forked from KolibriOS/kolibrios
354 lines
10 KiB
C
354 lines
10 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2003 University of Southern California
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is University of Southern
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* California.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@cworth.org>
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*/
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#include "cairoint.h"
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#include "cairo-path-fixed-private.h"
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typedef struct cairo_path_bounder {
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cairo_point_t current_point;
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cairo_bool_t has_initial_point;
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cairo_bool_t has_point;
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cairo_box_t extents;
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} cairo_path_bounder_t;
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static void
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_cairo_path_bounder_init (cairo_path_bounder_t *bounder)
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{
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bounder->has_initial_point = FALSE;
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bounder->has_point = FALSE;
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}
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static void
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_cairo_path_bounder_add_point (cairo_path_bounder_t *bounder,
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const cairo_point_t *point)
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{
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if (bounder->has_point) {
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if (point->x < bounder->extents.p1.x)
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bounder->extents.p1.x = point->x;
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if (point->y < bounder->extents.p1.y)
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bounder->extents.p1.y = point->y;
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if (point->x > bounder->extents.p2.x)
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bounder->extents.p2.x = point->x;
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if (point->y > bounder->extents.p2.y)
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bounder->extents.p2.y = point->y;
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} else {
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bounder->extents.p1.x = point->x;
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bounder->extents.p1.y = point->y;
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bounder->extents.p2.x = point->x;
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bounder->extents.p2.y = point->y;
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bounder->has_point = TRUE;
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}
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}
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static cairo_status_t
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_cairo_path_bounder_move_to (void *closure,
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const cairo_point_t *point)
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{
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cairo_path_bounder_t *bounder = closure;
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bounder->current_point = *point;
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bounder->has_initial_point = TRUE;
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_status_t
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_cairo_path_bounder_line_to (void *closure,
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const cairo_point_t *point)
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{
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cairo_path_bounder_t *bounder = closure;
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if (bounder->has_initial_point) {
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_cairo_path_bounder_add_point (bounder, &bounder->current_point);
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bounder->has_initial_point = FALSE;
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}
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_cairo_path_bounder_add_point (bounder, point);
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bounder->current_point = *point;
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_status_t
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_cairo_path_bounder_curve_to (void *closure,
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const cairo_point_t *b,
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const cairo_point_t *c,
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const cairo_point_t *d)
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{
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cairo_path_bounder_t *bounder = closure;
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/* If the bbox of the control points is entirely inside, then we
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* do not need to further evaluate the spline.
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*/
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if (! bounder->has_point ||
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b->x < bounder->extents.p1.x || b->x > bounder->extents.p2.x ||
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b->y < bounder->extents.p1.y || b->y > bounder->extents.p2.y ||
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c->x < bounder->extents.p1.x || c->x > bounder->extents.p2.x ||
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c->y < bounder->extents.p1.y || c->y > bounder->extents.p2.y ||
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d->x < bounder->extents.p1.x || d->x > bounder->extents.p2.x ||
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d->y < bounder->extents.p1.y || d->y > bounder->extents.p2.y)
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{
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return _cairo_spline_bound (_cairo_path_bounder_line_to, bounder,
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&bounder->current_point, b, c, d);
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}
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else
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{
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/* All control points are within the current extents. */
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bounder->current_point = *d;
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return CAIRO_STATUS_SUCCESS;
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}
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}
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static cairo_status_t
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_cairo_path_bounder_close_path (void *closure)
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{
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return CAIRO_STATUS_SUCCESS;
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}
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/* This computes the extents of all the points in the path, not those of
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* the damage area (i.e it does not consider winding and it only inspects
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* the control points of the curves, not the flattened path).
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*/
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void
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_cairo_path_fixed_approximate_clip_extents (const cairo_path_fixed_t *path,
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cairo_rectangle_int_t *extents)
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{
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if (path->extents.p1.x < path->extents.p2.x) {
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_cairo_box_round_to_rectangle (&path->extents, extents);
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} else {
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extents->x = extents->y = 0;
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extents->width = extents->height = 0;
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}
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}
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/* A slightly better approximation than above - we actually decompose the
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* Bezier, but we continue to ignore winding.
