1/*
2 * Copyright (C) 2006 Rob Buis <buis@kde.org>
3 *           (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
4 * Copyright (C) 2008 Apple Inc. All rights reserved.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB.  If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22#include "config.h"
23#include "CSSCursorImageValue.h"
24
25#include "DocLoader.h"
26#include "Document.h"
27#include "PlatformString.h"
28#include <wtf/MathExtras.h>
29#include <wtf/UnusedParam.h>
30
31#if ENABLE(SVG)
32#include "SVGCursorElement.h"
33#include "SVGURIReference.h"
34#endif
35
36namespace WebCore {
37
38#if ENABLE(SVG)
39static inline bool isSVGCursorIdentifier(const String& url)
40{
41    KURL kurl(ParsedURLString, url);
42    return kurl.hasFragmentIdentifier();
43}
44
45static inline SVGCursorElement* resourceReferencedByCursorElement(const String& fragmentId, Document* document)
46{
47    Element* element = document->getElementById(SVGURIReference::getTarget(fragmentId));
48    if (element && element->hasTagName(SVGNames::cursorTag))
49        return static_cast<SVGCursorElement*>(element);
50
51    return 0;
52}
53#endif
54
55CSSCursorImageValue::CSSCursorImageValue(const String& url, const IntPoint& hotspot)
56    : CSSImageValue(url)
57    , m_hotspot(hotspot)
58{
59}
60
61CSSCursorImageValue::~CSSCursorImageValue()
62{
63#if ENABLE(SVG)
64    const String& url = getStringValue();
65    if (!isSVGCursorIdentifier(url))
66        return;
67
68    HashSet<SVGElement*>::const_iterator it = m_referencedElements.begin();
69    HashSet<SVGElement*>::const_iterator end = m_referencedElements.end();
70
71    for (; it != end; ++it) {
72        SVGElement* referencedElement = *it;
73        referencedElement->setCursorImageValue(0);
74        if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, referencedElement->document()))
75            cursorElement->removeClient(referencedElement);
76    }
77#endif
78}
79
80bool CSSCursorImageValue::updateIfSVGCursorIsUsed(Element* element)
81{
82#if !ENABLE(SVG)
83    UNUSED_PARAM(element);
84#else
85    if (!element || !element->isSVGElement())
86        return false;
87
88    const String& url = getStringValue();
89    if (!isSVGCursorIdentifier(url))
90        return false;
91
92    if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, element->document())) {
93        float x = roundf(cursorElement->x().value(0));
94        m_hotspot.setX(static_cast<int>(x));
95
96        float y = roundf(cursorElement->y().value(0));
97        m_hotspot.setY(static_cast<int>(y));
98
99        if (cachedImageURL() != element->document()->completeURL(cursorElement->href()))
100            clearCachedImage();
101
102        SVGElement* svgElement = static_cast<SVGElement*>(element);
103        m_referencedElements.add(svgElement);
104        svgElement->setCursorImageValue(this);
105        cursorElement->addClient(svgElement);
106        return true;
107    }
108#endif
109
110    return false;
111}
112
113StyleCachedImage* CSSCursorImageValue::cachedImage(DocLoader* loader)
114{
115    String url = getStringValue();
116
117#if ENABLE(SVG)
118    if (isSVGCursorIdentifier(url) && loader && loader->doc()) {
119        if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, loader->doc()))
120            url = cursorElement->href();
121    }
122#endif
123
124    return CSSImageValue::cachedImage(loader, url);
125}
126
127#if ENABLE(SVG)
128void CSSCursorImageValue::removeReferencedElement(SVGElement* element)
129{
130    m_referencedElements.remove(element);
131}
132#endif
133
134} // namespace WebCore
135