DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (27a812186ff4)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300
/* cairo - a vector graphics library with display and print output
 *
 * Copyright © 2009 Intel Corporation
 *
 * 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.
 *
 * Contributor(s):
 *	Chris Wilson <chris@chris-wilson.co.uk>
 */

#include "cairoint.h"

#include "cairo-boxes-private.h"
#include "cairo-error-private.h"

void
_cairo_boxes_init (cairo_boxes_t *boxes)
{
    boxes->status = CAIRO_STATUS_SUCCESS;
    boxes->num_limits = 0;
    boxes->num_boxes = 0;

    boxes->tail = &boxes->chunks;
    boxes->chunks.next = NULL;
    boxes->chunks.base = boxes->boxes_embedded;
    boxes->chunks.size = ARRAY_LENGTH (boxes->boxes_embedded);
    boxes->chunks.count = 0;

    boxes->is_pixel_aligned = TRUE;
}

void
_cairo_boxes_init_for_array (cairo_boxes_t *boxes,
			     cairo_box_t *array,
			     int num_boxes)
{
    int n;

    boxes->status = CAIRO_STATUS_SUCCESS;
    boxes->num_limits = 0;
    boxes->num_boxes = num_boxes;

    boxes->tail = &boxes->chunks;
    boxes->chunks.next = NULL;
    boxes->chunks.base = array;
    boxes->chunks.size = num_boxes;
    boxes->chunks.count = num_boxes;

    for (n = 0; n < num_boxes; n++) {
	if (! _cairo_fixed_is_integer (array[n].p1.x) ||
	    ! _cairo_fixed_is_integer (array[n].p1.y) ||
	    ! _cairo_fixed_is_integer (array[n].p2.x) ||
	    ! _cairo_fixed_is_integer (array[n].p2.y))
	{
	    break;
	}
    }

    boxes->is_pixel_aligned = n == num_boxes;
}

void
_cairo_boxes_limit (cairo_boxes_t	*boxes,
		    const cairo_box_t	*limits,
		    int			 num_limits)
{
    int n;

    boxes->limits = limits;
    boxes->num_limits = num_limits;

    if (boxes->num_limits) {
	boxes->limit = limits[0];
	for (n = 1; n < num_limits; n++) {
	    if (limits[n].p1.x < boxes->limit.p1.x)
		boxes->limit.p1.x = limits[n].p1.x;

	    if (limits[n].p1.y < boxes->limit.p1.y)
		boxes->limit.p1.y = limits[n].p1.y;

	    if (limits[n].p2.x > boxes->limit.p2.x)
		boxes->limit.p2.x = limits[n].p2.x;

	    if (limits[n].p2.y > boxes->limit.p2.y)
		boxes->limit.p2.y = limits[n].p2.y;
	}
    }
}

static void
_cairo_boxes_add_internal (cairo_boxes_t *boxes,
			   const cairo_box_t *box)
{
    struct _cairo_boxes_chunk *chunk;

    if (unlikely (boxes->status))
	return;

    chunk = boxes->tail;
    if (unlikely (chunk->count == chunk->size)) {
	int size;

	size = chunk->size * 2;
	chunk->next = _cairo_malloc_ab_plus_c (size,
					       sizeof (cairo_box_t),
					       sizeof (struct _cairo_boxes_chunk));

	if (unlikely (chunk->next == NULL)) {
	    boxes->status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
	    return;
	}

	chunk = chunk->next;
	boxes->tail = chunk;

	chunk->next = NULL;
	chunk->count = 0;
	chunk->size = size;
	chunk->base = (cairo_box_t *) (chunk + 1);
    }

    chunk->base[chunk->count++] = *box;
    boxes->num_boxes++;

    if (boxes->is_pixel_aligned) {
	boxes->is_pixel_aligned =
	    _cairo_fixed_is_integer (box->p1.x) &&
	    _cairo_fixed_is_integer (box->p1.y) &&
	    _cairo_fixed_is_integer (box->p2.x) &&
	    _cairo_fixed_is_integer (box->p2.y);
    }
}

cairo_status_t
_cairo_boxes_add (cairo_boxes_t *boxes,
		  const cairo_box_t *box)
{
    if (box->p1.y == box->p2.y)
	return CAIRO_STATUS_SUCCESS;

    if (box->p1.x == box->p2.x)
	return CAIRO_STATUS_SUCCESS;

    if (boxes->num_limits) {
	cairo_point_t p1, p2;
	cairo_bool_t reversed = FALSE;
	int n;

