mirror of https://github.com/GNOME/gimp.git
280 lines
7.4 KiB
C
280 lines
7.4 KiB
C
/* 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 "appenv.h"
|
|
#include "gimpbrushgenerated.h"
|
|
#include "gimpbrushlist.h"
|
|
#include "paint_core.h"
|
|
#include <math.h>
|
|
|
|
#define OVERSAMPLING 5
|
|
|
|
static GimpObjectClass* parent_class;
|
|
|
|
static void
|
|
gimp_brush_generated_destroy(GtkObject *object)
|
|
{
|
|
GTK_OBJECT_CLASS(parent_class)->destroy (object);
|
|
}
|
|
|
|
static void
|
|
gimp_brush_generated_class_init (GimpBrushGeneratedClass *klass)
|
|
{
|
|
GtkObjectClass *object_class;
|
|
|
|
object_class = GTK_OBJECT_CLASS(klass);
|
|
|
|
parent_class = gtk_type_class (GIMP_TYPE_BRUSH);
|
|
object_class->destroy = gimp_brush_generated_destroy;
|
|
}
|
|
|
|
|
|
void
|
|
gimp_brush_generated_init(GimpBrushGenerated *brush)
|
|
{
|
|
brush->radius = 5.0;
|
|
brush->hardness = 0.0;
|
|
brush->angle = 0.0;
|
|
brush->aspect_ratio = 1.0;
|
|
}
|
|
|
|
guint gimp_brush_generated_get_type(void)
|
|
{
|
|
static GtkType type;
|
|
if(!type){
|
|
GtkTypeInfo info={
|
|
"GimpBrushGenerated",
|
|
sizeof(GimpBrushGenerated),
|
|
sizeof(GimpBrushGeneratedClass),
|
|
(GtkClassInitFunc)gimp_brush_generated_class_init,
|
|
(GtkObjectInitFunc)gimp_brush_generated_init,
|
|
NULL,
|
|
NULL };
|
|
type=gtk_type_unique(GIMP_TYPE_BRUSH, &info);
|
|
}
|
|
return type;
|
|
}
|
|
|
|
GimpBrushGenerated *gimp_brush_generated_new(float radius, float hardness,
|
|
float angle, float aspect_ratio)
|
|
{
|
|
GimpBrushGenerated *brush;
|
|
|
|
/* set up normal brush data */
|
|
brush = GIMP_BRUSH_GENERATED(gimp_type_new(gimp_brush_generated_get_type ()));
|
|
|
|
GIMP_BRUSH(brush)->name = g_strdup ("AAAGenerated");
|
|
GIMP_BRUSH(brush)->spacing = 20;
|
|
|
|
/* set up gimp_brush_generated data */
|
|
brush->radius = radius;
|
|
brush->hardness = hardness;
|
|
brush->angle = angle;
|
|
brush->aspect_ratio = aspect_ratio;
|
|
|
|
/* render brush mask */
|
|
gimp_brush_generated_generate(brush);
|
|
|
|
/* add brush to brush list */
|
|
/* FIXME: Get rid of this */
|
|
gimp_brush_list_add(brush_list, GIMP_BRUSH(brush));
|
|
select_brush(GIMP_BRUSH(brush));
|
|
|
|
return brush;
|
|
}
|
|
|
|
void
|
|
gimp_brush_generated_generate(GimpBrushGenerated *brush)
|
|
{
|
|
register GimpBrush *gbrush = NULL;
|
|
register int x, y;
|
|
register guchar *centerp;
|
|
register double d;
|
|
register double exponent;
|
|
register guchar a;
|
|
register int length;
|
|
register char *lookup;
|
|
double buffer[OVERSAMPLING];
|
|
register double sum, c, s, tx, ty;
|
|
int width, height;
|
|
if (!GIMP_IS_BRUSH_GENERATED(brush))
|
|
{
|
|
g_message("call to gimp_brush_generated_generate on non generated brush");
|
|
return;
|
|
}
|
|
gbrush = GIMP_BRUSH(brush);
|
|
if (gbrush->mask)
|
|
{
|
|
temp_buf_free(gbrush->mask);
|
|
}
|
|
#define D_TO_R M_PI/180
|
|
/* compute the range of the brush, should do a better job than this */
|
|
s = sin(brush->angle*M_PI/180);
|
|
c = cos(brush->angle*M_PI/180);
|
|
tx = MAXIMUM(fabs(c*ceil(brush->radius) - s*ceil(brush->radius)
|
|
/brush->aspect_ratio),
|
|
fabs(c*ceil(brush->radius) + s*ceil(brush->radius)
|
|
/brush->aspect_ratio));
|
|
ty = MAXIMUM(fabs(s*ceil(brush->radius) + c*ceil(brush->radius)
|
|
/brush->aspect_ratio),
|
|
fabs(s*ceil(brush->radius) - c*ceil(brush->radius)
|
|
/brush->aspect_ratio));
|
|
if (brush->radius > tx)
|
|
width = ceil(tx);
|
|
else
|
|
width = ceil(brush->radius+1);
|
|
if (brush->radius > ty)
