diff options
Diffstat (limited to 'gfx/cairo/cairo/src/cairo-surface-clipper.c')
| -rw-r--r-- | gfx/cairo/cairo/src/cairo-surface-clipper.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/gfx/cairo/cairo/src/cairo-surface-clipper.c b/gfx/cairo/cairo/src/cairo-surface-clipper.c new file mode 100644 index 000000000..948730047 --- /dev/null +++ b/gfx/cairo/cairo/src/cairo-surface-clipper.c @@ -0,0 +1,135 @@ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2009 Chris Wilson + * + * 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 Red Hat, Inc. + * + * Contributor(s): + * Chris Wilson <chris@chris-wilson.co.uk> + */ + +#include "cairoint.h" + +#include "cairo-surface-clipper-private.h" + +/* A collection of routines to facilitate vector surface clipping */ + +static cairo_status_t +_cairo_surface_clipper_intersect_clip_path_recursive (cairo_surface_clipper_t *clipper, + cairo_clip_path_t *clip_path) +{ + cairo_status_t status; + + if (clip_path->prev != NULL) { + status = + _cairo_surface_clipper_intersect_clip_path_recursive (clipper, + clip_path->prev); + if (unlikely (status)) + return status; + } + + return clipper->intersect_clip_path (clipper, + &clip_path->path, + clip_path->fill_rule, + clip_path->tolerance, + clip_path->antialias); +} + +cairo_status_t +_cairo_surface_clipper_set_clip (cairo_surface_clipper_t *clipper, + cairo_clip_t *clip) +{ + cairo_status_t status; + cairo_bool_t clear; + + /* XXX as we cache a reference to the path, and compare every time, + * we may in future need to install a notification if the clip->path + * is every modified (e.g. cairo_clip_translate). + */ + + if (clip == NULL && clipper->clip.path == NULL) + return CAIRO_STATUS_SUCCESS; + + if (clip != NULL && clipper->clip.path != NULL && + _cairo_clip_equal (clip, &clipper->clip)) + { + return CAIRO_STATUS_SUCCESS; + } + + /* all clipped out state should never propagate this far */ + assert (clip == NULL || clip->path != NULL); + + /* Check whether this clip is a continuation of the previous. + * If not, we have to remove the current clip and rebuild. + */ + clear = clip == NULL || clip->path->prev != clipper->clip.path; + + _cairo_clip_reset (&clipper->clip); + _cairo_clip_init_copy (&clipper->clip, clip); + + if (clear) { + clipper->is_clipped = FALSE; + status = clipper->intersect_clip_path (clipper, NULL, 0, 0, 0); + if (unlikely (status)) + return status; + + if (clip != NULL && clip->path != NULL) { + status = + _cairo_surface_clipper_intersect_clip_path_recursive (clipper, + clip->path); + clipper->is_clipped = TRUE; + } + } else { + cairo_clip_path_t *path = clip->path; + + clipper->is_clipped = TRUE; + status = clipper->intersect_clip_path (clipper, + &path->path, + path->fill_rule, + path->tolerance, + path->antialias); + } + + return status; +} + +void +_cairo_surface_clipper_init (cairo_surface_clipper_t *clipper, + cairo_surface_clipper_intersect_clip_path_func_t func) +{ + _cairo_clip_init (&clipper->clip); + clipper->is_clipped = FALSE; + clipper->intersect_clip_path = func; +} + +void +_cairo_surface_clipper_reset (cairo_surface_clipper_t *clipper) +{ + _cairo_clip_reset (&clipper->clip); + clipper->is_clipped = FALSE; +} |