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*/
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void
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_cairo_path_fixed_approximate_fill_extents (const cairo_path_fixed_t *path,
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cairo_rectangle_int_t *extents)
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{
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cairo_path_bounder_t bounder;
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cairo_status_t status;
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if (! path->has_curve_to) {
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bounder.extents = path->extents;
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bounder.has_point = path->extents.p1.x < path->extents.p2.x;
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} else {
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_cairo_path_bounder_init (&bounder);
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status = _cairo_path_fixed_interpret (path, CAIRO_DIRECTION_FORWARD,
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_cairo_path_bounder_move_to,
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_cairo_path_bounder_line_to,
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_cairo_path_bounder_curve_to,
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_cairo_path_bounder_close_path,
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&bounder);
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assert (status == CAIRO_STATUS_SUCCESS);
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}
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if (bounder.has_point) {
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_cairo_box_round_to_rectangle (&bounder.extents, extents);
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} else {
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extents->x = extents->y = 0;
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extents->width = extents->height = 0;
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}
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}
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void
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_cairo_path_fixed_fill_extents (const cairo_path_fixed_t *path,
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cairo_fill_rule_t fill_rule,
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double tolerance,
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cairo_rectangle_int_t *extents)
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{
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cairo_path_bounder_t bounder;
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cairo_status_t status;
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if (! path->has_curve_to) {
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bounder.extents = path->extents;
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bounder.has_point = path->extents.p1.x < path->extents.p2.x;
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} else {
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_cairo_path_bounder_init (&bounder);
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status = _cairo_path_fixed_interpret_flat (path, CAIRO_DIRECTION_FORWARD,
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_cairo_path_bounder_move_to,
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_cairo_path_bounder_line_to,
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_cairo_path_bounder_close_path,
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&bounder, tolerance);
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assert (status == CAIRO_STATUS_SUCCESS);
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}
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if (bounder.has_point) {
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_cairo_box_round_to_rectangle (&bounder.extents, extents);
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} else {
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extents->x = extents->y = 0;
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extents->width = extents->height = 0;
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}
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}
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/* Adjusts the fill extents (above) by the device-space pen. */
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void
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_cairo_path_fixed_approximate_stroke_extents (const cairo_path_fixed_t *path,
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const cairo_stroke_style_t *style,
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const cairo_matrix_t *ctm,
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cairo_rectangle_int_t *extents)
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{
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cairo_path_bounder_t bounder;
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cairo_status_t status;
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if (! path->has_curve_to) {
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bounder.extents = path->extents;
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/* include trailing move-to for degenerate segments */
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if (path->has_last_move_point) {
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const cairo_point_t *point = &path->last_move_point;
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if (point->x < bounder.extents.p1.x)
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bounder.extents.p1.x = point->x;
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if (point->y < bounder.extents.p1.y)
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bounder.extents.p1.y = point->y;
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if (point->x > bounder.extents.p2.x)
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bounder.extents.p2.x = point->x;
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if (point->y > bounder.extents.p2.y)
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bounder.extents.p2.y = point->y;
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}
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bounder.has_point = bounder.extents.p1.x <= bounder.extents.p2.x;
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bounder.has_initial_point = FALSE;
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} else {
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_cairo_path_bounder_init (&bounder);
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status = _cairo_path_fixed_interpret (path, CAIRO_DIRECTION_FORWARD,
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_cairo_path_bounder_move_to,
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_cairo_path_bounder_line_to,
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_cairo_path_bounder_curve_to,
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_cairo_path_bounder_close_path,
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&bounder);
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assert (status == CAIRO_STATUS_SUCCESS);
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}
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if (bounder.has_point) {
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double dx, dy;
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_cairo_stroke_style_max_distance_from_path (style, ctm, &dx, &dy);
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bounder.extents.p1.x -= _cairo_fixed_from_double (dx);
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bounder.extents.p2.x += _cairo_fixed_from_double (dx);
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bounder.extents.p1.y -= _cairo_fixed_from_double (dy);
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bounder.extents.p2.y += _cairo_fixed_from_double (dy);
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_cairo_box_round_to_rectangle (&bounder.extents, extents);
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} else if (bounder.has_initial_point) {
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double dx, dy;
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/* accommodate capping of degenerate paths */
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_cairo_stroke_style_max_distance_from_path (style, ctm, &dx, &dy);
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bounder.extents.p1.x = bounder.current_point.x - _cairo_fixed_from_double (dx);
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bounder.extents.p2.x = bounder.current_point.x + _cairo_fixed_from_double (dx);
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bounder.extents.p1.y = bounder.current_point.y - _cairo_fixed_from_double (dy);
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bounder.extents.p2.y = bounder.current_point.y + _cairo_fixed_from_double (dy);
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_cairo_box_round_to_rectangle (&bounder.extents, extents);
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} else {
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extents->x = extents->y = 0;
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extents->width = extents->height = 0;
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}
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}
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cairo_status_t
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_cairo_path_fixed_stroke_extents (const cairo_path_fixed_t *path,
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const cairo_stroke_style_t *stroke_style,
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const cairo_matrix_t *ctm,
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const cairo_matrix_t *ctm_inverse,
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double tolerance,
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cairo_rectangle_int_t *extents)
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{
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cairo_traps_t traps;
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cairo_box_t bbox;
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cairo_status_t status;
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_cairo_traps_init (&traps);
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status = _cairo_path_fixed_stroke_to_traps (path,
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stroke_style,
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ctm,
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ctm_inverse,
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tolerance,
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&traps);
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_cairo_traps_extents (&traps, &bbox);
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_cairo_traps_fini (&traps);
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_cairo_box_round_to_rectangle (&bbox, extents);
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return status;
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}
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cairo_bool_t
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_cairo_path_fixed_extents (const cairo_path_fixed_t *path,
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cairo_box_t *box)
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{
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cairo_path_bounder_t bounder;
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cairo_status_t status;
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if (! path->has_curve_to) {
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*box = path->extents;
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/* empty extents should still have an origin and should not
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* be {0, 0, 0, 0} */
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return path->extents.p1.x <= path->extents.p2.x;
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}
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_cairo_path_bounder_init (&bounder);
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status = _cairo_path_fixed_interpret (path, CAIRO_DIRECTION_FORWARD,
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_cairo_path_bounder_move_to,
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_cairo_path_bounder_line_to,
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_cairo_path_bounder_curve_to,
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_cairo_path_bounder_close_path,
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&bounder);
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assert (status == CAIRO_STATUS_SUCCESS);
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*box = bounder.extents;
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return bounder.has_point;
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}
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