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gimp/app/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 <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "appenv.h"
#include "gimpbrushgenerated.h"
#include "paint_core.h"
#include "gimprc.h"
#include "gimpbrush.h"
#include "libgimp/gimpmath.h"
#define OVERSAMPLING 5
static void gimp_brush_generated_generate (GimpBrushGenerated *brush);
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;
}
static void
gimp_brush_generated_init (GimpBrushGenerated *brush)
{
brush->radius = 5.0;
brush->hardness = 0.0;
brush->angle = 0.0;
brush->aspect_ratio = 1.0;
brush->freeze = 0;
}
guint
gimp_brush_generated_get_type (void)
{
static GtkType type = 0;
if (!type)
{
GtkTypeInfo info =
{
"GimpBrushGenerated",
sizeof (GimpBrushGenerated),
sizeof (GimpBrushGeneratedClass),
(GtkClassInitFunc) gimp_brush_generated_class_init,
(GtkObjectInitFunc) gimp_brush_generated_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL
};
type = gtk_type_unique(GIMP_TYPE_BRUSH, &info);
}
return type;
}
GimpBrushGenerated *
gimp_brush_generated_new (gfloat radius,
gfloat hardness,
gfloat angle,
gfloat 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 ("Untitled");
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);
return brush;
}
GimpBrushGenerated *
gimp_brush_generated_load (const gchar *file_name)
{
GimpBrushGenerated *brush;
FILE *fp;
gchar string[256];
gfloat fl;
gfloat version;
if ((fp = fopen(file_name, "rb")) == NULL)
return NULL;
/* make sure the file we are reading is the right type */
fgets (string, 255, fp);
g_return_val_if_fail (strncmp (string, "GIMP-VBR", 8) == 0, NULL);
/* make sure we are reading a compatible version */
fgets (string, 255, fp);
sscanf (string, "%f", &version);
g_return_val_if_fail (version < 2.0, NULL);
/* create new brush */
brush =
GIMP_BRUSH_GENERATED (gimp_type_new (gimp_brush_generated_get_type ()));
GIMP_BRUSH (brush)->filename = g_strdup (file_name);
gimp_brush_generated_freeze (brush);
/* read name */
fgets (string, 255, fp);
if (string[strlen (string)-1] == '\n')
string[strlen (string)-1] = 0;
GIMP_BRUSH (brush)->name = g_strdup (string);
/* read brush spacing */
fscanf (fp, "%f", &fl);
GIMP_BRUSH (brush)->spacing = fl;
/* read brush radius */
fscanf (fp, "%f", &fl);
gimp_brush_generated_set_radius (brush, fl);
/* read brush hardness */
fscanf (fp, "%f", &fl);
gimp_brush_generated_set_hardness (brush, fl);
/* read brush aspect_ratio */
fscanf (fp, "%f", &fl);
gimp_brush_generated_set_aspect_ratio (brush, fl);
/* read brush angle */
fscanf (fp, "%f", &fl);
gimp_brush_generated_set_angle (brush, fl);
fclose (fp);
gimp_brush_generated_thaw (brush);
if (stingy_memory_use)
temp_buf_swap (GIMP_BRUSH (brush)->mask);
return brush;
}
void
gimp_brush_generated_save (GimpBrushGenerated *brush,
const gchar *file_name)
{
FILE *fp;
if ((fp = fopen (file_name, "wb")) == NULL)
{
g_warning("Unable to save file %s", file_name);
return;
}
/* write magic header */
fprintf (fp, "GIMP-VBR\n");
/* write version */
fprintf (fp, "1.0\n");
/* write name */
fprintf (fp, "%.255s\n", GIMP_BRUSH (brush)->name);
/* write brush spacing */
fprintf (fp, "%f\n", (float) GIMP_BRUSH (brush)->spacing);
/* write brush radius */
fprintf (fp, "%f\n", brush->radius);
/* write brush hardness */
fprintf (fp, "%f\n", brush->hardness);
/* write brush aspect_ratio */
fprintf (fp, "%f\n", brush->aspect_ratio);
/* write brush angle */
fprintf (fp, "%f\n", brush->angle);
fclose (fp);
}
void
gimp_brush_generated_delete (GimpBrushGenerated *brush)
{
if (GIMP_BRUSH (brush)->filename)
{
unlink (GIMP_BRUSH (brush)->filename);
}
}
void
gimp_brush_generated_freeze (GimpBrushGenerated *brush)
{
g_return_if_fail (brush != NULL);
g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush));
brush->freeze++;
}
void
gimp_brush_generated_thaw (GimpBrushGenerated *brush)
{
g_return_if_fail (brush != NULL);
g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush));
if (brush->freeze > 0)
brush->freeze--;
if (brush->freeze == 0)
gimp_brush_generated_generate (brush);
}
static double
gauss (gdouble f)
{
/* this aint' a real gauss function */
if (f < -.5)
{
f = -1.0-f;
return (2.0*f*f);
}
if (f < .5)
return (1.0-2.0*f*f);
f = 1.0 -f;
return (2.0*f*f);
}
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 guchar *lookup;
double buffer[OVERSAMPLING];
register double sum, c, s, tx, ty;
int width, height;
g_return_if_fail (brush != NULL);
g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush));
if (brush->freeze) /* if we are frozen defer rerendering till later */
return;
gbrush = GIMP_BRUSH (brush);
if (stingy_memory_use && gbrush->mask)
temp_buf_unswap (gbrush->mask);
if (gbrush->mask)
{
temp_buf_free(gbrush->mask);
}
/* compute the range of the brush. should do a better job than this? */
s = sin (brush->angle*G_PI/180.0);
c = cos (brush->angle*G_PI/180.0);
tx = MAX (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 = MAX (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);
if (brush->radius > ty)
height = ceil (ty);
else
height = ceil (brush->radius);
/* compute the axis for spacing */
GIMP_BRUSH (brush)->x_axis.x = c*brush->radius;
GIMP_BRUSH (brush)->x_axis.y = -1.0*s*brush->radius;
GIMP_BRUSH (brush)->y_axis.x = (s*brush->radius / brush->aspect_ratio);
GIMP_BRUSH (brush)->y_axis.y = (c*brush->radius / brush->aspect_ratio);
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)); */
buffer[x] = gauss (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)); */
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;
}
/* 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");
}
gfloat
gimp_brush_generated_set_radius (GimpBrushGenerated *brush,
gfloat 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;
if (radius == brush->radius)
return radius;
brush->radius = radius;
if (!brush->freeze)
gimp_brush_generated_generate (brush);
return brush->radius;
}
gfloat
gimp_brush_generated_set_hardness (GimpBrushGenerated *brush,
gfloat 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;
if (brush->hardness == hardness)
return hardness;
brush->hardness = hardness;
if (!brush->freeze)
gimp_brush_generated_generate (brush);
return brush->hardness;
}
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)
return angle;
brush->angle = angle;
if (!brush->freeze)
gimp_brush_generated_generate (brush);
return brush->angle;
}
gfloat
gimp_brush_generated_set_aspect_ratio (GimpBrushGenerated *brush,
gfloat 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;
if (brush->aspect_ratio == ratio)
return ratio;
brush->aspect_ratio = ratio;
if (!brush->freeze)
gimp_brush_generated_generate(brush);
return brush->aspect_ratio;
}
gfloat
gimp_brush_generated_get_radius (const GimpBrushGenerated *brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->radius;
}
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_angle (const GimpBrushGenerated* brush)
{
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0);
return brush->angle;
}
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;
}
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