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gimp/app/core/gimpbrushpipe.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1999 Adrian Likins and Tor Lillqvist
*
* 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 <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#ifndef _O_BINARY
#define _O_BINARY 0
#endif
#include <glib-object.h>
#include <glib/gstdio.h>
#ifdef G_OS_WIN32
#include <io.h>
#endif
#include "libgimpbase/gimpbase.h"
#include "libgimpbase/gimpparasiteio.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "base/temp-buf.h"
#include "gimpbrush-load.h"
#include "gimpbrushpipe.h"
#include "gimp-intl.h"
static void gimp_brush_pipe_finalize (GObject *object);
static gint64 gimp_brush_pipe_get_memsize (GimpObject *object,
gint64 *gui_size);
static gboolean gimp_brush_pipe_get_popup_size (GimpViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height);
static GimpBrush * gimp_brush_pipe_select_brush (GimpBrush *brush,
GimpCoords *last_coords,
GimpCoords *cur_coords);
static gboolean gimp_brush_pipe_want_null_motion (GimpBrush *brush,
GimpCoords *last_coords,
GimpCoords *cur_coords);
G_DEFINE_TYPE (GimpBrushPipe, gimp_brush_pipe, GIMP_TYPE_BRUSH);
#define parent_class gimp_brush_pipe_parent_class
static void
gimp_brush_pipe_class_init (GimpBrushPipeClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
GimpBrushClass *brush_class = GIMP_BRUSH_CLASS (klass);
object_class->finalize = gimp_brush_pipe_finalize;
gimp_object_class->get_memsize = gimp_brush_pipe_get_memsize;
viewable_class->get_popup_size = gimp_brush_pipe_get_popup_size;
brush_class->select_brush = gimp_brush_pipe_select_brush;
brush_class->want_null_motion = gimp_brush_pipe_want_null_motion;
}
static void
gimp_brush_pipe_init (GimpBrushPipe *pipe)
{
pipe->current = NULL;
pipe->dimension = 0;
pipe->rank = NULL;
pipe->stride = NULL;
pipe->nbrushes = 0;
pipe->brushes = NULL;
pipe->select = NULL;
pipe->index = NULL;
}
static void
gimp_brush_pipe_finalize (GObject *object)
{
GimpBrushPipe *pipe = GIMP_BRUSH_PIPE (object);
if (pipe->rank)
{
g_free (pipe->rank);
pipe->rank = NULL;
}
if (pipe->stride)
{
g_free (pipe->stride);
pipe->stride = NULL;
}
if (pipe->brushes)
{
gint i;
for (i = 0; i < pipe->nbrushes; i++)
if (pipe->brushes[i])
g_object_unref (pipe->brushes[i]);
g_free (pipe->brushes);
pipe->brushes = NULL;
}
if (pipe->select)
{
g_free (pipe->select);
pipe->select = NULL;
}
if (pipe->index)
{
g_free (pipe->index);
pipe->index = NULL;
}
GIMP_BRUSH (pipe)->mask = NULL;
GIMP_BRUSH (pipe)->pixmap = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gint64
gimp_brush_pipe_get_memsize (GimpObject *object,
gint64 *gui_size)
{
GimpBrushPipe *pipe = GIMP_BRUSH_PIPE (object);
gint64 memsize = 0;
gint i;
memsize += pipe->dimension * (sizeof (gint) /* rank */ +
sizeof (gint) /* stride */ +
sizeof (PipeSelectModes));
for (i = 0; i < pipe->nbrushes; i++)
memsize += gimp_object_get_memsize (GIMP_OBJECT (pipe->brushes[i]),
gui_size);
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static gboolean
gimp_brush_pipe_get_popup_size (GimpViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height)
{
return gimp_viewable_get_size (viewable, popup_width, popup_height);
}
static GimpBrush *
gimp_brush_pipe_select_brush (GimpBrush *brush,
GimpCoords *last_coords,
GimpCoords *cur_coords)
{
GimpBrushPipe *pipe = GIMP_BRUSH_PIPE (brush);
gint i, brushix, ix;
gdouble angle, velocity, spacing;
