mirror of https://github.com/GNOME/gimp.git
432 lines
11 KiB
C
432 lines
11 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 "config.h"
|
|
|
|
#include <math.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "appenv.h"
|
|
#include "gimpbrushgenerated.h"
|
|
#include "paint_core.h"
|
|
#include "gimprc.h"
|
|
#include "gimpbrush.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=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(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 (const 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,
|
|
const 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 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 = 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 (const GimpBrushGenerated* brush)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
return brush->radius;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_get_hardness (const GimpBrushGenerated* brush)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
return brush->hardness;
|
|
}
|
|
|
|
float
|
|
gimp_brush_generated_get_angle (const GimpBrushGenerated* brush)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
|
|
return brush->angle;
|
|
}
|
|
|
|
float
|
|
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;
|
|
}
|