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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 "core/css/CSSCursorImageValue.h"
#include "SVGNames.h"
#include "core/css/CSSImageSetValue.h"
#include "core/fetch/ImageResource.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/rendering/style/StyleFetchedImage.h"
#include "core/rendering/style/StyleFetchedImageSet.h"
#include "core/rendering/style/StyleImage.h"
#include "core/rendering/style/StylePendingImage.h"
#include "core/svg/SVGCursorElement.h"
#include "core/svg/SVGLengthContext.h"
#include "core/svg/SVGURIReference.h"
#include "wtf/MathExtras.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
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;
}
CSSCursorImageValue::CSSCursorImageValue(PassRefPtr<CSSValue> imageValue, bool hasHotSpot, const IntPoint& hotSpot)
: CSSValue(CursorImageClass)
, m_imageValue(imageValue)
, m_hasHotSpot(hasHotSpot)
, m_hotSpot(hotSpot)
, m_accessedImage(false)
{
}
CSSCursorImageValue::~CSSCursorImageValue()
{
if (!isSVGCursor())
return;
HashSet<SVGElement*>::const_iterator it = m_referencedElements.begin();
HashSet<SVGElement*>::const_iterator end = m_referencedElements.end();
String url = toCSSImageValue(m_imageValue.get())->url();
for (; it != end; ++it) {
SVGElement* referencedElement = *it;
referencedElement->cursorImageValueRemoved();
if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, referencedElement->document()))
cursorElement->removeClient(referencedElement);
}
}
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 (!element || !element->isSVGElement())
return false;
if (!isSVGCursor())
return false;
String url = toCSSImageValue(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->xCurrentValue().value(lengthContext));
m_hotSpot.setX(static_cast<int>(x));
float y = roundf(cursorElement->yCurrentValue().value(lengthContext));
m_hotSpot.setY(static_cast<int>(y));
if (cachedImageURL() != element->document().completeURL(cursorElement->hrefCurrentValue()))
clearImageResource();
SVGElement* svgElement = toSVGElement(element);
m_referencedElements.add(svgElement);
svgElement->setCursorImageValue(this);
cursorElement->addClient(svgElement);
return true;
}
return false;
}
StyleImage* CSSCursorImageValue::cachedImage(ResourceFetcher* loader, float deviceScaleFactor)
{
if (m_imageValue->isImageSetValue())
return toCSSImageSetValue(m_imageValue.get())->cachedImageSet(loader, deviceScaleFactor);
if (!m_accessedImage) {
m_accessedImage = true;
// 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 = toCSSImageValue(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())) {
RefPtr<CSSImageValue> svgImageValue = CSSImageValue::create(cursorElement->hrefCurrentValue());
StyleFetchedImage* cachedImage = svgImageValue->cachedImage(loader);
m_image = cachedImage;
return cachedImage;
}
}
if (m_imageValue->isImageValue())
m_image = toCSSImageValue(m_imageValue.get())->cachedImage(loader);
}
if (m_image && m_image->isImageResource())
return toStyleFetchedImage(m_image);
return 0;
}
StyleImage* CSSCursorImageValue::cachedOrPendingImage(float deviceScaleFactor)
{
// Need to delegate completely so that changes in device scale factor can be handled appropriately.
if (m_imageValue->isImageSetValue())
return toCSSImageSetValue(m_imageValue.get())->cachedOrPendingImageSet(deviceScaleFactor);
if (!m_image)
m_image = StylePendingImage::create(this);
return m_image.get();
}
bool CSSCursorImageValue::isSVGCursor() const
{
if (m_imageValue->isImageValue()) {
RefPtr<CSSImageValue> imageValue = toCSSImageValue(m_imageValue.get());
KURL kurl(ParsedURLString, imageValue->url());
return kurl.hasFragmentIdentifier();
}
return false;
}
String CSSCursorImageValue::cachedImageURL()
{
if (!m_image || !m_image->isImageResource())
return String();
return toStyleFetchedImage(m_image)->cachedImage()->url().string();
}
void CSSCursorImageValue::clearImageResource()
{
m_image = 0;
m_accessedImage = false;
}
void CSSCursorImageValue::removeReferencedElement(SVGElement* element)
{
m_referencedElements.remove(element);
}
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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