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gimp/app/core/gimpbrushgenerated.c
Michael Natterer 28e1a379e6 app: remove const qualifiers from all object parameters 
They are unreliable because every type checking cast discards them,
they are useless anyway, visual clutter, added inconsistently, and
generally suck. Wanted to do this a long time ago, it was a bad idea
in the first place.
2016-05-19 23:54:14 +02:00

853 lines
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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 <http://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 GimpData * gimp_brush_generated_duplicate (GimpData *data);
static void gimp_brush_generated_transform_size(GimpBrush *gbrush,
gdouble scale,
gdouble aspect_ratio,
gdouble angle,
gint *width,
gint *height);
static GimpTempBuf * gimp_brush_generated_transform_mask(GimpBrush *gbrush,
gdouble scale,
gdouble aspect_ratio,
gdouble angle,
gdouble hardness);
static GimpTempBuf * gimp_brush_generated_calc (GimpBrushGenerated *brush,
GimpBrushGeneratedShape shape,
gfloat radius,
gint spikes,
gfloat hardness,
gfloat aspect_ratio,
gfloat angle,
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,
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->duplicate = gimp_brush_generated_duplicate;
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);
if (gbrush->priv->mask)
gimp_temp_buf_unref (gbrush->priv->mask);
gbrush->priv->mask = gimp_brush_generated_calc (brush,
brush->shape,
brush->radius,
brush->spikes,
brush->hardness,
brush->aspect_ratio,
brush->angle,
&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 GimpData *
gimp_brush_generated_duplicate (GimpData *data)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (data);
return gimp_brush_generated_new (gimp_object_get_name (brush),
brush->shape,
brush->radius,
brush->spikes,
brush->hardness,
brush->aspect_ratio,
brush->angle);
}
static void
gimp_brush_generated_transform_size (GimpBrush *gbrush,
gdouble scale,
gdouble aspect_ratio,
gdouble angle,
gint *width,
gint *height)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (gbrush);
gdouble ratio;
if (aspect_ratio == 0.0)
{
ratio = brush->aspect_ratio;
}
else
{
ratio = MIN (fabs (aspect_ratio) + 1, 20);
/* Since generated brushes are symmetric the dont have input
* for aspect ratios < 1.0. its same as rotate by 90 degrees and
* 1 / ratio. So we fix the input up for this case. */
if (aspect_ratio < 0.0)
{
angle = angle + 0.25;
}
}
gimp_brush_generated_get_size (brush,
brush->shape,
brush->radius * scale,
brush->spikes,
brush->hardness,
ratio,
(brush->angle + 360 * angle),
width, height,
NULL, NULL, NULL, NULL);
}
static GimpTempBuf *
gimp_brush_generated_transform_mask (GimpBrush *gbrush,
gdouble scale,
gdouble aspect_ratio,
gdouble angle,
gdouble hardness)
{
GimpBrushGenerated *brush = GIMP_BRUSH_GENERATED (gbrush);
gdouble ratio;
if (aspect_ratio == 0.0)
{
ratio = brush->aspect_ratio;
}
else
{
ratio = MIN (fabs (aspect_ratio) + 1, 20);
/* Since generated brushes are symmetric the dont have input
* for aspect ratios < 1.0. its same as rotate by 90 degrees and
* 1 / ratio. So we fix the input up for this case. */
if (aspect_ratio < 0.0)
{
angle = angle + 0.25;
}
}
return gimp_brush_generated_calc (brush,
brush->shape,
brush->radius * scale,
brush->spikes,
hardness,
ratio,
(brush->angle + 360 * angle),
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 guchar *
gimp_brush_generated_calc_lut (gdouble radius,
gdouble hardness)
{
guchar *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 = g_malloc (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++] = RINT (sum * (255.0 / OVERSAMPLING));
}
while (x < length)
{
lookup[x++] = 0;
}
return lookup;
}
static GimpTempBuf *
gimp_brush_generated_calc (GimpBrushGenerated *brush,
GimpBrushGeneratedShape shape,
gfloat radius,
gint spikes,
gfloat hardness,
gfloat aspect_ratio,
gfloat angle,
GimpVector2 *xaxis,
GimpVector2 *yaxis)
{
guchar *centerp;
guchar *lookup;
guchar 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,
&width, &height,
&s, &c, &x_axis, &y_axis);
mask = gimp_temp_buf_new (width, height,
babl_format ("Y u8"));
half_width = width / 2;
half_height = height / 2;
centerp = 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;
centerp[y * width + x] = a;
if (spikes % 2 == 0)
centerp[-1 * y * width - x] = a;
}
}
g_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,
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 = ROUND (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));
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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