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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 "appenv.h"
#include "gimpbrushgenerated.h"
#include "paint_core.h"
#include "gimprc.h"
#include <math.h>
#include <stdio.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;
}
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;
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);
return brush;
}
GimpBrushGenerated *
gimp_brush_generated_load (char *file_name)
{
GimpBrushGenerated *brush;
FILE *fp;
char string[256];
float fl;
float version;
if ((fp = fopen(file_name, "rb")) == NULL)
return NULL;
/* make sure the file we are reading is the right type */
fscanf(fp, "%8s", string);
g_return_val_if_fail(strcmp(string, "GIMP-VBR") == 0, NULL);
/* make sure we are reading a compatible version */
fscanf(fp, "%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 */
fscanf(fp, "%255s", string);
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,
char *file_name)
{
/* WARNING: untested function */
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, "%s", GIMP_BRUSH(brush)->name);
/* write brush spacing */
fprintf(fp, "%f", (float)GIMP_BRUSH(brush)->spacing);
/* write brush radius */
fprintf(fp, "%f", brush->radius);
/* write brush hardness */
fprintf(fp, "%f", brush->hardness);
/* write brush aspect_ratio */
fprintf(fp, "%f", brush->aspect_ratio);
/* write brush angle */
fprintf(fp, "%f", brush->angle);
fclose(fp);
}
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(double 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 char *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*M_PI/180.0);
c = cos(brush->angle*M_PI/180.0);
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);
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");
/* 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;
if (radius == brush->radius)
return radius;
brush->radius = radius;
if (!brush->freeze)
gimp_brush_generated_generate(brush);
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;
if (brush->hardness == hardness)
return hardness;
brush->hardness = hardness;
if (!brush->freeze)
gimp_brush_generated_generate(brush);
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);
if (brush->angle == angle)
return angle;
brush->angle = angle;
if (!brush->freeze)
gimp_brush_generated_generate(brush);
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;
if (brush->aspect_ratio == ratio)
return ratio;
brush->aspect_ratio = ratio;
if (!brush->freeze)
gimp_brush_generated_generate(brush);
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;
}
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