133 lines
4.3 KiB
C++
133 lines
4.3 KiB
C++
/*
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* Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(TEXT_AUTOSIZING)
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#include "RenderStyle.h"
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#include <wtf/HashMap.h>
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#include <wtf/HashSet.h>
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#include <wtf/RefCounted.h>
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#include <wtf/RefPtr.h>
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namespace WebCore {
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class Document;
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class Text;
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// FIXME: We can probably get rid of this class entirely and use std::unique_ptr<RenderStyle> as key
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// as long as we use the right hash traits.
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class TextAutoSizingKey {
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public:
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TextAutoSizingKey() = default;
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enum DeletedTag { Deleted };
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explicit TextAutoSizingKey(DeletedTag);
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TextAutoSizingKey(const RenderStyle&, unsigned hash);
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const RenderStyle* style() const { ASSERT(!isDeleted()); return m_style.get(); }
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bool isDeleted() const { return HashTraits<std::unique_ptr<RenderStyle>>::isDeletedValue(m_style); }
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unsigned hash() const { return m_hash; }
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private:
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std::unique_ptr<RenderStyle> m_style;
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unsigned m_hash { 0 };
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};
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inline bool operator==(const TextAutoSizingKey& a, const TextAutoSizingKey& b)
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{
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if (a.isDeleted() || b.isDeleted())
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return false;
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if (!a.style() || !b.style())
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return a.style() == b.style();
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return a.style()->equalForTextAutosizing(*b.style());
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}
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struct TextAutoSizingHash {
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static unsigned hash(const TextAutoSizingKey& key) { return key.hash(); }
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static bool equal(const TextAutoSizingKey& a, const TextAutoSizingKey& b) { return a == b; }
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static const bool safeToCompareToEmptyOrDeleted = true;
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};
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struct TextAutoSizingHashTranslator {
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static unsigned hash(const RenderStyle& style)
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{
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return style.hashForTextAutosizing();
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}
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static bool equal(const TextAutoSizingKey& key, const RenderStyle& style)
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{
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if (key.isDeleted() || !key.style())
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return false;
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return key.style()->equalForTextAutosizing(style);
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}
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static void translate(TextAutoSizingKey& key, const RenderStyle& style, unsigned hash)
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{
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key = { style, hash };
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}
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};
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class TextAutoSizingValue {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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TextAutoSizingValue() = default;
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~TextAutoSizingValue();
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void addTextNode(Text&, float size);
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enum class StillHasNodes { No, Yes };
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StillHasNodes adjustTextNodeSizes();
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private:
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void reset();
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HashSet<RefPtr<Text>> m_autoSizedNodes;
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};
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struct TextAutoSizingTraits : HashTraits<TextAutoSizingKey> {
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static const bool emptyValueIsZero = true;
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static void constructDeletedValue(TextAutoSizingKey& slot) { new (NotNull, &slot) TextAutoSizingKey(TextAutoSizingKey::Deleted); }
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static bool isDeletedValue(const TextAutoSizingKey& value) { return value.isDeleted(); }
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};
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class TextAutoSizing {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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TextAutoSizing() = default;
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void addTextNode(Text&, float size);
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void updateRenderTree();
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void reset();
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private:
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HashMap<TextAutoSizingKey, std::unique_ptr<TextAutoSizingValue>, TextAutoSizingHash, TextAutoSizingTraits> m_textNodes;
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};
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} // namespace WebCore
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#endif // ENABLE(TEXT_AUTOSIZING)
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