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      1 /*
      2  * Copyright (C) 2011, 2012 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. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef CSSValuePool_h
     27 #define CSSValuePool_h
     28 
     29 #include "CSSPropertyNames.h"
     30 #include "CSSValueKeywords.h"
     31 #include "core/css/CSSInheritedValue.h"
     32 #include "core/css/CSSInitialValue.h"
     33 #include "core/css/CSSPrimitiveValue.h"
     34 #include "wtf/HashMap.h"
     35 #include "wtf/RefPtr.h"
     36 #include "wtf/text/AtomicStringHash.h"
     37 
     38 namespace WebCore {
     39 
     40 class CSSValueList;
     41 
     42 class CSSValuePool {
     43     WTF_MAKE_FAST_ALLOCATED;
     44 public:
     45     PassRefPtr<CSSValueList> createFontFaceValue(const AtomicString&);
     46     PassRefPtr<CSSPrimitiveValue> createFontFamilyValue(const String&);
     47     PassRefPtr<CSSInheritedValue> createInheritedValue() { return m_inheritedValue; }
     48     PassRefPtr<CSSInitialValue> createImplicitInitialValue() { return m_implicitInitialValue; }
     49     PassRefPtr<CSSInitialValue> createExplicitInitialValue() { return m_explicitInitialValue; }
     50     PassRefPtr<CSSPrimitiveValue> createIdentifierValue(CSSValueID identifier);
     51     PassRefPtr<CSSPrimitiveValue> createIdentifierValue(CSSPropertyID identifier);
     52     PassRefPtr<CSSPrimitiveValue> createColorValue(unsigned rgbValue);
     53     PassRefPtr<CSSPrimitiveValue> createValue(double value, CSSPrimitiveValue::UnitTypes);
     54     PassRefPtr<CSSPrimitiveValue> createValue(const String& value, CSSPrimitiveValue::UnitTypes type) { return CSSPrimitiveValue::create(value, type); }
     55     PassRefPtr<CSSPrimitiveValue> createValue(const Length& value, const RenderStyle&);
     56     PassRefPtr<CSSPrimitiveValue> createValue(const Length& value, float zoom) { return CSSPrimitiveValue::create(value, zoom); }
     57     template<typename T> static PassRefPtr<CSSPrimitiveValue> createValue(T value) { return CSSPrimitiveValue::create(value); }
     58 
     59 private:
     60     CSSValuePool();
     61 
     62     RefPtr<CSSInheritedValue> m_inheritedValue;
     63     RefPtr<CSSInitialValue> m_implicitInitialValue;
     64     RefPtr<CSSInitialValue> m_explicitInitialValue;
     65 
     66     RefPtr<CSSPrimitiveValue> m_identifierValueCache[numCSSValueKeywords];
     67 
     68     typedef HashMap<unsigned, RefPtr<CSSPrimitiveValue> > ColorValueCache;
     69     ColorValueCache m_colorValueCache;
     70     RefPtr<CSSPrimitiveValue> m_colorTransparent;
     71     RefPtr<CSSPrimitiveValue> m_colorWhite;
     72     RefPtr<CSSPrimitiveValue> m_colorBlack;
     73 
     74     static const int maximumCacheableIntegerValue = 255;
     75 
     76     RefPtr<CSSPrimitiveValue> m_pixelValueCache[maximumCacheableIntegerValue + 1];
     77     RefPtr<CSSPrimitiveValue> m_percentValueCache[maximumCacheableIntegerValue + 1];
     78     RefPtr<CSSPrimitiveValue> m_numberValueCache[maximumCacheableIntegerValue + 1];
     79 
     80     typedef HashMap<AtomicString, RefPtr<CSSValueList> > FontFaceValueCache;
     81     FontFaceValueCache m_fontFaceValueCache;
     82 
     83     typedef HashMap<String, RefPtr<CSSPrimitiveValue> > FontFamilyValueCache;
     84     FontFamilyValueCache m_fontFamilyValueCache;
     85 
     86     friend CSSValuePool& cssValuePool();
     87 };
     88 
     89 CSSValuePool& cssValuePool();
     90 
     91 }
     92 
     93 #endif
     94