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gimp/app/core/gimpbrushgenerated-load.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 <errno.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <glib-object.h>
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "base/temp-buf.h"
#include "gimpbrushgenerated.h"
#include "gimp-intl.h"
#define OVERSAMPLING 5
/* local function prototypes */
static void gimp_brush_generated_class_init (GimpBrushGeneratedClass *klass);
static void gimp_brush_generated_init (GimpBrushGenerated *brush);
static gboolean gimp_brush_generated_save (GimpData *data,
GError **error);
static void gimp_brush_generated_dirty (GimpData *data);
static gchar * gimp_brush_generated_get_extension (GimpData *data);
static GimpData * gimp_brush_generated_duplicate (GimpData *data,
gboolean stingy_memory_use);
static GimpBrushClass *parent_class = NULL;
GType
gimp_brush_generated_get_type (void)
{
static GType brush_type = 0;
if (! brush_type)
{
static const GTypeInfo brush_info =
{
sizeof (GimpBrushGeneratedClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_brush_generated_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpBrushGenerated),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_brush_generated_init,
};
brush_type = g_type_register_static (GIMP_TYPE_BRUSH,
"GimpBrushGenerated",
&brush_info, 0);
}
return brush_type;
}
static void
gimp_brush_generated_class_init (GimpBrushGeneratedClass *klass)
{
GimpDataClass *data_class;
data_class = GIMP_DATA_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
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;
}
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;
}
static gboolean
gimp_brush_generated_save (GimpData *data,
GError **error)
{
GimpBrushGenerated *brush;
FILE *fp;
gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
brush = GIMP_BRUSH_GENERATED (data);
/* we are (finaly) ready to try to save the generated brush file */
if ((fp = fopen (data->filename, "wb")) == NULL)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_OPEN,
_("Could not open '%s' for writing: %s"),
data->filename, g_strerror (errno));
return FALSE;
}
/* write magic header */
fprintf (fp, "GIMP-VBR\n");
/* write version */
fprintf (fp, "1.0\n");
/* write name */
fprintf (fp, "%.255s\n", GIMP_OBJECT (brush)->name);
/* write brush spacing */
fprintf (fp, "%s\n",
g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f",
GIMP_BRUSH (brush)->spacing));
/* write brush radius */
fprintf (fp, "%s\n",
g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f",
brush->radius));
/* write brush hardness */
fprintf (fp, "%s\n",
g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f",
brush->hardness));
/* write brush aspect_ratio */
fprintf (fp, "%s\n",
g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f",
brush->aspect_ratio));
/* write brush angle */
fprintf (fp, "%s\n",
g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f",
brush->angle));
fclose (fp);
return TRUE;
}
static gchar *
gimp_brush_generated_get_extension (GimpData *data)
{
return GIMP_BRUSH_GENERATED_FILE_EXTENSION;
}
static GimpData *
gimp_brush_generated_duplicate (GimpData *data,
gboolean stingy_memory_use)
{
GimpBrushGenerated *brush;
brush = GIMP_BRUSH_GENERATED (data);
return gimp_brush_generated_new (brush->radius,
brush->hardness,
brush->angle,
brush->aspect_ratio,
stingy_memory_use);
}
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);
}
static void
gimp_brush_generated_dirty (GimpData *data)
{
GimpBrushGenerated *brush;
GimpBrush *gbrush = NULL;
gint x, y;
guchar *centerp;
gdouble d;
gdouble exponent;
guchar a;
gint length;
gint width, height;
guchar *lookup;
gdouble sum;
gdouble c, s;
gdouble short_radius;
gdouble buffer[OVERSAMPLING];
brush = GIMP_BRUSH_GENERATED (data);
if (brush->freeze) /* if we are frozen defer rerendering till later */
return;
gbrush = GIMP_BRUSH (brush);
if (gbrush->mask)
temp_buf_free (gbrush->mask);
s = sin (gimp_deg_to_rad (brush->angle));
c = cos (gimp_deg_to_rad (brush->angle));
short_radius = brush->radius / brush->aspect_ratio;
gbrush->x_axis.x = c * brush->radius;
gbrush->x_axis.y = -1.0 * s * brush->radius;
gbrush->y_axis.x = s * short_radius;
gbrush->y_axis.y = c * short_radius;
width = ceil (sqrt (gbrush->x_axis.x * gbrush->x_axis.x +
gbrush->y_axis.x * gbrush->y_axis.x));
height = ceil (sqrt (gbrush->x_axis.y * gbrush->x_axis.y +
gbrush->y_axis.y * gbrush->y_axis.y));
