brush->shape,
brush->radius * scale,
brush->spikes,
hardness,
ratio,
angle,
reflect,
NULL, NULL);
}
/* the actual brush rendering functions */
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);
}
/* set up lookup table */
static gfloat *
gimp_brush_generated_calc_lut (gdouble radius,
gdouble hardness)
{
gfloat *lookup;
gint length;
gint x;
gdouble d;
gdouble sum;
gdouble exponent;
gdouble buffer[OVERSAMPLING];
length = OVERSAMPLING * ceil (1 + sqrt (2 * SQR (ceil (radius + 1.0))));
lookup = gegl_scratch_new (gfloat, length);
sum = 0.0;
if ((1.0 - hardness) < 0.0000004)
exponent = 1000000.0;
else
exponent = 0.4 / (1.0 - hardness);
for (x = 0; x < OVERSAMPLING; x++)
{
d = fabs ((x + 0.5) / OVERSAMPLING - 0.5);
if (d > radius)
buffer[x] = 0.0;
else
buffer[x] = gauss (pow (d / radius, exponent));
sum += buffer[x];
}
for (x = 0; d < radius || sum > 0.00001; d += 1.0 / OVERSAMPLING)
{
sum -= buffer[x % OVERSAMPLING];
if (d > radius)
buffer[x % OVERSAMPLING] = 0.0;
else
buffer[x % OVERSAMPLING] = gauss (pow (d / radius, exponent));
sum += buffer[x % OVERSAMPLING];
lookup[x++] = sum / OVERSAMPLING;
}
while (x < length)
{
lookup[x++] = 0.0f;
}
return lookup;
}
static GimpTempBuf *
gimp_brush_generated_calc (GimpBrushGenerated *brush,
GimpBrushGeneratedShape shape,
gfloat radius,
gint spikes,
gfloat hardness,
gfloat aspect_ratio,
gfloat angle,
gboolean reflect,
GimpVector2 *xaxis,
GimpVector2 *yaxis)
{
gfloat *centerp;
gfloat *lookup;
gfloat a;
gint x, y;
gdouble c, s, cs, ss;
GimpVector2 x_axis;
GimpVector2 y_axis;
GimpTempBuf *mask;
gint width;
gint height;
gint half_width;
gint half_height;
gimp_brush_generated_get_size (brush,
shape,
radius,
spikes,
hardness,
aspect_ratio,
angle,
reflect,
&width, &height,
&s, &c, &x_axis, &y_axis);
mask = gimp_temp_buf_new (width, height,
babl_format ("Y float"));
half_width = width / 2;
half_height = height / 2;
centerp = (gfloat *) gimp_temp_buf_get_data (mask) +
half_height * width + half_width;
lookup = gimp_brush_generated_calc_lut (radius, hardness);
cs = cos (- 2 * G_PI / spikes);
ss = sin (- 2 * G_PI / spikes);
/* for an even number of spikes compute one half and mirror it */
for (y = ((spikes % 2) ? -half_height : 0); y <= half_height; y++)
{
for (x = -half_width; x <= half_width; x++)
{
gdouble d = 0;
gdouble tx = c * x - s * y;
gdouble ty = fabs (s * x + c * y);
if (spikes > 2)
{
gdouble angle = atan2 (ty, tx);
while (angle > G_PI / spikes)
{
gdouble sx = tx;
gdouble sy = ty;
tx = cs * sx - ss * sy;
ty = ss * sx + cs * sy;
angle -= 2 * G_PI / spikes;
}
}
ty *= aspect_ratio;
switch (shape)
{
case GIMP_BRUSH_GENERATED_CIRCLE:
d = sqrt (SQR (tx) + SQR (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 < radius + 1)
a = lookup[(gint) RINT (d * OVERSAMPLING)];
else
a = 0.0f;
centerp[y * width + x] = a;
if (spikes % 2 == 0)
centerp[-1 * y * width - x] = a;
}
}
gegl_scratch_free (lookup);
if (xaxis)
*xaxis = x_axis;
if (yaxis)
*yaxis = y_axis;
return mask;
}
/* This function is shared between gimp_brush_generated_transform_size and
* gimp_brush_generated_calc, therefore we provide a bunch of optional
* pointers for returnvalues.
*/
static void
gimp_brush_generated_get_size (GimpBrushGenerated *gbrush,
GimpBrushGeneratedShape shape,
gfloat radius,
gint spikes,
gfloat hardness,
gfloat aspect_ratio,
gdouble angle_in_degrees,
gboolean reflect,
gint *width,
gint *height,
gdouble *_s,
gdouble *_c,
GimpVector2 *_x_axis,
GimpVector2 *_y_axis)
{
gdouble half_width = 0.0;
gdouble half_height = 0.0;
gint w, h;
gdouble c, s;
gdouble short_radius;
GimpVector2 x_axis;
GimpVector2 y_axis;
/* Since floatongpoint is not really accurate,
* we need to round to limit the errors.
* Errors in some border cases resulted in
* different height and width reported for
* the same input value on calling procedure side.
* This became problem at the rise of dynamics that
* allows for any angle to turn up.
**/
angle_in_degrees = RINT (angle_in_degrees * 1000.0) / 1000.0;
s = sin (gimp_deg_to_rad (angle_in_degrees));
c = cos (gimp_deg_to_rad (angle_in_degrees));
if (reflect)
c = -c;
short_radius = radius / aspect_ratio;
x_axis.x = c * radius;
x_axis.y = -1.0 * s * radius;
y_axis.x = s * short_radius;
y_axis.y = c * short_radius;
switch (shape)
{
case GIMP_BRUSH_GENERATED_CIRCLE:
half_width = sqrt (x_axis.x * x_axis.x + y_axis.x * y_axis.x);
half_height = sqrt (x_axis.y * x_axis.y + y_axis.y * y_axis.y);
break;
case GIMP_BRUSH_GENERATED_SQUARE:
half_width = fabs (x_axis.x) + fabs (y_axis.x);
half_height = fabs (x_axis.y) + fabs (y_axis.y);
break;
case GIMP_BRUSH_GENERATED_DIAMOND:
half_width = MAX (fabs (x_axis.x), fabs (y_axis.x));
half_height = MAX (fabs (x_axis.y), fabs (y_axis.y));
break;
}
if (spikes > 2)
{
/* could be optimized by respecting the angle */
half_width = half_height = sqrt (radius * radius +
short_radius * short_radius);
y_axis.x = s * radius;
y_axis.y = c * radius;
}
w = MAX (1, ceil (half_width * 2));
h = MAX (1, ceil (half_height * 2));
if (! (w & 0x1)) w++;
if (! (h & 0x1)) h++;
*width = w;
*height = h;
/* These will typically be set then this function is called by
* gimp_brush_generated_calc, which needs the values in its algorithms.
*/
if (_s != NULL)
*_s = s;
if (_c != NULL)
*_c = c;
if (_x_axis != NULL)
*_x_axis = x_axis;
if (_y_axis != NULL)
*_y_axis = y_axis;
}
/* public functions */
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",
"spacing", 20.0,
"shape", shape,
"radius", radius,
"spikes", spikes,
"hardness", hardness,
"aspect-ratio", aspect_ratio,
"angle", angle,
NULL);
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 (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 (GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->radius;
}
gint
gimp_brush_generated_get_spikes (GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1);
return brush->spikes;
}
gfloat
gimp_brush_generated_get_hardness (GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->hardness;
}
gfloat
gimp_brush_generated_get_aspect_ratio (GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->aspect_ratio;
}
gfloat
gimp_brush_generated_get_angle (GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->angle;
}
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