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 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 "CSSCursorImageValue.h" 30#include "CSSImageGeneratorValue.h" 31#include "CSSImageValue.h" 32#include "StyleImage.h" 33 34#if ENABLE(CSS_IMAGE_SET) 35#include "CSSImageSetValue.h" 36#endif 37 38namespace WebCore { 39 40// StylePendingImage is a placeholder StyleImage that is entered into the RenderStyle during 41// style resolution, in order to avoid loading images that are not referenced by the final style. 42// They should never exist in a RenderStyle after it has been returned from the style selector. 43 44class StylePendingImage : public StyleImage { 45public: 46 static PassRefPtr<StylePendingImage> create(CSSValue* value) { return adoptRef(new StylePendingImage(value)); } 47 48 CSSImageValue* cssImageValue() const { return m_value && m_value->isImageValue() ? toCSSImageValue(m_value) : nullptr; } 49 CSSImageGeneratorValue* cssImageGeneratorValue() const { return m_value && m_value->isImageGeneratorValue() ? static_cast<CSSImageGeneratorValue*>(m_value) : nullptr; } 50 CSSCursorImageValue* cssCursorImageValue() const { return m_value && m_value->isCursorImageValue() ? toCSSCursorImageValue(m_value) : nullptr; } 51 52#if ENABLE(CSS_IMAGE_SET) 53 CSSImageSetValue* cssImageSetValue() const { return m_value && m_value->isImageSetValue() ? toCSSImageSetValue(m_value) : nullptr; } 54#endif 55 56 void detachFromCSSValue() { m_value = nullptr; } 57 58private: 59 virtual WrappedImagePtr data() const override { return const_cast<StylePendingImage*>(this); } 60 61 virtual PassRefPtr<CSSValue> cssValue() const override { return m_value; } 62 63 virtual FloatSize imageSize(const RenderElement*, float /*multiplier*/) const override { return FloatSize(); } 64 virtual bool imageHasRelativeWidth() const override { return false; } 65 virtual bool imageHasRelativeHeight() const override { return false; } 66 virtual void computeIntrinsicDimensions(const RenderElement*, Length& /* intrinsicWidth */ , Length& /* intrinsicHeight */, FloatSize& /* intrinsicRatio */) { } 67 virtual bool usesImageContainerSize() const override { return false; } 68 virtual void setContainerSizeForRenderer(const RenderElement*, const FloatSize&, float) override { } 69 virtual void addClient(RenderElement*) override { } 70 virtual void removeClient(RenderElement*) override { } 71 72 virtual PassRefPtr<Image> image(RenderElement*, const FloatSize&) const override 73 { 74 ASSERT_NOT_REACHED(); 75 return nullptr; 76 } 77 78 virtual bool knownToBeOpaque(const RenderElement*) const override { return false; } 79 80 StylePendingImage(CSSValue* value) 81 : m_value(value) 82 { 83 m_isPendingImage = true; 84 } 85 86 CSSValue* m_value; // Not retained; it owns us. 87}; 88 89STYLE_IMAGE_TYPE_CASTS(StylePendingImage, StyleImage, isPendingImage) 90 91} 92 93#endif 94