1 /* 2 * Copyright 2003-2010, Haiku, Inc. 3 * Distributed under the terms of the MIT License. 4 */ 5 #ifndef __WIDTHBUFFER_H 6 #define __WIDTHBUFFER_H 7 8 9 #include <Locker.h> 10 #include <TextView.h> 11 12 #include "TextViewSupportBuffer.h" 13 14 15 class BFont; 16 17 18 namespace BPrivate { 19 20 21 class TextGapBuffer; 22 23 24 struct _width_table_ { 25 BFont font; // corresponding font 26 int32 hashCount; // number of hashed items 27 int32 tableCount; // size of table 28 void* widths; // width table 29 }; 30 31 32 class WidthBuffer : public _BTextViewSupportBuffer_<_width_table_> { 33 public: 34 WidthBuffer(); 35 virtual ~WidthBuffer(); 36 37 float StringWidth(const char* inText, 38 int32 fromOffset, int32 length, 39 const BFont* inStyle); 40 float StringWidth(TextGapBuffer& gapBuffer, 41 int32 fromOffset, int32 length, 42 const BFont* inStyle); 43 44 private: 45 bool FindTable(const BFont* font, int32* outIndex); 46 int32 InsertTable(const BFont* font); 47 48 bool GetEscapement(uint32 value, int32 index, 49 float* escapement); 50 float HashEscapements(const char* chars, 51 int32 numChars, int32 numBytes, 52 int32 tableIndex, const BFont* font); 53 54 static uint32 Hash(uint32); 55 56 private: 57 BLocker fLock; 58 }; 59 60 61 extern WidthBuffer* gWidthBuffer; 62 63 64 } // namespace BPrivate 65 66 67 using BPrivate::WidthBuffer; 68 69 70 #if __GNUC__ < 3 71 //! NetPositive binary compatibility support 72 73 class _BWidthBuffer_ : public _BTextViewSupportBuffer_<BPrivate::_width_table_> { 74 _BWidthBuffer_(); 75 virtual ~_BWidthBuffer_(); 76 }; 77 78 extern 79 _BWidthBuffer_* gCompatibilityWidthBuffer; 80 81 #endif // __GNUC__ < 3 82 83 84 #endif // __WIDTHBUFFER_H 85