1/*
2 * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
3 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#include "config.h"
23#include "core/rendering/style/ShadowData.h"
24
25#include "core/platform/graphics/LayoutRect.h"
26
27using namespace std;
28
29namespace WebCore {
30
31ShadowData::ShadowData(const ShadowData& o)
32    : m_location(o.m_location)
33    , m_blur(o.m_blur)
34    , m_spread(o.m_spread)
35    , m_color(o.m_color)
36    , m_style(o.m_style)
37    , m_next(o.m_next ? adoptPtr(new ShadowData(*o.m_next)) : nullptr)
38{
39}
40
41bool ShadowData::operator==(const ShadowData& o) const
42{
43    if ((m_next && !o.m_next) || (!m_next && o.m_next)
44        || (m_next && o.m_next && *m_next != *o.m_next))
45        return false;
46
47    return m_location == o.m_location
48        && m_blur == o.m_blur
49        && m_spread == o.m_spread
50        && m_style == o.m_style
51        && m_color == o.m_color;
52}
53
54static inline void calculateShadowExtent(const ShadowData* shadow, int additionalOutlineSize, int& shadowLeft, int& shadowRight, int& shadowTop, int& shadowBottom)
55{
56    do {
57        int blurAndSpread = shadow->blur() + shadow->spread() + additionalOutlineSize;
58        if (shadow->style() == Normal) {
59            shadowLeft = min(shadow->x() - blurAndSpread, shadowLeft);
60            shadowRight = max(shadow->x() + blurAndSpread, shadowRight);
61            shadowTop = min(shadow->y() - blurAndSpread, shadowTop);
62            shadowBottom = max(shadow->y() + blurAndSpread, shadowBottom);
63        }
64
65        shadow = shadow->next();
66    } while (shadow);
67}
68
69void ShadowData::adjustRectForShadow(LayoutRect& rect, int additionalOutlineSize) const
70{
71    int shadowLeft = 0;
72    int shadowRight = 0;
73    int shadowTop = 0;
74    int shadowBottom = 0;
75    calculateShadowExtent(this, additionalOutlineSize, shadowLeft, shadowRight, shadowTop, shadowBottom);
76
77    rect.move(shadowLeft, shadowTop);
78    rect.setWidth(rect.width() - shadowLeft + shadowRight);
79    rect.setHeight(rect.height() - shadowTop + shadowBottom);
80}
81
82void ShadowData::adjustRectForShadow(FloatRect& rect, int additionalOutlineSize) const
83{
84    int shadowLeft = 0;
85    int shadowRight = 0;
86    int shadowTop = 0;
87    int shadowBottom = 0;
88    calculateShadowExtent(this, additionalOutlineSize, shadowLeft, shadowRight, shadowTop, shadowBottom);
89
90    rect.move(shadowLeft, shadowTop);
91    rect.setWidth(rect.width() - shadowLeft + shadowRight);
92    rect.setHeight(rect.height() - shadowTop + shadowBottom);
93}
94
95} // namespace WebCore
96