| /* -*- 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 |
| * Copyright © 2005 Red Hat, Inc. |
| * 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 University of Southern |
| * California. |
| * |
| * Contributor(s): |
| * Carl D. Worth <cworth@cworth.org> |
| * Kristian Høgsberg <krh@redhat.com> |
| * Chris Wilson <chris@chris-wilson.co.uk> |
| */ |
| |
| #include "cairoint.h" |
| #include "cairo-clip-private.h" |
| #include "cairo-error-private.h" |
| #include "cairo-freed-pool-private.h" |
| #include "cairo-gstate-private.h" |
| #include "cairo-path-fixed-private.h" |
| #include "cairo-pattern-private.h" |
| #include "cairo-composite-rectangles-private.h" |
| #include "cairo-region-private.h" |
| |
| cairo_status_t |
| _cairo_clip_combine_with_surface (const cairo_clip_t *clip, |
| cairo_surface_t *dst, |
| int dst_x, int dst_y) |
| { |
| cairo_clip_path_t *copy_path; |
| cairo_clip_path_t *clip_path; |
| cairo_clip_t *copy; |
| cairo_status_t status = CAIRO_STATUS_SUCCESS; |
| |
| copy = _cairo_clip_copy_with_translation (clip, -dst_x, -dst_y); |
| copy_path = copy->path; |
| copy->path = NULL; |
| |
| if (copy->boxes) { |
| status = _cairo_surface_paint (dst, |
| CAIRO_OPERATOR_IN, |
| &_cairo_pattern_white.base, |
| copy); |
| } |
| |
| clip = NULL; |
| if (_cairo_clip_is_region (copy)) |
| clip = copy; |
| clip_path = copy_path; |
| while (status == CAIRO_STATUS_SUCCESS && clip_path) { |
| status = _cairo_surface_fill (dst, |
| CAIRO_OPERATOR_IN, |
| &_cairo_pattern_white.base, |
| &clip_path->path, |
| clip_path->fill_rule, |
| clip_path->tolerance, |
| clip_path->antialias, |
| clip); |
| clip_path = clip_path->prev; |
| } |
| |
| copy->path = copy_path; |
| _cairo_clip_destroy (copy); |
| return status; |
| } |
| |
| static cairo_status_t |
| _cairo_path_fixed_add_box (cairo_path_fixed_t *path, |
| const cairo_box_t *box, |
| cairo_fixed_t fx, |
| cairo_fixed_t fy) |
| { |
| cairo_status_t status; |
| |
| status = _cairo_path_fixed_move_to (path, box->p1.x + fx, box->p1.y + fy); |
| if (unlikely (status)) |
| return status; |
| |
| status = _cairo_path_fixed_line_to (path, box->p2.x + fx, box->p1.y + fy); |
| if (unlikely (status)) |
| return status; |
| |
| status = _cairo_path_fixed_line_to (path, box->p2.x + fx, box->p2.y + fy); |
| if (unlikely (status)) |
| return status; |
| |
| status = _cairo_path_fixed_line_to (path, box->p1.x + fx, box->p2.y + fy); |
| if (unlikely (status)) |
| return status; |
| |
| return _cairo_path_fixed_close_path (path); |
| } |
| |
| cairo_surface_t * |
| _cairo_clip_get_surface (const cairo_clip_t *clip, |
| cairo_surface_t *target, |
| int *tx, int *ty) |
| { |
| cairo_surface_t *surface; |
| cairo_status_t status; |
| cairo_clip_t *copy, *region; |
| cairo_clip_path_t *copy_path, *clip_path; |
| |
| if (clip->num_boxes) { |
| cairo_path_fixed_t path; |
| int i; |
| |
| surface = _cairo_surface_create_scratch (target, |
| CAIRO_CONTENT_ALPHA, |
| clip->extents.width, |
| clip->extents.height, |
| CAIRO_COLOR_TRANSPARENT); |
| if (unlikely (surface->status)) |
| return surface; |
| |
| _cairo_path_fixed_init (&path); |
| status = CAIRO_STATUS_SUCCESS; |
| for (i = 0; status == CAIRO_STATUS_SUCCESS && i < clip->num_boxes; i++) { |
| status = _cairo_path_fixed_add_box (&path, &clip->boxes[i], |
| -_cairo_fixed_from_int (clip->extents.x), |
| -_cairo_fixed_from_int (clip->extents.y)); |
| } |
| if (status == CAIRO_STATUS_SUCCESS) |
| status = _cairo_surface_fill (surface, |
| CAIRO_OPERATOR_ADD, |
| &_cairo_pattern_white.base, |
| &path, |
| CAIRO_FILL_RULE_WINDING, |
| 1., |
| CAIRO_ANTIALIAS_DEFAULT, |
| NULL); |
| _cairo_path_fixed_fini (&path); |
| if (unlikely (status)) { |
| cairo_surface_destroy (surface); |
| return _cairo_surface_create_in_error (status); |
| } |
| } else { |
| surface = _cairo_surface_create_scratch (target, |
| CAIRO_CONTENT_ALPHA, |
| clip->extents.width, |
| clip->extents.height, |
| CAIRO_COLOR_WHITE); |
| if (unlikely (surface->status)) |
| return surface; |
| } |
| |
| copy = _cairo_clip_copy_with_translation (clip, |
| -clip->extents.x, |
| -clip->extents.y); |
| copy_path = copy->path; |
| copy->path = NULL; |
| |
| region = copy; |
| if (! _cairo_clip_is_region (copy)) |
| region = _cairo_clip_copy_region (copy); |
| |
| status = CAIRO_STATUS_SUCCESS; |
| clip_path = copy_path; |
| while (status == CAIRO_STATUS_SUCCESS && clip_path) { |
| status = _cairo_surface_fill (surface, |
| CAIRO_OPERATOR_IN, |
| &_cairo_pattern_white.base, |
| &clip_path->path, |
| clip_path->fill_rule, |
| clip_path->tolerance, |
| clip_path->antialias, |
| region); |
| clip_path = clip_path->prev; |
| } |
| |
| copy->path = copy_path; |
| _cairo_clip_destroy (copy); |
| if (region != copy) |
| _cairo_clip_destroy (region); |
| |
| if (unlikely (status)) { |
| cairo_surface_destroy (surface); |
| return _cairo_surface_create_in_error (status); |
| } |
| |
| *tx = clip->extents.x; |
| *ty = clip->extents.y; |
| return surface; |
| } |
| |
| cairo_surface_t * |
| _cairo_clip_get_image (const cairo_clip_t *clip, |
| cairo_surface_t *target, |
| const cairo_rectangle_int_t *extents) |
| { |
| cairo_surface_t *surface; |
| cairo_status_t status; |
| |
| surface = cairo_surface_create_similar_image (target, |
| CAIRO_FORMAT_A8, |
| extents->width, |
| extents->height); |
| if (unlikely (surface->status)) |
| return surface; |
| |
| status = _cairo_surface_paint (surface, CAIRO_OPERATOR_SOURCE, |
| &_cairo_pattern_white.base, NULL); |
| if (likely (status == CAIRO_STATUS_SUCCESS)) |
| status = _cairo_clip_combine_with_surface (clip, surface, |
| extents->x, extents->y); |
| |
| if (unlikely (status)) { |
| cairo_surface_destroy (surface); |
| surface = _cairo_surface_create_in_error (status); |
| } |
| |
| return surface; |
| } |