blob: b038844b61721f827e68e80d2a06f8a42e7dfc6d [file] [log] [blame]
* Copyright (C) 1999 Lars Knoll (
* (C) 1999 Antti Koivisto (
* (C) 2006 Allan Sandfeld Jensen (
* (C) 2006 Samuel Weinig (
* 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
* 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/layout/LayoutImageResource.h"
#include "core/layout/LayoutReplaced.h"
#include "platform/loader/fetch/ResourceClient.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 {
// These are the paddings to use when displaying either alt text or an image.
static const unsigned short kPaddingWidth = 4;
static const unsigned short kPaddingHeight = 4;
~LayoutImage() override;
static LayoutImage* CreateAnonymous(PseudoElement&);
void SetImageResource(LayoutImageResource*);
LayoutImageResource* ImageResource() { return image_resource_.Get(); }
const LayoutImageResource* ImageResource() const {
return image_resource_.Get();
ImageResourceContent* CachedImage() const {
return image_resource_ ? image_resource_->CachedImage() : nullptr;
HTMLMapElement* ImageMap() const;
void AreaElementFocusChanged(HTMLAreaElement*);
void SetIsGeneratedContent(bool generated = true) {
is_generated_content_ = generated;
bool IsGeneratedContent() const { return is_generated_content_; }
inline void SetImageDevicePixelRatio(float factor) {
image_device_pixel_ratio_ = factor;
float ImageDevicePixelRatio() const { return image_device_pixel_ratio_; }
void IntrinsicSizeChanged() override {
if (image_resource_)
ImageChanged(image_resource_->ImagePtr(), CanDeferInvalidation::kNo);
const char* GetName() const override { return "LayoutImage"; }
bool NeedsPreferredWidthsRecalculation() const final;
LayoutReplaced* EmbeddedReplacedContent() const;
void ComputeIntrinsicSizingInfo(IntrinsicSizingInfo&) const final;
bool GetNestedIntrinsicSizingInfo(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 == kLayoutObjectLayoutImage || LayoutReplaced::IsOfType(type);
void WillBeDestroyed() override;
void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
bool CanBeSelectionLeafInternal() const final { return true; }
bool IsImage() const override { return true; }
void PaintReplaced(const PaintInfo&, const LayoutPoint&) const override;
bool ForegroundIsKnownToBeOpaqueInRect(
const LayoutRect& local_rect,
unsigned max_depth_to_test) 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& location_in_container,
const LayoutPoint& accumulated_offset,
HitTestAction) final;
void InvalidatePaintAndMarkForLayoutIfNeeded(CanDeferInvalidation);
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> image_resource_;
bool did_increment_visually_non_empty_pixel_count_;
// This field stores whether this image is generated with 'content'.
bool is_generated_content_;
float image_device_pixel_ratio_;
} // namespace blink
#endif // LayoutImage_h