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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 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.
*
*/
#ifndef LayoutImage_h
#define LayoutImage_h
#include "core/CoreExport.h"
#include "core/fetch/ResourceClient.h"
#include "core/layout/LayoutImageResource.h"
#include "core/layout/LayoutReplaced.h"
namespace blink {
class HTMLAreaElement;
class HTMLMapElement;
// LayoutImage is used to display any image type.
//
// There is 2 types of images:
// * normal images, e.g. <image>, <picture>.
// * content images with "content: url(path/to/image.png)".
// We store the type inside m_isGeneratedContent.
//
// The class is image type agnostic as it only manipulates decoded images.
// See LayoutImageResource that holds this image.
class CORE_EXPORT LayoutImage : public LayoutReplaced {
public:
// These are the paddings to use when displaying either alt text or an image.
static const unsigned short paddingWidth = 4;
static const unsigned short paddingHeight = 4;
LayoutImage(Element*);
~LayoutImage() override;
static LayoutImage* createAnonymous(Document*);
void setImageResource(LayoutImageResource*);
LayoutImageResource* imageResource() { return m_imageResource.get(); }
const LayoutImageResource* imageResource() const {
return m_imageResource.get();
}
ImageResourceContent* cachedImage() const {
return m_imageResource ? m_imageResource->cachedImage() : 0;
}
HTMLMapElement* imageMap() const;
void areaElementFocusChanged(HTMLAreaElement*);
void setIsGeneratedContent(bool generated = true) {
m_isGeneratedContent = generated;
}
bool isGeneratedContent() const { return m_isGeneratedContent; }
inline void setImageDevicePixelRatio(float factor) {
m_imageDevicePixelRatio = factor;
}
float imageDevicePixelRatio() const { return m_imageDevicePixelRatio; }
void intrinsicSizeChanged() override {
if (m_imageResource)
imageChanged(m_imageResource->imagePtr());
}
const char* name() const override { return "LayoutImage"; }
protected:
bool needsPreferredWidthsRecalculation() const final;
LayoutReplaced* embeddedReplacedContent() const final;
void computeIntrinsicSizingInfo(IntrinsicSizingInfo&) const final;
void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override;
void paint(const PaintInfo&, const LayoutPoint&) const final;
bool isOfType(LayoutObjectType type) const override {
return type == LayoutObjectLayoutImage || LayoutReplaced::isOfType(type);
}
void willBeDestroyed() override;
void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
private:
bool isImage() const override { return true; }
void paintReplaced(const PaintInfo&, const LayoutPoint&) const override;
bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect,
unsigned maxDepthToTest) const final;
bool computeBackgroundIsKnownToBeObscured() const final;
bool backgroundShouldAlwaysBeClipped() const override { return true; }
LayoutUnit minimumReplacedHeight() const override;
void imageNotifyFinished(ImageResourceContent*) final;
bool nodeAtPoint(HitTestResult&,
const HitTestLocation& locationInContainer,
const LayoutPoint& accumulatedOffset,
HitTestAction) final;
void invalidatePaintAndMarkForLayoutIfNeeded();
void updateIntrinsicSizeIfNeeded(const LayoutSize&);
// This member wraps the associated decoded image.
//
// This field is set using setImageResource above which can be called in
// several ways:
// * For normal images, from the network stack (ImageLoader) once we have
// some image data.
// * For generated content, the resource is loaded during style resolution
// and thus is stored in ComputedStyle (see ContentData::image) that gets
// propagated to the anonymous LayoutImage in LayoutObject::createObject.
Persistent<LayoutImageResource> m_imageResource;
bool m_didIncrementVisuallyNonEmptyPixelCount;
// This field stores whether this image is generated with 'content'.
bool m_isGeneratedContent;
float m_imageDevicePixelRatio;
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutImage, isLayoutImage());
} // namespace blink
#endif // LayoutImage_h
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