if (pipe->nbrushes == 1)
return GIMP_BRUSH (pipe->current);
/* calculates brush native spacing in pixels, based on it's width)*/
spacing = ((gdouble) pipe->current->spacing / 100) *
MAX (brush->mask->width, brush->mask->height);
brushix = 0;
for (i = 0; i < pipe->dimension; i++)
{
switch (pipe->select[i])
{
case PIPE_SELECT_INCREMENTAL:
ix = (pipe->index[i] + 1) % pipe->rank[i];
break;
case PIPE_SELECT_ANGULAR:
angle = atan2 (cur_coords->y - last_coords->y,
cur_coords->x - last_coords->x);
/* Offset angle to be compatible with PSP tubes */
angle += G_PI_2;
/* Map it to the [0..2*G_PI) interval */
if (angle < 0)
angle += 2.0 * G_PI;
else if (angle > 2.0 * G_PI)
angle -= 2.0 * G_PI;
ix = RINT (angle / (2.0 * G_PI) * pipe->rank[i]);
break;
case PIPE_SELECT_VELOCITY:
velocity = sqrt (SQR (cur_coords->x - last_coords->x) +
SQR (cur_coords->y - last_coords->y));
/* I don't know how much velocity is enough velocity. I will assume 0 to
brush' saved spacing (converted to pixels) to be 'enough' velocity */
ix = ROUND ((1.0 - MIN (1.0, velocity / (spacing))) * pipe->rank[i]);
break;
case PIPE_SELECT_RANDOM:
/* This probably isn't the right way */
ix = g_random_int_range (0, pipe->rank[i]);
break;
case PIPE_SELECT_PRESSURE:
ix = RINT (cur_coords->pressure * (pipe->rank[i] - 1));
break;
case PIPE_SELECT_TILT_X:
ix = RINT (cur_coords->xtilt / 2.0 * pipe->rank[i]) + pipe->rank[i] / 2;
break;
case PIPE_SELECT_TILT_Y:
ix = RINT (cur_coords->ytilt / 2.0 * pipe->rank[i]) + pipe->rank[i] / 2;
break;
case PIPE_SELECT_CONSTANT:
default:
ix = pipe->index[i];
break;
}
pipe->index[i] = CLAMP (ix, 0, pipe->rank[i] - 1);
brushix += pipe->stride[i] * pipe->index[i];
}
/* Make sure is inside bounds */
brushix = CLAMP (brushix, 0, pipe->nbrushes - 1);
pipe->current = pipe->brushes[brushix];
return GIMP_BRUSH (pipe->current);
}
static gboolean
gimp_brush_pipe_want_null_motion (GimpBrush *brush,
GimpCoords *last_coords,
GimpCoords *cur_coords)
{
GimpBrushPipe *pipe = GIMP_BRUSH_PIPE (brush);
gint i;
if (pipe->nbrushes == 1)
return TRUE;
for (i = 0; i < pipe->dimension; i++)
if (pipe->select[i] == PIPE_SELECT_ANGULAR)
return FALSE;
return TRUE;
}
GList *
gimp_brush_pipe_load (const gchar *filename,
GError **error)
{
GimpBrushPipe *pipe = NULL;
GimpPixPipeParams params;
gint i;
gint num_of_brushes = 0;
gint totalcells;
gchar *paramstring;
GString *buffer;
gchar c;
gint fd;
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (g_path_is_absolute (filename), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
fd = g_open (filename, O_RDONLY | _O_BINARY, 0);
if (fd == -1)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_OPEN,
_("Could not open '%s' for reading: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
return NULL;
}
/* The file format starts with a painfully simple text header */
/* get the name */
buffer = g_string_new (NULL);
while (read (fd, &c, 1) == 1 && c != '\n' && buffer->len < 1024)
g_string_append_c (buffer, c);
if (buffer->len > 0 && buffer->len < 1024)
{
gchar *utf8 =
gimp_any_to_utf8 (buffer->str, buffer->len,
_("Invalid UTF-8 string in brush file '%s'."),
gimp_filename_to_utf8 (filename));
pipe = g_object_new (GIMP_TYPE_BRUSH_PIPE,
"name", utf8,
"mime-type", "image/x-gimp-gih",
NULL);
g_free (utf8);
}
g_string_free (buffer, TRUE);
if (! pipe)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file '%s': "
"File is corrupt."),
gimp_filename_to_utf8 (filename));
close (fd);