gbrush->mask = temp_buf_new (width * 2 + 1,
height * 2 + 1,
1, width, height, 0);
centerp = temp_buf_data (gbrush->mask) + height * gbrush->mask->width + width;
/* set up lookup table */
length = OVERSAMPLING * ceil (1 + sqrt (2 *
ceil (brush->radius + 1.0) *
ceil (brush->radius + 1.0)));
if ((1.0 - brush->hardness) < 0.000001)
exponent = 1000000.0;
else
exponent = 1.0 / (1.0 - brush->hardness);
lookup = g_malloc (length);
sum = 0.0;
for (x = 0; x < OVERSAMPLING; x++)
{
d = fabs ((x + 0.5) / OVERSAMPLING - 0.5);
if (d > brush->radius)
buffer[x] = 0.0;
else
buffer[x] = gauss (pow (d / brush->radius, exponent));
sum += buffer[x];
}
for (x = 0; d < brush->radius || sum > 0.00001; d += 1.0 / OVERSAMPLING)
{
sum -= buffer[x % OVERSAMPLING];
if (d > brush->radius)
buffer[x % OVERSAMPLING] = 0.0;
else
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++)
{
gdouble tx, ty;
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[(gint) RINT (d * OVERSAMPLING)];
else
a = 0;
centerp[ y * gbrush->mask->width + x] = a;
centerp[-1 * y * gbrush->mask->width - x] = a;
}
}
g_free (lookup);
if (GIMP_DATA_CLASS (parent_class)->dirty)
GIMP_DATA_CLASS (parent_class)->dirty (data);
}
GimpData *
gimp_brush_generated_new (gfloat radius,
gfloat hardness,
gfloat angle,
gfloat aspect_ratio,
gboolean stingy_memory_use)
{
GimpBrushGenerated *brush;
/* set up normal brush data */
brush = g_object_new (GIMP_TYPE_BRUSH_GENERATED, NULL);
gimp_object_set_name (GIMP_OBJECT (brush), "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_data_dirty (GIMP_DATA (brush));
if (stingy_memory_use)
temp_buf_swap (GIMP_BRUSH (brush)->mask);
return GIMP_DATA (brush);
}
GimpData *
gimp_brush_generated_load (const gchar *filename,
gboolean stingy_memory_use,
GError **error)
{
GimpBrushGenerated *brush;
FILE *fp;
gchar string[256];
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
if ((fp = fopen (filename, "rb")) == NULL)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_OPEN,
_("Could not open '%s' for reading: %s"),
filename, g_strerror (errno));
return NULL;
}
/* make sure the file we are reading is the right type */
fgets (string, 255, fp);
if (strncmp (string, "GIMP-VBR", 8) != 0)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file '%s': "
"Not a GIMP brush file."),
filename);
return NULL;
}
/* make sure we are reading a compatible version */
fgets (string, 255, fp);
if (strncmp (string, "1.0", 3))
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file '%s': "
"Unknown GIMP brush version."),
filename);
return NULL;
}
/* create new brush */
brush = g_object_new (GIMP_TYPE_BRUSH_GENERATED, NULL);
gimp_data_set_filename (GIMP_DATA (brush), filename);
gimp_brush_generated_freeze (brush);
/* read name */
fgets (string, 255, fp);
if (string[strlen (string) - 1] == '\n')
string[strlen (string) - 1] = 0;
gimp_object_set_name (GIMP_OBJECT (brush), string);
/* read brush spacing */
fgets (string, 255, fp);
GIMP_BRUSH (brush)->spacing = g_ascii_strtod (string, NULL);
/* read brush radius */
fgets (string, 255, fp);
gimp_brush_generated_set_radius (brush, g_ascii_strtod (string, NULL));
/* read brush hardness */
fgets (string, 255, fp);
gimp_brush_generated_set_hardness (brush, g_ascii_strtod (string, NULL));
/* read brush aspect_ratio */
fgets (string, 255, fp);
gimp_brush_generated_set_aspect_ratio (brush, g_ascii_strtod (string, NULL));
/* read brush angle */
fgets (string, 255, fp);
gimp_brush_generated_set_angle (brush, g_ascii_strtod (string, NULL));
fclose (fp);
gimp_brush_generated_thaw (brush);
if (stingy_memory_use)
temp_buf_swap (GIMP_BRUSH (brush)->mask);
GIMP_DATA (brush)->dirty = FALSE;
return GIMP_DATA (brush);
}
void
gimp_brush_generated_freeze (GimpBrushGenerated *brush)
{
g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush));
brush->freeze++;
}
void
gimp_brush_generated_thaw (GimpBrushGenerated *brush)
{
g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush));
if (brush->freeze > 0)
brush->freeze--;
if (!brush->freeze)
gimp_data_dirty (GIMP_DATA (brush));
}
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_data_dirty (GIMP_DATA (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_data_dirty (GIMP_DATA (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_data_dirty (GIMP_DATA (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_data_dirty (GIMP_DATA (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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