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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_PENDING_IMAGE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_PENDING_IMAGE_H_
#include "third_party/blink/renderer/core/style/style_image.h"
#include "third_party/blink/renderer/platform/graphics/image.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
namespace blink {
class CSSValue;
class ImageResourceObserver;
// StylePendingImage is a placeholder StyleImage that is entered into the
// ComputedStyle during style resolution, in order to avoid loading images that
// are not referenced by the final style. They should only exist in a
// ComputedStyle for non-rendered elements created with EnsureComputedStyle or
// display:contents.
class StylePendingImage final : public StyleImage {
public:
explicit StylePendingImage(const CSSValue& value)
: value_(const_cast<CSSValue*>(&value)) {
is_pending_image_ = true;
}
WrappedImagePtr Data() const override { return value_.Get(); }
CSSValue* CssValue() const override { return value_; }
CSSValue* ComputedCSSValue(const ComputedStyle& style,
bool allow_visited_style) const override;
FloatSize ImageSize(const Document&,
float,
const FloatSize&,
RespectImageOrientationEnum) const override {
return FloatSize();
}
bool HasIntrinsicSize() const override { return true; }
void AddClient(ImageResourceObserver*) override {}
void RemoveClient(ImageResourceObserver*) override {}
scoped_refptr<Image> GetImage(const ImageResourceObserver&,
const Document&,
const ComputedStyle&,
const FloatSize& target_size) const override {
NOTREACHED();
return nullptr;
}
bool KnownToBeOpaque(const Document&, const ComputedStyle&) const override {
return false;
}
void Trace(Visitor* visitor) const override {
visitor->Trace(value_);
StyleImage::Trace(visitor);
}
private:
bool IsEqual(const StyleImage& other) const override;
Member<CSSValue> value_;
};
template <>
struct DowncastTraits<StylePendingImage> {
static bool AllowFrom(const StyleImage& styleImage) {
return styleImage.IsPendingImage();
}
};
inline bool StylePendingImage::IsEqual(const StyleImage& other) const {
if (!other.IsPendingImage())
return false;
const auto& other_pending = To<StylePendingImage>(other);
return value_ == other_pending.value_;
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_PENDING_IMAGE_H_
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