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| 4349 | Serge | 1 | /* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */ |
| 2 | /* cairo - a vector graphics library with display and print output |
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| 3 | * |
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| 4 | * Copyright © 2002 University of Southern California |
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| 5 | * Copyright © 2005 Red Hat, Inc. |
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| 6 | * Copyright © 2009 Chris Wilson |
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| 7 | * |
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| 8 | * This library is free software; you can redistribute it and/or |
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| 9 | * modify it either under the terms of the GNU Lesser General Public |
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| 10 | * License version 2.1 as published by the Free Software Foundation |
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| 11 | * (the "LGPL") or, at your option, under the terms of the Mozilla |
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| 12 | * Public License Version 1.1 (the "MPL"). If you do not alter this |
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| 13 | * notice, a recipient may use your version of this file under either |
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| 14 | * the MPL or the LGPL. |
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| 15 | * |
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| 16 | * You should have received a copy of the LGPL along with this library |
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| 17 | * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
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| 19 | * You should have received a copy of the MPL along with this library |
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| 20 | * in the file COPYING-MPL-1.1 |
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| 21 | * |
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| 22 | * The contents of this file are subject to the Mozilla Public License |
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| 23 | * Version 1.1 (the "License"); you may not use this file except in |
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| 24 | * compliance with the License. You may obtain a copy of the License at |
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| 25 | * http://www.mozilla.org/MPL/ |
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| 26 | * |
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| 27 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
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| 28 | * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
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| 29 | * the specific language governing rights and limitations. |
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| 30 | * |
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| 31 | * The Original Code is the cairo graphics library. |
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| 32 | * |
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| 33 | * The Initial Developer of the Original Code is University of Southern |
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| 34 | * California. |
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| 35 | * |
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| 36 | * Contributor(s): |
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| 37 | * Carl D. Worth |
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| 38 | * Kristian Høgsberg |
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| 39 | * Chris Wilson |
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| 40 | */ |
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| 41 | |||
| 42 | #include "cairoint.h" |
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| 43 | #include "cairo-clip-private.h" |
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| 44 | #include "cairo-error-private.h" |
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| 45 | #include "cairo-freed-pool-private.h" |
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| 46 | #include "cairo-gstate-private.h" |
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| 47 | #include "cairo-path-fixed-private.h" |
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| 48 | #include "cairo-pattern-private.h" |
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| 49 | #include "cairo-composite-rectangles-private.h" |
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| 50 | #include "cairo-region-private.h" |
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| 51 | |||
| 52 | static void |
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| 53 | _cairo_clip_extract_region (cairo_clip_t *clip) |
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| 54 | { |
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| 55 | cairo_rectangle_int_t stack_rects[CAIRO_STACK_ARRAY_LENGTH (cairo_rectangle_int_t)]; |
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| 56 | cairo_rectangle_int_t *r = stack_rects; |
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| 57 | cairo_bool_t is_region; |
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| 58 | int i; |
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| 59 | |||
| 60 | if (clip->num_boxes == 0) |
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| 61 | return; |
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| 62 | |||
| 63 | if (clip->num_boxes > ARRAY_LENGTH (stack_rects)) { |
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| 64 | r = _cairo_malloc_ab (clip->num_boxes, sizeof (cairo_rectangle_int_t)); |
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| 65 | if (r == NULL){ |
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| 66 | _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); |
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| 67 | return; |
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| 68 | } |
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| 69 | } |
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| 70 | |||
| 71 | is_region = clip->path == NULL; |
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| 72 | for (i = 0; i < clip->num_boxes; i++) { |
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| 73 | cairo_box_t *b = &clip->boxes[i]; |
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| 74 | if (is_region) |
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| 75 | is_region = |
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| 76 | _cairo_fixed_is_integer (b->p1.x | b->p1.y | b->p2.x | b->p2.y); |
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| 77 | r[i].x = _cairo_fixed_integer_floor (b->p1.x); |
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| 78 | r[i].y = _cairo_fixed_integer_floor (b->p1.y); |
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| 79 | r[i].width = _cairo_fixed_integer_ceil (b->p2.x) - r[i].x; |
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| 80 | r[i].height = _cairo_fixed_integer_ceil (b->p2.y) - r[i].y; |
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| 81 | } |
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| 82 | clip->is_region = is_region; |
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| 83 | |||
| 84 | clip->region = cairo_region_create_rectangles (r, i); |
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| 85 | |||
| 86 | if (r != stack_rects) |
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| 87 | free (r); |
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| 88 | } |
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| 89 | |||
| 90 | cairo_region_t * |
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| 91 | _cairo_clip_get_region (const cairo_clip_t *clip) |
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| 92 | { |
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| 93 | if (clip == NULL) |
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| 94 | return NULL; |
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| 95 | |||
| 96 | if (clip->region == NULL) |
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| 97 | _cairo_clip_extract_region ((cairo_clip_t *) clip); |
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| 98 | |||
| 99 | return clip->region; |
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| 100 | } |
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| 101 | |||
| 102 | cairo_bool_t |
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| 103 | _cairo_clip_is_region (const cairo_clip_t *clip) |
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| 104 | { |
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| 105 | if (clip == NULL) |
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| 106 | return TRUE; |
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| 107 | |||
| 108 | if (clip->is_region) |
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| 109 | return TRUE; |
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| 110 | |||
| 111 | /* XXX Geometric reduction? */ |
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| 112 | |||
| 113 | if (clip->path) |
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| 114 | return FALSE; |
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| 115 | |||
| 116 | if (clip->num_boxes == 0) |
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| 117 | return TRUE; |
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| 118 | |||
| 119 | if (clip->region == NULL) |
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| 120 | _cairo_clip_extract_region ((cairo_clip_t *) clip); |
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| 121 | |||
| 122 | return clip->is_region; |
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| 123 | } |