return NULL;
}
/* get the number of brushes */
buffer = g_string_new (NULL);
while (read (fd, &c, 1) == 1 && c != '\n' && buffer->len < 1024)
g_string_append_c (buffer, c);
if (buffer->len > 0 && buffer->len < 1024)
{
num_of_brushes = strtol (buffer->str, &paramstring, 10);
}
if (num_of_brushes < 1)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file '%s': "
"File is corrupt."),
gimp_filename_to_utf8 (filename));
close (fd);
g_object_unref (pipe);
g_string_free (buffer, TRUE);
return NULL;
}
while (*paramstring && g_ascii_isspace (*paramstring))
paramstring++;
if (*paramstring)
{
gimp_pixpipe_params_init (&params);
gimp_pixpipe_params_parse (paramstring, &params);
pipe->dimension = params.dim;
pipe->rank = g_new0 (gint, pipe->dimension);
pipe->select = g_new0 (PipeSelectModes, pipe->dimension);
pipe->index = g_new0 (gint, pipe->dimension);
/* placement is not used at all ?? */
if (params.free_placement_string)
g_free (params.placement);
for (i = 0; i < pipe->dimension; i++)
{
pipe->rank[i] = MAX (1, params.rank[i]);
if (strcmp (params.selection[i], "incremental") == 0)
pipe->select[i] = PIPE_SELECT_INCREMENTAL;
else if (strcmp (params.selection[i], "angular") == 0)
pipe->select[i] = PIPE_SELECT_ANGULAR;
else if (strcmp (params.selection[i], "velocity") == 0)
pipe->select[i] = PIPE_SELECT_VELOCITY;
else if (strcmp (params.selection[i], "random") == 0)
pipe->select[i] = PIPE_SELECT_RANDOM;
else if (strcmp (params.selection[i], "pressure") == 0)
pipe->select[i] = PIPE_SELECT_PRESSURE;
else if (strcmp (params.selection[i], "xtilt") == 0)
pipe->select[i] = PIPE_SELECT_TILT_X;
else if (strcmp (params.selection[i], "ytilt") == 0)
pipe->select[i] = PIPE_SELECT_TILT_Y;
else
pipe->select[i] = PIPE_SELECT_CONSTANT;
if (params.free_selection_string)
g_free (params.selection[i]);
pipe->index[i] = 0;
}
}
else
{
pipe->dimension = 1;
pipe->rank = g_new (gint, 1);
pipe->rank[0] = num_of_brushes;
pipe->select = g_new (PipeSelectModes, 1);
pipe->select[0] = PIPE_SELECT_INCREMENTAL;
pipe->index = g_new (gint, 1);
pipe->index[0] = 0;
}
g_string_free (buffer, TRUE);
totalcells = 1; /* Not all necessarily present, maybe */
for (i = 0; i < pipe->dimension; i++)
totalcells *= pipe->rank[i];
pipe->stride = g_new0 (gint, pipe->dimension);
for (i = 0; i < pipe->dimension; i++)
{
if (i == 0)
pipe->stride[i] = totalcells / pipe->rank[i];
else
pipe->stride[i] = pipe->stride[i-1] / pipe->rank[i];
}
g_assert (pipe->stride[pipe->dimension-1] == 1);
pipe->brushes = g_new0 (GimpBrush *, num_of_brushes);
while (pipe->nbrushes < num_of_brushes)
{
pipe->brushes[pipe->nbrushes] = gimp_brush_load_brush (fd, filename, NULL);
if (pipe->brushes[pipe->nbrushes])
{
gimp_object_set_name (GIMP_OBJECT (pipe->brushes[pipe->nbrushes]),
NULL);
}
else
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file '%s': "
"File is corrupt."),
gimp_filename_to_utf8 (filename));
close (fd);
g_object_unref (pipe);
return NULL;
}
pipe->nbrushes++;
}
close (fd);
/* Current brush is the first one. */
pipe->current = pipe->brushes[0];
/* just to satisfy the code that relies on this crap */
GIMP_BRUSH (pipe)->spacing = pipe->current->spacing;
GIMP_BRUSH (pipe)->x_axis = pipe->current->x_axis;
GIMP_BRUSH (pipe)->y_axis = pipe->current->y_axis;
GIMP_BRUSH (pipe)->mask = pipe->current->mask;
GIMP_BRUSH (pipe)->pixmap = pipe->current->pixmap;
return g_list_prepend (NULL, pipe);
}
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