|
|
height = ceil(ty);
|
|
else
|
|
height = ceil(brush->radius);
|
|
|
|
gbrush->mask = temp_buf_new(width*2 + 1,
|
|
height*2 + 1,
|
|
1, width, height, 0);
|
|
centerp = &gbrush->mask->data[height*gbrush->mask->width + width];
|
|
if ((1.0 - brush->hardness) < 0.000001)
|
|
exponent = 1000000;
|
|
else
|
|
exponent = 1/(1.0 - brush->hardness);
|
|
/* set up lookup table */
|
|
length = ceil(sqrt(2*ceil(brush->radius+1)*ceil(brush->radius+1))+1) * OVERSAMPLING;
|
|
lookup = g_malloc(length);
|
|
sum = 0.0;
|
|
for (x = 0; x < OVERSAMPLING; x++)
|
|
{
|
|
d = fabs((x+.5)/OVERSAMPLING - .5);
|
|
if (d > brush->radius)
|
|
buffer[x] = 0.0;
|
|
else
|
|
buffer[x] = (1.0 - pow(d/brush->radius, exponent));
|
|
sum += buffer[x];
|
|
}
|
|
for (x = 0; d < brush->radius || sum > .00001; d += 1.0/OVERSAMPLING)
|
|
{
|
|
sum -= buffer[x%OVERSAMPLING];
|
|
if (d > brush->radius)
|
|
buffer[x%OVERSAMPLING] = 0.0;
|
|
else
|
|
buffer[x%OVERSAMPLING] = (1.0 - pow(d/brush->radius, exponent));
|
|
sum += buffer[x%OVERSAMPLING];
|
|
lookup[x++] = rint(sum*(255.0/OVERSAMPLING));
|
|
}
|
|
while (x < length)
|
|
{
|
|
lookup[x++] = 0;
|
|
}
|
|
/* compute one half and mirror it */
|
|
for (y = 0; y <= height; y++)
|
|
{
|
|
for (x = -width; x <= width; x++)
|
|
{
|
|
tx = c*x - s*y;
|
|
ty = c*y + s*x;
|
|
ty *= brush->aspect_ratio;
|
|
d = sqrt(tx*tx + ty*ty);
|
|
if (d < brush->radius+1)
|
|
a = lookup[(int)rint(d*OVERSAMPLING)];
|
|
else
|
|
a = 0;
|
|
centerp[ y*gbrush->mask->width + x] = a;
|
|
centerp[-1*y*gbrush->mask->width - x] = a;
|
|
}
|
|
}
|
|
g_free (lookup);
|
|
gtk_signal_emit_by_name(GTK_OBJECT(brush), "dirty");
|
|
/* brush_changed_notify(GIMP_BRUSH(brush)); */
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_set_radius (GimpBrushGenerated* brush, float radius)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
if (radius < 0.0)
|
|
radius = 0.0;
|
|
else if(radius > 32767.0)
|
|
radius = 32767.0;
|
|
brush->radius = radius;
|
|
return brush->radius;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_set_hardness (GimpBrushGenerated* brush, float hardness)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
if (hardness < 0.0)
|
|
hardness = 0.0;
|
|
else if(hardness > 1.0)
|
|
hardness = 1.0;
|
|
brush->hardness = hardness;
|
|
return brush->hardness;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_set_angle (GimpBrushGenerated* brush, float 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);
|
|
brush->angle = angle;
|
|
return brush->angle;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_set_aspect_ratio (GimpBrushGenerated* brush, float ratio)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
if (ratio < 1.0)
|
|
ratio = 1.0;
|
|
else if(ratio > 1000)
|
|
ratio = 1000;
|
|
brush->aspect_ratio = ratio;
|
|
return brush->aspect_ratio;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_get_radius (GimpBrushGenerated* brush)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
return brush->radius;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_get_hardness (GimpBrushGenerated* brush)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
return brush->hardness;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_get_angle (GimpBrushGenerated* brush)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
return brush->angle;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_get_aspect_ratio (GimpBrushGenerated* brush)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
return brush->aspect_ratio;
|
|
}
|