	/* support counter-clockwise winding for rectangular tessellation */
	if (box->p1.x < box->p2.x) {
	    p1.x = box->p1.x;
	    p2.x = box->p2.x;
	} else {
	    p2.x = box->p1.x;
	    p1.x = box->p2.x;
	    reversed = ! reversed;
	}

	if (p1.x >= boxes->limit.p2.x || p2.x <= boxes->limit.p1.x)
	    return CAIRO_STATUS_SUCCESS;

	if (box->p1.y < box->p2.y) {
	    p1.y = box->p1.y;
	    p2.y = box->p2.y;
	} else {
	    p2.y = box->p1.y;
	    p1.y = box->p2.y;
	    reversed = ! reversed;
	}

	if (p1.y >= boxes->limit.p2.y || p2.y <= boxes->limit.p1.y)
	    return CAIRO_STATUS_SUCCESS;

	for (n = 0; n < boxes->num_limits; n++) {
	    const cairo_box_t *limits = &boxes->limits[n];
	    cairo_box_t _box;
	    cairo_point_t _p1, _p2;

	    if (p1.x >= limits->p2.x || p2.x <= limits->p1.x)
		continue;
	    if (p1.y >= limits->p2.y || p2.y <= limits->p1.y)
		continue;

	    /* Otherwise, clip the box to the limits. */
	    _p1 = p1;
	    if (_p1.x < limits->p1.x)
		_p1.x = limits->p1.x;
	    if (_p1.y < limits->p1.y)
		_p1.y = limits->p1.y;

	    _p2 = p2;
	    if (_p2.x > limits->p2.x)
		_p2.x = limits->p2.x;
	    if (_p2.y > limits->p2.y)
		_p2.y = limits->p2.y;

	    if (_p2.y <= _p1.y || _p2.x <= _p1.x)
		continue;

	    _box.p1.y = _p1.y;
	    _box.p2.y = _p2.y;
	    if (reversed) {
		_box.p1.x = _p2.x;
		_box.p2.x = _p1.x;
	    } else {
		_box.p1.x = _p1.x;
		_box.p2.x = _p2.x;
	    }

	    _cairo_boxes_add_internal (boxes, &_box);
	}
    } else {
	_cairo_boxes_add_internal (boxes, box);
    }

    return boxes->status;
}

void
_cairo_boxes_extents (const cairo_boxes_t *boxes,
		      cairo_rectangle_int_t *extents)
{
    const struct _cairo_boxes_chunk *chunk;
    cairo_box_t box;
    int i;

    box.p1.y = box.p1.x = INT_MAX;
    box.p2.y = box.p2.x = INT_MIN;

    for (chunk = &boxes->chunks; chunk != NULL; chunk = chunk->next) {
	const cairo_box_t *b = chunk->base;
	for (i = 0; i < chunk->count; i++) {
	    if (b[i].p1.x < box.p1.x)
		box.p1.x = b[i].p1.x;

	    if (b[i].p1.y < box.p1.y)
		box.p1.y = b[i].p1.y;

	    if (b[i].p2.x > box.p2.x)
		box.p2.x = b[i].p2.x;

	    if (b[i].p2.y > box.p2.y)
		box.p2.y = b[i].p2.y;
	}
    }

    _cairo_box_round_to_rectangle (&box, extents);
}

void
_cairo_boxes_clear (cairo_boxes_t *boxes)
{
    struct _cairo_boxes_chunk *chunk, *next;

    for (chunk = boxes->chunks.next; chunk != NULL; chunk = next) {
	next = chunk->next;
	free (chunk);
    }

    boxes->tail = &boxes->chunks;
    boxes->chunks.next = 0;
    boxes->chunks.count = 0;
    boxes->num_boxes = 0;

    boxes->is_pixel_aligned = TRUE;
}

void
_cairo_boxes_fini (cairo_boxes_t *boxes)
{
    struct _cairo_boxes_chunk *chunk, *next;

    for (chunk = boxes->chunks.next; chunk != NULL; chunk = next) {
	next = chunk->next;
	free (chunk);
    }
}