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/*

 * Copyright © 2012 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.

 *

 * The Initial Developer of the Original Code is Chris Wilson

 *

 * Contributor(s):

 *	Chris Wilson 

 */

#include "cairoint.h"

#include "cairo-damage-private.h"

#include "cairo-region-private.h"

static const cairo_damage_t __cairo_damage__nil = { CAIRO_STATUS_NO_MEMORY };

cairo_damage_t *

_cairo_damage_create_in_error (cairo_status_t status)

{

    _cairo_error_throw (status);

    return (cairo_damage_t *) &__cairo_damage__nil;

}

cairo_damage_t *

_cairo_damage_create (void)

{

    cairo_damage_t *damage;

    damage = malloc (sizeof (*damage));

    if (unlikely (damage == NULL)) {

	_cairo_error_throw(CAIRO_STATUS_NO_MEMORY);

	return (cairo_damage_t *) &__cairo_damage__nil;

    }

    damage->status = CAIRO_STATUS_SUCCESS;

    damage->region = NULL;

    damage->dirty = 0;

    damage->tail = &damage->chunks;

    damage->chunks.base = damage->boxes;

    damage->chunks.size = ARRAY_LENGTH(damage->boxes);

    damage->chunks.count = 0;

    damage->chunks.next = NULL;

    damage->remain = damage->chunks.size;

    return damage;

}

void

_cairo_damage_destroy (cairo_damage_t *damage)

{

    struct _cairo_damage_chunk *chunk, *next;

    if (damage == (cairo_damage_t *) &__cairo_damage__nil)

	return;

    for (chunk = damage->chunks.next; chunk != NULL; chunk = next) {

	next = chunk->next;

	free (chunk);

    }

    cairo_region_destroy (damage->region);

    free (damage);

}

static cairo_damage_t *

_cairo_damage_add_boxes(cairo_damage_t *damage,

			const cairo_box_t *boxes,

			int count)

{

    struct _cairo_damage_chunk *chunk;

    int n, size;

    TRACE ((stderr, "%s x%d\n", __FUNCTION__, count));

    if (damage == NULL)

	damage = _cairo_damage_create ();

    if (damage->status)

	return damage;

    damage->dirty += count;

    n = count;

    if (n > damage->remain)

	n = damage->remain;

    memcpy (damage->tail->base + damage->tail->count, boxes,

	    n * sizeof (cairo_box_t));

    count -= n;

    damage->tail->count += n;

    damage->remain -= n;

    if (count == 0)

	return damage;

    size = 2 * damage->tail->size;

    if (size < count)

	size = (count + 64) & ~63;

    chunk = malloc (sizeof (*chunk) + sizeof (cairo_box_t) * size);

    if (unlikely (chunk == NULL)) {

	_cairo_damage_destroy (damage);

	return (cairo_damage_t *) &__cairo_damage__nil;

    }

    chunk->next = NULL;

    chunk->base = (cairo_box_t *) (chunk + 1);

    chunk->size = size;

    chunk->count = count;

    damage->tail->next = chunk;

    damage->tail = chunk;

    memcpy (damage->tail->base, boxes + n,

	    count * sizeof (cairo_box_t));

    damage->remain = size - count;

    return damage;

}

cairo_damage_t *

_cairo_damage_add_box(cairo_damage_t *damage,

		      const cairo_box_t *box)

{

    TRACE ((stderr, "%s: (%d, %d),(%d, %d)\n", __FUNCTION__,

	    box->p1.x, box->p1.y, box->p2.x, box->p2.y));

    return _cairo_damage_add_boxes(damage, box, 1);

}

cairo_damage_t *

_cairo_damage_add_rectangle(cairo_damage_t *damage,

			    const cairo_rectangle_int_t *r)

{

    cairo_box_t box;

    TRACE ((stderr, "%s: (%d, %d)x(%d, %d)\n", __FUNCTION__,

	    r->x, r->y, r->width, r->height));

    box.p1.x = r->x;

    box.p1.y = r->y;

    box.p2.x = r->x + r->width;

    box.p2.y = r->y + r->height;

    return _cairo_damage_add_boxes(damage, &box, 1);

}

cairo_damage_t *

_cairo_damage_add_region (cairo_damage_t *damage,

			  const cairo_region_t *region)

{

    cairo_box_t *boxes;

    int nbox;

    TRACE ((stderr, "%s\n", __FUNCTION__));

    boxes = _cairo_region_get_boxes (region, &nbox);

    return _cairo_damage_add_boxes(damage, boxes, nbox);

}

cairo_damage_t *

_cairo_damage_reduce (cairo_damage_t *damage)

{

    cairo_box_t *free_boxes = NULL;

    cairo_box_t *boxes, *b;

    struct _cairo_damage_chunk *chunk, *last;

    TRACE ((stderr, "%s: dirty=%d\n", __FUNCTION__,

	    damage ? damage->dirty : -1));

    if (damage == NULL || damage->status || !damage->dirty)

	return damage;

    if (damage->region) {

	cairo_region_t *region;

	region = damage->region;

	damage->region = NULL;

	damage = _cairo_damage_add_region (damage, region);

	cairo_region_destroy (region);

	if (unlikely (damage->status))

	    return damage;

    }

    boxes = damage->tail->base;

    if (damage->dirty > damage->tail->size) {

	boxes = free_boxes = malloc (damage->dirty * sizeof (cairo_box_t));

	if (unlikely (boxes == NULL)) {

	    _cairo_damage_destroy (damage);

	    return (cairo_damage_t *) &__cairo_damage__nil;

	}

	b = boxes;

	last = NULL;

    } else {

	b = boxes + damage->tail->count;

	last = damage->tail;

    }

    for (chunk = &damage->chunks; chunk != last; chunk = chunk->next) {

	memcpy (b, chunk->base, chunk->count * sizeof (cairo_box_t));

	b += chunk->count;

    }

    damage->region = _cairo_region_create_from_boxes (boxes, damage->dirty);

    free (free_boxes);

    if (unlikely (damage->region->status)) {

	_cairo_damage_destroy (damage);

	return (cairo_damage_t *) &__cairo_damage__nil;

    }

    damage->dirty = 0;

    return damage;

}