/* * Copyright 2003-2010, Haiku, Inc. * Distributed under the terms of the MIT License. */ #ifndef __WIDTHBUFFER_H #define __WIDTHBUFFER_H #include <Locker.h> #include <TextView.h> #include "TextViewSupportBuffer.h" class BFont; namespace BPrivate { class TextGapBuffer; struct _width_table_ { BFont font; // corresponding font int32 hashCount; // number of hashed items int32 tableCount; // size of table void* widths; // width table }; class WidthBuffer : public _BTextViewSupportBuffer_<_width_table_> { public: WidthBuffer(); virtual ~WidthBuffer(); float StringWidth(const char* inText, int32 fromOffset, int32 length, const BFont* inStyle); float StringWidth(TextGapBuffer& gapBuffer, int32 fromOffset, int32 length, const BFont* inStyle); private: bool FindTable(const BFont* font, int32* outIndex); int32 InsertTable(const BFont* font); bool GetEscapement(uint32 value, int32 index, float* escapement); float HashEscapements(const char* chars, int32 numChars, int32 numBytes, int32 tableIndex, const BFont* font); static uint32 Hash(uint32); private: BLocker fLock; }; extern WidthBuffer* gWidthBuffer; } // namespace BPrivate using BPrivate::WidthBuffer; #if __GNUC__ < 3 //! NetPositive binary compatibility support class _BWidthBuffer_ : public _BTextViewSupportBuffer_<BPrivate::_width_table_> { _BWidthBuffer_(); virtual ~_BWidthBuffer_(); }; extern _BWidthBuffer_* gCompatibilityWidthBuffer; #endif // __GNUC__ < 3 #endif // __WIDTHBUFFER_H