third_party/WebKit/Source/core/style/StylePendingImage.h

   1 /*
   2  * Copyright (C) 2010 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef StylePendingImage_h
  27 #define StylePendingImage_h
  28
  29 #include "core/css/CSSCursorImageValue.h"
  30 #include "core/css/CSSImageGeneratorValue.h"
  31 #include "core/css/CSSImageSetValue.h"
  32 #include "core/css/CSSImageValue.h"
  33 #include "core/style/StyleImage.h"
  34 #include "platform/graphics/Image.h"
  35
  36 namespace blink {
  37
  38 // StylePendingImage is a placeholder StyleImage that is entered into the ComputedStyle during
  39 // style resolution, in order to avoid loading images that are not referenced by the final style.
  40 // They should never exist in a ComputedStyle after it has been returned from the style selector.
  41
  42 class StylePendingImage final : public StyleImage {
  43 public:
  44     static PassRefPtrWillBeRawPtr<StylePendingImage> create(CSSValue* value)
  45     {
  46         return adoptRefWillBeNoop(new StylePendingImage(value));
  47     }
  48
  49     WrappedImagePtr data() const override { return m_value; }
  50
  51     PassRefPtrWillBeRawPtr<CSSValue> cssValue() const override { return m_value; }
  52
  53     PassRefPtrWillBeRawPtr<CSSValue> computedCSSValue() const override
  54     {
  55         ASSERT_NOT_REACHED();
  56         return nullptr;
  57     }
  58
  59     CSSImageValue* cssImageValue() const { return m_value->isImageValue() ? toCSSImageValue(m_value) : 0; }
  60     CSSImageGeneratorValue* cssImageGeneratorValue() const { return m_value->isImageGeneratorValue() ? toCSSImageGeneratorValue(m_value) : 0; }
  61     CSSCursorImageValue* cssCursorImageValue() const { return m_value->isCursorImageValue() ? toCSSCursorImageValue(m_value) : 0; }
  62     CSSImageSetValue* cssImageSetValue() const { return m_value->isImageSetValue() ? toCSSImageSetValue(m_value) : 0; }
  63
  64     LayoutSize imageSize(const LayoutObject*, float /*multiplier*/) const override { return LayoutSize(); }
  65     bool imageHasRelativeWidth() const override { return false; }
  66     bool imageHasRelativeHeight() const override { return false; }
  67     void computeIntrinsicDimensions(const LayoutObject*, Length& /* intrinsicWidth */ , Length& /* intrinsicHeight */, FloatSize& /* intrinsicRatio */) override { }
  68     bool usesImageContainerSize() const override { return false; }
  69     void setContainerSizeForLayoutObject(const LayoutObject*, const IntSize&, float) override { }
  70     void addClient(LayoutObject*) override { }
  71     void removeClient(LayoutObject*) override { }
  72     PassRefPtr<Image> image(LayoutObject*, const IntSize&) const override
  73     {
  74         ASSERT_NOT_REACHED();
  75         return nullptr;
  76     }
  77     bool knownToBeOpaque(const LayoutObject*) const override { return false; }
  78
  79     DEFINE_INLINE_VIRTUAL_TRACE()
  80     {
  81         visitor->trace(m_value);
  82         StyleImage::trace(visitor);
  83     }
  84
  85 private:
  86     explicit StylePendingImage(CSSValue* value)
  87         : m_value(value)
  88     {
  89         m_isPendingImage = true;
  90     }
  91
  92     RawPtrWillBeMember<CSSValue> m_value; // Not retained; it owns us.
  93 };
  94
  95 DEFINE_STYLE_IMAGE_TYPE_CASTS(StylePendingImage, isPendingImage());
  96
  97 }
  98 #endif