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/*
* Copyright (C) 2006 Rob Buis <buis@kde.org>
* (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2008 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "CSSCursorImageValue.h"
#include "CSSImageValue.h"
#include "CachedImage.h"
#include "CachedResourceLoader.h"
#include "StyleCachedImage.h"
#include "StyleImage.h"
#include "StylePendingImage.h"
#include "TreeScope.h"
#include <wtf/MathExtras.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/WTFString.h>
#if ENABLE(SVG)
#include "SVGCursorElement.h"
#include "SVGLengthContext.h"
#include "SVGNames.h"
#include "SVGURIReference.h"
#endif
#if ENABLE(CSS_IMAGE_SET)
#include "CSSImageSetValue.h"
#include "StyleCachedImageSet.h"
#endif
namespace WebCore {
#if ENABLE(SVG)
static inline SVGCursorElement* resourceReferencedByCursorElement(const String& url, Document* document)
{
Element* element = SVGURIReference::targetElementFromIRIString(url, document);
if (element && element->hasTagName(SVGNames::cursorTag))
return static_cast<SVGCursorElement*>(element);
return 0;
}
#endif
CSSCursorImageValue::CSSCursorImageValue(PassRefPtr<CSSValue> imageValue, bool hasHotSpot, const IntPoint& hotSpot)
: CSSValue(CursorImageClass)
, m_imageValue(imageValue)
, m_hasHotSpot(hasHotSpot)
, m_hotSpot(hotSpot)
, m_accessedImage(false)
{
}
inline void CSSCursorImageValue::detachPendingImage()
{
if (m_image && m_image->isPendingImage())
static_cast<StylePendingImage&>(*m_image).detachFromCSSValue();
}
CSSCursorImageValue::~CSSCursorImageValue()
{
detachPendingImage();
#if ENABLE(SVG)
if (!isSVGCursor())
return;
HashSet<SVGElement*>::const_iterator it = m_referencedElements.begin();
HashSet<SVGElement*>::const_iterator end = m_referencedElements.end();
String url = static_cast<CSSImageValue*>(m_imageValue.get())->url();
for (; it != end; ++it) {
SVGElement* referencedElement = *it;
referencedElement->cursorImageValueRemoved();
if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, referencedElement->document()))
cursorElement->removeClient(referencedElement);
}
#endif
}
String CSSCursorImageValue::customCssText() const
{
StringBuilder result;
result.append(m_imageValue->cssText());
if (m_hasHotSpot) {
result.append(' ');
result.appendNumber(m_hotSpot.x());
result.append(' ');
result.appendNumber(m_hotSpot.y());
}
return result.toString();
}
bool CSSCursorImageValue::updateIfSVGCursorIsUsed(Element* element)
{
#if !ENABLE(SVG)
UNUSED_PARAM(element);
#else
if (!element || !element->isSVGElement())
return false;
if (!isSVGCursor())
return false;
String url = static_cast<CSSImageValue*>(m_imageValue.get())->url();
if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, element->document())) {
// FIXME: This will override hot spot specified in CSS, which is probably incorrect.
SVGLengthContext lengthContext(0);
m_hasHotSpot = true;
float x = roundf(cursorElement->x().value(lengthContext));
m_hotSpot.setX(static_cast<int>(x));
float y = roundf(cursorElement->y().value(lengthContext));
m_hotSpot.setY(static_cast<int>(y));
if (cachedImageURL() != element->document()->completeURL(cursorElement->href()))
clearCachedImage();
SVGElement* svgElement = toSVGElement(element);
m_referencedElements.add(svgElement);
svgElement->setCursorImageValue(this);
cursorElement->addClient(svgElement);
return true;
}
#endif
return false;
}
StyleImage* CSSCursorImageValue::cachedImage(CachedResourceLoader* loader)
{
#if ENABLE(CSS_IMAGE_SET)
if (m_imageValue->isImageSetValue())
return static_cast<CSSImageSetValue*>(m_imageValue.get())->cachedImageSet(loader);
#endif
if (!m_accessedImage) {
m_accessedImage = true;
#if ENABLE(SVG)
// For SVG images we need to lazily substitute in the correct URL. Rather than attempt
// to change the URL of the CSSImageValue (which would then change behavior like cssText),
// we create an alternate CSSImageValue to use.
if (isSVGCursor() && loader && loader->document()) {
RefPtr<CSSImageValue> imageValue = static_cast<CSSImageValue*>(m_imageValue.get());
// FIXME: This will fail if the <cursor> element is in a shadow DOM (bug 59827)
if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(imageValue->url(), loader->document())) {
detachPendingImage();
RefPtr<CSSImageValue> svgImageValue = CSSImageValue::create(cursorElement->href());
StyleCachedImage* cachedImage = svgImageValue->cachedImage(loader);
m_image = cachedImage;
return cachedImage;
}
}
#endif
if (m_imageValue->isImageValue()) {
detachPendingImage();
m_image = static_cast<CSSImageValue*>(m_imageValue.get())->cachedImage(loader);
}
}
if (m_image && m_image->isCachedImage())
return static_cast<StyleCachedImage*>(m_image.get());
return 0;
}
StyleImage* CSSCursorImageValue::cachedOrPendingImage(Document* document)
{
#if ENABLE(CSS_IMAGE_SET)
// Need to delegate completely so that changes in device scale factor can be handled appropriately.
if (m_imageValue->isImageSetValue())
return static_cast<CSSImageSetValue*>(m_imageValue.get())->cachedOrPendingImageSet(document);
#endif
if (!m_image)
m_image = StylePendingImage::create(this);
return m_image.get();
}
#if ENABLE(SVG)
bool CSSCursorImageValue::isSVGCursor() const
{
if (m_imageValue->isImageValue()) {
RefPtr<CSSImageValue> imageValue = static_cast<CSSImageValue*>(m_imageValue.get());
KURL kurl(ParsedURLString, imageValue->url());
return kurl.hasFragmentIdentifier();
}
return false;
}
String CSSCursorImageValue::cachedImageURL()
{
if (!m_image || !m_image->isCachedImage())
return String();
return static_cast<StyleCachedImage*>(m_image.get())->cachedImage()->url();
}
void CSSCursorImageValue::clearCachedImage()
{
detachPendingImage();
m_image.clear();
m_accessedImage = false;
}
void CSSCursorImageValue::removeReferencedElement(SVGElement* element)
{
m_referencedElements.remove(element);
}
#endif
bool CSSCursorImageValue::equals(const CSSCursorImageValue& other) const
{
return m_hasHotSpot ? other.m_hasHotSpot && m_hotSpot == other.m_hotSpot : !other.m_hasHotSpot
&& compareCSSValuePtr(m_imageValue, other.m_imageValue);
}
} // namespace WebCore
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