diff options
Diffstat (limited to 'libs/cairo-1.16.0/src/cairo-stroke-dash.c')
| -rw-r--r-- | libs/cairo-1.16.0/src/cairo-stroke-dash.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/src/cairo-stroke-dash.c b/libs/cairo-1.16.0/src/cairo-stroke-dash.c new file mode 100644 index 0000000..9494010 --- /dev/null +++ b/libs/cairo-1.16.0/src/cairo-stroke-dash.c @@ -0,0 +1,96 @@ +/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2002 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> + * Chris Wilson <chris@chris-wilson.co.uk> + */ + +#include "cairoint.h" + +#include "cairo-stroke-dash-private.h" + +void +_cairo_stroker_dash_start (cairo_stroker_dash_t *dash) +{ + double offset; + cairo_bool_t on = TRUE; + unsigned int i = 0; + + if (! dash->dashed) + return; + + offset = dash->dash_offset; + + /* We stop searching for a starting point as soon as the + offset reaches zero. Otherwise when an initial dash + segment shrinks to zero it will be skipped over. */ + while (offset > 0.0 && offset >= dash->dashes[i]) { + offset -= dash->dashes[i]; + on = !on; + if (++i == dash->num_dashes) + i = 0; + } + + dash->dash_index = i; + dash->dash_on = dash->dash_starts_on = on; + dash->dash_remain = dash->dashes[i] - offset; +} + +void +_cairo_stroker_dash_step (cairo_stroker_dash_t *dash, double step) +{ + dash->dash_remain -= step; + if (dash->dash_remain < CAIRO_FIXED_ERROR_DOUBLE) { + if (++dash->dash_index == dash->num_dashes) + dash->dash_index = 0; + + dash->dash_on = ! dash->dash_on; + dash->dash_remain += dash->dashes[dash->dash_index]; + } +} + +void +_cairo_stroker_dash_init (cairo_stroker_dash_t *dash, + const cairo_stroke_style_t *style) +{ + dash->dashed = style->dash != NULL; + if (! dash->dashed) + return; + + dash->dashes = style->dash; + dash->num_dashes = style->num_dashes; + dash->dash_offset = style->dash_offset; + + _cairo_stroker_dash_start (dash); +} |