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/*
* Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 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. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
*/
#pragma once
#if ENABLE(TEXT_AUTOSIZING)
#include "RenderStyle.h"
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class Document;
class Text;
// FIXME: We can probably get rid of this class entirely and use std::unique_ptr<RenderStyle> as key
// as long as we use the right hash traits.
class TextAutoSizingKey {
public:
TextAutoSizingKey() = default;
enum DeletedTag { Deleted };
explicit TextAutoSizingKey(DeletedTag);
TextAutoSizingKey(const RenderStyle&, unsigned hash);
const RenderStyle* style() const { ASSERT(!isDeleted()); return m_style.get(); }
bool isDeleted() const { return HashTraits<std::unique_ptr<RenderStyle>>::isDeletedValue(m_style); }
unsigned hash() const { return m_hash; }
private:
std::unique_ptr<RenderStyle> m_style;
unsigned m_hash { 0 };
};
inline bool operator==(const TextAutoSizingKey& a, const TextAutoSizingKey& b)
{
if (a.isDeleted() || b.isDeleted())
return false;
if (!a.style() || !b.style())
return a.style() == b.style();
return a.style()->equalForTextAutosizing(*b.style());
}
struct TextAutoSizingHash {
static unsigned hash(const TextAutoSizingKey& key) { return key.hash(); }
static bool equal(const TextAutoSizingKey& a, const TextAutoSizingKey& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
struct TextAutoSizingHashTranslator {
static unsigned hash(const RenderStyle& style)
{
return style.hashForTextAutosizing();
}
static bool equal(const TextAutoSizingKey& key, const RenderStyle& style)
{
if (key.isDeleted() || !key.style())
return false;
return key.style()->equalForTextAutosizing(style);
}
static void translate(TextAutoSizingKey& key, const RenderStyle& style, unsigned hash)
{
key = { style, hash };
}
};
class TextAutoSizingValue {
WTF_MAKE_TZONE_ALLOCATED(TextAutoSizingValue);
public:
TextAutoSizingValue() = default;
~TextAutoSizingValue();
void addTextNode(Text&, float size);
enum class StillHasNodes : bool { No, Yes };
StillHasNodes adjustTextNodeSizes();
private:
void reset();
UncheckedKeyHashSet<RefPtr<Text>> m_autoSizedNodes;
};
struct TextAutoSizingTraits : HashTraits<TextAutoSizingKey> {
static const bool emptyValueIsZero = true;
static void constructDeletedValue(TextAutoSizingKey& slot) { new (NotNull, &slot) TextAutoSizingKey(TextAutoSizingKey::Deleted); }
static bool isDeletedValue(const TextAutoSizingKey& value) { return value.isDeleted(); }
};
class TextAutoSizing {
WTF_MAKE_TZONE_ALLOCATED(TextAutoSizing);
public:
TextAutoSizing() = default;
void addTextNode(Text&, float size);
void updateRenderTree();
void reset();
private:
UncheckedKeyHashMap<TextAutoSizingKey, std::unique_ptr<TextAutoSizingValue>, TextAutoSizingHash, TextAutoSizingTraits> m_textNodes;
};
} // namespace WebCore
#endif // ENABLE(TEXT_AUTOSIZING)
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