gimp/app/core/gimpbezierdesc.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpbezierdesc.c
* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <cairo.h>
#include "core-types.h"
#include "gimpbezierdesc.h"
#include "gimpboundary.h"
GType
gimp_bezier_desc_get_type (void)
{
static GType type = 0;
if (! type)
type = g_boxed_type_register_static ("GimpBezierDesc",
(GBoxedCopyFunc) gimp_bezier_desc_copy,
(GBoxedFreeFunc) gimp_bezier_desc_free);
return type;
}
GimpBezierDesc *
gimp_bezier_desc_new (cairo_path_data_t *data,
gint n_data)
{
GimpBezierDesc *desc;
g_return_val_if_fail (n_data == 0 || data != NULL, NULL);
desc = g_slice_new (GimpBezierDesc);
desc->status = CAIRO_STATUS_SUCCESS;
desc->num_data = n_data;
desc->data = data;
return desc;
}
static void
add_polyline (GArray *path_data,
const GimpVector2 *points,
gint n_points,
gboolean closed)
{
GimpVector2 prev = { 0.0, 0.0, };
cairo_path_data_t pd;
gint i;
for (i = 0; i < n_points; i++)
{
/* compress multiple identical coordinates */
if (i == 0 ||
prev.x != points[i].x ||
prev.y != points[i].y)
{
pd.header.type = (i == 0) ? CAIRO_PATH_MOVE_TO : CAIRO_PATH_LINE_TO;
pd.header.length = 2;
g_array_append_val (path_data, pd);
pd.point.x = points[i].x;
pd.point.y = points[i].y;
g_array_append_val (path_data, pd);
prev = points[i];
}
}
/* close the polyline when needed */
if (closed)
{
pd.header.type = CAIRO_PATH_CLOSE_PATH;
pd.header.length = 1;
g_array_append_val (path_data, pd);
}
}
GimpBezierDesc *
gimp_bezier_desc_new_from_bound_segs (GimpBoundSeg *bound_segs,
gint n_bound_segs,
gint n_bound_groups)
{
GArray *path_data;
GimpVector2 *points;
gint n_points;
gint seg;
gint i;
guint path_data_len;
g_return_val_if_fail (bound_segs != NULL, NULL);
g_return_val_if_fail (n_bound_segs > 0, NULL);
path_data = g_array_new (FALSE, FALSE, sizeof (cairo_path_data_t));
points = g_new0 (GimpVector2, n_bound_segs + 4);
seg = 0;
n_points = 0;
points[n_points].x = (gdouble) (bound_segs[0].x1);
points[n_points].y = (gdouble) (bound_segs[0].y1);
n_points++;
for (i = 0; i < n_bound_groups; i++)
{
while (bound_segs[seg].x1 != -1 ||
bound_segs[seg].x2 != -1 ||
bound_segs[seg].y1 != -1 ||
bound_segs[seg].y2 != -1)
{
points[n_points].x = (gdouble) (bound_segs[seg].x1);
points[n_points].y = (gdouble) (bound_segs[seg].y1);
n_points++;
seg++;
}
/* Close the stroke points up */
points[n_points] = points[0];
n_points++;
add_polyline (path_data, points, n_points, TRUE);
n_points = 0;
seg++;
points[n_points].x = (gdouble) (bound_segs[seg].x1);
points[n_points].y = (gdouble) (bound_segs[seg].y1);
n_points++;
}
g_free (points);
path_data_len = path_data->len;
return gimp_bezier_desc_new ((cairo_path_data_t *) g_array_free (path_data, FALSE),
path_data_len);
}
void
gimp_bezier_desc_translate (GimpBezierDesc *desc,
gdouble offset_x,
gdouble offset_y)
{
gint i, j;
g_return_if_fail (desc != NULL);
for (i = 0; i < desc->num_data; i += desc->data[i].header.length)
for (j = 1; j < desc->data[i].header.length; ++j)
{
desc->data[i+j].point.x += offset_x;
desc->data[i+j].point.y += offset_y;
}
}
GimpBezierDesc *
gimp_bezier_desc_copy (const GimpBezierDesc *desc)
{
g_return_val_if_fail (desc != NULL, NULL);
return gimp_bezier_desc_new (g_memdup (desc->data,
desc->num_data * sizeof (cairo_path_data_t)),
desc->num_data);
}
void
gimp_bezier_desc_free (GimpBezierDesc *desc)
{
g_return_if_fail (desc != NULL);
g_free (desc->data);
g_slice_free (GimpBezierDesc, desc);
}