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. 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 VerticalPositionCache_h 27 #define VerticalPositionCache_h 28 29 #include "platform/fonts/FontBaseline.h" 30 #include "wtf/HashMap.h" 31 32 namespace blink { 33 34 class RenderObject; 35 36 // Values for vertical alignment. 37 const int PositionUndefined = 0x80000000; 38 39 class VerticalPositionCache { 40 WTF_MAKE_NONCOPYABLE(VerticalPositionCache); 41 public: VerticalPositionCache()42 VerticalPositionCache() 43 { } 44 get(RenderObject * renderer,FontBaseline baselineType)45 int get(RenderObject* renderer, FontBaseline baselineType) const 46 { 47 const HashMap<RenderObject*, int>& mapToCheck = baselineType == AlphabeticBaseline ? m_alphabeticPositions : m_ideographicPositions; 48 const HashMap<RenderObject*, int>::const_iterator it = mapToCheck.find(renderer); 49 if (it == mapToCheck.end()) 50 return PositionUndefined; 51 return it->value; 52 } 53 set(RenderObject * renderer,FontBaseline baselineType,int position)54 void set(RenderObject* renderer, FontBaseline baselineType, int position) 55 { 56 if (baselineType == AlphabeticBaseline) 57 m_alphabeticPositions.set(renderer, position); 58 else 59 m_ideographicPositions.set(renderer, position); 60 } 61 62 private: 63 HashMap<RenderObject*, int> m_alphabeticPositions; 64 HashMap<RenderObject*, int> m_ideographicPositions; 65 }; 66 67 } // namespace blink 68 69 #endif // VerticalPositionCache_h 70