/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */

/* cairo - a vector graphics library with display and print output

 *

 * Copyright © 2003 University of Southern California

 *

 * This library is free software; you can redistribute it and/or

 * modify it either under the terms of the GNU Lesser General Public

 * License version 2.1 as published by the Free Software Foundation

 * (the "LGPL") or, at your option, under the terms of the Mozilla

 * Public License Version 1.1 (the "MPL"). If you do not alter this

 * notice, a recipient may use your version of this file under either

 * the MPL or the LGPL.

 *

 * You should have received a copy of the LGPL along with this library

 * in the file COPYING-LGPL-2.1; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA

 * You should have received a copy of the MPL along with this library

 * in the file COPYING-MPL-1.1

 *

 * The contents of this file are subject to the Mozilla Public License

 * Version 1.1 (the "License"); you may not use this file except in

 * compliance with the License. You may obtain a copy of the License at

 * http://www.mozilla.org/MPL/

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY

 * OF ANY KIND, either express or implied. See the LGPL or the MPL for

 * the specific language governing rights and limitations.

 *

 * The Original Code is the cairo graphics library.

 *

 * The Initial Developer of the Original Code is University of Southern

 * California.

 *

 * Contributor(s):

 *  Carl D. Worth <cworth@cworth.org>

 */

#include "cairoint.h"

#include "cairo-box-inline.h"

#include "cairo-error-private.h"

#include "cairo-path-fixed-private.h"

typedef struct _cairo_path_bounder {

    cairo_point_t current_point;

    cairo_bool_t has_extents;

    cairo_box_t extents;

} cairo_path_bounder_t;

static cairo_status_t

_cairo_path_bounder_move_to (void *closure,

           const cairo_point_t *point)

{

    cairo_path_bounder_t *bounder = closure;

    bounder->current_point = *point;

    if (likely (bounder->has_extents)) {

  _cairo_box_add_point (&bounder->extents, point);

    } else {

  bounder->has_extents = TRUE;

  _cairo_box_set (&bounder->extents, point, point);

    }

    return CAIRO_STATUS_SUCCESS;

}

static cairo_status_t

_cairo_path_bounder_line_to (void *closure,

           const cairo_point_t *point)

{

    cairo_path_bounder_t *bounder = closure;

    bounder->current_point = *point;

    _cairo_box_add_point (&bounder->extents, point);

    return CAIRO_STATUS_SUCCESS;

}

static cairo_status_t

_cairo_path_bounder_curve_to (void *closure,

            const cairo_point_t *b,

            const cairo_point_t *c,

            const cairo_point_t *d)

{

    cairo_path_bounder_t *bounder = closure;

    _cairo_box_add_curve_to (&bounder->extents,

           &bounder->current_point,

           b, c, d);

    bounder->current_point = *d;

    return CAIRO_STATUS_SUCCESS;

}

static cairo_status_t

_cairo_path_bounder_close_path (void *closure)

{

    return CAIRO_STATUS_SUCCESS;

}

cairo_bool_t

_cairo_path_bounder_extents (const cairo_path_fixed_t *path,

           cairo_box_t *extents)

{

    cairo_path_bounder_t bounder;

    cairo_status_t status;

    bounder.has_extents = FALSE;

    status = _cairo_path_fixed_interpret (path,

            _cairo_path_bounder_move_to,

            _cairo_path_bounder_line_to,

            _cairo_path_bounder_curve_to,

            _cairo_path_bounder_close_path,

            &bounder);

    assert (!status);

    if (bounder.has_extents)

  *extents = bounder.extents;

    return bounder.has_extents;

}

void

_cairo_path_fixed_approximate_clip_extents (const cairo_path_fixed_t *path,

              cairo_rectangle_int_t *extents)

{

    _cairo_path_fixed_approximate_fill_extents (path, extents);

}

void

_cairo_path_fixed_approximate_fill_extents (const cairo_path_fixed_t *path,

              cairo_rectangle_int_t *extents)

{

    _cairo_path_fixed_fill_extents (path, CAIRO_FILL_RULE_WINDING, 0, extents);

}

void

_cairo_path_fixed_fill_extents (const cairo_path_fixed_t  *path,

        cairo_fill_rule_t  fill_rule,

        double       tolerance,

        cairo_rectangle_int_t *extents)

{

    if (path->extents.p1.x < path->extents.p2.x &&

  path->extents.p1.y < path->extents.p2.y) {

  _cairo_box_round_to_rectangle (&path->extents, extents);

    } else {

  extents->x = extents->y = 0;

  extents->width = extents->height = 0;

    }

}

/* Adjusts the fill extents (above) by the device-space pen.  */

void

_cairo_path_fixed_approximate_stroke_extents (const cairo_path_fixed_t *path,

                const cairo_stroke_style_t *style,

                const cairo_matrix_t *ctm,

                cairo_bool_t is_vector,

                cairo_rectangle_int_t *extents)

{

    if (path->has_extents) {

  cairo_box_t box_extents;

  double dx, dy;

  _cairo_stroke_style_max_distance_from_path (style, path, ctm, &dx, &dy);

  if (is_vector)

  {

      /* When calculating extents for vector surfaces, ensure lines thinner

       * than the fixed point resolution are not optimized away. */

      double min = _cairo_fixed_to_double (CAIRO_FIXED_EPSILON*2);

      if (dx < min)

    dx = min;

      if (dy < min)

    dy = min;

  }

  box_extents = path->extents;

  box_extents.p1.x -= _cairo_fixed_from_double (dx);

  box_extents.p1.y -= _cairo_fixed_from_double (dy);

  box_extents.p2.x += _cairo_fixed_from_double (dx);

  box_extents.p2.y += _cairo_fixed_from_double (dy);

  _cairo_box_round_to_rectangle (&box_extents, extents);

    } else {

  extents->x = extents->y = 0;

  extents->width = extents->height = 0;

    }

}

cairo_status_t

_cairo_path_fixed_stroke_extents (const cairo_path_fixed_t  *path,

          const cairo_stroke_style_t  *stroke_style,

          const cairo_matrix_t    *ctm,

          const cairo_matrix_t    *ctm_inverse,

          double       tolerance,

          cairo_rectangle_int_t   *extents)

{

    cairo_polygon_t polygon;

    cairo_status_t status;

    cairo_stroke_style_t style;

    /* When calculating extents for vector surfaces, ensure lines thinner

     * than one point are not optimized away. */

    double min_line_width = _cairo_matrix_transformed_circle_major_axis (ctm_inverse, 1.0);

    if (stroke_style->line_width < min_line_width)

    {

  style = *stroke_style;

  style.line_width = min_line_width;

  stroke_style = &style;

    }

    _cairo_polygon_init (&polygon, NULL, 0);

    status = _cairo_path_fixed_stroke_to_polygon (path,

              stroke_style,

              ctm, ctm_inverse,

              tolerance,

              &polygon);

    _cairo_box_round_to_rectangle (&polygon.extents, extents);

    _cairo_polygon_fini (&polygon);

    return status;

}

cairo_bool_t

_cairo_path_fixed_extents (const cairo_path_fixed_t *path,

         cairo_box_t *box)

{

    *box = path->extents;

    return path->has_extents;

}